KR102406032B1 - In plane switching mode liquid crystal display device - Google Patents

Abstract

The present embodiments disclose a transverse electric field type liquid crystal display device. The transverse electric field type liquid crystal display device according to the disclosed embodiments includes a gate line disposed in a horizontal direction on a substrate, a data line intersecting the gate line and disposed in a vertical direction, a pixel electrode disposed in a pixel region, and a pixel electrode disposed on the pixel electrode. and a black matrix disposed in parallel with the data line and overlapping a portion of the common electrode in the disposed common electrode and at least one pixel area. Through this, a transverse electric field type liquid crystal display device having an excellent contrast ratio is provided.

Description

Horizontal electric field type liquid crystal display device {IN PLANE SWITCHING MODE LIQUID CRYSTAL DISPLAY DEVICE}

The present embodiments relate to a transverse electric field type liquid crystal display device. More specifically, it relates to a transverse electric field type liquid crystal display device having an improved contrast ratio.

With the development of information technology, the market for display devices, which is a connection medium between users and information, is growing. Accordingly, a liquid crystal display (LCD), an organic light emitting diode (OLED), a flat panel display (FPD) such as a plasma display panel (PDP) usage is increasing. Among them, a liquid crystal display capable of realizing a high resolution and capable of being miniaturized as well as enlarged is widely used.

A liquid crystal display displays an image by emitting light incident from a backlight unit by adjusting the arrangement direction of liquid crystal layers in an electric field applied to a pixel electrode and a common electrode. Among liquid crystal display devices, there is an In-Plane Switching (IPS) method in which a pixel electrode and a common electrode are disposed on a thin film transistor substrate.

A transverse electric field type liquid crystal display device includes a pixel electrode for applying an electric field to each of the liquid crystal cells, and a reference electrode, that is, a common electrode. In general, a pixel electrode has a plurality of gate lines and data lines cross-arranged on a lower substrate to define a pixel, and a thin film transistor (TFT) is provided at each intersection to correspond to the pixel electrode formed in each pixel. .

In addition, the common electrode is disposed on the lower substrate, and may be disposed below or above the pixel electrode. In addition, the pixel electrode drives the liquid crystal cell together with the common electrode according to the data signal supplied through the thin film transistor.

Here, the gate line and the data line intersect to define red (R), green (G), and blue (B) sub-pixels. The sub-pixels are provided in a vertical stripe manner sequentially arranged in the horizontal direction. Three red, green, and blue sub-pixels constitute one pixel.

Meanwhile, the common electrode may include a plurality of slits having a predetermined inclination with respect to the horizontal direction in the pixel region. Since the common electrode has a plurality of slits in the pixel region, a disclination region may be generated in the outermost portion of the slit formed in the common electrode.

For this reason, the transmittance of the transverse electric field type liquid crystal display device may be reduced, which may cause a decrease in contrast ratio (CR). Specifically, the contrast ratio is determined as a white luminance value with respect to the black luminance, and when the transmission efficiency is reduced, the white luminance may be decreased, so that the contrast ratio may be lowered.

Accordingly, there is a demand for a transverse electric field type liquid crystal display capable of solving such a problem.

The present embodiments are intended to solve the above problems, and to provide a transverse electric field type liquid crystal display capable of improving white transmission efficiency and improving contrast ratio.

In order to solve the problems of the prior art as described above, the transverse electric field type liquid crystal display device of the present embodiments includes a substrate including a plurality of sub-pixels, a gate line disposed in a horizontal direction on the substrate, and a vertical line intersecting the gate line. a data line disposed in the direction of a data line, a pixel electrode disposed in a pixel area of the sub-pixel, a common electrode disposed on the pixel electrode, and a partial area of the common electrode in at least one pixel area and disposed parallel to the data line It contains a black matrix that becomes

The black matrix may be disposed to overlap the data line or to overlap a common electrode voltage line disposed parallel to the data line.

The common electrode may include a plurality of slits having a predetermined inclination with respect to a horizontal direction in the pixel area. An end of the slit of the common electrode may be disposed to overlap the black matrix.

In addition, the black matrix includes a first black matrix disposed to overlap the data line and a second black matrix disposed to overlap other data lines adjacent to the data line, and the first black matrix and the second In the black matrix, a pixel area and an overlapping area may be different.

In addition, the black matrix includes a third black matrix disposed to overlap with another data line adjacent to the other data line, and the third black matrix and the first and second black matrices have a pixel area and an overlapping area. may be different.

