KR101663565B1 - Liquid crystal display device - Google Patents

Abstract

The liquid crystal display of the present invention includes first and second substrates facing each other and a liquid crystal layer disposed between the first and second substrates and driven by an electric field, (N-1) -th pixel column is arranged in an n-th pixel column, and a plurality of pixels arranged in the (n-1) The aperture ratio of the first pixel located at the other end of the n-th pixel train is smaller than the second pixel of the n-th pixel train and the aperture ratio of the m-th pixel located at the other end of the n-th pixel train is smaller than the (m-1) .
According to the above structure, a liquid crystal display device having a circular display area can be provided.

Description

[0001] Liquid crystal display device [0002]

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 having a circular display area.

In recent years, as the society has become a full-fledged information age, the display field for processing and displaying a large amount of information has been rapidly developed, and as a flat panel display device having excellent performance of thinning, light weighting and low power consumption, Is replacing a conventional cathode ray tube (CRT).

Generally, the driving principle of a liquid crystal display device utilizes the optical anisotropy and polarization properties of a liquid crystal. Since the liquid crystal has a long structure, it has a directionality in the arrangement of molecules, and the direction of the molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal.

Therefore, when the molecular alignment direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular alignment direction of the liquid crystal by optical anisotropy, so that image information can be expressed.

At present, an active matrix liquid crystal display (AM-LCD: hereinafter referred to as liquid crystal display) in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner has excellent resolution and video realization capability, It is attracting attention.

1 is a schematic bottom view showing a display region of a general array substrate for a liquid crystal display device.

As shown in the figure, the array substrate for a liquid crystal display includes a plurality of pixels P and has a display area for displaying an image.

The plurality of pixels P are defined by a gate wiring 2 extending in a first direction X and a data wiring 4 extending in a second direction Y while intersecting the gate wiring 2 . Each of the plurality of pixels P includes a thin film transistor Tr connected to the gate line 2 and the data line 4 and a storage capacitor Cst and a liquid crystal capacitor Clc connected to the thin film transistor Tr. .

The plurality of pixels P are arranged in a matrix in which pixel row PR1, PR2 ... PR (m-1), PRm arranged along the first direction X and a second row Y Can be divided into pixel columns PC1, PC2, ... PC (n-1), PCn. At this time, generally, in a liquid crystal display device having a rectangular display area, the number of pixels P located in each pixel row PR1, PR2, ... PR (m-1), PRm is the same, The number of pixels P located in the columns PC1, PC2, ... PC (n-1), PCn is also the same. With this arrangement, the display area of the liquid crystal display device has a rectangular shape.

Recently, a liquid crystal display device having a circular display area has been demanded, while a liquid crystal display device has been used in various fields.

2 is a schematic view of a conventional liquid crystal display device having a circular display area.

As shown, the liquid crystal display device is divided into a circular display area DA and a non-display area NDA surrounding the display area DA.

In order to form the circular display area DA with the pixels on the square, the pixels on the edge must be arranged in a stepped shape. That is, when the pixels at the edge of the display area DA are enlarged, the number of pixels arranged in the nth pixel column PCn located at the outermost position is smaller than (n 2) th pixel train PC (n-1) th pixel train PC (n-1) and the (n-2) th pixel train PC (n-2). In other words, the farther from the center of the display area DA, the smaller the number of pixels arranged in the pixel column PC.

However, even with the above arrangement, a smooth circular display area can not be obtained. As a method for solving such a problem, there has been proposed a method of adjusting data input to a pixel positioned at the end of each pixel column (PC). However, There is a problem that the driving method becomes complicated because tracking and input data must be adjusted.

An object of the present invention is to provide a liquid crystal display device having a circular display area.

