JPH09133911A - Liquid crystal display - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a structure for keeping the temperature of liquid crystal at an appropriate temperature in order to display a high quality image. By controlling the flow of cold air or warm air as desired, temperature control with less structural restrictions can be achieved. A liquid crystal display device capable of being obtained. SOLUTION: The temperature of the liquid crystal is controlled by placing a fan at a position away from the liquid crystal panel and guiding cold air or warm air taken in by the fan to a position where the liquid crystal is installed by a duct provided between the fan and the liquid crystal. To do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control structure inside a device, mainly to a liquid crystal display device capable of controlling the temperature of a liquid crystal panel.

[0002]

2. Description of the Related Art As a display device for enlarging and projecting an image on a television or a computer, a projector has been widely spread for both consumer and business use. In particular, a liquid crystal display device using a liquid crystal panel as an image modulator has been rapidly growing in demand in recent years as a small and lightweight device capable of achieving high brightness, and has shown a momentum to replace the device equipped with a CRT until then. There is.

FIG. 30 is a sectional view showing an optical unit portion of a conventional liquid crystal display device disclosed in, for example, Japanese Utility Model Laid-Open No. 3-43629. In the figure, reference numeral 1 is a light source that emits white light, and 2 is a reflector that reflects light forward, forming a lamp 3. A liquid crystal panel 4 displays a color image, the light condensed by the condenser lens 5 is optically modulated, and then enlarged and projected by the projection lens 6. These optical components are arranged at predetermined positions to form the optical unit 7. 8 is a unit case that forms the outer contour of the optical unit 7,
A blower fan 11 for cooling the liquid crystal panel 4 is attached near the liquid crystal panel 4 installation portion.

Reference numeral 9 denotes an optical unit 7 for blowing the wind of the blower fan 11.
Reference numeral 10 denotes an air intake port for entering the inside of the optical unit 7, and 10 is an air extraction port through which the air is blown to the outside of the optical unit 7.
Reference numeral 13 denotes a liquid crystal display cabinet, which is provided with an intake hole 14 for taking in air to the blower fan 11 and an exhaust hole 15a for exhausting air.

Next, the operation will be described. The light emitted from the light source 1 directly or reflected and emitted by the reflector 2 is condensed by the condenser lens 5 and applied to the liquid crystal panel 4. now,
An image is displayed on the liquid crystal panel 4 by image information converted from an external signal (not shown), and when the irradiation light is transmitted, light modulation is performed to irradiate the projection lens 6 with a color image. The image that has entered the projection lens 6 is magnified and projected on the screen 16, and the image is provided for viewing.

At this time, since the color image projected on the screen 16 is much larger than the liquid crystal panel 4,
In order to obtain sufficient brightness, the liquid crystal panel 4 must be irradiated with strong light. However, the liquid crystal panel 4 has a strong temperature dependency, and when the temperature is high, the viscosity of the liquid crystal decreases and the response to the applied voltage is modulated, so that a regular color image can be displayed. Therefore, the blower fan 11 takes in the outside air from the intake hole 14 of the cabinet 13 and blows it from the air intake 9 of the unit case 8 onto the liquid crystal panel 4 to suppress the temperature rise of the liquid crystal.

The outside air blown into the optical unit 7 is
After the liquid crystal panel 4 is cooled, it is exhausted to the outside of the optical unit 7 through the air outlet 10 and further to the outside of the cabinet 15 through the exhaust hole 15a so that fresh outside air can always be sucked.

As another conventional example, Japanese Patent Application Laid-Open No. 4-271
There is a Japanese Patent No. 334 publication, and its configuration is shown in FIG. In this conventional example, white light from a lamp is separated into three primary colors of red, green, and blue, and light is modulated by three liquid crystal panels corresponding to the respective colors.
This is a method of enlarging and projecting a color image obtained by combining again on a screen by a projection lens. In the figure, 2
Reference numeral 0 denotes a lamp house in which a lamp 3 having a light source 1 and a reflector 2 is housed, and a liquid crystal panel 4r corresponding to red, a liquid crystal panel 4g corresponding to green, and a liquid crystal panel corresponding to blue are provided in the optical path of irradiating the projection lens 6. 4b, and dichroic mirrors 18a, 18b, 18 that reflect a particular color
c, 18d and total reflection mirrors 17a, 17b, 17c are arranged.

Reference numeral 13 denotes a cabinet which is an outer case of the liquid crystal display device, and is provided with an intake hole 14 and an exhaust hole 15a. An exhaust fan 12a for discharging the air inside the device to the outside is installed in the exhaust hole 15a. ing. Further, a blower fan 11 for taking in outside air is installed near the liquid crystal panel 4r, 4g, 4b installation portion.

The inside of the cabinet 13 is separated into a light source chamber 21 and a liquid crystal display panel chamber 22 by a transparent partition plate 19.
A duct 23 is provided for guiding the air blown from the liquid crystal display panel chamber 22 by the blower fan 11 to the light source chamber 21. The air guided by the duct 23 passes through the power source 24 and the lamp house 20 and is exhausted to the outside by the exhaust fan 12a.

Next, the operation will be described. The white light emitted from the light source 1 is reflected by the total reflection mirror 17a and applied to the first color separation dichroic mirror 18a. Of the white light, only the blue light is reflected and the total reflection mirror 1
After passing through 7b, the liquid crystal panel 4b corresponding to blue is irradiated with the light and modulated there. The red light and the green light transmitted through the dichroic mirror 18a proceed to the second color separation dichroic mirror 18b, where the green light is reflected and optically modulated by the liquid crystal panel 4g corresponding to green. After passing through the dichroic mirror 18b, the red light goes straight to the liquid crystal panel 4r corresponding to red and is modulated. In this way, the image information optically modulated corresponding to the three primary colors is the dichroic mirrors 18c and 18d for color combination and the total reflection mirror 17c.
It is enlarged and projected on the screen 16 through the projection lens b as a color image combined by.

At this time, each of the liquid crystal panels 4r, 4g, 4b
On the other hand, since the color image projected on the screen 16 is much larger, it is necessary to irradiate each liquid crystal panel 4r, 4g, 4b with strong light in order to obtain sufficient brightness. However, each of the liquid crystal panels 4r, 4g, and 4b has a strong temperature dependency, and when the temperature is high, the viscosity of the liquid crystal decreases and the response to the applied voltage is modulated, so that a normal image can be displayed. Therefore, the blower fan 11 introduces the outside air into the liquid crystal display panel chamber 22 from the intake hole 14 of the cabinet 13 to cool the liquid crystal panels 4r, 4g, and 4b of each color to suppress the temperature rise. Further, the outside air entering the liquid crystal display panel chamber 22 is sent to the light source chamber 21 by the blower fan 11 and guided by the duct 23 so as to pass near the power source 24 and the lamp house 20 to be cooled.
Then, the warmed air is discharged to the outside by the exhaust fan 12a.

Further, as another conventional example, JP-A-1-31
There is also one disclosed in Japanese Patent No. 4288. In some cases, a polarizing plate attached near the liquid crystal panel is liquid-cooled with a cooling liquid and a heat radiating plate to prevent the liquid crystal panel from being heated.

[0014]

In the conventional liquid crystal display device as described above, since a blower fan is attached in the vicinity of the liquid crystal panel installation portion to blow the air on the liquid crystal panel, a bumping sound is generated and noise is large.

Further, the position of the intake hole is limited due to the positional relationship of attachment of the blower fan, and there is no freedom in design design.

When three liquid crystal panels are installed,
The amount of air that hits each panel cannot be controlled, and a difference occurs in cooling between the liquid crystal panels, which disturbs the image.

Further, it is impossible to deal with the supercooling of the liquid crystal panel, which causes the hue of the projected image to be modulated.

Further, since the wind flows in a place having a small air flow resistance, in the structure in which the liquid crystal display panel chamber and the light source chamber are separated, the wind avoids the liquid crystal panel in the liquid crystal panel chamber and the liquid crystal is cooled. Hateful. In order to solve this, it is necessary to form an air passage in the vicinity of the liquid crystal panel so that the wind can flow positively, but it is extremely difficult to construct the air passage without obstructing the optical path.

Further, in order to cool the liquid, a cooling liquid and a heat radiating plate are required, which is costly, disadvantageous in terms of space, and risk of liquid leakage.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid crystal display device capable of keeping a liquid crystal panel at a predetermined temperature and obtaining a high quality image.

