KR20050064386A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device for preventing static electricity, wherein the liquid crystal display device of the present invention is composed of a first and second substrates and a liquid crystal layer filled in the cell-gap bonded to face each other to maintain a constant cell-gap. A liquid crystal panel; Polarizing plates provided on both sides of the liquid crystal panel; A conductive pattern formed on at least one edge region of the upper surface of the polarizer; A mold frame supporting a lower portion of the liquid crystal panel; A lower cover supporting a lower portion of the mold frame; An upper case which is pressed onto the polarizing plate and coupled to a side of the mold frame; By including an adhesive tape electrically connected to the conductive pattern and electrically connected to the upper case, external static electricity flows into the driving unit of the liquid crystal display device to prevent the driving unit from malfunctioning, and malfunction of the driving unit. As a result, the image quality of the liquid crystal display device can be prevented from being lowered.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a liquid crystal display (Liquid Crystal Display), and more particularly to a liquid crystal display for preventing static electricity.

In general, a liquid crystal display is a thin film transistor array substrate and a color filter substrate facing each other are bonded to each other at regular intervals, and between the thin film transistor array substrate and the color filter substrate. And a driving unit for driving the liquid crystal panel.

In the thin film transistor array substrate, a plurality of gate lines arranged to be uniformly spaced laterally and a plurality of data lines arranged to be vertically spaced apart intersect each other, and the gate line and the data are intersected with each other. Pixels are defined in regions where lines intersect. The pixels are individually provided with a switching device such as a thin film transistor (TFT), and the switching device is electrically connected to the data line and the gate line.

In addition, red, green, and blue color filters are formed at positions corresponding to the pixels on the color filter substrate, and black is formed to surround the outer edges of the color filters to prevent color interference of light passing through the pixels. A matrix is formed. A common electrode for applying an electric field to the liquid crystal is formed by the voltage difference between the pixel electrodes of the thin film transistor array substrate.

The driver may include a timing controller which receives external image information, a control signal, and a power source, converts the signals into signals suitable for driving the liquid crystal display, and outputs the data controller, which receives image information from the time controller; And a gate driver configured to receive a control signal and a driving voltage from the time controller.

The liquid crystal display as described above will be described in detail with reference to the accompanying drawings.

The general structure of the liquid crystal display as described above will be described in detail with reference to the accompanying drawings.

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

Referring to FIG. 1, a liquid crystal display device includes a liquid crystal panel 10 in which pixels are arranged in a matrix form; A gate driver 20 and a data driver 30 connected to side surfaces of the liquid crystal panel 10, respectively; The backlight unit 40 is disposed on the rear surface of the liquid crystal panel 10.

The liquid crystal panel 10 includes a thin film transistor array substrate and a color filter substrate which are bonded to face each other to maintain a uniform cell-gap, and a liquid crystal layer formed at a spaced interval between the color filter substrate and the thin film transistor array substrate.

A common electrode and a pixel electrode are formed in the liquid crystal panel where the thin film transistor array substrate and the color filter substrate are bonded to apply an electric field to the liquid crystal layer.

Therefore, when the voltage of the data signal applied to the pixel electrode is controlled while the voltage is applied to the common electrode, the liquid crystal of the liquid crystal layer rotates by dielectric anisotropy according to the electric field between the common electrode and the pixel electrode. For example, characters or images are displayed by transmitting or blocking light for each pixel.

In addition, switching elements such as thin film transistors are individually provided in the pixels in order to control the voltage of the data signal applied to the pixel electrode for each pixel.

The gate driver 20 and the data driver 30 are combined with the liquid crystal panel 10 in various forms to supply scan signals and image information to gate lines and data lines formed in the liquid crystal panel 10, thereby providing liquid crystals. The pixels of the panel 10 are driven.

The backlight unit 40 may include a light guide plate 41 disposed on a rear surface of the liquid crystal panel 10; A plurality of lamps 42 disposed on both side surfaces of the light guide plate 41; The light guide plate 41 includes a reflective plate 44 disposed on a rear surface of the light guide plate 41, and an optical sheet 45 is disposed between the liquid crystal panel 10 and the light guide plate 41.

The light generated by the lamp 42 is incident on the side surface of the light guide plate 41 formed of a transparent material.

