LED英文资料及中文翻译

First LED Summary
LED (Light Emitting Diode), light-emitting diode, is a solid state semiconductor devices, which can be directly converted into electricity to light. LED is the heart of a semiconductor chip, the chip is attached to one end of a stent, is the negative side, the other end of the power of the cathode, the entire chip package to be epoxy resin. Semiconductor chip is composed of two parts, part of the P-type semiconductor, it inside the hole-dominated, the other side is the N-type semiconductor, here is mainly electronic. But linking the two semiconductors, among them the formation of a "PN junction." When the current through the wires role in this chip, will be pushing e-P, P zone in the hole with electronic composite, and then to be issued in the form of photon energy, and this is the principle of LED luminescence. The wavelength of light that is the color of light, is formed by the PN junction of the decisions of the material. Second LED history and development
50 years ago, people have to understand semiconductor materials can produce light of the basic knowledge, the first commercial diodes in 1960. English is the LED light emitting diode (LED) acronym, and its basic structure is an electroluminescent semiconductor materials, placed in a wire rack, then sealed with epoxy resin around, that is, solid package, Therefore, the protection of the internal batteries can play the role of line, so the seismic performance LED good.
LED is the core of the P-type semiconductor and components of the N-type semiconductor chips, the P-type semiconductor and N-type semiconductor between a transition layer, called the PN junction. In some semiconductor materials in the PN junction, the injection of a small number of carrier-carrier and the majority of the
extra time will be in the form of light energy to release, thus the power to direct conversion of solar energy. PN junction on reverse voltage, a few hard-carrier injection, it is not luminous. This use of injection electroluminescent diodes is produced by the principle of light-emitting diodes, commonly known as LED. When it in a positive state of the work (that is, at both ends with forward voltage), the current flows from the LED anode, cathode, semiconductor crystals on the issue from the ultraviolet to infrared light of different colors, light and the strength of the currents.
Instruments used for the first LED light source instructions, but all kinds of light colored LED lights in traffic and large screen has been widely applied, have a very good economic and social benefits. The 12-inch red traffic lights as an example, is used in the United States have long life, low-efficiency 140 watt incandescent lamp as a light source, it produced 2,000 lumens of white light. The red filter, the loss-90 percent, only 200 lumens of red light. In the light of the new design, Lumileds companies have 18 red LED light source, including the loss of circuit, a total power consumption of 14 watts to generate the same optical effect. Automotive LED lights is also the source of important areas.
For general lighting, people need more white light sources. The 1998 white LED successful development. This is the GaN LED chip and Yttrium Aluminum Garnet (YAG) package together cause. GaN chip of the Blu-ray (λ p = 465nm, Wd = 30nm), made of high-temperature sintering of the Ce3 + YAG phosphors excited by this Blu-ray after irradiating a yellow, the peak 550 nm. Blue-chip installed in the LED-based Wanxing reflection in the cavity, covered with a resin mixed with YAG thin layer, about 200-500 nm. LED-based tablets issued by the Blu-ray absorption
part of the phosphor, the phosphor another part of the Blu-ray and a yellow light mixed, can be a white. Now, the InGaN / YAG white LED, YAG phosphor by changing the chemical composition of the phosphor layer and adjust the thickness of the 3500-10000 K color temperature can be colored white. This blue LED through the method by white, constructed simple, low-cost, high technology is mature, so use the most.
