KR101394928B1 - Liquid Crystal Display - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device for eliminating a vertical stripe phenomenon caused by a specific data pattern in a liquid crystal display device driven by Z-inversion.

According to the present invention, a thin film transistor for selecting a liquid crystal cell of an odd horizontal line among thin film transistors is connected to an odd gate line of the gate lines, and a data line arranged to the left or right of the liquid crystal cell of the odd horizontal line And a thin film transistor for selecting a liquid crystal cell of an excellent horizontal line among the thin film transistors is connected to an outermost gate line of the gate lines and is connected to a data line arranged on the right or left side of the liquid crystal cell of the excellent horizontal line . In this case, the thin film transistor of the odd horizontal line is formed by shifting to one of the left and right sides of the liquid crystal cell of the odd horizontal line, and the thin film transistor of the excellent horizontal line is formed by shifting the right and left of the liquid crystal cell And shifted to the remaining one.

Description

[0001] Liquid crystal display [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 that removes a vertical stripe phenomenon represented by a specific data pattern in a liquid crystal display device driven by a Z-inversion.

The liquid crystal display displays an image by adjusting the light transmittance of the liquid crystal cells according to a video signal. An active matrix type liquid crystal display device in which a thin film transistor (hereinafter referred to as "TFT") is formed for each liquid crystal cell displays a moving image in comparison with a liquid crystal display device of a passive matrix type The image can be displayed with a clearer image quality.

1, the active matrix type liquid crystal display panel includes a liquid crystal cell Clc at the intersection of the gate line GL and the data line DL and the gate line GL and the data line GL, A TFT for driving is formed. The TFT supplies the data voltage Vd supplied through the data line to the pixel electrode Ep of the liquid crystal cell Clc in response to a scan signal supplied through the gate line GL. To this end, the gate electrode of the TFT is connected to the gate line GL, the source electrode thereof is connected to the data line DL, and the drain electrode thereof is connected to the pixel electrode of the liquid crystal cell Clc. The liquid crystal cell Clc is charged with the potential difference between the data voltage Vd supplied to the pixel electrode Ep and the common voltage Vcom supplied to the common electrode Ec, As the array changes, the amount of light transmitted is controlled or the light is blocked. The common electrode Ec is formed on the upper substrate or the lower substrate of the liquid crystal display panel according to a method of applying an electric field to the liquid crystal cell Clc. A liquid crystal cell Clc is formed between the storage line (not shown) to which the common voltage Vcom is supplied and the pixel electrode Ep of the liquid crystal cell Clc or between the front gate line and the pixel electrode Ep of the liquid crystal cell Clc. A storage capacitor Cst is formed to maintain the charge voltage of the capacitor Cst.

Such a liquid crystal display device is driven by an " Inversion System "in which the polarity of the data voltage Vd is inverted at regular intervals in order to prevent deterioration and afterimage of the liquid crystal cell Clc. Inversion methods include a dot inversion method, a line inversion method, a column inversion method, and a frame inversion method.

The frame inversion scheme supplies a positive data voltage to all liquid crystal cells during an odd frame and a negative data voltage to all liquid crystal cells during an even frame. In this frame-inversion method, a flicker is severely generated because a variation in a voltage charged in a liquid crystal cell between frames is large.

In the line inversion method, a positive polarity data voltage is supplied to the liquid crystal cells of the odd horizontal line in the odd numbered frame, a negative data voltage is supplied to the liquid crystal cells of the excellent horizontal line, The polarity of the data voltage is reversed. In this line inversion method, since the polarity of the voltage charged in the liquid crystal cells between the horizontal lines is opposite to each other, a crosstalk occurs between the horizontal lines, and a flicker such as a stripe pattern occurs between the horizontal lines.

The column-inversion method supplies a positive polarity data voltage to the liquid crystal cells of the odd-numbered vertical lines in the odd-numbered frame and supplies a negative data voltage to the liquid crystal cells of the even-numbered vertical lines, The polarity of the data voltage is reversed. Since the polarity of the voltage charged in the liquid crystal cells between the vertical lines is opposite to that of the vertical line, crosstalk occurs between the vertical lines and a flicker such as a stripe pattern occurs between the horizontal lines.

