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Image projection apparatus and operation method thereof

A projection device and image technology, applied in projection devices, lighting devices, components of lighting devices, etc., can solve problems such as difficulties and achieve the effect of improving image quality

Inactive Publication Date: 2008-11-26
HITACHI MEDIA ELECTORONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing image projection device, the improvement of the image quality is only in the initial setting, and it is difficult to achieve a higher gray scale

Method used

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  • Image projection apparatus and operation method thereof
  • Image projection apparatus and operation method thereof
  • Image projection apparatus and operation method thereof

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Embodiment Construction

[0019] Hereinafter, embodiments of the image projection device and its operating method according to the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

[0020] FIG. 1 is a schematic diagram showing a configuration example of an image projection device according to the present invention. The image projection device includes a projection lens (lens) 2 , a color filter 3 , a reflective device 4 , a device control circuit 5 , a lamp 6 as a light source, and a lamp lighting power supply 7 . As the lamp 6, for example, a high-pressure mercury lamp can be used, and the light of the lamp 6 is emitted in a predetermined direction through a reflector. The lamp lighting power supply 7 is connected to the lamp 6 and supplies voltage, current, and power for lighting the lamp 6 .

[0021] The color filter 3 is a plurality of dichroic filters that selectively transmit wavelengths of visible light, a...

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Abstract

An image projection apparatus controls to vary at least one of current, voltage and power of a discharge lamp for each color segment by means of at least two control signals. When the discharge lamp reaches the stable state after turned on, the discharge lamp exhibits the constant voltage characteristic and an amount of light emitted from the lamp is varied in accordance with current or voltage applied thereto. The light amount of the lamp is varied to at least 3 stages simultaneously in accordance with an image signal in synchronism with color to be emphasized and weakened in each color (e.g. red, blue, green and white).

Description

technical field [0001] The present invention relates to an image projection device for displaying images by projecting images using a discharge lamp (lamp), and an operating method thereof. Background technique [0002] As technologies related to an image projection device that displays an image by projecting an image using a lamp, for example, there are the following Patent Document 1 (Japanese Patent Laid-Open No. 2004-212890 ) and Patent Document 2 (Japanese Patent Laid-Open No. 2006-349912 Bulletin). [0003] In the technique disclosed in Patent Document 1, light irradiated by a high-pressure discharge lamp lit by direct current passes sequentially through color segments obtained by dividing a color filter into a plurality, and the image In an operating method of a projection system projecting onto a screen, a pulse current is superimposed on a DC lamp current of a high pressure discharge lamp in synchronization with at least one specific color segment. [0004] Also, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14H05B41/36F21V14/08
CPCH04N9/3155G03B21/2053H04N9/3114H04N9/3123
Inventor 龟田幸广
Owner HITACHI MEDIA ELECTORONICS CO LTD