美国大学转学录取率能够帮助学生更好地把握美国转学趋势并且提前确定好想要转学的梦校。对于很多不满意自己学校排名，或者想从社大转学到加州大学、纽约大学等排名靠前的学生而言，美国大学转学是实现弯道超车的重要捷径。那今天小编就和大家一起来深入了解美国大学转学录取率。

加州大学依旧强势

说起美国大学转学录取率，就不得不提加州大学系统。作为对转学生十分友好的一个学校系统，加州大学的九所学校都接受学生的转学申请。而且以加州大学洛杉矶分校为例，本科新生直接申请的录取率是16%，而转学的录取率竟然达到了26%。另外，加州大学的TAG转学保录协议也很受学生欢迎。只要在大学前两年的学习中保持高GPA，并且修满转学所需要的课程学分，就可以直接转学加州大学圣塔芭芭拉分校、尔湾分校、戴维斯分校等名校。

而加州大学系统也是非常欢迎社区大学的学生进行转学，具有相当高的优先级。美国大学前两年实行通识教育，学生们通过修读英语、数学、人文科学、社会科学等课程，获取足够的转学学分后，就能递交申请。当然，加州大学转学除了看重学生们的硬性条件外，软性条件如课外背景提升活动、社团经历、志愿者活动都是录取的重要考量因素。近年来，随着转学人数的不断增加，加州大学的转学录取率也有收紧下降趋势。因此，对于有志冲击加州大学名校的同学而言，一定要提前做好准备规划，让自己赢在起跑线上。

东部大学大有崛起之势

东部大学如弗吉尼亚大学、波士顿大学等大学以超过40%的美国大学转学录取率受到了很大的关注。而传统名校如纽约大学、波士顿学院等依旧保持着20%以上的转学录取率。美国每年有250万学生进行转学，但同学们在进行学校和专业选择时，也应该注意竞争的激烈程度，最大化选择和安排适合自己的转学计划，注重冲刺梦校的同时，也要选择自己比较有把握的学校。美国求真教育成立于2007年，拥有超过12年的转学辅导经验，目前已经帮助上千名学生成功转入自己心仪学校。不论你是想要冲刺排名更高的学校，或者是想通过社大这一跳板实现华丽转身，求真美国大学转学服务都会是你不二的选择。

https://cdn.indeededu.com/uploads/2020/01/run-80x80.jpg 80w, https://cdn.indeededu.com/uploads/2020/01/run-36x36.jpg 36w, https://cdn.indeededu.com/uploads/2020/01/run-180x180.jpg 180w, https://cdn.indeededu.com/uploads/2020/01/run-120x120.jpg 120w, https://cdn.indeededu.com/uploads/2020/01/run-450x452.jpg 450w, https://cdn.indeededu.com/uploads/2020/01/run.jpg 552w" data-sizes="(max-width: 298px) 100vw, 298px" sizes="(max-width: 298px) 100vw, 298px" srcset="https://cdn.indeededu.com/uploads/2020/01/run-298x300.jpg 298w, https://cdn.indeededu.com/uploads/2020/01/run-80x80.jpg 80w, https://cdn.indeededu.com/uploads/2020/01/run-36x36.jpg 36w, https://cdn.indeededu.com/uploads/2020/01/run-180x180.jpg 180w, https://cdn.indeededu.com/uploads/2020/01/run-120x120.jpg 120w, https://cdn.indeededu.com/uploads/2020/01/run-450x452.jpg 450w, https://cdn.indeededu.com/uploads/2020/01/run.jpg 552w" /> 图源：freepik

机会总是留给有准备、有雄心的人

美国大学转学是一个准备时间长、准备材料复杂以及需要提前规划的过程。很多同学虽然有了明确的方向及目标，但对每所学校的要求不了解，而且不会正确合理地选择自己的课程。求真教育了解到很多同学对加州大学洛杉矶分校和伯克利分校都特别感兴趣，但自己连基本的转学课程要求都不了解，甚至缺乏了转学最基本的英语课和数学课。

另外，很多同学在选完课后以为可以通过期末考试挽回自己平时因为贪玩而早退迟到失去的分数，殊不知赔了夫人又折兵。尽管好几个晚上通宵复习，希望临时抱佛脚，但最终无补于事，好几门课拿到了F的成绩，这无疑会对之后的转学有极大的影响。正确排课是成功转学的第一步。打个比方，如果学生对工商管理专业感兴趣，却在大一大二选了许多数据统计课程，这无疑会增加学生的压力，消磨学生的自信心，并且不利于之后换取课程学分。

在正确选课之后，我们需要在平时把自己的GPA保持好，并且适当地在日常学习和课外活动中锻炼自己的领导力、团队合作能力以及创造力。这样我们才能更好地为之后的文书提供优秀素材，以及在填写网申时更好地向招生官展现多面的自己。值得注意的是，美国大学规定本科GPA不能低于2.0，否则将面临停学、开除的处分。因此，大家在平时一定要踏踏实实地把自己的成绩提高，不能存有侥幸心理。

求真寄语

美国大学转学录取率能够帮助学生更好地了解一所学校对转学生的欢迎程度。想要了解完整的榜单可以咨询你身边的求真老师，我们将在第一时间为你提供最有用的转学小贴士，让你事半功倍。求真专业咨询、规划、申请以及文书团队，也会全程保障，助你实现名校转学梦想。

加州大学转学

作为世界上最好的公立大学系统，加州大学深受许多中国留学生的喜爱。近年来，越来越多家长和学生避开竞争激烈的直升区，选择加州大学转学，从而实现从社区大学逆袭加州名校的梦想。今天，求真老师将带大家来了解一下社区大学转学加州大学的一些事儿。

TAG——加州大学转学的重要角色

TAG全称Transfer Admission Guarantee，是六所加州大学和加州社区大学达成的转学保证录取协议。学生只要在加州社区大学里的表现达到指定的学术要求，包括GPA和转学学分要求，就可以保证被六所加州大学录取。目前，接受TAG的加州大学有加州大学圣塔芭芭拉分校（UC Santa Barbara）、加州大学欧文分校（UC Irvine）、加州大学戴维斯分校（UC Davis）、加州大学圣克鲁兹分校（UC Santa Cruz）、加州大学河滨分校（UC Riverside）和加州大学默塞德分校（UC Merced）。由此看来，对于目标转学院校为以上六所加州大学的同学来说，大学前两年选择了在加州社区大学就读，就相当于一只脚已经踏入了梦校。

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加州大学转学成功的几大要素

TAG对于想从加州社区大学转学加州大学的同学来说，无疑是个利好的协议。然而，加州大学洛杉矶分校（UC Los Angeles）、加州大学伯克利分校（UC Berkeley）和加州大学圣地亚哥分校（UC San Diego）这三所学校目前并不接受TAG。这就意味着，如果同学们的梦校为这三所学校，就非常有必要提前做好加州大学转学规划。求真老师为大家总结了成功转学不可或缺的三大因素：

第一，重视课程选择，保持优秀GPA。加州大学转学要求学生必须完成学期制60个学分或者学季制90个学分，一般还要求学生完成包含英语、数学课在内的七门基础课程，且最低成绩在C以上。此外，加州大学对转学生的GPA有最低要求。因此，科学合理的课程规划以及出彩的GPA是助力你成功转学加州大学的重要前提。