The dot inversion scheme supplies positive polarity data voltages to the liquid crystal cells located at the intersection of the odd vertical line and the odd horizontal line in the odd frame and the liquid crystal cells located at the intersection of the vertical normal line and the excellent horizontal line, The liquid crystal cells located at the intersections of the lines and the excellent horizontal lines and the liquid crystal cells located at the intersections of the vertical normal lines and the odd horizontal lines are supplied with a negative data voltage. And, the dot inversion method during the even frame period following the odd frame reverses the polarity of the data voltage as before. In this dot-inversion method, the polarity of the data voltage is inverted every frame, and the polarity of the data voltage between the adjacent pixel cells in the vertical direction and the horizontal direction in the frame period is opposite to each other. Therefore, since the flicker is small, Method. However, in the dot-inversion method, the polarity of the data voltage must be inverted between adjacent liquid crystal cells in every horizontal direction, and the polarity of the data voltage must be inverted in every horizontal period. Therefore, And the power consumption increases.

In recent years, a Z-inversion scheme has been proposed to overcome the disadvantages of such a column version method and a dot inversion method. In the Z-inversion method, as shown in FIG. 2, TFTs formed on a liquid crystal panel are arranged in a zigzag manner in the vertical line direction, and data having a polarity controlled by a column inversion method is applied to the liquid crystal panel using a column inversion type data driving circuit Thereby driving the liquid crystal panel in dot-inversion. This Z-inversion method minimizes flicker between the vertical and horizontal lines by driving the liquid crystal panel in a dot-inversion mode, thereby enhancing the display quality. In addition, the Z-inversion method drives the liquid crystal panel using the dot inversion type data driving circuit The power consumption can be reduced. However, the Z-inversion method does not cause a problem in a general data pattern driving all the liquid crystal cells as shown in FIG. 3. However, in the specific data pattern driving only specific liquid crystal cells as shown in FIG. 4, And the vertical lines are largely deviated from each other, resulting in a pronounced longitudinal streak phenomenon. This will be described in detail as follows.

FIG. 3 is a view showing an opening surface in a general screen in a liquid crystal display device driven by a Z-inversion method, FIG. 4 is a drawing showing an opening surface in a specific pattern of a liquid crystal display device driven in a Z- to be. In Figs. 3 and 4, "T" indicates a region in which a TFT is formed, and "BM" indicates a region in which light is not transmitted through a black matrix formed on an upper substrate. The relatively brightly marked portion represents an opening surface through which light from the backlight unit is transmitted.

3, when the general data pattern is applied to the liquid crystal cell through the data line DL to drive all the liquid crystal cells, the widths P of the non-opening vertical lines including the data line DL are equal to each other . Since the widths (P) of the non-opening vertical lines are equal to each other, they are not easily visible to the human eye.

However, as shown in FIG. 4, when black data is applied to one of the odd-numbered and even-numbered data lines to drive the liquid crystal cells in zigzags, the width of a region where light is not transmitted is shifted between adjacent non- . In other words, the width A of the non-aperture vertical line including the data line DL to which the data pattern for driving the liquid crystal cell is applied is smaller than the width A of the non-aperture vertical line including the data line DL to which the black data is applied (T) of the TFT in comparison with the width (B). The larger the width difference (A-B) of the non-opening vertical lines, the easier it is to be recognized by the human eye.

In this manner, when driving the liquid crystal panel using the conventional Z-inversion method, the width A of a relatively wide non-opening vertical line is visually recognized due to the difference in width between adjacent non-opening vertical lines, There is a problem that stripe phenomenon appears.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a liquid crystal display device which eliminates the vertical stripe phenomenon caused by a specific data pattern in a liquid crystal display device driven by Z-inversion.

In order to achieve the above object, a liquid crystal display according to an embodiment of the present invention includes data lines and gate lines crossing each other, and a plurality of data lines arranged at intersections of the data lines and the gate lines to select liquid crystal cells A first substrate comprising thin film transistors; A second substrate facing the first substrate and including a black matrix pattern formed in a region corresponding to each of the data lines, the gate lines, and the thin film transistors; And a liquid crystal layer formed between the first and second substrates.
A thin film transistor for selecting a liquid crystal cell of an odd horizontal line among the thin film transistors is connected to an odd gate line of the gate lines and is connected to a data line arranged to the left or right of the liquid crystal cell of the odd horizontal line. The thin film transistor for selecting the liquid crystal cell of the excellent horizontal line among the thin film transistors is connected to the outermost gate line of the gate lines and connected to the data line arranged on the right side or the left side of the liquid crystal cell of the excellent horizontal line do.
Wherein the thin film transistor of the odd horizontal line is formed by shifting to one of the left and right sides of the liquid crystal cell of the odd horizontal line and the thin film transistor of the excellent horizontal line is shifted to the right side and the left side of the liquid crystal cell And shifted to the remaining one.

