WO2006003903A1

WO2006003903A1 - Liquid crystal projector, and liquid cooler for its liquid crystal panel

Info

Publication number: WO2006003903A1
Application number: PCT/JP2005/011856
Authority: WO
Inventors: Takashi Naganawa; Rintaro Minamitani; Masakazu Hoshino; Shigeo Ohashi; Shuichi Terakado; Hiroaki Ikeda
Original assignee: Hitachi, Ltd.
Priority date: 2004-06-30
Filing date: 2005-06-28
Publication date: 2006-01-12
Also published as: JP2006017786A; TW200604713A

Abstract

A liquid crystal projector cooled efficiently by liquid cooling cycle in which disturbance of a video image is eliminated by removing bubbles in liquid refrigerant, and a liquid cooler for a liquid crystal panel. Light from a light source (112) is divided into three parallel rays which are passed through liquid crystal panels 101(R), 101(G) and 101(B) of R, G and B and subjected to intensity modulation. The modulated rays are subjected to color composition by a composition prism (119) and projected through a projection lens (127) to obtain a video image. In such a liquid crystal projector, each liquid crystal panel has channels (6, 7) of liquid refrigerant formed in contact with its liquid crystal panel area and further provided with a tank (200). The tank has outlets (205, 207) formed substantially in the center of the side face outer wall of the tank in the height direction so that bubbles are captured internally even if the device is arranged upside down to supply bubble-free liquid refrigerant. Alternatively, each liquid crystal panel (101) is provided with a curved part (141) for capturing bubbles formed at a part of its liquid refrigerant channel.

Description

Specification

Liquid crystal projector and liquid cooling device for the liquid crystal panel

Technical field

The present invention relates to a liquid crystal projector that projects light onto a screen through a liquid crystal panel called a light valve or a projection lens, and further uses a liquid crystal panel used in such a liquid crystal projector as a liquid. The present invention relates to a liquid cooling device for a liquid crystal panel for cooling with a refrigerant.

Background art

In recent years, for example, a projection apparatus (hereinafter simply referred to as “projector”) for enlarging and displaying a color video screen or the like on a personal computer can also obtain a light source power such as a metal halide lamp. The light is decomposed in three directions, the light intensity is modulated via the liquid crystal panels for the three primary colors R, G, and B, and these are synthesized by a color synthesis prism, etc., and then via a projection lens, etc. Devices that project onto screens have become widespread and practical.

[0003] It should be noted that in such a projector, in order to increase the definition of the obtained projection screen, the number of pixels of the liquid crystal panel is increased (high definition), and further, the display screen is enlarged. Therefore, the illuminance of the light source lamp (for example, a 250 W or higher-powered metahalide lamp is used) is being promoted. For this reason, heat from such high illuminance light sources has become a problem. In particular, in the projector configured as described above, the light from the light source is applied to the liquid crystal panel for the three primary colors R, G, and B, and modulated and transmitted on the surface thereof. When the light intensity (brightness) of the source increases, the heat generation in these liquid crystal panels also increases, and the characteristics of the liquid crystal panels are not adversely affected.

[0004] By the way, conventionally, in such projectors, an air cooling fan is generally used in order to prevent an increase in temperature in each part (particularly, a lamp, a control unit, etc.) of the apparatus including the liquid crystal panel and to prevent adverse effects thereof. In this way, cooling air is introduced and circulated from the outside of the device into the housing. However, as described above, in recent years, light emitting sources in recent years As the light intensity of the power increases, it has become difficult to sufficiently suppress the heat generation in the liquid crystal panel only by introducing and circulating the cooling air by the above-described air cooling fan.

[0005] Therefore, for example, a space is formed inside the polarizing plate and a glass panel facing the polarizing plate, and a liquid refrigerant such as water is sealed inside the space, and heat generated from the liquid crystal panel is used. A method has been proposed in which the enclosed liquid refrigerant is circulated inside the space, thereby suppressing the temperature rise due to light reception of the liquid crystal panel and protecting the liquid crystal panel from adverse effects due to the temperature rise.

