JPH0868978A - LCD projector - Google Patents

Abstract

(57) [Summary] [Object] In a liquid crystal projector, a single fan can efficiently cool a liquid crystal display element, an optical system component, a light source, and a power source for the light source. [Structure] Liquid crystal display module 2 including liquid crystal display panel
A liquid crystal projector 1 in which an optical system module 10 including a light source 11, a mirror 15, a projection lens 25, and the like, and a power source 5 for supplying electric power to the light source 11 are housed in a device case 5.
In the device case 2, the cooling air inlet 6 and outlet 9
And one fan 8 for generating cooling air is provided in the equipment case 2. A first air flow passage 30 is formed in the device case 2 from the suction port 6 to the optical system module 10 to the discharge port 9, and further, from the suction port 6 to the power source 5 for the light source and the discharge port. And a second air flow passage 40 leading to 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector, and more particularly to a cooling structure for a liquid crystal projector such as a liquid crystal projection television.

[0002]

2. Description of the Related Art Light from one light source is converted into an R (red) component,
The light is decomposed into three lights of G (green) component and B (blue) component, and the corresponding three liquid crystal display panels are irradiated, and each of the liquid crystal display panels is decomposed into three colors of R, G, and B and displayed. There is a three-plate type liquid crystal projector in which a color image such as a television image thus generated is combined by reflection and transmission and enlarged and projected on a screen by one projection lens. There is also a single-plate type liquid crystal projector using one liquid crystal display panel with a color filter.

Then, in the display window on the front surface of the case containing the light source, the liquid crystal display panel, the projection lens and the reflection mirror, there is provided the rear screen provided with the transmissive screen for enlarging and displaying the image displayed by the liquid crystal display panel by the projection lens. There is a liquid crystal projection television as a projection type projector device. Here, in a rear projection type projector device including such a liquid crystal projection television, a reflection mirror is arranged in a case so as to be oblique, and the image light passing through the projection lens is reflected by the reflection mirror to display a screen. Since the projection distance is enlarged and the linear distance between the screen and the projection lens can be shortened, the device becomes thin.

In the liquid crystal projector as described above,
Conventionally, a liquid crystal display element and a light source are cooled by providing a device case or a fan in the device case to suck the outside air into the device case or exhaust the air in the device case. Specifically, two fans are provided, that is, a cooling fan dedicated to a liquid crystal display module including a liquid crystal display panel and a cooling fan for a portion including other optical system components.

[0005]

However, as in the prior art, if a fan is used to simply suck the outside air into the equipment case or discharge the air inside the case, the fan cannot be operated. There was a problem that the liquid crystal display element and the light source were not cooled well, despite the ability.
This is because the inhaled outside air diffuses inside the case,
This is because sufficient cooling air does not reach the target point, and as a result, the liquid crystal display element and the light source cannot be cooled well. Further, conventionally, it is necessary to provide two fans, a cooling fan dedicated to the liquid crystal display module and a cooling fan for the other parts, which increases the cost accordingly.

An object of the present invention is to provide a liquid crystal display device, an optical system component, a light source,
It is to be able to efficiently cool the power source for each light source.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is a liquid crystal display module including a liquid crystal display panel for displaying an image, a light source for emitting light, and a light source for reflecting or reflecting the light emitted by the light source. An optical system module including a mirror that transmits the light and irradiates the liquid crystal display panel, a projection lens that projects the image light displayed on the liquid crystal display panel onto a screen, and a power supply that supplies power to the light source in a device case. In the liquid crystal projector housed in, a cooling air inlet and an outlet are formed in the device case, one fan for generating the cooling air is provided in the device case, and the optical system module is provided from the inlet. And a second air flow passage extending from the suction port to the discharge port via the power source. There.

According to a second aspect of the present invention, in the first aspect of the present invention, the first air flow passage is branched from the vicinity of the exhaust port side, and a part of the cooling air is surrounded by the light source. The structure is characterized in that an air guide passage is further formed that is introduced into the second air flow passage and then merges with the second air flow passage.

[0009]

According to the first aspect of the invention, in the device case of the liquid crystal projector, the cooling air generated by one fan flows from the suction port to the discharge port via the optical system module. And a second air flow passage that extends from the suction port to the discharge port through the power source for the light source, so that the liquid crystal display element, the optical system component, and the light source can be efficiently used by the cooling air flowing through the first air flow passage. Can be cooled and second
The power source for the light source can be efficiently cooled by the cooling air flowing through the air flow passage.