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The liquid crystal display according to the present invention shifts the formation region of the TFTs left and right in the liquid crystal cell so that the openings of the liquid crystal cells become symmetrical without lowering the luminance as compared with the prior art. Accordingly, the liquid crystal display according to the present invention can eliminate the vertical stripe phenomenon caused by the specific data pattern that appears when driving with Z-inversion.

Other objects and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the attached drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 5 to 11 attached hereto.

5 is a block diagram for explaining driving of a liquid crystal display according to an embodiment of the present invention.

5, a liquid crystal display device according to an embodiment of the present invention includes a liquid crystal panel 40 in which liquid crystal cells Clc are arranged in a matrix form, and a liquid crystal panel 40 in which gate lines GL1 to GLn of the liquid crystal panel 40 A data driving circuit 70 for driving the data lines DL1 to DLm + 1 of the liquid crystal panel 40 and a gate driving circuit 60 and a data driving circuit And a timing controller (50) for controlling the timing controller (70).

Liquid crystal is dropped between the upper glass substrate and the lower glass substrate of the liquid crystal panel 40. In the lower glass substrate of the liquid crystal panel 40, m x n liquid crystal cells Clc are arranged in a matrix type. In the lower glass substrate of the liquid crystal panel 40, m + 1 data lines DL1 to DLm + 1 and n gate lines GL1 to GLn are intersected to form a liquid crystal cell Clc TFTs for driving are formed. The TFTs supply data on the data lines DL1 to DLm to the liquid crystal cell Clc by being turned on in response to the scan pulse. The TFTs of the odd horizontal lines are located at intersections of the left data lines DL1 to DLm and the odd gate lines GL1, GL3, GL5 ... GLn-1 of the liquid crystal cell Clc, Are located at the intersections of the right data lines DL2 to DLm + 1 of the liquid crystal cell Clc and the even gate lines GL2, GL4, GL6, ..., and GLn. The gate electrodes of the TFTs are connected to the gate lines GL1 to GLm. The source electrodes of the TFTs located on the odd horizontal line are connected to the first to mth data lines DL1 to DLm and the source electrodes of the TFTs located on the excellent horizontal line are connected to the second to the (m + 1) th data lines DL2 to DLm + 1). The drain electrodes of the TFTs located on the horizontal horizontal line are connected to the pixel electrodes 42 of the liquid crystal cells Clc adjacent to the right side on the basis of the drain electrodes of the TFTs located on the horizontal horizontal line, And is connected to the pixel electrodes 42 of the liquid crystal cells Clc adjacent to the left side. Therefore, the liquid crystal cells Clc located on the odd horizontal line are charged with data supplied from the data lines DL1 to DLm adjacent to the left side on the basis of the liquid crystal cells Clc, and the liquid crystal cells Clc Clc) charges the data supplied from the data lines DL2 to DLm + 1 adjacent to the right side on the basis of itself. As a result, the TFTs included in the liquid crystal cells Clc of the same vertical line are arranged in a zig-zag manner between two data lines. The liquid crystal cells Clc are charged through the zigzag arranged TFTs through either one of the two adjacent left and right data lines to the positive or negative voltage.

On the upper glass substrate of the liquid crystal panel 40, a black matrix pattern is formed with color filter patterns of red, green, and blue. This black matrix pattern is patterned so as to overlap with a region where TFTs of the lower glass substrate are formed, gate lines GL1 to GLm, and data lines DL1 to DLm + 1, And the like.

