Projection image display and image display system

An image display device and an image display technology, which are applied in the direction of using a projection device image reproducer, a projection device, photography, etc., can solve the problems such as the reduction of the color purity of the illumination light and the mixing.

Inactive Publication Date: 2003-06-04
CANON KK
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  • Abstract
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AI Technical Summary

Problems solved by technology

When the light (illumination light) incident on the image display element is incident as a light beam with a predetermined distribution, the dispersion of the incident angle corresponding to the beam spread angle will occur on the dichroic film, thereby, in the specified color The color components other than the component are mixed into the illumination light, and there is a problem that the color purity of the illumination light is reduced.

Method used

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  • Projection image display and image display system
  • Projection image display and image display system
  • Projection image display and image display system

Examples

Experimental program
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Embodiment Construction

[0079] first form of implementation

[0080] figure 1 The configuration of the projection-type image display apparatus according to the first embodiment of the present invention will be described. In the figure, 1 is an illumination light source composed of a high-pressure mercury lamp or the like, and 2 is a reflector for emitting light from the light source 1 in a predetermined direction.

[0081] 3 is an integrator for forming a uniform illumination area, and is composed of rope eye lenses 3a, 3b.

[0082] Numeral 4 is a polarization conversion element for aligning the unpolarized light direction with a predetermined polarization direction, and is composed of a polarization separation film 4a, a reflection film 4b, and a half-phase plate 4c.

[0083] Numeral 5 is a condensing optical system for illuminating step light, and is composed of lenses 5a and 5b and a reflecting mirror 5c. In addition, an illumination optical system within the scope of the claims is constitut...

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Abstract

In a projection type image display apparatus, when the angle of light incident on the multi-layer film of a polarizing beam splitter for synthesizing an optical path becomes uneven, the loss of the light occurs. So, the projection type image display apparatus of the present invention is provided with an illuminating optical system 1-5 b, a color separating and synthesizing optical system 7 for separating illuminating light from the illuminating optical system into a plurality of color lights and making the respective color lights enter image display elements 8 r- 8 b provided for the respective color lights, and synthesizing a plurality of image lights emerging from these image display elements, a projection optical system 10 for projecting and displaying the image lights synthesized by the color separating and synthesizing optical system, and polarizing elements Pr, Pg, Pb for transmitting only a particular polarized component light therethrough disposed between the color separating and synthesizing optical system and the image display elements.

Description

technical field [0001] The present invention relates to a projection-type image display device that decomposes illumination light of an illumination optical system into a plurality of color lights, synthesizes the modulated color lights by an image display element, and projects and displays an image. Background technique [0002] An image display element such as a liquid crystal display that modulates the polarization state of illumination light to generate image light is applied to an illumination optical system that illuminates an image display element. Projection-type image display apparatuses in which image light from an image display element is enlarged and projected are conventionally used. [0003] For an image display device using a so-called reflective image display element in which the illumination light incident side of the illumination optical system and the image light output side modulated by the image display element are the same as those of the image display ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00
CPCG03B21/00G03B21/005
Inventor 奥山敦大高圭史儿玉浩幸阿部雅之
Owner CANON KK
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