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Optical projector and image display apparatus using the same

An image display device, projection optical device technology, applied in optics, projection devices, optical components, etc., can solve the problems of deterioration of resolution, deterioration of contrast performance, etc., and achieve the effect of reducing deterioration of image quality

Inactive Publication Date: 2009-04-22
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only deteriorates the resolution, but also creates the problem that the diffusion layer on the viewing side deteriorates the contrast performance in the bright case that looks whitish due to the outside light

Method used

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  • Optical projector and image display apparatus using the same
  • Optical projector and image display apparatus using the same
  • Optical projector and image display apparatus using the same

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Experimental program
Comparison scheme
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Embodiment Construction

[0040] Embodiments of the present invention will be described below with reference to the drawings.

[0041] figure 1 It is a partial cross-sectional perspective view of the image display device of the present invention. exist figure 1 Among them, the image generation source 1 is composed of a projection type Braun tube or a reflective or transmissive liquid crystal panel, an image modulation element such as a mirror reflection type light modulation element having a plurality of tiny reflection mirrors, an illumination optical system such as a lamp, etc. to display a small image. The projection lens 2 projects the image onto the rear projection screen 3, but since the projection distance is generally long, a reflector 4 is provided in the optical path in order to reduce the depth of the image display device. The housing 5 fixes and stores the image generation source 1, projection lens 2, rear projection screen 3, and mirror 4 at predetermined positions.

[0042] figure 2...

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Abstract

The invention relates to an optical projector and an image display apparatus using the same. Image disturbance called speckle noise occurs when an image generator has a small effective screen size and a projection lens has a small effective diameter. The present invention is intended to reduce speckle noise. In an optical projector, a viewing angle enlarging ember (60) for enlarging viewing angle or a scattering member (28) for scattering image light is disposed near an image display. device (18), such as a liquid crystal panel. Speckle noise can be reduced, suppressing the deterioration of resolution and contrast.

Description

technical field [0001] The present invention relates to an image display device for enlarging and projecting an image formed by an image display element serving as an image generating source onto a screen through optical components such as a projection lens, and a projection optical device using the same. Background technique [0002] As an image generation source of a projection type image display device, a so-called pixel selection type image modulation element such as a liquid crystal panel can be used instead of a projection type Braun tube. The image modulation element modulates light from a light source such as a mercury lamp in units of pixels to form an image, and the effective screen size is as small as about 1 inch. In addition, the emitted light is closer to collimated light than the projection-type Braun tube. The projection lens used for this image modulation element is compact and has a high F number. (Furthermore, the F value is a numerical value representin...

Claims

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Application Information

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IPC IPC(8): G02B27/48G03B21/00G02F1/1335
Inventor 吉川博树大石哲平田浩二今福大辅
Owner HITACHI LTD