The timing controller 50 supplies digital video data RGB supplied from a digital video card (not shown) to the data driving circuit 70. The timing controller 50 also has a timing for driving the data driving circuit 70 and the gate driving circuit 60 using the horizontal and vertical synchronizing signals Hsync and Vsync input thereto and the dot clock DCLK And generates control signals GDC and DDC. The source shift clock SSC, the source start pulse SSP, the polarity control signal POL, and the source output enable signal SOE are supplied to the timing control signal DDC for driving the data driving circuit 70 have. The timing control signal GDC for driving the gate drive circuit 60 includes a gate start pulse GSP, a gate shift clock GSC, and a gate output enable (GOE).

The gate drive circuit 60 sequentially supplies scan pulses to the gate lines GL1 to GLn using the timing control signal GDC from the timing controller 50. [ The scan pulses sequentially turn on the TFTs of the respective horizontal lines in units of horizontal lines to select the scan lines to which data is supplied. The gate driving circuit 60 includes a shift register for sequentially generating scan pulses and a level shifter for shifting the swing width of the voltage of the scan pulse to suitably drive the liquid crystal cell Clc.

The data driving circuit 70 outputs the m digital video data input from the timing controller 50 as it is in the odd horizontal period by using the timing control signal DDC from the timing controller 50 and outputs the m digital video data to the right horizontal period Shift one channel at a time. The data driving circuit 70 converts the digital video data and the blank data into analog data voltages by converting the m digital video data and the blank data shifted in the horizontal period unit into the positive gamma compensation voltage or the negative gamma compensation voltage . Here, the blank data is sampled by the timing controller 50 as blank data existing between the data enable periods in which the digital video data exists, and then supplied to the data driving circuit 70 together with the digital video data. The polarity of the data voltages converted to the analog form by the gamma compensation voltage is opposite to the polarity of the data adjacent horizontally as in the column inversion method because the positive gamma compensation voltage and negative polarity gamma voltage are perpendicular to each other.

M + 1 data voltages whose polarities are inverted in a column-inversion manner by the data driving circuit 70 are sequentially supplied to m + 1 data lines DL1 to DLm in every horizontal period in synchronization with the scan pulse . Here, m + 1 data voltages include m red, green, and blue digital video data (RGB) as described above and include one blank data. m video data voltages are shifted to the right in the even horizontal period. Since the polarity of the video data voltage is inverted after being shifted for every excellent horizontal periods, the liquid crystal panel 40 can display the data supplied in a column inversion mode in a dot inversion manner.

Since the data voltages of the same color are reversely shifted by one channel every horizontal period and the polarity is reversed, the data voltage supplied to the liquid crystal panel 40 is alternately supplied between two adjacent data lines in every horizontal period . For example, in FIG. 5, the green data supplied to the liquid crystal cells arranged on the second vertical line on the left side is polarized in every horizontal period, and alternately supplied to the second data line DL2 and the third data line DL3 do. This green data is supplied to the uppermost liquid crystal cell G21 through the second data line DL2 in the first horizontal period of the n-th frame as a negative voltage. In the second horizontal period of the n-th frame, the green data is inverted in the channel shifted state to the right by the data driving circuit 70, and the polarity is inverted to the second liquid crystal cell G22 through the third data line DL3 And is supplied with a positive voltage. In the third horizontal period of the n-th frame, the green data is polarized again in the state of being shifted one channel to the left by the data driving circuit 70, and is polarized again to the third liquid crystal cell G23 through the second data line DL2 And is supplied with a negative voltage.

The polarity of this data voltage is inverted in the next frame. That is, the green data supplied to the liquid crystal cell arranged on the second vertical line from the left is supplied to the liquid crystal cell G21 at the uppermost stage through the second data line DL2 in the first horizontal period of the (n + 1) Polarity voltage. In the second horizontal period of the (n + 1) -th frame, the green data is shifted to the right by one channel to the right by the data driving circuit 70, and the polarity of the data is reversed. G22 as a negative voltage. In the third horizontal period of the (n + 1) -th frame, the green data is reversed in polarity again in a channel shifted state to the left by the data driving circuit 70, and the third liquid crystal cell (G23) as a positive voltage.

As described above, positive polarity data voltages are supplied to the odd data lines DL1, DL3, DL5, ... of the liquid crystal panel 40 during the n-th frame period, and the positive data lines DL2, DL4, DL6 ... are supplied with a negative data voltage. During the (n + 1) th frame period, a negative data voltage is supplied to the odd data lines DL1, DL3, DL5, ... of the liquid crystal panel 40 and the even data lines DL2, DL4, ) Is supplied with a positive polarity data voltage.

