JP2535709B2 - Liquid crystal display - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal television in which a backlight is provided on the back of a transmissive liquid crystal display, the liquid crystal layer is irradiated with light from the backlight from the back, and an image is displayed by transmitting the light. , A liquid crystal display device such as a liquid crystal projector.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal display device using a transmissive liquid crystal display such as a liquid crystal projector device, an image is displayed by transmitting light by a backlight. However, when a backlight with high brightness and high light intensity is used to improve the contrast of the image, the liquid crystal material of the liquid crystal layer is heated by the heat generated by the light source for the backlight and the infrared rays contained in the light from the light source, and The liquid crystal material is likely to be deteriorated due to the rise. Therefore, when the above-mentioned heat is applied to the liquid crystal display body, unevenness in brightness and unevenness in contrast are likely to occur in the image, and there is a problem in that a high-quality image cannot be obtained.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid crystal display device using a transmissive liquid crystal display device such as a liquid crystal projector device, in which a light source for a backlight is used. The liquid crystal material is heated by heat generation and infrared rays contained in the light of the light source, and it is possible to prevent the deterioration of the image quality due to the unevenness of the brightness and the contrast due to the deterioration of the liquid crystal material due to the temperature rise. A liquid crystal display device is provided.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the liquid crystal display device of the present invention has a display body having a liquid crystal layer containing a liquid crystal, and a refrigerant provided in close contact with the display body to display the display body. a cooling unit having a cooling layer which is Hama charge in correspondence to the region, this includes a polarizing plate arranged on the side opposite to the display body of the cooling unit, the cooling unit is in the display area of the display body It is characterized in that the portion is made of a transparent member.

[0005]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 are a perspective view and a side view showing a first embodiment of a liquid crystal display body with a cooling unit. In this case, a cooling unit 2 of a refrigerant circulation type is provided on the back surface of the liquid crystal display unit 1. It is attached integrally with the display body 1 itself.

The liquid crystal display 1 is composed of an upper polarizing plate 3, an upper glass substrate 4, a lower glass substrate 5 and a lower polarizing plate 6 arranged on the back surface (outer surface) of the cooling section 2 when viewed from the front. ,
The upper glass substrate 4 and the lower glass substrate 5 sandwich a liquid crystal layer described later.

On the other hand, the cooling unit 2 includes a cooling glass substrate 7 provided on the outer surface of the lower glass substrate 5 of the liquid crystal display 1, and FIG.
The cooling layer 8 is formed between the cooling glass substrate 7 and the lower glass substrate 5, and the cooling ports 8 are circulated and supplied with a cooling medium. There is. The circulation ports 9 and 10 are fixed to the cooling glass substrate 7 by welding or adhesion. Further, although the circulation ports 9 and 10 are provided in a diagonal direction with respect to the cooling layer 8, the positions and the numbers thereof may be other than those shown in the drawing.

In the above, the liquid crystal display 1 has a liquid crystal layer 11 containing a liquid crystal material interposed between the upper glass substrate 4 and the lower glass substrate 5 as is apparent from FIG. Are sealed with a sealing adhesive 12. Also,
The cooling layer 8 of the cooling unit 2 is also sealed with a sealing adhesive 13. As is well known, the segment terminals of the liquid crystal display 1 can be connected to the outside from the protruding end 4a of the upper glass substrate 4.

Therefore, although not shown in the figure, the cooling unit 2 having the above-described structure is provided with a cooling medium (liquid or gas) supplied from a cooling medium circulation device at the time of use.
It is filled in the cooling layer 8 through 0, and this refrigerant is circulated in the cooling layer 8 by the refrigerant circulation device.

Thus, in the liquid crystal display 1, even if the liquid crystal layer 11 reaches a state in which the temperature of the liquid crystal layer 11 is increased due to the heat generation of the light source for the backlight disposed behind the liquid crystal display 1, the liquid crystal is circulated in the cooling section 2 by the liquid crystal. It is possible to properly prevent the liquid crystal material of the layer 11 from being heated and deteriorated.

FIG. 4 shows a second embodiment. In this embodiment, in the liquid crystal display 1 including the cooling unit 2, the cooling unit 2
This is a case where the heat dissipation member 14 made of a metal mesh is built in the cooling layer 8. The heat dissipating member 14 is formed of, for example, a very thin wire rod, and the lower glass substrate 5
And the cooling glass substrate 7 are interposed. Then, as shown in FIG. 5, the edge portion has a sealing adhesive 13
It is exposed to the outside from.

In the above description, the mesh of the heat radiating member 14 is such that the image quality of the liquid crystal display 1 is not deteriorated, and the portion exposed from the sealing adhesive 13 is an appropriate external heat radiating member (not shown). Be assembled into. The cooling layer 8 in this embodiment is configured by appropriately adjusting the thickness dimension of the sealing adhesive 13 in which the heat dissipation member 14 is interposed.

Although the cooling unit 2 is attached to the liquid crystal display body 1 in the first and second embodiments, the cooling unit 2 is integrally attached to the back surface of the liquid crystal display body 1. The cooling unit 2 may be attached to the front surface of the liquid crystal display body 1 and provided integrally with the liquid crystal display body 1. Therefore, in this case, the cooling layer 8 is formed by the upper glass substrate 4 and the cooling glass substrate 7, and the upper polarizing plate 3 is located at the above-mentioned position or the cooling glass placed on the front surface. It is provided on the outer surface (front surface) of the substrate 7.

[0014]

As described above in detail, in the liquid crystal display device of the present invention, a display body having a liquid crystal layer containing a liquid crystal, and a coolant provided in close contact with the display body to display the display body. a cooling unit having a cooling layer which is Hama charge in correspondence to the region, this includes a polarizing plate arranged on the side opposite to the display body of the cooling unit, the cooling unit is in the display area of the display body Since the part is composed of a transparent member, the cooling layer and the liquid crystal display are in close contact with each other, so that the cooling layer can efficiently cool the liquid crystal display, and one of the polarizing plates that easily absorb heat can be separated from the liquid crystal display. hardly liquid crystal display body is overheated, even with combined effect hardly occurs display unevenness due to refrigerant since Hama refrigerant charge in the cooling section.

[Brief description of drawings]

FIG. 1 is a perspective view of a liquid crystal display device showing an embodiment of the present invention.

FIG. 2 is a side view of the liquid crystal display device.

FIG. 3 is a plan view of the liquid crystal display device showing a part of the liquid crystal display device.

FIG. 4 is a partially cutaway plan view of a liquid crystal display device according to another embodiment.

FIG. 5 is a perspective view of the same.

[Explanation of reference numerals] 1 liquid crystal display 2 cooling unit 8 cooling layer 9 10 circulation port 11 liquid crystal layer

Claims (1)

(57) [Claims] 1. A display element having a liquid crystal layer having a built-in liquid crystal, is provided in close contact with the display body, the cooling unit having a cooling layer which is Hama charged by the refrigerant in correspondence to the display area of the display body And a polarizing plate arranged on the side of the cooling unit opposite to the display body, wherein the cooling unit has a transparent member in a portion corresponding to the display region of the display body.