In addition, the first and second black matrices constitute a first opening of a pixel region, the second and third black matrices constitute a second opening of a pixel region, and the first and third black matrices constitute a pixel A third opening of the region may be constituted. Here, the area of the first opening may be greater than the area of the third opening, and the area of the third opening may be greater than the area of the second opening.

In the transverse electric field type liquid crystal display device according to the present embodiments, the width of the opening of the pixel region is adjusted by a black matrix disposed parallel to the data line, thereby adjusting the light output amount of each sub-pixel, so that the color coordinates of the white color are adjusted. has the effect of controlling

In addition, in the transverse electric field type liquid crystal display device according to the present embodiments, a black matrix disposed parallel to the data line is disposed to overlap a partial area of the common electrode in the pixel area, so that white transmission efficiency may be improved. It works.

In addition, in the transverse electric field type liquid crystal display device according to the present embodiments, the black matrix arranged parallel to the data line is arranged to overlap with a partial region of the common electrode in the pixel region, thereby improving the contrast ratio of the transverse electric field type liquid crystal display device. can have an effect.

1 is a schematic system configuration diagram of a display device according to example embodiments.
2 is a diagram illustrating a schematic structure of a transverse electric field type liquid crystal display device according to the first embodiment.
3 is a plan view of a first sub-pixel of the transverse electric field type liquid crystal display according to the first embodiment.
4 is a cross-sectional view taken along line AB of the plan view of FIG. 3 .
5 is a plan view of a second sub-pixel of the transverse electric field type liquid crystal display according to the first embodiment.
6 is a cross-sectional view taken along the CD in the plan view of FIG. 5 .
7 is a plan view of a third sub-pixel of the transverse electric field type liquid crystal display according to the first embodiment.
FIG. 8 is a cross-sectional view taken along EF in the plan view of FIG. 7 .
9 is a diagram illustrating a schematic structure of a transverse electric field type liquid crystal display device according to a comparative example.
10 is a diagram illustrating a schematic structure of a transverse electric field type liquid crystal display device according to a second embodiment.
11 is a photograph of a pixel region of a transverse electric field type liquid crystal display according to a comparative example.
12 is a photograph of a pixel area of the transverse electric field type liquid crystal display according to the first embodiment.

Hereinafter, the present embodiments will be described in detail with reference to the drawings. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other shapes. And in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different shapes, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

Reference to an element or layer to another element or “on” or “on” includes not only directly on the other element or layer, but also with other layers or other elements interposed therebetween. do. On the other hand, reference to an element "directly on" or "directly on" indicates that there are no intervening elements or layers.

Spatially relative terms "below, beneath", "lower", "above", "upper", etc. are one element or component as shown in the drawings. and can be used to easily describe the correlation with other devices or components. The spatially relative term should be understood as a term including different directions of the device during use or operation in addition to the directions shown in the drawings. For example, when an element shown in the figures is turned over, an element described as "beneath" or "beneath" another element may be placed "above" the other element. Accordingly, the exemplary term “below” may include both directions below and above.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms.

1 is a schematic system configuration diagram of a display device according to example embodiments. Referring to FIG. 1 , in the display device 1000 according to the present exemplary embodiments, a plurality of data lines DL to DLm and a plurality of gate lines GL1 to GLn are disposed, and a plurality of sub-pixels are provided. The arranged display panel 1100, the data driver 1200 driving the plurality of data lines DL to DLm, the gate driver 1300 driving the plurality of gate lines GL1 to GLn, the data driver 1200, and and a timing controller 1400 that controls the gate driver 1300 .

The data driver 1200 drives a plurality of data lines by supplying data voltages to the plurality of data lines. In addition, the gate driver 1300 sequentially drives the plurality of gate lines by sequentially supplying scan signals to the plurality of gate lines.

Also, the timing controller 1400 controls the data driver 1200 and the gate driver 1300 by supplying control signals to the data driver 1200 and the gate driver 1300 . The timing controller 1400 starts scanning according to the timing implemented in each frame, converts the input image data input from the outside to match the data signal format used by the data driver 1200, and outputs the converted image data, , to control the data operation at an appropriate time according to the scan.

The gate driver 1300 sequentially drives the plurality of gate lines by sequentially supplying a scan signal of an on voltage or an off voltage to the plurality of gate lines under the control of the timing controller 1400 . . In addition, the gate driver 1300 may be positioned on only one side of the display panel 1100 as shown in FIG. 1 or on both sides in some cases, depending on a driving method or a display panel design method.

Also, the gate driver 1300 may include one or more gate driver integrated circuits. Each gate driver integrated circuit is connected to a bonding pad of the display panel 1100 by a tape automated bonding (TAB) method or a chip-on-glass (COG) method, or a gate in panel (GIP) type. may be implemented and disposed directly on the display panel 1100 , or may be integrated and disposed on the display panel 1100 in some cases.