On the other hand, the blank data BK is supplied to the leftmost first data line DL1 or the rightmost m + 1-th data line DLm + 1 because the m video data are shifted in the opposite direction by one channel every horizontal period, 1). This blank data BK is supplied to the (m + 1) -th data line DLm + 1 in which no video data is supplied in the odd horizontal period during the n-th frame period, and the first data And is supplied to the line DL1. During the (n + 1) -th frame period, the blank data BK is supplied to the first data line DL1 in which no video data is supplied in the odd horizontal period, and the (m + 1 data line DLm + 1. The blank data BK is sampled by the timing controller 50 and supplied to the data driving circuit 70 together with the digital video data.

A liquid crystal display according to an embodiment of the present invention driven in this manner includes a TN (Twisted Nematic) mode and a VA (Vertical Alignment) mode for driving liquid crystal by a vertical electric field, an In Plane Switching ) Mode, and an FFS (Fringe Field Switching) mode in which liquid crystal is driven by a horizontal / vertical electric field. Hereinafter, the first and second embodiments for eliminating the conventional vertical stripe phenomenon represented by a specific data pattern will be described.

FIG. 6 shows a liquid crystal display including liquid crystal cells having symmetrical opening surfaces in the left-right direction according to the first embodiment of the present invention.

Liquid crystal is dropped between the upper glass substrate and the lower glass substrate of the liquid crystal panel 40. In the lower glass substrate of the liquid crystal panel 40, a plurality of liquid crystal cells Clc are arranged in a matrix type. A plurality of data lines DL and a plurality of gate lines OGL and EGL cross the lower glass substrate of the liquid crystal panel 40 and TFTs for driving the liquid crystal cell Clc are formed at the intersections of the data lines DL and the gate lines OGL and EGL. do. The TFTs supply data on the data lines DL to the liquid crystal cell Clc by being turned on in response to the scan pulse. The TFTs of the odd horizontal lines OHL are located at the intersections of the left data lines DL and the odd gate lines OGL of the liquid crystal cell Clc respectively, Respectively, at the intersections of the right data lines DL and the even gate lines EGL of the cell Clc. The gate electrodes of the TFTs are connected to the gate lines EGL and OGL. The source electrodes of the TFTs located in the odd horizontal line OHL are respectively connected to the data lines DL adjacent to the left side on the basis of the source electrodes thereof and the source electrodes of the TFTs located in the excellent horizontal line EHL are connected to the right side And are connected to adjacent data lines DL, respectively. The drain electrodes of the TFTs located on the odd horizontal line OHL are respectively connected to the pixel electrodes 42 of the liquid crystal cells Clc on the right side of the odd horizontal line OHL, And the drain electrodes are respectively connected to the pixel electrodes 42 of the liquid crystal cells Clc adjacent to the left side with respect to the drain electrodes. Accordingly, the liquid crystal cells Clc located on the odd horizontal line OHL are charged with data supplied from the data lines DL adjacent to the left side on the basis of the liquid crystal cells Clc located on the odd horizontal line OHL, The liquid crystal cells Clc are charged with data supplied from the data lines DL adjacent to the right side with respect to the liquid crystal cells Clc. As a result, the TFTs included in the liquid crystal cells Clc of the same vertical line are arranged in a zig-zag manner between two data lines. The liquid crystal cells Clc are charged through the zigzag arranged TFTs through either one of the two adjacent left and right data lines to the positive or negative voltage.

On the upper glass substrate of the liquid crystal panel 40, a black matrix pattern (BM) is formed with color filter patterns of red, green, and blue. The black matrix pattern BM is patterned so as to overlap with a region where TFTs of the lower glass substrate are formed, gate lines OGL, EGL, and data lines DL, It is the role of blocking the occurrence.