The development of LED display can be divided into the following phases: first phase 1990 to 1995, mainly monochrome and 16 color graphics screen. Used to display text and simple images, mainly used in railway stations, financial securities, banks, post offices and other public places, as public information display tools. The second stage is from 1995 to 1999, there have been 64, 256 level gray-scale two-color video screen. Video control technology, image processing, optical fiber communication technology applications will enhance the LED display to a new level. LED display control LSI chips special at this time developed by domestic companies, and can be applied. The third stage, from 1999, red, pure green, blue LED in bulk into China, while domestic enterprises in-depth research and development work, using red, green, and blue LED production of full-color display has been widely used , poured into sports stadiums, convention centers, squares and other public places, which will bring the domestic large-screen full-color era. With the rapid development of LED materials market, surface mount device is available from 2001, mainly used in indoor full color, and its high brightness, colorful, low temperature characteristics, the point spacing can be adjusted by different price Requirements were accepted, in just two years time, product sales have more than 300 million yuan, surface mount full-color LED display application market entered the new
century. To meet the 2020 Olympic Games, "downsizing" plan, Liard developed a surface mount dual color displays, a lot of time for the training center and game scoring. Full color in Olympic venues, in order to tighten investment, full color way is mostly detachable, live during the Olympic Games as a tool can be used for rental after the event, as the performance of national policies such as public places, tools released by In this way cost recovery as soon as possible. On the market, China's accession to WTO, Beijing's successful Olympic bid and so on, into the development of LED display industry, a new opportunity. Domestic LED display market continues to grow, currently in the domestic market, domestic LED display market share of nearly 95%. LED display the international market capacity is expected to 30% a year growth rate. Currently, LED display manufacturers concentrated primarily in Japan, North America, China LED manufacturers in which the insignificant share of exports. According to incomplete statistics, the world, there are at least 150 manufacturers full color, in which products are complete, the larger company has some 30 or so.
Third LED advantages
Conductor light-emitting diode (LED) as a third-generation semiconductor lighting source. This fantastic product has a lot of advantages: (1) efficient light: spectra of almost all concentrated in the visible light frequency, the efficiency can reach 80% -90%. The luminous efficiency of incandescent visible light efficiency of almost 10% -20% only. (2) high quality of light: not as a result of spectrum UV and infrared, there is no heat, no radiation, is typically a green light illumination. (3) energy consumption of the small: single power generally , through the cluster can be
tailored to meet different needs, and waste very little. As a light source, under the brightness in the same power consumption of only ordinary incandescent
1/8-10. (4) long life: flux attenuation to 70% of the standard life expectancy is 100,000 hours. A semiconductor light can be used under normal circumstances 50 years, even if the long life of the people, life will be used up to two lights. (5) durable and reliable: No tungsten wire, glass and other easily damaged components, non-normal retirement rate is very small, very low maintenance costs. (6) the application of flexibility: small size, can flat pack, easy to develop into a short thin products, make point, line, face various forms of specific applications. (7) Security: working voltage or less in between the current 20-70mA in between. (8) green: recyclable waste, no pollution, unlike fluorescent lamps containing mercury as ingredients. (9) response time is short: to adapt to frequent and high-frequency switching operation of occasions.
