Research And Design Of The New 23.6-inch LED Backlight Base On LED7707

Back light module is the key Parts of LCD panel. Since the LCD itself does not glow, the function of backlight is Adequate supply of uniform brightness and light source, To enable them to properly display images. The backlight module is currently available in the market mainly uses two light sources, CCFL(Cold Cathode Fluorescent Lamp) and LED (Light Emitting Diode). Traditional CCFL tube using high voltage and low current drive, In areas of low environmental temperature, Starting voltage will be higher even would not boot. About 20,000 hours life,60% color saturation, These shortcomings have restricted the CCFL backlight in LCD display developments. In contrast, LED backlight with high brightness, high color purity and long life, adaptability, reliability, easy-to-industry and other advantages, As technology advances, LED has gradually become the ideal LCD backlight.This paper detailed analysis of the backlight for the LCD. Research the material properties of each component and how it works. Analysis the structure and optical properties of backlight module between CCFL and LED as the light source. Compare advantages and disadvantages of two light sources. Pointed out the new trend that LED replace the CCFL. Analysis the development direction and China's development prospects of LED on a global scale. Pointed out the factors of limit the development of mainland China LED companies and direction of the innovation in the future According to the electrical characteristics of LED. Compare several different LED drive, Choose LED7707IC design an LED driver circuit. And targeted LED light source characteristics for the point, based on researching working principle of the light guide plate and processing methods, Designed 23.6-inch LED backlight dot distribution, And produced samples. Finally, the sample design has been completed the electrical and optical test. Based on the results, adjust the design of optical and circuit. Test results show that the requirement to meet the design parameters:P<16W;Center brightness>4500 cd/m2; Uniformity>80%;Chromaticity coordinates x=0.295±0.02, y=0.275±0.02。...