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Projection-type image display apparatus

A projection image and display device technology, which is applied in projection devices, image communication, television, etc., can solve the problems of reduced contrast and achieve the effect of improving contrast

Active Publication Date: 2010-12-01
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the decrease in contrast due to the increase in the transmittance of light passing through the pair of polarizing plates becomes significant.

Method used

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  • Projection-type image display apparatus

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Experimental program
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Abstract

A projection-type image display apparatus including: a light source unit; an optical modulator including an incident surface and an output surface both being perpendicular to an optical axis of a light beam emitted from the light source, and configured to modulate a light beam emitted from the light source; a first polarizer provided to a surface of the optical modulator; and a second polarizer provided to another surface of the optical modulator. In the projection-type image display apparatus, the polarization direction of a light beam allowed to pass through the first polarizer and the polarization direction of a light beam allowed to pass through the second polarizer are substantially orthogonal to each other, and the light source unit emits a cross shaped light beam.

Description

Projection Video Display Device technical field The present invention relates to a projection type image display device including a light source unit and a light modulation element for modulating light emitted from the light source unit. Background technique Conventionally, there is known a projection-type image display device (for example, a liquid crystal projector), which includes a light source emitting rectangular or circular light, a light modulation element (hereinafter referred to as a liquid crystal panel) for modulating the light emitted by the light source, and A projection lens that expands the light emitted from a liquid crystal panel and projects it onto a screen. Generally speaking, in the light emitted by the light source, the central portion of the light beam is brighter than its peripheral portion. Therefore, if the light emitted from the light source is irradiated on the liquid crystal panel as it is, the illuminance distribution of the light irradiated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/14G02B27/28H04N5/74
Inventor 新井一弘
Owner SANYO ELECTRIC CO LTD