KR100539966B1 - Liquid crystal display - Google Patents

Abstract

A liquid crystal display device for improving aperture ratio and transmittance is disclosed. The plurality of data lines extend in a first direction and are arranged to have a predetermined interval in a second direction orthogonal to the first direction, and the plurality of gate lines extend in a second direction and have a predetermined interval in a first direction. The pixel region is surrounded by two adjacent data lines and gate lines among the plurality of data lines and the plurality of gate lines, and the common electrode line extends in the second direction in the pixel region to be parallel to the gate line. The gate line has a predetermined linear separation distance from the common electrode line. Accordingly, the gate lines may be formed in the peripheral area of the common line where the texture is generated in the same pattern as the common line, thereby reducing the aperture ratio decreasing area and improving the transmittance.

Description

Liquid Crystal Display {LIQUID CRYSTAL DISPLAY}

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

FIG. 2 is a plan view schematically illustrating the TFT substrate shown in FIG. 1.

3 is a view showing in detail one pixel of the TFT substrate shown in FIG.

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

400: gate line 410: data line

420: pixel electrode 430: common electrode line

432: capacitor electrode 434: capacitor line

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device for improving the aperture ratio and transmittance.

A liquid crystal display device is one of flat display devices that display information by liquid crystal.

The liquid crystal display includes a TFT substrate having a thin film transistor (TFT) for switching each pixel, a common electrode substrate having a common electrode, and a liquid crystal sealed between the two substrates. Here, the liquid crystal is characterized in that the arrangement is changed according to the electric field applied between the two substrates, and the transmissive index is changed in accordance with the arrangement.

As the operation mode of the liquid crystal display, a twisted nematic mode (hereinafter, referred to as a TN mode) is generally used. In the TN mode, the axial direction of the liquid crystal molecules is twisted by 90 degrees in the direction perpendicular to the substrate surface between the TFT substrate and the common electrode substrate by using a vertical electric field on the substrate surface.

Further, in the in-plane switching mode, an electric field parallel to the TFT substrate is generated, and the axial direction of the liquid crystal molecules rotates on the horizontal plane for display.

On the other hand, as a method for obtaining a wide viewing angle by an electric field parallel to a TFT substrate similar to the IPS mode, a liquid crystal display device in a vertical alignment mode has been developed. The liquid crystal display of the vertical alignment mode is a liquid crystal display using a liquid crystal that is vertically aligned with respect to two electrodes formed on two substrates.

In addition, the PVA mode (Patterned Vertical Alignemtn mode) liquid crystal display device, which is one of the liquid crystal display devices in the vertical alignment mode, patterns the transparent electrodes in a predetermined form so that the liquid crystals are arranged in different directions by the patterned transparent electrodes. Improve.

In the liquid crystal display of the PVA mode as described above, the center portion of the data line constituting one pixel is bent in a V-shape, so that two adjacent data lines and gate lines are formed. The pixel region to be defined also has a V shape. In this case, a plurality of patterned electrodes are formed in the pixel area to block a portion of the pixel area to stabilize the liquid crystal array.

In the conventional PVA mode liquid crystal display, the common electrode line and the gate line are adjacent to each other. In this case, the gate line has a straight line shape extending in a direction perpendicular to the data line.

As described above, in the conventional LCD, the pixel region and the data line have a V-shape in order to improve the aperture ratio and the transmittance, but the screen is black at the edges of the sub-pixels separated by the patterned electrodes. There is a problem in that the visible texture is generated and the transmittance is lowered.

In addition, the conventional liquid crystal display device also has a problem in that the texture is generated in the peripheral region of the common electrode line and the transmittance is lowered.

Accordingly, an object of the present invention is to provide a liquid crystal display device for improving the aperture ratio and transmittance, which is devised to solve the above-mentioned conventional problems.