The reflector plate 44 disposed on the rear surface of the light guide plate 41 reflects the light transmitted to the rear surface of the light guide plate 41 to the upper surface of the light guide plate 41 to reduce the loss of light and is transmitted to the upper surface of the light guide plate 41. Improves light uniformity

Therefore, the light guide plate 41 transmits the light generated by the lamp 42 together with the reflecting plate 44 to the upper surface.

In the optical sheet 45 disposed between the liquid crystal panel 10 and the light guide plate 41, a diffusion sheet and a prism sheet may be applied, and a protective sheet may be added.

The diffusion sheet disperses the light incident from the light guide plate 41 to prevent the light from being partially concentrated, thereby preventing stains from occurring in the image displayed on the liquid crystal panel 10, and the angle of the light incident from the light guide plate 41. Refract vertically.

The prism sheet collects light incident from the diffusion sheet to be uniformly distributed on the entire surface of the liquid crystal panel 10.

The protective sheet protects the optical sheet 45 sensitive to dust and scratches, prevents the optical sheet 45 from flowing when the backlight unit 40 is transported, and diffuses light incident from the prism sheet. It can have a function to make the light more uniformly distributed.

On the other hand, the backlight unit 40 has an edge method provided with lamps 42 on both sides of the light guide plate 41, but an edge method provided with a lamp may be applied only to one side of the light guide plate 41, or The direct method in which the lamp is disposed to correspond to the entire rear surface of the liquid crystal panel 10 may be applied.

The liquid crystal panel 10 and the backlight unit 40 are stacked on the main support 50, and the side surfaces of the stacked liquid crystal panel 10 and the backlight unit 40 are supported by the main support 50.

The upper edge of the liquid crystal panel 10 is compressed by the upper case 51, and the upper case 51 is coupled to the main support 50.

The liquid crystal panel 10 and the backlight unit 40 are supported by a lower cover 52 disposed on the rear surface of the backlight unit 40, and the lower cover 52 is coupled to the upper case 51.

The data driver 30 includes a printed circuit board 31, and the printed circuit board 31 includes integrated circuit chips for generating various electrical signals for driving pixels of the liquid crystal panel 10, and the electrical circuit board 31. Wires for transmitting signals are connected to the liquid crystal panel 10 through a flexible conductive film (Tape Carrier Package, TCP, 32).

As described above, the liquid crystal display includes various circuits for driving the liquid crystal panel, that is, a data driver, a gate driver, and a printed circuit board. Therefore, when the circuits malfunction, an image may or may not be displayed on the liquid crystal panel. The cause of malfunction of such circuits may be internal factors such as poor contact between electrical elements and poor assembly.However, a momentary voltage increase caused by external static electricity is applied to the circuits to destroy the circuit. Can cause great damage.

Many attempts have been made to minimize the damage of the liquid crystal display device due to the static electricity.

On the other hand, in the structure of the liquid crystal display device, the liquid crystal panel is pressed and fixed by the upper case. That is, the liquid crystal panel and the upper case are in contact with each other, and more precisely, the polarizing plate provided on the upper portion of the liquid crystal panel is in contact with the upper case. However, minute gaps are actually present in the adhesive region of the polarizing plate and the upper case, and the polarizing plate and the upper case are not closely adhered to each other due to these gaps.

Therefore, when static electricity is generated from the outside and the static electricity is introduced through the polarizing plate, part of the static electricity introduced into the polarizing plate is grounded through the upper case in contact with the polarizing plate, but part of the polarizing plate and the upper case Degradation of the gate driver and the data driver, which are introduced at minute intervals and electrically connected to the liquid crystal panel, may cause a malfunction of the driver, resulting in poor image quality of the liquid crystal display.

Accordingly, the present invention has been made to solve the conventional problems as described above, the object of the present invention is to conduct a conductive treatment to the polarizing plate to ground the static electricity introduced from the outside, damage of the drive unit by the static electricity and operation of the drive unit It is an object of the present invention to provide a liquid crystal display device for preventing image quality defects caused by the above.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel including first and second substrates bonded to each other so that a constant cell gap is maintained and a liquid crystal layer filled in the cell gap; Polarizing plates provided on both sides of the liquid crystal panel; A conductive pattern formed on at least one edge region of the upper surface of the polarizer; A mold frame supporting a lower portion of the liquid crystal panel; A lower cover supporting a lower portion of the mold frame; An upper case which is pressed onto the polarizing plate and coupled to a side of the mold frame; The adhesive tape is electrically connected to the conductive pattern and electrically connected to the upper case.

