JPH08101377A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: To suppress excessive heat generation, to hardly obviate the generation of unequal brightness and to obtain images having good quality by covering the front and rear surfaces of liquid crystal panels with members formed with light transparent windows, coupling these panels so as to enclose a display panel, arranging transparent members on a light incident side and providing the panels with a polarizing plates. CONSTITUTION: The transmission type liquid crystal display panels 2 are intermittently juxtaposed on a heat radiation plate 3. The liquid crystal display panels 2 are formed by sealing liquid crystal materials 2d between transparent glass plates 2a and 2b of both surfaces and mounting the polarizing plates 2e on the front surfaces of the optical glass plates 2a. The heat radiating plates 3 are provided with window holes 5 corresponding to the image display regions of the respective liquid crystal display panels 2. The liquid crystal display panels 2 are fixed to the heat radiating plates 3 by adhesives 6 on the circumference of the window holes 5. The heat radiating plates 3 are formed on the light source side of the light 1 of a back light with respect to the liquid crystal display panels 2 and translucent panels 8 are adhered by adhesives 9 to the heat radiating plates 3. Polarizing plates 10 facing the polarizing plates 2e are mounted at the outside surfaces of the translucent panels 8.

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 which illuminates a liquid crystal display panel with light from a backlight to display an image.

[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. Such devices include a device of the type that directly looks at the display image on the liquid crystal display panel and a device of the type that projects the display image of the liquid crystal display panel onto a screen or the like for observation.

[0003]

In such a liquid crystal display panel, a portion irradiated with light from the light source is very likely to generate heat, and the heat generation causes deterioration of the liquid crystal material of the liquid crystal display panel or display. There is a problem in that a high-quality image cannot be obtained due to uneven brightness in the image or heat of surrounding parts. In addition, in order to improve the contrast of the image displayed on the liquid crystal display panel of the liquid crystal projector, which is a method of observing the image displayed on the liquid crystal display panel by projecting it on a screen or the like, light of extremely high brightness and high light quantity is incident. Therefore, the effect was more remarkable.

[0004]

According to the invention of claim 1, the front and back surfaces of the liquid crystal display panel are covered with two members each having a light transmission window formed in a shape corresponding to the display portion of the liquid crystal display panel. , The two members are combined so as to surround the liquid crystal display panel in the peripheral direction of the liquid crystal display panel, and further, a transparent member is arranged on the light incident side of the liquid crystal display panel so as not to be in direct contact with the liquid crystal display panel, Since a polarizing plate is provided on this transparent member, the light from the light source can be prevented from entering the parts other than the display part of the liquid crystal display panel and the parts around the liquid crystal display panel are not heated, and the polarizing plate is directly attached to the liquid crystal display panel. Since they do not come into contact with each other, excessive heat generation of the liquid crystal display panel is suppressed, deterioration of the liquid crystal material of the liquid crystal display panel and unevenness of brightness in the displayed image are less likely to occur, and a high-quality image can be obtained.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 the liquid crystal display unit, which is shown in FIG.
In order to display a color image on the front screen (not shown) by transmitting the light 1 of the backlight as shown in the sectional view, it is used by being incorporated in the liquid crystal projector device and constituting the color image. Three transmissive liquid crystal display panels 2 for use are arranged side by side on the entire surface of the heat sink 3. 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 has a brim-shaped periphery and mounting holes 12 are provided at desired positions.
The liquid crystal display unit 1 can be fixed to another suitable frame (not shown).

Next, a description will be given based on the 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 a duplicate description will be omitted.

In this embodiment, the holding frame 13 of the liquid crystal display panel 2 is fixed to the heat radiating plate 3 on the front side of the liquid crystal display unit 1 shown in the first embodiment.

The holding frame 13 is formed of a metal plate or the like in a case shape, and 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 by a screw 15, and by tightening the screw 15, the close contact between the liquid crystal display panel 2 and the heat radiating plate 3 can be maintained durable.

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 sink 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 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, although the holding frame 13 and the frame plate 18 are formed so as to correspond to a plurality of liquid crystal display panels 2 in this embodiment, the holding frame 13 and the frame plate 18 are formed for each liquid crystal display panel 2. It may be divided correspondingly.

According to the second embodiment, however, 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 outer frame using screws 15.

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

Thus, according to the above-described embodiments,
Since the cooling unit 7 for cooling the liquid 7a for cooling the plurality of liquid crystal display panels 2 is formed in series, the injection of the cooling liquid 7a is 1
It is sufficient to inject a large amount of cooling liquid 7a in a single injection, and
Since the heat dissipation plate 3 can also be formed with a large heat dissipation area, the cooling liquid 7a
The heat radiation effect of can be improved.

[0019]

According to the invention of claim 1, the front and back surfaces of the liquid crystal display panel are covered with two members each having a light transmitting window formed in a shape corresponding to the display portion of the liquid crystal display panel. The members of are joined so as to surround the liquid crystal display panel in the peripheral direction of the liquid crystal display panel, and a transparent member is arranged on the light incident side of the liquid crystal display panel so as not to be in direct contact with the liquid crystal display panel. Since the polarizing plate is provided, it is possible to prevent light from the light source from entering the portions other than the display portion of the liquid crystal display panel, the parts around the liquid crystal display panel are not heated, and the polarizing plate does not directly contact the liquid crystal display panel. Excessive heat generation of the liquid crystal display panel is suppressed, deterioration of the liquid crystal material of the liquid crystal display panel and unevenness of brightness in the displayed image are less likely to occur, 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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G09F 9/30 307 7426-5H H04N 5/66 102 A

Claims (1)

[Claims] 1. A liquid crystal display device for illuminating 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 has a front surface and a back surface, respectively. The liquid crystal display panel is covered with two members each having a light transmission window formed in a shape corresponding to the display unit, and the two members are combined so as to surround the liquid crystal display panel in the circumferential direction of the liquid crystal display panel. A liquid crystal display device, wherein a transparent member is arranged on the light incident side of the display panel so as not to be in direct contact with the liquid crystal display panel, and a polarizing plate is provided on the transparent member.