It is also an object to provide a circular display area without increasing the driving method or the manufacturing method.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising a first substrate and a second substrate facing each other, a liquid crystal layer disposed between the first and second substrates and driven by an electric field, A plurality of pixels arranged in a first direction are arranged as one pixel column and a number of pixels smaller than an (n-1) th pixel column are arranged in an nth pixel column, The aperture ratio of the first pixel located at one end of the pixel column is smaller than the second pixel of the nth pixel column and the aperture ratio of the mth pixel located at the other end of the nth pixel column is smaller than the aperture ratio of the (m-1) Of the liquid crystal display device.

Th pixel is greater than or equal to the second pixel and the aperture ratio of the (m-2) th pixel in the nth pixel train is greater than or equal to the (m-1) .

A gate wiring line extending in a second direction perpendicular to the first direction and intersecting the data line to define the pixel; A black matrix positioned corresponding to the gate wiring is disposed on the second substrate, and a width of the black matrix located in the m-th pixel is set to a width of the (m-1) Is larger than the black matrix in which the black matrix is located.

A gate wiring line extending in a second direction perpendicular to the first direction and intersecting the data line to define the pixel; And a black matrix positioned corresponding to the gate wiring is located on the second substrate, and a distance between the black matrix located above and below the m-th pixel is (m-1) th Is smaller than the distance between the black matrix located above and below the pixel.

Wherein each of the plurality of pixels includes first through third sub-pixels of red, green, and blue arranged in a second direction perpendicular to the first direction, and the first through third sub- The aperture ratio of the pixel is the same.

Wherein each of the plurality of pixels includes first through fourth sub-pixels of red, green, blue, and white arranged in a 2 * 2 matrix, and the aperture ratios of the first through fourth sub- It is the same thing.

The pixel electrode is located on the first substrate, the common electrode is located on the second substrate, and the electric field is formed between the pixel electrode and the common electrode.

The pixel electrode and the common electrode alternately arranged on the first substrate are positioned, and the electric field is formed between the pixel electrode and the common electrode.

In another aspect, the present invention provides a liquid crystal display comprising: a first substrate and a second substrate facing each other, the display substrate including a display region and a non-display region surrounding the display region; A gate wiring and a data wiring crossing each other on the first substrate to define a plurality of pixels; A thin film transistor located on the first substrate and connected to the gate wiring and the data wiring; A pixel electrode located on the first substrate and connected to the thin film transistor; A black matrix disposed on the second substrate and blocking light; A common electrode located on one of the first and second substrates and forming an electric field with the pixel electrode; And a liquid crystal layer positioned between the first and second substrates, wherein the black matrix corresponding to the pixels arranged at the edge of the display region is smaller than the black matrix corresponding to the pixels arranged at other portions of the display region A liquid crystal display device characterized by having a large area is provided.

According to the present invention, a liquid crystal display device having a circular display area can be provided by adjusting the aperture ratio of the pixel located at the end of each pixel column.

Specifically, the aperture ratio of the pixel is adjusted by increasing the width of the black matrix in the pixel positioned at the end of each pixel column, thereby providing a circular display area.

According to this configuration, there is an advantage that a liquid crystal display device having a circular display area can be provided without increasing the driving method and the manufacturing method.

1 is a schematic bottom view showing a display region of a general array substrate for a liquid crystal display device.
2 is a schematic view of a conventional liquid crystal display device having a circular display area.
3 is a schematic view of a liquid crystal display device having a circular display area according to the first embodiment of the present invention.
4 is a schematic view of a pixel portion of a liquid crystal display device according to a first embodiment of the present invention.
5 is a schematic view of a pixel portion of a liquid crystal display device according to a second embodiment of the present invention.
6 is a schematic view of a pixel portion of a liquid crystal display device according to a third embodiment of the present invention.
7 is a schematic cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.
8A and 8B are views showing the edge of the display area in the conventional liquid crystal display device and the liquid crystal display device of the present invention, respectively.
9 is a graph showing the relationship between the aperture ratio and the transmittance in the liquid crystal display device.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 3 is a schematic view of a liquid crystal display device having a circular display area according to a first embodiment of the present invention, and FIG. 4 is a schematic view of a pixel part of a liquid crystal display device according to the first embodiment of the present invention .