In addition, each gate driver integrated circuit may be implemented in a Chip On Film (COF) method. In this case, a gate driving chip corresponding to each gate driver integrated circuit may be mounted on a flexible film, and one end of the flexible film may be bonded to the display panel 1100 .

When a specific gate line is opened, the data driver 1200 converts the image data received from the timing controller 1400 into analog data voltage and supplies it to the plurality of data lines, thereby driving the plurality of data lines. In addition, the data driver 1200 may drive a plurality of data lines including at least one source driver integrated circuit.

Each source driver integrated circuit is connected to a bonding pad of the display panel 1100 by a tape automated bonding (TAB) method or a chip-on-glass (COG) method, or directly to the display panel 1100 . It may be disposed or, in some cases, may be integrated and disposed on the display panel 1100 .

In addition, each source driver integrated circuit may be implemented in a chip on film (COF) method. In this case, the source driving chip corresponding to each source driver integrated circuit is mounted on a flexible film, one end of the flexible film is bonded to at least one source printed circuit board (Source Printed Circuit Board), and the other end is the display panel ( 1100) is bonded.

The source printed circuit board is connected to the control printed circuit board through a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit (FPC). A timing controller 1400 is disposed on the control printed circuit board.

In addition, a power controller (not shown) that supplies voltage or current to the display panel 1100 , the data driver 1200 , and the gate driver 1300 or controls the voltage or current to be supplied may be further disposed on the control printed circuit board have. The above-mentioned source printed circuit board and control printed circuit board may be a single printed circuit board.

Meanwhile, in embodiments to be described later, a pixel includes one or more subpixels. For example, one pixel may include 2 to 4 sub-pixels.

The colors defined in the sub-pixel may include red (R), green (G), blue (B), and optionally white (W), but the present exemplary embodiments are not limited thereto. However, for convenience of description, in the display device according to the present exemplary embodiments, one pixel includes three sub-pixels, and the three sub-pixels are red (R), green (G), or blue (B) sub-pixels, respectively. can be

In addition, the display device according to the present exemplary embodiments includes an advanced high-in plane switching (AH-IPS), an in-plane switching (IPS), a twist nematic (TN), and a vertical alignment (VA) type of liquid crystal display devices. It may be a transverse electric field type liquid crystal display device.

Referring to FIG. 2 , a schematic configuration of the transverse electric field type liquid crystal display according to the first embodiment will be reviewed. 2 is a diagram illustrating a schematic structure of a transverse electric field type liquid crystal display device according to the first embodiment.

Referring to FIG. 2 , the transverse electric field type liquid crystal display according to the first embodiment includes a first sub-pixel, a second sub-pixel, and a third sub-pixel.

Here, the first sub-pixel may be a red (R) sub-pixel, the second sub-pixel may be a green (G) sub-pixel, and the third sub-pixel may be a blue (B) sub-pixel. In this case, the red (R) color filter layer 410 is disposed on the first sub-pixel, the green (G) color filter layer 420 is disposed on the second sub-pixel, and the blue (B) color filter layer is disposed on the third sub-pixel 430 is disposed.

In addition, black matrices 200 , 210 , 215 , and 220 are disposed to prevent color mixing between sub-pixels defined with different colors. The black matrices 200 , 210 , 215 , and 220 may be disposed between different color filter layers 410 , 420 , 430 . Also, the black matrices 200 , 210 , and 220 may be disposed to overlap at least one color filter layer 410 , 420 , and 430 .

Meanwhile, each of the color filter layers 410 , 420 , and 430 may be surrounded by black matrices 200 , 210 , 215 and 220 on four sides on a plane. Here, the emission area of each sub-pixel may be controlled through the first black matrix 200 , the second black matrix 210 , and the third black matrix 215 arranged in the vertical direction.

Specifically, horizontal widths of the first to third black matrices 200 , 210 , and 215 may be different. For example, the horizontal width of the first black matrix 200 may be greater than the horizontal width of the second black matrix 210 . In addition, the horizontal width of the third black matrix 215 may be greater than the horizontal width of the first black matrix 200 .

That is, since the first to third black matrices 200 , 210 , and 215 have different horizontal widths, the opening area of each sub-pixel by the first to third black matrices 200 , 210 , and 215 is increased. is different, and thus, the amount of light emitted from each sub-pixel may vary.

