KR20070031043A - Liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and to prevent cracks in an LCD panel or an LCD driving IC due to an external impact, the LCD panel, an LCD driving IC for operating the LCD panel, an LCD panel, and an LCD driving IC. In order to prevent the separation of the LCD panel, a liquid crystal display including a chassis formed on an upper portion of the LCD panel and a buffer pad for preventing a crack of the LCD driving IC due to external impact is provided.

Liquid crystal display, cracks, prevention, tape

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is an exploded perspective view of a liquid crystal display according to the related art.

2 is a partial cross-sectional view showing an arrangement state of a top chassis and an LCD driving IC of a liquid crystal display according to the prior art.

3 is a partial cross-sectional view showing the arrangement of the LCD panel and the mold frame of the liquid crystal display according to the prior art.

4 is a cross-sectional view of a liquid crystal display according to a first exemplary embodiment of the present invention.

5 is a cross-sectional view of a liquid crystal display according to a second exemplary embodiment of the present invention.

6 is a cross-sectional view of a liquid crystal display according to a third exemplary embodiment of the present invention.

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

5: top chassis 10: LCD panel

18: buffer pad 15: LCD drive IC

30: LED flexible printed circuit board 35: LED

40: prism sheet 50: diffuser plate

60: light guide plate 70: mold frame

78: buffer pad 80: reflector

90: bottom chassis

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a buffer pad for preventing cracks in an LCD panel or an LCD driving IC due to an external impact.

The liquid crystal display device has advantages of small size, light weight, and large screen compared with the conventional CRT (Cathode Ray Tube), and its development is being actively conducted. The monitor, large display device, It is also used in a display device of a mobile communication terminal, and its use range is rapidly expanding.

Such a liquid crystal display device displays a desired image on a screen by adjusting the amount of light transmitted according to image signals applied to a plurality of control switches arranged in a matrix form, and operates an LCD panel that directly displays an image. The LCD driving IC, a backlight unit used as a light source of the liquid crystal display, and a chassis for fastening each component of the liquid crystal display as one.

1 is an exploded perspective view of a general liquid crystal display device.

The liquid crystal display includes a top chassis 5, an LCD panel 10, an LCD driver IC 15 mounted on the LCD panel, an LED flexible printed circuit board (LED-FPC) 30, and the LED flexible printed circuit. An LED 35 mounted on a substrate, a plurality of prism sheets 40, a diffusion plate 50, a light guide plate 60, a mold frame 70, a reflector plate 80, and a bottom chassis 90 are included.

The LCD panel 10 includes a color filter substrate and a thin firm transistor (TFT) substrate. The LCD driver IC 15 is mounted on the LCD panel 10, applies a predetermined gate signal to a gate line of the TFT substrate, and applies a predetermined data signal to a data line.

The LED 35 mounted on the LED flexible printed circuit board 30 is disposed adjacent to one side of the light guide plate 60, and the plurality of prism sheets 40 and the diffusion plate 50 are formed on the light guide plate ( 60 is disposed on the upper portion of the light guide plate 60 to uniform the luminance distribution of the light emitted from the light guide plate 60. A plate having a high light reflectivity is used as the reflector plate 80, which is installed to contact the bottom surface of the bottom chassis 90, and the top chassis 5 is coupled to the bottom chassis 90 to form a backlight unit. Each component of the liquid crystal display device is fastened to one.

2 is a partial cross-sectional view showing an arrangement state of a top chassis and an LCD driving IC of a liquid crystal display according to the prior art.

Referring to FIG. 2, an LCD driving IC 15 for operating the LCD panel 10 is mounted at one end of the LCD panel 10 of the liquid crystal display device. The top chassis 5 covers the upper part of the LCD panel and the lower part of the rectangular frame to surround the sides of the liquid crystal display device in order to fasten the components of the liquid crystal display device including the LCD panel 10 and the LCD driver IC 15 into one. It is coupled to the bottom chassis (not shown) formed in.

Here, the top chassis 5 and the LCD driver IC 15 are disposed to be spaced apart by a predetermined interval. As a result, when the liquid crystal display falls from a high place or when an external shock is applied, the LCD driver IC 15 collides with the top chassis 5, and the LCD driver IC 15 is often broken. Will occur.

3 is a partial cross-sectional view showing the arrangement of the LCD panel and the mold frame of the liquid crystal display according to the prior art.

Referring to FIG. 3, the light guide plate 60 and a plurality of optical sheets 40 and 50 formed on the light guide plate are disposed in an internal space of the mold frame 70. The LCD panel 10 on which the LCD driver IC 15 is mounted is disposed on the plurality of optical sheets. In this case, the LCD panel and the mold frame are spaced apart from each other by a predetermined interval. As a result, the LCD panel collides with the mold frame when the liquid crystal display device is dropped from a high place or an impact is applied from the outside. This breakage often occurs.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-described problems, and a technical problem to be solved by the present invention is that the LCD panel or the LCD driving IC collides with other components of the liquid crystal display device and is broken even when an external impact is applied to the liquid crystal display device. In order to prevent that, it is to provide a liquid crystal display device having a buffer pad.