As shown in the figure, the liquid crystal display device of the present invention includes a circular display area DA and a non-display area NDA surrounding the display area DA. The pixel P arranged in the display area DA includes a gate wiring 110 extending in the first direction X and a data wiring 112 extending in the second direction Y crossing the gate wiring 110. [ (120). In order to realize a circular display area DA, pixels P are arranged in a step shape at the edge of the display area DA.

(N-1) -th pixel column PC (n-1) and the (n-2) -th pixel column PCn are arranged in the nth pixel column PCn located at the outermost (n-2)). Accordingly, the display area DA has a roughly circular shape.

Further, in the present invention, the aperture ratio of the pixel P arranged at the end of each pixel column is made smaller than the aperture ratio of the pixel P arranged at another position of the pixel column. the aperture ratio of the first pixel PCn1 located at one end of the nth pixel column PCn is equal to the aperture ratio of the second pixel PCn of the nth pixel column PCn, 2).

The aperture ratio of the a-th pixel PCn, a located at the other end of the n-th pixel column PCn is determined by the aperture ratio of the (a-1) th pixel PCn, (a- ). For example, the aperture ratio of the first pixel (PCn, 1) located at one end of the nth pixel column (PCn) and the ath pixel (PCn, a) located at the other end of the nth pixel column (PCn) Can be the same.

7, which is a schematic sectional view of a liquid crystal display device according to an embodiment of the present invention, a liquid crystal display device includes a first substrate 101 and a second substrate 102 facing each other, And a liquid crystal layer 160 positioned between the first and second substrates 101 and 102.

A gate line 110 extending in a first direction X and a data line 120 extending in a second direction Y intersect the gate line 110 are located on the first substrate 101 , The gate wiring 110 and the data wiring 120 define a pixel P. Though not shown, a thin film transistor connected to the gate line 110 and the data line 120 is disposed in each pixel P.

In addition, a black matrix BM is disposed on the second substrate 102 in correspondence with the gate lines 110. The black matrix BM prevents light leakage around the gate line 110. In addition, the black matrix BM may be positioned corresponding to the data line 120 and the thin film transistor. At this time, in the present invention, the width of the black matrix BM of the pixel P arranged at the end of each pixel column PC is set to be the same as the width of the black matrix BM of the pixel P BM) width. By varying the widths of the black matrix BM as described above, the aperture ratio of the pixel P can be adjusted, thereby making the display area DA appear circular.

3 and 4, the width adjustment of the black matrix BM is performed in the (n-1) -th pixel column PC (n-1) -2).

The pixel P may include a red first sub-pixel SP1, a green second sub-pixel SP2, and a blue third sub-pixel SP3. The first to third sub-pixels SP1, SP2 and SP3 may be arranged along the first direction X. [ In this case, the black matrix BM located at the end of each pixel column PC has the same width for all the first, second, and third sub-pixels SP1, SP2, and SP3, SP3) have the same aperture ratio.

The black matrix BM located at the first pixel PCn 1 located at one end has a first width and the black matrix BM located at the second pixel PCn 2 has a first width, The black matrix BM located in the third pixel PCn has a width that is smaller than the first width and the black matrix BM located in the third pixel PCn has a width equal to the second width. That is, the first pixel (PCn, 1) has a smaller aperture ratio than the second pixel (PCn, 2) or the third pixel (PCn, 3). In other words, the black matrix BM located at the top and bottom of the second pixel (PCn, 2) is spaced apart from the black matrix BM located at the top and bottom of the first pixel (PCn, 1) The black matrix BM located above and below the third pixel PCn 3 is spaced apart from the second distance d2 by a second distance d2 greater than the first distance d1. And are spaced apart by the same third distance d3. (d1 < d2 = d3)

(A-1) th pixel (PCn, (a-1)) of the a-th pixel PCn, a located at the other end of the nth pixel column PCn and the . That is, the black matrix BM located at the a-th pixel PCn, a has a smaller width than the black matrix BM located at the (a-1) th pixel PC (n (a-1)). In other words, the aperture ratio of the a-th pixel PCn, a is smaller than that of the (a-1) th pixel PC (a-1).

