KR20110016795A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display device is provided to enhance the failure by using a stepped structure of a support main and reduce the failure generated in assembling. CONSTITUTION: An LCD panel(110) projects the outside of a color filter substrate to an outside direction. A support main(170) supports the edge of the LCD panel. A plurality of stepped units prevents the contact of the support main and one side of the color filter substrate.

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 that can reduce the defects caused during assembly.

Cathode ray tube (CRT), one of the widely used display devices, is mainly used for monitors such as TVs, measuring devices, and information terminal devices, but the size and weight of electronic products are reduced due to the weight and size of CRT itself. Could not actively respond to the response.

As a solution to this problem, the liquid crystal display device has a tendency that its application range is gradually widening due to the features such as light weight, thinning, low power consumption driving. Accordingly, in order to meet the needs of users, liquid crystal display devices are progressing in the direction of large area, thinning, and low power consumption.

BACKGROUND ART A liquid crystal display device is a display device that displays an image by controlling an amount of light passing through a liquid crystal, and is widely used for advantages such as thinning and low power consumption.

Unlike the CRT, the liquid crystal display is not a display device that emits light by itself, and thus, a backlight unit including a separate light source is provided on the back of the liquid crystal display panel to provide light for visually representing an image.

The backlight unit has two types, a direct method and an edge method, depending on the position of the light source.

In the edge method, a light source is disposed on a side of a flat plate, and the light emitted from the light source is irradiated onto the entire surface of the liquid crystal display panel using a light guide plate. On the other hand, in the direct method, a plurality of light sources are disposed on the back of the liquid crystal display panel to directly irradiate light directly under the liquid crystal display panel, so that the luminance can be increased by a plurality of light sources compared to the edge method, and the light emitting surface is wider. There is an advantage to this.

The liquid crystal display panel has a structure in which the thin film transistor substrate and the color filter substrate are disposed to face each other, and the thin film transistor substrate and the color filter substrate are bonded by a seal pattern, and then liquid crystal is injected therebetween.

In general liquid crystal display panels, the area of the thin film transistor substrate is wider than that of the color filter substrate. Recently, the area of the thin film transistor substrate and the color filter substrate are equally produced to improve the production yield.

The liquid crystal display panel is housed in a support main made of a mold.

When the liquid crystal display panel having the same area of the thin film transistor substrate and the color filter substrate is bonded together, one side of the color filter substrate is often protruded outward from one side of the corresponding thin film transistor substrate. One side of the color filter substrate protrudes outward from the one side of the thin film transistor substrate corresponding thereto and is bonded because the alignment occurs at the time of bonding.

In a general liquid crystal display device having such a structure, one side of the color filter substrate protruding outward than one side of the thin film transistor substrate is formed on the edge step surface of the support main for supporting the liquid crystal display panel in the process of storing the liquid crystal display panel in the support main. There was a problem that the foreign matter caused by the friction occurs. In addition, in a general liquid crystal display device, a seal pattern bonded between one side of a color filter substrate in contact with the edge step surface of the support main and one side of the thin film transistor substrate corresponding to the pressure caused by the contact between the color filter substrate and the support main is applied. Therefore, there is a problem that the color filter substrate and the thin film transistor substrate are separated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device capable of improving defects occurring during assembly.

Liquid crystal display device according to an embodiment of the present invention,

A liquid crystal display panel in which an outer side of the color filter substrate protrudes outward from one side of the thin film transistor; A support main supporting an edge of the liquid crystal display panel; And a plurality of stepped portions on one side upper surface of the support main to prevent contact with the protruding side surfaces of the color filter substrate, wherein the stepped height of each of the plurality of stepped portions is greater than the side height of the thin film transistor substrate. It is made small.

The present invention can prevent the occurrence of foreign substances by preventing the support main from contacting the color filter substrate protruding outward from one side of the thin film transistor substrate.

Also, when the liquid crystal display panel having the color filter substrate protruding outward from the one side of the thin film transistor substrate is accommodated in the support main, the color filter substrate protruding outward is brought into contact with the side surface of the support main to form a seal pattern. By doing so, it is possible to prevent a defect in which the color filter substrate and the thin film transistor substrate bonded together are separated.

That is, the support main of the present invention has a plurality of stepped structures. In the stepped structure, the step height is smaller than the side height of the thin film transistor substrate to prevent contact between the protruding side of the color filter substrate and the side of the support main. The defect of the liquid crystal display panel in the process can be minimized.

Hereinafter, exemplary 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 according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view of the liquid crystal display taken along the line II ′ of FIG. 1.