[0021]

In the liquid crystal display device according to the present invention, the air for cooling the liquid crystal panel is sent through a duct from a blower fan installed at a place far away from the liquid crystal panel installation portion. is there.

In addition, a duct is connected from the liquid crystal panel installation portion to the blower fan, and a deflection wall is provided in the duct to distribute and flow the air flow.

Further, a duct connects the liquid crystal panel installation portion to the blower fan, and the duct is provided with an opening other than the liquid crystal panel installation portion.

Further, a duct connects the liquid crystal panel installation portion to the blower fan, and the duct is provided with an opening other than the liquid crystal panel installation portion and an openable / closable door.

Further, a duct is connected from the liquid crystal panel installation portion to the blower fan, an opening other than the liquid crystal panel installation portion is provided in the duct, and a heating element such as a heater is installed in the duct.

Further, a duct is connected from the liquid crystal panel installation portion to the blower fan, an opening other than the liquid crystal panel installation portion is provided in the duct, and a heating element such as a heater is installed in the duct and the liquid crystal panel or the vicinity thereof. The temperature sensing element is installed in the.

The hot air from the light source section is sent to the liquid crystal panel installation section through the duct.

Further, in order to guide the warm air of the light source section to the liquid crystal panel, a duct is provided from the vicinity of the exhaust port of the light source cooling fan to the liquid crystal panel installation section, and a door for opening and closing is attached to the duct.

In addition, the duct from the liquid crystal panel installation section to the blower fan is connected by a duct provided with an opening in addition to the liquid crystal panel installation section, and another duct is also connected from the liquid crystal panel installation section to the light source section. , Opening and closing doors are installed in both ducts.

In addition, the duct from the liquid crystal panel installation section to the blower fan is connected by a duct provided with an opening other than the liquid crystal panel installation section, and another duct is also connected from the liquid crystal panel installation section to the light source section. Opening and closing doors are installed on both ducts, and these doors can be opened and closed in conjunction with each other.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION In the liquid crystal display device according to the embodiment of the present invention, since the air for cooling the liquid crystal panel is guided through the duct, the installation position of the blower fan can be freely selected and a plurality of sheets can be installed. The amount of air applied to the liquid crystal panel can be controlled, and the liquid crystal panel can be cooled evenly.

Further, since the wind for cooling the liquid crystal panel is guided through the duct and the deflecting wall is provided in the duct, the wind from the blower fan has a predetermined direction and air volume by the deflecting wall while passing through the duct. Since it is distributed, the installation position of the blower fan can be freely selected, and the amount of air blown onto the plurality of liquid crystal panels can be controlled to uniformly cool the liquid crystal panels.

Further, since the air for cooling the liquid crystal panel is guided through the duct, the position of the blower fan can be freely selected, and the amount of air applied to the plurality of liquid crystal panels can be controlled to uniformly cool the liquid crystal panels. Moreover, since the air from the blower fan is directed to the liquid crystal panel by providing an opening separately from the liquid crystal panel, the other parts can be cooled at the same time.

Further, since the air for cooling the liquid crystal panel is guided through the duct, the installation position of the blower fan can be freely selected, and the amount of air applied to the plurality of liquid crystal panels can be controlled to uniformly cool the liquid crystal panels. By providing an opening in the duct that is different from the one in which the wind is directed to the liquid crystal panel, and by installing a door that can be opened and closed in the opening, other parts can be cooled at the same time by the wind of the blower fan. It is possible to adjust the amount of airflow flowing in each direction.

Further, since the air for cooling the liquid crystal panel is guided through the duct, the installation position of the blower fan can be freely selected, the amount of air applied to the plurality of liquid crystal panels can be controlled, and the liquid crystal panels can be evenly cooled. In addition, when the device is started up, the heater installed in the duct is operated for a set time, so that the air from the blower fan can be converted into warm air for a predetermined time, and the liquid crystal panel can be raised to an appropriate temperature in a short time. Can be made.

Further, since the air for cooling the liquid crystal panel is guided through the duct, the installation position of the blower fan can be freely selected, the amount of air applied to the plurality of liquid crystal panels can be controlled, and the liquid crystal panels can be evenly cooled. In addition, by detecting the temperature of the liquid crystal panel part with a temperature sensing element and turning on and off the heater installed in the duct, the air of the blower fan can be converted into cold air and hot air at any time, and the temperature of the liquid crystal panel can be changed. It can be kept at a suitable temperature.

Further, since the warm air of the light source section is guided to the liquid crystal panel installation section through the duct, it is possible to positively warm the liquid crystal panel when the temperature of the liquid crystal panel is low when the apparatus is started up.

Further, the warm air of the light source section is guided to the liquid crystal panel installation section through the duct, and the door installed in the duct is opened and closed, whereby the liquid crystal panel can be warmed positively only when the temperature is low. .

Further, since the air for cooling the liquid crystal panel is guided through the duct, the installation position of the blower fan can be freely selected, and the amount of air applied to the plurality of liquid crystal panels can be controlled to uniformly cool the liquid crystal panels. be able to. Further, an opening and a door that can be opened and closed are provided in the duct through which the air blown by the blower fan flows, and the hot air of the light source unit is also guided to the liquid crystal panel installation portion by the duct and the door that can be opened and closed. By independently opening and closing, it is possible to apply both cold air and warm air to the liquid crystal panel, and at the same time cool other parts by the air of the blower fan.

Further, since the air for cooling the liquid crystal panel is guided through the duct, the installation position of the blower fan can be freely selected, and the amount of air applied to the plurality of liquid crystal panels can be controlled to uniformly cool the liquid crystal panels. be able to. Further, an opening and a door that can be opened and closed are provided in the duct through which the air blown by the blower fan flows, and the hot air of the light source unit is also guided to the liquid crystal panel installation portion by the duct and the door that can be opened and closed. It is possible to switch between applying cold air and hot air to the liquid crystal panel in a single operation by opening and closing in conjunction with. Also, other parts can be cooled at the same time by the wind of the blower fan.

The present invention will be specifically described below with reference to the drawings showing the embodiments thereof. Embodiment 1 FIG. 1 is a front view seen through a liquid crystal display device according to a first embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG.
4 is a front view of the optical unit of the liquid crystal display device according to the first embodiment of the present invention seen through, and FIG. 4 is a perspective view of the optical unit of the liquid crystal display device according to the first embodiment of the present invention. In the figure, the same or corresponding parts as those of the conventional liquid crystal display device are designated by the same reference numerals and the description thereof will be omitted. First, the configuration of the optical unit of the liquid crystal display device will be described with reference to FIG. In the first embodiment, the white light from the lamp 3 is changed to red,
Dichroic mirrors 18a and 18b and total reflection mirrors 17a and 17b for separating the three primary colors of green and blue are installed at predetermined positions. Further, dichroic mirrors 18c and 18d for recombining the images optically modulated by the three liquid crystal panels 4r, 4g, and 4b corresponding to each color, and a total reflection mirror 17c are installed, and the combined color image is displayed. This is a method of enlarging and projecting on the screen 16 by the projection lens 6. Reference numeral 25 denotes a mirror support member that holds the total reflection mirror 17 and the dichroic mirror 18, and 26
Is a liquid crystal panel support member that holds the liquid crystal panel 4.
Reference numeral 27 denotes a light shielding wall provided so that the light of the lamp 3 does not leak to the optical unit 7, and 8 denotes a unit case in which the optical unit 7 is housed. The optical unit 7 is configured as described above, and the light emitted from the lamp 3 is reflected by the total reflection mirror 1.
7, through dichroic mirror 18, liquid crystal panel 4,
A representative line of light to reach the screen 16 is shown as an optical path at 28.

On the other hand, the configuration other than the optical unit 7 is shown in FIG.
This will be described with reference to FIGS. 2 and 4. An exhaust fan 12a is installed in the vicinity of the lamp 3, for example, in the upper part as shown in FIGS. 1 and 2, and forcibly exhausts warm air around the lamp 3. Further, the unit case 8 has air intake ports 9r, 9g corresponding to the places where the liquid crystal panels 4r, 4g, 4b are installed.
Air outlets 10r, 10g, 10b on the side opposite to 9b
Is provided, and the duct A23a is attached so as to cover the air intake ports 9r, 9g, 9b. A blower fan 11 is installed at one end of the duct A23a so that outside air can flow into the optical unit 7 through the duct A23a from the air intake ports 9r, 9g, 9b. Reference numeral 13 is a cabinet that houses the optical unit 7 and the like, and is provided with an intake hole 14 and an exhaust hole 15a. Further, electric circuit boards 29a, 2a for driving the liquid crystal panel 4 and the lamp 3 so that the optical unit 7 is sandwiched therebetween.
9b is installed.

