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Projection type display
   
Document Number
US Patent 6517212
Issued Date
February 11, 2003
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Abstract
In a projection type display, light rays emitted from two light sources pass through an integrator made up of fly-eye lenses or the like, and proceed through predetermined light paths including condenser lenses, and are focused on liquid crystal light valves of liquid crystal panels or the like, where the light rays are converted into video information. This projection type display includes: two light sources; two parabolic reflectors for condensing light rays from the light sources; and a multiple number of prisms for dividing the light rays condensed by the parabolic reflectors in the substantially same direction into multiple elongate rectangular sections.
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Number of Claims:
10
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Owner
Published
February 11, 2003
Application Number
09/732,973
Filed
December 8, 2000
US Classification
353/99   353/31 353/38
Int'l Classification
H04N   9/31   (20060101)  
Examiner
Assistant Examiner
Priority Data
Dec 08, 2000 [JP] 11-349317
USPTO Field of Search
353/38   353/51   353/81   353/98   353/99  
Related Patents
7503660 - Light mixing member, multiple-lamp lighting equipment and projection video display - Owned by Sanyo Electric Co., Ltd. (Osaka,JP)

A reflection mixing member (13) has an alignment in which light from a first light source is incident on a reflecting surface (13a) and light from a second light source is incident on a reflecting surface (13b). A relationship between a pitch Wp, which is a pitch between portions (triangular prisms) respectively formed of the reflecting surface (13a) and the reflecting surface (13b) in the reflection mixing member (13), and a lens pitch Wf is set to be (Wp/Wf.noteq.1). As a result, light fluxes of respectively different distribution are incident on each lens portion of fly's eye lens 14a, so that it is possible to prevent luminance non-uniformity in light incident on a liquid crystal display panel (5) from being generated and prevent color non-uniformity from being generated on a screen at the same time.

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Description
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