第二，提交出彩的文书，给招生官留下深刻的印象。申请加州大学转学时，学生需要从网申系统给出的八个文书题目中选择其中四个来回答。文书对于塑造申请者的整体形象至关重要，优秀的文书能突出申请者优势，吸引招生官的眼球。

第三，高质量完成课外活动表。课外活动表是UC网申中最重要的一部分，能帮助申请者向招生官展现自身活动经历。高质量的课外活动表能凸显申请者的核心能力，帮助其给招生官留下深刻的印象。

加州大学转学成功的几大要素

对于有意通过转学进入加州名校的同学来说，求真教育的建议是：制定合理科学的申请规划，预留足够多的时间去调整课程安排、进行个人活动背景提升、构思润色转学文书。求真专家团队深谙美国转学体制，十余年来已成功帮助上千名学子实现从社区大学到加州名校的华丽转身。

美国留学申请

美国留学申请 怎么做，你有详细的时间规划吗？虽说留学申请季明年9月份才正式开始，但准备工作必须得提前开展。收下这份详细合理的美国留学申请时间规划表，各位准留学党就能不慌不忙把名校offer揽入怀中。

美国留学申请 规划早，入读名校阻碍少

1月-3月

1. 选择学校：选校需谨慎，我们要考虑很多因素，比如地点、学费、声誉、规模、多样性等。最重要的，当然还有学校和专业排名，这方面同学们可以参考U.S. News和QS发布的美国大学排行，如果你拿不定主意，可以来咨询留学专家求真教育。

2. 标准化考试：美国留学申请的必备条件之一就是标化成绩，一般包括雅思（现在大多数美国大学都认可雅思成绩）/托福、SAT、SATII；申请研究生则需要提交托福、GRE（对申请理工科学生而言）或者GMAT成绩（对申请商科学生而言），具体要根据申请的学校和专业来定。取得理想的标化成绩是取得名校offer的重要一步。求真小编在此温馨提示：一定要提早规划，提前报名。

4月-6月

3. 自我提高：准备美国留学申请时，GPA成绩也是一个比较重要的环节，所以在校期间同学们要尽可能提高自己的GPA成绩。如果自己的标化考试成绩不理想，也可以在这段时间刷分。

另外，想要后期文书内容丰富，增强个人软性实力也十分关键。个人软实力的增强则依靠活动的规划。活动类型包括社团类、科研类、竞赛类、实习等等，能持续性、层次性地锻炼个人的综合能力。求真小编提醒：背景活动要注重质量和深度，而不是一味追求数量。

7月-8月

4.证明材料准备：对于申请美国本科生的同学来说，一般需要提供高中的成绩单。而申请研究生的同学则需要提交本科四年的成绩单。需要注意的是，部分院校的研究生项目还会要求申请者提供相应实习证明。材料准备是一个繁杂的过程，这个过程中肯定会遇到这样那样的问题。求真团队可以协助同学们进行资料准备，保证资料的完整和及时。

5.文书创作：需要准备的文书主要包括个人简历、个人陈述、小论文和推荐信。个人简历要有很强的针对性，需要能体现申请人的需要和申请目的。根据不同的美国大学要求，申请者需要提供1-5篇不等的个人陈述，推荐信则一般需要2-3封。

小编建议：最好5月份就开始文书构思，7月份前就沟通确认好至少2个学校推荐人，为7、8月专心写个人陈述和小论文留出足够时间。文书是同学们向招生官展示个人软实力的重要途径。优秀的申请文书能给招生官留下深刻的印象，增加录取成功率。求真专业团队可以提供全程一对一指导，拒绝流水线文书创作，为同学们打造最完美的文书。

9月-第二年2月

6.正式开始申请：9月正式进入美国留学申请季。要注意的是，不同学校的申请截止日期都有所不同，即使是同一所学校不同专业的也会不一样。同学们应密切关注目标院校的截止日期，切勿错过了申请时机。

另外，有一些网申小贴士要告诉大家：有固定统一截止日期的美国院校一般都是在截止日期之后才进行材料审核，即是说，无论提交早晚，都不会影响录取几率的。但一些院校的截止日期是分轮次的，比如哈佛的MBA截止日期就分3轮：第一轮9月9号，第二轮1月6号，第三轮4月4号。通常，第一轮的录取率最高。因此，建议同学们第一轮就提交申请。

https://cdn.indeededu.com/uploads/2020/01/books-768x512.jpg 768w, https://cdn.indeededu.com/uploads/2020/01/books-705x470.jpg 705w, https://cdn.indeededu.com/uploads/2020/01/books-450x300.jpg 450w, https://cdn.indeededu.com/uploads/2020/01/books.jpg 832w" data-sizes="(max-width: 300px) 100vw, 300px" sizes="(max-width: 300px) 100vw, 300px" srcset="https://cdn.indeededu.com/uploads/2020/01/books-300x200.jpg 300w, https://cdn.indeededu.com/uploads/2020/01/books-768x512.jpg 768w, https://cdn.indeededu.com/uploads/2020/01/books-705x470.jpg 705w, https://cdn.indeededu.com/uploads/2020/01/books-450x300.jpg 450w, https://cdn.indeededu.com/uploads/2020/01/books.jpg 832w" /> 图源：Freepik

第二年3月-5月

7.后续工作：提交网申后，同学们可能会收到部分学校的面试通知，因此一定要时常跟进申请状态，避免错失面试机会。小编在这里提醒申请者要尽早进行模拟面试练习，提高自己的通过率。另外，可以及时向学校更新自己的标化成绩。如果一直没有收到院校的通知消息，同学们要及时发邮件询问院校自己的录取结果。

8.获得录取通知：如果同时收到多所院校的录取通知，同学们应该多方衡量后选择最适合自己的院校。

第二年6月-7月

9.签证申请：赴美留学需要先获得F-1签证。签证流程包括准备签证材料、预约签证。美国教育机构会给每位收到offer的F-1签证申请人提供申请签证所需的批准文件I-20。一定要核对文件上的信息是否正确，如果有误就要及时联系学校进行修改。

10.入学待办事项：录取院校的学生后台一般会给出一份新生入学的待办事项清单，同学们及时查阅学生邮箱，获取清单。要认真阅读清单，在截止日期前完成上面的内容。一般来说，入学待办事项会包括寄送原校成绩单、完成疫苗要求、提交经济保单证明等等。

一切就绪，同学们只要收拾好自己的行囊和心情就可以漂洋过海，开始自己的留学生活！

求真寄语

一场留学，一次抉择，一生改变。小编希望这份详细的时间规划表能对各位准留学党有所帮助。求真教育自2007年成立以来，已经帮助超过五千名学子实现留学名校梦。从前期咨询到后期申请，求真教育提供最贴心的一站式服务，助你取得名校offer。文章来源：https://indeededu.com/application-usa/

The bubble bag is mainly made of high-pressure polyethylene bubble film through film cutting process, the bubble film is cut to the size required for bag making, and then the bag is made by a bubble film special bag making machine (hot baking hot cutting bag making machine). Bubble bags are mainly used for logistics and transportation protection of electronic product buffer packaging, plastic products, metal products, ceramic products, glass products and other products that need buffer protection. Bubble film is made of high-pressure low-density polyethylene. It is a transparent flexible packaging material currently widely used and has a wide range of applications.

