Projector

A technology for projectors and projection optical systems, which is applied in the field of projectors and can solve problems such as complex structures, deterioration of quietness, and reduction of light spots

Inactive Publication Date: 2007-10-10
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to perform high-speed rotation of the fly-eye lens, not only a large and complicated structure is required, but also quietness is deteriorated
Thus, according to the prior art, there is a problem that it is difficult to reduce speckle with a simple structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example 〕

[0076] FIG. 1 shows a schematic configuration of a projector 10 according to a first embodiment of the present invention. The projector 10 is a so-called front projection type projector in which an image is viewed by supplying light to the screen 20 and observing the light reflected by the screen 20 . The projector 10 displays images using red laser light (hereinafter referred to as “R light”), green laser light (hereinafter referred to as “G light”), and blue light (hereinafter referred to as “B light”).

[0077] FIG. 2 shows a structure for supplying and modulating R light in the projector 10 . The light source unit 11R supplies four laser beams in the same or similar wavelength ranges. By using a plurality of laser beams, it is possible to supply a large amount of light. The light source unit 11R has four semiconductor lasers as solid-state light sources. In addition, as the light source unit 11R, a surface-emitting semiconductor laser in which four light emitting units ...

no. 2 example

[0110] FIG. 14 shows a schematic configuration of a projector 70 according to a second embodiment of the present invention. The projector 70 is characterized by having a micromirror array device 71 as a spatial light modulator. The same parts as those in the above-mentioned first embodiment are given the same symbols, and redundant explanations are omitted. The R light from the wavelength conversion element 12R enters the cross dichroic prism 15 via the diffractive optical element 13R. The G light from the wavelength conversion element 12G enters the cross dichroic prism 15 via the diffractive optical element 13G. The B light from the wavelength conversion element 12B enters the cross dichroic prism 15 via the diffractive optical element 13B. The cross dichroic prism 15 makes R light, G light, and B light incident on the micromirror array device 71 .

[0111] The micromirror array device 71 has a plurality of movable mirror elements (not shown) formed on the incident surfac...

no. 3 example

[0114] FIG. 15 shows a schematic configuration of a projector 80 according to a third embodiment of the present invention. The projector 80 has an optical scanning device 85 that scans the laser beams from the light source units 81R, 81G, and 81B. The same parts as those in the above-mentioned first embodiment are given the same symbols, and repeated explanations are omitted. The light scanning device 85 is an image forming unit that forms an image using laser light from the light source units 81R, 81G, and 81B.

[0115] The R-light light source unit 81R supplies the R-light modulated according to the image signal. The G-light light source unit 81G supplies G-light modulated according to an image signal. The B-light light source unit 81B supplies the B-light modulated according to the image signal. Any of amplitude modulation and pulse width modulation can be used for modulation corresponding to the image signal. Each of the light source units 81R, 81G, and 81B has a semic...

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Abstract

A projector reducing light spot by using simple structure includes: a liquid crystal type space light modulating devices (14R, 14G, 14B), which use light emitted from a light source section (11R, 11G, 11B) having solid-state light source form image forming section of image; a diffusion section (17) which is provided at focal positions of light components of the image formed by the image forming section and diffuses the light; a projection optical system (18) that projects the light emitted from the diffusion section (17), and the diffusion section (17) changed phase of light at each position of light incidence.

Description

technical field [0001] The present invention relates to projectors, especially the technology of projectors using laser light sources. Background technique [0002] When laser light as coherent light is irradiated onto a diffusing surface (scattering surface), bright and dark spots are randomly (randomly) distributed and an interference pattern called a speckle pattern appears. The speckle pattern is generated by the random interference between the diffused lights at various points on the diffusing surface. When the light spots can be recognized during image display, it will give the observer a dazzling flickering feeling, so it will adversely affect the viewing of the image. For example, a front projection projector preferably uses a configuration in the optical path from the light source to the projection optical system to seek to reduce speckle patterns. For example, Patent Document 1 proposes a technique of reducing speckle using a fly-eye lens provided in an optical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14G02F1/13G02B13/22H04N5/74H04N9/31
CPCG03B21/00G02B5/0242G02B5/0278G02B27/48G02F1/133504H04N9/3105H04N9/3111H04N9/3132H04N9/3161H04N9/3197G03B21/005H04N9/3152
Inventor 武田高司
Owner SEIKO EPSON CORP
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