The first black matrix 200 may be disposed between the red (R) color filter layer 410 and the green color filter layer 420 . In addition, the second black matrix 210 may be disposed between the blue (B) color filter layer 430 and the red (R) color filter layer 410 . Also, the third black matrix 215 may be disposed between the green (G) color filter layer 420 and the blue (B) color filter layer 430 .

Accordingly, the region in which the green (G) color filter layer 420 overlaps the black matrices 200, 210, 215, 220 is the widest, and the red (R) color filter layer 420 has the black matrix 200, 210, 215, 220) may be the narrowest region. That is, the first sub-pixel may have the widest opening area and the second sub-pixel may have the narrowest opening area of each sub-pixel by the first to third black matrices 200 , 210 , and 215 . Accordingly, the light output amount of the first sub-pixel may be the largest and the light output amount of the second sub-pixel may be the smallest.

Meanwhile, in FIG. 2 , the opening area is adjusted due to the first to third black matrices 200 , 210 , and 215 arranged in the horizontal direction on a plane in each pixel P including the first to third sub-pixels. , The transverse electric field type liquid crystal display device according to the first embodiment is not limited thereto, and if the opening area is adjusted by the first to third black matrices 200 , 210 , 215 in at least one pixel P, Suffice.

As described above, since the horizontal widths of the first to third black matrices 200 , 210 , and 215 arranged in the horizontal direction on a plane are different from each other, the opening area of each sub-pixel can be adjusted. Through this, the transverse electric field type liquid crystal display according to the first embodiment has an effect of easily realizing a desired white (W) color coordinate by controlling the amount of light of each sub-pixel.

Next, a plan view of the first sub-pixel of the transverse electric field type liquid crystal display according to the first embodiment will be reviewed with reference to FIG. 3 . 3 is a plan view of a first sub-pixel of the transverse electric field type liquid crystal display according to the first embodiment.

Referring to FIG. 3 , in the transverse electric field type liquid crystal display according to the first embodiment, a gate line 100 is disposed on a substrate in a horizontal direction, and a data line ( The first sub-pixel SP1 is defined by 110 .

Meanwhile, the thin film transistor Tr of the first sub-pixel SP1 includes a gate electrode 111 branched from the gate line 100 , an active layer 114 , a source electrode 112 branched from the data line 110 , and A drain electrode 113 disposed on the same layer as the source electrode 112 is included.

The drain electrode 113 of the thin film transistor Tr may be connected to the pixel electrode 135 disposed in the pixel region P through a contact hole. A common electrode 150 may be disposed on the pixel electrode 135 .

Although FIG. 3 discloses a configuration in which the pixel electrode 135 is formed in a bar shape, the shape of the pixel electrode 135 of the transverse electric field type liquid crystal display according to the first embodiment is not limited thereto, and the pixel area is not limited thereto. It may be a form provided with a plurality of slits in (P).

In addition, although FIG. 3 discloses a configuration in which the pixel electrode 135 is disposed under the common electrode 150, the pixel electrode 135 of the transverse electric field type liquid crystal display according to the first embodiment is not limited thereto. It may be disposed on the common electrode 150 .

Meanwhile, the common electrode 150 may include a first domain D1 and a second domain D2 that are symmetrical to each other in the horizontal direction. Here, the common electrode 150 may include a plurality of slits having a predetermined inclination with respect to the horizontal direction in the pixel region P.

Since the common electrode 150 includes a plurality of slits in the pixel region P, a disclination region may be generated in the outermost portion of the slits formed in the common electrode 150 . That is, a region of reduced transmission efficiency due to a lattice defect of the common electrode 150 may occur on the left and right sides of the pixel region P. As shown in FIG.

On the other hand, in the transverse electric field type liquid display device including the common electrode 150 as described above, the transmittance is reduced due to the region in which the lattice defect of the common electrode 150 occurs, thereby reducing the contrast ratio (CR). This can happen. In detail, the contrast ratio is determined as a white luminance value with respect to the black luminance, and when the transmission efficiency is reduced, the white luminance may be reduced, so that the contrast ratio may be lowered.

To solve this problem, the transverse electric field type liquid crystal display device according to the first embodiment may improve the contrast ratio by using the first black matrix 200 and the second black matrix 210 .

In detail, since the luminance of black in the transverse electric field type liquid crystal display device is the luminance when the display device is not driven, the black luminance decreases as the opening region of the pixel region P becomes smaller. Accordingly, when the luminance of white in the opening region of the pixel region P increases or the luminance of black decreases less than the decrease ratio, the contrast ratio of the lateral electric field type liquid crystal display device can be increased.