The principle is that the film contains air to form air bubbles to prevent the product from impacting, ensuring that the product plays a protective role when it is shaken, and also has the function of heat insulation. It is suitable for different product packaging or turnover in various industries. Because the middle layer of the air cushion film is filled with air, it is light and elastic, and has the properties of sound insulation, shock resistance and wear resistance. It is waterproof, moisture-proof, and pressure-resistant.

There are two types of bubble bags: single-sided and double-sided. Single-sided bubble bags are suitable for protecting lighter products. Double-sided bubble bags have strong shock resistance and are suitable for larger and heavier items. Single and double-sided bubble bags are suitable for packaging of products in various industries such as bag making and slicing. Single and double-sided bubble bags can be equipped with anti-static bubble bags, as well as different colors and printing. It can also be compounded with other materials to increase protection and beauty.

According to different tissues, bubble bags are classified as: Kraft paper bubble bag, pearl film bubble bag, aluminized platinum bubble bag, transparent bubble bag (there are two layers and three layers).

According to different materials, bubble bags are classified as: Ordinary bubble bag, anti-static bubble bag, static conductive bubble bag.

According to the structure, bubble bags are classified as: Bare airbag, kraft paper airbag, other material airbag.

Bubble mailers are mainly used for postal packaging of products. Shock-absorbing bubble film is included in the bubble bag. There are countless small bubbles in the bubble film, so it is light and flexible, and has the functions of sound insulation, shock resistance, and scratch resistance. It is widely used in shock-resistant cushioning, protective packaging in electronics, meters, ceramics, crafts, household appliances, auto dealers, kitchens, furniture, hardware tools, glass products and precision instruments. It can prevent the objects from being squeezed, shaken, and rubbed during the transfer process, and has a certain protective effect on items that are afraid of being squeezed and pressed. In addition, by adding different additives to the raw materials, various special bubble bags such as anti-static can also be manufactured. Anti-static air cushion bag is used to pack electronic components and components, such as integrated circuit boards, cards, etc., which can prevent static electricity and also play a role of buffering and shockproof.

As one of the tamper proof bags manufacturers, our company has shown its worth in this very competitive sector due to theefforts and rigorous inputs from the professionals who have contributed immensely to its growth. These people have a very vast knowledge of the market trends and scenario allowing them gets reliable link-ups with vendors for us. Also, we have some of the best-qualified quality and packaging experts, who have taken responsibility to ensure we make zero-defect products as well as safe and on-timedelivery of the packaging materials.

As a professional pu sandwich panel machine China  , This polyurethane sandwich panel machine made up of un-coiler machine, roll forming system, High pressure foaming system, mobile injector system, Double belt laminates system, Cut-off system, Auto stacking and package system, Advanced remote interaction and centralized control system and all the necessary components non-indicated which can constitute a innovating and high efficiency continuous production line.Pu sandwich panel production line  is widely used in building steel structure workshop, cold storage room, steel villa, housing, supermarkets, air duct, public places.

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Decking creating time of year in many parts of the country is quick and fairly sweet, which means that composite decking contractors have to optimize effectiveness and lower job-website time. Put simply, complete tasks more quickly.

Listed below are 6 methods for getting more composite deck jobs completed in 2019 and much more funds in the before the period ends.

1. Install Capped Composite Decking

Contractors who choose capped high profile composite decking for his or her clients can full careers faster because when the decking is connected to the structural framing, there’ s no need to return within the job. Say goodbye to time wasted waiting around for the elements to cooperate for sanding and discoloration. The hard-outside shell of most capped composites also enables crew members simply to walk over the deck surface with little worry of harm.

Some composite decking suppliers such as Oakio go a step further by wrapping a protective movie around each board. Right after the last decking element is put in, builders can easily remove the film and expose a beautifully unmarred surface for the home owner.

2. Use Color Matched up End Caps Instead of Image Framing

Before, home owners have typically opted to “picture frame” their decks, since they experienced hardly any other option. This required contractors to install additional joists and supports to basically hide the ‘butt ends’ of the structure in a way that was also structurally sound.

Although successful, image framing the perimeter of any deck costs time, labour and components – especially on custom made composite deck installation that include many perspectives and/or numerous ranges. Nowadays, composite companies provide shade-matched up end caps that easily and quickly connect to the cut comes to an end of every deck panel. This is not just much more economical for the customer, in addition, it provides for a simpler, better framing system to become put in under.

3. Cable television Rails Are Faster & More Appealing for Clientele Than Balusters. Pre-Drilled Rail Posts Make the Job Faster.

For any more modern day, streamlined look, property owners have opted to put in cable tv rails instead of standard balusters. While the result may be virtually unobstructed sights for that home owner, the precise dimensions needed to get every single hole drilled at your location could be a time-consuming, neurological wracking challenge for deck building contractors. Rather, go for railing techniques that offer articles with pre-drilled openings. That way, your crew can confidently (and quickly) install composite articles and string the cable connections as simply as lacing up a footwear.

4. Use a Concealed Fastening Method

Can there be anything at all more tedious and time-consuming than including plugs to pay for the screw heads of literally hundreds of fasteners used on a job? Why not make 2019 the entire year that you simply start using a hidden fastening method as an alternative? Not only can the outcome supply property owners with a clear, uniformed surface, deck building contractors will be able to complete the installation in two enough time, as well.

Combined with the streamlined look, some hidden fastening techniques provide additional, time conserving advantages for decking benefits. As an example, the Step-Clip program from Oakio is made to not only attach quickly and easily to your framing joist, additionally, it provides a accurate, uniformed area between each composite deck board. This reduces the requirement to put in plugs and pre-spaces boards in a manner that indicates to reduce put in occasions up to 50% – for both knowledgeable building contractors and novice DIYers.

5. Produce A Plan with Customers In Advance

As they say, “an ounce of elimination may be worth a pound of cure.”  It can’t be stressed enough how essential it is to get as many specifics as you can resolved using the customer before building of the new composite deck starts. Carefully introducing, analyzing and documenting elements of the project with home owners beforehand will help steer clear of expensive and time-eating miscues once work begins. An excellent pre-construction program also permits builders to pre-purchase supplies and synchronize shipping and delivery in a way that is best.

6. Purchase Pre-Reduce, Custom-Size Boards for Large Work.

Determining twice and slicing once is traditionally the way that all craftsmen steer clear of making blunders. Although a powerful approach, this process can be time-consuming. Especially when you add inside the time for you to walk backwards and forwards from the measurement area to the cut site.

Instead, wise deck builders save time by partnering with reliable suppliers and vendors to accomplish the measuring and slicing on their behalf. This turns into a crucial element to completing large composite decking installations faster as well as makes developing several decks (to get a new subdivision community or condo connection) a breeze, too. Oakio delivers the service to companies, at no extra cost, on orders of 200 composite decking boards or even more.

With regards to deck creating, particularly in a area with short periods, the key to success is discovering and incorporating new methods into your business to minimize squander, save time, improve high quality and make more money. Hopefully these pointers will help you put in composite decking faster and easier, as well as for your organization to finish more tasks inside the forthcoming calendar year.

