Projection map display device

Abstract

A projection map display device is composed of rough filters configured in sequence at air feed direction for shading large-granule dust, a dust charge section composed of a discharge electrode and a relative electrode, a dust collection section composed of a high-voltage electrode collecting charged dust for the dust collection section and the dust collection electrode, a main filter mechanically sucking dust form air of the collection section and a fan blowing fed air, the fan is used for cooling a part of the illumination optical system members and a map display element. Further, conductive treatment is applied to the map display element and a part of the surface of the optical members to move the charge without conglutination even in condition that duct ionized and activated by the electric dust collection device passes through the main filter and contacts with the illumination optical system members composed of the map display element and optical members, thereby carrying out electric grounding treatment with the an electronic circuit.

Description

technical field [0001] The present invention relates to a projection-type image display device, which has an image display element and an illumination optical system. The light beam obtained by the illumination optical system is modulated by the image display element, and the image is projected on the screen, such as a liquid crystal projection device and a reflector type image display projection device, especially if an electric dust collection device and a mechanical dust removal filter or a mechanical dust removal filter and an electrostatic dust removal filter are installed at the air inlet for cooling the illumination optical system and the image display element Projection type image display device. Background technique [0002] The projection type image display device has the following structure, that is, the light beam emitted from the light source is modulated by the image display element, that is, the liquid crystal panel or the reflection type liquid crystal panel,...

AI Technical Summary

Problems solved by technology

In the air blower equipped with this electrostatic dust collection mechanism, the dust ionized by one electrode is attracted and adsorbed by Coulomb force on the grid-shaped other electrode, but in order to improve the capture rate, the distance between the electrodes, Appropriate parameter settings for shape and applied voltage, however, it is extremely difficult to capture 100% of dust with different sizes and compositions

[0008] It can be clearly seen from the experimental results that the dust that invades the interior of the device through the air supply device equipped with an electric dust collection mechanism is ionized by the action of the above electric dust collection mechanism. State snapping can lead to serious performance issues such as reduced brightness, bright spots, and color mottling of projected images

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