KR20060001237A - Liquid crystal display device - Google Patents

Abstract

The present invention discloses a liquid crystal display device capable of preventing light leakage defects even when warpage occurs in the liquid crystal panel due to heat. Disclosed is a liquid crystal display device including a liquid crystal panel, a support frame, an optical sheet, a diffusion plate, lamps, a lower cover, and an upper case, wherein the liquid crystal panel and the upper case are wrapped around an edge of the liquid crystal panel. Located between the liquid crystal panel and the support frame, a buffer jack for cushioning the occurrence of warpage of the liquid crystal panel is attached.

Here, the buffer jack is prepared by injecting a viscous fluid in the synthetic resin bag, the fluid used in the buffer jack is any one of air (air), silicone, synthetic resin, the buffer jack is the liquid crystal panel It is characterized in that attached to the corner area of the.

LCD, gap, buffer, upper case, liquid crystal panel

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is a plan view showing a liquid crystal display device having a buffer tape according to the prior art.

FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 1.

3 is a view for explaining a light leakage failure between the liquid crystal panel and the upper case according to the prior art.

4 is a plan view showing a liquid crystal display device with a buffer jack according to the present invention.

FIG. 5 is a cross-sectional view taken along the line BB ′ in FIG. 4; FIG.

Figure 6 is a view for preventing the leakage of light leakage between the liquid crystal panel and the upper case by a buffer jack according to the present invention.

7 is a view showing a structure of a buffer jack according to the present invention.

8 is a view for explaining another embodiment according to the present invention.

* Description of the symbols for the main parts of the drawings *

111: liquid crystal panel 115: optical sheet

117: diffusion plate 119: lamp

121: support frame 125: buffer jack (JACK)

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of preventing light leakage defects even when warpage occurs in the liquid crystal panel due to heat.

Recently, due to the rapid development of semiconductor technology, liquid crystal display devices are becoming smaller and lighter, and more powerful products are being produced. Cathode ray tube (CRT), which is widely used in information display devices, has many advantages in terms of performance and price, but has many disadvantages in terms of miniaturization or portability.

On the other hand, liquid crystal displays have been attracting attention as an alternative means of overcoming the shortcomings of CRT due to the advantages of miniaturization, light weight, and low power consumption, and are now used in almost all information processing devices that require display devices. It is the situation that is attached.

Such liquid crystal displays generally apply voltages to specific molecular arrays of liquid crystals to convert them into other molecular arrays, and change optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of liquid crystal cells that emit light by such molecular arrays. Is a display device using modulation of light by a liquid crystal cell by converting the light into a visual change.

In general, a backlight used as a light source of a liquid crystal display device is a method of disposing a cylindrical light emitting lamp, and is divided into an edge method and a direct method.                         

In the double edge method, a lamp unit is installed on the side of the light guide plate for guiding light, and the lamp unit surrounds a lamp emitting light, a lamp holder inserted into both ends of the lamp to protect the lamp, and an outer circumferential surface of the lamp. One side is provided on the side of the light guide plate has a lamp reflector for reflecting the light emitted from the lamp toward the light guide plate.

As such, the edge method in which the lamp unit is installed on the side of the light guide plate is mainly applied to a relatively small liquid crystal display device such as a monitor of a laptop computer and a desktop computer. It is advantageous to thin the liquid crystal display device.

On the other hand, the direct type method has been developed mainly as the size of the liquid crystal display device has increased to 20 inches or more, and a plurality of lamps are arranged in a row on the lower surface of the diffuser plate to direct light directly to the front of the LCD panel. will be.

The direct method is mainly used for a large screen liquid crystal display device requiring high luminance because the light utilization efficiency is higher than that of the edge method.

1 is a plan view illustrating a liquid crystal display device having a buffer tape according to the related art.

As shown in FIG. 1, the liquid crystal panel 11 and the top case 10 are assembled.

In the case of a direct type liquid crystal display device, the liquid crystal panel 11 is fixed by a support frame 21 and laminated on a lower cover, and the upper case 10 and the liquid crystal panel 11 assembled with the lower cover. ), The buffer tape 25 is attached.                         

Therefore, the upper case 10 and the liquid crystal panel 11 are fixed to each other by the buffer tape 25 so that the liquid crystal panel 11 and the upper case 10 are warped even if the liquid crystal panel 11 is bent by heat. A predetermined interval is maintained between the axles.

FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 1.

