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Image projection device and rear projection type display device

A technology of projection device and display device, applied in projection device, image communication, projector with built-in screen/external screen, etc., can solve the problems of obstructing objects, observation of laser, etc., to improve safety and increase expansion angle , The effect of realizing the miniaturization of the device

Inactive Publication Date: 2008-06-18
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, in the structure of Patent Document 3, when the laser light is linear light, even if the distance from the image projection device is large, the laser light cannot be observed before the laser light is reflected on the screen, so there is a need to prevent people from entering the image. The problem of shielding from the projection device to the screen is not only an obstacle but also an increase in the size of the device

Method used

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  • Image projection device and rear projection type display device
  • Image projection device and rear projection type display device
  • Image projection device and rear projection type display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0090] FIG. 1 is a configuration diagram of an image projection device 100 according to Embodiment 1 of the present invention.

[0091] In FIG. 1 , an image projection device 100 consists of an image projection unit 101 that projects laser light, a first turning mirror 102 that bends the laser light emitted from the image projection unit 101 at first, and a first turning mirror 102 that passes the laser light emitted from the projection lens. The second folding mirror 103 reflected on the screen, the folding holding frame 106 and the frame body 105 constitute.

[0092] The image projection unit 101 is preferably composed of a laser light source, a two-dimensional light modulation element such as a liquid crystal panel or a micro-mirror array, and a projection lens. Alternatively, the image projecting unit 101 may also be composed of a laser light source, a one-dimensional light modulation element, a converging lens, and an optical scanning element.

[0093] Next, the image pr...

Embodiment approach 2

[0114] 6 is a configuration diagram of an image projection device according to Embodiment 2 of the present invention, and the same reference numerals are used for the same elements as those in FIG. 1, and their descriptions are omitted. Also, in Embodiment 2, since the image projection device 101 uses a one-dimensional or two-dimensional spatial light modulator and has the same configuration as in FIGS. 2 and 3 , description thereof will be omitted.

[0115] An image projection device 600 according to the second embodiment is different from the first embodiment in that a restriction plate 601 is provided instead of the holding frame 106 described in the first embodiment.

[0116] In FIG. 6 , the limiting plate 601 is preferably made of a transparent acrylic plate having a high transmittance to the projected light 104 and is preferably larger than the cross-sectional area of ​​the projected light 104 . In addition, the second turning mirror is provided so as to maintain a prede...

Embodiment approach 3

[0128] 7 is a configuration diagram of a rear projection display device according to Embodiment 3 of the present invention.

[0129] In FIG. 7, the rear projection type display device 700 related to the third embodiment has its laser emission surface facing the screen 710 side, and an image projection unit 701 which projects laser light, bends the laser light emitted from the image projection unit 701 to an image. The first turning mirror 707 on one side of the projection unit 701 reflects the laser light reflected by the first turning mirror 707 to the screen 710, and the second turning mirror 708 that emits the laser light from the image projecting unit 701 to the screen 710 is transmitted by the laser beam from the image projecting unit. 701 is composed of a screen 710 on which laser images are displayed and a frame 711 that houses them.

[0130] Like image projection unit 101 in Embodiment 1, image projection unit 701 in Embodiment 3 is preferably composed of a laser light...

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Abstract

An image projection device includes: image projection means (101) for projecting an image by laser light by using a one-dimensional or two-dimensional spatial light modulation element; a first bending mirror (102) for firstly bending the laser light emitted from the image projection means (101); and a second bending mirror (103) for reflecting the laser light emitted from the image projection means (101) via the first bending mirror (102) against a screen (107). The distance between the second bending mirror (103) and the image projection means (101) is set greater than the distance L where the light output emitted from the projection lens of the image projection means (101) at a solid angle 38.4 / (4 p L L) is 1mW. Accordingly, even when the image projection device (100) is observed from the position where the image is projected, safety is assured in the range and it is possible to improve safety.

Description

technical field [0001] The present invention relates to an image projection device and a rear projection display device for projecting an image by laser light. Background technique [0002] As large-screen display devices, image projection devices and rear projection display devices are well known. Conventionally, a high-pressure mercury lamp has been used as a light source, but in recent years, development of an image projection device using laser light of three primary colors has been progressing in view of good color reproducibility and low power consumption. On the other hand, since laser light is monochromatic light with a neat wavefront, when it enters the human eye, it will converge at one point on the retina, which may damage the retina. Therefore, regarding products that use lasers, classify laser products according to the international standard IEC60825 and JISC6802:2005 in Japan, and set guidelines that manufacturers and users should follow for each class to impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00G03B21/10G03B21/14
CPCH04N9/3161H04N9/3197G03B21/28G03B21/10H04N9/3141H04N9/3129
Inventor 伊藤达男山本和久
Owner PANASONIC CORP
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