KR101649219B1 - Liquid crystal display device - Google Patents

Abstract

One embodiment of the present invention is to provide a liquid crystal display device in which a pad portion for bonding a support main and a liquid crystal display panel includes a protrusion of an embossed shape.

Therefore, in the liquid crystal display device, the force to be squeezed to one side, which is the cause of the pressurized light leakage, can be balanced to balance the force, the defect rate due to the light leakage can be improved, To prevent breakage. In addition, the quality of the liquid crystal display device is improved by preventing the light leakage and improving the defective ratio as described above.

Pressed property, light leakage, liquid crystal display device.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device provided with protrusions capable of preventing light leakage generated in a support main body and a pad portion of a liquid crystal display panel.

BACKGROUND ART A display device used for a computer monitor or a TV includes an organic light emitting display (OLED) that emits light by itself, a vacuum type fluorescent display (VFD), an electroluminescent display A field emission display (FED), a plasma display panel (PDP), and a liquid crystal display (LCD) that does not emit light by itself and requires a light source.

A general liquid crystal display device includes two substrates provided with electric field generating electrodes and a liquid crystal layer interposed therebetween and having a dielectric anisotropy. A voltage is applied to the field generating electrode to generate an electric field in the liquid crystal layer and the intensity of the electric field is controlled by changing the voltage to adjust the transmittance of light passing through the liquid crystal layer to display a desired image.

Liquid crystal display devices are widely used in various fields such as notebook PC and monitor market due to advantages such as small size, light weight and low power consumption.

Since such a liquid crystal display device can not emit light by itself, a separate light source such as a backlight is required. Accordingly, the liquid crystal display device includes a liquid crystal panel and a backlight unit. The backlight unit provides light to the liquid crystal panel, and the light is transmitted through the liquid crystal panel. At this time, the liquid crystal panel displays an image by adjusting the transmittance of the light.

The backlight unit is classified into an edge type and a direct type according to the arrangement of the light sources. In the edge type, the light source is disposed on the side surface of the liquid crystal panel. Further, the light guide plate is disposed on the back surface of the liquid crystal panel, and guides the light provided on the side surface of the liquid crystal panel to the back surface of the liquid crystal panel. Alternatively, the direct type may include a plurality of light sources on the back surface of the liquid crystal panel, and the light emitted from the plurality of light sources may be directly provided to the back surface of the liquid crystal panel.

As the light source, EL (Electro Luminescence), Cold Cathode Fluorescent Lamp (CCFL), Hot Cathode Fluorescent Lamp (HCFL), and LED are used. Among these, the light emitting diode (LED) has advantages of low power consumption and excellent luminous efficiency.

The liquid crystal driving method of the liquid crystal display device is classified into TN, VA (vertical alignment) and IPS (in-plane swithching). Among them, the TN method basically obtains the contrast ratio depending on the passage of light depending on the arrangement state of the liquid crystal, there is a color conversion according to the viewing angle, and there is a problem that afterimage remains in a fast moving image. VA is a method of aligning liquid crystal molecules in a vertical direction and then adding a film that can correct the viewing angle. In the IPS method, there is no need to set up liquid crystal molecules inside the LCD panel, You can see a clean screen. In addition, the IPS system is characterized in that the viewing angle is good and the response speed is fast based on the principle that liquid crystal molecules are horizontally driven.

However, in the conventional in-plane switching (IPS) type liquid crystal display device, the power mains are not balanced due to the step difference and the tolerance in the support main part of the backlight unit part, so that light leakage occurs. That is, since the force applied to the pad portion of the support main is tilted to one side and the force is not balanced, a compressive light leakage of IPS occurs.

Embodiments of the present invention provide a liquid crystal display device capable of preventing a pushing light leakage phenomenon occurring in an IPS-mode liquid crystal display device.