According to an aspect of the present invention for achieving the object of the present invention, an LCD panel; An LCD driving IC for operating the LCD panel; In order to prevent separation of the LCD panel and the LCD driving IC, there is provided a liquid crystal display comprising a buffer pad for preventing a crack of the LCD driving IC due to a chassis and an external impact formed on the LCD panel. .

The buffer pad is formed to cover the LCD driving IC.

The LCD driving IC is formed on the LCD panel by using a chip on glass (COG) method.

The LCD driving IC is formed on a film by using a Tape Carrier Package (TCP) method.

The thickness of the buffer pad is characterized in that 0.07 to 0.09mm.

The buffer pad is characterized in that the insulating tape.

According to another aspect of the present invention for achieving the object of the present invention, an LCD panel; An LCD driving IC for operating the LCD panel; A chassis formed on the LCD panel to prevent separation of the LCD panel and the LCD driving IC; A predetermined storage space is formed, and includes a mold frame in which the LCD panel is disposed and a buffer pad for preventing cracking of the LCD panel due to external impact.

The buffer pad is formed between the LCD panel and the mold frame.

The buffer pad is characterized in that the thickness of 0.1 to 0.3mm.

The buffer pad is characterized by consisting of a compound comprising a polyurethane.

The apparatus may further include a buffer pad for preventing a crack of the LCD driver IC due to an external shock, wherein the buffer pad is formed to cover the LCD driver IC.

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

4 is a cross-sectional view of a liquid crystal display according to a first exemplary embodiment of the present invention.

Referring to FIG. 4, the liquid crystal display includes a top chassis 5, an LCD panel 10, an LCD driving IC 15, and a buffer pad 18.

In the LCD panel 10, light having uniform brightness incident from a white surface light source passes through pixels of an LCD panel equipped with three types of color filters of R (red), G (green), and B (blue). The transmission amount of is adjusted according to the signal voltage input from the LCD driving IC to display various types of characters, figures and color images. The LCD panel 10 includes a color filter substrate and a thin firm transistor (TFT) substrate, wherein the color filter substrate is an RGB pixel which is a color pixel in which a predetermined color is expressed while light passes through the thin film process. Formed by the substrate. A common electrode made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO) is coated on the front surface of the color filter substrate.

The TFT substrate is a transparent glass substrate on which TFTs in matrix form are formed. The data line is connected to the source terminal of the TFTs, and the gate line is connected to the gate terminal. In addition, a pixel electrode made of a transparent electrode made of a transparent conductive material is formed in the drain terminal. When an electrical signal is input to the data line and the gate line, each TFT is turned on or turned off to apply an electrical signal necessary for pixel formation of the drain terminal. When the TFT is turned on by applying power to the gate terminal and the source terminal of the TFT substrate, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate, and thus the liquid crystal injected between the TFT substrate and the color filter substrate. The arrangement of and the light transmittance is changed according to the changed arrangement to obtain the desired image.

The LCD driving IC 15 is mounted on the LCD panel 10 using a COG method and electrically connected to the LCD panel 10 to operate the LCD panel. The LCD driver IC 15 includes a gate driver and a data driver, wherein the gate driver applies a predetermined gate signal to a gate line of the TFT substrate, and the data driver applies a predetermined data signal to a data line. . In the present embodiment, only the case where the LCD driving IC is mounted on the LCD panel is described. However, the LCD driving IC may be formed on a film using a tape carrier package (TCP) method.

The top chassis 5 is formed in a rectangular frame having a flat portion and a sidewall portion that are bent at right angles to prevent the LCD panel 10 and the LCD driver IC 15 from being separated from each other and to protect them from impacts applied from the outside. . The top chassis is combined with a bottom chassis (not shown) to fasten each component of the liquid crystal display into one.

The buffer pad 18 is disposed to cover the LCD driver IC 15 to fill a space between the top chassis 5 and the LCD driver IC 15. At this time, a variety of materials may be used as the buffer pad 18, but an insulating tape is used in the present embodiment, and the thickness thereof is formed to be 0.07 to 0.09 mm. In this way, when the buffer pad 18 is disposed on the LCD driver IC 15, even if an external shock is applied to the liquid crystal display device, the buffer pad formed between the top chassis and the LCD driver IC absorbs the shock, so that the LCD is absorbed. It is possible to prevent the driving IC from being damaged.

5 is a cross-sectional view of a liquid crystal display according to a second exemplary embodiment of the present invention.

Referring to FIG. 5, the liquid crystal display includes a top chassis 5, an LCD panel 10, an LCD driving IC 15 mounted on the LCD panel, and an LED flexible printed circuit board (LED-FPC) 30. ), An LED 35 mounted on the LED flexible printed circuit board, a plurality of prism sheets 40, a diffusion plate 50, a light guide plate 60, a mold frame 70, a buffer pad 78, and a reflection plate ( 80 and bottom chassis 90.