That is, the aperture ratio of each pixel is adjusted by adjusting the width of the black matrix BM while arranging pixels P having the same size. In other words, by adjusting the area of the black matrix BM, the aperture ratio of the pixel is adjusted.

At this time, the black matrix BM located in the first to third sub-pixels SP1, SP2, and SP3 arranged in one pixel P has the same width, And the third sub-pixels SP1, SP2, and SP3 have the same aperture ratio.

By adjusting the aperture ratio of the pixel P positioned at the end of each pixel column PCn as described above, the transmissivity can be adjusted, and as a result, the edge of the display area DA having a stepped shape can be seen as a circular shape.

5 is a schematic view of a pixel portion of a liquid crystal display device according to a second embodiment of the present invention. In Fig. 5, the first to third pixels PCn, 1, PCn, 2, PCn, 3 of the nth pixel column PCn are shown.

As shown in the figure, the black matrix BM located at the first pixel (PCn, 1) of the nth pixel column PCn has a first width and the black matrix BM located at the second pixel (PCn, 2) BM has a second width smaller than the first width, and the black matrix BM located at the third pixel (PCn, 3) has a third width smaller than the second width. That is, the aperture ratio of the second pixel (PCn, 2) is larger than the aperture ratio of the first pixel (PCn, 1) and smaller than the aperture ratio of the third pixel (PCn, 3).

In other words, the black matrix BM located at the top and bottom of the second pixel (PCn, 2) is spaced apart from the black matrix BM located at the top and bottom of the first pixel (PCn, 1) The black matrix BM located above and below the third pixel PCn is spaced apart from the second distance d2 by a second distance d2 that is greater than the first distance d1. And is spaced apart by a large third distance d3. (d1 <d2 <d3) That is, the aperture ratio of each pixel is adjusted by adjusting the width of the black matrix BM while arranging the pixels P having the same size.

At this time, the black matrix BM located in the first to third sub-pixels SP1, SP2, and SP3 arranged in one pixel P has the same width, And the third sub-pixels SP1, SP2, and SP3 have the same aperture ratio.

6 is a schematic view of a pixel portion of a liquid crystal display device according to a third embodiment of the present invention. 6 shows the first and second pixels PCn, 1, PCn, 2 of the nth pixel column PCn. Each pixel P is divided into first to fourth subpixels (SP1, SP2, SP3, SP4). The first and fourth sub-pixels SP1, SP2, SP3 and SP4 display red (R), green (G), blue (B) and white (W) colors, respectively.

As shown in the figure, the black matrix BM located at the first pixel (PCn, 1) of the nth pixel column PCn has a first width and the black matrix BM located at the second pixel (PCn, 2) BM) has a second width smaller than the first width. That is, the aperture ratio of the second pixel (PCn, 2) is larger than the aperture ratio of the first pixel (PCn, 1).

In other words, the black matrix BM located at the top and bottom of the second pixel (PCn, 2) is spaced apart from the black matrix BM located at the top and bottom of the first pixel (PCn, 1) (BM) is separated by a second distance (d2) larger than the first distance (d1). (d1 <d2 <d3) That is, the aperture ratio of each pixel is adjusted by adjusting the width of the black matrix BM while arranging the pixels P having the same size.

At this time, the black matrix BM located in the first to fourth sub-pixels SP1, SP2, SP3 and SP4 arranged in one pixel P has the same width, 1 to the fourth sub-pixels SP1, SP2, SP3, and SP4 have the same aperture ratio.