In FIG. 3 , the first black matrix 200 and the second black matrix 210 arranged in the direction of the data line 110 are included. In detail, the first black matrix 200 is disposed to overlap the data line 110 and overlap one side of the common electrode 150 in the pixel region P. More specifically, the first black matrix 200 is disposed to overlap one side of the slit of the common electrode 150 in the pixel region P.

In addition, the second black matrix 210 is disposed to overlap the data line 110 on which the first black matrix 200 overlaps and other data lines 110 adjacent to each other, and to overlap the other side of the common electrode 150 . do. In detail, the second black matrix 210 is disposed to overlap the other side of the slit of the common electrode 150 in the pixel region P. That is, the first black matrix 200 and the second black matrix 210 are disposed to overlap one side and the other side of the common electrode 150 in which the lattice defect occurs, thereby improving the contrast ratio.

In detail, a portion of the first black matrix 200 and the second black matrix 210 may be disposed up to a portion of the pixel area P. Accordingly, as the area of the first opening X of the pixel region P is reduced, black luminance is reduced accordingly.

Meanwhile, an area in which the first black matrix 200 overlaps the pixel area P may be different from an area in which the second black matrix 210 overlaps the pixel area P. In detail, an area in which the first black matrix 200 overlaps the pixel area P may be wider than an area in which the second black matrix 210 overlaps the pixel area P.

Since the first black matrix 200 and the second black matrix 210 are arranged up to the pixel region P, the area of the first opening X of the pixel region P is reduced, so that white light is emitted. area is also reduced. However, since the decrease in black luminance is greater than the decrease in white luminance due to the first black matrix 200 and the second black matrix 210 , the contrast ratio may increase as a result.

That is, in the transverse electric field type liquid crystal display according to the first embodiment, the contrast ratio can be improved through the first black matrix 200 and the second black matrix 210 arranged parallel to the data line. In addition, the transverse electric field type liquid crystal display according to the first embodiment may further include a black matrix 220 overlapping the gate line 100 .

A detailed review of such a configuration with reference to FIG. 4 is as follows. 4 is a cross-sectional view taken along line A-B of the plan view of FIG. 3 . Referring to FIG. 4 , an insulating layer 310 is disposed on the first substrate 300 . The insulating layer 310 may be a gate insulating layer 310 disposed on a gate electrode (not shown). A data line 110 is disposed on the insulating layer 310 .

Meanwhile, the data line 110 may be formed of an alloy including copper (Cu), molybdenum (Mo), aluminum (Al), silver (Ag), titanium (Ti), or a combination thereof. Meanwhile, although FIG. 4 discloses a configuration in which the data line 110 is formed of a single layer, the transverse electric field type liquid crystal display according to the first embodiment is not limited thereto, and may be formed of multiple layers.

A passivation layer 320 is disposed on the data line 110 . A pixel electrode 135 is disposed on the passivation layer 320 . The pixel electrode 135 may be formed of any one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), and ZnO.

A planarization layer 330 may be disposed on the pixel electrode 135 . In addition, a plurality of common electrodes 150 may be disposed on the planarization layer 330 to be spaced apart from each other. The common electrode 150 may be formed of any one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), and ZnO. A first alignment layer 340 may be disposed on the plurality of common electrodes 150 .

In addition, the second substrate 400 disposed to face the first substrate 100 is disposed. First and second black matrices 200 and 210 , a color filter layer 410 , an overcoat layer 250 , and a second alignment layer 460 may be disposed on one surface of the second substrate 400 . In addition, the liquid crystal 160 may be disposed between the first substrate 100 and the second substrate 400 .

The liquid crystal 160 may be disposed parallel to the rubbing direction of the first alignment layer 340 and the second alignment layer 260 . For example, as shown in FIG. 4 , the liquid crystal 160 may be horizontally arranged when the transverse electric field type liquid crystal display is in an OFF state.

Meanwhile, in the first sub-pixel SP1 , a portion of the first and second black matrices 200 and 210 may be disposed to overlap a portion of the common electrode 150 , respectively. That is, the first and second black matrices 200 and 210 may be disposed to extend to a part of the pixel area. Here, an area in which the first black matrix 200 overlaps the pixel area may be wider than an area in which the second black matrix 210 overlaps the pixel area.

In this case, the first and second black matrices 200 and 210 may extend to the pixel area in the same direction as the rubbing “?” direction of the first and second alignment layers 250 and 460 on the cross-section. Here, the first and second black matrices 200 and 210 may have different widths based on the rubbing direction. In detail, the widths of the first and second black matrices 200 and 210 extending to the pixel area in the same direction as the rubbing direction may be different. Accordingly, the area of the first opening X of the first sub-pixel SP1 may be adjusted through the first and second black matrices 200 and 210 .

