JPH03211585A - On vehicle display device - Google Patents

Abstract

PURPOSE:To provide the above display device which withstands use in severe environment by providing a blasting means which discharges gas from the other through suction/discharge passages and a partition wall which separates the gas sucked and discharged from 1st outdoor suction/discharge holes and the gas sucked and discharged from 2nd outdoor suction/discharge holes. CONSTITUTION:A case 2 has the suction/discharge holes 4 in the side parts and bottom part and is mounted with a dust removing filter 21 which removes the dust in the outdoor air to be sucked. The partition wall 24 to cover the case 2 is provided on the outer side thereof. A dust removing filter 20 which removes the dust in the outdoor air to be sucked is mounted on the outer side of the suction/discharge holes 3 of the partition wall 24. The outdoor air discharged from the outdoor suction/discharge holes 3 on one side and the outdoor air sucked from the outdoor suction/discharge holes 4 on the other are partitioned by the bottom part of the partition wall 24 and, therefore, the mingling of the discharged air with he sucked outdoor air is obviated and the heating and cooling of the good efficiency are possible. The on vehicles display device which withstands the use in the severe environment is obtd. in this way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an in-vehicle display device used as an in-vehicle television, etc., and in particular, to an in-vehicle display device used as an in-vehicle television, etc. Cooling in liquid crystal display devices that are mounted in an integrated manner.

The present invention relates to an on-vehicle display device equipped with an intake/exhaust mechanism for heating.

[Conventional technology]

A vehicle-mounted television using a liquid crystal display element is described in, for example, Japanese Utility Model Application No. 63-31080.

The response time of liquid crystal display elements becomes extremely slow at low temperatures.
Also, it doesn't just stop working at high frequencies.

There is a drawback that the liquid crystal display element itself deteriorates.

Therefore, in order to use a liquid crystal display element as a vehicle-mounted display device, it must be able to withstand the harsh environment unique to vehicles.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not deal with the adverse environments unique to vehicles, such as low temperatures, high-pitched sounds, temperature changes, etc. ! There was a problem in that there was insufficient consideration for use in harsh environments such as dust, and when used at low or high temperatures, the screen became difficult to see or could not be seen at all.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide an on-vehicle display device that can withstand use under harsh environments.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a vehicle display device using a liquid crystal display element, in which first and second outside air intake/exhaust holes are not adjacent to each other, and air is sucked from the second outside air intake/exhaust hole. A heating means for heating outside air, a first outside air intake/exhaust hole, an intake/exhaust passage connecting in series the surface area of the liquid crystal display element, the heating means, and a second outside air intake/exhaust hole, and first and second outside air intake/exhaust holes. a blowing means that sucks outside air from one of the air holes and exhausts it from the other through the air intake and exhaust passage; gas that is sucked in and exhausted from the first outside air intake and exhaust hole; and gas that is sucked and exhausted from the second outside air intake and exhaust hole; It is characterized by having a partition wall that separates the

[Effect]

According to the above configuration, when the environmental temperature of the liquid crystal display element is high, the heating means is turned off, outside air is sucked through the first outside air intake/exhaust hole, and this outside air is supplied to the surface area of the liquid crystal display element. Cool the liquid crystal display element. The outside air that has cooled the liquid crystal display element is exhausted from the second outside air intake/exhaust hole through the heating means in the OFF state.

On the other hand, when the environmental temperature of the liquid crystal display element is low, the heating means is turned on to draw outside air through the second outside air intake/exhaust hole, and after heating the outside air with the heating means, it is supplied to the surface area of the liquid crystal display element. to heat the liquid crystal display element. The outside air that has heated the liquid crystal display element is exhausted from the first outside air intake/exhaust hole.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

FIG. 1 is a perspective view of an in-vehicle liquid crystal display device according to an embodiment of the present invention, and in particular, in the same figure, a portion thereof is shown transparently so that its structure is clear. Also, the second
The figure is a sectional view taken along the line a-b of FIG. 1, and the same parts are given the same reference numerals.

In the second time, the backlight 6 is composed of a U-shaped tube 10 which is a light emitting body, a reflection plate 11 and a diffusion plate 12. In addition, the lighting of the U-shaped tube 10 is controlled by the inverter 18 (first
Figure).

The heat sink 9 includes a heat absorbing/radiating plate 30 , a heating element 7 fixed to an L-shaped bent portion below the heat absorbing/radiating plate 30 , and a heat generating element 7 fixed to an L-shaped bent portion below the heat absorbing/radiating plate 30 . A heat radiation fan 8 is installed around the opening 16 in the center of the heat absorption and radiation plate 30.
is provided.

The wind direction changing plate 31 has a tapered portion 32 in a portion facing the opening 15 of the heat absorbing and dissipating plate 30, as shown in the figure.

The backlight 6 is fixed to the frame 1 together with the liquid crystal panel 5 via the heat sink 9, and the light from the backlight 6 is irradiated onto the back surface of the liquid crystal panel 5 through the opening 16 of the heat absorption/dissipation plate 30. Ru. A filter 17 (FIG. 2) is provided on the image plane of the liquid crystal panel 5, and the filter 17 is fixed by a frame l.