However, considering the heat generation of the liquid crystal panel accompanying the remarkable increase in the light intensity (brightness) of the light source in the projector in recent years, the cooling by the above-described conventional technology is still insufficient. It was. Therefore, for example, as known in the following Patent Documents 1 to 4, a liquid refrigerant flow path is formed in the liquid crystal panel for the three primary colors G and B, and a heat exchange is provided outside thereof. A cooling cycle that circulates a liquid refrigerant using a circulation pump and circulates a liquid refrigerant such as water in this cooling cycle, thereby achieving higher efficiency cooling in the liquid crystal panel. Already known. In particular, in Patent Document 4, a circulation path of liquid refrigerant is formed around the liquid crystal panel to cool the surrounding force, and further, a circulation path of a light emitting source is also formed. The entire projector is cooled by a cooling cycle.

Patent Document 1: Japanese Patent Laid-Open No. 1159684

Patent Document 2: JP-A-5-216016

Patent Document 3: Japanese Patent Application Laid-Open No. 5-264947

Patent Document 4: JP-A-11-282361

Disclosure of the invention

Problems to be solved by the invention

[0008] As described in detail above, in a conventional projector, in order to realize more efficient cooling, particularly as the light source intensity (brightness) has increased remarkably in recent years, there is no liquid in the liquid crystal panel. In addition to forming a refrigerant flow path, a heat exchanger and a circulation pump are provided outside to form a cooling cycle, and liquid refrigerant is circulated in this cooling cycle to cool it. A method has been proposed. However, in the projector described above, in particular, in the case where the liquid refrigerant flow path is formed in contact with the liquid crystal panel area, which is the display surface of the liquid crystal panel, which is greatly adversely affected by heat generation, the cooling cycle is not changed. When bubbles or the like are generated inside the circulating liquid refrigerant and reach the liquid crystal panel area of the liquid crystal panel, the light transmitted through the liquid crystal panel is blocked or refracted, and then projected. The image projected on the screen through the lens will be disturbed, which will have an adverse effect.

On the other hand, in the projector according to the above-described prior art, for example, the cooling structure known from Patent Document 4, the circulation path of the liquid refrigerant is formed only around the liquid crystal panel area of the liquid crystal panel. As a result, it is possible to avoid the adverse effects caused by the bubbles generated in the liquid refrigerant described above, but the increase in the temperature of the liquid crystal panel due to a significant increase in the light source intensity (brightness) is achieved. It is difficult to cool efficiently. Further, in the projector disclosed in Patent Document 2 described above, there is known a projector that captures and removes the flow force of bubbles generated in the liquid refrigerant by forming a bubble chamber in a part of the flow path. However, in such a bubble chamber, for example, when the projector is disposed upside down, it is impossible to capture and remove bubbles from the structure, and furthermore, the bubbles trapped in the bubble chamber Again, the liquid refrigerant is mixed in the flow of the liquid refrigerant, and therefore, there is a problem that the image transcribed on the screen is disturbed. That is, the projector is generally not only installed and used on a desk, but is often used by being suspended from or attached to the ceiling, for example. It does not provide a practical structure, including the actual usage of

[0010] Therefore, the present invention has been made in view of the above-described problems in the prior art, and in particular, the liquid crystal panel is efficiently cooled using a liquid cooling cycle in which a liquid refrigerant is circulated. In particular, even a liquid crystal projector having a configuration in which a flow path through which a liquid refrigerant flows can be formed in contact with the light-transmitting surface of the liquid crystal panel to efficiently cool the liquid crystal panel, and as described above. Regardless of the actual usage condition, it is possible to reliably capture and remove bubbles generated in the liquid cooling cycle, so that the cooling flow of the liquid refrigerant can be reliably removed. To get high quality projection images An object of the present invention is to provide a liquid crystal projector that can be used, and a liquid-cooling device for the liquid crystal panel.

