KR100361469B1 - Apparatus of Driving Liquid Crystal Display Device and Method Thereof - Google Patents

Abstract

The present invention relates to a liquid crystal display device driving apparatus and method configured to reduce manufacturing costs and to realize high resolution.

In the liquid crystal display device driving apparatus and method thereof of the present invention, a scan signal is sequentially supplied to a plurality of gate lines to which adjacent pixels are connected vertically, and a pair is selected between the pixels adjacent to the left and right sides simultaneously selected by the scan signal. The data of polarities opposite to each other are supplied to the data lines arranged so as to supply data of opposite polarities to pixels adjacent to each other in the vertical direction and the left and right directions.

Description

Apparatus of Driving Liquid Crystal Display Device and Method Thereof}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a driving method thereof, and more particularly, to a liquid crystal display device driving device and a method configured to reduce manufacturing costs and to realize high resolution.

In general, a liquid crystal display (hereinafter referred to as "LCD") displays an image by adjusting a transmission amount of a light beam to correspond to an image signal. To this end, the liquid crystal panel includes a plurality of liquid crystal cells arranged in an m × n matrix and a plurality of control switches, that is, thin film transistors (“TFTs”) for switching image signals to be supplied to each of the liquid crystal cells. ).

On the other hand, the LCD is progressing in high resolution to meet the high resolution demand of the user. LCDs can be classified into XGA, SXGA (Super-XGA), and UXGA (Ultra-XGA) depending on the resolution. For example, UXGA has a resolution of 1200 × 1600. According to this trend, in the case of UXGA mode, the dot clock is faster and the period of one horizontal synchronization period (1H) is shorter to realize high resolution than the XGA mode. In other words, the driving frequency of the LCD is increased. In this case, since a driving integrated circuit (D-IC) hereinafter corresponding to a high driving frequency must be used, a problem arises in that the implementation and manufacturing cost of the driving circuit increases. In order to solve this problem, a liquid crystal panel driving apparatus as shown in FIG. 1 has been proposed.

Referring to FIG. 1, a conventional liquid crystal display device includes a liquid crystal panel 10 displaying an image corresponding to an image signal, and a first source driving block 12 formed on the liquid crystal panel 10 to apply an image signal. ), A second source driving block 14 formed below the liquid crystal panel 10 to apply an image signal, and a first to apply scanning signal to the first to n / 2 gate lines GL1 to GLn / 2. A first gate driving block 22 and a second gate driving block 24 for applying a scanning signal to the (n / 2) +1 th to n th gate lines are provided. In the conventional liquid crystal display, the screen is divided into two screens by using two gate driving blocks 22 and 24. In detail, in the case of UXGA, the first gate driving block 22 sequentially applies the scanning signals to the first to 600th gate lines GL1 to GL600. In addition, the second gate driving block 24 sequentially applies the scanning signals to the 601 th to 1200 th GL601 thru GL1200. In this case, scanning signals are simultaneously applied to the first gate line GL1 and the 601 gate line GL601. That is, after dividing the screen into two, each divided screen is driven simultaneously. To this end, the first and second source driving blocks 12 and 14 are connected to a frame memory (not shown). In this case, since the frame memory needs to store video signals of one frame or two frames, a capacity of about 12 Mbytes is required, thereby increasing the manufacturing cost. In addition, a problem of showing the boundary of the divided part on the screen has been derived. As a result, a new method capable of reducing manufacturing costs and implementing high resolution is required.

Accordingly, an object of the present invention is to provide a liquid crystal panel driving apparatus and a method configured to enable high resolution.

1 is a view showing the configuration of a conventional liquid crystal display element driving apparatus.

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

3 is a diagram showing the configuration of a liquid crystal display element driving apparatus of the present invention.

4A and 4B are timing diagrams showing driving timings of video signals.

FIG. 5 is a waveform diagram for comparing driving timing between a conventional liquid crystal display device and a liquid crystal display device of the present invention; FIG.

6A and 6B are diagrams for explaining a driving method for driving the liquid crystal display of the present invention in a one-line dot inversion method.

7A and 7B are diagrams for explaining a driving method for driving the liquid crystal display device of the present invention in a 2-line dot inversion method.