As shown in FIG. 1 and FIG. 2, the liquid crystal display according to the exemplary embodiment of the present invention is provided with a liquid crystal display panel 110 on which an image is displayed and is disposed under the liquid crystal display panel 110 to provide light. The backlight unit 120 includes a support main 170 for accommodating the liquid crystal display panel 110 and the backlight unit 120.

Although not shown in detail, the liquid crystal display panel 110 may be a thin film transistor (TFT) substrate 111 and a color filter substrate 113 bonded together to maintain a uniform cell gap facing each other, and the thin film transistor. The liquid crystal layer is interposed between the substrate 111 and the color filter substrate 113.

First and second polarizing plates POL1 and POL2 are attached to upper and lower surfaces of the liquid crystal display panel 110, respectively.

In the thin film transistor substrate 111, a plurality of gate lines are formed, a plurality of data lines intersecting the plurality of gate lines are formed, and a thin film transistor TFT is formed at an intersection area of the gate line and the data line.

The color filter substrate 113 includes color filters of R, G, and B colors corresponding to each pixel, a black matrix bordering each of them, and covering a gate line, a data line, a thin film transistor, and the like, and a common electrode covering all of them. do.

The thin film transistor substrate 111 and the color filter substrate 113 are bonded to each other by a seal pattern.

In the liquid crystal display panel 110 according to the exemplary embodiment of the present invention, the areas of the thin film transistor substrate 111 and the color filter substrate 113 facing each other have the same area, and the thin film transistor substrate 111 and the color filter are the same. When the substrate 113 is bonded, one side of the color filter substrate 113 protrudes outward from the one side of the thin film transistor substrate 111 according to an alignment error.

Although not shown in the drawing, a panel driving PCB (not shown) for supplying a scan signal to the gate line and a data signal to the data line is provided at the edge of the liquid crystal display panel 110.

The backlight unit 120 disposed on the rear surface of the liquid crystal display panel 110 may be disposed in parallel with the light source 150 and the light source 150 disposed on one side of the support main 170 to provide point light or linear light. A light guide plate 140 for converting into surface light, optical sheets 130 disposed on the light guide plate 140 to diffuse and collect light emitted from the light guide plate 140, and disposed below the light guide plate 140. The reflective sheet 160 may reduce light loss by reflecting light traveling in a downward direction of the light guide plate 140 to the liquid crystal display panel 110.

The light source 150 may be provided with a lamp or a light emitting diode (LED).

The light guide plate 140 is made of a poly methly methacrylate (PMMA) material, and although not shown in detail, the light guide plate 140 may have a wedge shape in which the thickness becomes thinner as the light source 150 moves away from the incident surface. A prism pattern for refracting incident light in the direction of the optical sheets 130 may be formed on the rear surface of the light guide plate 140.

The optical sheets 130 include a diffusion sheet for diffusing light, a light collecting sheet for collecting light, and a protective sheet for protecting the light collecting sheet.

The diffusion sheet, the light collecting sheet, and the protective sheet are sequentially disposed on the light guide plate 140.

The support main 170 is formed of a rectangular frame, and has a function of supporting the liquid crystal display panel 110 while accommodating the backlight unit 120.

The structure of the support main 170 will be described in detail with reference to FIGS. 3 and 4.

FIG. 3 is a perspective view showing a part of the support main of FIG. 1, and FIG. 4 is a cross-sectional view showing a region A of the support main of FIG. 3.

As shown in Figures 2 to 4, the support main 170 according to an embodiment of the present invention has a plurality of stepped structure on one side upper surface.

One side upper surface of the support main 1170 includes a first surface 171 adjacent to one end of the support main 170 and a second surface 174 having a step shape inward from the first surface 171. do.

An inclined surface 173 is inclined between the first and second surfaces 171 and 174, and a boundary area between the first surface 171 and the inclined surface 173 is a rounded bent part 172. ) Is formed.

The inclined surface 173 and the vent part 172 may minimize the problem that the side surface of the color filter substrate 113 is in contact with the first surface 171 in the process of assembling the liquid crystal display panel 110 to the support main 170. It is formed to prevent.

The height w1 between the first surface 171 and the second surface 174 is smaller than the side height of the thin film transistor substrate 111.

When the liquid crystal display panel 110 is accommodated, the support main 170 may include first and second surfaces 171 and 174 having a stepped structure such that one side of the color filter substrate 113 does not contact the first surface 171. ) Is formed, and the height w1 between the first and second surfaces 171 and 174 is smaller than the side height of the thin film transistor substrate 111 so that one side of the color filter substrate 113 is the upper portion of the support main 170. The problem of contact with the surface can be prevented.