Particularly, the liquid crystal display according to the first embodiment of the present invention is characterized in that when the TFTs in the odd horizontal line OHL and the excellent horizontal line EHL are respectively connected to the left and right sides of the data lines DL, And data lines DL that are shifted in the opposite direction of the neighboring thin film transistors in the line OHL and the excellent horizontal line EHL, respectively. In other words, the data lines DL in the odd horizontal line OHL are shifted to some extent to the left in the vicinity of the region where the TFTs are formed, and the data lines DL in the even horizontal line EHL are shifted To the right side. Then, the data lines DL are alternately shifted to the left or right side in units of horizontal lines in the vicinity of the region where the TFTs are formed, so that the region where the TFTs are formed is shifted to the left or right as a whole. Thus, when the formation region of the TFTs in the odd horizontal line OHL is shifted to the left and the formation region of the TFTs in the even horizontal line EHL is shifted to the right, each of the liquid crystal cells Clc is mirror- (44). ≪ / RTI > The opening surface 44 is a portion for displaying an image by transmitting light from a backlight unit (not shown), and is formed on the data lines DL, gate lines OGL, EGL, TFTs, and black matrix pattern BM .

Figs. 7A and 7B are views for explaining symmetrical opening surfaces in the odd and even horizontal lines OHL and EHL, respectively. 8 is a diagram showing that the width of a region where light is not transmitted in a specific data pattern driving only specific liquid crystal cells becomes equal in adjacent non-aperture vertical lines.

Referring to FIG. 7A, the TFTs of the liquid crystal cells Clc arranged in the odd horizontal line OHL are formed shifted to the left by C / 2 by the data lines DL shifted to the left in the vicinity thereof . Accordingly, the liquid crystal cells Clc arranged in the odd horizontal line OHL have symmetrical opening surfaces 44 in the left-right direction. Particularly, in the liquid crystal display according to the first embodiment of the present invention, the reduction of the opening surface by C / 2 at the lower right end of the opening surface 44 compensates for the same size (C / 2) at the lower left end, prevent.

Referring to FIG. 7B, the TFTs of the liquid crystal cells Clc arranged on the excellent horizontal line EHL are formed by shifting to the right by C / 2 by the data lines DL shifted to the right in the vicinity thereof . Accordingly, the liquid crystal cells Clc disposed on the excellent horizontal line EHL have symmetrical opening surfaces 44 in the left-right direction. Particularly, in the liquid crystal display according to the first embodiment of the present invention, the reduction of the opening surface by C / 2 at the lower left end of the opening surface 44 compensates for the same size (C / 2) at the lower right end, prevent.

As a result, in the liquid crystal display according to the first embodiment of the present invention, the opening faces of the liquid crystal cells Clc are symmetrically arranged with no lowering of brightness compared with the prior art, The black stripes are applied to either one of the first and second substrates to prevent vertical stripe phenomenon in the conventional case in which the liquid crystal cells are driven in a zigzag manner.

9 shows a liquid crystal display including liquid crystal cells having symmetrical opening surfaces in the left and right direction according to a second embodiment of the present invention.

Liquid crystal is dropped between the upper glass substrate and the lower glass substrate of the liquid crystal panel 40. In the lower glass substrate of the liquid crystal panel 40, a plurality of liquid crystal cells Clc are arranged in a matrix type. A plurality of data lines DL and a plurality of gate lines OGL and EGL cross the lower glass substrate of the liquid crystal panel 40 and TFTs for driving the liquid crystal cell Clc are formed at the intersections of the data lines DL and the gate lines OGL and EGL. do. The TFTs supply data on the data lines DL to the liquid crystal cell Clc by being turned on in response to the scan pulse. The TFTs of the odd horizontal lines OHL are located at the intersections of the left data lines DL and the odd gate lines OGL of the liquid crystal cell Clc respectively, Respectively, at the intersections of the right data lines DL and the even gate lines EGL of the cell Clc. The gate electrodes of the TFTs are connected to the gate lines EGL and OGL. The source electrodes of the TFTs located in the odd horizontal line OHL are respectively connected to the data lines DL adjacent to the left side on the basis of the source electrodes thereof and the source electrodes of the TFTs located in the excellent horizontal line EHL are connected to the right side And are connected to adjacent data lines DL, respectively. The drain electrodes of the TFTs located on the odd horizontal line OHL are respectively connected to the pixel electrodes 42 of the liquid crystal cells Clc on the right side of the odd horizontal line OHL, And the drain electrodes are respectively connected to the pixel electrodes 42 of the liquid crystal cells Clc adjacent to the left side with respect to the drain electrodes. Accordingly, the liquid crystal cells Clc located on the odd horizontal line OHL are charged with data supplied from the data lines DL adjacent to the left side on the basis of the liquid crystal cells Clc located on the odd horizontal line OHL, The liquid crystal cells Clc are charged with data supplied from the data lines DL adjacent to the right side with respect to the liquid crystal cells Clc. As a result, the TFTs included in the liquid crystal cells Clc of the same vertical line are arranged in a zig-zag manner between two data lines. The liquid crystal cells Clc are charged through the zigzag arranged TFTs through either one of the two adjacent left and right data lines to the positive or negative voltage.