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

<Description of Symbols for Main Parts of Drawings>

10,30: liquid crystal panel 12,14,42,44: source driving block

22, 24, 52: gate drive block 60: controller

62: line memory 64: timing controller

72: pixel electrode 74: thin film transistor

In order to achieve the above object, the liquid crystal display device driving apparatus according to the embodiment of the present invention is arranged to be adjacent to the left and right adjacent to the plurality of gate lines for supplying the scan signal, and vertically arranged around the gate line And a plurality of data lines arranged in pairs between the pixels left and right adjacent to each other and controlled by the gate signal from the gate line to supply data having polarities opposite to each other to the left and right adjacent pixels. The pixels having opposite polarities are supplied to the pixels adjacent in the vertical direction and the left and right directions.

According to an exemplary embodiment of the present invention, a method of driving a liquid crystal display device includes sequentially supplying a scan signal to a plurality of gate lines to which pixels adjacent to each other in the upper and lower sides are sequentially connected, and pixels simultaneously selected by the scan signal and adjacent to the left and right. And supplying data of opposite polarities to data lines arranged in pairs therebetween such that data of opposite polarities are supplied to adjacent pixels in up, down, left and right directions.

Other objects and features of the present invention in addition to the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.

With reference to Figures 2 to 7 will be described a preferred embodiment of the present invention.

2 and 3, the liquid crystal panel of the present invention is shown in detail. As illustrated in FIG. 2, TFTs 74 formed on upper and lower lines are connected to the nth gate line GLn, respectively. That is, the TFTs 74 corresponding to the two lines are connected to one gate line. At this time, when the scanning signal is transmitted to the n-th gate line GLn, two lines of TFTs 74 symmetrically provided on the upper and lower lines of the n-th gate line are driven simultaneously. In addition, the n + 1th gate line GLn + 1 is also connected to the TFTs 74 of two lines. Meanwhile, m TFTs 74 located at an upper line of the gate line are connected to data lines DD0 to DDm of the second source driving block 44 to drive two lines at the same time. That is, one line of image signal transmitted from the second source driving block 44 is applied to the TFTs positioned on the upper line with respect to the nth gate line. In addition, the m TFTs located at the lower line of the gate line are connected to the data lines UD0 to UDm of the first source driving block 42, respectively. That is, one line of image signal transmitted from the first source driving block 42 is applied to the TFTs positioned on the lower line with respect to the gate line. At this time, m data lines of the first source driving block 42 and m data lines of the second source driving block 44 are arranged to be shifted by one pixel. In this case, the second source driving block 44 TFTs corresponding to the radix line of the liquid crystal panel 30 are connected to the data line, and TFTs corresponding to the even line of the liquid crystal panel 30 are connected to the data line of the first source driving block 42.

Referring to FIG. 3, the liquid crystal display device driving apparatus of the present invention temporarily stores an image signal in line units, and controls the timing of each part, and a line-by-line image stored in the controller unit 60. The first and second source driving blocks 42 simultaneously outputting signals to the odd-numbered and even-numbered lines on the liquid crystal panel 30 and the synchronization signal output from the controller unit 60. A gate driving block 52 for sequentially driving the gate line is provided. The controller unit 60 includes a timing controller 64 for controlling timing of each part in response to the horizontal (Hsync) and vertical synchronization signals (Vsync), and a line memory (62) for temporarily storing image signals in line units. do. The line memory 62 temporarily stores video signals corresponding to two lines as shown in FIG. 4A. The video signal stored in the line memory 62 is transmitted one line to each of the first and second source driving blocks 42 and 44 as shown in FIG. 4B. In this case, an image signal corresponding to one line corresponding to the even-numbered line on the liquid crystal panel 30 is applied to the first source driving block 42, and the timing diagram of the image signal is shown in (a) of FIG. 4B. It is. The second source driving block 44 is applied with an image signal corresponding to one line corresponding to the odd-numbered line on the liquid crystal panel 30, and the timing diagram of the image signal is shown in FIG. 4B (b). At this time, when the gate start pulse GSP is transmitted from the timing controller 64 to the gate driving block 52, scanning is performed on two lines of TFTs connected to the nth gate line GLn in the gate driving block 52. Signal is applied. At this time, the first and second source driving blocks 42 and 44 simultaneously apply an image signal to the odd and even lines on the liquid crystal panel. As a result, two lines are simultaneously displayed on the screen. In addition, the gate driving block 52 outputs a scanning signal to the n + 1 th gate line GLn + 1 when the gate shift clock GSC is at a high level. By the same process, the scanning signals are sequentially transmitted to the gate lines. As described above, in the liquid crystal display device driving apparatus of the present invention, two lines of TFTs are connected to one gate line so that two lines on the liquid crystal panel 30 are driven simultaneously. Accordingly, the number of gate integrated circuits (hereinafter referred to as " IC ") constituting the gate driving block 52 is reduced to 1/2, thereby reducing the cost. In addition, since the existing frame memory is replaced with the line memory, the cost is reduced.

