JPH0522237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device for forming a large screen display device using liquid crystal.

[Conventional technology]

FIG. 7 is a front view of a liquid crystal display unit disclosed in, for example, Japanese Unexamined Patent Publication No. 59-50425, FIG. 8 is a side sectional view thereof, and FIG. 9 is an enlarged sectional view of the liquid crystal panel. In the figure, reference numeral 10 denotes a liquid crystal panel, which consists of a glass substrate 2 on which a transparent common electrode 1 is formed on one surface, and a glass substrate 4 on which a large number of independent transparent electrodes 3 of different areas are formed on one surface. The electrode surfaces of each electrode are arranged to face each other, and a liquid crystal 6 is hermetically sealed between them using a sealing material 5. Further, on the other side of the glass substrate 2, red electrodes corresponding to the plurality of electrodes 3 of the glass substrate 4 are arranged. A color filter 7 and a light-shielding mask 8 made of (R), green (G), and blue (B) are formed by printing, etc., and a polarizing plate 9 is pasted on the outside of the glass substrates 2 and 4 with the polarization axes being the same. A liquid crystal panel 10 is configured. Here, a large number of pixels 101 each consisting of a set of three transparent electrodes 3 and a section of R, G, and B color filters 7 corresponding thereto are assembled to form a liquid crystal panel 10, and a liquid crystal display incorporating the liquid crystal panel 10. A large number of units 20 are combined to form a large screen display.

In the liquid crystal display unit 20, a housing 11 which also serves as a reflector has a diffuser plate 12 attached to the front surface for scattering light, and a plurality of liquid crystal panels 10 are fixed to the front surface of the diffuser plate 12 with a transparent adhesive. There is. In addition, the housing 11 has an electronic component 1 for driving the liquid crystal.
3 is mounted on the printed circuit board 14,
The liquid crystal panel 10 and the printed circuit board 14 are electrically connected by a flexible printed circuit board 15. 16 is a lamp arranged on the rear surface of the housing 11.

In the above configuration, since the glass substrates 2 and 4 are sandwiched between the polarizing plates 9 having the same polarization axis on the outside, the light from the lamp 16 is blocked when the common electrode 1 and the electrode 3 are under no voltage; When is being applied, light is transmitted, colored by the color filter 7, and radiated to the outside for display.

FIG. 10 is a plan sectional view of a conventional liquid crystal display unit, and FIG. 11 is a perspective view of the liquid crystal display device. The liquid crystal display unit 20 has a housing 11 that also serves as a reflector.
A lamp 16 is disposed inside, and the housing 11 has a sealed structure. In the liquid crystal display device 30, such a liquid crystal display unit 20 is attached to a frame 21 for a large screen.
They are stacked in multiple rows to form a large-screen display device.

[Problem that the invention seeks to solve]

However, in such a conventional liquid crystal display device, since the lamp 16 has a sealed structure, the heat of the lamp 16 is trapped and the liquid crystal panel 10 is
is affected by heat and becomes a factor of deterioration. When a large number of liquid crystal display units 20 are attached to form a large screen, the liquid crystal display units 20 may
A temperature difference occurs between the two, and this causes a difference in LCD characteristics between the liquid crystal display units 20, making it impossible to obtain a good screen. In addition, if a fan is installed in the frame 21 for cooling, dust will enter the device and
There were problems such as poor cooling efficiency.

This invention is intended to solve the above problems, and is capable of efficiently cooling the liquid crystal display unit to prevent the liquid crystal panel from deteriorating due to thermal effects, as well as preventing dust from entering the device. I can,
Moreover, the object is to obtain a liquid crystal display device that can provide an excellent screen without causing any difference in LCD characteristics even when the screen is enlarged.

[Means for solving problems]

The liquid crystal display device of the present invention includes a liquid crystal display unit having a built-in lamp and an air supply port and an air exhaust port, a frame to which a plurality of liquid crystal display units are attached, and a frame that supplies air to the air supply ports of the plurality of attached liquid crystal display units. an air supply duct that discharges air from the exhaust ports of the plurality of liquid crystal display units, an exhaust duct that exhausts the air from the exhaust ports of the plurality of liquid crystal display units, and a heat pipe type heat exchanger and air blower that cools the exhaust air from the exhaust duct and supplies it to the air supply duct. , and a guide for guiding cooling air discharged from the heat dissipation section of the heat pipe to the front surface of the liquid crystal display unit.

