JP2585003Y2 - Liquid crystal cooler for liquid crystal projector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a liquid crystal projector which is a projection type display device using a liquid product display panel.

[0002]

2. Description of the Related Art In a liquid crystal projector, when light emitted from a light source passes through a polarizing plate and a liquid crystal panel, a part of the light is absorbed and converted into heat, thereby increasing the temperature. This causes problems such as deterioration of the polarizing plate, irregular operation of the liquid crystal panel, and breakage.

In order to prevent this, an air cooling system which takes in outside air into the housing, which is one of the prior arts, is used. In this case, an air filter is used to prevent dust mixed with the outside air from adhering to a liquid crystal panel or the like. Need. Most of the dust can be avoided by this air filter, but fine dust such as tobacco smoke and dust is mostly collected depending on the relationship between the air filter's collection performance and pressure loss. Can not do. Furthermore, the air filter to which most of the dust adheres makes it difficult to suck in the outside air, and as a result, the internal temperature rises, which may cause parts to be broken or fire.

As a countermeasure against such adhesion of tobacco smoke and dust, the liquid crystal projector case has a tightly-opened structure, the internal gas is stirred by a circulation fan, and the heat generated by the light source is provided around the light source. Heat is radiated from a cooling device provided outside the case via a heat absorber and a heat conductor (for example, Japanese Patent Application Laid-Open No. 2-130542), or a liquid crystal panel and a polarizing liquid are filled with a cooling liquid such as an ethylene glycol aqueous solution. was dipping like container made of Paris Rex glass has been considered (for example, JP 63-67979, JP-a-1
-302386).

As a cooling device for a liquid crystal panel, a cooling device using a refrigerant such as freon or water is closely attached to the liquid crystal panel, and the refrigerant is circulated by a fluid pump or compressed by a compressor to radiate heat from a radiator. (For example, Japanese Patent Laid-Open No. 1-1
59684, 1-314287), a space surrounded by a liquid crystal panel, a condenser lens, and a radiator is filled with a cooling liquid composed of ethylene glycol and glycerin, and the radiator is cooled by a cooling fan (for example, a cooling fan). JP-A-2-2
04682, 3-91716), a liquid crystal panel and a coolant are attached to the side of a closed cooling container, and the coolant is cooled by an electronic cooling element utilizing the Peltier effect (for example, Japanese Utility Model Application Laid-Open No. 1-29235). It is conceivable that a plurality of liquid crystal display units are connected to the air supply and exhaust ducts, and a heat pipe type heat exchanger and a blower are provided above and below the air supply and exhaust ducts to cool the liquid crystal panel of the liquid crystal display unit. (For example, see JP-A-63-27149).
0, 63-271491).

[0006]

For example, the liquid crystal projector disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 4-138418 "Liquid crystal display device" has a cooling medium and a liquid crystal panel housed in a transparent container, and the cooling medium is used. It adopts a configuration in which heat is removed from both sides of the liquid crystal panel by convection, and a cooling medium called florinate, which has electrical insulation, is provided by a circulation device provided outside the container that contains the liquid crystal panel, with a filter and a cooler. Is externally circulated through a flexible pipe connecting the two. However, in order to circulate the cooling medium outside the container accommodating the liquid crystal panel, an external circulation system for circulating the refrigerant inside and outside the container is indispensable. Therefore, there is a problem that a failure frequently occurs and an intended cooling effect may not be obtained. Further, in a "liquid crystal cooler of a liquid crystal projector" disclosed in Japanese Utility Model Application Laid-Open No. 1-29235, a cooling container in which a refrigerant is sealed is mounted on a side surface of a liquid crystal panel, and the refrigerant in the cooling container is converted into an electronic device utilizing the Peltier effect. A liquid crystal projector configured to be cooled by a cooling element is disclosed. However, this is characterized only in that heat exchange between the refrigerant and the outside air is performed by a thermoelectric cooling element utilizing the Peltier effect, and the refrigerant in the cooling container flows through the cooling container by natural convection. Therefore, there is a problem that the amount of heat exchanged between the refrigerant and the outside air is not sufficient, and the cooling effect cannot be expected so much.
The present invention solves the individual problems caused by dust of the liquid crystal projector to which the air filter is added as described above.
Without incorporating the outside air into the housing, and the outside air, the eye is to provide a liquid crystal Purojukuta with a cooler for performing only the heat transfer
It is the target .

