KR20080062879A - Liquid crystal display device and method driving of the same - Google Patents

Abstract

An LCD device and a driving method thereof are provided to share a data line in a previous pixel line and a current pixel line in a boundary between data driver ICs, thereby reducing the number of data lines and reducing a cost. An LCD(Liquid Crystal Display) device comprises an LCD panel(2), plural data lines, and at least one data driver IC(Integrated Circuit)(14). The LCD panel includes plural pixels composed in a matrix form. The plural data lines are connected to plural pixel lines determined by the plural pixels. At least one data driver IC is connected to the plural data lines. Each data driver IC drives n pixel lines. The n pixel lines are driven by n+1 data lines. A first data line and a (n+1)-numbered data line receive a pixel electrode through an output channel.

Description

Liquid crystal display device and method driving of the same

1 is a view showing a liquid crystal display device according to the present invention.

2 is a view showing a connection structure of a data drive integrated circuit and a data line according to the present invention;

3 is a view showing driving of a liquid crystal display device according to the present invention;

4 is a view showing a liquid crystal display device according to another embodiment of the present invention.

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device and a driving method thereof capable of improving a heat generation problem.

In the liquid crystal display device, a gray scale is expressed by adjusting the amount of light transmitted from the backlight unit to the degree of deflection of the liquid crystal according to the amount of charge charged in the pixel due to the voltage difference applied to the pixel electrode formed on the panel and the common electrode. It is a display device.

In addition, since the liquid crystal display is a display device having a hold type light emitting characteristic using light emitted from the backlight unit, motion blurring (deterioration of image contour) occurs in the process of representing a moving image, and display quality is deteriorated.

One of methods for preventing motion blur (motion picture contour degradation) of a moving image display is a method of driving input data at a high frequency, for example, a frequency of 120 Hz. As the data switching frequency is increased in the process of driving at a frequency of 120 Hz, the heat generation temperature of the data driver integrated circuit (IC) is increased.

The heat generation of the data driver IC may affect the operation characteristics of the driving elements formed in the data driver IC or damage it in severe cases. As a result, a malfunction of the data driver IC, such as a malfunction, is caused.

An object of the present invention is to provide a liquid crystal display device that can improve the heat problem of the data driver IC.

In order to achieve the above object, the liquid crystal display device according to the present invention comprises a liquid crystal panel comprising a plurality of pixels in the form of a matrix; (N + 1) data lines connected to n pixel columns defined by a plurality of pixels; A plurality of data driver ICs for driving the data lines are included, and the first data line and the (n + 1) th data line are supplied with the pixel electrode through one output channel.

In addition, a liquid crystal panel including a plurality of pixels in a matrix form as an embodiment of the present invention; The first data line connected to the pixels in the odd rows of the first pixel column; The kth data line (2 ≦ k ≦ m) connected to the pixels in the odd row of the kth pixel column and the pixels in the even row of the (k-1) th pixel column; And the (n + 1) th data line connected to the pixels of the even row of the nth pixel column, wherein the first and (n + 1) th data lines drive the liquid crystal display device sharing the output channel of the drive IC. The method includes applying a pixel voltage of a first polarity to a data line in an odd column; And applying a pixel voltage of a second polarity opposite to the first polarity to the data lines of the even-numbered column.

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

1 is a view showing a liquid crystal display device according to the present invention.

Referring to FIG. 1, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel 2 in which pixels are formed at intersections of data lines DL and gate lines GL, and a gate integrated circuit for driving gate lines. A data driver 4 including a gate driver 6 including a plurality of data drivers, a plurality of data driver ICs 14 supplying pixel data to data lines, and a data driver 4 and a gate driver 6, respectively. A timing controller 8 is provided to control the driving timing and to supply data corresponding to the selected output channel to each of the plurality of data integrated circuits 14.

In the liquid crystal panel 2, the gate lines GL1 to GLn and the data lines DL1 to DLm cross each other. The pixel is defined by the intersection of the gate lines GL1 to GLn and the data lines DL1 to DLn + 1. The pixel may include a thin film transistor TFT and a pixel electrode.

Therefore, pixels for one line are selected by switching control of the thin film transistor, and pixel reports are supplied to the selected pixels to display an image.

The timing controller 8 controls the gate control signals GSP, GSC, and GOE and the data control signals SSP, SSC, SOE, and POL using the synchronization signals V and H supplied from a video card (not shown). Occurs. The gate control signals GSP, GSC, and GOE are supplied to the gate driver 6 to control the gate driver, and the data control signals SSP, SSC, SOE, and POL are supplied to the data driver 4 to provide data. Take control of the driver. In addition, the timing controller 8 aligns the pixel data VD and supplies it to the data driver 4.

The gate driver 6 sequentially drives the gate lines GL1 to GLm. For this purpose, the gate driver 6 has a plurality of gate ICs (not shown).