Fourth Classification of LED display
1, color by color can be divided into
Single-color display: Single color (red or green).
Two-color display: red and green dual-color, 256 gray scale levels, can display 65,536 colors.
Full-color screen: red, green, blue color, 256 grayscale full color display can display more than 16 million kinds of colors.
2, according to display device classification
LED Digital Display: 7 segment display devices for the digital control code, suitable for production of the clock screen, the interest rate screens, showing the number of electronic display.
LED dot-matrix graphic display: display device is arranged by a number of uniform composition of the dot-matrix LED display modules, suitable for broadcast text,
image information.
LED video display: display devices are formed by a number of light-emitting diodes that can display video, animation and other video files.
3, by using the occasion categories
Indoor Display: LED spots smaller, genera l Φ3mm - Φ8mm, shows the general area of a few to more than ten square meters.
Outdoor Display: dozens of square meters in size to several hundred square meters, high brightness, can work in the sun, with wind, rain, water resistant.
4, classified according to light spot diameter
Indoor screen: Φ3mm, Φ, Φ5mm,
Room external screen: Φ10mm, Φ12mm, Φ16mm, Φ19mm, Φ20mm, Φ21mm, Φ22mm, Φ26mm
Room external screen as the basic unit of light emitting tube, LED tube principle is a set of red, green, and blue light-emitting diode sealed in a plastic barrel and jointly develop
5, Display a static, horizontal scroll, vertical scroll and flip display. One block module control drive 12 (up to control 24) 8X8 Dot Matrix, a total of 16X48 dot matrix (or 32X48 dot matrix), is a single block of MAX7219 (or PS7219, HD7279, ZLG7289 and 8279, and the like LED display driver module) 12 times (or 24 times)! Can use "cascade" approach the composition of any large dot matrix display. Effects, good power consumption, and the MAX7219 circuit than the use of lower cost.
Fifth LED applications
It is a semiconductor light-emitting diode by controlling the display, which
probably look like that from lots of small red lights are usually formed by the bright lights off to show character. Used to display text, graphics, images, animations, quotes, video, video signals and other information on the display screen.
Graphic display and LED display into the video display by the LED matrix blocks. Graphic displays can be synchronized with the computer display Chinese characters, English text and graphics; video display using micro-computer control, graphics, images, and Mao, real-time, synchronization, clear message to the broadcast of a variety of information dissemination, but also shows two dimensional, three-dimensional animation, video, TV, VCD programs and live on. LED display shows the screen brightly colored, three-dimensional sense of strong, static, such as painting, moving as the film is widely used in finance, tax, business, telecommunications, sports, advertising, industrial enterprises, transport, education systems, stations, docks, airports, shopping malls, hospitals, hotels, banks, securities markets, construction market, auction houses, industrial enterprises in management and other public places.
LED display can show changes in the numbers, text, graphics and video; not only can be used in the indoor environment can also be used for outdoor environment, with a projector, TV wall, LCD screen can not match advantage.
Sixth LED screen test method
A look at Screen size, appearance, smoothness, with the screen connection and so on
Second look after the dead pixel screen light up, not in not within the scope of (in general the screen is basically gone now)
Color consistency, display text is normal, display pictures, play full screen full color
to white, red, green, and blue.
一LED概述
LED（Light Emitting Diode），发光二极管，是一种固态的半导体器件，它能够直接把电转化为光。