A liquid crystal display device according to one embodiment includes a liquid crystal display panel; A light guide plate disposed on a rear surface of the liquid crystal display panel; A support main body surrounding the light guide plate and housing the liquid crystal display panel; And a pad portion for bonding the support main and the liquid crystal display panel, wherein the pad portion includes a body and a protruding portion.

The pad portion of the liquid crystal display device is characterized in that the projecting portions are formed such that hemispherical embossed shapes are adjacent to each other or are spaced apart at regular intervals.

In the liquid crystal display device according to one embodiment, the pad portion for adhering the support main and the liquid crystal display panel includes an embossed protrusion.

Therefore, in the liquid crystal display device, the force balance can be adjusted by totally dispersing the force of leaning to one side which is the cause of the pushable light leakage.

In addition, it is possible to improve the defect rate due to the light leakage, and to prevent the breakage of the glass caused by the unbalance of the force. The quality of the liquid crystal display device can be improved by preventing the light leakage and improving the defective ratio as described above.

In the description of the embodiments, it is described that each panel, body, part, sheet or plate is formed "on" or "under" of each panel, body, part, sheet or plate, In this case, "on" and "under " all include being formed either directly or indirectly through another element.

In addition, the criteria for the top, side, or bottom of each component are described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

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

1 is an exploded perspective view illustrating a liquid crystal display device according to one embodiment. FIG. 2 is a rear view and a pad of a liquid crystal display device according to an exemplary embodiment of the present invention. 3 is a cross-sectional view of the liquid crystal display device taken along line I-I 'in FIG. 4 is a cross-sectional view of the liquid crystal display device taken along the line II-II 'in FIG. 5 is a cross-sectional view illustrating a support main body and a liquid crystal display panel bonded together by a pad portion of a liquid crystal display device according to an embodiment.

1, a liquid crystal display device according to an exemplary embodiment includes a liquid crystal display panel 100 on which an image is displayed, and a backlight unit 300 disposed below the liquid crystal display panel 100 to provide light .

Although not shown in detail, the liquid crystal display panel 100 includes a thin film transistor (TFT) substrate, a color filter substrate, and a color filter substrate disposed on the thin film transistor substrate so as to face each other and maintain a uniform cell gap. And a liquid crystal layer interposed between the substrates.

The thin film transistor substrate includes a plurality of gate lines, a plurality of data lines intersecting the plurality of gate lines, and a thin film transistor (TFT) formed at an intersection of the gate lines and the data lines. The color filter substrate disposed on the thin film transistor substrate is a substrate on which R, G, and B color filters are formed by a thin film process, Electrode is deposited.

In addition, an integrated circuit chip (IC CHIP) is formed on one end of the thin film transistor substrate. The integrated circuit chip generates an image signal for driving the liquid crystal display device, a scan signal and a plurality of timing signals for applying these signals, and supplies the image signal and the scan signal to the gate line and the data line of the liquid crystal display panel 100, .

The backlight unit 300 is disposed on the back surface of the liquid crystal display panel 100 to provide light. The backlight unit 300 includes a light source 510, a light source housing 520 surrounding the light source 510, a light guide plate 400 disposed in parallel with the light source 510, a light guide plate 400 disposed on a lower surface of the light guide plate 400 A bottom cover 700 on which the reflective sheet 600 is mounted and a support main 200 surrounding the liquid crystal display panel 100 to surround the light guide plate 400 .

In addition, the backlight unit 300 includes optical sheets 310, 320, and 330 disposed on the light guide plate 400 to diffuse and condense light.

The light source 510 is disposed side by side with the light guide plate 400. A cold cathode fluorescent lamp (CCFL) equipped with electrodes at both ends of a glass tube, and an external electrode fluorescent lamp (EEFL) having a structure to surround both ends of a glass tube.

The lamp may be disposed on both sides of the light guide plate 400. The light source 510 may be disposed on the opposite side of the light guide plate 400. The light source 510 may be disposed on one side of the light guide plate 400, A diode (LED) can be used.

