KR101578216B1 - Liquid Crystal Panel and Liquid Crystal Display device having the same - Google Patents

Abstract

A liquid crystal panel and a liquid crystal display device having the same are disclosed.

A liquid crystal panel according to the present invention includes a plurality of gate lines, a plurality of data lines formed on a substrate, a thin film transistor formed for each region defined by the intersection of the plurality of gate lines and the plurality of data lines, A first horizontal line including a pixel electrode, a first liquid crystal cell connected to the data line adjacent to the left of the plurality of data lines through the thin film transistor, and a second horizontal line including a data line adjacent to the right of the plurality of data lines, A second horizontal line including a second liquid crystal cell connected through the thin film transistor, and a data connection line electrically connecting the last data line located at the outermost one of the plurality of data lines to the first data line , The first data line is connected to a first liquid crystal cell connected to the first horizontal line, Atmospheres which is connected to the second liquid crystal cell electrically connected to the second horizontal lines.

Z-inversion method, data driver IC, data connection line

Description

[0001] The present invention relates to a liquid crystal panel and a liquid crystal display device having the same,

The present invention relates to a liquid crystal panel. In particular, in a Z-inversion driving method, a Z-inversion driving method can be implemented using an existing data driver IC by electrically connecting a first data line and a last data line, A liquid crystal panel and a liquid crystal display device having the same that can reduce manufacturing cost and power consumption because development of a driver IC is unnecessary.

The liquid crystal display device displays an image by adjusting the light transmittance of liquid crystal having dielectric anisotropy using an electric field. To this end, the liquid crystal display device includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix, and a driving circuit for driving the liquid crystal panel.

Such a liquid crystal display device drives the liquid crystal panel by inversion driving method in order to prevent degradation of liquid crystal and improve display quality. Inversion driving methods include a frame inversion method, a line inversion method, and a dot inversion method.

In the dot inversion driving method, the polarities of the liquid crystal cells are opposite to those of the adjacent liquid crystal cells in the horizontal and vertical directions, and are inverted for each frame. Such a dot-in-version driving method provides excellent image quality as compared with other inversion driving methods by making flickers generated between adjacent liquid crystal cells in the vertical and horizontal directions cancel each other. However, in the dot inversion driving method, since the polarity of the pixel voltage signal supplied from the data driver to the data line must be inverted in the horizontal and vertical directions, the variation of the pixel signal is larger than other inversion driving methods, There are disadvantages.

In recent years, in consideration of the power consumption aspect of such an inversion method, a data driver is driven by a column inversion driving method and a thin-film transistor (TFT) formed on a liquid crystal panel is arranged in a zigzag manner, The Z-inversion drive method has been introduced.

1 is a schematic view of a liquid crystal display panel for implementing a conventional Z-inversion driving method.

1, a liquid crystal display panel 10 for implementing a conventional Z-inversion driving method is provided with an intersection of a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm + 1, And a liquid crystal cell including a thin film transistor (TFT) and a pixel electrode 20 formed for each defined region. The thin film transistor TFT supplies a data signal from the data lines DL1 to DLm + 1 to the pixel electrode 20 in response to a scan signal from the gate line GL. The pixel electrode 20 controls the transmittance of light by driving a liquid crystal positioned between the pixel electrode 20 and a common electrode (not shown) in response to a pixel signal. These liquid crystal cells are alternately connected to the different data lines DL adjacent to each other along the vertical direction through the thin film transistor TFT.

At this time, only the liquid crystal cells of the even-numbered horizontal lines connected to the even-numbered gate lines GL2, GL4, ... are electrically connected to the last data line DLm + 1 of the data lines DL1 to DLm + 1. The last data line DLm + 1 is a data line added to implement the Z-inversion driving method.

In order to drive the last data line DLm + 1 to be added, the data driver must be designed to correspond to the Z-inversion driving method. Therefore, if the liquid crystal display device is driven by the Z-inversion driving method, a new data driver corresponding to the Z-inversion driving method is necessarily required, which increases the manufacturing cost, - There is a problem that can not be applied to inversion driving method.

The present invention relates to a liquid crystal panel capable of electrically connecting a first data line and a last data line in a Z-inversion driving scheme to implement a Z-inversion driving method using an existing data driver IC, and a liquid crystal display The present invention has been made in view of the above problems.

It is another object of the present invention to provide a liquid crystal panel and a liquid crystal display device having the same that can reduce manufacturing cost and power consumption.

