1、 本科毕业设计 ( 论文 ) 外文翻译（附外文原文） 学 院： 信息科学与工程学院 课 题 名 称 ： 基于单片机的定时显示设计 专业 (方向 )： 通信工程 班 级： 通信 09-1 学 生： 何探 指 导 教 师 ： 牛秦洲 日 期 ： 2013.4.23 1.1 LED display background of the development and research status More and more places in shopping malls, railway stations, docks, subway stations and a variety of work
2、window LED dot matrix display graphics and characters. LED industry has become a fast-growing emerging industry, a huge market space and broad prospects. With the rapid development of the information industry, LED display has been widely used as an important means of dissemination of information, co
3、ntent and services aim to promote the need for indoor and outdoor public places, such as indoor and outdoor advertising in public places, the airport station visitors guide bus stop vehicles, securities and banking information display, restaurants offer information beans shown, highway variable info
4、rmation boards, stadiums the games, building lighting, traffic lights, landscape lighting. Clearly, LED display has become an important symbol of the city lighting, modern information society. LED dot matrix design is mainly used in display, it is a light emitting diode dot matrix module or unit of
5、pixels composed of a flat display screen. Because it has the advantages of high luminous efficiency, long life, and flexible configuration, rich colors, and the indoor and outdoor environmental adaptability. The 1970s, the first GaP, GaAsP homogeneous knot red, yellow, green and low luminous efficie
6、ncy LED began to be used indicator, numbers, and text. From the LED starts to enter a variety of applications, including aerospace, aircraft, automotive, industrial applications, communications, consumer products, etc., throughout the various departments of the national economy, and thousands of fam
7、ilies. 1996 LED sales have reached billions of dollars around the world. Over the years the LED has been subject to the limitations of color and luminous efficiency, but because of the GaP and GaAsP LED with long life, high reliability, operating current, and thus has many advantages with TTL, CMOS
8、digital circuits compatible green by user Mi. In recent years, high brightness, full color LED material and device technology research topics at the forefront. The ultra-high brightness (UHB) is the luminous intensity at or above 100mcd LED, also known as the candela (cd) level LED. The development
9、of high-brightness InGaN LED A1GaInP and progressed very rapidly and has now reached conventional materials GaA1As, GaAsP, GaP impossible to achieve the level of performance. In 1991, Toshiba Corporation of Japan and the United States HP company developed into InGaA1P 620nm orange ultra-high brightn
10、ess LED 1992 InGaA1p590nm yellow high brightness LED practical. The same year, Toshiba developed InGaA1P 573nm yellow-green ultra-high brightness LED, normal light intensity 2CD. 1994 Nichia Corporation of Japan for the development of ultra-high brightness LED InGaN blue 450 nm (green) color. At thi
11、s point, the color display the required three primary colors red, green, blue, and orange, and yellow colors of LED have reached cd luminous intensity level, to achieve a super high brightness, full color, so that the light emitting tube outdoor panchromatic become a reality. Was started in the 1970
12、s, Chinas development of LED industry in the 1980s. About 100 enterprises, 95% of manufacturers are engaged in the back-end packaging production, the required die almost all imported from abroad. Through several Five-Year Plan technological innovation, technology research, the introduction of foreig
13、n advanced equipment and key technologies, LED production technology in China has step forward. 1.2 LED display classification 1 classification by color Single-color display: single color (red or green). Dual color display, you can display 65,536 colors: red and green dual-color, 256 levels of gray.
14、 Full-color display: red, green and blue color, 256 levels of gray, full-color screen can display more than sixteen million kinds of colors. By display Category LED digital display: display 7-segment digital tube, suitable for the production of the clock screen, such as interest rates screen, displa
15、y digital electronic display. LED dot-matrix graphic display: display device is composed by many evenly light-emitting diode dot matrix display module, suitable for broadcast text, image information. LED video display: the display device is composed of a plurality of light-emitting diode, you can di
16、splay video, animation and other video files. 3 occasions by the use of classification Indoor display: the luminous point is small, generally 3mm - 8mm, shows the general area of a few dozen square meters. Outdoor display: the general area of tens of meters to several hundred square meters, high brightness, can work in the sun, wind, rain, water resistant.
