KR101759706B1 - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device according to an embodiment of the present invention includes: a cover bottom having a predetermined space therein; A backlight unit mounted inside the cover bottom; A liquid crystal panel for displaying an image by adjusting a light transmission amount from the backlight unit; A panel guide disposed on the backlight unit and guiding the liquid crystal panel; A flexible adhesive layer formed between the panel guide and the liquid crystal panel for attaching to the guide panel of the liquid crystal panel and for ensuring fluidity of the liquid crystal panel according to stress and pressure; And a set back cover formed to surround the bottom and side surfaces of the bottom cover and the side surfaces of the liquid crystal panel.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device, and more particularly, to a borderless type liquid crystal display device capable of preventing light spots and improving display quality.

2. Description of the Related Art [0002] Display devices have been developed in accordance with the market demand for large-sized and thinned products. Demand for flat panel display devices having advantages of thinning, light weight, and low power consumption is increasing.

Examples of flat panel display devices include a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), a light emitting diode (LED) Diode Display Device (OLED) and Organic Light Emitting Diode Display Device.

Of these flat panel display devices, liquid crystal display devices are securing a stable market due to the advantages of mass production technology, ease of driving means, low power consumption, thin thickness, high image quality and large screen realization, and application fields are being expanded.

1 is a cross-sectional view showing a conventional liquid crystal display device.

Referring to FIG. 1, a liquid crystal display according to the related art displays an image by adjusting a light transmittance of each pixel (liquid crystal cell) according to an input image signal. The liquid crystal display device includes a liquid crystal panel 10 in which pixels (liquid crystal cells) are arranged in a matrix form, a backlight unit 30 for supplying light to the liquid crystal panel 10, And a driving circuit (not shown) for driving the backlight.

Here, a lower polarizing film 14 is disposed below the liquid crystal panel 10, and an upper polarizing film 12 is disposed above the liquid crystal panel 10.

Since the liquid crystal panel 10 is formed of a light-receiving element having no self-luminous element, light is supplied from the backlight unit 30.

The backlight unit 30 includes a backlight (not shown) as a light source for generating light, a light guide plate or diffusion plate for emitting light generated from the backlight to the front of the liquid crystal panel 10, and a plurality of optical sheets for improving light efficiency .

The backlight unit 30 is divided into a direct type and an edge type depending on the type of the backlight.

In the edge type, a backlight is disposed in the lateral direction of the liquid crystal panel 10, and the light from the backlight is irradiated to the liquid crystal panel 10 through the light guide plate, which is advantageous for slimming down the liquid crystal display device.

In the direct lowering type, a plurality of backlights are disposed on the back surface of the liquid crystal panel 10, and light generated from a plurality of backlights is directly irradiated onto the entire surface of the liquid crystal panel 10, which is advantageous in high light efficiency.

In general, a cold cathode fluorescent lamp (CCFL), an electrodeless fluorescent lamp (EEFL), and a light emitting diode (LED) are applied to the backlight.

The liquid crystal display device includes a cover bottom 20, and the backlight unit 30 is mounted on the cover bottom 20. Then, the liquid crystal panel 10 is seated on the panel guide 40 provided in the cover bottom 20.

And a top case 50 formed to surround the side surface and the upper surface of the liquid crystal panel 10 are disposed. A set back cover 60 is disposed to cover a lower portion of the cover bottom 20 and a side surface portion of the top case 50 so as to cover a side portion of the top case 50 and an upper portion of the top case 50 The set front cover 70 is disposed.

In the liquid crystal display device according to the related art including the above-described configuration, the top case 50 and the set front cover 70 are disposed so as to surround the upper edge portion of the liquid crystal panel 10 to increase the thickness, .

In recent years, a liquid crystal display device emphasizing a design in order to satisfy aesthetic demands of users as well as functional items of a liquid crystal display device has been highlighted.

Accordingly, efforts to minimize (slim) the thickness of the liquid crystal display device have been steadily progressing, and there has been an increasing interest in designs that can stimulate the purchase of products by meeting the aesthetic demands of users. For example, a borderless type liquid crystal display device has been developed which minimizes the area and step of the outer frame (frame).