LED的心脏是一个半导体的晶片，晶片的一端附在一个支架上，一端是负极，另一端连接电源的正极，使整个晶片被环氧树脂封装起来。

半导体晶片由两部份组成，一部份是P型半导体，在它里面空穴占主导地位，另一端是N型半导体，在这边主若是电子。

但这两种半导体连接起来的时候，它们之间就形成一个“P-N结”。

当电流通过导线作用于那个晶片的时候，电子就会被推向P区，在P区里电子跟空穴复合，然后就会以光子的形式发出能量，这确实是LED发光的原理。

而光的波长也确实是光的颜色，是由形成P-N结的材料决定的。

二LED历史及进展现状
50年前人们已经了解半导体材料可产生光线的大体知识，第一个商用二极管产生于1960年。

LED是英文light emitting diode（发光二极管）的缩写，它的大体结构是一块电致发光的半导体材料，置于一个有引线的架子上，然后周围用环氧树脂密封，即固体封装，因此能起到爱惜内部芯线的作用，因此LED 的抗震性能好。

发光二极管的核心部份是由P型半导体和N型半导体组成的晶片，在P型半导体和N型半导体之间有一个过渡层，称为P-N结。

在某些半导体材料的PN结中，注入的少数载流子与多数载流子复合时会把多余的能量以光的形式释放出来，从而把电能直接转换为光能。

PN结施加反向电压时，少数载流子难以注入，故不发光。

这种利用注入式电致发光原理制作的二极管叫发光二极管，通称LED。

当它处于正向工作状态时（即两头加上正向电压），电流从LED阳极流向阴极时，半导体晶体就发出从紫外到红外不同颜色的光线，光的强弱与电流有关。

最初LED用作仪器仪表的指示光源，后来各类光色的LED在交通信号灯和大面积显示屏中取得了普遍应用，产生了专门好的经济效益和社会效益。

以12英寸的红色交通信号灯为例，在美国本来是采纳长寿命、低光效的140瓦白炽灯作为光源，它产生2000流明的白光。

经红色滤光片后，光损失90%，只剩下200流明的红光。

而在新设计的灯中，Lumileds公司采纳了18个红色LED 光源，包括电路损失在内，共耗电14瓦，即可产生一样的光效。

汽车信号灯也是LED光源应用的重要领域。

关于一样照明而言，人们更需要白色的光源。

1998年白光的LED开发成功。

这种LED是将GaN芯片和钇铝石榴石（YAG）封装在一路做成。

GaN芯片发蓝光（λp=465nm，Wd=30nm），高温烧结制成的含Ce3+的YAG荧光粉受此蓝光激发后发出黄色光射，峰值550nm。

蓝光LED基片安装在碗形反射腔中，覆盖以混有YAG的树脂薄层，约200-500nm。

LED基片发出的蓝光部份被荧光粉吸收，另一部份蓝光与荧光粉发出的黄光混合，能够取得得白光。

此刻，关于InGaN/YAG白色LED，通过改变YAG荧光粉的化学组成和调剂荧光粉层的厚度，能够取得色温3500-10000K的各色白光。

这种通过蓝光LED取得白光的方式，构造简单、本钱低廉、技术成熟度高，因此运用最多。

LED显示屏的进展可分为以下几个时期：第一时期为1990年到1995年，主若是单色和16级双色图文屏。

用于显示文字和简单图片，要紧用在车站、金融、、邮局等公布场合，作为公共信息显示工具。

第二时期是1995年到1999年，显现了64级、256级灰度的双基色视频屏。

视频操纵技术、图像处置技术、光纤通信技术等的应用将LED显示屏提升到了一个新的台阶。

LED显示屏操纵专用大规模集成电路芯片也在此刻由国内企业开发出来并得以应用。

第三时期从1999年开始，红、纯绿、纯蓝LED管大量涌入中国，同时国内企业进行了深切的研发工作，利用红、绿、蓝三原色LED生产的全彩色显示屏被普遍应用，大量进入运动场馆、会展中心、广场等公布场合，从而将国内的大屏幕带入全彩时期。

随着LED原材料市场的迅猛进展，表面贴装器件从2001年面世，要紧用在室内全彩屏，而且以其亮度高、色彩鲜艳、温度低的特性，可随意调整的点间距，被不同价位需求者所同意，在短短两年多时刻内，产品销售额已超过3亿元，表面贴装全彩色LED显示屏应用市场进入新世纪。

为了适应2020年奥运会的“瘦身”打算，利亚德开发了表面贴装双基色显示屏，大量用于训练馆和竞赛计时计分系统。

在奥运场馆全彩屏方面，为紧缩投资，全彩屏大部份采纳可拆卸方式，奥运期间可作为实况转播工具，赛事终止后可用于租赁，作为演出、国家政策发布等公共场合应用工具，通过这种方式可尽快收回本钱。