Sinowa SNW-HCG/5-300, not only a cost-effective product and core equipment but also a representative product for PU sandwich panel line, is born under the introduction and digestion of foreign first-class technology. It can work with 2-5components material of PU /PIR. This machine adopts the most leading technology, high-end configuration, so it embraces the following characteristics: multifunction; high automation; accurate measurement, humanized operation; safety device design. All these characteristics ensure the stable function and accurate sprues, which lead to a comprehensive quality and cost performance.

Multi- Components High Pressure Foaming Machine

SNW-HCG/5-300, not only a cost-effective product and core equipment but a representative product as well, is born under the introduction and digestion of foreign first-class technology. It can work with 2-5components material of PU /PIR. This machine adopts the most leading technology, high-end configuration, so it embraces the following characteristics: multifunction; high automation; accurate measurement, humanized operation; safety device design. All these characteristics ensure the stable function and accurate sprues, which lead to a comprehensive quality and cost performance.

Machine including

1. Feeding system

The host of the system is configurated by 6 double layer steel tanks. it is equipped with hot and cold water machine for insulation or heating to ensure the foaming process of raw materials at a constant temperature.

2. Output and measurement system

Polyester high-pressure measurement and resin are the core elements of the foaming machine. Whether the adjustment of measurement and pressure is accurate and stable is the key step to the quality of the products. Sinowa import Italia company high-pressure axial piston pump with high quality and reliability to make the system accurate, stable operation, simple maintenance and intuitive operation.

3. Security protection system

The safety protection system of SNW-HCG/9 type polyurethane high-pressure foaming machine is reliability. Equipment operation and safety are the primary guarantees of Sinowa's design and multiple protection settings are set to achieve the protection function.

E-mail us for more details about low pressure foaming machine.

Micro LED、Mini LED、COB、GOB、TOPCOB... what is the specific meaning of this dazzling string of letter names? How to distinguish? And which of these emerging new terms represents the birth of innovative technology or is it the bluff market hype of businessmen?

The popularity of small spacing LED technology in the commercial market has greatly encouraged the research and development of manufacturers, and has given birth to the continuous emergence of many innovative technologies and products. At the same time, a variety of new terms come one after another. And the promotion of each new term is an endorsement or evidence of the significance of the change of the product. It seems that it has a great name, and this technology has epoch-making significance.

In fact, the realization of every revolutionary innovative technology and product is difficult to achieve overnight. It requires a hard and long exploration process, during which there will be some transitional intermediate technology and products. As far as these intermediate technologies and products are concerned, they also have certain progressive significance. However, sometimes businesses exaggerate their propaganda and consciously pack various terms, which results in market disruption and misleading.

This paper will start from a simple chart to clarify the meaning of various nouns, technical origins, and innovative gold content.

The following table, starting from three basic elements, evaluates and classifies products with small spacing. The three elements are:

1. Chip size
2. Point spacing
3. Technical route

Using these three basic elements, we can accurately measure the technical content of a product.

Noun: Micro LED

Definition: chip size is less than 50um

Micro LED is a hot word which appears with high frequency. Generally speaking, the current industry recognized standard is that it can be called micro LED technology when the chip size of the display screen is less than 50um. At present, the conventional chip size of small spacing LED display is more than 100um. Therefore, in order to challenge the existing technology, Micro LEDs are also more strictly defined as chips smaller than 20um or 30um.

When the chip size is below 50um, the pixel spacing is also defined in the order of micrometer. For example, when the pixel density of the mobile phone is 432ppi, the pixel spacing is 118um * 118um (μ m).

At present, Micro LED technology is still in the research and development stage. In addition to the micro chip technology, how to transfer a large number of micro chips to the circuit board is the biggest technical bottleneck of Micro LED at present. However, there is no doubt that the breakthrough in this field is a new technology with epoch-making significance.

Noun: Mini LED

Narrow meaning: chip size is 50-100um

Generalized meaning: the distance between points is less than P1.0

Mini led was first proposed by LED Display manufacturer. And the micro LED technology will take a long time to be realized. At the same time, for our large screen display, in most application scenarios, pixel density does not need to reach micron level. Therefore, compared with Micro LED, Mini LED has larger chip size and is easier to realize technically.

At first, mini led was defined strictly. The chip size was between 50-100 um. This chip of this size can only be realized by flip chip technology. It should be said that the initial definition of Mini LED has a great breakthrough in technology.

However, with the increasing heat of micro spacing LED, domestic display industry manufacturers call the display screen with a point spacing of less than 1.0mm the Mini LED due to the need of market promotion of “heat”. This kind of appellation is easy to be confused. Because the traditional surface mount package can also be used to achieve P1.0 or below, the n-in-1 package can also be used, and the positive chip COB package can also be used, and of course, the inverted cob can also be used.. Therefore, many of the display screens known as mini led, which have not made a breakthrough in chip technology, are still widely used in small spacing LED display chips.

For example, the N-in-One integrated packaging introduced by some domestic packaging factories still uses chips larger than 100um, and the packaging technology route is SMD surface mount packaging technology. It is a set of 1R1G1B chips, which are originally packaged in a single package, and integrated into 4 groups, 6 groups or 9 groups, etc. It should be said that N-in-One is an exploration of the extension and improvement of traditional SMD packaging technology. It's not to say a technology update.

Noun: COB

Qualitative: intergenerational change of packaging technology route

Highlight: the minimum distance between inverted cob points can reach P0.1

COB is the abbreviation of CHIP ON BOARD, which is an innovation of the existing SMD packaging mode, and also can be called the transformation of SMD small spacing led.

COB packaging is to put the chip direct to the solid-state welding line on the PCB board, and then protect it by glue coating technology. In SMD mode, the solid crystal, the solid crystal, welding wire and dispensing of the chip are packaged into an independent lamp bead, which is then pasted and welded on the PCB through the surface.. The two packaging structures are shown in the figure below:

COB package completely abandons SMD bracket or base plate, and the structure is more concise. At the same time, because there are no exposed welding feet and not affected by the external environment, it greatly improves the sealing of the entire display structure. Therefore, COB packaging can greatly improve the reliability and stability of small spacing led. At the same time, COB technology can also achieve smaller spacing and lower material cost, which is a subversion of traditional SMD.

At present, COB can be divided into two types: positive chip cob and flip chip cob.

The minimum distance between points that can be achieved by the positive COB is p0.5. The flip COB can also remove the wires between the chip and the substrate shown in the figure above. Flip cob can further reduce the point spacing to P0.1.

One of the most representative products of the flip cob is the CLEDIS display screen displayed by Sony at major exhibitions, and the other is the p0.84 point pitch thewall display screen launched by Samsung. It can be said that in a period of time of the future, the flip cob represents the direction of the development of small spacing led.

Noun: GOB

Qualitative analysis: modified SMD with small space

GOB is the abbreviation of GLUE ON BOARD. It is to apply a whole layer of glue on the surface of display module of SMD to improve the sealing of SMD. It is an improvement of SMD surface mount.

It should be said that GOB is a kind of technological improvement of display manufacturers, which improves the performance of moisture-proof, water-proof and anti-collision of display screen. And to a certain extent, it makes up for the lack of reliability and stability of small spacing display screen. However, this technical scheme puts forward a very high requirement for SMD surface sticking process. Once there is a faulty welding, it is difficult to repair. In addition, it also needs time to verify whether the colloid will change color, degumme and affect heat dissipation during long-term use.