Next, the operation will be described. The white light emitted from the lamp 3 is reflected by the total reflection mirror 17a and is emitted to the first color separation dichroic mirror 18a. Of the white light, only the blue light is reflected and reflected by the total reflection mirror 17b, and then is radiated to the blue-compatible liquid crystal panel 4b, where it is optically modulated. The red light and the green light transmitted through the dichroic mirror 18a proceed to the second color separation dichroic mirror 18b, where the green light is reflected and optically modulated by the liquid crystal panel 4g corresponding to green. After the red light passes through the dichroic mirror 18b, it goes straight to the liquid crystal panel 4r corresponding to the red color, is modulated by the light, is reflected by the total reflection mirror 17c, and is reflected by the dichroic mirror 18c.
to d. In this way, the image information optically modulated corresponding to the three primary colors is the dichroic mirrors 18c, 1c for color combination.
8d, and the projection lens 6 is combined as a color image.
The image is enlarged and projected on the screen 16 through.

At this time, since the color image projected on the screen 16 is much larger than the liquid crystal panel 4,
In order for the projected image to have sufficient brightness on the screen 16, the liquid crystal panel 4 must be irradiated with strong light.
However, the liquid crystal panel 4 has a strong temperature dependency, and when the temperature rises, the viscosity of the liquid crystal decreases and the response to the applied voltage becomes abnormal, and a normal image cannot be displayed. Therefore, outside air is introduced by the blower fan 11 and the introduced cool air is blown into the air intake ports 9r, 9g, 9b provided in the unit case 8 by the duct A23a. The cool air that has entered the optical unit 7 through the air intake ports 9r, 9g, and 9b passes near the liquid crystal panels 4r, 4g, and 4b, and is discharged to the outside of the optical unit 7 through the air extraction ports 10r, 10g, and 10b. At this time, the cold air enters the optical unit 7 to replace the warm air in the vicinity of the liquid crystal panels 4r, 4g, and 4b and remove heat from the liquid crystal panels 4r, 4g, and 4b. Therefore, the liquid crystal panels 4r, 4g, and 4b should be cooled. You can Then, the exhaust fan 12a exhausts the air that has cooled the lamp 3 and the air that has flown around the outside of the optical unit 7 after cooling the liquid crystal panel 4 to the outside of the cabinet 13 through the exhaust hole 15a.

Embodiment 2 FIG. 5 is a front view of the liquid crystal display device according to the second embodiment of the present invention seen through. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In addition, the basic configuration of the optical unit 7 and white light from the lamp 3 are separated into three primary colors of red, green and blue, and the light is modulated by the liquid crystal panel 4 corresponding to each color, and then combined again to create a color image. Since the method is the same as that of the first embodiment, the description is omitted.

2, FIG. 3, and FIG. 5, liquid crystal panels 4r, 4g, and 4b are disposed at predetermined positions in the optical unit 7 installed in the cabinet 13 while being held by the liquid crystal panel support member 26. There is. This liquid crystal panel 4
Air intake ports 9r, 9g corresponding to r, 4g, 4b,
9b and air outlets 10r, 10g, 10b are provided in the unit case 8 of the optical unit 7, and a duct A23a is attached so as to cover the air inlets 9r, 9g, 9b. The duct A 23a is provided with deflection walls 30a and 30b.
The air from the blower fan 11 attached to one end of 23a is distributed.

Next, the operation will be described. White light into red,
A method that separates the light into green and blue, modulates it, and then synthesizes it again to create a color image.
The method of cooling by applying cold air through the duct A23a is the same as in the first embodiment. The difference is that the duct A23a is provided with the deflection walls 30a and 30b.
The outside air taken in by the air is sent into the duct A23a as cold air, and is properly distributed by the deflecting walls 30a and 30b as shown by the arrows in the figure, and a large amount of air flows in the liquid crystal panel 4b near the heat source such as the lamp 3. The three liquid crystal panels 4r, 4g, and 4b are made to flow so that a small amount of air flows to the liquid crystal panel 4r far from the heat source.
The temperature rise is controlled to be uniform. The air that has passed through the liquid crystal panels 4r, 4g, and 4b goes from the air outlets 10r, 10g, and 10b of the unit case 8 to the outside of the optical unit 7, and together with the air that has cooled the lamp 3, the exhaust fan 12a of the cabinet 13 is used. It is discharged to the outside through the exhaust hole 15a.

Embodiment 3 6 is a front view of a liquid crystal display device according to a third embodiment of the present invention seen through, FIG. 7 is a side view of FIG. 6, and FIG. 8 is a perspective view of an optical unit of the liquid crystal display device according to the third embodiment of the present invention. It is a figure. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In addition, the basic configuration of the optical unit 7 and white light from the lamp 3 are separated into three primary colors of red, green and blue, and the light is modulated by the liquid crystal panel 4 corresponding to each color, and then combined again to create a color image. Since the method is the same as that of the first embodiment, its explanation is omitted.

6, 7, and 8, the liquid crystal panels 4r, 4g, and 4b are arranged at predetermined positions in the optical unit 7 installed in the cabinet 13 while being held by the liquid crystal panel support member 26. . This liquid crystal panel 4r, 4
Air inlets 9r, 9g, 9b and air outlets 10r, 10g, 10b corresponding to g and 4b are provided in the unit case 8 of the optical unit 7, and cover the air inlets 9r, 9g, 9b. Like duct A23
a is attached. Further, electric circuit boards 29a and 29b for driving the liquid crystal panel 4 and the lamp 3 are provided so as to sandwich the optical unit 7. A blower fan 11 is provided at one end of the duct A23a,
The outside air is made to flow into the optical unit 7 from the air intake ports 9r, 9g, 9b as cold air through the intake duct A23a. Further, the duct A2
3a, the blower fan 11 and the air intakes 9r, 9
An opening 31 for discharging outside the duct is provided between g and 9b, and a part of the cool air flowing through the duct A23a is sent to the electric circuit board 29a through the opening 31 for discharging outside the duct. ing.

Next, the operation will be described. White light into red,
A method that separates the light into green and blue, modulates it, and then synthesizes it again to create a color image.
The method of cooling by applying cold air through the duct A23a is the same as in the first embodiment. A different point is that the duct 23a is provided with an opening 31 for discharging outside the duct, whereby a part of the wind flowing in the duct A 23a hits the electric circuit board 29a from the opening 31 for discharging outside the duct. The electric circuit board 29a has a part having a high temperature, such as a high-power transistor IC, but can be cooled by the air from the duct outside discharge opening 31. In addition,
The air that has cooled the electric circuit board 29a is exhausted by the exhaust fan 12a.
With the air that has cooled the liquid crystal panel 4 and the air that has been warmed by the lamp, the air is discharged to the outside of the cabinet 13 through the exhaust hole 15a.

Embodiment 4 FIG. 9 is a front view of a liquid crystal display device according to a fourth embodiment of the present invention seen through, and FIG.
11 is a side view and FIG. 11 is a perspective view of an optical unit of a liquid crystal display device according to a fourth embodiment of the present invention. FIG. 12 is a conceptual diagram of a drive mechanism for an opening / closing door of a liquid crystal display device according to a fourth embodiment of the present invention. In the figure, the same parts as those in the third embodiment are designated by the same reference numerals and the description thereof will be omitted. In addition, the basic configuration of the optical unit 7 and the white light from the lamp 3 are converted into red, green,
The method of separating the three primary colors of blue and subjecting them to light modulation by the liquid crystal panel corresponding to each color, and then combining them again to create a color image is the same as in the third embodiment, and therefore a description thereof is omitted.

