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Image display device and light source unit therefor

An image display device and image display technology, applied in the field of high-level display, can solve the problems of brightness loss, low gray-level images difficult to display gray levels, etc., and achieve the effect of ensuring smooth gray levels and brightness

Inactive Publication Date: 2005-11-02
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned conventional technologies, it is difficult to perform smooth gray-scale display in low-gradation images, and there is a problem of brightness loss in high-brightness gray-scale images.

Method used

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  • Image display device and light source unit therefor
  • Image display device and light source unit therefor
  • Image display device and light source unit therefor

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Experimental program
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Embodiment Construction

[0015] The best mode for implementing the present invention will be described below with reference to the drawings.

[0016] Figure 1 ~ Figure 7 It is an explanatory diagram of the embodiment of the present invention. figure 1 It is a diagram of a configuration example of an image display device according to an embodiment of the present invention. Figure 2 ~ Figure 7 Yes figure 1 Examples of driving power waveforms of semiconductor light-emitting elements in the light source of the device.

[0017] figure 1 It is a diagram of a configuration example of a projection type image display device using a semiconductor light-emitting element as a light source. In this image display device, as the image display element, a DLP (Digital Light Processing) type image display element that modulates the irradiated light based on the reflection of a micromirror is used.

[0018] in figure 1 Here, 1 is a semiconductor light-emitting element, and 100 is a structure where a plurality of the ...

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PUM

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Abstract

A bright image with smooth grayscale is ensured. Semiconductor light emitting devices that separately emit red, green, and blue light are used as a light source. The peak values of power needed to cause the semiconductor light emitting devices to emit light are varied according to image grayscale during the period of one cycle of screen display.

Description

Technical field [0001] The present invention relates to an image display technology that irradiates an image display element with light from a light source side to form an optical image, and particularly relates to a technology related to gray scale display. Background technique [0002] As a prior art related to the present invention, for example, it is described in Japanese Patent Laid-Open No. 2004-37958 and Japanese Patent Laid-Open No. 2003-186110. Japanese Patent Laid-Open No. 2004-37958 describes the use of semiconductor light-emitting element LEDs that can emit different monochromatic lights as light sources, and the use of digital micro-mirror devices DMD for image display elements. The semiconductor light-emitting element LED is time-shared with the image signal. Operational structure; in Japanese Patent No. 2003-186110, it is described that light-emitting diodes emitting red, green, and blue light are used as light sources, and a DMD panel is used in the image display ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00G09F9/00G09G3/20G09G3/32G09G3/34H01L33/00H04N5/74H04N9/31
CPCG09G3/2025G09G2310/0235G09G2310/066G09G2320/064G09G3/3406G09G2320/0646G09G2320/0633
Inventor 山崎太志谷津雅彦
Owner HITACHI LTD