A liquid crystal panel according to an embodiment of the present invention includes a plurality of gate lines and a plurality of data lines formed on a substrate, a thin film transistor formed for each region defined by the intersection of the plurality of gate lines and the plurality of data lines, A first horizontal line including a first liquid crystal cell connected to a data line adjacent to the left of the plurality of data lines through the thin film transistor and a second horizontal line connected to the right side of the plurality of data lines, A second horizontal line including a second liquid crystal cell connected to the data line through the thin film transistor, and a data connection line electrically connecting the last data line located at the outermost one of the plurality of data lines and the first data line; Wherein the first data line is connected to a first liquid crystal cell connected to the first horizontal line, Last data lines are electrically connected to the second liquid crystal cell connected to the second horizontal lines.

A liquid crystal display according to an exemplary embodiment of the present invention includes a plurality of gate lines, a plurality of data lines, a thin film transistor formed in each region defined by intersections of the plurality of gate lines and a plurality of data lines, A first horizontal line including a first liquid crystal cell connected to a left adjacent data line among the plurality of data lines through the thin film transistor and a second horizontal line connected to the data line adjacent to the right side among the plurality of data lines, A second horizontal line including a second liquid crystal cell connected through the thin film transistor, and a data connection line electrically connecting the last data line located at the outermost one of the plurality of data lines and the first data line A liquid crystal display device comprising: a liquid crystal panel; a gate driver for driving the plurality of gate lines; And a data driver electrically connected to the other data lines except the last data line among the plurality of data lines and providing data signals to the connected data lines, The first data line is connected to the first liquid crystal cell connected to the first horizontal line and the last data line is electrically connected to the second liquid crystal cell connected to the second horizontal line.

The liquid crystal display according to the present invention can realize a Z-inversion driving method using an existing data driver IC by electrically connecting the first data line and the last data line in the Z-inversion driving method, And power consumption can be reduced.

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

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

2, a liquid crystal display according to an embodiment of the present invention includes a liquid crystal panel 110 having a matrix of liquid crystal cells, a gate for driving the gate lines GL1 to GLn of the liquid crystal panel 110, A data driver 130 for driving the data lines DL1 to DLm + 1 of the liquid crystal panel 110, a timing controller 130 for controlling the gate driver 120 and the data driver 130, (140).

The liquid crystal panel 110 includes a thin film transistor TFT formed for each region defined by intersections of gate lines GL1 through GLn and data lines DL1 through DLm + 1 and a liquid crystal cell including a pixel electrode PXL do.

The thin film transistor TFT supplies a data signal from the data lines DL1 to DLm + 1 to the pixel electrode PXL in response to a scan signal from the gate line GL. The pixel electrode PXL controls the transmittance of light by driving a liquid crystal located between the pixel electrode PXL and a common electrode (not shown) in response to a data signal. This liquid crystal cell is alternately connected to another data line DL adjacent to the liquid crystal cell along the vertical direction through the thin film transistor TFT.

For example, the liquid crystal cells of the odd-numbered horizontal lines connected to the odd-numbered gate lines GL1, GL3, GL5, ... are connected to the left adjacent data lines DLi (i is a positive integer) Receive. On the other hand, the liquid crystal cells of the even-numbered horizontal lines connected to the even-numbered gate lines GL2, GL4, GL6, ... are connected to the right adjacent data line DLi + 1 to receive data signals.

The timing controller 140 controls the gate driver 120 and the data driver 130 using a synchronous signal Vsync and Hsync provided from an external system and a clock signal CLK and a data enable signal DE And supplies a data signal to the data driver 130. The data driver 130 supplies a data signal to the data driver 130. [ The gate control signal GCS generated by the timing controller 140 includes a gate start pulse GSP, a gate shift clock signal GSC and a gate output enable signal GOE. The data control signal DCS generated by the timing controller 140 includes a source start pulse SSP, a source shift clock signal SSC, a source output enable signal SOE and a polarity control signal POL .

The gate driver 120 sequentially supplies a scan signal to the gate lines GL1 to GLn using the gate control signals GCS. Accordingly, the gate driver 120 drives the thin film transistor (TFT) in units of horizontal lines in response to the scan signal.

The data driver 130 converts an input data signal to an analog pixel voltage and supplies a pixel voltage of one horizontal line to the data lines DL1 to DLm for every one horizontal period in which a scan signal is supplied to the gate line GL do.

The data driver 130 supplies the pixel voltages in a column-by-column version manner, so that the pixel voltages supplied to the data lines DL1 to DLm have a polarity opposite to that of the adjacent data lines DL, To be inverted. In other words, the data driver 130 supplies the pixel signals of opposite polarities to the odd data lines DL1, DL3, ..., and the even data lines DL2, DL4, ..., Thereby reversing the polarity of the pixel voltage supplied to the pixels DL1 to DLm in frame units.

