JP2513364B2 - 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 display device for displaying an image by making light of a backlight incident on a liquid crystal display panel.

[0002]

2. Description of the Related Art Conventionally, as a liquid crystal display device,
There is a liquid crystal display panel in which light from a backlight is incident to display an image. In such a liquid crystal display panel, a portion to which light from a light source is exposed is very easily heated by the light, and the generated heat causes deterioration of the liquid crystal material of the liquid crystal display panel, uneven brightness of a displayed image, and the like. There is a problem that high quality images cannot be obtained due to the heating of the parts and the like. Further, in particular, the light having a very high brightness and a large amount of light is incident on the liquid crystal display panel of the liquid crystal projector in order to improve the contrast of an image to be displayed, so that the influence is more remarkable.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to prevent light from a light source from entering a portion other than the display portion of the liquid crystal display panel as much as possible to prevent an excessive liquid crystal display panel. A liquid crystal display device that suppresses heat generation, makes it difficult for the liquid crystal material of the liquid crystal display panel to deteriorate, and causes unevenness in the brightness of the displayed image, and does not heat parts around the liquid crystal display panel to obtain high quality images. To provide.

[0004]

In order to achieve the above-mentioned object, the present invention encloses a liquid crystal display panel from one side thereof with a metal case having a light transmitting window formed in a shape corresponding to the display portion of the liquid crystal display panel. At the same time, the other side of the liquid crystal display panel is covered with a heat radiating plate having a light transmitting window formed in a shape corresponding to the display portion of the liquid crystal display panel, and the metal case and the heat radiating plate are displayed in the liquid crystal display panel in the peripheral direction. To surround the panel
Outside the heat sink that covers the liquid crystal display panel
A transparent member is arranged on the side and a polarizing plate is provided on this transparent member.
It is characterized by doing so.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on the first embodiment shown in FIGS. 1 to 3 of the drawings. FIG. 1 is a front view of a liquid crystal display unit. The liquid crystal display unit 1 displays a color image on a front screen (not shown) by transmitting a light 1 of a backlight as shown in a sectional view taken along line AA of FIG. In order to do so, three transmissive liquid crystal display panels 2 for R, G, and B, which are used by being incorporated in a liquid crystal projector device and which form a color image, are arranged side by side on the entire surface of a heat dissipation plate 3 at intervals. Further, in each of the liquid crystal display panels 2 described above, a liquid crystal material 2d is sealed between the transparent glass plates 2a and 2b on both sides via a sealing material 2c, and the front surface of the transparent glass plate 2a is sealed with the sealing material 2c. A polarizing plate 2e having a size that covers the formed image display area 4 is attached.

On the other hand, the heat dissipation plate 3 is provided with each liquid crystal display panel 2
The window holes 5 corresponding to the image display areas 4 are provided respectively, and the liquid crystal display panel 2 is fixed to the heat radiating plate 3 around the window holes 5 by the adhesive 6 for sealing the cooling liquid.

The heat radiating plate 3 is provided on the light source side where the light 1 of the backlight is incident on the liquid crystal display panel 2, and for the heat radiating plate 3, the cooling unit 7 is integrated with the heat radiating plate 3. The light-transmissive panel 8 forming the above is bonded via the cooling liquid sealing adhesive 9. A polarizing plate 10 facing the polarizing plate 2e is attached to the outer surface of the translucent panel 8.

FIG. 3 is a sectional view taken along the line BB in FIG. 1, in which the cooling liquid 7a is provided with an injection port 11 at a position avoiding the image display region 4 of the liquid crystal display panel 2 in the translucent panel 8. The cooling liquid 7 a is injected into the inside 7 through the inlet 11.
Here, the cooling liquid 7a extends from the window hole 5 to the transparent glass plate 2b surface which is the back surface of each liquid crystal display panel 2 in the cooling unit 7, and each liquid crystal display panel 2 is collectively covered by the common cooling liquid 7a. It can be cooled to.

The injection port 11 is closed by an appropriate member after the cooling liquid 7a is injected. Also, the injection port 1
The position and number of 1 are not limited to those shown in the figure. Further, the heat radiating plate 3 is formed in a brim shape at the periphery thereof and is provided with a mounting hole 12 at a desired position so that the liquid crystal display portion 1 can be fixed to another appropriate frame (not shown). .