On the upper glass substrate of the liquid crystal panel 40, a black matrix pattern (BM) is formed with color filter patterns of red, green, and blue. The black matrix pattern BM is patterned so as to overlap with a region where TFTs of the lower glass substrate are formed, gate lines OGL, EGL, and data lines DL, It is the role of blocking the occurrence.

In particular, the liquid crystal display according to the second embodiment of the present invention uses the black matrix pattern BM so that each of the liquid crystal cells Clc has a symmetrical opening surface 144 in the left-right direction. The shape modification of the black matrix pattern (BM) is advantageous in terms of manufacturing cost and difficulty in processing as compared with shifting the data line. This black matrix pattern BM overlaps and overlaps the TFTs disposed on the left and right sides of the data lines DL in the odd horizontal line OHL and the excellent horizontal line EHL, Are overlapped with intersections of the data lines DL and the gate lines OGL and EGL without TFTs. The opening surface 144 is a portion that transmits light from a backlight unit (not shown) to display an image, and is provided on the data lines DL, gate lines OGL, EGL, TFTs, and black matrix pattern BM .

Figs. 10A and 10B are views for explaining symmetrical opening surfaces in odd and even horizontal lines OHL and EHL, respectively. 11 is a view showing that the width of a region where light is not transmitted in a specific data pattern driving only specific liquid crystal cells becomes equal in adjacent non-aperture vertical lines.

10A, the black matrix pattern BM in the liquid crystal cells Clc arranged on the odd horizontal line OHL is divided into a forming region C of the TFTs disposed on the left side of the liquid crystal cells Clc, Overlaps with the right region where the TFTs are not formed by the overlap region C, and is also patterned. Accordingly, the liquid crystal cells Clc arranged in the odd horizontal line OHL have symmetrical opening surfaces 144 in the left-right direction.

Referring to FIG. 10B, the black matrix pattern BM in the liquid crystal cells Clc arranged on the excellent horizontal line EHL is divided into a forming region C of the TFTs disposed on the right side of the liquid crystal cells Clc, Overlaps with the left region where the TFTs are not formed by the overlap region C, and is also patterned. Accordingly, the liquid crystal cells Clc arranged on the excellent horizontal line EHL have symmetrical opening surfaces 144 in the left-right direction.

As a result, in the liquid crystal display according to the second embodiment of the present invention, the opening surface of the liquid crystal cells Clc is made symmetrical more easily than in the process, The conventional vertical stripe phenomenon in the case of driving the liquid crystal cells by zigzag by applying the black data to one side is prevented.

On the other hand, these first and second embodiments may be used in combination. In other words, the second embodiment may be applied to the first embodiment where the data lines can be easily shifted in the process of patterning the liquid crystal panel, for locations where data lines can not be easily shifted.

As described above, the liquid crystal display according to the present invention shifts the formation region of the TFTs left and right in the liquid crystal cell, thereby making the opening faces of the liquid crystal cells symmetrical with each other without lowering the luminance. Accordingly, the liquid crystal display according to the present invention can eliminate the vertical stripe phenomenon caused by the specific data pattern that appears when driving with Z-inversion.

Furthermore, the liquid crystal display device according to the present invention uses a black matrix pattern to make the opening surfaces of the liquid crystal cells symmetrical more easily than in the process, so that vertical stripes due to a specific data pattern appear when driving with Z- Can be removed.

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. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1 is an equivalent circuit diagram of a general liquid crystal display device.

2 is a layout view of a liquid crystal cell of a liquid crystal display device driven by a conventional Z-inversion.