The first and second black matrices 200 and 210 define the first opening X of the first sub-pixel. In the first opening X of the first sub-pixel defined by the first and second black matrices 200 and 210 , light incident from the backlight toward the first substrate 100 exits through the color filter layer 410 . can be In other words, the amount of light emitted from the first sub-pixel may be adjusted through the area of the first opening X defined by the first and second black matrices 200 and 210 .

Next, a plan view of the second sub-pixel of the transverse electric field type liquid crystal display according to the first embodiment will be reviewed with reference to FIGS. 5 and 6 . 5 is a plan view of a second sub-pixel of the transverse electric field type liquid crystal display according to the first embodiment. 6 is a cross-sectional view taken along line C-D of the plan view of FIG. 5 .

Meanwhile, the second sub-pixel of the transverse electric field type liquid crystal display according to FIGS. 5 and 6 may include the same components as those of FIGS. 3 and 4 , respectively. A description overlapping with those of FIGS. 3 and 4 described above may be omitted. Also, the same components have the same reference numerals.

In FIG. 5 , the second sub-pixel SP2 of the transverse electric field type liquid crystal display according to the first embodiment overlaps the first black matrix 200 overlapping the data line 110 and the other data line 110 . The second opening Y of the pixel area P may be defined by the third black matrix 215 . In this case, the second opening Y of the second sub-pixel SP2 may have a smaller area than the first opening X of the first sub-pixel SP1 illustrated in FIG. 3 .

In detail, an area in which the third black matrix 215 overlaps the pixel area P may be wider than an area in which the first black matrix 200 overlaps the pixel area P. That is, the first opening X shown in FIG. 3 is formed by the second black matrix 210 having a narrower area overlapping the pixel area P than the first black matrix 200 and the third black matrix 215 . As defined, the area may be larger than that of the second opening Y.

Also, in FIG. 6 , the first and third black matrices 200 and 215 may be disposed to overlap the common electrode 150 . That is, the first and third black matrices 200 and 215 may be disposed to extend to a part of the pixel area. Here, the third black matrix 215 may be disposed inside the pixel area than the first black matrix 200 .

In this case, the first and third black matrices 200 and 215 may extend to the pixel area in the same direction as the rubbing “?” direction of the first and second alignment layers 250 and 460 on the cross-section.

The first and third black matrices 200 and 215 define the second opening Y of the second sub-pixel. In the second opening Y of the second sub-pixel defined by the first and third black matrices 200 and 215 , light incident from the backlight toward the first substrate 100 exits through the color filter layer 420 . can be In other words, the amount of light emitted from the second sub-pixel may be adjusted through the area of the second opening Y defined by the first and third black matrices 200 and 215 .

Next, a plan view of the third sub-pixel of the transverse electric field type liquid crystal display according to the first embodiment will be reviewed with reference to FIGS. 7 and 8 . 7 is a plan view of a third sub-pixel of the transverse electric field type liquid crystal display according to the first embodiment. FIG. 8 is a cross-sectional view taken along line E-F of the plan view of FIG. 7 .

Meanwhile, each of the third sub-pixels of the transverse electric field type liquid crystal display according to FIGS. 7 and 8 may include the same components as those of FIGS. 3 to 6 . A description overlapping with those of FIGS. 3 to 6 described above may be omitted. Also, the same components have the same reference numerals.

In FIG. 7 , the third sub-pixel SP3 of the transverse electric field type liquid crystal display according to the first embodiment overlaps the third black matrix 215 overlapping the data line 110 and the other data line 110 . The third opening Z of the pixel region P may be defined by the second black matrix 200 .

In this case, the third opening Z of the third sub-pixel SP3 may have a smaller area than the first opening X of the first sub-pixel SP1 illustrated in FIG. 3 . Also, the third opening Z of the third sub-pixel SP3 may have a larger area than the second opening Y of the second sub-pixel SP2 illustrated in FIG. 5 .

In detail, the area of the third opening Z is defined by the second and third black matrices 210 and 215 , and thus the first opening X is defined by the first and second black matrices 200 and 210 . ) may be smaller than the area of In addition, the area of the third opening Z is defined by the second and third black matrices 210 and 215 , and thus the second opening Y is defined by the first and third black matrices 200 and 215 . may be larger than the area of

Also, in FIG. 8 , the second and third black matrices 210 and 215 may be disposed to overlap the common electrode 150 . That is, the second and third black matrices 210 and 215 may be disposed to extend to a portion of the pixel area. Here, the third black matrix 215 may be disposed inside the pixel area than the second black matrix 210 . In this case, the second and third black matrices 210 and 215 may extend in the same direction as the rubbing “? direction of the first and second alignment layers 250 and 460 on the cross-section.

