Rear projection apparatus
First Claim
1. A rear projection apparatus comprising a projector containing a light source and a liquid crystal cell, a mirror for reflecting a light from the projector, and a screen for projecting the light reflected by the mirror, the screen being composed of an optical film comprising an optical element capable of forming a spatial distribution of light transmittance, a light shield layer and a light diffusion layer, the light shield layer being positioned between the optical element and the light diffusion layer and being composed of a compound which changes light transmittance depending on irradiation of an energy beam, wherein the light transmittance passing the light shield layer is modulated spatially depending on a dose of the energy beam, and wherein the light shield layer and the light diffusion layer are positioned with a gap of no greater than 400 μ
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Accused Products
Abstract
A rear projection apparatus having a projector containing a light source and a liquid crystal cell, a mirror for reflecting a light from the projector, and a screen for projecting the light reflected by the mirror. The screen is being composed of an optical film having an optical element capable of forming a spatial distribution of light transmittance, a light shield layer and a light diffusion layer. The light shield layer is positioned between the optical element and the light diffusion layer and is composed of a compound which changes light transmittance depending on irradiation of an energy beam. The light transmittance passing the light shield layer is modulated spatially depending on a dose of the energy beam.
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Citations
8 Claims
- 1. A rear projection apparatus comprising a projector containing a light source and a liquid crystal cell, a mirror for reflecting a light from the projector, and a screen for projecting the light reflected by the mirror, the screen being composed of an optical film comprising an optical element capable of forming a spatial distribution of light transmittance, a light shield layer and a light diffusion layer, the light shield layer being positioned between the optical element and the light diffusion layer and being composed of a compound which changes light transmittance depending on irradiation of an energy beam, wherein the light transmittance passing the light shield layer is modulated spatially depending on a dose of the energy beam, and wherein the light shield layer and the light diffusion layer are positioned with a gap of no greater than 400 μ
- 4. A rear projection apparatus comprising a projector containing a light source and a liquid crystal cell, a mirror for reflecting a light from the projector, and a screen for projecting the light reflected by the mirror, the screen being composed of an optical film comprising an optical element capable of forming a spatial distribution of light transmittance, and a light shield layer positioned on an opposite side of the optical element, the light shield layer containing small balls having transmittivity.
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8. A rear projection apparatus comprising a projector containing a light source and a liquid crystal cell, a mirror for reflecting a light from the projector, and a screen for projecting the light reflected by the mirror, the screen being composed of an optical film comprising a microlens array, a light shield layer and a light diffusion layer, the light shield layer being positioned between the microlens array and the light diffusion layer, and the light shield layer being composed of a compound which changes light transmittance depending on irradiation of an energy beam and is at least silver or a compound containing silver, wherein the light transmittance passing the light shield layer is modulated spatially depending on a dose of the energy beam, and high light transmittance regions in the light shield layer are obtained on optical axes of the microlens array.
Specification