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US5703663A Projection type liquid crystal display apparatus 失效
投影式液晶显示装置

Projection type liquid crystal display apparatus
摘要:
The projection type liquid crystal display apparatus of the invention includes: a light source; a liquid crystal display device; and a projection lens. In the projection type liquid crystal display apparatus, the projection lens and the liquid crystal display device are arranged to satisfy the relationship: .theta..sub.LC-max -1.degree..ltoreq..theta..sub.LENS .ltoreq..theta..sub.LC-max +1.degree., where .theta..sub.LENS is a collection angle of the projection lens and .theta..sub.LC-max is a maximum viewing angle of the liquid crystal display device at which a contrast ratio of an image light beam emitted through the projection lens CR.sub.PROJ is equal to a prescribed contrast ratio CR.sub.TARGET, and CR.sub.PROJ is calculated by the following equation: CR.sub.PROJ =.intg.T.sub.max (.theta..sub.LC, u, V.sub.LC-max).multidot.t(.theta..sub.LC) d.theta..sub.LC /.intg.T.sub.min (.theta..sub.LC, u, V.sub.LC-min).multidot.t(.theta..sub.LC)d.theta..sub.LC, where, u=d.multidot..DELTA.n/.lambda.; t(.theta.) is a luminance at an angle .theta. of the light beam incident onto the liquid crystal display device; .intg.T.sub.max (.theta..sub.LC, u, V.sub.LC-max) is a maximum transmittance at .theta..sub.LC ; and .intg.T.sub.min (.theta..sub.LC, u, V.sub.LC-max) is a minimum transmittance at .theta..sub.LC.
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