On the other hand, referring to Figure 5 is a waveform diagram for comparing the drive timing of the conventional liquid crystal panel driver and the liquid crystal panel driver of the present invention. The conventional gate start pulse (GSP) and gate shift clock (GSC) waveforms shown in FIG. 5 (a) and the gate start pulse (GSP) and gate shift clock (GSC) of the present invention shown in FIG. 5 (b). It can be seen from the waveform that the driving frequency of the present invention is lowered twice. As such, when the driving frequency is low, it becomes possible to use a relatively low speed driving integrated circuit.

Meanwhile, the method of driving the liquid crystal display device of the present invention will be described with reference to FIGS. 6A to 7B.

6A and 6B are views for explaining a method of driving the liquid crystal display of the present invention in a one-line dot inversion method. As shown in FIG. 6A, the image signals are alternately displayed as the positive (+) and the negative (-) appear alternately from the upper left liquid crystal cell to the right liquid crystal cell and to the lower liquid crystal cells. The liquid crystal cells on the liquid crystal panel 30 are respectively supplied. To implement this, signals having a waveform as shown in FIG. 6B are applied to the liquid crystal panel 30. In detail, when a scanning signal having a high level is applied to the nth gate line for 2H, the left side of the 0th to mth data lines DD0 to DDm connected to the second source driving block 44 is applied. As the liquid crystal cell progresses from the liquid crystal cell to the right liquid crystal cell, an image signal is applied such that the positive polarity (+) and the negative polarity (−) appear alternately. Negative polarity (-) and positive polarity (+) alternate with the liquid crystal cell on the left side from the liquid crystal cell on the left side to the zeroth to mth data lines UD0 to UDm connected to the first source driving block 42. The video signal is applied to appear. At this time, the zeroth data line UD0 connected to the first source driving block 42 and the zeroth data line DD0 connected to the second source driving block 44 have different polarities. That is, when a scanning signal having a high level is applied to the n-th gate line GLn for 2H, the image signal is alternately displayed in the negative and negative polarities of the m data lines provided above the gate line. Is applied to the m data lines provided under the gate line, and the image signal is applied alternately with the positive (+) and the negative (-). When a signal having such a waveform is applied, the liquid crystal panel is driven by a one-line dot inversion method. In this case, the one-line dot inversion method improves image quality. In addition, the scanning signals applied to each data line are inverted in polarity every 2H. Meanwhile, when a scanning signal having a high level is applied to the n + 1 th gate line for 2H, m data lines connected to the first and second source driving blocks 42 and 44 are 1-line dot inversion as described above. The scanned signal is applied.

7A and 7B are views for explaining a method of driving the liquid crystal display device of the present invention by a two-line dot inversion method. As shown in FIG. 7A, the image signals are alternately applied to the liquid crystal cells on the liquid crystal panel 30 so that the positive and negative polarities alternate with each other. In addition to the supply, image signals are supplied to the liquid crystal cells on the liquid crystal panel 30 so that the positive (+) and the negative (−) appear alternately as the second liquid crystal cells progress to the lower liquid crystal cells. In order to implement this, signals having a waveform as shown in FIG. 7B are applied to the liquid crystal panel 30. In detail, when the scanning signal having the high level is applied to the nth gate line for 2H, the 0 th to m th data lines UD0 to the first and second source driving blocks 42 and 44 are connected. UDm, DD0 to DDm) is applied to the video signal so that the positive (+) and the negative (-) appear alternately as the liquid crystal cell on the left side proceeds to the liquid crystal cell on the right side. At this time, the zeroth data line DD0 connected to the first source driving block 42 and the zeroth data line UD0 connected to the second source driving block 44 have the same polarity. That is, when a scanning signal having a high level is applied to the n-th gate line GLn for 2H, negative (-) and positive (+) appear alternately on m data lines provided above and below the gate line. The video signal is applied. When a signal having such a waveform is applied, the liquid crystal panel is driven by a 2-line dot inversion method. In addition, the scanning signals applied to each data line are inverted in polarity every 2H. On the other hand, when a scanning signal having a high level is applied to the n + 1 th gate line for 2H, m data lines connected to the first and second source driving blocks 42 and 44 are 2-line dot inversion as described above. The scanned signal is applied. As described above, the liquid crystal display device of the present invention is driven by a one-line or two-line dot inversion method to prevent flicker and to prevent deterioration of the liquid crystal, thereby improving image quality.