In this case, since the pixel electrode PXL is arranged in a staggered manner with respect to the data lines DL1 to DLm + 1 to which the pixel voltage is supplied in a column-version manner, the liquid crystal cells including the pixel electrode PXL And is driven in a dot-inversion manner.

At this time, the data lines DL2 to DLm except for the first data line DL1 and the last data line DLm + 1 are electrically connected to the thin film transistors TFT connected to the gate lines GL1 to GLn . The first data line DL1 is electrically connected to the thin film transistor TFT connected to the odd-numbered gate lines GL1, GL3, ..., and the last data line DLm + 1 is connected to the even- GL2, GL4, ..., and TFT connected to the TFTs.

The data driver 130 supplies the pixel voltages to the data lines DL1 to DLm in a column inversion manner, but the liquid crystal cells on the liquid crystal panel 110 are arranged in a zigzag manner, So that the liquid crystal display device is driven by the Z-inversion method.

At this time, since the last data line DLm + 1 is not electrically connected to the data driver 130, the data driver 130 selects the last data line DLm + 1 among the data lines DL1 to DLm + The pixel voltage is not supplied.

The last data line DLm + 1 is electrically connected to the first data line DL1 through the data connection line 150. [ As a result, the pixel voltage supplied to the first data line DL1 is provided to the last data line DLm + 1.

The data connection line 150 is formed on the non-display region of the liquid crystal panel 110 in parallel with the gate lines GL1 to GLn.

The data connection line 150 is located above the liquid crystal panel 110 and electrically connects the first and last data lines DL1 and DLm + 1. However, the data connection line 150 is located below the liquid crystal panel 110 The first and last data lines DL1 and DLm + 1 may be electrically connected.

The data connection line 150 is formed of the same process and the same material as the gate line GL and electrically connected to the first and last data lines DL1 and DLm + 1 through a contact hole (not shown) . The data connection line 150 is formed of the same material as the pixel electrode PXL and has contact holes (not shown) with the first and last data lines DL1 and DLm + 1, respectively. As shown in FIG.

For example, a scan signal is supplied to the first gate line GL1 so that even if the pixel voltage supplied to the first data line DL1 is supplied to the last data line DLm + 1, Is connected to the even-numbered gate lines GL2 and GL4 so that the pixel voltage of the first data line DL1 provided to the last data line DLm + 1 is connected to the last data line DLm + It does not affect the liquid crystal cell.

Accordingly, if a positive (+) pixel voltage is provided to the first data line DL1 during the first frame, the positive (+) pixel voltage is supplied to the liquid crystal cell connected to the first data line DL1 And the positive polarity pixel voltage is not provided to the liquid crystal cell connected to the last data line DLm + 1.

If the pixel voltage of negative polarity is supplied to the first data line DL1 in the next frame, the pixel voltage of the negative polarity is not supplied to the liquid crystal cell connected to the first data line DL1 And the liquid crystal cell connected to the last data line DLm + 1 is provided with the pixel voltage of negative polarity.

In this way, even if the last data line DLm + 1 is not electrically connected to the data driver 130, the last data line DLm + 1 is electrically connected to the first data line DL1, The display device can implement a Z-inversion driving method.

Fig. 3 is a schematic diagram of a liquid crystal display device showing the data connection line of Fig. 2 according to another embodiment.

3, the liquid crystal display device according to another embodiment includes a liquid crystal panel 110 composed of a thin film transistor array substrate 101 and a color filter substrate 103, And a data PCB 125 electrically connected to the liquid crystal panel 110 through first and second TCP (Tape Carrier Packages) 135a and 135b at a predetermined interval.

The first and second TCPs 135a and 135b are electrically connected to the first to m-th data lines DL1 to DLm among the data lines DL1 to DLm + 1 arranged in the liquid crystal panel 110, The first and second data driver ICs 130a and 130b are mounted. In detail, the first data driver IC 130a is electrically connected to first to m / 2th data lines DL1 to DLm / 2 of the data lines DL1 to DLm, The data lines 130b are electrically connected to the (m + 1/2) th to (m + 1) th data lines DLm + 1/2 to DLm.

The last data line DLm + 1, which is not electrically connected to the first and second data driver ICs 130a and 130b, is arranged at the outermost right side of the liquid crystal panel 110. The last data line DLm + 1 and the first data line DL1 are electrically connected to the data connection line 250 through the first and second link lines 255a and 255b.

The data connection line 250 is formed on the data printed circuit board 125 and one side thereof is electrically connected to the first link line 255a formed on the first TCP 135a, 2 TCP 135b. The second link line 255b is formed on the second TCP line 135b.

