JPH04355491A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To reduce noise by supplying an air for cooling a liquid crystal display unit from the outside of a device through an air filter by a blower, cooling the unit through an intake duct, and then exhausting the air to the outside of the device through an exhaust duct. CONSTITUTION:A cooling air taken from the outside through an air filter 19 is sent into an intake duct 11 by a blower 14. Each liquid crystal unit 1 takes the air through an air intake hole within the intake duct 1 to cool a lamp. The air taking the heat of the lamp is sent into an exhaust duct 12 through an exhaust port and exhausted from an exhaust port 12b. Since the cooling air is taken from and exhausted to the outside, and the air is never circulated, noise is reduced. Further, since a miniature blower 14 can be sufficiently used, the noise can be further minimized.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device that uses liquid crystal to form a large screen display device in a building or the like.

0002

2. Description of the Related Art FIG. 6 is a schematic perspective view showing a conventional liquid crystal display device, and FIGS. 7 to 10 are a perspective view, a side sectional view, a front sectional view, and a plan sectional view showing modules constituting the device. It is a diagram. In FIG. 6, 1 is a liquid crystal display unit that becomes each pixel of the display device, and 2 is a module in which a plurality of liquid crystal display units 1 are stacked vertically and attached. 3 is a frame that accommodates a plurality of modules 2 arranged in the horizontal direction, and 4 is a liquid crystal display device that is formed by accommodating the modules 2 in the frame 3.

In FIGS. 7 to 10, reference numeral 5 denotes a box-shaped case of a module 2 to which a liquid crystal display unit 1 is attached, and is detachably attached to the frame 3. 6
is a casing of the liquid crystal display unit 1, and 7 is a liquid crystal panel arranged on the front side of the casing 6. 8 is a lamp attached to the base of the casing 6, 9 is an intake port formed around the lamp 8, and 10 is an exhaust port also formed around the lamp 8. 11 is an intake duct connected to the intake port 9 of each liquid crystal display unit 1 through an opening 11a, and 12 is an exhaust duct connected to the exhaust port 10 through an opening 12a. Reference numeral 14 denotes a blower that is disposed below the intake duct 11 via the vibration-proofing spacer 13 and circulates cooling air within the module 2. 15
is a heat radiation chamber arranged in front of the exhaust duct 12 at the top of the module 2. 16 is a heat pipe whose heat radiating part 16a is arranged in the heat radiating chamber 15 and its cooling part 16b is arranged in the exhaust duct 12, and 17 is a fin attached to the heat pipe 16. 18 is the heat radiation chamber 15
The heat pipe 16 in the heat dissipation chamber 15 is arranged on the upper part of the heat pipe 16
This is a blower that sends outside air to cool the heat radiating section 16b.

Next, the operation will be explained. As the blower 14 operates, air cooled by the cooling section 16b of the heat pipe 16 is supplied to the intake duct 11. This cooled air enters the housing 6 through the openings 11a of the intake duct 11 and the intake port 9, removes the heat generated by the lamp 8, and cools the liquid crystal display unit 1. The air that has become hot after absorbing the heat from the lamp 8 is sent to each exhaust port 10 and exhaust duct 1.
The air is exhausted to the exhaust duct 12 through the opening 12a of No. 2. The hot air exhausted into the exhaust duct 12 passes between the fins 17 attached to the cooling part 16b of the heat pipe 16 at the upper part of the exhaust duct 12, and heat is removed in the process.

[0005] The air, which has been deprived of heat and has become cold, is again supplied to the intake duct 11 by the action of the blower 14. On the other hand, in the heat pipe 16, when heat is removed from the heated air in the cooling section 16b, the refrigerant is vaporized and sent to the heat radiation section 16a. In the heat radiation section 16a, the refrigerant is cooled by outside air sent from the blower 18, and the vaporized refrigerant is liquefied and returned to the cooling section 16b. By repeating these operations, the heat generated by the lamp 8 is discharged to the front of the liquid crystal display device 4.

[0006]

[Problems to be Solved by the Invention] Since the conventional liquid crystal display device is constructed as described above, in the liquid crystal display device 4 installed in a low-noise place such as inside a building, cooling is required in the module 2. a blower 14 that circulates air for use;
Blower 1 that sends outside air to heat radiation part 16a of heat pipe 16
8 and the noise generated by the blower 18 when outside air passes through the heat dissipation section 16a of the heat pipe 16, there is a problem in that the noise is felt to be loud in front of the liquid crystal display device 4.

The present invention was made to solve the above-mentioned problems, and provides a liquid crystal display that can reduce the noise felt at the front side of the device without impairing the cooling of the liquid crystal display unit. The purpose is to obtain equipment.