2 is a cross-sectional view showing a borderless type liquid crystal display device according to the related art.

Referring to FIG. 2, a borderless type liquid crystal display device according to the related art includes a liquid crystal panel 10 for displaying an image; A panel guide (42) on which the liquid crystal panel (10) is seated; A cover bottom 20 formed to cover a side surface and a part of a top surface of the liquid crystal panel 10; A backlight unit 30 for supplying light to the liquid crystal panel 10; A set back cover (62) formed to enclose the bottom and side surfaces of the cover bottom (20); And a tempered glass (not shown) disposed at the upper end of the set back cover 62 and the upper end of the liquid crystal panel 10. [

In the conventional borderless type liquid crystal display device, the thickness of the top case 50 and the set front cover 70 is reduced to reduce the thickness of the liquid crystal display device shown in FIG. 1, It is possible to minimize the area of the portion to satisfy the aesthetic demands of the viewer.

The borderless type liquid crystal display device shown in FIG. 2 has a structure in which the top case is omitted, so that a separate mechanism for fixing the liquid crystal panel or a structure for fixing the liquid crystal panel 10 through an adhesive material is adopted .

The liquid crystal display device shown in FIG. 1 guides the range in which the liquid crystal panel 10 flows using the top case, and ensures a slight fluidity with respect to the liquid crystal panel 10.

However, the borderless type liquid crystal display device shown in FIG. 2 has a structure in which the fluidity of the liquid crystal panel 10 can not be ensured because the liquid crystal panel is fixed to the panel guide with a tool or an adhesive material.

In addition, in the conventional borderless type liquid crystal display device, the liquid crystal panel 10 is completely fixed to the panel guide through the adhesive material, so that when the pressure is applied to the liquid crystal panel or stress is generated, It can not be bent or twisted.

When the liquid crystal panel 10 is twisted or warped, stress is generated in the liquid crystal panel 10, and a region in which the liquid crystal arrangement in the liquid crystal panel 10 is distorted is generated.

The light transmitted through the lower polarizing film 14 from the backlight can not be completely blocked by the upper polarizing film 12 in the region where the liquid crystal arrangement is distorted when the liquid crystal panel 10 is driven by the black screen, . Such light spots cause the display quality of the liquid crystal display device to deteriorate.

In order to solve the problems caused by the light spots of the liquid crystal panel 10, it is necessary to prevent the liquid crystal panel 10 from being bent or twisted by ensuring the fluidity of the liquid crystal panel 10 according to pressure and stress. However, It is not ensured that the fluidity of the fluid 10 is guaranteed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a borderless type liquid crystal display device capable of ensuring fluidity of a liquid crystal panel according to pressure and stress.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a borderless type liquid crystal display device capable of preventing light leakage caused by warpage or distortion of a liquid crystal panel.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

A liquid crystal display device according to an embodiment of the present invention includes: a cover bottom having a predetermined space therein; A backlight unit mounted inside the cover bottom; A liquid crystal panel for displaying an image by adjusting a light transmission amount from the backlight unit; A panel guide disposed on the backlight unit and guiding the liquid crystal panel; A flexible adhesive layer formed between the panel guide and the liquid crystal panel for attaching to the guide panel of the liquid crystal panel and for ensuring fluidity of the liquid crystal panel according to stress and pressure; And a set back cover formed to surround the bottom and side surfaces of the bottom cover and the side surfaces of the liquid crystal panel.

The liquid crystal display device according to an embodiment of the present invention includes a flexible adhesive layer formed of a spring type double-sided adhesive member and / or a cushion type adhesive member.

The liquid crystal display according to an embodiment of the present invention is characterized in that the liquid crystal panel includes a flexible adhesive layer formed of a soft material so that the liquid crystal panel can flow in the horizontal direction, the vertical direction, and the up / down direction.

The flexible adhesive layer of the liquid crystal display device according to the embodiment of the present invention is formed of a nonwoven material in which polystyrene, polyethyrene, polyurethane, silicone, or fibers are bonded in multiple layers.

The flexible adhesive layer of the liquid crystal display according to an embodiment of the present invention is characterized in that the flexible material is formed in the form of foam, rubber, or gasket.

