Quantum rod based color pixel backlight for lcd

Abstract

A quantum rod based color pixel backlight system for Liquid Crystal Display, not requiring color filters and traditional polarizer, comprising multiplicity of LEDs, emitting ultraviolet or near-ultraviolet or blue light, assembled at one edge of a ultraviolet or near-ultraviolet or blue light transmitting light guide, which has other three edges and bottom surface coated with ultraviolet/near-ultraviolet reflecting layer and its top surface roughened with ultraviolet and near-ultraviolet extracting pixel patterns that contain aligned layers of quantum rods that emit different colors of plane polarized light in red, blue and green region with sharp spectrum, to increase the color gamut and optical efficiency of LCD screen, upon excitation by ultraviolet or near-ultraviolet or blue light. The formed pixels contain reflective islands or continuous reflective surface, underneath the layers of aligned quantum rods, to reflect the visible rays, generated by the pixelated quantum rods, towards the LCD and suppress the visible light leaving the pixel in other directions as well as suppress the visible light from adjacent pixels entering the pixel. Thus suppressing the inter-pixel color mixing that could occur without the incorporation of reflective islands or continuous reflective layer. LCD not requiring color filters and traditional polarizer, a micro-lens sheet and the light guide with color pixels are placed in substantial alignment to provide a color pixel backlight system for LCD. Thus plane polarized red, blue and green pixels of light from the light guide passes through the intended red, blue and green pixels of the color LCD, not requiring color filters and traditional polarizer, resulting in color pixel backlighting that enhances the optical efficiency of LCD as well as the color gamut on LCD screen.