A plurality of data lines of the liquid crystal display according to the present invention for achieving the above object is arranged to extend in a first direction, and to have a predetermined interval in a second direction orthogonal to the first direction, the plurality of gate lines The pixel region extends in a second direction and is arranged to have a predetermined interval in the first direction, and the pixel region is formed surrounded by two adjacent data lines and gate lines among the plurality of data lines and the plurality of gate lines, and the common electrode line. Is formed to extend in the second direction in the pixel area so as to be parallel to the gate line, and the gate line has a constant linear separation distance from the common electrode line.

In the liquid crystal display, the gate lines may be formed in the same area as the common line in the periphery of the common line where the texture is generated, thereby reducing the aperture ratio decreasing region and improving the transmittance.

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

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is a plan view schematically illustrating the TFT substrate illustrated in FIG. 1.

As shown in FIG. 1 and FIG. 2, the liquid crystal display device 100 according to an exemplary embodiment of the present invention receives an image received from the backlight assembly 200 that generates light and the light generated by the backlight assembly 200. The display unit 300 is configured to display.

The backlight assembly 200 includes a light source unit 210 for generating light and a light guide plate 220 for guiding the generated light to the display unit 300. Here, the light source unit 210 includes a lamp 212 and a lamp reflector 214 for reflecting light generated by covering one side of the lamp 212 toward the light guide plate 220.

In addition, the backlight assembly 200 may be provided under the light guide plate 220 to reflect the light leaked from the light guide plate 220 and to provide the light to the display unit 300 to reflect the light emitted from the light guide plate 220. A plurality of optical sheets 240 for uniformizing the luminance distribution.

The backlight assembly 200 and the display unit 300 are accommodated in a mold frame 250 positioned below the backlight assembly 200. In addition, the chassis 260 is provided to face the mold frame 250 to fix the display unit 300 and the backlight assembly 200 to the mold frame 250.

The display unit 300 forms a screen of the liquid crystal display device 100 to display an image, a liquid crystal display panel 310 for displaying an image, a data printed circuit board 320 for providing a data signal for displaying the image, and an image. Data for providing a data signal input from the gate printed circuit board 330 and the data printed circuit board 320 to the liquid crystal display panel 310 for each horizontal line of the liquid crystal display device 100 to provide a gate driving signal for display. The driving chip 340 and the gate driving chip 350 may sequentially provide the gate driving signal input from the gate printed circuit board 330 to the liquid crystal display panel 310.

The liquid crystal display panel 310 is provided to face the first substrate 312 and the first substrate 312 on which a TFT (not shown), which is a switching element, and a pixel electrode (not shown) are formed, and the common electrode ( And a liquid crystal (not shown) interposed between the second substrate 314 and the first substrate 312 and the second substrate 314 formed thereon. In this case, the liquid crystal has a feature of vertically aligned with respect to the two substrates.

The first substrate 312 extends in a first direction, and includes a plurality of gate lines 400 arranged to have a predetermined interval in a second direction, and a plurality of data lines 410 intersecting the gate lines 400. In addition, the plurality of pixel electrodes 420 formed in the form of a matrix are formed at the intersection of the gate line 400 and the data line 410. In addition, the first substrate 312 includes a color filter (not shown) configured by color pixels expressing a predetermined color by light provided from the backlight assembly 200.

Here, the pixel region formed by the two adjacent gate lines 400 and the data lines 410 among the plurality of gate lines 400 and the data lines 410 has a V-shape in which the center portion is bent in the layout. Has Here, a plurality of electrodes (not shown) are formed in the pixel region to block a portion of the pixel region to stabilize the arrangement of liquid crystal molecules.

In addition, the data line 410 has a V shape corresponding to one pixel area, and has a zigzag shape in which the V shape is repeated in the second direction.

The common electrode line 430 is formed in the region adjacent to the gate line 400 to maintain the signal voltage applied to the pixel electrode 420 for a predetermined time until the next signal voltage is applied.

As shown in FIG. 3, the common electrode line 430 includes a capacitor electrode 432 having a rhombus shape and a capacitor line 434 extending from both vertices of the capacitor electrode 432.

In addition, the gate line 400 is formed to have the same pattern as the common electrode line 430. That is, the gate line 400 is formed to be parallel to the capacitor line 434, and is bent in a region corresponding to the capacitor electrode 432 to have a V shape.