As shown in FIG. 2, the liquid crystal panel 11 is stacked on the lower cover 20 with both sides fixed by the support frame 21.

A plurality of optical sheets 15 and a diffusion plate 17 are stacked between the liquid crystal panel 11 and the lower cover 20.

A plurality of lamps 19 are disposed at predetermined intervals between the diffusion plate 17 and the inner surface of the lower cover 20.

When the liquid crystal panel 11, the optical sheet 15, the diffusion plate 17, and the lamps 19 are assembled inside the lower cover 20, the upper case 10 covering the entire lower cover 20 may be formed. Is fastened.

In this case, a buffer tape 25 is attached between the inside of the upper case 10 and the liquid crystal panel 11 to prevent the liquid crystal panel 11 from flowing.

In addition, a fixing portion 25a is disposed between the liquid crystal panel 11 and the support frame 21 to prevent the liquid crystal panel 11 from flowing. In general, a high friction force, such as rubber, and a good buffering force are provided. Use materials.

However, in the liquid crystal display device as described above, the buffer tape is disposed between the upper case and the liquid crystal panel to prevent the liquid crystal panel from flowing.

3 is a view for explaining a light leakage failure between the liquid crystal panel and the upper case according to the prior art.

As shown in FIG. 3, when warpage occurs in the liquid crystal panel 11 placed between the upper case 10 and the support frame 21, the buffer tape 25 may be formed of the liquid crystal panel 11 and the upper case ( 10) it can be seen that the cell gap is not prevented from causing light leakage in between.

That is, the buffer tape 25 is attached to the liquid crystal panel 11 and the upper case 10 in the form of a double-sided tape to prevent the liquid crystal panel 11 from flowing, and to cause bending of the liquid crystal panel 11. It does not prevent the light leakage caused by.

In particular, in the IPS mode, the cell gap defect between the liquid crystal panel 11 and the upper case 10 causes a lot of light leakage and degrades the image quality.

According to the present invention, by attaching a jack containing air or a buffer material between the corner region of the liquid crystal panel, that is, the upper case and the support frame, the cell gap between the upper case and the liquid crystal panel is kept constant when the liquid crystal panel has a bad bending. It is an object of the present invention to provide a liquid crystal display device capable of preventing light leakage.

In order to achieve the above object, the liquid crystal display device according to the present invention,

A liquid crystal display device comprising a liquid crystal panel, a support frame, an optical sheet, a diffusion plate, lamps, a lower cover, and an upper case,

The buffer jack is positioned between the liquid crystal panel and the upper case, the liquid crystal panel, and the support frame while surrounding the edge of the liquid crystal panel to cushion the occurrence of warpage of the liquid crystal panel.

Here, the buffer jack is prepared by injecting a viscous fluid in the synthetic resin bag, the fluid used in the buffer jack is any one of air (air), silicone, synthetic resin, the buffer jack is the liquid crystal panel It is characterized in that attached to the corner area of the.

The buffer jack is attached along a circumference of the liquid crystal panel, and the buffer jack maintains a constant cell gap between the liquid crystal panel and the upper case.

According to the present invention, by attaching a jack containing air or a buffer material between the corner region of the liquid crystal panel, that is, between the upper case and the support frame, the cell gap between the upper case and the liquid crystal panel is uniformly maintained when the liquid crystal panel is warped. To prevent light leakage.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a plan view showing a liquid crystal display device with a buffer jack according to the present invention.

As shown in FIG. 4, the liquid crystal panel 111 is fixed to the support frame 121, and an upper case 100 is assembled along the circumference of the liquid crystal panel 111.

In addition, a buffer jack 125 is provided in the corner region of the liquid crystal panel 111 to mitigate the bending of the liquid crystal panel 111.

The buffer jack 125 puts an air or viscous fluid in a bag made of a synthetic resin, and relieves bending or stress in the corner region of the liquid crystal panel 100 so as to relieve it from the upper case 100. It was possible to maintain a uniform cell gap.

Since the buffer jack 125 used in the present invention uses air or a viscous fluid material (for example, silicone and synthetic resin), the liquid crystal panel 111 and the support frame 121 and the upper case 100 are separated from each other. While maintaining a constant cell gap, it serves to prevent the flow of the liquid crystal panel 111.

5 is a cross-sectional view taken along the line BB ′ of FIG. 4.

As shown in FIG. 5, the liquid crystal panel 111 is stacked on the lower cover 120 with both sides fixed by the support frame 121, and the liquid crystal panel 111 and the lower cover 120 are fixed to each other. The plurality of optical sheets 115 and the diffusion plate 117 are stacked therebetween.

