Computer-generated hologram, reflector using a computer-generated hologram, and reflective liquid crystal display

摘要

The invention provides a computer-generated hologram which can be viewed in white at the desired viewing region and a reflective liquid crystal display using the same as a reflector. The computer-generated hologram H is designed to diffuse light having a given reference wavelength λSTD and incident thereon at a given angle of incidence θ in a specific angle range. In a range of wavelengths λMIN to λMAX including the reference wavelength λSTD wherein zero-order transmission light or zero-order reflection light of incident light on the computer-generated hologram at a given angle of incidence is seen in white by additive color mixing, the maximum diffraction angle β2MIN of incident light of the minimum wavelength λMIN in the wavelength range and incident at the angle of incidence θ is larger than the minimum diffraction angle β1MAX of incident light of the maximum wavelength λMAX in the wavelength range and incident at said angle of incidence θ.