2 is an enlarged view of a portion of a liquid crystal display device according to an exemplary embodiment of the present invention to show a conductive polarizing plate.

Referring to FIG. 2, the liquid crystal display device is laminated on the first substrate 111 and the second substrate 112 and the second substrate 112 bonded to each other to maintain a constant cell gap. It comprises a polarizing plate 115 for polarizing the light passing through the second substrate 112, and a drive unit electrically connected to the first substrate 111.

The liquid crystal panel is manufactured by bonding the first substrate 111 and the second substrate 112 to each other and filling the liquid crystal layer in the bonded cell-gap. Polarizing plates 115 are attached to both surfaces of the liquid crystal panel to polarize and pass the vibration direction of light supplied from the backlight unit provided on the rear surface of the liquid crystal panel in one direction.

The driving circuit 160 is mounted on the flexible conductive film 132 and electrically connected to the printed circuit board 131 and the first substrate 111, and has a gate line (not shown) through the first substrate 111. ) And a data line (not shown). In addition, the driving circuit 160 receives a control signal, a driving voltage, and image information from the printed circuit board 131 and applies it to the gate line and the data line.

The driving unit is collectively expressed as the driving circuit 160 and the printed circuit board 131.

On the other hand, the edge of the upper surface of the polarizing plate 115 is charged, the conductive pattern 120 is formed by using indium tin oxide (ITO), antimony tin oxide (ATO), and the like, which are conductive materials. Although not shown, the conductive pattern 120 and the lower cover (not shown) or the upper case (not shown) are electrically connected to ground. That is, by applying a conductive material such as ITO or ATO to one side of the upper surface of the polarizing plate 115, the static electricity flowing into the polarizing plate 115 from the outside is collected through the conductive pattern 120, the collected static electricity is the conductive It is grounded through the upper case or the lower cover in electrical contact with the pattern 120.

Therefore, the static electricity flowing through the polarizing plate 115 flows to the driving circuit 132 connected to the first substrate 111 and the printed circuit board 132 connected to the driving circuit 132 and damages the circuit. Or a damaged circuit prevents the liquid crystal display device from malfunctioning and causing poor image quality.

The ground connection of the conductive pattern 120 is shown in FIG.

3 is a cross-sectional view of a liquid crystal display device having a conductive pattern according to the present invention.

As shown in the figure, a liquid crystal panel 205 including a first substrate 205b and a second substrate 205a and a liquid crystal layer (not shown) filled therebetween, and on both sides of the liquid crystal panel 205. And a polarizing plate 207 polarizing light supplied from the rear surface of the liquid crystal panel 205 in one direction, a conductive pattern 220 formed on the polarizing plate 207 to collect static electricity, and the liquid crystal panel 205. A mold frame (215) for supporting a lower surface of the bottom surface, a bottom cover (217) for supporting and protecting a lower portion of the mold frame (215), and the polarizing plate (207). It is configured to include a top case (219) is fastened to the side of the (215).

A light guide plate 208 for emitting light supplied from a backlight unit (not shown) to the lower portion of the liquid crystal panel 205 and a light traveling toward the rear surface of the light guide plate 208 are reflected to the upper surface of the light guide plate 208. The reflective plate 209, an optical sheet 211 for diffusing and condensing light emitted from the light guide plate 208, and incident to the upper portion thereof, and a protective sheet 212 for protecting the upper portion of the optical sheet 211 are provided.

The polarizers 207 are attached to each of both sides of the liquid crystal panel 205, and the pattern directions of the polarizers 207 are disposed perpendicular to each other to vibrate in different directions to block the wavelength of incident light.

A conductive pattern 220 coated with a conductive material such as ITO or ATO is formed on the upper surface of the polarizer 207. Since the conductive pattern 220 is formed in the edge region of the polarizing plate 207 covered by the upper case 219 compressing the polarizing plate 207 from the top, the conductive pattern 220 cannot be seen from the outside, and the liquid crystal The panel 205 is located in the outer region of the image display unit (not shown) where the image is actually displayed, so that the image display is not disturbed.

The conductive pattern 220 as described above collects static electricity introduced into the upper surface of the polarizer 207 from the outside. That is, since the polarizing plate 207 is made of a non-metallic material having no conductive property, when external static electricity flows into the upper surface of the polarizing plate 207, the introduced static electricity is induced in the conductive pattern 220 to provide ground. It is emitted to the outside through this ground connection will be described in detail in FIG.

