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Past And Present Led Display Come From?
Abstract: LED widespread attention and the reason why the rapid development, because it itself has many advantages. Physical possession of LED display technology is not exposed come from? This article shows you it's past lives.
LED display come from?
As early as 1923, Rosoff (Lossen.ow) in the study of impurities when the semiconductor SIC PN junction bright emission, developed the light-emitting diode (LED: Light Emitting Diode) had never been too seriously. With the rapid development of electronic industry, especially in the 60's period, the display technology are more rapid development, people have developed laser display PDP plasma display panel, LCD liquid crystal display, light emitting diode (LED), electrochromic display ECD, electrophoresis Show EPID and other new display technologies. However, as semiconductor production and processing technology matures and the improvement of light-emitting diode displays have become increasingly dominant in the solid position.
The reason why attention has been attached LED and rapid development, because it itself has many advantages. For example: high brightness, low voltage, power consumption, easy integration, driven simple, long life, impact resistance and stable performance, its market prospect is wide. Now has developed to a high brightness LED, high weather resistance and light density, light uniformity, full-color of.
The early 80s, with the development of computers, CGA display came up, it has 320 * 200 resolution in four colors, in just 10 years display has experienced CGA, EGA, SEGA, VGA, SVGA, to the development of ultra-high resolution, showing the development of precision from 320 to 1600 * 200 * 1250, from four colors to 32-bit true color, scanning frequency of development from 15.7K to 150K. Displays works by receiving signals from the host reduced to the form of light appear, along with the development of people need a large screen device, there will be a projector like it is similar to the display device. However, for reasons of its own brightness in high brightness conditions can not be used, then right again appeared LED display (screen), LED display with viewing angle, high brightness, colorful and so on. Along with technology, LED display has a wide range of applications, such as stadiums, highways, shopping malls, outdoor advertising and other places have it applied to the LED display.
The survey shows that people accept the message, 2 / 3 of the information is obtained through the eye. Display technology is also applied to industrial production, military, medical units, public security system and even the aerospace industry and so the national economy, social life and military fields, and play an important role, display technology has become a modern human society is an essential life technology.
Development of LED display
In 1970 the first GaP, GaAsP homojunction red, yellow, green and low luminous efficiency of LED has been applied to light, digital and text. From start to enter a variety of LED applications, including aerospace, aircraft, automotive, industrial applications, communications, consumer products, and thousands of families across national economic sectors. As of 1996, LED has reached worldwide sales of several billion dollars. Despite years of LED industry in color and the luminous efficiency by the restrictions, but because of GaP and GaAsP LED with long life, high reliability, the work of current, with TTL, CMOS compatible, and many other advantages of digital circuits has been well received by the users the favor. Especially in the last decade, high-brightness-based, full-color LED technology has been the study material and device technology topics at the forefront.
Ultra-high brightness (UHB) is the luminous intensity reaches or exceeds 100mcd the LED, also known as candela (cd) level LED. High-brightness InGaN LED A1GaInP and the development progressed very rapidly, has now reached conventional materials such as GaA1As, GaAsP, GaP impossible to achieve levels of performance. 1991, Japan's Toshiba Corporation and HP company has developed into InGaA1P 620nm orange, high brightness LED, 1992 InGaA1p590nm yellow ultra-bright LED practical. In the same year, Toshiba developed InGaA1P 573nm yellow-green high brightness LED, normal light intensity is 2cd. Nichia Corporation of Japan in 1994, developed into a blue InGaN 450nm (green) color high brightness LED. Thus, the three primary colors needed to color display of red, green, blue and orange and yellow colors of the LED reaches the candela luminous intensity level to achieve a high brightness-based, full-color technology, so that the outdoor full color LED show a reality.
The development of LED in China started in the seventies, industry emerged in the eighties. About 100 enterprises nationwide, 95% of manufacturers are engaged in after-package production, almost all of the die needed to be imported from abroad. Through several "five-year plan" of technological innovation, technical research, the introduction of foreign advanced equipment and some key technologies that enable the production of our LED technology has step forward.
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I am China Manufacturers writer, reports some information about wire crimping machine , extrusion presses.