Here, in an embodiment of the present invention, the inclined surface 173 is formed between the first and second surfaces 171 and 174, and the vent part 172 is formed at the boundary area between the first surface 171 and the inclined surface 173. Although the structure in which the cross-section) is formed is described in detail, the present invention is not limited thereto, and the first and second surfaces 171 and 174 may have an angled structure.

The support main 170 includes a third surface 175 having a stepped shape inward from the second surface 174.

The second and third surfaces 174 and 175 have a stepped structure having an angular shape, and the height w2 between the second surface 174 and the third surface 175 is a side surface of the thin film transistor substrate 111. It is made smaller than the height.

When the liquid crystal display panel 110 is accommodated, the support main 170 includes second and third surfaces 174 and 175 having a stepped structure such that one side of the color filter substrate 113 does not contact the second surface 174. ) Is formed, and the height w2 between the second and third surfaces 174 and 175 is smaller than the side height of the thin film transistor substrate 111 so that one side of the color filter substrate 113 is the upper portion of the support main 170. The problem of contact with the surface can be prevented.

The support main 170 includes a fourth surface 176 having a stepped shape inward from the third surface 175.

The third and fourth surfaces 175 and 176 have a stepped structure having an angular shape, and the height w3 between the third surface 175 and the fourth surface 176 is defined by the thin film transistor substrate 111. It is made smaller than the side height.

The fourth surface 176 has a function of supporting an edge of a lower surface of the thin film transistor substrate 111 of the liquid crystal display panel 110.

When the liquid crystal display panel 110 is accommodated, the support main 170 includes third and fourth surfaces 175 and 176 having a stepped structure such that one side of the color filter substrate 113 does not contact the third surface 175. ) Is formed, and the height w3 between the third and fourth surfaces 175 and 176 is smaller than the side height of the thin film transistor substrate 111 so that one side of the color filter substrate 113 is the upper portion of the support main 170. The problem of contact with the surface can be prevented.

The lower side of the inner side of the support main 170 includes a protrusion 177 protruding inward.

The protrusion 177 has a function of supporting the backlight unit 120 of FIG. 1. Here, the edge of the reflective sheet 160 is seated on the upper surface of the protrusion 177.

As described above, the liquid crystal display according to the exemplary embodiment of the present invention prevents contact between the support main 170 and the color filter substrate 113 protruding outward from one side of the thin film transistor substrate 111. It can prevent occurrence.

In addition, the liquid crystal display according to the exemplary embodiment of the present invention houses the liquid crystal display panel 110 having the color filter substrate 113 protruding outward from one side of the thin film transistor substrate 111 in the support main 170. In this case, the color filter substrate 113 protruding outward may contact the side surface of the support main 170 to prevent the color filter substrate 113 and the thin film transistor substrate 111 from being bonded by the seal pattern. Can be.

That is, the support main 170 of the present invention has a plurality of stepped structures, and in the stepped structure, the step height is smaller than the side height of the thin film transistor substrate 111 and the protruding side surfaces and the support of the color filter substrate 111 are supported. By preventing contact between side surfaces of the main 170, defects of the liquid crystal display panel 110 may be minimized during assembly.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display taken along the line II ′ of FIG. 1.

3 is a perspective view illustrating a part of the support main of FIG. 1.

4 is a cross-sectional view illustrating a region A of the support main of FIG. 3.

Claims (8)

A liquid crystal display panel in which an outer side of the color filter substrate protrudes outward from one side of the thin film transistor; A support main supporting an edge of the liquid crystal display panel; And And a plurality of stepped portions on one side upper surface of the support main to prevent contact with the protruding side surfaces of the color filter substrate. And a step height of each of the plurality of step portions is smaller than a side height of the thin film transistor substrate. According to claim 1, The plurality of stepped portions, A first surface adjacent to one end of the support main; A second surface having a step shape inwardly from the first surface; A third surface having a step shape inwardly from the second surface; And And a fourth surface having a stepped shape inward from the third surface. The method of claim 2, And an inclined inclined surface is formed between the first and second surfaces. The method of claim 3, And a bent part having a round shape is formed between the first surface and the inclined surface. The method of claim 2, And the second and third surfaces have an angled stepped structure. The method of claim 2, And the third and fourth surfaces have an angled stepped structure. The method of claim 2, And the fourth surface supports an edge of the liquid crystal display panel. According to claim 1, And a protrusion which protrudes inward to support the backlight unit on an inner lower surface of the support main.

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