Means for solving the problem

In order to achieve the above object, according to the present invention, first, a light source, an optical element that divides the light from the light source into three lights as parallel light, and the optical element divided by the optical element 3 Three kinds of liquid crystal panels that transmit light of a book and modulate the intensity thereof, light synthesis means for synthesizing three lights that have passed through the three kinds of liquid crystal panels and modulated their intensity, and the light synthesis means A liquid crystal projector comprising a liquid cooling cycle including a pump and a radiator that circulates and cools liquid refrigerant in the three liquid crystal panels together with projection means for projecting the three synthesized lights. The panel is provided with a liquid refrigerant flow path in contact with the liquid crystal panel region, and further includes a tank for storing therein the liquid refrigerant circulating in the liquid cooling cycle. The discharge port Liquid crystal projector formed on substantially central portion in the height direction of the tank outer side wall is provided.

[0012] According to the present invention, in order to achieve the above-mentioned object, there is also provided a cooling device for a liquid crystal panel for a liquid crystal projector for cooling the liquid crystal panel for a liquid crystal projector with a liquid refrigerant, wherein the liquid crystal A liquid refrigerant flow path is formed in the panel in contact with the liquid crystal panel region, and further, a radiator for radiating the heat received in the liquid crystal panel to the outside and the liquid refrigerant are driven to A pump that circulates in a liquid cooling cycle including a liquid crystal panel and the radiator; and a tank that stores therein a liquid refrigerant that circulates in the liquid cooling cycle. The tank has a discharge port. In addition, a liquid crystal panel cooling device formed at a substantially central portion in the height direction of the tank side wall is provided.

In the present invention, in the liquid crystal projector or the liquid crystal panel cooling apparatus described above, the tank for storing the liquid refrigerant circulating in the liquid cooling cycle is provided in the pump. It is attached adjacent to the surface on which the suction port and the discharge port are provided, and the interior is separated into left and right rooms by a separation wall, or for meandering the liquid refrigerant in the interior A plurality of partition plates are provided, and the plurality of partition plates are arranged in a shape that forms substantially the same meandering channel even when the tank is placed upside down. It is preferable. Or the liquid-cooled rhino The tank that stores the liquid refrigerant circulating in the interior of the vehicle may be provided with a mesh member that adheres to the surface the bubbles mixed in the liquid refrigerant flowing into the tank.

[0014] Further, according to the present invention, in the liquid crystal projector or the liquid crystal panel cooling device described above, instead of the tank, a part of the upstream and downstream of the flow path is respectively provided. A curved portion that captures bubbles may be formed.

The invention's effect

As is apparent from the above, according to the liquid crystal projector of the present invention, and further to the liquid crystal panel cooling apparatus therefor, a liquid cooling cycle in which a liquid refrigerant is circulated is used. The liquid coolant can be efficiently cooled by flowing the liquid refrigerant in contact with the translucent surface of the liquid crystal. It is possible to reliably capture and remove from the circulating flow of refrigerant, and to provide a liquid crystal projector that is excellent in cooling efficiency of the liquid crystal panel and can obtain a high-quality projected image. It has an extremely excellent effect.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, FIG. 3 shows an example of the entire structure of a liquid crystal projector provided with a liquid cooling device for a liquid crystal panel according to an embodiment of the present invention. In the figure, reference numeral 100 indicates a housing of the liquid crystal projector, and as is apparent from the figure, a light source, for example, a metal nitride lamp 112 is provided therein. The light from the light source 112 is parallel by the first lens array 113, the second lens array 114, the polarization conversion element 115, and the condenser lens 116 disposed at predetermined positions in the casing. The light is output in the presence of light. The parallel light is then guided to the first dichroic mirror 117, a part of which is transmitted therethrough, and is guided to the liquid crystal panel 101 (R) for R (red) through the first condenser lens 118. Therefore, the light intensity is modulated, and then reaches the light combining prism 119.