[Effect]

In the liquid crystal display device of the present invention, a plurality of liquid crystal display units are mounted on a frame, their air supply ports are connected to an air supply duct, and their exhaust ports are connected to an exhaust duct. In this state, the exhaust air from the exhaust duct is cooled by a heat pipe, and then the air is supplied from the air supply duct by a blower.The cooled supply air enters the liquid crystal display unit from the air supply port, and then from the lamp. Cools the LCD display unit by removing the heat generated.
The air is exhausted from the exhaust port into the exhaust duct and circulated. Cooling air discharged from the heat dissipation section of the heat pipe is guided to the front of the liquid crystal display unit by a guide, and further cools the liquid crystal panel disposed in front of the liquid crystal display unit.

In this way, the liquid crystal display unit is efficiently cooled and deterioration of the liquid crystal panel due to heat is prevented. Furthermore, the temperature difference between each liquid crystal display unit is eliminated, and the LCD characteristics between the liquid crystal display units are constant, resulting in an excellent screen. Furthermore, since cooling gas is circulated within the device, dust from outside air is prevented from entering the device.

〔Example〕

Fig. 1 is a perspective view showing an outline of the liquid crystal display device of the embodiment, Fig. 2 is a perspective view of its module, Fig. 3 is a side sectional view thereof, Fig. 4 is a front sectional view, and Fig. 5 is a plan sectional view. Figures 6 and 6 are partial perspective views, and in the figures, the same reference numerals as in Figures 7 to 11 indicate the same or corresponding parts.

The liquid crystal display device 30 is a module 4 in which a plurality of liquid crystal display units 20 are stacked and attached in the vertical direction.
0 are housed in a frame 21 for a large screen, arranged in a horizontal direction. In the module 40, a liquid crystal display unit 20 is attached vertically to a box-shaped case 31, and is detachably attached to the frame 21.

The liquid crystal display unit 20 basically has almost the same structure as shown in FIGS. 7 to 11, but the lamp 16 on one side is attached to the base of the housing 11 of the liquid crystal display unit 20. An air supply port 22 is formed around the lamp 16, and an exhaust port 23 is formed around the lamp 16 on the opposite side. An air supply duct 24 is provided on the rear surface of the case 31 so as to be connected to the air supply ports 22 of the liquid crystal display units 20 in the vertical direction through the openings 24a when a plurality of liquid crystal display units 20 are attached. Similarly, the exhaust duct 25 is connected to the exhaust port 23 through the opening 25a.
is provided. At the lower part of the case 31, an air blower 26 is provided below the air supply duct 24.

A heat pipe 28 having fins 27 is provided in the upper part of the case 31, and its cooling part 28a is arranged above the exhaust duct 25, and the heat radiating part 28
b is placed in the heat radiation chamber 29. A blower 32 is provided above the heat radiation chamber 29. In addition, a guide 33 is provided with a taper projecting to the front side of the lower part of the heat radiation chamber 29 so that the cooling air discharged from the heat radiation chamber 29 flows along the liquid crystal panel 10 attached to the front surface of the liquid crystal display unit 20. It is set up in a shape.

In the liquid crystal display device configured as described above, a plurality of liquid crystal display units 20 are attached to the case 31, their air supply ports 22 are connected to the air supply duct 24, and their exhaust ports 23 are connected to the exhaust duct 25. death,
A module 40 is formed. Then, this module 40 is housed in the frame 21 and the liquid crystal display device 3 is installed.
form 0.

In this state, the blower 32 blows air into the heat radiation chamber 29, and the blower 26 blows air into the air supply duct 2.
When air is supplied from the air supply port 22 and exhausted from the exhaust duct 25, the air is supplied to the liquid crystal display unit 20 from the air supply port 22.
The liquid crystal display unit 20 is cooled by removing the heat generated from the lamp 16, and is exhausted from the exhaust port 23 to the exhaust duct 25. The high-temperature exhaust gas is cooled by the cooling section 28a of the heat pipe 28, passes through the case 31, is supplied to the air supply duct 24 by the blower 26, and is circulated.