4 and 5, the aperture ratio of the third pixel is equal to the aperture ratio of the second pixel (PCn, 2) or the aperture ratio of the second pixel (PCn, 2) May be larger than the aperture ratio.

FIG. 7 is a schematic cross-sectional view of a liquid crystal display device according to an embodiment of the present invention, in which the first pixel and the second pixel are cut in the data line direction in FIG.

The liquid crystal display device includes a first substrate 101 and a second substrate 102 facing each other and a liquid crystal layer 160 disposed between the first and second substrates 101 and 102 do.

A gate line 110 extending in a first direction X and a data line 120 extending in a second direction Y intersect the gate line 110 are located on the first substrate 101 , The gate wiring 110 and the data wiring 120 define a pixel P. The gate wiring 110 and the data wiring 120 are insulated by a gate insulating film 112. Though not shown, a thin film transistor connected to the gate line 110 and the data line 120 is disposed in each pixel P.

For example, the thin film transistor includes a gate electrode connected to the gate wiring 110, the gate insulating film 112 covering the gate electrode, and a semiconductor layer 112 formed on the gate insulating film 112, And a source electrode and a drain electrode which are located on the semiconductor layer and are spaced apart from each other. The semiconductor layer may include an active layer made of pure amorphous silicon and an ohmic contact layer made of impurity amorphous silicon. Further, the source electrode may extend from the data line.

A pixel electrode 130 connected to the thin film transistor is disposed on the passivation layer 114. The passivation layer 114 covers the data line 120 and the thin film transistor. For example, the passivation layer 114 may include a drain contact hole exposing a drain electrode of the thin film transistor, and the pixel electrode 130 may contact the drain electrode through the drain contact hole, May be connected to the thin film transistor.

A color filter layer 142 is disposed on the second substrate 102 in correspondence with each pixel P and a color filter layer 142 is formed on the color filter layer 142, The common electrode 150 covering the entire surface of the second substrate 102 is positioned on the second substrate 102. The color filter layer 142 may include first to third color filter patterns 142a, 142b, and 142c having red, green, and blue colors, respectively. Alternatively, the color filter layer 142 may include first to fourth color filter patterns having red, green, blue, and white, respectively.

The common electrode 150 and the pixel electrode 130 are made of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO) And an electric field is generated by application of a voltage to drive the liquid crystal layer 160. 7, the pixel electrode 130 and the common electrode 150 are located on the first and second substrates 101 and 102, respectively. However, in the pixel electrode 130 and the common electrode 150, May be alternately arranged on the first substrate (101).

A feature of the present invention resides in the black matrix (BM). That is, the black matrix BM located at the first pixel PCn, 1 of the pixel column PC is formed to be spaced apart by the first distance d1, and the second pixel PCn, 2 of the pixel column PC Is formed to be spaced apart by a second distance d2 larger than the first distance d1. As a result, the aperture ratio, which means the ratio of the portion not covered by the black matrix BM, of the area of each pixel P is smaller than that of the second pixel (PCn, 2) in the first pixel (PCn, . Therefore, when the same voltage is applied, the transmittance of the first pixel (PCn, 1) becomes smaller than that of the second pixel (PCn, 2), so that the end of each pixel string has a round shape . In other words, the display area of the liquid crystal display device has a circular shape.

8A and 8B are views showing the edge of the display area in the conventional liquid crystal display device and the liquid crystal display device of the present invention, respectively.

As shown in FIG. 8A, the edge of the display area has a stepped shape in the conventional liquid crystal display device. However, in the case of FIG. 8B showing the liquid crystal display device of the present invention, the stepped shape is relaxed to have a circular shape as a whole.