On the other hand, the light reflected by the first first mirror 117 is reflected by the surface of the first reflector 120 and enters the second dichroic mirror 121. The light reflected here is The light is guided to the G (green) liquid crystal panel 101 (G) through the second condenser lens 122, where the light intensity is modulated, and then reaches the light combining prism 119. Further, the light transmitted through the second chromic mirror 121 passes through the second reflecting mirror 123 and the relay lens 124 and is reflected by the surface of the third reflecting mirror 125, and passes through the third condenser lens 126 to B ( It is guided to the liquid crystal panel 101 (B) for blue), where the light intensity is modulated and reaches the light combining prism 119. The light whose intensity is modulated by the liquid crystal panels 101 (R), 101 (G), and 101 (B) for the three primary colors R, G, and B is synthesized by the light combining prism 119, and Further, the image is enlarged by a projection optical system 127 including a projection lens, and projected onto a screen (not shown), for example (see thin arrows in the figure).

Further, reference numeral 131 in the figure denotes a cooling fan unit including a fan and a motor that rotationally drives the fan, and as shown by a white arrow in the figure, the liquid crystal projector is External air is taken into the case through the air inlet 134 opened in a part of the case 100, and the electrical control of each part including the liquid crystal panel for R, G, B together with the heat dissipation unit 130 described later Then, the electric component unit 128 that drives is also cooled. Furthermore, as described above, as the display screen has been increased in size in recent years, the entrapped air has become highly illuminant. Therefore, the metal halide lamp 112, which is a high illuminance light source that has become a problem of heat generation. In addition, after cooling the first lens array 113, the second lens array 114, the polarization conversion element 115, and the condenser lens 116, which are arranged in the vicinity of the light source 112, they are formed on a part of the casing 100. The air is discharged to the outside through the opened air discharge port 135.

[0020] The liquid crystal panels 101 (R), 101 (G), and 101 (B) for the three primary colors R, G, and B will be described in detail later. A refrigerant passage is formed. Then, by the action of the electric pump 129 provided inside the casing 100 of the liquid crystal projector and having a tank in a part thereof, the liquid refrigerant is shown as indicated by the thick black arrow in the figure. Circulating the liquid crystal panel 101 (R), 101 (G), 101 (B) for R, G, B, electric pump 129, for example, heat dissipation unit 130 consisting of a radiator, through the piping that has been wound around the body Thus, a so-called liquid cooling cycle is formed.

Subsequently, in FIG. 1 attached, together with the electric pump 129 described above, a tank for temporarily storing the liquid refrigerant that is attached integrally therewith and circulates in the liquid cooling cycle. 200 is shown. Fig. 1 (a) shows the state force when the electric pump 129 and the tank 200 are separated.Fig. 1 (b) shows the state where the electric pump 129 and the tank 200 are assembled together. It is shown. As is apparent from these drawings, the electric pump 129 is provided with a suction port 136 and a discharge port 137 at a substantially symmetrical position at a substantially central portion in the height direction of one surface thereof. ing.

On the other hand, the tank 200 has a cubic shape having a surface substantially similar to one surface of the electric pump 129, and the inside thereof is partitioned into left and right rooms 202 and 203 by a separation plate 201. Yes. Port insertion ports 204 and 205 are formed symmetrically on the wall surface of the tank in contact with one surface of the electric pump 129, and the suction port 206 is formed on the wall surface facing these port insertion ports. And the discharge port 207 are formed symmetrically in the left-right direction and at a substantially central position in the height direction of the tank. In addition, as described above, the configuration in which the tank 200 is integrally attached to the electric pump 129 is particularly effective in using a relatively narrow space in the casing 100 of the liquid cooling projector to configure a liquid cooling cycle. It is possible to do.

