Transmission type screen, image display method for transmission type screen, and projection display apparatus
First Claim
1. A transmission type screen used for a rear projection type display apparatus for projecting image light from a rear surface thereof as seen from a viewer, comprising:
- a Fresnel lens screen for bending the image light from an emitter toward the viewer; and
an image display element for imaging the image light from the Fresnel lens screen and expanding the image light at a dispersion angle,wherein the Fresnel lens screen includes;
a Fresnel optical element including a prism formed on an incident surface side as seen from the emitter; and
first light diffusion means for diffusing the image light passing through the Fresnel optical element, andwherein the image display element includes;
a lens element for spatially dividing the image light from the Fresnel lens screen and changing a direction of the image light;
a birefringent layer provided at a subsequent stage of the lens element, for mixing image light obtained by spatial division by the lens element; and
second light diffusion means provided at a subsequent stage of the birefringent layer, for diffusing the image light passing through the birefringent layer.
1 Assignment
0 Petitions
Accused Products
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.
12 Citations
6 Claims
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1. A transmission type screen used for a rear projection type display apparatus for projecting image light from a rear surface thereof as seen from a viewer, comprising:
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a Fresnel lens screen for bending the image light from an emitter toward the viewer; and an image display element for imaging the image light from the Fresnel lens screen and expanding the image light at a dispersion angle, wherein the Fresnel lens screen includes; a Fresnel optical element including a prism formed on an incident surface side as seen from the emitter; and first light diffusion means for diffusing the image light passing through the Fresnel optical element, and wherein the image display element includes; a lens element for spatially dividing the image light from the Fresnel lens screen and changing a direction of the image light; a birefringent layer provided at a subsequent stage of the lens element, for mixing image light obtained by spatial division by the lens element; and second light diffusion means provided at a subsequent stage of the birefringent layer, for diffusing the image light passing through the birefringent layer. - View Dependent Claims (2, 3, 4, 5)
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6. An image display method for a transmission type screen used for a rear projection type display apparatus for projecting image light from a rear surface thereof as seen from a viewer,
the transmission type screen comprising: -
a Fresnel lens screen for bending the image light from an emitter toward the viewer; and an image display element for imaging the image light from the Fresnel lens screen and expanding the image light at a dispersion angle, the image display method comprising; a first diffusion step of diffusing, by the Fresnel lens screen, the image light passing through a Fresnel optical element; a spatially dividing step of spatially dividing, by the image display element, the image light from the Fresnel lens screen and changing a direction of the image light; a birefringent step of mixing image light obtained by spatial division in the spatially dividing step through birefringence; and a second diffusion step of diffusing the image light after the birefringent step.
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Specification