The second and third black matrices 210 and 215 define the third opening Z of the third sub-pixel. In the third opening Z of the third sub-pixel defined by the second and third black matrices 210 and 215 , light incident from the backlight toward the first substrate 100 exits through the color filter layer 430 . can be In other words, the amount of light emitted from the third sub-pixel may be adjusted through the area of the third opening Z defined by the second and third black matrices 210 and 215 .

As described above, the first to third black matrices 200, 210 and 215 , the area of the opening of the pixel region P is adjusted, so that the amount of light emitted from each sub-pixel may be different. That is, by adjusting the amount of light emitted from each of the sub-pixels SP1 , SP2 , and SP3 , there is an effect that the color coordinates of the white color can be adjusted.

In addition, at the same time, since the first to third black matrices 200 , 210 , and 215 are arranged parallel to the data line 110 , the effect of improving the white transmission efficiency of the transverse electric field type liquid crystal display is improved. have.

A description will be made as follows in comparison with the transverse electric field type liquid crystal display device according to the first embodiment and the transverse electric field type liquid crystal display device according to the comparative example. 9 is a diagram illustrating a schematic structure of a transverse electric field type liquid crystal display device according to a comparative example.

Meanwhile, the transverse electric field type liquid crystal display device according to the comparative example may include the same components as the transverse electric field type liquid crystal display device according to the first embodiment. A description overlapping with the first embodiment described above may be omitted. Also, the same components have the same reference numerals.

9 is different from FIG. 2 in that all of the black matrices 220 arranged in the vertical direction on the plane have the same width. Also, in FIG. 9 , a fourth black matrix 230 is disposed to overlap the color filter layer 420 of the second sub-pixel in order to adjust the color coordinates of the white color, and the color filter layer 430 of the third sub-pixel is disposed. ), there is a difference in that the fifth black matrix 240 is arranged to overlap.

In the transverse electric field type liquid crystal display according to the comparative example, the vertical width of the fourth black matrix 230 may be wider than the vertical width of the fifth black matrix 240 . Accordingly, the first sub-pixel may have the widest opening area and the second sub-pixel may have the narrowest opening area of each sub-pixel. Accordingly, the light output amount of the first sub-pixel may be the largest and the light output amount of the second sub-pixel may be the smallest.

That is, in the transverse electric field type liquid crystal display device according to the first embodiment, the first to third black matrices are arranged parallel to the data lines, but in the display device according to the comparative example, the fourth and fifth black matrices 230 and 240 . is arranged to be parallel to the gate line. Accordingly, in the transverse electric field type liquid crystal display according to the comparative example, the black matrix is not disposed in the region corresponding to the region where the lattice defect occurs on the left and right sides of the common electrode. That is, in the transverse electric field type liquid crystal display according to the comparative example, the contrast ratio may decrease due to the decrease in transmission efficiency.

Next, a transverse electric field type liquid crystal display device according to the second embodiment will be reviewed with reference to FIG. 10 . 10 is a diagram illustrating a schematic structure of a transverse electric field type liquid crystal display device according to a second embodiment.

The transverse electric field type liquid crystal display device according to the second embodiment may include the same components as the transverse electric field type liquid crystal display device according to the first embodiment. A description overlapping with the first embodiment described above may be omitted. Also, the same components have the same reference numerals.

Referring to FIG. 10 , in the transverse electric field type liquid crystal display device according to the second embodiment, the first black matrix 200 is disposed between the red (R) color filter layer 410 and the green color filter layer 420, and the green ( G) It may be disposed between the color filter layer 420 and the blue (B) color filter layer 430 . In addition, the second black matrix 210 may be disposed between the blue (B) color filter layer 430 and the red (R) color filter layer 410 .

That is, in the transverse electric field type liquid crystal display device according to the second embodiment, two black matrices 200, 210) discloses a configuration having a different width in the horizontal direction. Through this, it is possible to solve the problem of lowering the contrast ratio caused by the common electrode 150 and to improve white luminance.

In addition, the transverse electric field type liquid crystal display device according to the second embodiment is not limited thereto, and by adjusting the positions of the black matrices 200 and 210 arranged parallel to the data line (not shown) in one pixel P, The opening area of each sub-pixel may be adjusted.

For example, a region in which the first black matrix 200 disposed between the green (G) color filter layer 420 and the blue (B) color filter layer 430 overlaps the green (G) color filter layer 420 is blue. (B) It may be wider than the area overlapping the color filter layer 430 . That is, the first black matrix 200 may be disposed to be biased toward the green (G) sub-pixel. Through such a configuration, the opening area of each sub-pixel can be adjusted.