The first link line 255a is electrically connected to the first data line DL1 arranged on the liquid crystal panel 110 via the first TCP 135a and the second link line 255b is electrically connected to the first data line DL1, And is electrically connected to the last data line DLm + 1 arranged on the liquid crystal panel 110 via the second TCP 135b.

In this way, the first data line DL1 and the last data line DLm + 1 can be electrically connected.

As a result, the liquid crystal display according to the present invention is capable of electrically connecting the first data line DL1 and the last data line DLm + 1 to the last data line DLm + 1 by applying the Z inversion driving method It can be driven by using the pixel voltage supplied to the first data line DL1 even if it is not electrically connected to the data driver.

Therefore, even if the last data line DLm + 1 is formed at the outermost side of the liquid crystal panel for the Z-inversion driving method, the liquid crystal display according to the present invention can connect the last data line DLm + 1 to the first data line DL1), it is possible to implement a Z-inversion driving method by using a data driver for driving another existing inversion (frame, line, column, dot, etc.).

The liquid crystal display device according to the present invention electrically connects the last data line located at the outermost part of the liquid crystal panel to the first data line and uses a data driver for another inversion driving method to perform a Z- It is not necessary to design a new data driver for the Z-inversion driving method. Therefore, the liquid crystal display according to the present invention can reduce the manufacturing cost for designing a new data driver for the Z-inversion driving method, and can reduce the power consumption because the data driver is driven by the column inversion method .

1 is a schematic view of a liquid crystal display panel for implementing a conventional Z-inversion driving method.

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

Fig. 3 is a schematic diagram of a liquid crystal display showing the data connection line of Fig. 2 according to another embodiment; Fig.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

101: thin film transistor array substrate 103: color filter substrate

110: liquid crystal panel 120: gate driver

125: data printed circuit board 130: data driver

130a, 130b: first and second data driver ICs

135a, 135b: first and second TCP 140: timing controller

150, 250: data connection lines 255a, 255b: first and second link lines

Claims (11)

A plurality of gate lines and a plurality of data lines on a substrate; A thin film transistor arranged for each region defined by the intersection of the plurality of gate lines and the plurality of data lines; a pixel electrode connected to the thin film transistor; A first horizontal line including a first liquid crystal cell connected to a left adjacent data line among the plurality of data lines through the thin film transistor; A second horizontal line including a second liquid crystal cell connected to the right adjacent data line among the plurality of data lines through the thin film transistor; And And a data connection line electrically connecting the last data line located at the outermost one of the plurality of data lines and the first data line located at the outermost one of the plurality of data lines, Wherein the first data line is connected to a first liquid crystal cell connected to the first horizontal line and the last data line is electrically connected to a second liquid crystal cell connected to the second horizontal line. The method according to claim 1, Wherein the data connection line is arranged in any one of an upper portion and a lower portion of the substrate and is parallel to the plurality of gate lines. The method according to claim 1, And the data connection line is connected to the first data line and the last data line through the contact hole, respectively. delete A thin film transistor arranged for each of a plurality of gate lines and a plurality of data lines, a plurality of gate lines and a plurality of data lines, and pixel electrodes connected to the plurality of data lines, A first horizontal line including a first liquid crystal cell connected to the left adjacent data line through the thin film transistor and a second liquid crystal cell connected to the data line adjacent to the right side among the plurality of data lines through the thin film transistor, A liquid crystal panel having a second horizontal line including a cell and a data connection line electrically connecting the last data line positioned at the outermost one of the plurality of data lines and the first data line positioned at the outermost one of the plurality of data lines; A gate driver for driving the plurality of gate lines; And A plurality of data lines electrically connected to data lines other than the last data line among the plurality of data lines, the data lines being mounted on a printed circuit board spaced apart from a first side edge of the liquid crystal panel, Driver, Wherein the first data line is connected to a first liquid crystal cell connected to the first horizontal line and the last data line is electrically connected to a second liquid crystal cell connected to the second horizontal line. . 6. The method of claim 5, Wherein the data driver reverses the polarity of the data signal to be supplied to the remaining data lines except for the last data line in units of the data lines. 6. The method of claim 5, Wherein the data connection line is arranged in one of an upper portion and a lower portion of the liquid crystal panel and is parallel to the plurality of gate lines. 6. The method of claim 5, Wherein the data connection line is patterned on the printed circuit board to electrically connect the first data line and the last data line. 6. The method of claim 5, Wherein the data connection line is connected to the first data line and the last data line through a contact hole, respectively. delete 6. The method of claim 5, And a TCP (Tape Carrier Package) connecting the liquid crystal panel and the printed circuit board and having the data driver disposed therein, And the TCP includes a link line connecting the data connection line and the first data line or the last data line.

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