就市场而言，中国加入、北京申奥成功等，成为LED显示屏产业进展的新契机。

国内LED显示屏市场维持持续增加，目前在国内市场上，国产LED显示屏的市场占有率近95%。

国际上LED显示屏的市场容量估量以每一年30%的速度在增加。

目前，LED显示屏的要紧制造厂商集中在日本、北美等地，我国LED制造厂商出口的份额在其中微乎其微。

据不完全统计，世界上目前至少有150家厂商生产全彩屏，其中产品齐全，规模较大的公司约有30家左右。

三LED优势
导体发光二极管(LED)作为第三代半导体照明光源。

这种产品具有很多梦幻般优势：(1)光效率高：光谱几乎全数集中于可见光频率，效率能够达到80%-90%。

而光效差不多的白炽灯可见光效率仅为10%-20%。

(2)光线质量高：由于光谱中没有紫外线和红外线，故没有热量，没有辐射，属于典型的绿色照明光源。

(3)能耗小：单体功率一样在，通过集群方式能够量文体衣地知足不同的需要，浪费很少。

以其作为光源，在一样亮度下耗电量仅为一般白炽灯的1/8-10。

(4)寿命长：光通量衰减到70%的标准寿命是10万小时。

一个半导体灯正常情形下能够利用50年，即便长寿百岁的人，一生最多也就用2只灯。

(5)靠得住耐用：没有钨丝、玻壳等容易损坏的部件，非正常报废率很小，爱惜费用极为低廉。

(6)应用灵活：体积小，能够平面封装，易开发成轻薄短小的产品，做成点、线、面各类形式的具体应用产品。

(7)平安：单位工作电压大致在之间，工作电流在20-70mA之间。

(8)绿色环保：废弃物可回收，没有污染，不像荧光灯一样含有汞成份。

(9)响应时刻短：适应频繁开关和高频运作的场合
四LED显示屏的分类
1、按颜色基色可以分为
单基色显示屏:单一颜色（红色或绿色）。

双基色显示屏：红和绿双基色，256级灰度、能够显示65536种颜色。

全彩色显示屏：红、绿、蓝三基色，256级灰度的全彩色显示屏能够显示一千六百多万种颜色。

2、按显示器件分类
LED数码显示屏：显示器件为7段码数码管，适于制作时钟屏、利率屏等，显示数字的电子显示屏。

LED点阵图文显示屏：显示器件是由许多均匀排列的发光二极管组成的点阵显示模块，适于播放文字、图像信息。

LED视频显示屏：显示器件是由许多发光二极管组成，能够显示视频、动画等各类视频文件。

3、按使用场合分类
室内显示屏：发光点较小，一样Φ3mm--Φ8mm，显示面积一样几至十几平方米。

室外显示屏：面积一样几十平方米至几百平方米，亮度高，可在阳光下工作，具有防风、防雨、防水功能。

4、按发光点直径分类
室内屏：Φ3mm、Φ、Φ5mm、
室外屏：Φ10mm、Φ12mm、Φ16mm、Φ19mm、Φ20mm、Φ21mm、Φ22mm、Φ26mm
室外屏发光的大体单元为发光筒，发光筒的原理是将一组红、绿、蓝发光二极管封在一个塑料筒内一路发
5、显示方式有静态、横向滚动、垂直滚动和翻页显示等。

单块模块控制驱动12块（最多可控制24块）8X8点阵，共16X48点阵（或32X48点阵），是单块MAX7219（或PS7219、HD7279、ZLG7289及8279等类似LED显示驱动模块）的12倍（或24倍）！可采用“级联”的方式组成任意点阵大显示屏。

显示效果好，功耗小，且比采用MAX7219电路的成本更低。

五LED 应用范围
LED是一种通过操纵半导体发光二极管的显示方式，其可能的样子确实是由很多个一样是红色的小灯组成，靠灯的亮灭来显示字符。

用来显示文字、图形、图像、动画、行情、视频、录像信号等各类信息的显示屏幕。

LED显示屏分为图文显示屏和视频显示屏，均由LED矩阵块组成。

图文显示屏可与运算机同步显示汉字、英文文本和图形；视频显示屏采纳微型运算机进行操纵，图文、图像并茂，以实时、同步、清楚的信息传播方式播放各类信息，还可显示二维、三维动画、录像、电视、VCD节目和现场实况。

LED显示屏显示画面色彩鲜艳，立体感强，静如油画，动如电影，普遍应用于金融、税务、工商、邮电、体育、广告、厂矿企业、交通运输、教育系统、车站、码头、机场、商场、医院、宾馆、银行、证券市场、建筑市场、拍卖行、工业企业治理和其它公布场合。

LED显示屏能够显示转变的数字、文字、图形图像；不仅能够用于室内环境还能够用于室外环境，具有投影仪、电视墙、液晶显示屏无法比拟的优势。

六LED 显示屏查验方式
一看屏体规格，外观，平整度，屏内的连线等
二看屏点亮后坏点，在不在不范围之内，（一样来讲此刻的屏大体上没有了）色差一致性，显示文字是否正常，显示屏图片等，全彩的要全屏打白色，红，绿，蓝。

技术优势评述。