第1个回答 2009-04-23
The LED display panel (LED) : LED emitting diode, one is the abbreviation of light emitting diode, referred to as leds. It is a kind of through control of semiconductor emitting diode display mode, its appearance is probably by many a red light is usually composed by the bright lights, destroyed to display character. Used to display text, graphics, animation, market, image and video, video signal etc all kinds of information of the display screen.
The LED display screen and video display into the text by LED matrix blocks. Graphic display can be displayed with computer, English, Chinese text and graphics, Video screen using microcomputer control, graphic, image, with real-time, synchronization, clear information dissemination way play all kinds of information, but also shows 2d, 3d animation, videos, TV, VCD programs and live. The LED display screen display bright colors, stereo sense is strong, such as oil, such as films, widely used in finance, taxation, industry and commerce, telecommunications, sports, advertising, corporations, transportation, education system, station, port, airport, hospital, shopping malls, hotels, Banks, securities market, market, and construction management of industrial enterprises, Christie's and other public places.
The LED display can display the change of digital image; text, graphics, Not only can be used for indoor environment can also be used in outdoor environment, projectors, LCD TV wall, and the incomparable advantages.
LED by the wide attention and rapid development, and it is the advantages of itself. These advantages in is: high brightness, working voltage, low consumption, miniaturization, impact resistance and long service life and stable performance. LED the development prospect, is currently towards a higher brightness, higher resistance to climate, higher and higher light shine density evenness, reliability, the direction of development. Full-color
The classification of the LED display
1, the color can be divided into gezer
The single color display: single colors (red or green).
Double colors: red and green screen, double colors gray, can show 256 levels 65536 colors.
Full-color display: red, green, and blue, gray level 256 gezer full-color display screen can show more than 1,600 colors.
2, according to the classification of display devices
LED digital display: display device for seven yards, suitable for making the clock display screen, interest rates, digital electronic display screen.
Pictures of LED dot matrix LCD display device is composed of many: evenly composed of light emitting diode matrix display module, suitable for broadcast text, images of information.
LED video display: display device is composed by many light-emitting diodes, video, animation shows various video files.
3, by using occasions classification
Indoor display: light point is lesser, general Φ 3mm - Φ 8mm, display area of general several ten square meters to.
Outdoor screen area to several hundred square meters general dozens, high brightness, can work under the sun, in the wind, rain, waterproof function.
4 points, according to the classification of light in diameter
Indoor screens: Φ 3mm, Φ 3.75 mm, Φ 5mm,
Outdoor screen: Φ 10mm, Φ 12mm and Φ 16mm Φ, 19mm, Φ 20mm, Φ 21mm, Φ 22mm, Φ 26mm
The basic unit of the light outdoor screen for led light cone tube, the principle is a group of red, green, and blue light emitting diode sealed in a plastic tube in common
5. Display horizontally scrolling, static, vertical scroll and flip shows, etc. Single block module control drive 12 (maximum control and block), 16X48 matrix 8X8 matrix (or 32X48 matrix), is a single block of MAX7219 (or PS7219, HD7279, ZLG7289 8279 and other similar LED display driver module) 12 times (or 24 times)! Can use "cascade" means any bitmap big screen composed. Show good effect, low consumption, and the cost of using MAX7219 circuit is lower.
The LED display inspection method,
See appearance, specifications, screen body flatness, screen the attachment within
2 look bad, after the light screen is not in scope, the screen (generally now basically no)
Color consistency, displays text display is normal, the picture to screen, full-color play white, red, green and blue.
Technical advantage
Existing common indoor full-color scheme comparison:
1 the matrix modules: design, color dot matrix LCD by indoor artifacts
Advantage: the cost of raw materials, production and processing of the most advantage of simple process, quality is stable.
Faults: color consistency, Mosaic phenomenon, serious effect.
2. Single lamp schemes for solving the bitmap screen color: for outdoor screen technology, a scheme of pixels, outdoor multiplexing technique (also called pixel sharing technology, virtual pixels to indoor display technology) transplantation.
Advantage: color consistency than bitmap module of good way.
Weakness: the effect not beautiful, color mixing, horizontal Angle and have off color. Process is relatively complex, anti-static high. Actual pixel resolution do 10,000 more difficult.
第2个回答 2009-04-13
LED显示屏（LED panel）：LED就是light emitting diode ，发光二极管的英文缩写，简称LED。它是一种通过控制半导体发光二极管的显示方式，其大概的样子就是由很多个通常是红色的小灯组成，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、录像信号等各种信息的显示屏幕。
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。图文显示屏可与计算机同步显示汉字、英文文本和图形；视频显示屏采用微型计算机进行控制，图文、图像并茂，以实时、同步、清晰的信息传播方式播放各种信息，还可显示二维、三维动画、录像、电视、VCD节目以及现场实况。LED显示屏显示画面色彩鲜艳，立体感强，静如油画，动如电影，广泛应用于金融、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、工业企业管理和其它公共场所。
LED显示屏可以显示变化的数字、文字、图形图像；不仅可以用于室内环境还可以用于室外环境，具有投影仪、电视墙、液晶显示屏无法比拟的优点。
LED之所以受到广泛重视而得到迅速发展，是与它本身所具有的优点分不开的。这些优点概括起来是：亮度高、工作电压低、功耗小、小型化、寿命长、耐冲击和性能稳定。LED的发展前景极为广阔，目前正朝着更高亮度、更高耐气候性、更高的发光密度、更高的发光均匀性，可靠性、全色化方向发展。
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、可以显示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可以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，可以显示视频、动画等各种视频文件。
3、按使用场合分类
室内显示屏：发光点较小，一般Φ3mm--Φ8mm，显示面积一般几至十几平方米。
室外显示屏：面积一般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、Φ3.75mm、Φ5mm、
室外屏：Φ10mm、Φ12mm、Φ16mm、Φ19mm、Φ20mm、Φ21mm、Φ22mm、Φ26mm
室外屏发光的基本单元为发光筒，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共同发
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。
LED显示屏检验方法，
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，（一般来说现在的屏基本上没有了）
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
现有常见的室内全彩方案的比较：
1． 点阵模块方案： 最早的设计方案，由室内伪彩点阵屏发展而来
优势： 原材料成本最有优势，且生产加工工艺简单，质量稳定。
缺点： 色彩一致性差，马赛克现象较严重，显示效果较差。
2．单灯方案： 为解决点阵屏色彩问题，借鉴户外显示屏技术的一种方案，同时将户外的像素复用技术（又叫像素共享技术，虚拟像素技术）移植到了室内显示屏。
优势： 色彩一致性比点阵模块方式的好。
缺点： 混色效果不佳，视角不大，水平方向左右观看有色差。加工较复杂，抗静电要求高。实际像素分辨率做到10000点以上较难。
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