The present invention can provide a borderless liquid crystal display device capable of ensuring the fluidity of a liquid crystal panel according to pressure and stress.

The present invention can provide a borderless type liquid crystal display device capable of preventing warping or distortion of the liquid crystal panel due to pressure and stress.

The present invention can provide a borderless type liquid crystal display device capable of preventing light leakage and improving display quality.

The present invention can provide a borderless type liquid crystal display device capable of reducing the thickness and increasing the satisfaction of the appearance design.

Other features and effects of the present invention may be newly understood through the embodiments of the present invention in addition to the features and effects of the present invention mentioned above.

1 is a cross-sectional view showing a liquid crystal display device according to a related art.
2 is a sectional view showing a borderless type liquid crystal display device according to the related art.
3 is a cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention.
4 is a plan view showing a liquid crystal display device according to an embodiment of the present invention.
5 is a sectional view showing a flexible adhesive layer of a liquid crystal display device according to an embodiment of the present invention;
6 is a plan view showing a liquid crystal display device according to another embodiment of the present invention.
7 and 8 are plan views showing a liquid crystal display device according to still another embodiment of the present invention.

Hereinafter, a liquid crystal display according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a cross-sectional view illustrating a liquid crystal display device according to an exemplary embodiment of the present invention, and FIG. 4 is a plan view illustrating a liquid crystal display device according to an exemplary embodiment of the present invention.

3 and 4, a liquid crystal display (LCD) device according to an exemplary embodiment of the present invention includes a liquid crystal panel 110 for displaying an image according to an input video signal; A backlight unit 130 that emits light to the liquid crystal panel 110; A panel guide 140 on which the liquid crystal panel 110 is mounted; A cover bottom 120 that supports the panel guide 140 and is configured to mount the backlight unit 130; A flexible adhesive layer 150 (adhesive member) disposed between the panel guide 140 and the liquid crystal panel 110 to fix the liquid crystal panel 110; And a set back cover 160 formed to cover the cover bottom 120 and the side surfaces of the liquid crystal panel 110.

Although not shown in the drawing, the liquid crystal display according to the embodiment of the present invention includes a driving circuit for driving the liquid crystal panel 110. [

The liquid crystal panel 110 is composed of an upper substrate and a lower substrate bonded together with a liquid crystal layer whose light transmittance is controlled according to an electric field.

The lower substrate of the liquid crystal panel 110 includes a plurality of gate lines and a plurality of data lines. Pixels are defined by the intersection of the gate lines and the data lines. A thin film transistor (TFT) And a storage capacitor are formed.

On the upper substrate of the liquid crystal panel 110, a color filter for emitting the light incident through the liquid crystal layer to specific color lights (R, G, B) and a black matrix BM for preventing mixing of color light are formed .

The lower polarizing film 114 is disposed on the lower portion of the liquid crystal panel 110 and the upper polarizing film 112 is disposed on the upper portion.

When a thin film transistor of each pixel is turned on by a driving signal applied to the gate line, a data voltage applied to the data line is applied to the pixel electrode.

The liquid crystal panel 110 is mounted on the panel guide 140 and the panel guide 140 is mounted on the cover bottom 120. Since the liquid crystal panel 110 does not generate self-luminescence, it needs a light source for supplying light and includes a backlight unit 130 including a backlight (light source) disposed on a side surface or a back surface of the liquid crystal panel 110 The light is supplied through the light source.

In the liquid crystal panel 110, liquid crystals are arranged in accordance with an electric field formed by the common voltage Vcom applied to the common electrode and the data voltage applied to the pixel electrode, and the light transmission amount from the backlight unit 130 Thereby displaying an image.

The backlight unit 130 includes a plurality of backlights for generating light to be supplied to the liquid crystal panel 110, a light guide plate (or diffusion plate) for emitting the light from the backlight to the front surface of the liquid crystal panel 110, And at least one optical sheet. The backlight unit 130 is mounted in a predetermined space provided inside the cover bottom 120.

The cover bottom 120 is formed to have a bottom surface and a side wall surface extending from the bottom surface, and a predetermined space is provided in the inside. The backlight unit 130 and the panel guide 140 described above are mounted in the inner space of the cover bottom 120.