In FIG. 9, FIG. 10, FIG. 11 and FIG.
The liquid crystal panels 4r, 4g, and 4b are arranged at predetermined positions in the optical unit 7 installed in the cabinet 13 while being held by the liquid crystal panel support member 26. Air intake ports 9r, 9 corresponding to the liquid crystal panels 4r, 4g, 4b
g, 9b and air outlets 10r, 10g, 10b are provided in the unit case 8 of the optical unit 7,
A duct A23a is attached so as to cover the air intake ports 9r, 9g, 9b. Further, electric circuit boards 29a and 29b for driving the liquid crystal panel 4 and the lamp 3 are provided so as to sandwich the optical unit 7.
A blower fan 11 is provided at one end of the duct A23a, and external air is introduced into the optical unit 7 through the duct A23a as cold air from the air intake ports 9r, 9g, 9b. Furthermore, the duct A23a has a blower fan 11 and an air intake port 9r,
An opening 31 for discharging outside the duct is provided between 9g and 9b, and a part of the wind flowing through the duct A23a is sent to the electric circuit board 29a through the opening 31 for discharging outside the duct. There is. A flap A32a for controlling the flow of wind is provided at the outside-exhaust opening 31 of the duct, and is rotatably supported about a rotation shaft 33a which is axially passed through the duct A23a and is planted on the flap A32a. The pin A42a is moved to open and close. Reference numeral 38a is a plunger A for driving the flap A32a, which is movable in the x1-x2 directions by an electric operation. The shaft of the plunger A38a has a joint A
35a is coupled, and the joint A35a moves in the x1-x2 direction in conjunction with the plunger A38a. At this time, the groove B43b formed at the end of the joint A35a and the duct A
The pin A42a is engaged with the groove A43a formed in the groove 23a, and the flap A32a rotates in the θ1-θ2 direction according to the movement of the plunger A38a in the x1-x2 direction.

Next, the operation will be described. White light into red,
A method that separates the light into green and blue, modulates it, and then synthesizes it again to create a color image.
The method of cooling by applying cold air through the duct A23a is the same as in the third embodiment. The difference is that the flap A32a is provided, and the flap A32a is different from the duct A23.
The temperature of the liquid crystal panel 4 can be controlled by controlling the direction of the cool air flowing through a. Immediately after the power is turned on to the device, the temperature of the liquid crystal panel 4 does not reach the proper temperature of the liquid crystal, so that it does not have proper normal functions. Therefore, immediately after the power is turned on, cooling by applying wind rather deteriorates the image quality. Therefore, an electric signal is sent so that the shaft of the plunger A38a contracts in the x1 direction for a predetermined time after the power is turned on. When the shaft of the plunger A38a contracts in the x1 direction, the flap A32a rotates about the rotation shaft 33a by θ1.
Rotate in the direction. As a result, a wall is formed in the duct A23a by the flap A32a, and the air blown from the blower fan 11 is discharged from the duct outside discharge opening 31 to the duct A23a.
It is discharged to the outside and cools the electric circuit board 29a. At this time, the cold air does not flow into the optical unit 7, so that the liquid crystal panels 4r, 4g, 4b are not cooled, and the temperature of the liquid crystal panels 4r, 4g, 4b can be quickly raised to an appropriate temperature. In addition, since the temperature of the liquid crystal panels 4r, 4g, 4b has reached an appropriate temperature after a lapse of a predetermined time after the power is turned on, it is necessary to cool the liquid crystal panels 4r, 4g, 4b. Plunger A3
An electric signal is given to extend 8a in the x2 direction. Then, the flap A32a is opposite to the flap A32a in the opposite direction.
It rotates in the direction of θ2. As a result, cold air is blown into the liquid crystal panels 4r, 4g, 4b, and the liquid crystal can be cooled. Further, since a part of the cool air is discharged to the electric circuit board 29a from the duct outside exhaust opening 31, the electric circuit board 29a can be cooled at the same time. As described above, the flap A3 for controlling the flow of cold air in the duct A23a
By providing 2a, the liquid crystal panels 4r, 4g, 4
b can be optionally cooled, and the temperature of the liquid crystal panels 4r, 4g, 4b can be controlled. The liquid crystal panels 4r, 4g,
There is also a means for stopping the blower fan 11 as a method of not exposing the outside air to 4b, but since the electric circuit board 29a cannot be cooled, the structure of this embodiment is required.

Embodiment 5 FIG. 13 is a front view of a liquid crystal display device according to a fifth embodiment of the present invention seen through, and FIG.
4 is a side view of FIG. In the figure, the third embodiment
The same parts as those in FIG. In addition, the basic structure of the optical unit, a method of separating white light from a lamp into three primary colors of red, green, and blue, performing light modulation with a liquid crystal panel corresponding to each color, and then synthesizing again to create a color image and duct. The basic flow of air by
Therefore, the description is omitted.

13 and 14, the cabinet 1
The liquid crystal panels 4r, 4g, and 4b are arranged at predetermined positions in the optical unit 7 installed inside the liquid crystal panel supporting member 26. This liquid crystal panel 4r, 4g,
4b corresponding to the air intake 9r, 9g, 9b and the air outlet 10r, 10g, 10b is the optical unit 7.
The unit case 8 is provided with a duct A23a so as to cover the air intake ports 9r, 9g, 9b. Further, electric circuit boards 29a and 29b for driving the liquid crystal panel 4 and the lamp 3 are provided so as to sandwich the optical unit 7. The duct A2
A blower fan 11 is provided at one end of 3a, and external air is introduced into the optical unit 7 from the air intake ports 9r, 9g, 9b as cool air through the intake duct A23a. Between the blower fan 11 and the air intake ports 9r, 9g, 9b, an opening 3 for discharging outside the duct is provided.
1 is provided so that a part of the cold air flowing through the duct A23a is sent to the electric circuit board 29a through the duct outside discharge opening 31. Although there are some parts of the electric circuit board 29a that become hot, such as a high-power transistor IC, for example, they can be cooled by cold air from the duct outside discharge opening 31. The air that has cooled the electric circuit board 29a is discharged to the outside of the cabinet 13 through the exhaust holes 15a together with the air that is discharged from the exhaust fan 12a. Reference numeral 39 denotes a heater, which is located on the lee side of the opening 31 for discharging outside the duct, and is configured so that the wind toward the liquid crystal panel 4 passes near the heater 39. Therefore, when the heater 39 is operated, the wind becomes warm air by the heater 39 and passes through the air intake ports 9r, 9g, 9b, and the liquid crystal panel 4r,
It becomes possible to raise the temperature of the liquid crystal panels 4r, 4g, 4b upon hitting 4g, 4b. Further, when the heater 39 is stopped, cold air flows through the liquid crystal panels 4r, 4g, 4b as it is, and the liquid crystal panels 4r, 4g, 4b can be cooled. The air that has passed through the liquid crystal panels 4r, 4g, and 4b is discharged to the outside of the optical unit 7 through the air outlets 10r, 10g, and 10b, and together with the air that has cooled the electric circuit board 29a by the exhaust fan 12a and the air that has been warmed by the lamp 3. It is discharged to the outside of the cabinet 13.

Next, the operation will be described. White light into red,
The method for producing a color image by separating the light into green and blue, performing light modulation, and then synthesizing again is the same as in the third embodiment. The difference is that the heater 39 is provided at the leeward position of the duct outside discharge opening 31 of the duct A23a for sending the outside air taken in by the blower fan 11 as cold air. Since the temperature of the liquid crystal panel 4 is equal to or lower than the proper temperature when the liquid crystal panel 4 is raised, the temperature of the liquid crystal panel 4 is raised by energizing the heater 39 for a certain period of time with a timer or the like (not shown) and blowing hot air into the liquid crystal panel 4. Then, the temperature can be quickly raised to the proper temperature. Further, when the temperature of the liquid crystal is higher than the proper temperature, the heater 39 is stopped to blow cool air to the liquid crystal panel 4 to lower the temperature of the liquid crystal. By operating or stopping the heater 39 as described above, the temperature of the liquid crystal can be controlled, and further, the electric circuit board 29a can be always cooled.

Embodiment 6 FIG. 15 is a front view of a liquid crystal display device according to a sixth embodiment of the present invention seen through, FIG. 16 is a side view of FIG. 15, and FIG. 17 is a view of a duct of the liquid crystal display device according to the sixth embodiment of the present invention. It is a perspective view. In the figure, the same parts as those in the fifth embodiment are designated by the same reference numerals and the description thereof will be omitted. In addition, the basic configuration of the optical unit 7 and white light from the lamp 3 are separated into three primary colors of red, green and blue, and the light is modulated by the liquid crystal panel 4 corresponding to each color, and then combined again to create a color image. Since the method and the flow of air in the duct A23a are the same as those in the fifth embodiment, the description thereof will be omitted.

