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Projection type image display device

An image display device, projection technology, applied in projection devices, combined devices, external electrostatic separators, etc., can solve problems such as clogging and long-term difficulty in filter replacement time, achieve cost reduction, maintain dust collection performance, The effect of restraining the external dimensions of the device

Active Publication Date: 2010-03-31
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, although the electrostatic filter can capture fine dust, if a lot of large dust is attached, it may cause clogging earlier than the decrease in the electrostatic adsorption capacity.
In particular, in an environment with a lot of dust in the size of tens of microns or in a harsh environment with a lot of dust in the size of hundreds of microns, it is difficult to prolong the targeted filter replacement time.

Method used

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Experimental program
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Effect test

no. 1 approach

[0034] The overall planar structure of the projection type image display device according to the first embodiment of the present invention is as follows: figure 1 shown. The present invention is not a proposal about an optical structure, and the optical structure is a common structure, so it will be briefly described below.

[0035] In the figure, the light emitted from the light source 101 is emitted only forward by the reflector 102 and enters the optical unit 103 .

[0036] The incident light incident on the optical unit 103 passes through the dichroic mirrors 104, 105, total reflection mirrors 106, 107, 108, and is separated into red, green, and blue lights, and then passes through the incident side polarizers 109R, 109G, 109B, and the liquid crystal panel 110R. , 110G, 110B, and output-side polarizing plates 111R, 111G, and 111B receive intensity modulation according to an external input signal (not shown).

[0037] These lights are combined on one optical path by the c...

no. 2 approach

[0080] Figure 4 Another form of the external filter of the projection type image display device according to the second embodiment of the present invention is shown. Other structures and the first embodiment figure 1 are the same, and therefore, description thereof is omitted.

[0081] In the projection type image display device of the present embodiment, only one type of urethane filter is used for the external filter unit 145 . Specifically, the same type of filter 146 as the first filter 140 with a relatively large mesh size used in the projection-type image display device in the first embodiment described above is used.

[0082] However, the filter 146 of the projection type image display device of this embodiment is thicker than the first filter 140 used in the first embodiment, and satisfies the conditions required for the external filter described in the first embodiment ( 1) ~ (3).

[0083] As mentioned above, in order to satisfy the above conditions (1) to (3), b...

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Abstract

The invention aims to provide a projection type image display device which suppresses the pressure loss to the minimum without influencing suction of outside air for cooling, and is capable of capturing relatively large dust and captures dust for a long time without overhaul. The projection type image display device comprises a housing (118) provided with an inlet opening (119) and an outlet opening (124), a powder dust capture part (120), and a suction fan (117) as an air supply part, wherein the powder dust capturer part (120) is capable of updating built-in electrostatic filter in a form ofa roll, at the outside of the inlet opening (119) of the powder dust capture part (120), an inner housing (139) and an outer housing (142) for holding a fixing polyurethane filter(140,141) are detachably arranged in the housing (118).

Description

technical field [0001] The present invention relates to a projection type image display device with a dust removal function, in particular to a projection type image display device with a function of automatically updating a dust capture filter. Background technique [0002] Conventionally, projection-type image display devices such as projectors focus powerful light from a light source such as a lamp onto an image display element such as a liquid crystal panel or a DMD (Digital Mirror Device), and modulate the light according to an image signal. , enlarge and project the image on the image display element to obtain a large screen. [0003] Here, the image display element irradiated with strong light, the light source itself, the power supply of the device, etc. generate a large amount of heat, and if they are not properly cooled, thermal damage will occur. Therefore, the projection type image display device adopts a structure in which outside air is introduced into the dev...

Claims

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Application Information

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IPC IPC(8): G03B21/00G03B21/14B01D50/00B01D46/10B03C3/04
Inventor 山岸成多
Owner PANASONIC CORP
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