In the case of a liquid crystal display device having a large screen, a pressure may be applied to the liquid crystal panel 110, or stress may be generated. When the liquid crystal panel 110 is fixed so as not to flow, warping may occur or may be distorted. When the liquid crystal panel 110 is bent or twisted, the light transmitted through the lower polarizing film from the backlight can not be completely blocked by the upper polarizing film, so that light spots can be generated.

In order to prevent this, a liquid crystal display device according to an embodiment of the present invention forms a flexible adhesive layer 150 that ensures fluidity of the liquid crystal panel 110 in a predetermined area of a panel guide 140 on which the liquid crystal panel 110 is placed And the liquid crystal panel 110 is attached to the panel guide 140 using the flexible adhesive layer 150.

4, the flexible adhesive layer 150 may be patterned to have a predetermined area, and a plurality of flexible adhesive layers 150 may be disposed on the panel guide 140 at regular intervals . That is, a plurality of flexible adhesive layers 150 are formed so as to correspond to the rims of the liquid crystal panel 110, so that the liquid crystal panel 110 can be attached to the panel guide 140.

5 is a cross-sectional view showing a flexible adhesive layer of a liquid crystal display device according to an embodiment of the present invention.

5, the flexible adhesive layer 150 includes a base layer 156; An upper adhesive layer 152; And a lower adhesive layer 154.

The flexible adhesive layer 150 is formed of a spring-type double-sided adhesive member, so that flexibility of fluidity in the horizontal, vertical and upward / downward directions of the liquid crystal panel 110 can be ensured. Further, the flexible adhesive layer 150 may be formed of a cushion type double-sided adhesive member to ensure the fluidity flexibility of the liquid crystal panel 110 in the upward and downward directions. 7, the flexible adhesive layer 150 is formed by applying the spring type and the cushion type in combination.

The upper adhesive layer 152 and the lower adhesive layer 154 have adhesiveness so that the upper adhesive layer 152 is adhered to the back surface of the liquid crystal panel 110 and the lower adhesive layer 154 is adhered to the upper surface of the panel guide 140 do.

The flexible adhesive layer 150 of the base layer 156 serves to compensate the degree of freedom of fluidity of the liquid crystal panel 110 due to the applied pressure and to reduce the stress generated in the liquid crystal panel 110, And the like.

For example, the base layer 156 may be formed of a material of nonwoven fabric in which polystyrene, polyethylene, polyurethane, silicone, or fibers are bonded in multiple layers, For example, in the form of a foam, a rubber, or a gasket. At this time, the flexible adhesive layer 150 may be formed so that an area attached to the liquid crystal panel 110 is less than a predetermined area in order to reduce the stress inside the liquid crystal panel 110.

The flexible adhesive layer 150 allows the liquid crystal panel 110 to flow at a predetermined portion in the X, Y, and Z axial directions by the stress generated in the liquid crystal panel 110 and the applied pressure, It is possible to prevent the liquid crystal panel 110 from being bent or twisted. This prevents light leakage when the liquid crystal panel 110 is driven by the black image, thereby preventing deterioration of the display quality due to the light leakage.

6 is a plan view showing a liquid crystal display device according to another embodiment of the present invention.

In the above description with reference to FIG. 4, the flexible adhesive layer 150 is formed on a predetermined area of the panel guide 140, but this is an embodiment of the present invention.

6, a liquid crystal display device according to another exemplary embodiment of the present invention includes a liquid crystal panel 110 and a PCB of the driving circuit unit 170 among four upper surfaces of the panel guide 140 on which the liquid crystal panel 110 is mounted. The flexible adhesive layer 250 may be disposed in a bar shape on three sides except for one side to be connected.

Here, the flexible adhesive layer 250 may be formed in the same manner as the structure shown in FIG. 5, and the material and the shape may be formed as shown in Table 1.

At this time, the flexible adhesive layer 250 is formed of a spring-type double-sided adhesive member, so that flexibility of fluidity in the horizontal, vertical and upward and downward directions of the liquid crystal panel 110 can be secured. In addition, the flexible adhesive layer 250 may be formed of a cushion type adhesive member to ensure the fluidity flexibility of the liquid crystal panel 110 in the upward and downward directions.

