Light-emitting diode cover lens design for large-scale liquid crystal device television backlight

Abstract

We present a high-performance cover lens for light-emitting diode ͑LED͒ light sources to be applied to large-scale liquid crystal device television ͑LCD-TV͒ backlight modules. The cover lens with simple structure can redistribute light rays emitted from an LED light source to make the light distribution more extended so that the luminance uniformity of the backlight module can be increased. To gain a better performance, the parameters of the lens structure are optimized using a genetic algorithm. The simulation result shows that using the cover lens can achieve a luminance uniformity of 94.75% and an optical efficiency of 72.29% for a 46-in LCD-TV backlight module.

Liquid-crystal photonic applications

“…Because there are no moving parts in such a lens, they can be more reliable and able to withstand mechanical shock. Such tunable lenses can be applied in adaptive binocular glasses, autofocus cameras, LED lightsteering applications, 41 3-D confocal microscopy, 42 etc. A wide number of approaches have been studied to realize tunable lenses, and some of them are illustrated in Fig.…”

Holographic arrays based on semiconductor microstructures

“…2 In addition, increases in computational power are set to enable the emerging technology of computer-generated holography, 3 useful for displays, data transmission, data storage, 4 and optical tweezers. 5 Due to hardware restrictions, most existing routes rely on phase-only modulation, which requires intensive algorithms for holographic fringe pattern calculation.…”

Theoretical analysis and design for highly collimated planar light source based on organic light-emitting diodes using Fresnel lens

“…1 was set up and systematically simulated by 3D Monte Carlo ray tracing using a commercial Tracepro 7.0 software package (Lambda Research). 20,21) The OLED structure was glass substrate (20 × 20 × 1 mm 3 )=indium-tin oxide (ITO) (3 × 3 × 0.0001 mm 3 )=multiorganic layers (N,NA-di(naphthalene-1-yl)-N,NA-diphenyl-benzidine (NPB)=tris(8-hydroxyquinoline)aluminum (Alq3): 3 × 3 × 0.00009 mm)=bilayer cathode (LiF=Al: 0.0001 mm) [Fig. 1(c)].…”