Noun: TOPCOB

Qualitative analysis: modified SMD with small space

This product, called TOPCOB, has nothing to do with COB what we usually call. It still adopts the current SMD surface mount package and then the module surface is covered with glue, which is completely consistent with the gob technology mentioned above. It is a patch to the technical defects of surface mount, which is hard to be called a revolutionary intergenerational product.

In addition to the above mentioned terms, there are many new terms that have emerged or are emerging in the industry. To judge and measure these technologies and products, we need rational analysis. From chip technology, packaging technology to the final display production and assembly, what level does the new technology update take place at? Is it an improvement of traditional technology or an update? Only by deeply analyzing the causes of technology can we not be misled by the exaggerated market propaganda of the businessmen. I hope this article will be helpful to your objective evaluation.

One that just happens to be found in your own yard. Here are some ideas that will help you select furnishings and backyard components that will add practical design to your new composite deck room, period after period, every year.

Pick fitments which fit the inside style of your home. Take the time to look at the decoration you’ve added to the rooms in your home. Utilize this as being a design guide for choosing backyard home furniture and components. From modern to nation, city to earthy, you will find types of garden furniture made to complement virtually every kind of internal decoration.

The same as your decking – select home furniture that’s effortless to look after. You set up a whole new composite deck so that you will could spend more time relaxing and much less time attempting to keep it looking fantastic. Exactly the same principle needs to be placed on the furniture and fittings you place on your deck. From substantial-quality, corrosion-totally free aluminium to effortless-to-thoroughly clean composites, reduced upkeep outdoor furniture is a smart, cost-effective method of getting probably the most pleasure from your deck. Another plus of composite furnishings, like Adirondack Seating, is they will also be more unlikely to damage the composite decking underneath them.

Work with an outside carpet to body the room making it truly feel comfortable. It might appear counter easy-to-use in the beginning, but complementing your stunning new Brazilian Cherry, Garapa Gray or Gold Teak composite deck with an exceptional outside region carpet can certainly help tie up together the appearance of an outside living space. You will find numerous backyard carpets produced from either organic fiber materials or synthetic blends made from reused plastics to pick from.

Generally speaking, all-natural fiber carpets tend to be comfortable underfoot, but are a lot more susceptible to fading, mildew and mildew development. The simplest way to choose the right outside carpeting for your deck is to take the time and ‘test-drive’ several man made and organic dietary fiber options to find out which truly feel right. Remember that a rubberized-backed rug can help avoid sliding, and think about staying away from difficult material-guaranteed carpets that may potentially mar the surface of the deck. Then, weigh out the pros and cons of each and every option. Styles, colors and patterns are all around, so you’re sure to obtain the one which fits your flavor.

Select top quality interior or backyard cushions and seat pillows. Tables and chairs add functionality for your outside living area. Cushions and pillows put an component of both design and comfort that makes you need to invest even more time exterior. Much like outside home furniture, material and manufacturing advances during the last a long period have created a great deal of great, durable items. Most synthetic, polyester-dependent chair cushioning and pillow material coverings are immune to heat, mildew, humidity and sunshine causing them to be extremely long lasting and simple to clean up.

It’s essential to point out that while backyard pillows are resistant against the elements, they are not impervious to the long-term effects of sunshine, snow and rainwater. When not being used, retail store these things indoors or safeguard these with a UV resistant water-proof cover to avoid harm.

Use safety addresses on furniture bases to prevent scratching. As they say, it’s often the little things that issue most. Even the best home furniture for any composite deck can sometimes trigger unpredicted damage if their bases have razor-sharp, jagged sides. Home owners can steer clear of causing unpleasant scrapes on the decking by adding affordable defensive cushioning to the bottom of all outdoor furniture.

Garden furniture foot patches are usually made from packed, heavy-duty textiles such as noticed or various types of plastics. A multitude of styles, from slides,caps and glasses, inserts or noticed-patches make sure that homeowners can easily find the size and shape to complement any kind of garden furniture or item. Products are either connected via adhesives or screwed to the thighs and legs of garden furniture, allowing it to glide on the area of decking without marring.

As the good quality, powerful, polypro composite decking fire rating from Oakio comes with a coextruded, capped surface to safeguard it from daily wear, including furniture feet patches is a simple and inexpensive way to additional make sure the surface remains scuff-totally free.

Store furniture indoors during winter. Until you are fortunate enough to reside in a environment that allows you to appreciate outdoor residing all year long, there will come a time when you will need to retail store your outdoor furniture. While most wood composites, metallic and vinyl mesh components are designed to stand up to modest weather conditions easily, cold temps and severe winter snow, winds and ice cubes may take its toll on even the most well-produced products.

When the time concerns transfer yourself indoors, it’s smart to perform the very same for your backyard residing home furniture, as well. Simply storing furniture within a storage space lose or garage, from dampness, can dramatically enhance the long life of these products. Additionally, if the weather heats up backup once more, everything will be dried out, prepared and clean to travel.

Highway guardrail roll forming machine can produce a variety of guardrails which is Mostly used in highway Road. highway guardrail forming machine are all of the high quality, Durability, Long lasting Life and they are also easy to be installed. One production Machine can produce products of a wide range of specifications, so you will surely get profile a lot.

Highway Guard rail machine is produced by the high-quality material, which made by the cold bending process. they use for the way and the bridge, and their features are Sturdy, general, beautiful, easy to install and so on. Highway Guardrail roll forming machine is one of the Iconic products by Sinowa. Sinowa design and manufacture concentrated reflected the research and development level, who have the high-speed and the cost-effective machine, and all products quality and stability located at the forefront of the world.

highway guardrail machine is produced by the high-quality material, and the thickness in normal from 2.0mm to 4.0mm, which made by cold bending roll forming machine. They use for the way and the bridge ,and their features are sturdy, general, beautiful, easy to install and so on . Highway Guardrail roll forming machine is one of the Iconic products by Sinowa.Sinowa guard rail machine has the high-speed and the stability, and guardrail products quality located in the forefront of the world.

1. Generation Mechanism of Static Electricity

In general, static electricity is generated by friction or induction.

Friction static electricity is caused by the movement of electric charge in the process of contact friction or separation of two objects. The static electricity left by the friction between the conductors is usually relatively weak, which is due to the strong conductivity of the conductor. The ions generated by the friction will move together and neutralize quickly in the friction process and at the end. After the insulator is rubbed, it may produce high electrostatic voltage, but the charge is very small. This is due to the physical structure of the insulator itself. In the molecular structure of insulator, it is very difficult for electrons to move freely away from the binding of atomic nucleus, so only a small amount of molecules or atoms can be ionized as a result of friction. 

Induced static electricity is an electric field formed by the movement of electrons in an object under the action of electromagnetic field. Generally, induced static electricity can only be generated on the conductor. The effect of space electromagnetic field on insulator can be ignored. 

2. Electrostatic Discharge Mechanism

The 220V city electricity can kill people, but people can't kill people with thousands of volts on the body. What's the reason? The voltage at both ends of the capacitor meets the following formula: U=Q/C. According to this formula, when the capacitance is very small, a small amount of charge will produce a high voltage. Generally, the capacitance of our body and objects around us is very small. When we generate electric charge, a small amount of electric charge will also generate a high voltage. Due to the small amount of charge, when discharging, the current formed is very small, the time is very short, the voltage can not be maintained, and the very short time will be reduced. As the human body is not an insulator, the static charges accumulated in all parts of the body will be collected when there is a discharge path, so it feels like that the current is larger and there is a sense of electric shock. After static electricity is generated in conductors such as human body and metal objects, the discharge current will be relatively large.