The shapes of the common electrode line 430 and the gate line 400 will be described in more detail with reference to FIG. 3.

3 is a view showing in detail one pixel of the TFT substrate shown in FIG.

As illustrated in FIG. 3, a pixel electrode 420, a common electrode line 430, and a TFT 440 are formed in a pixel region defined by two adjacent data lines 410 and a gate line 400. .

The TFT 440 includes a gate electrode 442, a source electrode 444, and a drain electrode 446, and the gate electrode 442 is connected to the gate line 400, and the source electrode 444 is a data line. The drain electrode 446 is connected to the pixel electrode 420.

In addition, the common electrode line 430 extends in a first direction from a capacitor electrode 432 having a predetermined width and a first vertex of the rhombus and a second vertex facing the first vertex. Line 434.

The gate line 410 is formed to have a shape corresponding to the outer line of the common electrode line 430 adjacent to the common electrode line 430. That is, the gate line 400 is formed such that a region corresponding to the third vertex of the capacitor electrode 432 is bent to have a V shape, and both ends of the gate line 400 extend in the first direction to be parallel to the capacitor line 434. .

Here, the common electrode line 430 becomes the lower electrode of the storage capacitor Cst, and the pixel electrode 420 in the region facing the common electrode line 430 becomes the upper electrode of the storage capacitor.

As such, the structure in which the common electrode line 430 includes a rhombic capacitor electrode 432 and a capacitor line 434 extending with a predetermined thickness at the first and second vertices increases the storage capacitor and simultaneously increases the aperture ratio. To improve the quality.

In general, the liquid crystal display of the PVA mode does not show the transmission efficiency as much as the center part because a texture that looks black is generated at the edge part of the pixel area. In addition, texture is also generated in the sub pixel areas formed by the common electrode line 430 and the gate line 400, thereby reducing the transmission efficiency.

Therefore, in the present invention, as the gate line 400 is formed to have the same pattern as the common electrode line 430 in the region where the texture is generated and the transmission efficiency is reduced, the aperture ratio is increased in the region where the existing gate line is formed. Therefore, the overall transmission efficiency of the liquid crystal display device is improved.

In the above description, the present invention has been described using a PVA mode liquid crystal display in which a plurality of electrodes are formed to block a part of the pixel area to stabilize the arrangement of liquid crystals. The feature can be applied.

As described above, the gate line of the liquid crystal display according to the present invention is formed to have the same pattern as the outer line of the common electrode line. That is, the gate line is bent in an area corresponding to a predetermined vertex of the capacitor electrode of the common electrode line, and both bent ends are formed to be parallel to the capacitor line of the common electrode line.                     

Therefore, in the present invention, since the gate lines are formed to have the same pattern as the common electrode lines in the adjacent region of the common electrode line where the text is generated, the aperture ratio is improved in the region where the gate lines of the conventional linear form were formed, thereby improving the liquid crystal display device. There is an effect that can improve the overall transmission efficiency of.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (6)

 A first substrate; A plurality of data lines, a plurality of gate lines intersecting the plurality of data lines, a pixel region defined by the data lines and the gate lines, and a common extending in parallel to the gate lines in the pixel region A second substrate having electrode lines; A liquid crystal interposed between the first substrate and the second substrate; And A light generating device formed under the second substrate to provide light to the first substrate and the second substrate, The common electrode line A square capacitor electrode having a predetermined width; And A capacitor line extending in different directions on the same axis line at a first vertex of the capacitor electrode and a second vertex opposite to the first vertex, And the gate line is bent to correspond to a third vertex of the capacitor electrode adjacent to the gate line, and the bent ends are formed to extend in parallel with the capacitor line. delete delete The liquid crystal display of claim 1, wherein the liquid crystal has any one operation mode among a Tien (TN) mode, a PVA mode, and an IPS mode. The method of claim 1, wherein the pixel region is formed to have a V-shape, And the data lines have a shape corresponding to the pixel area. The liquid crystal display device according to claim 1, wherein the second substrate includes a color filter which expresses a predetermined color by the light.

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