The new LED display has a low-power, high brightness, long life, such as the advantages of small size, this article from the LED display of the development of A Brief History of the beginning to explore the surface mount LED, automotive applications of LED lighting and LED with the development trend of Display engaged in the development of the Chinese engineers have some reference value.

The world's first commercial light-emitting diode (LED) in 1965 with materials made of germanium, the unit cost of 45 U.S. dollars. Soon followed by Monsanto and Hewlett-Packard also introduced the use of GaAsP materials produced by the commercial LED. These early-per-watt red LED to provide about 0.1 lumens (lumens) output flux, than the 60-100 watt incandescent lamp of 15 lumens at 100 times lower.

In 1968, LED research and development of breakthrough has been made in the use of nitrogen-doped GaAsP process so that the efficiency of the device reached a lumens / watt, and be able to issue a red, orange light and yellow light. To 1971, the industry also launched with the same efficiency of GaP die green LED.

In 1972 to start a small amount of LED displays for watches and calculators. The world's first use of LED watches in the first or expensive jewelry shops, and its price is as high as 2100 U.S. dollars. Almost at the same time, Hewlett-Packard and Texas Instruments also introduced a 7 with a red LED display of the calculator.

To the 1970s, as the LED devices in the home and office equipment in a large number of applications, LED prices fell in a straight line. In fact, LED is the main figures of that era with the text display. However, in many commercial devices, LED display is also increasing from other display technologies fierce competition, such as LCD, plasma and vacuum fluorescent tube display.

This competitive incentives LED manufacturers to further expand their product and actively seek a clear competitive edge LED applications. Since then applied LED dot matrix display text, background pattern with the lights and gate array line graph. A digital display size and complexity is growing, from 2 to 3-digit or 4, from 7 to be able to show that the number of complex combinations of text and images 14 or 16 arrays. In 1980 to the manufacturers started to provide intelligent LED dot matrix display.

In the early 80's a major technological breakthrough is developed AlGaAs LED, it can to 10 lumens per watt of red light-emitting efficiency of the issue. This technology can be used to make LED outdoor sports car, as well as information central to stop the installation of high light (CHMSL) devices. In 1990, the industry has developed to provide the equivalent of the best red device performance AlInGaP technology, which at that time than the standard GaAsP device performance than 10-fold.

Today, the brightest of the material should be transparent substrate AlInGaP. In the 1991-2001 period, materials technology, die size and shape further development of commercial LED luminous flux increased nearly 20 times.

Blu-ray high-intensity LED on the continuous development of several generations have had a higher brightness of the device. In 1990, about the launch based on silicon carbide (SiC) of the LED die material about the efficiency of 0.04 lm / W, light intensity few worthy of more than 15 cents (millicandel)'s. In the mid-90's breakthrough technology to achieve the first practical GaN-based LED. Now there are many different companies in the basement, such as the production of SiC and sapphire GaN LED, which can issue a green LED, blue or violet color, and so on. Bright blue LED's invention to make the realization of the true color display ads possible, so that the display can show true color, all-sports video images.

The emergence of blue LED so that people can use down the line conversion phosphor materials will be part of Blu-ray high energy to be converted to other colors. Blu-ray will be converted and yellow phosphorus can be integrated with white, and the integration of an appropriate number of blue and orange phosphorus (reddish orange phospher) can have a slightly purple or peach color. Now only LED light source can be completely covered by CIE color saturation curves in all the colors and a variety of LED colors and organic phosphorus integration is almost no limit to be able to produce any color.

Reliability, LED's half-life (that is, the light output down to the first half of the value of time) is about 1-10000 hour. On the contrary, the small half-life of the incandescent type instructions (in this case refers to the half-life half of the amount of time the light failure) is a typical 100,000 to the thousands of hours, depending on the lamp rated current.


Reference link: http://www.17led.com/LEDdisplay/2008-03/2.html