Next, in FIG. 2 attached, the tank 200 is mounted in a liquid cooling cycle formed by a liquid cooling device for a liquid crystal panel in a liquid crystal projector, that is, the inside of the cycle is circulated therein. A state in which the liquid refrigerant is temporarily stored is shown. 2A shows a state where the liquid crystal projector is installed on a desk, for example. On the other hand, FIG. 2B shows a state where the liquid crystal projector is turned upside down, for example, on a ceiling. The attached state is shown. In these drawings, the surface of the liquid refrigerant indicated by the symbol S decreases with the period of use, for example, due to leakage from the piping, etc. However, the liquid refrigerant force is assumed to be replenished. However, in the state where the liquid crystal projector force is normally operating, the surface of the liquid refrigerant in the amount of liquid held in the tank 200 is shown.

As is apparent from these graphic powers, in the tank 200 having the above-described configuration, the liquid refrigerant that has flowed into the left and right rooms 202 and 203 temporarily stays in the interior thereof. The bubbles contained inside move upward due to the buoyancy and are collected on the coolant level (see B in the figure). On the other hand, to the outside of the tank 200, specifically, The liquid refrigerant discharged to the electric pump 129 via the port inlet 204 or to the heat radiating unit 130 (see FIG. 3 above) via the discharge port 207 Since the port 207 is positioned below the normal liquid level S, bubbles are removed from the liquid refrigerant discharged to the outside.

That is, after that, even if it passes through the flow path formed in the liquid crystal panel region in the liquid crystal panel 101 described above, the light transmitted through the liquid crystal panel is blocked or refracted, and then the projection lens. There is no adverse effect on the image that is shown on the screen through the screen. This state can also be seen from Fig. 2 (b) above, which shows the state that the top and bottom are reversed and attached to the ceiling. That is, by disposing the liquid refrigerant discharge port formed in the tank 200 at a substantially central part in the height direction of the tank, the liquid refrigerant taken out from the tank force is mixed into the liquid refrigerant and liquid-cooled. Air bubbles circulating in the cycle can be removed more reliably. In particular, as described above, by forming the liquid refrigerant inflow and discharge ports formed in the tank 200 on the left and right and up and down on the forming wall surface, various usage states of the tank can be obtained. In the same manner as described above, it is possible to reliably remove bubbles from the liquid refrigerant force to be taken out.

Next, FIG. 4 attached herewith shows a structure of a tank 200 ′ according to a modification of the present invention in the liquid-crystal panel liquid cooling apparatus described above. The tank 200 ′ is also used by being disposed in the middle of the liquid cooling cycle, but the 200 ′ has a partition plate 211 in its internal space so that its graphic power is also clear. A plurality of liquid refrigerants are arranged in a direction perpendicular to the flow direction of the liquid refrigerant, so that the liquid refrigerant flows while meandering. Each of the plurality of partition plates 211 is formed in a substantially “L” shape as shown in FIG. 4 (a), and the directions are alternately reversed. Are arranged.

[0027] According to the tank 200 'described above, the configuration described above is illustrated in FIG.

As shown in FIGS. 4 (b) and 4 (c) showing the -I cross section and the II cross section, the liquid refrigerant flowing into the inside through the inlet 206 is meandered by the plurality of partition plates 211. At that time, in the stagnation portion 212 formed at the corner, the mixed bubbles move upward by the buoyancy and are collected on the refrigerant liquid level S (see B in the figure). The same as above. In addition, the above-described configuration in which the plurality of “L” -shaped partition plates 211 are alternately arranged in the reverse direction allows the tank 200 ′ to be used as described above even when the tank 200 ′ is used with its top and bottom reversed. Similarly, the liquid refrigerant force bubbles flowing in the internal flow path are removed, so that liquid refrigerant in a good state with less air bubbles that adversely affect the projected image is supplied to the outside from the discharge port 204. Is possible. Note that the above-described structure that causes the liquid coolant to meander to eliminate bubbles mixed inside can also be applied to the left and right rooms 202 and 203 in the tank 200 shown in FIG. .

