KR101351388B1 - liquid crystal display apparatus and driving method thereof - Google Patents

Abstract

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 and a driving method thereof which can reduce production costs and improve display quality.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes a liquid crystal panel including pixel cells formed in regions defined by a plurality of gate lines and a plurality of data lines, a gate driver applying a driving signal to the gate lines, and A data driver is provided to apply image data to a data line, and each of the pixel cells is connected to an adjacent gate line and is connected to different data lines on a horizontal line.

The liquid crystal display according to the embodiment of the present invention can reduce the manufacturing cost by reducing the number of expensive data drive ICs compared to the case, and also improve display quality by preventing poor image quality due to charge variation of the image data signal. .

Source drive IC, inversion drive method, vertical stripe, horizontal stripe

Description

Liquid crystal display apparatus and driving method thereof

1 is a view schematically showing a general liquid crystal display device.

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

3 is a diagram illustrating a gate driving signal applied to a liquid crystal display according to a first embodiment of the present invention.

4 is a diagram illustrating an input sequence of image data applied to a liquid crystal display according to a first exemplary embodiment of the present invention.

5 is a view showing a polarity change of image data applied to the liquid crystal display according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating a super pixel gray test pattern of a liquid crystal display according to a first exemplary embodiment of the present invention. FIG.

FIG. 7 illustrates a liquid crystal display according to a second exemplary embodiment of the present invention. FIG.

8 is a diagram illustrating a gate driving signal applied to a liquid crystal display according to a second exemplary embodiment of the present invention.

9 is a diagram illustrating an input sequence of image data applied to a liquid crystal display according to a second exemplary embodiment of the present invention.

FIG. 10 is a view illustrating a polarity change of image data applied to a liquid crystal display according to a second exemplary embodiment of the present invention. FIG.

FIG. 11 illustrates a gate driving signal applied to a liquid crystal display according to a second exemplary embodiment of the present invention. FIG.

FIG. 12 is a diagram illustrating an input sequence of image data applied to a liquid crystal display according to a second exemplary embodiment of the present invention. FIG.

FIG. 13 is a view illustrating a polarity change of image data applied to a liquid crystal display according to a second exemplary embodiment of the present invention. FIG.

<Explanation of symbols for the main parts of the drawings>

1, 100, 200: liquid crystal display device 10, 110, 210: liquid crystal panel

20, 120, 220: data driver 30, 130, 230: gate driver

40, 140, 240: timing controller

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 and a driving method thereof which can reduce production costs and improve display quality.

In today's information society, display devices are more important than ever as visual information transfer media, and many kinds of flat panel displays have been developed.

The flat panel display device includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an electroluminescence (EL) .

2. Description of the Related Art Generally, a liquid crystal display device is in a trend of widening its application range due to features such as light weight, thinness, and low power consumption driving. According to this tendency, the liquid crystal display device is used as a portable computer such as a notebook PC, an office automation device, an audio / video device, an indoor and outdoor advertisement display device, etc. With recent achievements of mass production technology and research and development, It is rapidly developing.

2. Description of the Related Art Conventionally, a liquid crystal display device displays an image by adjusting a light transmittance of liquid crystal cells according to a video signal. Such a liquid crystal display device has a liquid crystal panel (Liquid Crystal Display Panel) in which the liquid crystal cells are arranged in a matrix form between two glass substrates to display an image, and a backlight unit (Back Light Unit) for irradiating light to the liquid crystal panel. And a driving device for applying a driving signal for driving the liquid crystal panel.

1 is a schematic view of a general liquid crystal display device.

Referring to FIG. 1, a general liquid crystal display device 1 includes a liquid crystal panel 10 including pixel regions formed in regions defined by a plurality of gate lines GL1 to GLm and a plurality of data lines DL1 to DLn. ), The gate driver 30 sequentially supplying the gate driving signals to the plurality of gate lines GL1 to GLm, and the input image data R, G, and B to be synchronized with the gate driving signal GCS. The data driver 20 to be supplied to the plurality of data lines DL1 to DLn and the image data R, G, and B from the outside are converted and aligned and supplied to the data driver 20 and the gate driver ( 30 and a timing controller 40 for controlling the driving of the data driver 20.

Although not shown, a backlight unit for irradiating light to the liquid crystal panel 10, an inverter for applying an AC voltage and a current to the backlight unit, and a reference for generating a reference gamma voltage to supply the data driver 20. The device further includes a gamma voltage generator and a voltage generator for supplying a common voltage Vcom to a common voltage of the liquid crystal panel 10 and a driving voltage for driving each device.

The liquid crystal panel 10 includes a transistor array substrate and a color filter array substrate bonded to each other, a spacer for maintaining a constant cell gap between the two array substrates, and a liquid crystal filled in a space provided by the spacer.

The liquid crystal panel 10 includes a thin film transistor (hereinafter referred to as TFT) formed in a pixel region defined by m gate lines and n data lines, and a liquid crystal cell connected to a TFT.

