The origin of the LED

The 1970s, the earliest of GaP, GaAsP homojunction red, yellow, green and low luminous efficiency, LEDs have been used in light, digital, and text display.

Since then the LED will start to enter a variety of application areas including aerospace, aircraft, automotive, industrial applications, communications, consumer products, throughout the various departments of the national economy and millions of households.LED Lighting module 1996 LED sales in the world has reached billions of dollars. LED over the years has been subject to the limitations of color and luminous efficiency, but because of GaP and GaAsP LED with long life, high reliability, operating current is small, with many of the advantages of TTL, CMOS digital circuits compatible and therefore has been subject to the users of the green squint.

The last decade, high-brightness technology, full-color has been the topics at the forefront of LED materials and device technology. The ultra-high brightness (UHB) is the luminous intensity to meet or exceed 100mcd the LED, also known as the candela (cd) level LED. High-brightness InGaN LED A1GaInP and development has progressed very rapidly and has now reached the conventional materials GaA1As, GaAsP, GaP can not reach the level of performance.

1991 Toshiba Corporation, Japan and the United States by HP for the development of InGaA1P 620nm orange ultra-high brightness LED, 1992 InGaA1p590nm yellow ultra-high brightness LED practical. The same year, Toshiba has developed InGaA1P 573nm yellow-green ultra-high brightness LED, the intensity of 2cd.

Nichia Corporation of Japan in 1994 the development of InGaN 450nm blue (green) color ultra high brightness LED. At this point, the three primary colors needed to color display of red, green, blue and orange, yellow colors of the LED to reach the candela luminous intensity level to achieve high brightness, full color, outdoor full color LED show a reality. The development of LED started in the 1970s, the industry in the 1980s.

There are about 100 enterprises,Bluetooth keyboard device 95% of manufacturers are engaged in the production of post-Road package, the required die almost entirely imported from abroad. Several "Five-Year Plan" technological innovation, and technology research, the introduction of foreign advanced equipment and some key technologies, China's LED production technology has stepped forward a step.
by fashiongirl | 2012-03-26 13:36

All time is no time when it is past.

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