The flexible adhesive layer 250 allows the liquid crystal panel 110 to flow at a predetermined portion in the X, Y, and Z axial directions by the stress generated in the liquid crystal panel 110 and the applied pressure, It is possible to prevent the liquid crystal panel 110 from being bent or twisted. This prevents light leakage when the liquid crystal panel 110 is driven by the black image, thereby preventing deterioration of the display quality due to the light leakage.

6, the flexible adhesive layer 250 is formed on one surface of the upper surface of the panel guide 140 on which the liquid crystal panel 110 is mounted, on which the liquid crystal panel 110 and the PCB of the driving circuit unit 170 are connected But it is an example of the present invention. In the embodiment shown in FIG.

7, the flexible adhesive layer 250 is formed in a bar shape on two sides of four upper surfaces of the panel guide 140 on which the liquid crystal panel 110 is mounted .

8, the flexible adhesive layer 250 may be formed in a bar shape so as to surround the upper four surfaces of the panel guide 140 on which the liquid crystal panel 110 is mounted. have.

The liquid crystal display device according to the embodiment of the present invention including the above-described configuration can realize the borderless and satisfy the aesthetic requirement of the user. In addition, it is possible to prevent the light leakage due to the stress generated in the liquid crystal panel 110 and the applied pressure, thereby improving the display quality of the image.

It will be understood by those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

110: liquid crystal panel 112: upper polarizing film
114: lower polarizing film 120: cover bottom
130: Backlight unit 140: Panel guide
150: flexible adhesive layer 152: upper adhesive layer
154: lower adhesive layer 156: base layer
160: set back cover 170: driving circuit part

Claims (10)

A cover bottom having a predetermined space therein;
A backlight unit mounted inside the cover bottom;
A liquid crystal panel for displaying an image by adjusting a light transmission amount from the backlight unit;
A panel guide disposed on the backlight unit and guiding the liquid crystal panel;
A flexible adhesive layer formed between the panel guide and the liquid crystal panel to attach the liquid crystal panel to the panel guide and to ensure fluidity of the liquid crystal panel according to stress and pressure; And
And a set back cover formed to cover the bottom and side surfaces of the cover bottom and the side surfaces of the liquid crystal panel,
Wherein the flexible adhesive layer is arranged in a patterned manner so as to have a predetermined area,
Wherein the plurality of patterned flexible adhesive layers are arranged at regular intervals on an upper portion of the panel guide,
Wherein the plurality of flexible adhesive layers are disposed so as to correspond to a rim portion of the liquid crystal panel,
The flexible adhesive layer may be,
A base layer;
An upper adhesive layer formed on the base layer and adhered to a back surface of the liquid crystal panel; And
And a lower adhesive layer formed under the base layer and adhered to the upper surface of the panel guide,
The base layer can cancel the stress generated in the liquid crystal panel, ensure the flexibility of the liquid crystal panel due to the pressure applied to the liquid crystal panel,
The base layer is formed of a non-woven material in which fibers are bonded in multiple layers,
The nonwoven fabric forming the base layer is formed in a gasket shape,
The flexible adhesive layer flows the liquid crystal panel in the X, Y, and Z axis directions according to the stress generated in the liquid crystal panel and the applied pressure, thereby preventing the liquid crystal panel from being bent or twisted by the stress and pressure. . The method according to claim 1,
The flexible adhesive layer may be,
A spring type double-sided adhesive member, or a cushion type adhesive member. The method according to claim 1,
The flexible adhesive layer may be,
Wherein the liquid crystal panel is made of a flexible material so that the liquid crystal panel can be moved in a horizontal direction, a vertical direction, and a vertical direction. delete The method according to claim 1,
Wherein the base layer further comprises a material selected from the group consisting of polystyrene, polyethyrene, polyurethane, and silicone. 6. The method of claim 5,
The polystyrene, polyethyrene, and polyurethane contained in the base layer are formed in a flexible foam,
Wherein the silicon contained in the base layer is in the form of a soft rubber. delete delete delete The method according to claim 1,
Wherein the set back cover is formed to open the upper surface of the liquid crystal panel.

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