The light source housing 520 increases the efficiency of light emitted from the light source 510 and prevents loss of light. In addition, the light source housing 520 protects the light source 510.

The light guide plate 400 is disposed side by side with the light source 510. The light guide plate 400 is accommodated in the support main body 200 and the bottom cover 700. The support main body 200 may have grooves (not shown) for accommodating the light guide plate 400. In addition, the bottom cover 700 may have grooves (not shown) for accommodating the light guide plate 400. Since the light guide plate 400 is supported by the support main body 200 and the bottom cover 700 having such a groove structure, the flow of the light guide plate 400 can be prevented.

The light guide plate 400 may be made of PMMA (polymethyl methacrylate). A prism pattern may be formed on the back surface of the light guide plate 400 to refract the incident light toward the optical sheets 310, 320, and 330.

The light guide plate 400 serves to convert the forward light or the glow light into the light plane, and guides the light incident from the light source 510 toward the liquid crystal display panel 100.

The reflective sheet 600 is disposed on the lower surface of the light guide plate 400. The reflective sheet 600 reflects light emitted to the backside of the light guide plate 400 and the optical sheets 310, 320, and 330 when the light incident on the light guide plate 400 is emitted to the back side of the light guide plate 400. [ Direction. The reflective sheet 600 may be made of a material such as PET having high reflectance.

The optical sheets 310, 320 and 330 include a diffusion sheet 310 for diffusing light, a light collecting sheet 320 for condensing light, and a protective sheet 330 for protecting the light collecting sheet 320. The diffusion sheet 310, the light condensing sheet 320, and the protective sheet 330 are sequentially disposed on the light guide plate 400.

The diffusion sheet 310 has an area overlapped with the light guide plate 400 and is projected more than the other side of the light guide plate 400 from the other side of the light guide plate 400 facing the area where the light source 510 is disposed Structure. The upper surface area of the diffusion sheet 310 may be larger than the upper surface of the light guide plate 400.

The light collecting sheet 320 and the protective sheet 330 are overlapped with the diffusion sheet 310 and the light guide plate 400 in all areas. The lower surface area of the light collecting sheet 320 and the protective sheet 330 may be smaller than or equal to the upper surface area of the light guide plate 400.

The bottom cover 700 has a top surface opened. The bottom cover 700 protects the backlight unit 300. The bottom cover 700 is formed of a metal material to reinforce the rigidity of the backlight unit 300. The bottom cover 700 may be made of press water.

The support main body 200 is disposed on the back surface of the liquid crystal display panel 100. The support main body 200 houses the liquid crystal display panel 100. The support main body 200 is formed of a molded body of a rectangular frame shape. The support main 200 may be a plastic material. The support main 200 also houses the optical sheets 310, 320 and 330, the light guide plate 400, the light source 510 and the reflection sheet 600.

2 and 5, the edges of the support main 200 may have a stepped shape. The edge of the support main body 200 has a major axis direction L1 and a minor axis direction L2. The liquid crystal display panel 100 is attached corresponding to the major axis direction L1 and the minor axis direction L2 of the support main 200.

In order to adhere the support main body 200 and the liquid crystal display panel 100, a pad unit 230 is provided. The pad portion 230 includes a body 210 and a protrusion 220. The protrusion 220 of the pad unit 230 may have a hemispherical embossed shape. Accordingly, the pressing force by the liquid crystal display panel 100 can be dispersed in the embossed shape of the protrusion 220 of the pad unit 230. That is, by conventionally dispersing the one-sided force due to the embossed shape as a whole, the balance of force can be maintained. As a result, the liquid crystal display according to one embodiment can prevent the pushing light leakage by maintaining the balance of force.

The protrusions 220 formed on the pad portion 230 may be spaced apart from each other at regular intervals or may be formed adjacent to each other. Thereby further distributing the force with the embossed shape. That is, by arranging the embossed protrusions 220 at regular intervals, the balance of the force can be maintained, and by increasing the number of the protrusions 220 by arranging the embossed protrusions 220 adjacent to each other, Can be dispersed.

