Patent ID: 7934862
Filing Date: 2011-05-03
Classification: G02B,G02F

Abstract:
1. An ultra-violet based color-pixel backlight system for Liquid Crystal Display, without color filters, comprising: a light guide, having four edges and two broad surfaces, with its one edge transmitting UV rays and assembled with a multiplicity of UV emitting LEDs and the other three edges, opposite to and adjacent to the transmitting edge reflecting UV rays with its bottom surface coated with UV reflecting mirror and its top surface etched with pixelated square patterns for extracting UV light from the light guide; means for connecting UV LEDs to electrical power to emit UV radiation; said etched square patterns containing phosphor layers with a protective coating on top of the phosphor layers; said phosphor layers containing red, blue and green phosphors that convert the UV rays incident on them in to visible red, blue and green colors of light, with pixel patterns, that travels towards a sheet of micro-lens; said sheet of micro-lens, said etched pattern on the surface of the light guide and the LCD assembled such that the said sheet of micro-lens, said etched pattern on the surface of the light guide and the LCD are kept substantially in alignment to provide color-pixel backlighting to the LCD.