KR101787745B1 - Liquid Crystal Display device - Google Patents

Abstract

A liquid crystal display device is disclosed.
A liquid crystal display according to an embodiment of the present invention includes a liquid crystal display panel having a circular structure and divided into a display region for displaying an image and a non-display region for displaying no image, a gate driver for driving the plurality of gate lines, And a data driver for driving a plurality of data lines, wherein edge portions of the display region are formed of curved surfaces having different curvatures by the liquid crystal display panel of the circular structure, and pixels arranged according to the curvature have common electrodes having different gaps .

Description

[0001] The present invention relates to a liquid crystal display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of improving the reliability of a product by minimizing step defects occurring in a marginal portion of a display area in a non-square liquid crystal display device.

2. Description of the Related Art A display device used for a computer monitor or a TV includes an organic light emitting display (OLED), a field emission display (FED), a plasma display (PDP) And a liquid crystal display device (LCD) that can not emit light by itself and requires a light source.

Generally, a liquid crystal display device includes two substrates provided with electric field generating electrodes and a liquid crystal layer having a dielectric anisotropy formed therebetween. 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.

The liquid crystal display device includes a data driver for receiving image data from the outside and generating and supplying a data signal of a corresponding pixel to a data line of the liquid crystal display panel and a gate driver for driving pixels of the liquid crystal display panel by one line And a backlight unit disposed on a back surface of the liquid crystal display panel and providing light.

In recent years, light emitting diodes having advantages such as light efficiency, thinness, and low power consumption have been widely used as light sources for backlight units. Generally, a small liquid crystal display device has a rectangular display screen. Therefore, the shape of the liquid crystal display panel also has a rectangular shape.

2. Description of the Related Art In recent years, a liquid crystal display device has been used as a display device of various fields such as a clock or an instrument panel of a vehicle, and a circular display screen has been required.

In the liquid crystal display device having such a circular structure, a display area for displaying a screen and a non-display area for not displaying the screen are also formed in a circular shape. At this time, pixels having the same size in a rectangular shape are arranged in a matrix form in the display area to form a circular structure.

Since the number of pixels of the same size arranged in a matrix form for each line in a circular structure liquid crystal display device does not change linearly on a line-by-line basis, the pixel arrangement is arranged not in a regular manner in a stepwise manner, A step-like defect occurs.

The step-like defects can be sufficiently visually confirmed by the user, thereby deteriorating the reliability of the product.

The present invention relates to a liquid crystal display device capable of improving the reliability of a product by minimizing step defects by differently controlling the interval of the common electrodes included in the pixels located at the boundary between the display area and the non- And a display device.

A liquid crystal display panel according to an embodiment of the present invention is divided into a display area for displaying an image and a non-display area for not displaying an image, the liquid crystal display panel having a circular structure, And a data driver for driving the plurality of data lines, the edge of the display area being formed by a curved surface having a different curvature by the liquid crystal display panel of the circular structure, And includes a plurality of different common electrodes.

The liquid crystal display according to the present invention minimizes step defects generated at the edge portion by adjusting the interval of the common electrodes included in the pixels disposed at the edge portion of the display region differently according to the curvature So that the reliability of the product can be improved.

1 is a view illustrating a liquid crystal display device according to an embodiment of the present invention.
2 is a plan view schematically showing the liquid crystal display panel of FIG.
3 (A) is a detailed view of I in Fig. 2, and Fig. 3 (B) is a view showing pixels in an edge portion of Fig. 3 (A).

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.

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

1, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal display panel 210 on which an image is displayed, a liquid crystal display panel 210 disposed on a back surface of the liquid crystal display panel 210, And a backlight unit 220 for providing light.

On the upper and lower surfaces of the liquid crystal display panel 210, an upper polarizer 101 and a lower polarizer 102 having optical axes orthogonal to each other are attached.

The liquid crystal display panel 210 includes a thin film transistor array substrate, a color filter substrate which is disposed opposite to the thin film transistor array substrate, and a liquid crystal layer formed between the two substrates.

The thin film transistor array substrate includes a plurality of pixels arranged in a matrix, and each of the plurality of pixels includes a gate line extending in a first direction and a gate line extending in a second direction orthogonal to the first direction, And intersecting data lines and pixel electrodes. In addition, a thin film transistor (TFT) is formed in each pixel and connected to the gate line, the data line, and the pixel electrode.

RGB pixels, which are color filters, are formed on the color filter substrate by a thin film process, and common electrodes facing the pixel electrodes are formed. Accordingly, the liquid crystal layer is arranged by voltages applied to the pixel electrodes and the common electrode, thereby adjusting the transmittance of light provided from the backlight unit 220. [

The liquid crystal display panel 210 has a circular shape with respect to the display surface and a rectangular structure protruding from one side.

