Invention Grant
- Patent Title: Transmission type screen, image display method for transmission type screen, and projection display apparatus
- Patent Title (中): 透射型屏幕,透射型屏幕的图像显示方法和投影显示装置
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Application No.: US12908267Application Date: 2010-10-20
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Publication No.: US08553325B2Publication Date: 2013-10-08
- Inventor: Takao Endo , Yuzo Nakano
- Applicant: Takao Endo , Yuzo Nakano
- Applicant Address: JP Tokyo
- Assignee: Mitsubishi Electric Corporation
- Current Assignee: Mitsubishi Electric Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2010-101246 20100426
- Main IPC: G03B21/56
- IPC: G03B21/56

Abstract:
The transmission type screen includes: a Fresnel lens screen (20); and an image display element (30), in which the Fresnel lens screen includes: a Fresnel optical element (21) including a prism formed on an incident surface side as seen from the emitter; and a first light diffusion unit (22) for diffusing an image light passing through the Fresnel optical element, and the image display element includes: a lens element (40) for spatially dividing the image light from the Fresnel lens screen and changing a direction of the image light; a birefringent layer (90) provided at a subsequent stage of the lens element, for mixing image light obtained by spatial division; and a second light diffusion unit (60) provided at a subsequent stage of the birefringent layer, for diffusing the image light passing through the birefringent layer.
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