Rear projection apparatus
AssigneesHitachi, Ltd., Nitto Denko Corporation
InventorYasuo Hira
Life of this patent
Estimating the term…
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.
Claims8
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 μm.
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.
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.
Dependencies are inferred from the claim text.