Dual layer holographic color filter and transmissive liquid crystal display using the same

Abstract

A dual layer holographic color filter and a transmissive liquid crystal display using the same. The dual layer holographic color filter includes a first hologram, which is provided between a light source and the liquid crystal display to spatially split white light from a substrate at the side of the light source, and a second hologram, which allows the split light to have the same direction as that of the light from the light source, to receive only light having a spectral bandwidth corresponding to colored cells of a color filter, so that the luminance of the liquid crystal display is enhanced. Light passing through the first hologram including hologram pieces is diffracted at different angles according to wavelengths. The second hologram recovers the traveling direction of the white light spatially split in the first hologram to an original direction of light from the light source.

Dependencies are inferred from the claim text.