[0028] Subsequently, Fig. 5 attached further shows a structure of a tank 200 "which is another modified example of the tank 200 '. A plurality of tanks 200" are arranged inside the tank 200'. Instead of the partition plate 211 for giving the liquid refrigerant flowing in the interior thereof, a mesh 210 is disposed inside the partition plate 211. According to the tank 200 "having a powerful structure, the air bubbles mixed in the liquid refrigerant passing through the inside of the tank 200" are captured and removed by the mesh 220 of the partition plate. In the same manner as the tank 200 ', the tank 200 "also removes bubbles from the liquid refrigerant flowing in the internal flow path when the tank 200" is used with its top and bottom reversed. Accordingly, it is possible to supply a liquid refrigerant in a good state with a small amount of bubbles that adversely affect the projected image from the discharge port 204 to the outside. Note that the roughness of the mesh 220 occurs in the liquid refrigerant, and after remaining in the liquid refrigerant, the bubbles that are circulated together with the liquid refrigerant are considered. It is preferable to set the size corresponding to the size. More specifically, it may be preferable to employ a mesh that is rough enough to remove bubbles having a diameter of at least about 10 to 30 m.

Further, attached FIGS. 6 and 7 show a liquid cooling device for a liquid crystal panel according to another embodiment of the present invention. That is, in the liquid cooling device according to another embodiment, instead of the above tank, the bubbles that adversely affect the projected image are changed to the G, B liquid crystal panels 101 (R), 101 (G), 101 (B) (see FIG. 3 above) is to be captured and removed inside each liquid crystal panel 101.

First, reference numeral 2 in FIG. 6 (a) showing a cross section of the liquid crystal panel 101 is a main component of the liquid crystal panel 101, and a number of transistor driving elements are formed on the surface thereof. A TFT substrate made of glass is shown. A counter substrate 1 made of glass is also arranged opposite to the TFT substrate, and liquid crystal 3 is enclosed between the transparent substrates 2 and 1. Thus, the liquid crystal panel 101 which is one of the three primary colors R, G or B is formed.

[0031] Further, reference numerals 4 and 5 in the figure are so-called protective glass plates, which are provided on the incident side and the emission side of the liquid crystal panel 101, respectively. The liquid refrigerant channels 6 and 7 are formed. A case 14 that surrounds the counter substrate 1, the TFT substrate 2, and the protective glass plates 4 and 5 to form a frame is attached. 6 (b) As is apparent, a channel having a curved portion 141 that is continuous with the channel and curved in the vertical direction is formed in a part of the channel. That is, according to the liquid crystal panel 101 having a powerful structure, the liquid refrigerant flowing in the flow paths 6 and 7 captures and stores bubbles mixed therein in the curved portion 141, so that the inside of the flow path The liquid refrigerant flowing through the air also removes the bubbles, reducing the amount of bubbles that adversely affect the projected image. Note that it is obvious that even if this is arranged upside down, bubbles can be removed from the flowing liquid refrigerant by the curved portion 141 formed in a part of the flow path in the same manner as described above. It is.

[0032] In this liquid crystal panel 101, the channels 6 and 7 are provided on both sides of the panel including the display area (translucent surface) of the liquid crystal panel, as shown in FIG. 6A. Since the liquid crystal panel is formed in contact with the liquid crystal panel, the liquid crystal panel can be cooled with high efficiency. Further, in this example, the liquid refrigerant is introduced or led out into the flow paths 6 and 7 in the liquid crystal panel 101. This is particularly advantageous when installing refrigerant piping in a narrow housing of a liquid crystal projector.