The backlight unit 220 located below the liquid crystal display panel 210 includes a support main body 280 formed of a mold having an opened upper surface and a light source unit 250 disposed at one side of the support main body 280, A light guide plate 260 disposed in parallel with the light source unit 250 and optical sheets 230 disposed on the light guide plate 260.

The optical sheets 230 diffuse and condense the light incident from the light guide plate 260 and emit the light toward the liquid crystal display panel 210. The optical sheets 230 have a rounded shape.

The light guide plate 260 converts the light emitted from the light source unit 250 disposed at one side of the support main 280 into a light spot and transmits the light to the liquid crystal display panel 210 in the direction of the liquid crystal display panel 210 Guide. At this time, the light guide plate 260 has a circular shape as a whole.

The light source unit 250 includes a flexible printed circuit board (FPC) 253 and a plurality of light emitting diodes 251 mounted on the lower surface of the flexible circuit board 253. The flexible circuit board 253 is a circuit board on which a complicated circuit is formed on a flexible insulating film, and is a substrate using a heat resistant plastic film such as PET (Polymer) or PI (Polyimide) which is a flexible material.

The support main 28 is made of a mold having an opened top surface, and all regions except the region corresponding to the light source unit 250 are circular.

The support main body 280 accommodates the light guide plate 260, the optical sheets 230 and the light source 250, and the support main body 280 corresponding to the light source unit 250 has a plurality A plurality of receiving grooves 251a for receiving the light emitting diodes 251 are formed.

A light shielding tape 200 is provided on the backlight unit 220 having such a structure.

The light shielding tape 200 corresponds to a region of the backlight unit 220 corresponding to the light source unit 250 and an edge of the support main body 280 and the optical sheets 230 and the light source unit 250 And is fixed to the support main body 280.

The light shielding tape 200 has a function of fixing the backlight unit 220 and the liquid crystal display panel 210 by applying an adhesive to both sides thereof and is composed entirely of black so that light emitted from the backlight unit 220 Prevent leaking to the outside.

A lower polarizer 102 is attached to the lower surface of the liquid crystal display panel 210 to transmit only a specific light among the light incident from the backlight unit 220. An upper polarizer 101 is attached to the upper surface of the liquid crystal display panel 210 to transmit only specific light among the light traveling upward in the liquid crystal display panel 210.

The liquid crystal display panel 210 is divided into a display area for displaying an image and a non-display area where the display area is located at the edge and the image is not displayed. A gate driver for providing a scan signal to the gate line of the liquid crystal display panel 210 may be located in the non-display area.

2 is a plan view schematically showing the liquid crystal display panel of FIG.

1 and 2, the liquid crystal display panel 210 includes a display region 201 in which an image is displayed, a non-display region 203 located at an edge of the display region 201 and in which no image is displayed ).

A plurality of pixels are arranged in the non-display area 203 in the same manner as the display area 201. In particular, a plurality of pixels are arranged in an edge portion, which is a boundary portion between the display region 201 and the non-display region 203.

The pixels include a pixel electrode to which a data voltage supplied to a data line of the liquid crystal display panel (210 of FIG. 1) is supplied, and a common electrode facing the pixel electrode. For example, when the liquid crystal display panel 210 is in the IPS mode, the pixel electrode and the common electrode are formed on the thin film transistor array substrate of the liquid crystal display panel 210.

Each of the pixels adjusts the transmittance of light by the data voltage provided to the pixel electrode and the transverse electric field generated by the common voltage provided to the common electrode.

The common electrodes included in the pixels disposed in the display region 201 are spaced apart from each other by a predetermined distance. On the other hand, the common electrodes provided in the pixels located in the non-display area 203 have different intervals according to the curvature of the edge portion.

3 (A) is a detailed view of I in Fig. 2, and Fig. 3 (B) is a view showing pixels in an edge portion of Fig. 3 (A).

As shown in FIG. 3A, a plurality of pixels are arranged at an edge portion which is a boundary portion between a display region (201 in FIG. 2) and a non-display region (203 in FIG. 2). The plurality of pixels arranged at the edge portion include a common electrode and a pixel electrode, respectively. At this time, the intervals between the common electrodes provided in the pixels disposed at the edge portion are different from each other.

For example, the pixels disposed at the edge portion may be divided into first to third pixels (pixel1 to pixel3) as shown in FIG. 3 (B).

The first pixel pixel1 includes a pixel electrode 350 and a plurality of first common electrodes 300a spaced apart from the pixel electrode 350 by a predetermined distance. The interval between the first common electrodes 300a is a.

The second pixel pixel2 includes a pixel electrode 350 and a plurality of second common electrodes 300b spaced apart from the pixel electrode 350 by a predetermined distance. The interval between the second common electrodes 300b is b.