According to the second aspect of the present invention, the highest temperature is achieved by the cooling air flowing through the air guide passage that branches from the vicinity of the outlet of the first air flow passage and joins the second air flow passage. The light source can be cooled more efficiently.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid crystal projector according to the present invention will be described below with reference to FIGS. First, FIG. 1 shows a liquid crystal projection television as an example of a liquid crystal projector to which the present invention is applied. Reference numeral 1 is a liquid crystal projection television as a liquid crystal projector, 2 is a device case, and 3 is a screen. As shown in the figure, the liquid crystal projection television 1 is provided with a screen 3 for displaying a projection image from the rear side on the upper half of the front side of a vertically long device case 2.

2 and 3 showing the internal cooling structure of such a liquid crystal projection television 1, 5 is a power source, 6 is an inlet, 7 is an intake filter, 8 is a fan, 9 is an outlet, 10 Is an optical system module, 11 is a light source, 15 is a cold mirror, 16 is a cold filter, 21 is a liquid crystal display module, 22 is a liquid crystal display panel, 25 is a projection lens, 30 is a first air flow passage, 40
Is a second air flow passage. That is, as shown in FIG. 2, the power source 5 is installed on the pedestal 4 on the lower right side, and the optical system unit 10 is arranged from the left side to the upper side in the lower half of the device case 2. In addition, an intake port 6 that opens to the right side is formed in substantially the lower half of the device case 2, and an intake filter 7 that purifies the outside air and a fan that generates cooling air are formed inside the intake port 6. 8 are arranged in order, and a discharge port 9 opening to the left side surface is further formed.

The optical system module 10 comprises a light source 11, a cold mirror 15, a cold filter 16, a liquid crystal display module 21 and a projection lens 25. First, the light source 11 is provided on the lower left side in the lower half of the device case 2.
Is provided. The light source 11 includes a lamp 12 that emits white light at a focal portion of a reflector 13, and the lamp 12 is supplied with electric power from the power source 5. Further, the light source 11 is surrounded by a lamp house 14. As shown, the light source 11 is a lamp 1
The white light emitted from No. 2 is reflected by the reflector 13 and is irradiated rightward in the drawing, and the cold mirror 15 is arranged on the optical axis thereof. This cold mirror 15
Is a component that shields and removes the ultraviolet rays and heat rays of the white light from the light source 11 and removes them upward. Therefore, in the figure, it is arranged at an angle of 45 ° to the upper right.

The cold filter 16 and the liquid crystal display module 21 are arranged substantially horizontally on the optical axis reflected upward by the cold mirror 15.
Further, above the liquid crystal display module 21, a projection lens 25 that projects the image light transmitted through the liquid crystal display module 21 is arranged. Cold filter 16
Is a component that shields ultraviolet rays and heat rays of the light reflected by the cold mirror 15 and removes the components, and transmits the components upward. The liquid crystal display module 21 has a liquid crystal display panel 22 housed in a shield case (not shown). That is, the liquid crystal display panel 22 that displays an image by driving a liquid crystal display element has a liquid crystal display between two glasses. It is made by enclosing.

An incident side polarization plate 23 is attached in parallel to the lower surface side of the liquid crystal display module 21 in the drawing, and an emission side polarization plate 24 is attached to the upper surface side of the liquid crystal display module 21 in the drawing.
Are mounted in parallel. As described above, in the liquid crystal projection television 1, the light emitted from the light source 11 and reflected upward by the cold mirror 15 passes through the cold filter 16 and enters the liquid crystal display panel 22 of the liquid crystal display module 21, and the liquid crystal display element By driving, the image light transmitted through the liquid crystal display panel 22 is projected upward by the projection lens 25, and after being reflected by a reflecting mirror (not shown), a projected image is displayed on the screen 3 from the back side.

In the liquid crystal projection television 1 described above, as shown in FIGS. 3 and 4, the light source 1 which constitutes the optical system module 10 is provided in the lower half of the device case 2.
1, a cold mirror 15, a cold filter 16, a first air flow passage 30 for cooling the liquid crystal display module 21, and a second air flow passage 4 for cooling the power supply 5.
0 and 0 are formed. These first air flow passages 30
The second air flow passage 40 is configured to connect the intake port 6 opening to the right side surface of the lower half of the device case 2 and the exhaust port 9 opening to the left side surface of the lower half of the device case 2. .
Although not shown, an intake louver is attached to the intake port 6, and an exhaust louver is attached to the exhaust port 9. Further, in FIG. 4, the fan 8 is denoted by FAN, the optical system module 10 is denoted by OPM, the liquid crystal display module 21 is denoted by LCM, and the cold filter 16 is denoted by CF.