Further, in FIGS. 7 (a) and 7 (b), the force showing the structure of the modified example of the liquid crystal panel described above is shown. As shown in FIG. The arrangement of the lead-out pipes 12 and 13 differs from the structure shown in FIG. That is, in the liquid crystal panel shown in FIG. 7, the introduction / outlet pipes 12 and 13 are arranged on the upper and lower end faces of the case 14.

As described above, in the liquid cooling device for the liquid crystal panel in the liquid crystal projector according to the present invention, the liquid that circulates bubbles that adversely affect the projected image within the liquid cooling cycle. In order to remove from the refrigerant, the tanks 200, 200 ′, 200 ”whose detailed configuration has been described above are adopted, or instead of the tanks, the curved portions 141 are provided in the liquid crystal panels 101 as described above. However, the present invention is not limited to only one of these, and may employ both of the above-described configurations. It is possible to exert a better bubble removing function from the liquid refrigerant.

[0035] Power! As the liquid refrigerant flowing through each of the flow paths, for example, water mixed with an antifreeze liquid such as ethylene glycol or propylene glycol in part, or light-transmitting, inert and foamed. For example, a fluorinated inert liquid (perchlorocarbon) represented by Fluorinert (trademark of Sumitomo 3M Co., Ltd.) having a little electrical insulation can be used. In particular, when the latter liquid is used, it is possible to effectively prevent deterioration of the projection screen due to air bubbles mixed in the liquid refrigerant flowing through the flow path in the liquid crystal panel region. Further, in particular, the surface of various substrates forming the channels 6 and 7 of the flat and high resistance liquid crystal panel region having the thickness “d” is processed to maintain hydrophilicity, for example, a thin film of titanium oxide. It is preferable to coat. According to this, since the wall surface is always kept hydrophilic by the photocatalytic action of titanium dioxide by the light having the above-mentioned lamp power, it is possible to suppress the adhesion of dirt and bubbles on the wall surface. It becomes possible.

Brief Description of Drawings

FIG. 1 is a perspective view showing the separation and assembly state of an electric pump and a tank constituting a cooling device for a liquid crystal panel in a liquid crystal projector according to an embodiment of the present invention.

FIG. 2 is a view showing a cross section in a normal arrangement and a reverse arrangement in order to explain the state of the liquid refrigerant in the tank.

FIG. 3 is a block diagram showing an example of the entire structure of a liquid crystal projector provided with a liquid cooling device for a liquid crystal panel according to one embodiment of the present invention.

FIG. 4 is a perspective view showing a modified example of the tank shown in FIGS. 1 and 2, and its II and IV-II sectional views.

5 is an internal perspective view showing a modified example of the tank shown in FIG. FIG. 6 is a plan sectional view and a side sectional view showing a configuration of a liquid crystal panel in a liquid crystal panel cooling structure according to another embodiment of the present invention.

FIG. 7 is a plan sectional view and a side sectional view showing a configuration as a modification of the liquid crystal panel shown in FIG.

Explanation of symbols

101 LCD panel

129 pump

130 Rajeta

200, 200 ', 200 "tank

211 Partition

220 mesh

14 Frame case

141 Curved part of flow path

Claims

The scope of the claims

[1] A light source, an optical element that splits light from the light source into three lights as parallel light, and three types of liquid crystals that transmit the three lights split by the optical element and modulate the intensity thereof A panel, a light combining means for combining the three light beams transmitted through the three liquid crystal panels and modulating the intensity, and a projection means for projecting the three lights combined by the light combining means, In a liquid crystal projector having a liquid cooling cycle including a pump and a radiator that circulates and cools the liquid refrigerant in the three liquid crystal panels.

Each liquid crystal panel has a liquid refrigerant flow path formed in contact with the liquid crystal panel region, and further includes a tank for storing the liquid refrigerant circulating in the liquid cooling cycle. ,

The liquid crystal projector, wherein the tank has a discharge port formed at a substantially central portion in the height direction of the outer side wall of the tank.