9 is a graph showing the relationship between the aperture ratio and the transmittance in the liquid crystal display device. Sample 2 (S2) is a case in which a black matrix having a width larger than the width of the black matrix of Sample 1 (S1) is formed, and Sample 3 (S3) Is a case in which a black matrix having a width larger than the black matrix width of the sample 2 (S2) is formed. That is, the aperture ratio of the sample 2 (S2) is smaller than the aperture ratio of the sample 1 (S1) and larger than the aperture ratio of the sample 3 (S3). As shown, it can be seen that the transmittance is proportional to the aperture ratio.

Using this principle, in the present invention, the transmittance of a pixel is adjusted by decreasing the aperture ratio of the pixel located at the end of the pixel column. As a result, the end portion of the pixel array does not have a step shape but a round shape. As a result, the display region of the liquid crystal display device has a circular shape.

Further, in the present invention, there is an advantage in that the display area has a circular shape without adjusting the data or increasing the manufacturing process. That is, since the transmittance can be adjusted by adjusting the width in the step of forming the black matrix, no additional driving conditions or manufacturing steps are required.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

P: pixel
PC: Pixel column
BM: Black Matrix
130:
150: common electrode

Claims (9)

And a liquid crystal layer disposed between the first and second substrates and driven by an electric field, wherein the first and second substrates are provided with a plurality of pixels arranged in a first direction (N-1) &lt; th &gt; pixel columns are arranged in an n &lt; th &gt; pixel column,
Wherein the plurality of pixels have the same size all within a circular display area,
Wherein the black matrix located on the second substrate has a first width at a first pixel located at one end of the n-th pixel train and a second width smaller than the first width at a second pixel of the n- And the second pixel has an aperture ratio of the first pixel smaller than the second pixel,
Wherein the black matrix has a third width at an m-th pixel located at the other end of the n-th pixel train and a fourth width smaller than the third width in the (m-1) And the aperture ratio of the m-th pixel is smaller than the (m-1) -th pixel.
The method according to claim 1,
Th pixel is greater than or equal to the second pixel and the aperture ratio of the (m-2) th pixel in the nth pixel train is greater than or equal to the (m-1) Wherein the liquid crystal display device is a liquid crystal display device.
The method according to claim 1,
A gate wiring line extending in a second direction perpendicular to the first direction and intersecting the data line to define the pixel; A thin film transistor connected to the data line is located,
The black matrix is located corresponding to the gate wiring,
Wherein the distance between the black matrixes in the pixel column increases from the end to the center.
delete The method according to claim 1,
Wherein each of the plurality of pixels includes first through third sub-pixels of red, green, and blue arranged in a second direction perpendicular to the first direction, and the first through third sub- And the aperture ratio of the pixel is the same.
The method according to claim 1,
Wherein each of the plurality of pixels includes first through fourth sub-pixels of red, green, blue, and white arranged in a 2 * 2 matrix, and the aperture ratios of the first through fourth sub- Wherein the liquid crystal display device is the same as the liquid crystal display device.
The method according to claim 1,
Wherein a pixel electrode is disposed on the first substrate, a common electrode is disposed on the second substrate, and the electric field is formed between the pixel electrode and the common electrode.
The method according to claim 1,
Wherein a pixel electrode and a common electrode alternately arranged on the first substrate are positioned, and the electric field is formed between the pixel electrode and the common electrode.
A first substrate and a second substrate facing each other and including a circular display area and a non-display area surrounding the display area;
A gate wiring and a data wiring crossing each other on the first substrate to define a plurality of pixels;
A thin film transistor located on the first substrate and connected to the gate wiring and the data wiring;
A pixel electrode located on the first substrate and connected to the thin film transistor;
A black matrix disposed on the second substrate and blocking light;
A common electrode located on one of the first and second substrates and forming an electric field with the pixel electrode;
And a liquid crystal layer disposed between the first and second substrates,
The black matrix corresponding to the pixels arranged at the edge of the display area has an area larger than that of the black matrix corresponding to the pixels arranged at other parts of the display area,
Wherein the distance between the black matrixes increases from the end to the center in the pixel array in which the plurality of pixels are arranged in the first direction.

Images