Further, as shown in FIG. 2, an oblique air guide plate 31 is arranged below the cold mirror 15 in parallel inside the equipment case 2. This baffle plate 31 is shown in FIG.
7 to 7, it constitutes a part of the optical system module case 32. The optical system module case 32 has a shape that covers the optical system module 10.
As shown in FIG. 5, a wall 33 is provided at a portion connected to the fan duct 8a and continuous with the baffle plate 31.
Openings 34, 34 are formed on both sides of 3.

Further, as shown in FIG. 6, an opening 36 is formed on one side of the wall 35 facing the discharge port 9, and an opening 37 is formed on the upper surface of the drawing which is opposite to the opening 36 and intersects with the wall 35. In addition, an opening 38 is formed in the upper part of the figure, which is continuous with the lamp house 14. As a result, an air guide path 39 is formed through the openings 37 and 38 to the outside of the optical system module case 32 and joins the second air flow path 40. As shown in FIG. 7, the air guide path 39 has walls 41, 4 provided on the upper surface of the lamp house 14 in the figure.
2, 43 are formed so as to surely travel around the lamp house 14.

As described above, since the liquid crystal projection television 1 as one type of liquid crystal projector has the cooling structure, the fan 8 is turned on when the power is turned on by use.
By setting the light source 1 in the operating state, the light source 1 in the first air flow passage 30 in the optical system module case 32 is
1, the cold mirror 15, the cold filter 16, and the liquid crystal display module 21 can be effectively cooled, respectively, and the power supply 5 for the light source 11 is effective in the second air flow passage 40 outside the optical system module case 32. Can be cooled. That is, as shown in FIG. 4, the outside air passes through the intake louver 6 a from the intake port 6 by suction of the fan 8, is cleaned by removing dust by the intake filter 7, and then flows into the device case 2 via the fan 8. The first air flow passage 30 and the second air flow passage 40 are branched and flow.

Then, in the first air flow passage 30,
The cooling air flows toward the liquid crystal display module 21 and the cold filter 16 to cool them, and at the same time, flows to the cold mirror 15, the lamp 12 of the light source 11 and the lamp house 14 in order to cool them. Further, the cooling air that has flowed through the liquid crystal display module 21 and the cold filter 16 flows through the air guide 39 to the lamp house 14 and the power source 5 in this order, and after cooling them in order, it passes through the exhaust louver 9a and the exhaust port. 9 is discharged to the outside air. Similarly, the cooling air flowing through the cold mirror 15, the lamp 12 of the light source 11, and the lamp house 14 is also discharged to the outside air from the discharge port 9 through the exhaust louver 9a. In addition, in the second air flow passage 40, the cooling air flows through the light source 1
After flowing along the power source 5 for 1 and cooling, it is discharged to the outside air from the discharge port 9 through the exhaust louver 9a.

Next, a specific flow of cooling air will be described. First, as shown in FIG.
The air sucked into the device case 2 by the cooling air flows into the optical system module case 32 and flows through the first air flow passage 30, and the optical system module case 3
2 and the cooling air flowing out through the second air flow passage 40. As shown in FIG. 5, the second air flow passage 40 is connected to the fan duct 8a and connected to the baffle plate 31.
Cooling air flows out of the optical system module case 32 from the openings 34, 34 on both sides of the wall 33 continuous with the optical system module case 32.

As for the cooling air flowing through the first air flow passage 30 in the optical system module case 32, as shown in FIG. 3, the cooling air flowing toward the liquid crystal display module 21 and the cold mirror. It is divided into cooling air flowing toward 15. The cooling air flowing toward the liquid crystal display module 21 flows along the liquid crystal display panel 22, the incident side polarizing plate 23, the emitting side polarizing plate 24, and the cold filter 16, respectively, and after cooling them, as shown in FIG. The wall 3 facing the outlet 9
Hit 5 The cooling wind hitting the wall 35 goes out of the optical system module case 32 through the opening 36 on one side thereof and is discharged from the discharge port 9 as it is (see wind), and on the side opposite to the opening 36, the cooling air flows. It goes out of the optical system module case 32 through an opening 37 on the upper surface in the drawing (see cooling air).

Further, the cooling air flowing toward the cold mirror 15 flows along the cold mirror 15 to cool it, and then flows toward the light source 11 to cool it. Here, for the light source 11, the reflector 13
A cooling air flows around the lamp to cool the reflector 13 and the inside of the lamp 12 therein, and at the same time, the reflector 13
Cooling air flows into the lamp house 14 through the gap of the playing house 14 and is discharged to the outside from the louver provided in the reflector 13 to cool the lamp house 14 from the inside. The cooling air that has cooled these flows out of the optical system module case 32 through the opening 38 at the upper part of the drawing that is continuous with the lamp house 14 (see the cooling air in FIG. 6).

