Liquid crystal cells – elements and systems – Particular structure – Lens or prism separate from projection system
Patent
1998-07-22
2000-05-16
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Lens or prism separate from projection system
349 61, G02F 11335
Patent
active
060644524
ABSTRACT:
White light is input to light diffracting means so composed as to have a structure including macro prisms combined with a lenticular structure and include diffraction gratings at a microscopic level. As the height (h(x)) of unit steps of said diffraction grating is modulated at every period of arranged pixels, the output diffracted light is decomposed into three primary colors, and guided with highly accurate matching to the three respective primary color pixels of a liquid crystal panel means. In the pitch modulation type diffraction grating of the prior art, it was basically impossible to avoid the defect that the converged positions of a red light ray and a blue light ray deviate about 30%. In contrast, according to the arrangement of this invention, it becomes possible to eliminate the deviation of the converged positions of not only the green light ray but the red light ray and the blue light ray, making it possible to provide a single plate type color liquid crystal display apparatus with high light utilization efficiency.
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Duong Tai V.
Hitachi , Ltd.
Sikes William L.
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