For materials with good insulation performance, one is that the amount of charge generated is very small. On the other hand, the generated charge is difficult to flow. Although the voltage is high, only the charge at the contact point and a small area nearby can flow and discharge when there is a discharge path somewhere, while the charge at the noncontact point cannot discharge (because it is insulator). Therefore, even if there are tens of thousands of volts, the discharge energy is very small. It is shown in Figure 8. 

Therefore, although the static voltage of plastic turnover box, packaging foam and chemical fiber carpet is very high, the discharge energy is very small. 

3. Electrostatic Hazards to Electronic Components

Static electricity will do harm to LED. It's not the only "patent" of LED, but also the common diode and triode made of silicon materials. Even buildings, trees and animals can be damaged by static electricity.

So, how does static electricity damage electronic components? I don't want to say something irrelevant, and just talk about semiconductor devices, and it's limited to diode, triode, IC, LED. 

The damage of electricity to semiconductor components is ultimately the participation of current. Under the action of current, the device is damaged by heat. To have current, there must be voltage. However, the semiconductor diode has a PN junction. Whether it is forward or reverse, the PN junction will have a voltage range of blocking current. The forward barrier is low, while the reverse barrier is much higher. In a circuit, where the resistance is high, the voltage is concentrated. However, when the voltage is applied forward to the LED and the external voltage is less than the threshold voltage of the diode (the size corresponds to the material band gap width), there is no forward current, and the voltage is all applied to the PN junction. When the voltage is applied to the LED in reverse direction and the external voltage is less than the reverse breakdown voltage of the LED, the voltage is all applied to the PN junction. At this time, there is no voltage drop at the false soldering point of the LED, the bracket, the p-area and the n-area, because there is no current. When the PN junction breaks down, the external voltage will be shared by all the resistors on the circuit. Where the resistance is large, the voltage borne by which part is high. As far as LEDs are concerned, it is natural that the PN junction bears most of the voltage. The thermal power generated on the PN junction is the voltage drop on it multiplied by the current value. If the current value is not limited, too much heat will burn the PN junction, and the PN junction will lose its function and pass through.

Why is the IC afraid of static electricity? Because the area of each component in the IC is very small, and the parasitic capacitance of each component is very small (often the circuit function requires the parasitic capacitance to be very small). Therefore, a small amount of electrostatic charge will produce a high electrostatic voltage, and the power tolerance of each component is usually very small, so the electrostatic discharge will easily damage the IC. But ordinary discrete components, such as ordinary small power diodes and small power triodes, are not very afraid of static electricity, because their chip area is relatively large, and their parasitic capacitance is also relatively large, so it is not easy for general statics to accumulate high voltage on them. Due to the thin gate oxide and small parasitic capacitance, low-power MOS transistors are easy to be damaged by static electricity. Usually, they leave the factory after three electrodes are short circuited after packaging. In use, it is often required to remove the short route after welding. However, due to the large chip area of high-power MOS tubes, general static electricity will not damage them. So you will see that the three electrodes of the power MOS tube now have no short circuit protection (the early manufacturers still short them before leaving the factory).

Led actually has a diode in fact. Its area is very large compared with each component in IC. So the parasitic capacitance of LED is relatively large. Therefore, in general, static electricity can not damage the LED.

In general, the static electricity, especially the static electricity generated on the insulator, will have a high voltage, but the discharge charge is very small, and the duration of the discharge current is very short. However, the voltage of the static electricity induced on the conductor may not be very high, but the discharge current may be very large, and it is often a continuous current. This is very harmful to electronic components. 

4. Why does Static Electricity Damage LED infrequently?

Let's first look at an experimental phenomenon. There is a piece of metal iron plate having 500V static electricity. Put the LED on the metal plate (pay attention to the method of putting to avoid the following problems). Do you think the LED will be damaged? Here, if the LED is to be damaged, it should usually be added with a voltage greater than its breakdown voltage, that is, the two electrodes of the LED should contact the metal plate at the same time and have a voltage greater than the breakdown voltage. As the iron plate is a good conductor, the induced voltage is equal everywhere on it. The so-called 500V voltage is relative to the ground, so there is no voltage between the two electrodes of LED, so naturally there will be no damage. Unless you touch one electrode of the led to the iron plate, the other electrode connects to the ground or other conductors with conductors (hands or conductors without insulating gloves).

The above test results indicate that when LED is in electrostatic field, one electrode must contact with the electrostatic body, and the other electrode must contact with the ground or other conductors are damaged. In actual production and application, with the small volume of LED, there is little chance of such things, especially in batch. An accident is possible. For example, the LED is on the electrostatic body, and one electrode contacts the electrostatic body, and the other electrode is just suspended. At this time, someone touches the suspended electrode, which may damage the LED.

The above phenomenon tells us that the electrostatic problem can not be ignored. Electrostatic discharge is to have a conductive circuit, and there is no electrostatic damage. When only a small amount of leakage occurs, the problem of accidental electrostatic damage can be considered. If it happens in large quantities, it is more likely to be a problem of chip contamination or stress. The LED Display manufacturer can addressing these issues.

As a sub-company of DesignLED Technology (HK) Co., Limited, Viewpointec Technology Co., Limited has always been proud of what its parent company achieved in the past decade. Located in Guangdong, China, with a headquarter in the US and business center in Guangdong, China, Viewpointec has started up in 2018, upholding the principle-- keep advancing LED technology and innovative LED solutions-- of DesignLED. We engage in designing, manufacturing, and providing a one-stop service for clients around the world, with value-added services.

Faith has the connecting power into the spiritual realm,which links us with God and makes Him become a reality to the perceptions of a person.

In Hebrews 11:1 says FAITH is the substance of things we hoped for,the evidence of things not seen.

There were moments of our lives that we are tempted to be afraid,when we saw those news on TV, the radio broadcast about updating something,your face book news feeds telling you to be afraid and you are starting to give in.

So here are some important points on shifting fear into faith:

1.Change your mindset

Sometimes what you processed in your mind becomes what you believe until it dictate your actions and you become limited. In Romans 12:2 says "Be transformed by the renewing of your mind".

Therefore if we have a renewed mind everyday then our lives will be transformed and our fear will eventually turn into faith.

2. Change your declaration 

What you declare is what you become because your tongue has a power either  life or death (Proverbs 18:21)so choose to declare life,declare positive,declare the promises of God with boldness and faith.

3.Change your focus

What's your B.A.E? (before anything else) In Mathew 6:33 it says "Seek first the Kingdom of God. To whom you spend your time the most? Do you still have more time on meditating the word of God than scrolling on face book?Let us reflect ourselves,maybe its the right time to change our focus.

Many householder struggle with to prove the cost of composite decking is reasonable. Averaging between $7.00-$11.00per square meter, the cost of installing a high-quality composite decking will certainly be higher than building with traditional timber decking, which can cost between $ 5 - $7 per board. However, simply comparing the material and installation costs alone doesn’t mean everything. After 2-3 years of routine maintenance, the cost difference between traditional timber decking and WPC decking is easily erased. We all know that no one wants to spned more time and cost for the maintenance. There are several other accessories that contribute to the total cost of purchasing any product. It’s in there hidden costs that buying a higher priced - yet higher quality - item starts to make sense.