15, 16 and 17, liquid crystal panels 4r, 4g and 4b are arranged in a predetermined position in the optical unit 7 installed in the cabinet 13 while being held by the liquid crystal panel support member 26. . This liquid crystal panel 4
Air intake ports 9r, 9g corresponding to r, 4g, 4b,
9b and air outlets 10r, 10g, 10b are provided in the unit case 8 of the optical unit 7, and A23 is provided so as to cover the air inlets 9r, 9g, 9b.
a is attached. Further, electric circuit boards 29a and 29b for driving the liquid crystal panel 4 and the lamp 3 are provided so as to sandwich the optical unit 7. A blower fan 11 is provided at one end of the duct A23a,
The outside air is made to flow into the optical unit 7 from the air intake ports 9r, 9g, 9b as cold air through the intake duct A23a. In addition, the duct A23
The opening a for discharging outside the duct and the heater 39 are provided in a, and a part of the air flowing through the duct A23a passes through the opening for discharging outside the duct 31 and the electric circuit board 29a.
Liquid crystal panel 4r, by operating or stopping the heater 39 while
The air sent to 4g and 4b can be warm air or cold air. Further, the liquid crystal panel 4g for green is provided with a temperature sensing element 40 for observing the temperature near the liquid crystal panel 4g, and the temperature sensing element 40 converts the temperature into a voltage and outputs it as temperature information. You can Reference numeral 41 denotes a control circuit for automatically operating / stopping the heater 39 according to temperature information from the temperature sensing element, which is electrically connected to the heater 39.

Next, the operation will be described. White light into red,
A method of separating the light into green and blue and subjecting it to light modulation, and then synthesizing again to create a color image, and the outside air is taken in by the blower fan 11 to make cold air, and the liquid crystal panel 4 is cooled by the cold air through the duct A23a, while the duct A23a. By operating the heater 39 in the liquid crystal panel 4
The method of controlling the temperature of the liquid crystal panel 4 by applying warm air to it is the same as in the fifth embodiment. The sixth embodiment is the fifth embodiment
The difference is that, in addition to the heater 39, a temperature sensing element 40 for measuring the temperature of the liquid crystal panel 4 and a control circuit 41 are used to form a feedback system. The air taken in from the outside of the cabinet 13 by the blower fan 11 is a cold air, and a part of the air constantly cools the electric circuit board 29a through the duct outside exhaust opening 31. On the other hand, the cold air that further flows through the duct A23a passes through the heater 39 installation portion and enters the optical unit 7 through the air intake ports 10r, 10g, and 10b. The cold air that has flowed into the optical unit 7 pushes out the air inside the optical unit 7 and the liquid crystal panel 4
The temperature of r, 4g, 4b is changed. At this time, the temperature sensing element 40 installed on the liquid crystal panel 4g is not attached to the liquid crystal panel 4g.
The temperature of g is observed, and the temperature is converted into a voltage and sent to the control circuit 41 as temperature information. If the temperature information is lower than the proper temperature of the liquid crystal, the control circuit 41 activates the heater 39 to send warm air to the liquid crystal panels 4r, 4g, 4b to warm the liquid crystal panels 4r, 4g, 4b, and stop the heater 39 if the temperature is higher than the proper temperature. Then, cool air is blown into the liquid crystal panels 4r, 4g, 4b to cool the liquid crystal panels 4r, 4g, 4b. As described above, the heater 39, the temperature sensing element 40, and the control circuit 41 constitute a feedback system, so that the temperature of the liquid crystal panel 4 can be always maintained at an appropriate temperature. Even after the device is stopped, heat convection of the lamp 3
To prevent the temperature of the liquid crystal panel 4 from rising due to the action of conduction,
It can also be used to operate the blower fan 11 by the temperature sensing element 40 and the control circuit 41. Although the method of using one temperature sensing element 40 has been described in the sixth embodiment, the temperature sensing element 40 is provided for each of the liquid crystal panels 4r, 4g, and 4b, and the heater 39 is controlled according to the average temperature. May be.

Embodiment 7 FIG. 18 is a front view of the liquid crystal display device according to the seventh embodiment of the present invention seen through, FIG. 19 is a side view of FIG. 18, and FIG. 20 is a perspective view of an optical unit of the liquid crystal display device according to the seventh embodiment of the present invention. It is a figure. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Also, the basic configuration of the optical unit 7 and the lamp 3
The method for separating the white light from the three primary colors of red, green, and blue, performing the light modulation by the liquid crystal panel 4 corresponding to each color, and then synthesizing again to create a color image is the same as that in the first embodiment. Omit it.

18, 19, and 20, liquid crystal panels 4r, 4g, and 4b are arranged at predetermined positions in the optical unit 7 installed in the cabinet 13 while being held by the liquid crystal panel support member 26. . This liquid crystal panel 4
Air intake ports 9r, 9g corresponding to r, 4g, 4b,
9b and air outlets 10r, 10g, 10b are provided in the unit case 8 of the optical unit 7, and a duct B23b is attached so as to cover the air inlets 9r, 9g, 9b. The cabinet 13 has an intake hole 14, and the unit case 8 has a lamp house 20.
An air intake 9l for a lamp house is provided for taking in outside air. Further, electric circuit boards 29a and 29b for driving the liquid crystal panel 4 and the lamp 3 are provided so as to sandwich the optical unit 7. One end of the duct B23b is routed to the side surface of the lamp 3, and a warm air suction fan 12b is attached to the inside thereof.
The air warmed by the lamp 3 is exhausted to the outside of the lamp house 20 by the exhaust fan 12a and the warm air suction fan 12b. The warm air discharged by the warm air suction fan 12b reaches the liquid crystal panels 4r, 4g, 4b from the air intake ports 9r, 9g, 9b through the duct B23b, and warms the liquid crystal panels 4r, 4g, 4b. The hot air that warms the liquid crystal panels 4r, 4g, 4b is taken out from the outlet 10r,
10g, 10b goes out of the optical unit 7, and the cabinet 1 with the exhaust of the lamp from the exhaust fan 12a.
3 Exhausted to the outside.

Next, the operation will be described. White light into red,
The method for producing a color image by separating the light into green and blue, performing light modulation, and then synthesizing again is the same as in the first embodiment. The difference is that the heat of the lamp 3 is used to make liquid crystal panels 4r, 4g, 4b.
That is, it is configured to quickly raise the temperature of. In the liquid crystal display device, the lamp 3 is the screen 1
6 emits strong light and heat to increase the brightness. The air outside the cabinet 13 enters the lamp house 20 through the air intake hole 14 and the lamp house air intake port 9l to cool the lamp 3. Further, the air introduced into the lamp house 20 is warmed by the heat generated by the lamp 3, and is discharged from the lamp house 20 by the exhaust fan 12a and the warm air suction fan 12b. Of these, the warm air suction fan 12b sends the warm air to the duct B23b,
Liquid crystal panel 4r from the air intake ports 9r, 9g, 9b,
Send to 4g, 4b. Therefore, when the temperature of the liquid crystal panels 4r, 4g, 4b is lower than the proper temperature at the time of starting the apparatus, the warm air suction fan 12b is operated by a timer or the like (not shown) to heat the warm air generated by the lamp 3 to the liquid crystal. The liquid crystal panel 4 is provided by touching the panels 4r, 4g, and 4b.
The temperatures of r, 4g and 4b can be raised quickly.

Embodiment 8 FIG. 21 is a front view of the liquid crystal display device according to the eighth embodiment of the present invention seen through, FIG. 22 is a side view of FIG. 21, and FIG. 23 is an optical unit of the liquid crystal display device according to the eighth embodiment of the present invention. 24 is a perspective view of a drive mechanism for an opening / closing door of a liquid crystal display device according to an eighth embodiment of the present invention. In the figure, the same parts as those of the seventh embodiment are designated by the same reference numerals and the description thereof will be omitted. In addition, the basic configuration of the optical unit 7 and the white light from the lamp 3 are converted into red, green,
The method of separating the three primary colors of blue and performing the light modulation by the liquid crystal panel 4 corresponding to each color and then synthesizing them again to form a color image is the same as in the seventh embodiment, and therefore the description thereof is omitted.