The third pixel (pixel3) includes a pixel electrode 350 and a plurality of third common electrodes 300c spaced apart from the pixel electrode 350 by a predetermined distance. The interval between the third common electrodes 300c is c. At this time, a to c have different lengths from each other.

The interval a of the first common electrodes 300a included in the first pixel pixel1 is greater than the interval a between the second and third common electrodes 300b and 300b included in the second and third pixels pixel2 and pixel3, 300c, respectively. The interval b of the second common electrodes 300b included in the second pixel pixel2 is narrower than the interval c of the third common electrodes 300c included in the third pixel pixel3 , And the interval c of the third common electrodes 300c included in the third pixel (pixel3) is the widest.

As the distance between the common electrodes included in the pixel is larger, the transmittance of light increases. Therefore, the third pixel (pixel3) having the largest gap c between the common electrodes 300c increases the light transmittance of the first and second pixels pixel1 and pixel2.

If a third pixel (pixel 3) having a high light transmittance is appropriately disposed at a portion where a step failure phenomenon occurs at the edge portion, the gray scale level of the portion where the third pixel (pixel 3) is disposed is changed, The defective phenomenon can be minimized. That is, if the third pixel (pixel 3) having the high light transmittance is disposed at an edge portion corresponding to a region having a small curvature, the gray scale level of the portion where the third pixel (pixel 3) The phenomenon can be minimized.

The common electrodes provided in the first to third pixels (pixel1 to pixel3) may be adjusted so that the interval between the common electrodes and the height (or length) of the common electrode are 8 m. That is, if the interval of the first common electrodes 300a provided in the first pixel is 2.5 占 퐉, the height of the first common electrode 300a itself may be adjusted to 5.5 占 퐉.

Also, if the interval between the second common electrodes 300b provided on the second pixel (pixel2) is 3.5 占 퐉, the height of the second common electrode 300b itself may be adjusted to be 4.5 占 퐉. Similarly, if the interval of the third common electrodes 300c provided on the third pixel (pixel3) is 4.5 占 퐉, the height of the common electrode 300c itself may be adjusted to be 3.5 占 퐉.

When the intervals of the common electrodes provided in the pixels arranged in the dege part are differently controlled, the transmittance of the light of the corresponding pixels is different, so that the gray scale level of the edge part is adjusted, edge defects generated in the edge portion can be minimized.

101: Upper polarizer 102: Lower polarizer
200: Shading tape 201: Display area
203: non-display area 210: liquid crystal display panel
215: Black matrix 220: Backlight unit
230: optical sheet 250: light source unit
251: light emitting diode 251a: receiving groove
253: flexible circuit board 260: light guide plate
280: Support main 350: Pixel electrode
300a to 300c: first to third common electrodes

Claims (11)

A liquid crystal display device comprising a liquid crystal display panel formed of a circular structure and divided into a display area for displaying an image and a non-display area for not displaying an image,
Wherein the liquid crystal display panel includes a gate driver for driving a plurality of gate lines and a data driver for driving a plurality of data lines,
Wherein the liquid crystal display panel is an IPS mode or an FFS mode, and each of the pixels disposed in the display area includes common electrodes of equal spacing in each of the pixels,
The edge of the display region is formed of a curved surface having a different curvature by the liquid crystal display panel of the circular structure, and the pixels arranged at the edge of the display region according to the curvature are arranged at equal intervals in each pixel, Wherein the common electrodes in adjacent pixels disposed at the edge of the display region are arranged to be spaced apart from each other in the direction from the display region toward the non-display region. The method according to claim 1,
Wherein the common electrode is formed to have a different interval and height according to the curvature of the edge of the display region. delete 3. The method of claim 2,
Wherein the common electrode is adjusted differently according to the curvature so that the sum of the height of the common electrode and the gap between the common electrode and the adjacent common electrode is 8 mu m. 3. The method of claim 2,
And the transmittance of light increases as the distance between the common electrodes included in the pixels increases. 3. The method of claim 2,
A first pixel, a second pixel, and a third pixel disposed at an edge of the display region. The method according to claim 6,
Wherein the first common electrode includes first common electrodes disposed at the first pixel, second common electrodes disposed at the second pixel, and third common electrodes disposed at the third pixel. 8. The method of claim 7,
Wherein the interval of the first common electrodes is narrower than the interval of the second common electrodes, and the interval of the second common electrodes is narrower than the interval of the third common electrodes. 8. The method of claim 7,
Wherein a height of the first common electrodes is higher than a height of the second common electrodes, and a height of the second common electrodes is higher than a height of the third common electrodes. The method according to claim 6,
Wherein the light transmittance of the first pixel is lower than the light transmittance of the second pixel and the light transmittance of the second pixel is lower than the light transmittance of the third pixel. The method according to claim 6,
And a gray scale level of an image displayed in each of the first through third pixels is different according to an interval between the first through third common electrodes.

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