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Image display device, and projector

A technology for image display devices and projectors, applied in projection devices, optics, instruments, etc., can solve the problems of reduced light utilization efficiency, increased device cost, and overall size increase, so as to improve light utilization efficiency, suppress size increase, The effect of suppressing the number of parts

Inactive Publication Date: 2010-12-01
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a predetermined optical system is used to achieve a uniform illuminance distribution, there is a possibility that the desired image cannot be obtained through the positional relationship between the laser and the optical system
In addition, due to the structure of the optical system, there is a possibility that the overall size of the device will be increased, complicated, or the cost of the device will be increased.
In addition, due to the structure of the optical system, there is a possibility of causing a decrease in light utilization efficiency, etc.

Method used

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  • Image display device, and projector
  • Image display device, and projector
  • Image display device, and projector

Examples

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no. 3 Embodiment

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Abstract

An image display device includes: a laser light source device emitting laser light; and a diffractive optical element on which the laser light emitted from the laser light source device is incident, generating diffracted light from the incident laser light, and illuminating the first face with the diffracted light, the first face is provided at a position on which zero-order light emitted from the diffractive optical element is not incident, and an image is displayed by light via the first face.

Description

Image display device and projector technical field The present invention relates to a lighting device, an image display device and a projector. Background technique In the past, projection type image display devices (projectors) have been known. Projection-type image display devices use a projection system to project colored light with image information formed by a spatial light modulation device such as a liquid crystal device on a screen. In projection-type image display devices, techniques have been proposed in which laser light is used as a light source, as described in JP-A-11-64789 and JP-A-2000-162548. In such a projection-type image display device, it is necessary to illuminate the incident surface of the spatial light modulation device with a uniform illuminance distribution by laser light. When a predetermined optical system is used to achieve a uniform illuminance distribution, there is a possibility that a desired image cannot be obtained due to the posit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G03B21/00
Inventor 山内泰介武田高司
Owner SEIKO EPSON CORP
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