The cooling air that has flowed out of the optical system module case 32 through the openings 37 and 38 is
As shown in FIG. 7, the walls 41, 42, 43 flow through the air guide path 39 so as to circulate around the lamp house 14 (see cooling air), and after cooling the lamp house 14 from the outside,
It joins the second air flow passage 40. On the other hand, the cooling air flowing through the second air flow passage 40 outside the optical system module case 32 flows along the power supply 5 for the light source 11, cools the power supply 5, and then flows through the air guide passage 39. It joins with the cooling air and is discharged from the discharge port 9 (see wind).

As described above, the single fan 8 is used to cool the optical system module 10 in the first air flow passage 30, and the light source 11 is used in the second air flow passage 40. Since the power source 5 is cooled, the cooling air is enclosed in the liquid crystal display panel 22,
Optical system components (incident side polarization plate 23, emission side polarization plate 24, cold mirror 15, cold filter 16), light source 1
One side and the power source 5 side for the light source 11 are divided and each can be efficiently cooled. In addition, an air guide path 39 that branches from the vicinity of the discharge port 9 side of the first air flow passage 30 and joins with the second air flow passage 40 is provided, and a part of the cooling air is supplied to the lamp house 14 of the light source 11. Since the air is guided to the surroundings, the cooling air can be further flowed to the outside of the lamp house 14 with respect to the light source 11 having the highest temperature, so that the cooling can be performed more efficiently.

In the above embodiments, the single-panel type liquid crystal projection television is used, but the present invention is not limited to this. It may be a three-panel liquid crystal projector including the above. In addition, it is needless to say that the detailed structure such as the structure of the air flow passage including the intake port and the exhaust port, the location of the fan, and the like can be appropriately changed.

[0027]

As described above, according to the liquid crystal projector of the first aspect of the invention, in the equipment case,
Cooling air generated by one fan, a first air flow passage from the suction port to the discharge port through the optical system module,
Since it is divided into the second air flow passage from the suction port to the discharge port through the power source for the light source, the liquid crystal display element, the optical system component, the light source side and the power source side for the light source are efficiently separated. Can be cooled.

According to the liquid crystal projector of the second aspect of the invention, the second air branch is branched from the vicinity of the outlet side of the first air flow passage and a part of the cooling air is guided to the periphery of the light source. Since the air guide passage that joins the air flow passage is formed, the light source with the highest temperature can be cooled more efficiently.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a liquid crystal projection television as an example of a liquid crystal projector to which the present invention is applied.

FIG. 2 is a rear view of an internal cutaway showing an internal cooling structure of the liquid crystal projection television of FIG.

FIG. 3 is an enlarged rear view of the main part showing the flow of cooling air according to the present invention.

FIG. 4 is a block diagram showing a detailed flow of cooling air according to the embodiment.

FIG. 5 is a schematic perspective view showing a portion for taking out cooling air from a fan to a second air flow passage.

FIG. 6 is a schematic perspective view showing the flow of cooling air around the optical system module.

FIG. 7 is a schematic perspective view showing a confluence of cooling air around the optical system module and cooling air on the power supply side.

[Explanation of symbols]

 1 Liquid Crystal Projector 2 Equipment Case 3 Screen 4 Pedestal 5 Power Supply 6 Inlet 7 Intake Filter 8 Fan 8a Fan Duct 9 Outlet 10 Optical System Module 11 Light Source 12 Lamp 13 Reflector 14 Lamp House 15 Cold Mirror 16 Cold Filter 21 Liquid Crystal Display Module 22 Liquid crystal display panel 25 Projection lens 30 First air flow passage 31 Air guide plate 32 Optical system module case 33 Wall 34 Opening 35 Wall 36, 37, 38 Opening 39 Air guide passage 40 Second air flow passage 41, 42, 43 wall

Claims (2)

[Claims] 1. A liquid crystal display module including a liquid crystal display panel for displaying an image, a light source for emitting light, a mirror for reflecting or transmitting the light emitted by the light source to irradiate the liquid crystal display panel, and a liquid crystal display panel for displaying the light. A liquid crystal projector in which an optical system module including a projection lens for projecting image light on a screen and a power supply for supplying electric power to the light source are housed in a device case, wherein an inlet and an outlet for cooling air are provided in the device case. A fan for generating the cooling air in the device case, a first air flow passage from the suction port to the discharge port through the optical system module, and from the suction port. A liquid crystal projector, wherein a second air flow passage is formed through the power source and reaches the discharge port. 2. An air guide path that branches from the vicinity of the outlet side of the first air flow path and guides a part of the cooling air to the periphery of the light source and then joins the second air flow path. The liquid crystal projector according to claim 1, wherein the liquid crystal projector is formed.