3 is a view showing an opening surface in a general data pattern of a liquid crystal display device driven by a conventional Z-inversion method.

4 is a view showing an opening surface in a specific data pattern of a liquid crystal display device driven by a conventional Z-inversion method;

FIG. 5 is a block diagram for explaining driving of a liquid crystal display according to an embodiment of the present invention; FIG.

6 is a view showing a liquid crystal display including liquid crystal cells having symmetrical opening surfaces in the left-right direction according to the first embodiment of the present invention.

Figs. 7A and 7B are views for explaining symmetrical opening surfaces in odd and even horizontal lines OHL and EHL, respectively. Fig.

Figure 8 shows that the width of the region where light is not transmitted in a specific data pattern driving only certain liquid crystal cells is the same in adjacent non-aperture vertical lines.

9 is a view showing a liquid crystal display device including liquid crystal cells having symmetrical opening surfaces in the left-right direction according to a second embodiment of the present invention.

Figs. 10A and 10B are views for explaining symmetrical opening surfaces in odd and even horizontal lines OHL and EHL, respectively. Fig.

Fig. 11 shows that the width of a region where light is not transmitted in a specific data pattern driving only certain liquid crystal cells is the same in adjacent non-aperture vertical lines. Fig.

DESCRIPTION OF THE RELATED ART [0002]

40: liquid crystal panel 50: timing controller

60: Gate driving circuit 70: Data driving circuit

42: pixel electrode 44, 144: opening face

Claims (9)

A first substrate including data lines and gate lines crossing each other, and thin film transistors disposed at intersections of the data lines and the gate lines to select liquid crystal cells; A second substrate facing the first substrate and including a black matrix pattern formed in a region corresponding to each of the data lines, the gate lines, and the thin film transistors; And And a liquid crystal layer formed between the first and second substrates, A thin film transistor for selecting a liquid crystal cell of an odd horizontal line among the thin film transistors is connected to an odd gate line of the gate lines and is connected to a data line arranged on the left or right side of the liquid crystal cell of the odd horizontal line, A thin film transistor for selecting a liquid crystal cell of an excellent horizontal line among the thin film transistors is connected to an outermost gate line of the gate lines and connected to a data line arranged on the right side or left side of the liquid crystal cell of the excellent horizontal line, Wherein the thin film transistor of the odd horizontal line is formed by shifting to one of the left and right sides of the liquid crystal cell of the odd horizontal line and the thin film transistor of the excellent horizontal line is formed by shifting to the other one of the right and left sides of the liquid crystal cell And the liquid crystal layer is shifted. The method according to claim 1, Wherein an opening surface of the liquid crystal cell is defined by the data lines, the gate lines, the thin film transistors, and the black matrix pattern. delete delete delete A first substrate including data lines and gate lines crossing each other, and thin film transistors disposed at intersections of the data lines and the gate lines to select liquid crystal cells; A second substrate facing the first substrate and including a black matrix pattern formed in a region corresponding to each of the data lines, the gate lines, and the thin film transistors; And And a liquid crystal layer formed between the first and second substrates, A thin film transistor for selecting a liquid crystal cell of an odd horizontal line among the thin film transistors is connected to an odd gate line of the gate lines and is connected to a data line arranged on the left or right side of the liquid crystal cell of the odd horizontal line, A thin film transistor for selecting a liquid crystal cell of an excellent horizontal line among the thin film transistors is connected to an outermost gate line of the gate lines and connected to a data line arranged on the right side or left side of the liquid crystal cell of the excellent horizontal line, The black matrix pattern is overlapped with the thin film transistor formation region of the liquid crystal cell arranged in the odd and even horizontal lines and overlaps with the region in which the thin film transistor of the liquid crystal cell corresponding to the thin film transistor formation region is not formed by the overlap region And the liquid crystal display device. 7. The method according to claim 1 or 6, Wherein each of the liquid crystal cells has a symmetrical opening surface in the left-right direction. The method according to claim 1, The data lines in the odd-numbered horizontal lines are formed in a U-shape in the vicinity of a region where the thin-film transistors are formed, and the data lines in the even-numbered horizontal lines are formed in an inverted U- Liquid crystal display device. 7. The method according to claim 1 or 6, And vertical stripe phenomenon is removed when driving the Z-inversion.

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