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Projective image display device

An image display device and image display technology, applied in the field of video projectors, can solve problems such as difficulty in increasing the contrast ratio

Inactive Publication Date: 2004-12-22
FUJI PHOTO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to increase the contrast in a system that directly reduces the light emission amount of the light source part

Method used

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Embodiment Construction

[0022] Hereinafter, embodiments of the projection type image display apparatus according to the present invention will be explained in detail with reference to the accompanying drawings.

[0023] figure 1 It is a schematic structural diagram showing a projection type image display device according to an embodiment of the present invention. Such as figure 1 As shown, for example, using the projection type image display apparatus 1 of this embodiment as a video projector, the projection type image display apparatus includes a light source portion 2, an illumination optical system 3 provided upstream of the light source portion 2 in the direction of the optical axis, An image display 4 is arranged upstream of the illumination optical system 3 in the direction of the optical axis, and a projection lens system 5 is arranged upstream of the image display 4 in the direction of the optical axis.

[0024] The illumination optical system 3 includes a color wheel (a color wheel) 31 for...

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Abstract

A projection type image display apparatus comprises a variable stop mechanism adapted to regulate the size of effective luminous flux diameter at a predetermined position in the optical path from an illumination optical system to a projection lens system, and image mode switching means for controlling operations of the variable stop mechanism. Respective image modes suitable for viewing in bright and dark surrounding environments are selected by switching between greater and smaller effective luminous flux diameters.

Description

[0001] related application [0002] This application claims priority from Japanese Patent Application No. 2001-299093 (filing date: September 28, 2001), which is incorporated herein by reference. technical field [0003] The present invention relates to a projection type image display apparatus such as a video projector including image display means such as a liquid crystal display device and a digital micromirror device (hereinafter referred to as "DMD"). More specifically, it relates to a projection type image display device equipped with an image mode switching function such as brightness and contrast of a projected image. Background technique [0004] Various types of projection-type image display devices are known, depending on the image display in which the light from the light source carries image information. [0005] For example, a transmissive liquid crystal projector using a transmissive liquid crystal display panel driven by an image signal as its image display ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B26/08G02B27/18G02F1/13G02F1/133G03B21/00G03B21/14G03B21/16
CPCG03B21/14G03B21/2053
Inventor 渡边贵志川合悟
Owner FUJI PHOTO OPTICAL CO LTD