The data driver 4 supplies the pixel signals for one line to the data lines DL1 to DL (m + 1) every horizontal period. For this purpose, the data driver 4 has a plurality of data drive ICs 14.

A structure in which a data line is connected to a pixel corresponding to a data drive IC according to an exemplary embodiment of the present invention will be described with reference to FIG. 2.

Each of the data drive ICs 14 is mounted on a tape carrier package (hereinafter referred to as "TCP") 10. The output channels 1ch to mch of the data drive ICs 14 are connected to the data lines DL1 to DL (m + 1) via the TCP pad 26, the data link line 22, and the data pad 20. Is electrically connected).

The first through m + 1 data lines for supplying the pixel signal are connected to the pixel in the following manner.

The first data line is connected to the pixels in the odd rows of the first pixel column.

The second to m th data lines are alternately connected to the left and right pixels based on each data line. That is, the second to mth data lines are connected to pixels in the odd row in the 'j'-th pixel column, and connected to pixels in the even-numbered row in the' j-1'-th pixel column.

The (m + 1) data line is connected to the pixels in the even row of the m th pixel column.

The first to mth output channels 1ch to mch and the first to mth data lines for supplying pixel electrodes to the pixels formed by the number of first to mth lines are as follows.

The first to m th data lines are connected to the first to m th output channels 1ch to mh, respectively. The (m + 1) th data line shares the output channel 1ch with the first data line.

That is, as shown in FIG. 2, the TCP pad 26 connected to the first output channel 1ch and the data pad 20m of the (m + 1) th data line are connected through TCP circuit wiring.

Alternatively, although not shown in the drawing, a method of forming a TCP pad separate from the TCP pad connected to the first output channel and connecting the data pad of the (m + 1) th data line may be used.

The driving method of the liquid crystal display according to the present invention will be described with reference to FIGS. 1 to 3.

The gate driver 6 sequentially drives the gate lines GL. For this purpose, the gate driver 6 has a gate driver IC. The gate driver ICs sequentially drive the gate lines GL connected thereto by the control from the timing controller 8. In other words, the gate ICs sequentially supply the gate high voltage VGH to the gate lines GL in response to the gate control signals GSP, GSC, and GOE supplied from the timing controller 8.

The data driver 4 supplies the pixel signals for one line to the data lines DL1 to DL (m + 1) every horizontal period. The data drive ICs 14 supply pixel signals to the data lines DL1 to DL (m + 1) in response to the data control signals SSP, SSC, SOE, and POL supplied from the timing controller 8. .

The data drive ICs 14 convert the pixel data VD into positive or negative pixel signals in response to the polarity control signal POL. That is, data is converted into a pixel signal having a polarity pattern by the inversion method and supplied to the data lines DL1 to DL (m + 1), whereby polarities opposite to the odd and even data lines are obtained. The pixel signal is applied.

In particular, the (m + 1) th data line is supplied with the pixel voltage through the first output channel 1ch. This is because the first data line is connected only to the odd pixel and the (m + 1) data line is connected only to the even pixel, so that the first data line and the (m + 1) data line are not simultaneously supplied with the pixel electrode. The output channel can be shared.

In the liquid crystal display device configured as described above, the pixel voltage inverted in units of frames may be supplied to each data line. For example, a positive pixel voltage may be supplied to each data line during the first frame, and a negative pixel voltage may be supplied to each data line during the second frame.

In this case, during the first frame, the positive pixel voltage is supplied to the odd-numbered pixel of the even-numbered pixel column in the first gate line GL1, and to the even-numbered pixel of the odd-numbered pixel column in the second gate line GL2. A positive pixel voltage can be supplied.

Therefore, while the data driver IC 14 supplies the pixel voltage in the line inversion method, each pixel can be driven in the inversion method as shown in FIG. Therefore, problems such as afterimages can be solved.

In addition, as described above, the polarity of each data line is changed from frame to frame. That is, there is no need to use a high switching frequency because there is no need to change the polarity on every line. Accordingly, it is possible to improve the heat generation problem caused by using a high switching frequency.

In particular, the pixel voltage applied to the first (m + 1) data line is outputted with the first data line in the process of forming (m + 1) data lines to drive the pixels formed by the number of m lines as described above. Since the channels are shared, no additional data output channel is required.

The above-described embodiment has described the panel structure and the driving method in the process of driving the pixels assigned to each data drive IC.

A general liquid crystal display device uses a plurality of data drive ICs, and in the case of using a plurality of data drive ICs, the panel may be formed as shown in FIG. 4.

M-th data lines are connected to the first and second data driver ICs 14a and 14b, and (m + 1) -th data lines are connected to the last data driver IC 14L. At this time, the first output channel of the second data driver IC 14b is simultaneously connected to the first data line and the (n + 1) th data line.