The light guide plate 60 is disposed in an inner space of the mold frame 70, and the LED 35 mounted on the LED flexible printed circuit board 30 is disposed adjacent to one side of the light guide plate 60. The light is incident on the light guide plate 60, and the plurality of prism sheets 40 and the diffusion plate 50 are disposed above the light guide plate 60 to uniform the luminance distribution of the light emitted from the light guide plate 60.

The light guide plate 60 changes the light generated by the LED 35 into light having an optical distribution in the form of a surface light source, and a wedge type plate or a parallel flat plate may be used as the light guide plate 60. It is not limited.

A plate having a high light reflectivity is used as the reflector plate 80, which is installed to contact the bottom surface of the bottom chassis 90, and the top chassis 5 is coupled to the bottom chassis 90 to form a backlight unit. And each component of the liquid crystal display device is fastened to one. As the reflective plate 80, a plate having a high light reflectance is used, which is installed to contact the bottom surface of the bottom chassis 90. Although the reflective plate 80 is illustrated as having a flat shape, the reflective plate 80 may be manufactured in a curved shape having a reference reflective surface and a triangular protrusion protruding from the reference reflective surface. In addition, the reflective plate may be omitted by forming a material having excellent reflection efficiency on the bottom surface of the bottom chassis 90.

The LCD panel 10 having the LCD driver IC 15 mounted thereon is disposed on the plurality of prism sheets 40, and one end thereof is disposed on the mold flame 70.

A buffer pad 78 is disposed in a space between the mold frame 70 and the LCD panel 10. At this time, a variety of materials may be used as the buffer pad 78, but in the present embodiment, a tape made of a compound including polyurethane is used, and the thickness thereof is formed to be 0.1 to 0.3 mm.

In this way, when the buffer pad 78 is disposed between the mold frame and the LCD panel, even if an external shock is applied to the liquid crystal display device, the shock absorbing pad absorbs the shock, so that the LCD panel collides with the mold frame and is damaged. Can be prevented.

6 is a cross-sectional view of a liquid crystal display according to a third exemplary embodiment of the present invention, in which the third exemplary embodiment shown in FIG. 6 is a buffer pad illustrated in the first embodiment and a buffer pad illustrated in the second embodiment. It is a liquid crystal display including all of them.

Referring to FIG. 6, the first buffer pad 18 of the liquid crystal display device covers the LCD driving IC 15 so as to fill the space between the top chassis 5 and the LCD driving IC 15. In addition, the second buffer pad 78 may be disposed in a space between the mold frame 70 and the LCD panel 10.

As such, when the first and second buffer pads 18 and 78 are formed, the shock can be absorbed more efficiently than the first or second embodiment.

What has been described above is only an exemplary embodiment of a liquid crystal display device having a buffer pad according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, the present invention Without departing from the gist of the present invention, those skilled in the art to which the present invention pertains to the technical spirit of the present invention to the extent that various modifications can be made.

As described above, according to the present invention, an external impact on the liquid crystal display device by covering the LCD driving IC mounted on the LCD panel of the liquid crystal display device or by forming a buffer pad in a space spaced between the LCD panel and the mold frame. Even if this is applied, it is possible to prevent the LCD panel or the LCD driving IC from colliding with other components of the liquid crystal display device, such as a top chassis or a mold frame.

Claims (12)

In the liquid crystal display device, LCD panel; An LCD driving IC for operating the LCD panel; In order to prevent separation of the LCD panel and the LCD driving IC, the chassis formed on the LCD panel and And a buffer pad for preventing cracking of the LCD driving IC due to external impact. The method of claim 1, And the buffer pad is formed to cover the LCD driving IC. The method of claim 2, The LCD driving IC is formed on the LCD panel using a chip on glass (COG) method. The method of claim 2, The LCD driving IC is formed on a film by using a Tape Carrier Package (TCP) method. The method of claim 2, The buffer pad has a thickness of 0.07 to 0.09 mm. The method of claim 2, And the buffer pad is an insulating tape. In the liquid crystal display device, LCD panel; An LCD driving IC for operating the LCD panel; A chassis formed on the LCD panel to prevent separation of the LCD panel and the LCD driving IC; A predetermined storage space is formed, and a mold frame in which the LCD panel is disposed; And a buffer pad for preventing cracking of the LCD panel due to external impact. The method of claim 7, wherein And the buffer pad is formed between the LCD panel and the mold frame. The method of claim 8, The buffer pad has a thickness of 0.1 to 0.3 mm. The method of claim 8, The buffer pad is made of a compound including a polyurethane. The method of claim 7, wherein And a buffer pad for preventing a crack of the LCD driving IC due to an external impact. The method of claim 11, And the buffer pad is formed to cover the LCD driving IC.

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