21, FIG. 22, FIG. 23, and FIG. 24, the liquid crystal panels 4r, 4g, and 4b are held by the liquid crystal panel support member 26 at predetermined positions in the optical unit 7 installed in the cabinet 13. Has been done. Air intake 9 corresponding to these liquid crystal panels 4r, 4g, 4b
r, 9g, 9b and air outlets 10r, 10g, 10
b is provided in the unit case 8 of the optical unit 7, and a duct C23c is attached so as to cover the air intake ports 9r, 9g, 9b. Duct C2
A flap B32b that rotates in a φ1-φ2 direction about a rotation axis B33b is installed at an end of 3c and extends to a position above the exhaust fan 12a. The exhaust fan 12a removes the air warmed by the lamp 3 to the outside of the optical unit 7, and further to the exhaust hole 1 of the cabinet 13.
It is discharged from 5a to the outside. In addition to the exhaust holes 15a which are always open, the flap B32 is provided in the cabinet 13.
An exhaust hole 15b which is opened and closed by b is opened. When the flap B32b is opened in the φ1 direction, the exhaust hole 15b is closed by the flap B32b, and the duct C23c.
The entrance to is opened. As a result, a part of the warm air discharged from the exhaust fan 12a is discharged to the outside of the cabinet 13, but a part of the warm air is guided to the liquid crystal panels 4r, 4g, 4b via the duct C23c. On the other hand, flap B32
When b is closed in the φ2 direction, the inlet of the duct C23c is closed and the exhaust hole 15b is opened.
All of the warm air discharged is discharged outside the cabinet 13.

The rotating shaft B33b of the flap B32b is rotatably passed through the duct C23c, and the flap B32b is rotated.
The pin B42b planted in b is the groove C4 of the joint B35b.
3c is engaged. On the other hand, the joint B35b is the duct C2.
Pin 42c and pin 42d and groove D43 provided on 3c
d and E43e are engaged so as to slide in the y1-y2 direction, and one end is coupled to the shaft of the plunger B38b, thereby interlocking with the movement of the plunger B38b. The shaft of the plunger B38b is y1 by an electrical signal.
It is designed to expand and contract in the -y2 direction. Therefore, the movement of the joint B35b in the y1-y2 direction is caused by the flap B3.
2b can be rotated in the φ1-φ2 direction.

Next, the operation will be described. White light into red,
The method for producing a color image by separating the light into green and blue, performing light modulation, and then synthesizing again is the same as in the seventh embodiment. The present embodiment is different from the seventh embodiment in that the warm air discharged by the exhaust fan 12a can be arbitrarily taken into the liquid crystal panel 4.
That is, the liquid crystal panels 4r, 4g,
Since the temperature of 4b is lower than the proper temperature, the shaft of the plunger B38b is moved in the y1 direction within a certain period of time by an operation of a timer or the like (not shown). Then, the flap B32b is rotated in the φ1 direction via the joint B35b, and the warm air is guided to the liquid crystal panels 4r, 4g, 4b through the duct C23c. As a result, the temperature of the liquid crystal panels 4r, 4g, 4b can be raised. On the other hand, liquid crystal panels 4r, 4g,
If the temperature of 4b is higher than the proper temperature, the plunger B3
By moving 8b in the y2 direction, the flap B32b is closed in the φ2 direction, and the warm air is exhausted to the outside from the exhaust hole B15b without entering the duct C32c. Therefore, the warm air does not reach the liquid crystal panels 4r, 4g, and 4b to raise the temperature of the liquid crystal. As described above, the flap B3
By operating 2b, liquid crystal panels 4r, 4g, 4
The temperature of the liquid crystal of b can be controlled.

Embodiment 9 25 is a front view of a liquid crystal display device according to a ninth embodiment of the present invention seen through, FIG. 26 is a side view of FIG. 25, and FIG. 27 is a perspective view of an optical unit according to the ninth embodiment of the present invention. FIG. 14 is a conceptual diagram of a drive mechanism of an opening / closing door of a liquid crystal display device which is Embodiment 9 of the present invention.
In the figure, the same parts as those in the eighth embodiment are designated by the same reference numerals and the description thereof will be omitted. In addition, the basic configuration of the optical unit 7 and white light from the lamp 3 are separated into three primary colors of red, green and blue, and the light is modulated by the liquid crystal panel 4 corresponding to each color, and then combined again to create a color image. Since the method is the same as that of the eighth embodiment, the description is omitted.

25, 26, 27, and 28, the liquid crystal panels 4r, 4g, and 4b are held by the liquid crystal panel support member 26 at predetermined positions in the optical unit 7 installed in the cabinet 13. Has been done. Air intake 9 corresponding to these liquid crystal panels 4r, 4g, 4b
r, 9g, 9b and air outlets 10r, 10g, 10
b is provided in the unit case 8 of the optical unit 7, and the duct D23d is attached so as to cover the air intake ports 9r, 9g, 9b. Further, electric circuit boards 29a and 29b for driving the liquid crystal panel 4 and the lamp 3 are provided so as to sandwich the optical unit 7. A blower fan 11 is provided at one end of the duct D23d, and air taken in from the outside of the cabinet 13 is blown into the optical unit 7 through the duct D23d from the air intake ports 9r, 9g, 9b as cold air. Further, the duct D23d is provided with an opening 31 for discharging outside the duct between the blower fan 11 and the air intakes 9r, 9g, 9b, so that a part of the cool air flowing through the duct D23d is opened for discharging outside the duct. It is adapted to be fed into the electric circuit board 29a through 31. A flap A32a is provided in the duct outside discharge portion 31 so that the flow direction of the wind by the blower fan 11 is divided into the inside of the duct D23d and the electric circuit board 29a. The other end of the duct D23d has an exhaust fan 1 for discharging the air warmed by the lamp 3.
2a to the rear position, and the air discharged by the exhaust fan 12a is used as warm air for the liquid crystal panels 4r, 4
It can be sent to g, 4b. The cabinet 13 is provided with an exhaust hole 15a which is always open to exhaust the warm air discharged from the exhaust fan 11 and an exhaust hole 15b which is opened and closed by a flap B32b.

The flap A32a for switching the direction of the cool air blown by the blower fan 11 is a plunger A3.
It rotates in the θ1-θ2 direction by 8a. Plunger A
38a expands and contracts in the x1-x2 direction by an electric signal,
The movement of the plunger A38a depends on the joint A35a and the groove B.
It is transmitted to the pin A 42a by 43b. Pin A42
The a is erected at one end of the flap A32a that rotates in the θ1 and θ2 directions around the rotation axis A33a, and further engages with the groove B43b provided in the duct D23d. Therefore, the flap A32a rotates in the θ1-θ2 direction by the movement of the plunger A38a in the x1-x2 directions. When the flap A32a is closed in the θ1 direction, the cold air does not flow into the duct D23d but is discharged from the duct outside discharge opening 31 to the outside of the duct D23d.
9a can be cooled. Further, when the flap A32a is opened in the θ2 direction, the air flows through both the duct outside discharge opening 31 and the duct D23d, so that the electric circuit board 29a and the liquid crystal panels 4r, 4g, 4b can be cooled.
The flap B32b for controlling the flow of the warm air discharged by the exhaust fan 12a is φ1-φ by the plunger B38b.
It can move in two directions. The plunger B38b expands and contracts in the y1-y2 direction by an electric signal, and the plunger B38b
b moves through the joint B35b and the groove C43c to the pin B.
42b. Duct D23 for joint B35b
Grooves D43d and E43e are provided so as to move along the pins C42c and D42d provided in d. Pin B4
2b is erected at one end of a flap B32b that rotates in the φ1 and φ2 directions around the rotation axis B33b, and further engages with a groove C43c provided in the joint B35b. Therefore, when the flap B32b is opened in the φ1 direction, the exhaust hole 15b is closed by the flap B32b and the inlet to the duct D23d is opened. As a result, a part of the warm air discharged from the exhaust fan 12a is discharged to the outside of the cabinet 13 and the rest is guided to the liquid crystal panels 4r, 4g, 4b via the duct D23d. As a result, the liquid crystal panels 4r, 4g, 4b can be warmed. On the other hand, when the flap B32b is closed in the φ2 direction,
Since the inlet of the duct D23d is closed by the flap B32b and the exhaust hole 15b is opened, the exhaust fan 12
Since all the air discharged from a is discharged to the outside of the cabinet 13, the liquid crystal panels 4r, 4g, and 4b are not heated.