In the first data driver IC 14a, the first data line is connected to the pixels in the odd rows of the first pixel column.

Further, the k-th data line (2≤k≤m) of the first data driver IC 14a is connected to the pixels of the odd row of the kth pixel column and the pixels of the even row of the (k-1) th pixel column.

The (m + 1) th data line is connected to the pixels in the even row of the nth pixel column.

As described above, at the boundary between the first and second data driver ICs 14a and 14b, the previous pixel column and the current pixel column share one data line, thereby reducing the number of data lines and thus reducing the cost.

In particular, in the case of using a large number of data ICs, such as a large screen, the number of data lines can be further reduced, which is expected to greatly reduce the cost.

As described above, according to the liquid crystal display and the driving method according to the present invention, since the image is expressed like the dot inversion method without increasing the switching frequency, it is possible to solve the heat problem while improving the display quality.

In particular, since the output channel of the data drive IC is not added while configuring an additional data line for driving according to the present invention, the output voltage does not increase. There is no need to fabricate new data drive ICs, increasing the cost of manufacturing.

According to the present invention, since the previous pixel column and the current pixel column of the boundary between the data ICs share one data line, the cost can be reduced by reducing the number of data lines.

Although the present invention has been described with reference to the embodiments, those skilled in the art may variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. You will understand.

Claims (10)

A liquid crystal panel including a plurality of pixels in a matrix form; A plurality of data lines connected to a plurality of pixel columns defined by the plurality of pixels; One or more data driver ICs connected to the plurality of data lines, each for driving n pixel columns; The n pixel columns are driven by (n + 1) data lines, and the first data line and the (n + 1) th data line are supplied with a pixel electrode through one output channel. LCD display device. The method of claim 1, N output pads respectively formed on the data driver IC output channels; (N + 1) data pads formed on the first to (n + 1) th data lines, respectively, And the first output pad is connected to the first and (n + 1) th data pads. The method of claim 2, And the first output pad and the (n + 1) data pad are connected to circuit boards patterned on a flexible film. The method according to any one of claims 1 to 3, The first data line is connected to the pixels of the odd row of the first pixel column. The k-th data line (2≤k≤m) is connected to the pixels of the odd-numbered row of the k-th pixel column and the pixels of the even-numbered row of the (k-1) th pixel column. And the (n + 1) th data line is connected to the pixels in the even row of the nth pixel column. A liquid crystal panel including a plurality of pixels in a matrix form; (N + 1) data lines connected to n pixel columns defined by the plurality of pixels; A plurality of data driver ICs for driving the data lines, And the first data line and the (n + 1) th data line are supplied with a pixel electrode through one output channel. The method of claim 5, wherein The first data line is connected to the pixels of the odd row of the first pixel column. The k-th data line (2≤k≤m) is connected to the pixels of the odd-numbered row of the k-th pixel column and the pixels of the even-numbered row of the (k-1) th pixel column. And the (n + 1) th data line is connected to the pixels in the even row of the nth pixel column. The method of claim 6, The first data line of the i th data driver IC (3≤i) And a pixel in the even row of the last pixel column corresponding to the (i-1) th data driver IC and a pixel in the odd row of the first pixel column corresponding to the i th data driver IC. A liquid crystal panel including a plurality of pixels in a matrix form, a plurality of data lines connected to a plurality of pixel columns defined by the plurality of pixels, and a plurality of data lines connected to the plurality of data lines, each driving n pixel columns And one or more data driver ICs, wherein the n pixel columns are driven by the (n + 1) data lines, and the first data line and the (n + 1) th data line are one output. A method of driving a liquid crystal display device receiving a pixel electrode through a channel, Applying pixel voltages of opposite polarities to the liquid crystal cells in rows adjacent to the first and (n + 1) data lines; And applying pixel voltages of opposite polarities to the liquid crystal cells in columns adjacent to the first and (n + 1) th data lines. A liquid crystal panel including a plurality of pixels in a matrix form; The first data line connected to the pixels in the odd rows of the first pixel column; The kth data line (2 ≦ k ≦ m) connected to the pixels in the odd row of the kth pixel column and the pixels in the even row of the (k-1) th pixel column; And the (n + 1) th data line connected to the pixels of the even row of the nth pixel column, wherein the first and (n + 1) th data lines drive the liquid crystal display device sharing the output channel of the drive IC. In the way, Applying a pixel voltage of a first polarity to the data lines of the odd column; And applying a pixel voltage having a second polarity opposite to the first polarity to the data lines of the even-numbered column. The method of claim 9, Applying a pixel voltage to the first data line Applying a pixel voltage to the 'j' row first column pixels; And applying a pixel voltage to the m-th column pixels of the 'j + 1' rows.

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