Study Of Optical Efficiency Of LED Backlight Module

Due to the requirement of backlight module, a suitable outgoing lightangle and an uniform irradiance distribution is needed for LCD, includingimproving the efficiency by creative structure design and advancedfabrication technology, and decreasing the cost by reducing the number ofoptical film and volume. This paper mainly studies the scattering netted dotdistribution of light guide plate in the edge-light round backlight module, andimprove the system efficiency, besides, simulating and verifying the designby speos optical software. At the end, it is verified by the experiment.First, this paper introduces the development trend of LED backlightmodule and flat panel display technology, and the necessary optical theory.Then, according to the LED irradiance distribution function,a calculatingmethod of a several LEDs round light guide scattering network dot isproposed by analyzing the distribution of a single LED illumination. A roundbacklight module is simulated by speos optical software, and the resultsshows that can get a uniform illuminance distribution figure， and theuniformity is up to85%.For small size backlight module, this article through analysising thebacklight module light energy-saving, optimizing the structure parameters ofthe high brightness enhancement film, reducing the number of optical films,the thickness and the cost of the backlight module.Through the speossoftware simulation found that the backlight module using v-cut light guideplate and high brightness enhancement film(HBEF) having the largest normalluminous intensity and the best lighting angle in60°of the BEF angle. Thelargest luminous intensity is1.5times of traditional dots backlight module,and lighting angle reducing about10°angle.