Purchasing a high-quality, credible used car with $8,000 may looked inadvisable and hilarious. After all, a quick search online will undoubtedly reveal dozens of cars that are already on sale for $1,000 or less. If “Car is a car” then why some people would spend $8,000 to buy the car which is much higher than those they search on the Int

Actually, we have to consider the two things: comparing the long term value and the total cost of ownership of both purchases. Substantially, all of them can be used to measure the total amount of time and money that someone will spend on something while they own it. The same principles can be applied to compare the cost of WPC composite decking and traditional timber decking. Initially, the cost of installing a timber decking will be lower, but in order to keep the timber decking looking and performing as new, it will need near constant attention and maintenance. And, there is definitely a cost to completing all that work. No matter if you choose to do the work by yourself or hire someone.

For all wood decking, even wood that has been treated with preservatives, is still easy to be damage by moisture. As an organic material, it’s naturally absorbent, meaning that water will not only adhere to a wood surface, it can also seep into it. This can cause problems as minor as surface mold and mildew growth to structural damage caused by rot. To prevent such situation, lumber decking has to be sealed with paint or stain every few years, which costs money. As you can see, after 2-3 years, the additional expense of maintaining a low-cost traditional timber decking starts to encroach on what a high quality wpc composite decking would have cost. With none of the mess or headaches to deal with either, composite decking require only sweeping and a quick wash with soap and water between seasons.

When householders understand what the true costs of spending less to build a timber decking, the benefits of WPC decking have been reveal. Once installed, WPC composite decking require minimal maintenance to keep them looking as new.

As Oakio WPC decking made to look and feel like real wood, homeowners can simply focus all o their attention on the outdoor living with their family, but not wasting time to worry about what’s happening to their new deck. For many people, the peace of mind that comes with choosing to install a composite decking is not only a specific cost, but a gift year after year.

Double layer forming machine for sale can roll form two different roofing profiles without changing anything because it has two layers.E-mail us for double layer roll forming machine price. Upper and lower can roll form different profiles. Besides, the sea freight for import is saved by 50%. It is a popular choice for both new entrepreneurs and established metal building manufacturers.

The roof and wall roll forming machine developed and manufactured by Sinowa is highly cost-effective. on our products to excel our counterparts and taking the leading in terms of quality and efficiency. The roll forming machine is user-friendly in terms of design, manufacture, marketing, and training. We are already the best but are still trying to accomplish for a higher goal.

The metal roof panel machine developed and manufactured by Sinowa company, and the roof roll forming machine is highly cost-effective. on our roofing sheet roll forming machine to excel our counterparts ，and taking the leader in terms of quality and efficiency. The roof roll forming machine is user-friendly by my clients all over the world. We are already the best in roof roll forming machine, but Sinowa is still trying to accomplish for the higher goal in roof roll forming machine.no matter in design, manufacture, marketing or training.

Double Layer Roof  Roll forming machine working process

Typical Products

Specifications of double layer roof roll forming machine

1 Color Consistency of LED Full Color Display Screen

Led full-color display is a new type of indoor and outdoor large-scale electronic communication media, which has the characteristics of large-scale, good environmental adaptability, high brightness, dynamic play, etc., and is unique in the field of indoor and outdoor large-scale electronic communication media. With the further improvement of cost performance, it is widely used in advertising, stage, signboard, transportation facilities, public places and other fields. In recent years of Spring Festival Gala, led full-color display screen is used as background and decoration. The stage design of the 2008 Spring Festival Gala, especially from the main scenes such as the front background, the side background and the ceiling background, uses a large number of LED full-color display screen, which makes the stage beautiful and the atmosphere first-class. The application of stage is only one of the applications of LED full-color display, and LED full-color display is entering into various application fields at an unprecedented speed.

2 Performance parameters of LED full color display

In recent years, China has become the manufacturing center of the global LED full-color display screen, and the technical quality level has been continuously improved. With the improvement of technical level, users and manufacturers have higher and higher requirements for various performance parameters of LED full-color display screen. About 70% of all performance parameters of LED full-color display depend on the performance parameters of LED devices. Therefore, LED devices become the most important key component of LED full-color display. Enhancing the understanding of the performance parameters of LED devices and selecting high-quality LED devices play an important and decisive role in improving the performance parameters of LED full-color display screen. The influence of LED device parameters on the performance parameters of LED full color display are shown in the following.

There are dozens of performance parameters of LED full-color display screen, including nearly 20 key parameters. The following describes the parameters of LED devices and the corresponding performance parameters of LED full-color display screen one by one.

(1) Brightness

Brightness is the basic index of LED full color display. In the industry, it is generally believed that the outdoor display screen should be no less than 5000nits, and the indoor display screen should be no less than 1000nits. The brightness of the whole screen depends on the superposition of the brightness values of the red, green and blue LEDs that make up each pixel. The brightness values of the red, green and blue are approximately in the proportion of 3:6:1. Set different current values of red, green and blue based on the factory nominal value of device current to achieve the above proportion. For example: 1800 MCD for green tube, 900 MCD for red tube and 300 MCD for blue tube of outdoor P20 full color display screen. The brightness of each pixel point is 3000 mmcd, and the maximum brightness of the whole screen is 7500nits which is the result of 2500 points plus 3000 mcd. Finally, the brightness required in the specification can be achieved by adjusting the current value. For the brightness, it is not the higher the better, and appropriateness is enough.

(2) wavelength

Led full-color display is composed of red, green and blue LEDs. Each color is measured by wavelength. The color of the display is closely related to this wavelength. The average wavelengths of red, green and blue LEDs determine the dynamic color gamut range of LED full-color display. Generally speaking, the wavelength of red LED is about 625nm, green is about 525nm and blue is about 470nm. LED full color display of high quality should have a wide range of color gamut.

(3) Consistency

①   Brightness Consistency

The brightness consistency of LED full-color display depends on the brightness consistency of LED devices. Generally, it is required that the maximum and minimum luminance ratio of each color of LED device shall not be higher than 1.3, and then the luminance difference between two adjacent LEDs of the same color shall be less than 10% according to the scientific PCB lamp insertion mode.

②   Chromaticity Consistency

The LED devices that make up the LED full-color display screen all need a certain wavelength range. If the wavelength range is too wide, it will affect the color consistency of the display screen. Generally speaking, the wavelength range of red, green and blue is required to be within 5nm.

③   Angle Consistency

Led full-color display screen is composed of LED devices with angles. The consistency of angles of LED devices will seriously affect the consistency of brightness and chroma of different angles of display screen. The consistency of red, green and blue brightness curves of LED devices (especially elliptical lights) with the change of viewing angle also seriously affects the consistency of brightness and chromaticity of different angles of the display screen. Among all the parameters of full-color display screen, this parameter is the most difficult to achieve. The difference of high-grade led full-color display is mainly due to this.

(4) Power Consumption

LED is a very energy-saving light-emitting device. The power consumption of LED devices determines the power consumption of LED full-color display. Taking P20 full-color outdoor display as an example, its average power consumption is about 250W per square meter in the video playing state. For some 24-hour broadcast advertisers, because of the large area and long playing time, power consumption is an indicator of their concern. Led with higher brightness can be used to make the display, so low current can be used. Generally speaking, the nominal brightness of red, green and blue LEDs is increased by 20%, and the power consumption of the display screen will be reduced by 15% when the brightness of the display screen remains unchanged.

