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Discharge lamp lighting device and projector

A technology for image display and lighting devices, which can be used in projection devices, lighting devices, electric light sources, etc., and can solve problems such as image quality degradation

Active Publication Date: 2014-11-05
PANASONIC CORP
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  • Summary
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Problems solved by technology

[0013] However, in the method disclosed in Patent Document 1, in order to compensate for the skew of the discharge polarity, the switching operation of polarity inversion is intermittently ignored, and there is a period and length of the ignored switching operation, which may cause accompanying damage to the projected image. When the image quality deteriorates, such as flickering with reversed polarity

Method used

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  • Discharge lamp lighting device and projector
  • Discharge lamp lighting device and projector
  • Discharge lamp lighting device and projector

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Embodiment approach

[0030] figure 1 It is a block diagram showing the configuration of a discharge lamp lighting device and a projection type image display device according to an embodiment of the present invention.

[0031] The projection type image display device 1 is equipped with an image processing unit 3 for performing IP (Interlace-Progressive) conversion for driving the DMD element 5 for the image signal (for example, reproduced image of DVD) input to the image input terminal 2, Image processing such as resize, frame rate conversion, gamma compensation, etc.; DMD drive section 4, which is used to drive DMD element 5 with the output image signal of image processing section 3; discharge lamp 6; color wheel 7; rod integrator 8, which is used to make the brightness distribution uniform; a reflector 9; a projection lens 10; a motor 11, which rotates the color wheel 7; a motor driving part 12, which is used to synchronize the rotation of the color wheel 7 with an image signal; a position senso...

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Abstract

The polarity of a voltage applied to the electrode pair is inverted by a changing signal generated at every boundary area of each filter color of the color wheel, and also in the blue color region (B) (a, b. c). Herewith, time during which the lamp electrode is positive and that negative is equal to each other every time the color wheel makes two rotations (T), thereby maintaining the heat load to be evenly distributed between both of the electrodes.

Description

technical field [0001] The present invention relates to a discharge lamp lighting device for lighting a high-intensity discharge lamp used in a projection-type image display device, and a projection-type image display device using the discharge lamp lighting device. Background technique [0002] As a projection type image display device (hereinafter simply referred to as "projector"), there are: a liquid crystal projector that obtains a projected image through the transmitted light of a liquid crystal display element, and a reflective device element (reflective device) such as a DMD (Digital Micro-mirror Device) element. A DLP (Digital Light Processing) (registered trademark) projector that projects an image from the reflected light of the mirror device element. Regardless of the type of projector, the white light from the white light source is decomposed into three primary colors (red: R, green: G, blue: B) through optical devices such as prisms and irradiated on the displa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/14G03B21/20
CPCG03B21/2026G03B21/2053
Inventor 植田晃加藤健太郎行天敬明
Owner PANASONIC CORP
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