A plurality of lamps 119 are disposed at predetermined intervals between the diffusion plate 117 and the inner surface of the lower cover 120.

When the liquid crystal panel 111, the optical sheet 115, the diffusion plate 117, and the lamps 119 are assembled inside the lower cover 120, the upper case 100 covering the entire lower cover 120. Is fastened.

In this case, by attaching a buffer jack (JACK) 125 to each corner of the liquid crystal panel 111, the liquid crystal panel 111 may maintain a uniform gap with the upper case 100 and the support frame 121. It was.

In particular, when the shock absorbing jack 125 is placed between the liquid crystal panel 111, the support frame 121, and the upper case 100 and warpage occurs in the liquid crystal panel 111, the buffer jack 125 may be replaced with a sieve. Viscosities such as warmed air, silicon, and synthetic resins minimize the stress acting on the liquid crystal panel 111 by moving the flow material.

 Therefore, even when stress such as bending occurs in the liquid crystal panel 111, the force that causes the bending by the buffer jack 125 is alleviated, or a cell gap between the liquid crystal panel 111 and the upper case 100. Was kept constant to prevent light leakage defects.

6 is a view for explaining the prevention of light leakage failure between the liquid crystal panel and the upper case by the buffer jack according to the present invention.

As shown in FIG. 6, when warpage occurs in the liquid crystal panel 111 disposed between the upper case 100 and the support frame 121, the liquid crystal panel 111 and the upper case are formed by the buffer jack 125. It can be seen that the cell gap of the 100 or the support frame 121 is constant.

Therefore, when the buffer jack 125 of the present invention is used, even if bending or stress is applied to the liquid crystal panel 111, the force or stress applied to the liquid crystal panel 111 is reduced while maintaining a constant cell gap. The light leakage can be prevented.

7 is a view showing the structure of a buffer jack according to the present invention.

As illustrated in FIG. 7, since the buffer jack 125 attached to the corner region receiving the most stress or force in the liquid crystal panel is manufactured by injecting air, flowable silicone, or flowable synthetic resin into a bag made of synthetic resin, It can alleviate external forces.

When the buffer jack 125 is attached only to the corner region of the liquid crystal panel, the support part 126 fixing the buffer jack 125 to both sides is provided.

The support part 126 is about one side edge length of the liquid crystal panel. When the buffer jack 125 is attached to the corner of the liquid crystal panel, the support part 126 is fixedly supported so that the buffer jack 125 does not move. It will play a role.

8 is a view for explaining another embodiment according to the present invention.

As shown in FIG. 8, the liquid crystal panel 111 is fixed to the support frame 121, and a buffer jack 125 is attached along the entire circumference of the liquid crystal panel 111.

Therefore, the buffer jack 125 is attached to the upper case 100 along the circumferential region of the liquid crystal panel 111.

In FIG. 5, the shock absorbing jack 125 is attached to the liquid crystal panel only in the corner region where warpage is likely to occur or the stress is greatest. Here, the shock absorbing jack 125 is attached along the entire circumference of the liquid crystal panel 111.

Therefore, even if the bending or the stress in any region of the liquid crystal panel 111, the cell gap between the upper case 100 and the liquid crystal panel 111 can be kept constant to prevent light leakage defects.

As described in detail above, the present invention attaches a jack containing air or a buffer material between the corner region of the liquid crystal panel, that is, the upper case and the support frame, so that when the bending failure of the liquid crystal panel occurs, By maintaining a constant cell gap of the light leakage is effective to prevent.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

Claims (6)

A liquid crystal display device comprising a liquid crystal panel, a support frame, an optical sheet, a diffusion plate, lamps, a lower cover, and an upper case, A buffer jack positioned between the liquid crystal panel and the upper case and between the liquid crystal panel and the support frame while surrounding the edge of the liquid crystal panel to cushion the occurrence of warpage of the liquid crystal panel. Device. The method of claim 1, And the buffer jack is manufactured by injecting a viscous fluid into the synthetic resin bag. The method of claim 2, Liquid material used in the buffer jack is any one of air (air), silicon, synthetic resin. The method of claim 1, And the buffer jack is attached to an edge region of the liquid crystal panel. The method of claim 1, And the buffer jack is attached along an edge circumference of the liquid crystal panel. The method of claim 1, And the buffer jack keeps the cell gap between the liquid crystal panel and the upper case constant.

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