Patent ID: 7710026
Filing Date: 2010-05-04
Classification: H01J,H01L,H05B

Abstract:
1. An electroluminescent device, comprising: an LED formed on a substrate having a first electrode formed over the substrate, a second electrode formed over the first electrode, and an EL unit formed between the electrodes, wherein at least one of the first or second electrodes is transparent, the EL unit having a first optical index, and wherein at least one of the first or second electrodes is patterned to define independently controllable light-emitting areas; a cover formed over the LED and wherein the cover or substrate is transparent and has a second optical index and the light is emitted through the transparent cover or substrate; a light-scattering layer formed between the cover and substrate for scattering light; a low-index dement having an optical index lower than the first and second optical indices formed between the scattering layer and the transparent cover or substrate; and an electrically-insulating contrast-enhancement layer comprising a plurality of alternating light-absorbing portions and light-transmissive portions formed in a layer located between the light-scattering layer and the transparent substrate or cover through which the light is emitted on a side of the light-scattering layer opposite the transparent electrode and not in electrical contact with the transparent electrode, wherein a plurality of the light-absorbing portions and the light-transmissive portions are located in each light-emitting area.