[0008]

[Means for Solving the Problems] The liquid crystal display device according to the present invention sucks air for cooling the liquid crystal display unit into an intake duct from outside the module using a blower, and uses the exhaust air that has removed heat from the liquid crystal display unit to exhaust air. The structure is such that the gas is discharged to the outside of the module through a duct.

[0009]

In the liquid crystal display device of the present invention, the liquid crystal display unit is cooled by air outside the module, so a small blower can be used, and the noise generated can be reduced.

0010

[Example] Example 1. Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, 1 is a liquid crystal display unit, 2 is a module, 5 is a case, 11 is an intake duct, 12 is an exhaust duct, 13 is a vibration isolation spacer, 14
is a blower, which has substantially the same configuration as in FIGS. 6 to 10. Reference numeral 19 denotes an air filter provided via the blower 14 and the vibration-proofing spacer 13 to take in outside air. Reference numeral 12b is an exhaust port provided at the upper end of the exhaust duct 11 for exhausting air from the back surface of the module 2 to the outside.

Next, the operation will be explained. Cooling air taken in from the outside through the air filter 19 is sent into the intake duct 11 by the blower 14. Each liquid crystal display unit 1 takes in air from an intake duct 11 through an intake port 9 (see FIG. 10) to cool the lamp 8. The air that has taken the heat from the lamp 8 is sent into the exhaust duct 12 through the exhaust port 10 and exhausted to the outside through the exhaust port 12b.

According to the above, by taking in cooling air from the outside and exhausting it to the outside, there is less noise because the air is not circulated using a heat pump as in the past.
Further, since the blower 14 may also be small, noise can be further reduced.

Example 2. In this embodiment, as shown in FIGS. 2 and 3, a wind receiver 20 is provided approximately in the middle of the intake duct 11. In the case of Embodiment 1 shown in FIGS. 1 and 2, a large amount of air sent from the blower 14 flows to the liquid crystal display unit 1 installed at the top, and air flows to the liquid crystal display unit 1 at the bottom (especially the bottom stage). There is a possibility that a phenomenon in which almost no water flows into the water may occur.

In this second embodiment, since the wind receiver 20 having the shape shown in the figure is provided, cooling air is evenly sent to the liquid crystal display units 1 installed in the vertical direction.
The surface temperature of the liquid crystal panel becomes uniform, making it possible to obtain a clear screen with less color unevenness. The effect of this wind catcher 20 has been significantly confirmed through experiments.

Example 3. In this third embodiment, as shown in FIG.
9 is provided on the back side of the module 2.

In this way, by installing the blower 14 that sends cooling air into the module 2 on the back side of the module 2, the air flow noise generated at the suction port and the discharge port of the blower 14 and the drive of the blower 14 can be reduced. The noise generated by the electric motor is propagated to the back side of the liquid crystal display device via the module 2, so that the module 2 itself becomes a soundproof wall, and the noise can be reduced on the front side of the liquid crystal display device.

[0017]

[Effects of the Invention] As described above, according to the present invention, air for cooling each liquid crystal display unit in the module is taken in from the outside by a blower, cooled through the intake duct, and then sent to the outside from the exhaust duct. Since it is configured to exhaust air, it is possible to use a small blower without circulating the air as in the conventional case, which reduces noise generation and achieves the effect of reducing noise. .

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a plan side view of the device.

FIG. 3 is a side sectional view showing another embodiment of the device.

FIG. 4 is a plan sectional view showing another embodiment of the device.

FIG. 5 is a side sectional view showing still another embodiment of the device.

FIG. 6 is a perspective view showing a conventional liquid crystal display device.

FIG. 7 is a perspective view of a module of the device.

FIG. 8 is a side sectional view of the module.

FIG. 9 is a front sectional view of the module.

FIG. 10 is a plan sectional view of the module.

[Explanation of symbols]

1. Liquid crystal display unit 2 Module 8 Lamp 9 Intake port 10 Exhaust port 11 Intake duct 12 Exhaust duct 14　Blower

Claims (1)

[Claims] Claim 1. A liquid crystal display device in which a plurality of liquid crystal display units each having an intake port and an exhaust port and a lamp inside are stacked to form a module, and a plurality of these modules are arranged. , an intake duct provided in the module and communicating with each intake port of the plurality of liquid crystal display units, and a blower provided at one end of the intake duct to send air taken in from the outside into the intake tact; A liquid crystal display device characterized in that an exhaust duct is provided in the module and communicates with each exhaust port of the plurality of liquid crystal display units to exhaust the air to the outside.