Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Patent
1997-06-09
2000-12-12
Parker, Kenneth
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
349 65, 349115, G02F 11335
Patent
active
061605956
ABSTRACT:
An object of the invention is to obtain brighter display in a liquid crystal display apparatus. Light of all the wavelengths in the visible range is converted into circularly polarized light by a first polarization condition converting member, converted into linearly polarized light by a second polarization condition converting member and is modulated by a liquid crystal display device. Then, transmission and block of the light is controlled by a polarizer. Specifically, one of the dextrorotatory circularly polarized light and the levorotatory circularly polarized light is reflected by a spectral member included in the first polarization condition converting member, converted into the other circularly polarized light by a reflecting member included in the first polarization condition converting member and supplied again to the spectral member. The other circularly polarized light is transmitted by the spectral member. Thus, by converting light of all the wavelengths in the visible range into circularly polarized light and then converting the circularly polarized light into linearly polarized light, in principle, 100% of the light is incident on a liquid crystal display device, so that brighter display is achieved.
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Conlin David G.
Neuner George W.
Parker Kenneth
Sharp Kabushiki Kaisha
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