[0007]

In order to achieve the above-mentioned object, the present invention provides a liquid crystal panel and a liquid crystal panel containing the liquid crystal panel.
Closed container filled with a refrigerant, and a wall of the container.
Fixed between the refrigerant and the outside air by the Peltier effect.
An electronic cooling unit that exchanges heat between
Facing the electronic cooling unit across the liquid crystal panel
Is disposed at a position where the refrigerant flows over the surface of the liquid crystal panel.
Supply the liquid to the electronic cooling unit through the container;
Reflux along the inner wall of the vessel and convection circulate in the vessel.
And a fan .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
explain. FIG. 1 shows a liquid crystal display of the liquid crystal projector of the present invention.
FIG. 2 is a schematic cross-sectional view showing an embodiment of a rejecter, and FIG.
Schematic cutaway showing the liquid crystal cooler of a liquid crystal projector viewed from the front
FIG. In FIG. 1, a cooling unit 9 including a heat absorbing fin 3, a heat radiating fin 4, and an electronic cooling unit 5 is mounted on a box 10 in which a light path system of light is secured by a condenser lens 1 and a polarizing plate 2. The medium 7 in the box is convected by the fan 6 and the heat generated in the liquid crystal panel 8 and the polarizing plate 2 is transmitted to the medium 7, and then the cooling unit 9 absorbs heat and radiates heat to the outside. FIG. 2 is a diagram when FIG. 1 is viewed from the front.

[0009]

[Effects of the Invention] As described above , according to the present invention,
A sealed container that houses a liquid crystal panel and is filled with a refrigerant
The electronic cooling unit is fixed to the wall of the vessel, creating a Peltier effect
More heat exchange between the refrigerant and the outside air,
Facing the electronic cooling unit with the LCD panel in the container
The fan located at the position
Liquid to the electronic cooling unit
Reflux along and convection circulation in the container
Therefore, the refrigerant convected and circulated by the fan first takes heat from the liquid crystal panel surface, flows into the electronic cooling unit in that state, and transmits the heat, so that the heat generated by the liquid crystal panel can be transmitted to the electronic cooling unit most efficiently, In addition, the refrigerant whose heat has been removed by the heat exchange with the outside air by the electronic cooling unit travels through the inner wall of the container and is returned to the fan, and can be used for cooling the liquid crystal panel again. This is the most efficient cooling method by convection circulation. The liquid crystal panel can be cooled by a good internal forced circulation system, and since the refrigerant is sealed in the container, there is no danger of contamination by dust.Therefore, unlike a conventional air-cooled liquid crystal projector using an air filter, In addition, the air filter may become clogged and the temperature inside the housing may rise, causing damage to internal components or fire. Excellent effects etc. are not, it is possible to compact and highly efficient cooling.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a liquid crystal cooler of the liquid crystal projector of the present invention.

FIG. 2 shows a liquid crystal cooler of the liquid crystal projector shown in FIG.
It is an approximate sectional view shown from the front .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Condensing lens 2 Polarizing plate 3 Heat absorbing fin 4 Heat radiating fin 5 Electronic cooling element 6 Fan 7 Medium 8 Liquid crystal panel 9 Cooling unit 10 Box 11 Partition plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/13-1/141 G03B 21/16 G09F 9/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A liquid crystal panel, and said liquid crystal panel is housed therein.
And a hermetically sealed container which is filled with a refrigerant and a wall of the container.
Fixed between the refrigerant and the outside air by the Peltier effect
An electronic cooling unit for performing heat exchange, and
A position facing the electronic cooling unit with the liquid crystal panel interposed
And the refrigerant passes through the surface of the liquid crystal panel.
Liquid to the electronic cooling unit, and
A fan that recirculates along the wall and convection circulates in the vessel
A liquid crystal cooler for a liquid crystal projector , comprising: