Invention Grant
US08553325B2 Transmission type screen, image display method for transmission type screen, and projection display apparatus 失效
透射型屏幕,透射型屏幕的图像显示方法和投影显示装置

Transmission type screen, image display method for transmission type screen, and projection display apparatus
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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