Next, with reference to FIGS. 11 and 12 , the pixel areas of one sub-pixel of the lateral electric field type liquid crystal display according to the comparative example and the first embodiment are compared as follows. 11 is a diagram illustrating a pixel area and a black matrix of a transverse electric field type liquid crystal display according to a comparative example. 12 is a diagram illustrating a pixel area and a black matrix of the transverse electric field type liquid crystal display according to the first embodiment.

11 illustrates a case in which the black matrix is disposed in the upper and lower portions of the pixel area, that is, in the gate line direction, and FIG. 12 illustrates a case in which the black matrix is disposed in the left and right sides of the pixel area, that is, in the data line direction. In FIG. 11 , the contrast ratio may be lowered than in FIG. 12 due to a lattice defect of the common electrode on the left and right sides of the pixel area.

That is, in the transverse electric field type liquid crystal display according to the first embodiment, the contrast ratio of each sub-pixel can be improved by arranging the black matrix on the left and right of the pixel area, that is, in the direction of the data line.

Features, structures, effects, etc. described in the above-described embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are merely examples and do not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications that have not been made are possible. For example, each component specifically shown in the embodiments may be implemented by modification.

200: first black matrix
210: second black matrix
215: third black matrix
410: red color filter layer
420: green color filter layer
430: blue color filter layer

Claims (11)

a substrate including a plurality of sub-pixels;
a gate line disposed in a horizontal direction on the substrate;
a data line intersecting the gate line and disposed in a vertical direction;
a pixel electrode disposed in a pixel region of the sub-pixel;
a common electrode disposed to overlap the pixel electrode; and
a black matrix overlapping a partial area of the common electrode in at least one pixel area and disposed parallel to the data line;
The common electrode includes a first domain and a second domain that are symmetrical to each other with respect to a horizontal direction,
the common electrode includes a plurality of slits having a predetermined inclination with respect to a horizontal direction in the first domain and the second domain of the pixel region;
The slope of the slit provided in the first domain and the slope of the slit provided in the second domain are symmetrical with respect to the horizontal direction,
The black matrix is
A first black matrix disposed to overlap the data line, a second black matrix disposed to overlap another data line adjacent to the data line, and a second black matrix disposed to overlap another data line adjacent to the other data line 3 contains the black matrix,
The first and second black matrices constitute a first opening in the pixel region, the second and third black matrices constitute a second opening in the pixel region, and the first and third black matrices constitute a first opening in the pixel region. constituting a third opening,
An area of the first opening is greater than an area of the third opening, and an area of the third opening is greater than an area of the second opening.
The method of claim 1,
The black matrix is disposed to overlap the data line.
delete 3. The method of claim 2,
An end of the slit of the common electrode is disposed to overlap a black matrix.
The method of claim 1,
wherein the first black matrix and the second black matrix have different pixel areas and overlapping areas.
6. The method of claim 5,
and wherein the third black matrix and the first and second black matrices have different pixel areas and overlapping areas.
delete delete a first substrate divided into a plurality of sub-pixels;
a data line disposed on the first substrate;
an insulating layer disposed on the data line;
a plurality of common electrodes disposed on the insulating layer;
a second substrate disposed to face the first substrate; and
a black matrix disposed on one surface of the second substrate and disposed to overlap with at least one common electrode in a pixel area;
The common electrode includes a first domain and a second domain that are symmetrical to each other with respect to a horizontal direction,
the common electrode includes a plurality of slits having a predetermined inclination with respect to a horizontal direction in the first domain and the second domain of the pixel region;
The slope of the slit provided in the first domain and the slope of the slit provided in the second domain are symmetrical with respect to the horizontal direction,
The black matrix is
A first black matrix disposed to overlap the data line, a second black matrix disposed to overlap another data line adjacent to the data line, and a second black matrix disposed to overlap another data line adjacent to the other data line 3 contains the black matrix,
The first and second black matrices constitute a first opening in the pixel region, the second and third black matrices constitute a second opening in the pixel region, and the first and third black matrices constitute a first opening in the pixel region. constituting a third opening,
An area of the first opening is greater than an area of the third opening, and an area of the third opening is greater than an area of the second opening.
10. The method of claim 9,
Further comprising an alignment layer disposed on the common electrode and the black matrix,
In at least one sub-pixel, at least one black matrix is disposed to extend to a pixel area in a rubbing direction of the alignment layer.
11. The method of claim 10,
In one pixel including the plurality of sub-pixels, at least two black matrices have different widths based on the rubbing direction.

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