In addition, the protrusions 220 may have an embossed shape of the same size. If the size of the protrusion 220 is different, it is difficult to maintain the balance of the force. That is, embossed shapes of the same size may be spaced apart at regular intervals, or may be disposed adjacent to each other.

5, when the support main 220 and the liquid crystal display panel 100 are bonded together by the pad unit 230 of the liquid crystal display device, The force is dispersed as a whole due to the embossed shape of the protrusion 220. [ Accordingly, conventionally, by balancing the force which is concentrated on one side, the balance of the force can be maintained, and thus the pressed light leakage can be prevented.

The pad portion 230 may be formed on the support main 200 in the longitudinal direction L1 of the support main 200 to adhere the support main 200 and the liquid crystal display panel 100 together. That is, the pad unit 230 is first attached to the support main body 200 in the longitudinal direction L1 of the support main body 200, and adheres the liquid crystal display panel 100 corresponding thereto. Therefore, in the long axis direction L1 of the support main body 200, the protruding portion 220 is directed toward the liquid crystal display panel 100, so that the pushable light leakage caused by the liquid crystal display panel 100 can be prevented.

2, the pad unit 230 is formed on the liquid crystal display panel 100 corresponding to the minor axis L2 of the support main 200, and the support main 200, The display panel 100 can be bonded. That is, the pad unit 230 is attached to the liquid crystal display panel 100 corresponding to the pad main body 200 in the short axis direction L2 of the support main body 200, and adheres the support main body 200 corresponding thereto. Therefore, in the short axis direction L2 of the support main body 200, the protrusions 220 are directed toward the support main 200, so that the pushable light leakage caused by the liquid crystal display panel 100 can be prevented. However, the direction in which the projecting portion 220 is directed is not limited to the above-described direction as long as it can totally disperse the pressing force by the liquid crystal display panel 100. [

As a result, in the liquid crystal display device according to one embodiment, the pad portion 230 for bonding the support main 200 and the liquid crystal display panel 100 includes the embossed protrusion 220, So that the force balance can be balanced.

In addition, it is possible to improve the defect rate due to the light leakage, and to prevent the breakage of the glass caused by the unbalance of the force. The quality of the liquid crystal display device can be improved by preventing the light leakage and improving the defective ratio as described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the scope of the appended claims are intended to be embraced therein.

1 is an exploded perspective view illustrating a liquid crystal display device according to one embodiment.

FIG. 2 is a rear view and a pad of a liquid crystal display device according to an exemplary embodiment of the present invention.

3 is a cross-sectional view of the liquid crystal display device taken along line I-I 'in FIG.

4 is a cross-sectional view of the liquid crystal display device taken along the line II-II 'in FIG.

5 is a cross-sectional view illustrating a support main body and a liquid crystal display panel bonded together by a pad portion of a liquid crystal display device according to an embodiment.

Claims (5)

A liquid crystal display panel; A light guide plate disposed on a rear surface of the liquid crystal display panel; A support main body surrounding the light guide plate and housing the liquid crystal display panel; And And a pad portion for bonding the support main and the liquid crystal display panel, Wherein the pad portion includes a body and a protrusion, The edges of the support main are provided in a stepped shape, Wherein the pad portion is disposed at an edge of the support main body, Wherein the protrusions have a hemispherical embossing shape of a predetermined size and are spaced apart from each other at regular intervals or disposed adjacent to each other. delete delete The method according to claim 1, And the pad portion is disposed in the support main portion in the longitudinal direction of the support main portion to adhere the support main portion and the liquid crystal display panel. The method according to claim 1, Wherein the pad portion is disposed on a liquid crystal display panel corresponding to a minor axis direction of the support main, and the support main and the liquid crystal display panel are bonded to each other.

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