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

In FIG. 4, since the configuration overlaps with that of FIG. 3, the description of the overlapping portion in the configuration will be omitted, and the feature will be described intensively.

As shown in the figure, a liquid crystal panel 305 having a constant cell-gap opposite to each other, a polarizing plate 307 provided on both sides of the liquid crystal panel 305, and an upper edge region of the polarizing plate 307, respectively. A conductive pattern 320 formed, a mold frame 315 supporting a lower portion of the liquid crystal panel 305, a lower cover 317 supporting a lower portion of the mold frame 315, and the polarizing plate 307. The upper case 319 and the upper case 319 coupled to the side of the mold frame 315, the electrical contact with the upper portion of the conductive pattern 320, and the upper case 319 or the mold frame 315 is electrically It is configured to include an adhesive tape 350 in contact with.

The conductive pattern 320 is formed on the polarizing plate 307 provided on the upper surface of the liquid crystal panel 305, and a part of the static electricity flowing into the upper surface of the polarizing plate 307 is discharged through the upper case 319. Is introduced between the polarizing plate 307 and the upper case 319 is blocked by the conductive pattern 320 is grounded through the conductive pattern 320.

The adhesive tape 350 is adhered to the conductive pattern 320 and is also bonded to the upper case 319 or the lower cover 317. The adhesive tape 350 is usually made of a conductive copper (Cu) or aluminum (Al) material, the upper case 319 and the mold frame 315 is made of a conductive metal material, so the adhesive The conductive pattern 320 and the upper case 319 or the lower cover 317 bonded by the tape 350 are electrically connected to each other. Therefore, the static electricity induced by the conductive pattern 320 is grounded to the upper case 319 and the lower cover 317 through the adhesive tape 350.

Therefore, the static electricity introduced through the polarizing plate 307 may be prevented from entering the driving unit and damaging the driving unit, and the image quality of the liquid crystal display may be prevented by malfunction of the driving unit due to the static electricity.

Meanwhile, the adhesive tape 350 may be electrically connected to the upper case 319 or may be simultaneously connected to the upper case 319 and the lower cover 317 to increase the grounding effect.

In addition, the conductive pattern 320 may be formed in only one edge region of the polarizer 307, or may be formed in two or more edge regions.

As described above, the liquid crystal display according to the present invention forms a conductive pattern on the polarizing plate and grounds the conductive pattern with the upper case or the mold frame, thereby preventing the driving unit from being damaged by the static electricity flowing through the polarizing plate. In addition, it is possible to prevent the image quality of the liquid crystal display device from deteriorating due to a malfunction of the driving unit.

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

2 is an enlarged view of a portion of a liquid crystal display device according to an exemplary embodiment of the present invention to show a conductive polarizer.

3 is a cross-sectional view of a liquid crystal display device having a conductive pattern according to the present invention.

4 is a cross-sectional view of a liquid crystal display device according to the present invention;

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

305a: second substrate 305b: first substrate

307: polarizer 308: light guide plate

309: reflector 310: diffuser

312: protective sheet 315: mold frame

317: lower cover 319: upper case

320: conductive pattern 350: adhesive tape

Claims (7)

A liquid crystal panel comprising first and second substrates bonded to face each other so that a constant cell gap is maintained and a liquid crystal layer filled in the cell gap; Polarizing plates provided on both sides of the liquid crystal panel; A conductive pattern formed on at least one edge region of the upper surface of the polarizer; A mold frame supporting a lower portion of the liquid crystal panel; A lower cover supporting a lower portion of the mold frame; An upper case which is pressed onto the polarizing plate and coupled to a side of the mold frame; And an adhesive tape in contact with the conductive pattern and in contact with the upper case. The liquid crystal display device of claim 1, wherein the conductive pattern is formed by coating a conductive material. The liquid crystal display device according to claim 2, wherein the conductive pattern is made of indium tin oxide (ITO) or antimony titanium oxide (ATO). The liquid crystal display of claim 1, wherein the adhesive tape is formed of a conductive material. The liquid crystal display of claim 4, wherein the adhesive tape is made of copper (Cu) or aluminum (Al). The liquid crystal display of claim 1, wherein the adhesive tape is in contact with the lower cover. The liquid crystal display of claim 1, wherein the conductive pattern is covered by the upper case.