Next, the operation will be described. White light into red,
The method of producing a color image by separating the light into green and blue, performing light modulation, and then synthesizing again is the same as in the eighth embodiment. The ninth embodiment is different from the eighth embodiment in that the cool air by the blower fan 11 and the exhaust fan 12a are provided through the duct D23d.
That is, the warm air discharged by the method can be arbitrarily taken into the liquid crystal panel 4. The liquid crystal panel 4r, such as when the power of the device is turned on,
If the temperature of 4g and 4b is lower than the proper temperature, flap A
32a is operated in the θ1 direction, flap B32b is operated in the φ1 direction, that is, plunger A38a is operated in the X1 direction and plunger B38b is operated in the Y1 direction. Then, the flap A32a is θ1.
Since it is closed in the direction, the cold air does not flow into the duct D23d, so that the liquid crystal panels 4r, 4g, 4b are not cooled. Further, since the flap B32b is opened in the φ1 direction, a part of the warm air discharged from the exhaust fan 12a passes through the duct D23d and the liquid crystal panels 4r, 4g,
You are led to 4b. Thereby, the liquid crystal panels 4r, 4
g, 4b can be warmed. On the other hand, after a certain amount of time has passed since the device was turned on, the liquid crystal panels 4r, 4g, 4b
Is higher than the appropriate temperature, the flap A32a is operated in the θ2 direction, the flap B32b is operated in the φ2 direction, that is, the plunger A38a is operated in the X2 direction and the plunger B38b is operated in the Y2 direction, contrary to the above-described operation. Then flap A3
2a is open in the direction of θ2, so the cool air is duct D23.
The liquid crystal panels 4r, 4g, and 4b can be cooled by flowing to d. Further, when the flap B32b is closed in the φ2 direction, the entrance of the duct D23d is closed by the flap B32b and the liquid crystal panels 4r, 4g, 4b are not heated. Further, since the flap A 32a and the flap B 32b can be operated independently, cold air and hot air can be guided to the liquid crystal panels 4r, 4g, 4b, respectively.
The temperature control of r, 4g, and 4b can be finely performed.

Tenth Embodiment FIG. 29 is a perspective view showing a temperature control structure of a liquid crystal display device according to a tenth embodiment of the present invention. In the tenth embodiment, the optical arrangement and the duct air handling are the same as those in the ninth embodiment, and are shown in FIGS. 25, 26 and 27. The difference is that the flap A 32a and the flap B 32b are connected by a joint, and the opening and closing operations of the flap A 32a and the flap B 32b are interlocked. Therefore, the same parts as those of the ninth embodiment are designated by the same reference numerals and the description thereof will be omitted.

25, 26, 27 and 29, liquid crystal panels 4r, 4g and 4b are attached to the liquid crystal panel support member 26 at predetermined positions in the optical unit 7 installed in the cabinet 13. . Air intake ports 9r, 9 corresponding to the liquid crystal panels 4r, 4g, 4b
g, 9b and air outlets 10r, 10g, 10b are provided in the unit case 8 of the optical unit 7,
A duct D23d is attached so as to cover the air intake ports 9r, 9g, 9b. This duct D23
On the blower fan 11 side of d, a flap A32a that rotates around a rotation axis A33a is installed in the vicinity of the duct outside discharge opening 31. A pin A42a is planted at one end of the flap A32a, and the groove A43a of the duct D23d is provided.
And is engaged with the groove B43b of the joint C35c. A flap B32b that rotates about a rotation shaft B33b is attached to the other end of the duct D23d near the exhaust fan 12a. A pin B42b is planted at one end of the flap B32b, and a groove C43 of the joint E35e is provided.
c is engaged.

The joint E35e has a groove D43d and a groove E.
43e is formed, and the movement of the joint E35e is restricted in the arrow direction x1-x2 in the figure by the engagement of the pin C42c and the pin D42d that are planted in the duct D23d. The joint E35e is movably connected to the plunger C38c via the joint D35d and the joint C35c. Therefore, the plunger C38
When the shaft of c is expanded and contracted, the flap A32a is rotated by θ1 via the joint C35c engaged with the shaft and the pin 42a.
-Rotate in the θ2 direction. The force is also transmitted to the joint D35d, and the joint D35d rotates about the rotation axis C33c that is erected in the duct D23d to slide the joint E35e in the arrow x1 direction or the arrow x2 direction so that the flap B32b has a diameter of φ1. -Rotate in φ2 direction. Plunger C38c contracts in the x1 direction, and joint C35c becomes x
When the joint E35e slides in the x2 direction in one direction, the flap A32a rotates in the θ1 direction and the flap B32a rotates in the other direction.
32b rotates in the φ1 direction. At this time, the blower fan 11
The cold air sent by the liquid crystal panels 4r, 4g, 4
However, the hot air from the exhaust fan 12a reaches the liquid crystal panels 4r, 4g, and 4b and does not reach b.
Can be warmed. Also, the plunger C38c is x
When extending in two directions, the flap A32a rotates in the θ2 direction and the flap B32b rotates in the φ2 direction. Then
Since only the cold air reaches the liquid crystal panels 4r, 4g, 4b, the liquid crystal panels 4r, 4g, 4b can be cooled.

Next, the operation will be described. White light into red,
A method of separating the light into green and blue and subjecting it to light modulation by the liquid crystal panel 4 and then synthesizing again to create a color image, and a method of applying cool air to the liquid crystal panel 4 through the duct D23d, and also applying hot air that has passed through the lamp 3 to the duct D23d. Applying the liquid crystal panel to the liquid crystal panel through the same way as in the ninth embodiment. The difference is that a flap A32a provided near the blower fan 11 and a flap B32b provided near the exhaust fan 12 are connected by joints C35c, D35d, E35e.
This is the point that one plunger C28c creates the rotational movement of the two flaps A32a and B32b. That is, when the temperature of the liquid crystal panels 4r, 4g, and 4b is lower than the appropriate temperature, the shaft of the plunger C28c moves in the x1 direction, and the flap A32a serves as the air intake port 9 of the unit case 8.
The flaps B32b are opened in the direction φ1 so that cold air does not pass through r, 9g, and 9b, and the hot air from the lamp 3 is opened through the air intake ports 9r, 9g, and 9b. Therefore, only the hot air hits the liquid crystal panels 4r, 4g, 4b to raise the temperature. In addition, the liquid crystal panels 4r, 4
When the temperatures of g and 4b rise above the usable range, the shaft of the plunger C28c moves in the x2 direction. By this operation, the flap A32a is moved to the unit case 8
The air intakes 9r, 9g, and 9b are opened in the θ2 direction so that cold air is passed. On the other hand, the flap B 32b is closed in the φ2 direction so that the warm air from the lamp 3 does not pass through the air intake ports 9r, 9g, 9b. Therefore, the liquid crystal panel 4
r, 4g, and 4b are cooled only by the cold air. In this way, by repeating the above two operations, the liquid crystal panel 4r,
4g, 4b can be maintained within the working temperature range.

[0075]

Since the present invention is configured as described above, it has the following effects.

The positions of the blower fan and the intake holes can be arbitrarily selected, and the design can be freely designed.

Further, since the flow of the wind is smooth and the noise is eliminated, the fan noise is reduced.

Further, since the air volume can be appropriately distributed by the positions of the plurality of liquid crystal panels to efficiently apply the air to the liquid crystal panels, the liquid crystal panels can be uniformly cooled and the viscosity of the liquid crystal is prevented from lowering. As a result, the transmittance with respect to the applied voltage is stable, so that a stable color is obtained.

Further, since the air flowing through the duct can be distributed to a place other than the liquid crystal panel installation portion to be cooled,
The entire device can be cooled efficiently.

Further, since the wind can be blown or stopped, the temperature of the liquid crystal panel can be controlled and the projected image can be stabilized.

When the apparatus is started up, the heater installed in the duct sends warm air to warm the liquid crystal panel, increase the viscosity of the liquid crystal, stabilize the transmittance with respect to the applied voltage, and project with a normal color. .

Further, since the heater installed in the duct is turned on and off according to the information of the temperature sensing element, the cold air and the hot air can be switched and sent, and the liquid crystal panel can be controlled to a predetermined temperature. As a result, it is possible to project a normal image while keeping the viscosity of the liquid crystal constant and stabilizing the transmittance with respect to the applied voltage.

Further, since the liquid crystal panel is warmed by the heat of the light source, the viscosity of the liquid crystal can be quickly lowered when the temperature of the liquid crystal panel is low when the apparatus is started up, and the transmittance with respect to the applied voltage can be stabilized. Can project normal images.

Further, since the fan for cooling the light source is used as a means for sending the warm air of the light source section, a device having a low cost and a good space factor can be obtained.

Further, since the flap is provided so as to take in the warm air warmed by the light source portion at a proper time, the temperature of the liquid crystal panel can be controlled.

Further, since the outside air from the intake hole and the warm air from the light source section can be sent to the liquid crystal panel installation section while being switched by the opening / closing door, the temperature of the liquid crystal panel can be kept constant. As a result, the viscosity of the liquid crystal becomes constant, the transmittance with respect to the applied voltage can be stabilized, and a normal image can be projected in all the states from the start-up to the projection.