(5) Perspective

The perspective of LED full-color display depends on the perspective of LED devices. At present, most of the outdoor display screens use elliptical led with horizontal viewing angle of 100 ° and vertical viewing angle of 50 °, while the indoor display screens use chip LED with horizontal and vertical viewing angle of 120 ° because of its particularity. The display screens on highways generally use circular led with viewing angle of 30°. Some high-rise display screens require high vertical viewing angle. The angle of view and brightness are contradictory to each other. Large angle of view will inevitably reduce the brightness. The choice of perspective needs to be determined according to the specific purpose.

(6) Failure Rate

An important index of LED full-color display screen is the blind spot rate of LED, which is completely determined by the quality of LED devices (excluding the influence of faulty welding, missing welding and poor contact in the production process of display screen). Before leaving the factory, LED devices shall be subject to various sampling tests, including normal temperature lighting, high temperature and humidity, cold and heat shock and other series tests, to ensure the stability, consistency and continuity of products. Generally speaking, the failure rate of high-quality LED devices for full-color display screen in 1000 hours should be less than 1 in 10000.

(7) Attenuation Characteristics

After working for a long time, the LED full-color display screen will appear the phenomenon that the brightness drops and the color of the LED screen is inconsistent, which is mainly caused by the brightness decay of LED devices. The attenuation of LED brightness will reduce the brightness of the whole screen. The inconsistent attenuation amplitude of red, green, blue LED brightness will cause LED display color inconsistency, that is the phenomenon of the blurred display what we often say. LED device with high quality can control the brightness attenuation amplitude well. According to the standard of lighting 20mA at room temperature for 1000 hours, the red attenuation should be less than 2%, and the blue and green attenuation should be less than 10%. Therefore, the blue and green LEDs should not use 20mA current as much as possible when designing the display screen, and it is better to use only 70% to 80% of the rated current.

Besides the related characteristics of the red, green and blue LEDs, the attenuation characteristics are affected by the current used, PCB heat dissipation design, and the ambient temperature of the display screen.

(8) Size

The size of LED device affects the pixel distance of LED full-color display screen, that is, the resolution. The oval lamp of 5mm is mainly used for outdoor display screen above p16, The oval lamp of 3mm is mainly used for outdoor display screen of p12.5, p12 and P10, and 3528 patch LED is mainly used for indoor display screen of P6 and P8, and 5050 patch LED is mainly used for semi outdoor display screen such as p16 and p12.5. On the premise of constant point spacing, the size of LED devices increases, which can increase the display area and reduce the particle sense. However, due to the decrease of black area, it will reduce the contrast; on the contrary, the size of LED decreases, which reduces the display area, increases the particle sense, the black area and the contrast.

(9) Life Expectancy

The theoretical life of LED device is one hundred thousand hours, which is much longer than the working life of other parts of LED full color display screen. Therefore, as long as the quality of LED device is guaranteed, the working current is appropriate, the PCB heat dissipation design is reasonable, and the production process of display screen is rigorous, LED device will be one of the most durable parts in the display screen.

LED device is the most important component of LED full-color display screen. Its performance parameters play a decisive role in the performance parameters of the display screen, and its cost also accounts for half of the total cost of the display screen. It is very necessary for the design and manufacture of display screen to select, use and understand the influence of LED devices on display screen parameters, especially for high-quality LED full-color display screen. At present, the domestic LED industry is developing rapidly. The technology level of LED used in full-color display screen is comparable to that of foreign brands, and the price is appropriate. It has been widely used in the 2008 Olympic Games project and other major projects, and its performance is not bad, which will promote the transformation of China from a large LED display manufacturing country to a strong LED display manufacturing country.

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Introduction

These hardcover certificate holders are vegan, eco-friendly, thick and sturdy, they can protect your diploma, certificate or award the perfect place to display your achievements. Each red pu certificate cover has a striking satin finish leatherette exterior, with 3mm of foam padding to protect the precious contents, also 4mm foam padding is available for added touching. The folder opens to reveal double velvet panel in red to further highlight your documents or diplomas. The unique middle stripe satin ribbon will add elegance to your covers. And the pocket on the right panel allows double documents to be secured by the textured PU leather. No matter you need a graduation certificate holders, or a marriage certificate holder, it is available in 6"  x 8" , 7"  x 9" , 8" x10" ,8 1/2" x 11"  and 11" x14" sizes, or with a custom-made size. Choose your size based on the measurements of your diploma for a precise fit. Each piece arrives ready to use in a protective acetate sleeve.

LED Gray Level of LED Display

Led gray level can also be called LED brightness. Gray level, also known as half tone, is mainly used to transfer pictures. There are three ways to transfer pictures: level 16, level 32 and level 64. It uses matrix processing to process the pixels of files into level 16, level 32 and level 64, so that the transferred pictures are clearer. Whether it is monochrome, bicolor or tricolor screen, in order to display image or animation, it is necessary to adjust the gray level of each LED light-emitting pixel, and the fine level of adjustment is what we usually call gray level.

Two Ways to Control the Gray Level of LED

One is to change the current flowing, the other is pulse width modulation. 1. Change the current flowing through the LED. Generally, the continuous working current of LED tube is about 20mA. Except for the saturation of red LED, the gray level of other LEDs is basically proportional to the current flowing through them. Another method is to use the visual inertia of human eyes to realize the gray level control by means of pulse width modulation, i.e. to periodically change the light pulse width (i.e. duty cycle). As long as the cycle of repeated lighting is short enough (i.e. refresh frequency rate is high enough), the human eye can't feel the flicker of the luminous pixels. Because pulse width modulation is more suitable for digital control, it is widely used in computer to provide LED display content today, and almost all LED screen use pulse width modulation to control the gray level. LED control system is usually composed of three parts: main control box, scanning board and display control device.

The main control box obtains the luminance data of one screen pixel from the display card of the computer, and then redistributes it to several scanning boards. Each scanning board is responsible for controlling several rows (columns) on the LED screen, and the display and control signals of each row (column) are transmitted in serial mode.

Two Ways of Serial Transmission of Display Control Signals

1. One is to control the gray level of each pixel point on the scanning board. The scanning board decomposes the gray value of each row of pixels from the control box (i.e. pulse width modulation), and then transmits the opening signal of each row of LED in the form of pulse (lit to 1, not lit to 0) to the corresponding LED in line serial mode to control whether it is lit. In this way, fewer devices are used, but the amount of serial transmission data is large, because each pixel needs 16 pulses under 16 levels of gray, and 256 pulses are needed under 256 levels of gray in a cycle of repeated lighting. Because of the limitation of device working frequency, generally only 16 levels of gray can be achieved for LED screen.
2. One is pulse width modulation. The scanning board serial transmission content is not each LED switch signal but an 8-bit binary gray value. Each LED has its own pulse width modulator to control the lighting time. In this way, in a period of repeated illumination, only four pulses are needed for each pixel at 16 levels of gray, and only eight pulses are needed at 256 levels of gray, which greatly reduces the serial transmission frequency. The method of distributed control of LED gray level can easily realize 256 level gray level control.

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