Next, a description will be given based on a second embodiment shown in FIGS. 4 to 6 of the drawings. The same members as those shown in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

In this embodiment, the holding frame 13 of the liquid crystal display panel 2 is provided on the front side of the liquid crystal display unit 1 shown in the first embodiment.
Is a case where the heat radiation plate 3 is fixedly provided. Holding frame 13
Is formed in a case shape, for example, by a metal plate,
A window hole 14 is formed at a position corresponding to the image display area 4 of each liquid crystal display panel 2. The holding frame 13 is fixed to the heat radiating plate 3 with screws 15.
The liquid crystal display panel 2 and the heat radiating plate 3 can be maintained in close contact with each other by tightening.

In the holding structure of the liquid crystal display panel 2 by the holding frame 13, the sealing material 16 interposed on the contact surface between the liquid crystal display panel 2 and the heat dissipation plate 3 is a packing for sealing instead of the adhesive 6. The liquid crystal display panel 2 is pressed against the heat dissipation plate 3 side by the pressing force of the holding frame 13, and the cooling layer 7b can be kept sealed by the flatness of the sealing material 16. In addition, in the periphery where the sealing material 16 is arranged,
A frame plate 18 provided with a frame hole 17 for positioning each sealing material 16 is provided facing the heat dissipation plate 3.
Further, the holding frame 13 and the frame plate 18 are formed so as to collectively correspond to the plurality of liquid crystal display panels 2 in this embodiment, but the holding frame 13 and the frame plate 18 correspond to each liquid crystal display panel 2. You may let it be divided.

Therefore, according to the second embodiment, the work of attaching the liquid crystal display panel 2 to the heat sink 3 becomes extremely easy. Further, the liquid crystal display unit 1 according to this embodiment can be attached to the external frame by using the screw 15.

In the first and second embodiments, the directions of the plurality of liquid crystal display panels 2 arranged in parallel on the surface of the heat dissipation plate 3 are aligned in the focal direction in correspondence with the focal length with respect to the screen. Of course, it is done.

Thus, according to each of the above-described embodiments, the cooling portion 7 for the cooling liquid 7a for cooling the plurality of liquid crystal display panels 2 is formed in series, so that the cooling liquid 7a can be injected by one injection. Since a large amount of cooling liquid 7a can be injected and the heat dissipation plate 3 can be formed with a large heat dissipation area, the heat dissipation effect of the cooling liquid 7a can be improved.

[0016]

As described in detail above, the present invention surrounds a liquid crystal display panel from one side thereof with a metal case having a light transmission window formed in a shape corresponding to the display portion of the liquid crystal display panel, and the liquid crystal The other side of the display panel is covered with a heat sink having a light transmitting window formed in a shape corresponding to the display section of the liquid crystal display panel, and the metal case and the heat sink surround the liquid crystal display panel in the circumferential direction of the liquid crystal display panel. When combined like
Both have a transparent member on the outside of the heat sink that covers the liquid crystal display panel.
And arrange a polarizing plate on this transparent member.
Therefore, the light from the light source may be emitted to areas other than the display area of the LCD panel.
Prevents incident light and prevents parts around the liquid crystal display panel from being heated,
Also, since the polarizing plate does not directly contact the liquid crystal display panel,
It suppresses excessive heat generation of the display panel and
It is difficult for the crystal material to deteriorate or the display image to have uneven brightness.
And a high quality image can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a liquid crystal display unit according to a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a front view of a liquid crystal display unit according to a second embodiment.

5 is a cross-sectional view taken along line CC of FIG.

6 is a cross-sectional view taken along line DD of FIG.

[Explanation of symbols]

 2 Liquid crystal display panel 3 Heat sink 7 Cooling part 7a Cooling liquid l Light of backlight

Claims (1)

(57) [Claims] 1. A liquid crystal display device for irradiating a liquid crystal display panel with light from a light source to display an image formed by the liquid crystal display panel, wherein the liquid crystal display panel is provided from one side thereof. The heat dissipation is achieved by enclosing the light-transmitting window in a shape corresponding to the display portion of the panel with a metal case, and forming the light-transmitting window in the shape corresponding to the display portion of the liquid crystal display panel on the other surface side of the liquid crystal display panel. A plate, and the metal case and the heat dissipation plate are combined so as to surround the liquid crystal display panel in the circumferential direction of the liquid crystal display panel.
And a transparent member on the outside of the heat dissipation plate that covers the liquid crystal display panel.
Is arranged, and a polarizing plate is provided on this transparent member.
And a liquid crystal display device.