[2] In the liquid crystal projector according to claim 1, the tank that stores therein the liquid refrigerant circulating in the liquid cooling cycle is provided with an inlet and an outlet of the pump. A liquid crystal projector that is mounted adjacent to a surface and separated into left and right rooms by a separation wall.

[3] In the liquid crystal projector according to claim 1, the tank that stores therein the liquid refrigerant circulating in the liquid cooling cycle is a partition for meandering the liquid refrigerant therein. A plurality of plates are provided, and the plurality of partition plates are formed and arranged so as to form substantially the same meandering flow path even when the tank is arranged upside down. A liquid crystal projector characterized by

[4] In the liquid crystal projector according to claim 1, the tank that stores the liquid refrigerant circulating in the liquid cooling cycle is stored in the tank, and the liquid refrigerant that flows into the tank is stored in the tank. A liquid crystal projector characterized in that a mesh-like member that attaches mixed air bubbles to the surface is attached.

[5] A light source, an optical element that splits the light from the light source into parallel light into three lights, and three types of liquid crystals that transmit the three lights split by the optical elements and modulate their intensity Panel and three light beams that are transmitted through the three liquid crystal panels and modulated in intensity. And a liquid cooling cycle including a pump and a radiator that circulates and cools the liquid refrigerant in the three types of liquid crystal panels, together with the projecting means for projecting the three lights synthesized by the photosynthesis means In a liquid crystal projector equipped with

Each liquid crystal panel has a liquid refrigerant channel formed in contact with the liquid crystal panel region, and a curved portion that captures bubbles is formed in a part upstream and downstream of the channel. LCD projector characterized by.

[6] A cooling device for a liquid crystal panel for a liquid crystal projector for cooling the liquid crystal panel for a liquid crystal projector with a liquid refrigerant, and the liquid crystal panel has a liquid refrigerant channel formed in contact with the liquid crystal panel region. And a radiator for radiating heat received in the liquid crystal panel to the outside, a pump for driving the liquid refrigerant and circulating it in a liquid cooling cycle including the liquid crystal panel and the radiator, And a tank that stores therein a liquid refrigerant that circulates in the liquid cooling cycle. The tank has a discharge port formed at a substantially central portion in the height direction of the outer wall of the tank side surface. Liquid crystal panel cooling device.

[7] The cooling device for a liquid crystal panel according to claim 6, wherein the tank for storing therein the liquid refrigerant circulating in the liquid cooling cycle is provided with a suction port and a discharge port of the pump. A cooling device for a liquid crystal panel, which is mounted adjacent to and separated into left and right rooms by a separation wall.

[8] The liquid crystal panel cooling device according to claim 6, wherein the tank for storing the liquid refrigerant circulating in the liquid cooling cycle has a partition plate for meandering the liquid refrigerant therein. A plurality of the partition plates are formed and arranged in a shape that forms substantially the same meandering channel even when the tank is arranged upside down. A cooling device for a liquid crystal panel.

[9] In the cooling device for a liquid crystal panel according to claim 6, the tank that stores therein the liquid refrigerant circulating in the liquid cooling cycle is used as the liquid refrigerant flowing into the inside thereof. A cooling device for a liquid crystal panel, wherein a mesh-like member for adhering mixed air bubbles to the surface is attached.

[10] Liquid crystal projector for cooling liquid crystal panel for liquid crystal projector with liquid refrigerant The liquid crystal panel is provided with a liquid refrigerant passage formed in contact with the liquid crystal panel region, and further for radiating the heat received in the liquid crystal panel to the outside. A radiator, and a pump that drives the liquid refrigerant and circulates it in a liquid cooling cycle including the liquid crystal panel and the radiator. Each liquid crystal panel is in contact with the liquid crystal panel region. A cooling device for a liquid crystal panel, wherein a flow path for liquid refrigerant is formed, and curved portions that capture air bubbles are formed in upstream and downstream of the flow path, respectively.