In the heat pipe 28, the refrigerant that has taken heat from the exhaust gas is vaporized in the cooling part 28a, and the heat radiating part 28
It radiates heat in b, liquefies, and returns to the cooling section 28a. In the heat radiation chamber 29, the air blown by the blower 32 removes heat from the heat pipe 28 and is cooled.
Since the air that has cooled the heat pipe 28 is lower temperature than the liquid crystal display unit 20, it is directly transferred to the guide 3.
3 to flow along the front surface of the liquid crystal display unit 20 to cool the liquid crystal panel 10 disposed in front of the liquid crystal display unit 20.

In this way, the liquid crystal display unit 20 is efficiently cooled by the heat pipe 28 and its cooling air, and deterioration of the liquid crystal panel 10 due to heat is prevented. In addition, each liquid crystal display unit 20 and liquid crystal panel 10 are uniformly cooled and there is no temperature difference, and the LCD characteristics between the liquid crystal display units 20 are constant.
You get a great screen. Furthermore, the supply air and exhaust air are circulated within the device for cooling, and dust does not enter from the outside. Moreover, if the blower 26 and the heat pipe 28 are separated vertically, the space balance will be improved.

Note that in the above embodiment, two lamps are used as the lamp 16.
Although several point light sources are shown, one or more line light sources may be used. Additionally, a liquid crystal display unit 20 in the vertical direction is used as an air supply duct 24 and an exhaust duct 25.
Although the connection is shown here, it may also be connected to the horizontal liquid crystal display unit 20.

〔Effect of the invention〕

According to this invention, the liquid crystal display unit is provided with an air supply port and an exhaust port, which are connected to an air supply duct and an exhaust duct to circulate the gas cooled by the heat pipe, and to circulate the cooled air through the heat pipe. Since the front of the LCD display unit is cooled, it is possible to efficiently cool the LCD panel and prevent it from deteriorating due to thermal effects, and there is no difference in LCD characteristics even when the screen is enlarged. , an excellent screen can be obtained, and dust can be prevented from entering the device.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an outline of the liquid crystal display device of the embodiment, Fig. 2 is a perspective view of its module, Fig. 3 is a side sectional view thereof, Fig. 4 is a front sectional view, and Fig. 5 is a plane sectional view. Fig. 6 is a partial perspective view, Fig. 7 is a front view of the liquid crystal display unit, Fig. 8 is a side sectional view thereof, Fig. 9 is an enlarged sectional view of the liquid crystal panel, and Fig. 10 is a conventional FIG. 11 is a plan sectional view of the liquid crystal display unit and a perspective view of the liquid crystal display device. In each figure, the same reference numerals indicate the same or equivalent parts, 10 is the liquid crystal panel, 20 is the liquid crystal display unit, 21 is the frame, 22 is the air supply port, 23 is the exhaust port, 24 is the air supply duct, and 25 is the exhaust air. duct,
26, 32 are blowers, 28 are heat pipes, 29
is a heat dissipation chamber, 30 is a liquid crystal display device, 31 is a case,
33 is a guide, and 40 is a module.

Claims (1)

[Claims] 1. A liquid crystal display unit having a built-in lamp and an air supply port and an air exhaust port, a frame to which a plurality of liquid crystal display units are attached, and an air supply port to the air supply ports of the plurality of attached liquid crystal display units. an air supply duct for discharging air from the exhaust ports of the plurality of liquid crystal display units; a heat pipe heat exchanger and a blower for cooling the exhaust air from the exhaust duct and supplying the air to the air supply duct; A liquid crystal display device comprising: a guide for guiding cooling air discharged from a heat dissipating section of a heat pipe to a front surface of a liquid crystal display unit. 2. The liquid crystal display device according to claim 1, wherein the air supply and exhaust ducts are provided vertically or horizontally.