8 is a partial view of a liquid crystal panel according to another exemplary embodiment of the present invention. In the liquid crystal panel of FIG. 8, the TFTs 74 corresponding to the upper and lower lines, that is, the two lines, are connected to the nth gate line GLn. Accordingly, two lines of TFTs 74 symmetrically provided on the upper and lower lines of the n-th gate line GLn are driven simultaneously by the scanning signal applied to the n-th gate line GLn. In order to drive two lines at the same time, the TFTs 74 positioned above the n-th gate line GLn and the TFTs 74 positioned below are connected to different data lines, respectively. In this case, two lines of TFTs 74 positioned between the nth gate line GLn and the n-th gate line GLn-1 of the upper portion adjacent thereto are connected to the second source driving block 44. Drives are connected to the data lines DD0 to DDm, respectively. On the other hand, two lines of TFTs 74 positioned between the nth gate line GLn and the lower n + 1th gate line GLn + 1 adjacent thereto are connected to the first source driving block 42. It is connected to each of the data lines UD0 to UDm and driven.

As described above, the liquid crystal display device driving apparatus and method of the present invention drive at least two scan lines for at least two lines at the same time, there is an advantage that can be implemented in high resolution. In addition, the liquid crystal display device driving apparatus and method of the present invention have the advantage that the line memory can be used and the number of gate driving ICs is reduced to 1/2, thereby reducing the manufacturing cost.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present 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.

Claims (14)

A plurality of gate lines for supplying a scan signal, Pixels arranged vertically adjacent to the gate line and adjacent to the left and right and controlled by a gate signal from the gate line; A plurality of data lines arranged in pairs between the left and right adjacent pixels to supply data having polarities opposite to each other to the left and right adjacent pixels, And data having polarities opposite to each other are supplied to the pixels adjacent in the vertical direction and the horizontal direction. The method of claim 1, Pixels located above each of the gate lines respond to data from an odd data line. And lower pixels centering each of the gate lines respond to data from even-numbered data lines. The method of claim 1, And the pixels positioned between the adjacent gate lines respectively respond to data from different data lines. The method of claim 3, wherein Pixels located between the even-numbered gate line and the upper odd-numbered gate line adjacent thereto respond to data from the odd-numbered data line, And pixels located between the even-numbered gate line and the lower odd-numbered gate line adjacent thereto respond to data from the even-numbered data line. The method of claim 1, A data driver for supplying different data to each of the pixels through the plurality of data lines; A gate driver for sequentially supplying the scan signals to the plurality of gate lines; And a control unit for controlling the data driver and the gate driver. The method of claim 5, And the gate driver sequentially supplies scan signals to the gate lines at two horizontal synchronization signal cycles. The method of claim 5, And the data driver supplies two lines of data to the plurality of data lines in synchronization with the scan pulse. The method of claim 5, And the data driver supplies data having opposite polarities to pixels adjacent to the upper and lower sides of the gate line. The method of claim 5, And the data driver supplies data having opposite polarities to pixels adjacent to the left and right around the data line. Sequentially supplying scan signals to a plurality of gate lines to which adjacent pixels are connected; The data of polarity opposite to each other is supplied to the data lines simultaneously selected by the scan signal and arranged in pairs between the adjacent pixels to the left and right, so that the data of the polarity opposite to each other in the vertical direction and the left and right pixels are provided. And supplying the liquid crystal display device. The method of claim 10, And the scan signal is sequentially supplied to the gate lines at two horizontal synchronization signal cycles. delete delete delete