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AssigneeDai Nippon Printing Co., Ltd.
InventorsTomohisa Hamano, Mitsuru Kitamura, Daijiro Kodama, Hiroshi Fujita, Hideo Yabuhara
Estimating the term…
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.
A computer-generated hologram designed to diffuse light having a given reference wavelength and incident thereon at a given angle of incidence in a specific angle range, characterized in that, in a range of wavelengths including said reference wavelength wherein zero-order transmission light or zero-order reflection light of incident light on said computer-generated hologram at a given angle of incidence is seen in white by additive color mixing, the maximum diffraction angle of incident light of the minimum wavelength in said range and incident at said angle of incidence is larger than the minimum diffraction angle of incident light of the maximum wavelength in said range and incident at said angle of incidence.
A computer-generated hologram comprising minute elemental hologram pieces closely arranged on a plane, wherein each elemental hologram piece has an optical path length enough to impart an identical phase distribution to reflection light or transmission light and wherein the computer-generated hologram is designed to diffuse light having a given reference wavelength and incident thereon at a given angle of incidence in a specific angle range, wherein, in a range of wavelengths including said reference wavelength wherein zero-order transmission light or zero-order reflection light incident on said computer-generated hologram at a given angle of incidence is seen in white by additive color mixing, the maximum diffraction angle of incident light of the minimum wavelength in said range and incident at said angle of incidence is larger than the minimum diffraction angle of incident light of the maximum wavelength in said range and incident at said angle of incidence.
Dependencies are inferred from the claim text.