Laser image formation device

A laser and image technology, applied in lasers, projection devices, image communication, etc., can solve problems such as changes, image degradation, brightness, etc., and achieve the effect of reducing the number

Inactive Publication Date: 2008-09-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the laser output from each laser emitting unit is changed in a time-division manner during image display, since the overall light intensity changes, the brightness of the image changes, and there is a problem that image degradation (brightness change) occurs.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0088] FIG. 1 shows a schematic configuration diagram of a laser image forming apparatus according to Embodiment 1 of the present invention.

[0089] In Fig. 1, the laser light emitted from the red laser light source 1a, the green laser light source 1b, and the blue laser light source 1c is converged by the condenser lenses 9a, 9b, 9c, and passes through the expander optical system 2 and the integrator optical system. (Uniform Illumination) 3. Light beams are shaped to have a uniform light intensity distribution, and the light is irradiated onto the diffuser plates 10a, 10b, and 10c in order to remove speckle noise. The laser light diffused by the diffusion plates 10a to 10c illuminates the spatial light modulators 5a, 5b, and 5c formed of, for example, liquid crystal panels to form a two-dimensional image. The light passing through the spatial light modulation elements 5 a , 5 b , and 5 c is synthesized by a dichroic prism 6 and projected onto a screen 8 through a projection ...

Embodiment approach 2

[0119] In the laser image forming apparatus according to Embodiment 2 of the present invention, in order to reduce the burden imposed on the laser light emitting unit by always performing laser output detection in Embodiment 1, a laser light is generated in one of the laser light emitting units of each laser light source. In case of abnormality / defect, laser output detection is performed.

[0120] In the laser image forming apparatus according to Embodiment 2, a predetermined laser drive current value is set in advance in each stripe of the multi-stripe semiconductor laser, and when the drive current of each stripe exceeds the set predetermined laser drive current value, In this case, the output of laser light is detected.

[0121] In the laser image forming apparatus according to the second embodiment, the difference from the first embodiment is the optical system of the laser light sources 1a, 1b, and 1c of the respective colors, and only the different parts will be describe...

Embodiment approach 3

[0142] In the laser image forming apparatus according to Embodiment 3 of the present invention, image formation is performed by emitting laser light from each laser light source in a field sequential manner using one spatial light modulation element. In this laser image forming apparatus, according to Field-sequential emission timing detects the output of laser light sources of colors that are not displayed, so that the degradation status of each laser light source can be grasped at the same time while providing clear images without brightness changes and image degradation.

[0143] FIG. 7 shows a schematic configuration diagram of a laser image forming apparatus according to Embodiment 3 of the present invention. The same reference numerals are used for the same parts as those in FIG. 1 , and description thereof will be omitted.

[0144] In FIG. 7, the light emitted from the red laser light source 1a, the green laser light source 1b, and the blue laser light source 1c is conv...

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PUM

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Abstract

A laser image formation device forms an image by applying light emitted from a plurality of laser light sources (1a, 1b, 1c), each of which can obtain a single color by laser beams outputted from a plurality of laser light emitting units, to spatial light modulation elements (5a, 5b, 5c). Each laser light source of the plurality of laser light sources (1a, 1b, 1c) detects an output of laser light emitted from each of the laser light emitting units according to a modulation input signal for modulating the spatial light modulation elements. Thus, it is possible to know the degradation degree of each of the laser light emitting units without degrading the image projected on the screen or without separating the lights synthesized.

Description

technical field [0001] The invention relates to a laser image forming device which uses a laser light source to create an image. More specifically, it relates to a laser image forming apparatus that forms an image using a light source that detects and controls the light intensity of a plurality of laser beams emitted from a plurality of lasers. Background technique [0002] Fig. 11 shows a schematic structure of a laser display. The light from the laser light sources 101 a to 101 c of RGB three colors (R: red, G: green, and B: blue) first passes through an expander optical system 102 for beam expansion. Next, the expanded laser light is beam-shaped by an integrator optical system 103 composed of a lens and a small lens array so as to uniformly irradiate the spatial light modulation elements 105a to 105c. Laser light is modulated in intensity by spatial light modulators 105 a to 105 c according to an input image signal, and synthesized by a dichroic prism 106 . The intensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14G03B21/00H01S5/00
CPCH01S5/06808H01S5/0683H01S5/4025H04N9/3105H04N9/3155H04N9/3161H04N9/3194G03B21/2013G03B21/2033G03B21/2053G03B33/06G03B33/08
Inventor 森川显洋笠澄研一水岛哲郎山本和久门胁慎一
Owner PANASONIC CORP
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