Further, by connecting the opening / closing doors provided in each of the outside air duct and the warm air duct with a joint, the two doors can be opened and closed by one driving source in conjunction with each other, so that the cost and the space factor are reduced. In addition to being improved, the opening and closing operation is correct and reliability is improved.

[Brief description of the drawings]

FIG. 1 is a front view of a liquid crystal display device according to a first embodiment of the present invention seen through.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view in which an optical unit of the liquid crystal display device according to the first embodiment of the present invention is seen through.

FIG. 4 is a perspective view of an optical unit of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 5 is a front view of the liquid crystal display device according to the second embodiment of the present invention seen through.

FIG. 6 is a transparent front view of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a perspective view of an optical unit of a liquid crystal display device which is Embodiment 3 of the present invention.

FIG. 9 is a transparent front view of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 10 is a side view of FIG.

FIG. 11 is a perspective view of an optical unit of a liquid crystal display device which is Embodiment 4 of the present invention.

FIG. 12 is a conceptual diagram of a drive mechanism for an opening / closing door of a liquid crystal display device that is Embodiment 4 of the present invention.

FIG. 13 is a front view of a liquid crystal display device according to a fifth embodiment of the present invention seen through.

FIG. 14 is a side view of FIG.

FIG. 15 is a transparent front view of a liquid crystal display device according to a sixth embodiment of the present invention.

FIG. 16 is a side view of FIG.

FIG. 17 is a perspective view in which a duct of a liquid crystal display device according to a sixth embodiment of the present invention is seen through.

FIG. 18 is a front view of a liquid crystal display device according to a seventh embodiment of the present invention seen through.

FIG. 19 is a side view of FIG. 18;

FIG. 20 is a perspective view of an optical unit of a liquid crystal display device which is Embodiment 7 of the present invention.

FIG. 21 is a front view of a liquid crystal display device according to an eighth embodiment of the present invention seen through.

22 is a side view of FIG. 21. FIG.

FIG. 23 is a perspective view of an optical unit of a liquid crystal display device which is Embodiment 8 of the present invention.

FIG. 24 is a conceptual diagram of a drive mechanism for an opening / closing door of a liquid crystal display device which is Embodiment 8 of the present invention.

FIG. 25 is a transparent front view of a liquid crystal display device according to a ninth embodiment of the present invention.

FIG. 26 is a side view of FIG. 25.

FIG. 27 is a perspective view of an optical unit of a liquid crystal display device which is Embodiment 9 of the present invention.

FIG. 28 is a conceptual diagram of a drive mechanism for an opening / closing door of a liquid crystal display device which is Embodiment 9 of the present invention.

FIG. 29 is a perspective view showing a temperature control structure of a liquid crystal display device which is Embodiment 10 of the present invention.

FIG. 30 is a cross-sectional view showing an optical unit portion of a conventional liquid crystal display device.

FIG. 31 is a cross-sectional view showing another example of a conventional liquid crystal display device.

[Explanation of symbols]

3 lamps, 4 liquid crystal panels, 7 optical units, 8
Unit case, 9 air inlet, 10 air outlet, 11 blower fan, 12a exhaust fan, 12b
Hot air intake fan, 14 intake holes, 15 exhaust holes, 16
Screenon, 17 total reflection mirror, 18 dichroic mirror, 23 duct, 28 optical path, 29 electric circuit board, 31 duct outside discharge opening, 32 flap, 33 rotating shaft, 35 joint, 38 plunger,
39 heater, 40 temperature sensing element, 41 control circuit.

Claims (10)

[Claims] 1. A liquid crystal display device in which light from a light source is projected on a liquid crystal panel, and a display image on the liquid crystal panel is enlarged and projected on a screen by a projection lens, and an intake hole and an exhaust hole are provided in a cabinet of the display device. A liquid crystal display device characterized in that a blower fan is arranged at a position distant from the panel installation portion, and a duct for guiding air from the blower fan to the liquid crystal panel installation portion is provided. 2. A liquid crystal display device in which light from a light source is projected on a liquid crystal panel and a display image of the liquid crystal panel is enlarged and projected on a screen by a projection lens, and an intake hole and an exhaust hole are provided in a cabinet of the display device. A blower fan is arranged at a position away from the panel installation portion, a duct for guiding the wind from the blower fan to the liquid crystal panel installation portion is provided, and a deflection wall for distributing the wind is provided in the duct. Liquid crystal display device. 3. A liquid crystal display device in which light from a light source is projected on a liquid crystal panel, and a display image of this liquid crystal panel is enlarged and projected on a screen by a projection lens, and an intake hole and an exhaust hole are provided in a cabinet of the display device. A liquid crystal display device characterized in that a blower fan is arranged at a position distant from the panel installation portion, and an opening is provided in a duct for guiding air from the blower fan to the liquid crystal panel installation portion in addition to the liquid crystal panel installation portion. 4. A liquid crystal display device in which light from a light source is projected on a liquid crystal panel, and a display image on the liquid crystal panel is enlarged and projected on a screen by a projection lens, wherein an intake hole and an exhaust hole are provided in a cabinet of the display device. An air blower fan is placed away from the panel installation part, and an opening other than the liquid crystal panel installation part is provided in the duct that guides air from the fan to the liquid crystal panel installation part, and it can be opened and closed near the opening. A liquid crystal display device characterized by having a door attached. 5. A liquid crystal display device in which light from a light source is projected on a liquid crystal panel, and a display image on the liquid crystal panel is enlarged and projected on a screen by a projection lens, wherein an intake hole and an exhaust hole are provided in a cabinet of the display device. A blower fan is arranged at a position away from the panel installation part, and a duct for guiding the wind from the blower fan to the liquid crystal panel installation part is installed,
A liquid crystal display device characterized in that an opening is provided in the duct in addition to the liquid crystal panel installation portion, and a heating element such as a heater is installed in the duct. 6. A liquid crystal display device in which light from a light source is projected on a liquid crystal panel, and a display image of this liquid crystal panel is enlarged and projected on a screen by a projection lens, and a cabinet of the display device is provided with an intake hole and an exhaust hole. A blower fan is arranged at a position away from the panel installation part, and a duct for guiding the wind from the blower fan to the liquid crystal panel installation part is installed,
A liquid crystal characterized in that an opening is provided in the duct other than the liquid crystal panel installation part, a heating element such as a heater is installed in the duct, and a temperature sensing element is attached to the liquid crystal panel to control the operation of the heating element. Display device. 7. A liquid crystal display device in which light from a light source is projected on a liquid crystal panel, and a display image on the liquid crystal panel is enlarged and projected on a screen by a projection lens. A liquid crystal display device, characterized in that a duct is installed between the liquid crystal display unit and the liquid crystal installation unit, and a blower is provided for flowing hot air from the light source unit to the liquid crystal panel. 8. A liquid crystal display device in which light from a light source is projected on a liquid crystal panel, and a display image of the liquid crystal panel is enlarged and projected on a screen by a projection lens, wherein an intake hole and an exhaust hole are provided in a cabinet of the display device. A liquid crystal display device characterized in that a duct is attached between the vicinity of an exhaust port of a cooling fan and a liquid crystal panel installation portion, and an openable / closable door is installed in the duct. 9. A liquid crystal display device in which light from a light source is projected on a liquid crystal panel, and a display image on the liquid crystal panel is enlarged and projected on a screen by a projection lens, and an intake hole and an exhaust hole are provided in a cabinet of the display device. An air blower fan is arranged at a position away from the panel installation portion, an opening is provided in a duct for guiding air from the air blower fan to the liquid crystal panel installation portion in addition to the liquid crystal panel installation portion, and the warm air of the light source unit is supplied to the liquid crystal panel. A liquid crystal display device characterized in that a duct is also installed between the light source part and the liquid crystal installation part so that air can be blown to the door, and a door that can be opened and closed is installed in both ducts. 10. The light from the light source is projected on a liquid crystal panel,
In a liquid crystal display device in which a display image of this liquid crystal panel is enlarged and projected on a screen by a projection lens, an intake hole and an exhaust hole are provided in a cabinet of the display device, and a blower fan is arranged at a position apart from the liquid crystal panel installation portion, and the blower concerned The duct that guides the air from the fan to the liquid crystal panel installation part has an opening in addition to the liquid crystal panel installation part, and also between the light source part and the liquid crystal installation part so that the warm air of the light source part is blown to the liquid crystal panel. A liquid crystal display device, characterized in that ducts are installed, doors that can be opened and closed are installed in both ducts, and the doors that can be opened and closed are connected by a joint so that the opening and closing operations of the doors are linked.