An integrated LED reflector for backlight system

Abstract

An edge-backlight unit (EBLU) is applied as the light device to provide uniform light of liquid crystal display (LCD). Generally, the cathode cold fluorescent lamp (CCFL) is employed as the light source of BLU. With the advantages such as long durability, no mercury substance and good endurance of heavy impact, the light emitting diode (LED) is now accepted well known as available device for solid state lighting. To achieve the market requirement of the thin-film liquid crystal display (LCD) and the green-level product, the LED is replaced with the CCFL used in monitor in order to make display thinner, lighter, no Hg containing. In this paper, the integrated LED reflector is proposed because it enables the point-like light to distribute propagating-light line pattern successfully. To optimize the size and the radian of the reflector, our designed integrated LED reflector can achieve an optical efficiency more than 85%, and its light output length is 11 times of the input light source. Therefore, the integrated LED reflector not only can decrease the number of LED to save the built space, but also enhance the output efficiency. In the future, an integrated LED reflector could make displays thinner and brighter for backlight applications.