On the other hand, an axial fan 23 and a control panel 19 including a display control circuit are attached to the case 2. Further, the case 2 has intake and exhaust holes 4 on the side and bottom portions, and a dust removal filter 21 is attached to the outside of the intake and exhaust holes 4 to remove dust from the outside air to be sucked.

A partition wall 24 is provided on the outside of the case 2 so as to cover it, and a dust removal filter 2o is attached to the outside of the intake/exhaust hole 3 of the partition wall 24 to remove dust from the outside air to be sucked. Note that the circular portion of the partition wall 24 facing the axial fan 23 is a recessed portion, and no intake/exhaust holes are formed in the circular portion.

In the in-vehicle liquid crystal display device having such a configuration, when the temperature of the liquid crystal panel 5 is high and it is necessary to cool it, the axial fan 23 operates in the forward direction, and the outside air is passed through the filter 20.
The air is sucked through the intake/exhaust hole 3 , is pressurized by the case 2 , and then is blown into the heat sink 9 through the air blowing opening 15 .

In this embodiment, the partition wall 24 has a large number of intake/exhaust holes 3, and the outside air is sucked in in a dispersed manner, so that the filter 20 has a high dust collection efficiency and also has a low pressure loss.

Furthermore, in this embodiment, since the direction of the sucked outside air is changed by the tapered portion 32 of the wind direction changing plate 31, the sucked outside air can be efficiently blown into the heat sink 9.

The air blown into the heat sink 9 cools the liquid crystal panel 5 and then escapes to the outside of the heat sink 9 between the radiation fins 8, and then passes through the intake/exhaust holes 4 and the filter 21 and is exhausted to the outside of the device.

On the other hand, when the temperature of the liquid crystal panel 5 is low and it is necessary to heat it, the axial flow fan 23 is operated in reverse so that the outside air flows in the opposite direction to that during cooling, and the heating element 7 is energized.

The outside air sucked in from outside the device through the filter 21 and the intake/exhaust hole 4 is blown into the heat sink 9.

Therefore, it is heated by passing between the heat dissipation fans 8 heated by the heating element 7.

The heated outside air reaches the back surface of the liquid crystal panel 5, heats the liquid crystal panel 5, and then passes through the ventilation opening 15, the axial fan 23. Intake and exhaust holes 3. It passes through the filter 20 and is exhausted to the outside of the device.

According to this embodiment, the flow of outside air during cooling and heating is completely reversed, the two outside air intake and exhaust holes are not close to each other, and the outside air exhausted from one outside air intake and exhaust hole is mixed with the outside air exhausted from the other outside air intake and exhaust hole. Since the outside air sucked through the pores is partitioned off by the bottom of the partition wall 24, the exhausted air does not mix with the sucked outside air, allowing efficient heating and cooling.

Further, in this embodiment, since the case, the heat sink 9, etc. constitute the intake and exhaust passages, it is possible to provide an in-vehicle display device that can withstand use under harsh environments without significantly increasing the number of parts.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the outside air exhausted from one outside air intake/exhaust hole and the outside air sucked from the other outside air intake/exhaust hole do not mix, resulting in efficient heating and cooling. becomes possible.

Further, since the necessary members such as the case for configuring the display device constitute the intake and exhaust passages, the number of parts does not increase significantly.

Furthermore, by providing dust removal filters in the two outside air intake and exhaust holes, dust in the outside air sucked into the device is removed, thereby preventing contamination, functional deterioration, etc. due to dust.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a vehicle-mounted liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a sectional view of the vehicle-mounted liquid crystal display device of FIG. 1 viewed from the direction of arrow A. 1... Frame, 2... Case, 3...
...first intake/exhaust hole, 4...intake/exhaust hole, 5...
LCD panel, 6... Backlight, 7...
・Heating element, 8...Radiation fin, 9...
- Heat sink, 10... light emitter. 11...Reflector plate, 12...Diffusion plate, 1
5...Blower opening, 16...Opening, 18
...Inverter. 19... Display control panel, 20.21... Filter, 23... Axial flow fan, 2
4... Partition wall, 30... Heat absorbing/dissipating plate, 3
1... Wind direction change board. Hanging 1 Takume

Claims (2)

[Claims] (1) In a vehicle-mounted display device using a liquid crystal display device, first and second outside air intake/exhaust holes that are not close to each other, a heating means for heating the outside air sucked from the second outside air intake/exhaust hole, and the first outside air intake/exhaust hole. an intake/exhaust passage that connects the first outside air intake/exhaust hole in series, the rear surface area of the liquid crystal display element, the heating means, and the second outside air intake/exhaust hole; a blowing means for sucking air in and exhausting it from the other outside air intake/exhaust hole through the intake/exhaust passage; and a partition wall that separates the gas taken in and exhausted from the first outside air intake/exhaust hole and the gas taken in and exhausted from the second outside air intake/exhaust hole. An in-vehicle display device comprising: (2) The vehicle-mounted display device according to claim 1, further comprising a dust removal filter in the first outside air intake/exhaust hole and the second outside air intake/exhaust hole.