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US 6,362,862 B1Granted
Liquid crystal display
AssigneeHitachi, Ltd.
InventorsOsamu Itoh, Shinichi Komura, Ikuo Hiyama, Shoichi Hirota, Masaya Adachi
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AssigneeHitachi, Ltd.
InventorsOsamu Itoh, Shinichi Komura, Ikuo Hiyama, Shoichi Hirota, Masaya Adachi
Estimating the term…
A liquid crystal display featuring excellent visibility with both good brightness and a high contrast ratio uses a projection optical system in which a polarizing plate, a first phase plate and a second phase plate in which the retardation of each of the phase plates and a gradient of wavelength dispersion of the retardation can be freely set, a liquid crystal layer, and a reflection plate are arranged in parallel and a transmitted light is reflected by the reflection plate. A gradient of one of the phase plates is set to an extremely steep gradient, a gradient of the other phase plate is set to an extremely flat gradient, and the wavelength dispersion of a retardation composite value obtained from the liquid crystal layer and the two phase plates is approximated to a retardation curve expressed by a relational expression of (0.25+0.5n)λ, where (n) is an integer and λ is a wavelength (nm) of the transmitted light.
A liquid crystal display in which a polarizing plate, first and second phase plates, an upper substrate, a liquid crystal layer, a drive device, and a lower substrate also serving as a reflection plate are sequentially laminated in a travelling direction of transmitted light, and an absorption axis direction of the polarizing plate and an alignment direction of the liquid crystal layer, which is on the side adjacent to the polarizing plate have a non-parallel relation, wherein each of the first and second phase plates has a wavelength dispersion of a retardation such that a wavelength dispersion of a retardation composite value of the first and second phase plates and the liquid crystal layer is substantially approximated to a retardation curve expressed by a relational expression of one of (0.25+0.5n)λ and (0.5n)λ in a range of wavelengths from 400 nm to 700 nm of said transmitted light,
A liquid crystal display in which a polarizing means, first and second phase plates, an upper substrate, a liquid crystal layer, a drive device, and a lower substrate also serving as a reflection plate are sequentially laminated in a travelling direction of transmitted light, and an absorption axis direction of the polarizing means and an alignment direction of the liquid crystal layer, which is on the side adjacent to the polarizing means, have a non-parallel relation, wherein the polarizing means is a polarizing plate of a type in which a vibration direction of a transmission polarization component of the polarizing means rotates by 90° when a passing direction of the transmission light is changed, and
A liquid crystal display having a projection optical system in which a polarizing plate, a phase plate arrangement, a liquid crystal layer, and a reflection plate are arranged in parallel and transmitted light is reflected by the reflection plate, wherein the phase plate arrangement comprises first and second phase plates in which a retardation of each of the first and second phase plates and a gradient of wavelength dispersion of the retardation can be freely set, and
A projection-type liquid crystal display comprising a drive device, a light source, an optical system, and a plurality of liquid crystal display elements, characterized in that each of the plurality of liquid crystal display elements includes a liquid crystal layer, two substrates, and at least one phase plate, and retardations of the phase plates of the plurality of liquid crystal display elements are different from each other, wherein the two substrates forming each of the plurality of liquid crystal display elements have a display electrode and an alignment layer, the display electrode which is provided on a lower substrate of the two substrates also serving as a reflection plate, the display electrode on the lower substrate being connected to an active element, the two substrates being arranged so as to face each other with the liquid crystal layer sandwiched therebetween, and a delay axis of the phase plate is in parallel with or perpendicularly crosses an adjacent alignment direction of the liquid crystal layer,
Dependencies are inferred from the claim text.