The TFT supplies an analog video signal from the data lines DL1 to DLn to the liquid crystal cell in response to the gate driving signal from the gate lines GL1 to GLm.

Since the liquid crystal cell includes the common electrode facing the liquid crystal and the pixel electrode connected to the TFT, the liquid crystal cell can be equivalently expressed by the liquid crystal capacitor Clc. The liquid crystal cell includes a storage capacity Cst for maintaining the analog video signal charged in the liquid crystal capacitor Clc until the next analog video signal is charged. The common voltage Vcom is supplied to the common electrode of the liquid crystal cell.

The TFT includes a gate electrode connected to the gate lines GL1 to GLm, a source electrode connected to the data lines DL1 to DLn, and a drain electrode connected to the pixel electrode.

Red (R), green (G), and blue (B) color filters are vertically arranged on the color filter array substrate of the liquid crystal panel 10 to form a matrix.

The timing controller 40 aligns the image data R, G, and B input from the digital video card in units of frames, and supplies the aligned frame of image data to the data driver 20.

In addition, the timing controller 40 uses the dot clock DLCK, the data enable signal DE, and the horizontal and vertical synchronization signals Hsync and Vsync input from the outside to control the data control signal DCS and the gate control signal ( GCS) is generated to control driving timing of each of the data driver 20 and the gate driver 30.

Here, the data control signal DCS includes a source shift clock (SSC), a source start pulse (SSP), a polarity control signal (POL), and a source output enable (SOE) And the gate control signal GCS includes a gate start pulse GSP, a gate shift clock GSC and a gate output enable signal GOE.

The gate driver 30 includes a shift register that sequentially generates a gate driving signal (gate scan pulse) in response to the gate control signal GCS from the timing controller 40. The gate driver 30 sequentially applies the gate driving signal to the gate lines GL1 to GLm in response to the gate control signal GCS input from the timing controller 40. The TFT connected to GLm) is turned on. In this case, the gate driver 30 determines the high level voltage and the low level voltage of the gate driving signal according to the input gate high voltage VGH and the gate low voltage VGL.

In response to the data control signal DCS supplied from the timing controller 40, the data driver 20 outputs an analog video signal corresponding to the line for each period in which the gate driving signal is supplied, the data lines DL1 to DLn. To feed. In this case, the data driver 20 may invert the polarity of the analog video signal supplied to the data lines DL1 to DLn in response to the polarity control signal POL.

A general liquid crystal display device 1 having such a configuration includes red (R), green (G), and blue (B) color filters formed in the liquid crystal panel 10 in a vertical stripe and adjacent red in the horizontal direction. Color pixels of R), green (G), and blue (B) are combined to form a unit pixel. In order to display the resolution of (m × n), the liquid crystal display device 1 requires 3n data lines DL and m gate lines as shown in FIG. 1.

In order to supply image data to the 3n data lines, a large number of expensive source drive ICs are required, thereby increasing the manufacturing cost of the liquid crystal display. In order to improve this problem, a structure for forming a data line as a common line has been proposed. However, such a structure has a disadvantage in that image quality is degraded during driving.

Accordingly, an LCD and a driving method thereof according to an exemplary embodiment of the present invention provide a liquid crystal display and a driving method thereof which can reduce production costs and improve display quality.

In order to achieve the above object, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel including a pixel cell formed in each region defined by a plurality of gate lines and a plurality of data lines, and a driving signal applied to the gate line. A gate driver to be applied and a data driver to apply image data to the data line, wherein each of the pixel cells is connected to an adjacent gate line and is connected to different data lines on a horizontal line.

A driving method of a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel including pixel cells formed in regions defined by a plurality of gate lines and a plurality of data lines, a gate driver for supplying a driving signal to the gate lines; A driving method of a liquid crystal display device including a data driver for supplying image data to the data line, the method comprising: applying a driving signal to each pixel cell connected to an adjacent gate line and connected to different data lines on a horizontal line And applying image data to each of the pixel cells in synchronization with the driving signal.

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

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

2 illustrates a liquid crystal display according to a first embodiment of the present invention.

Referring to FIG. 2, the liquid crystal display device 100 according to the first exemplary embodiment of the present invention may include pixels formed in regions defined by a plurality of gate lines GL1 to GLm and a plurality of data lines DL1 to DLn. The liquid crystal panel 110 including the region, the gate driver 130 which sequentially supplies the gate driving signal to the plurality of gate lines GL1 to GLm, and the input image data R, G, and B are gated. The data driver 120 converts and aligns the data driver 120 supplied to the plurality of data lines DL1 to DLn and the image data R, G, and B from the outside so as to be synchronized with the driving signal GCS. And a timing controller 140 for controlling the driving of the gate driver 130 and the data driver 120.

Although not shown, a backlight unit for irradiating light to the liquid crystal panel 110, an inverter for applying an AC voltage and a current to the backlight unit, and a reference for generating a reference gamma voltage to supply the data driver 120. The apparatus further includes a gamma voltage generator and a voltage generator for supplying a common voltage Vcom to the common voltage of the liquid crystal panel 110 and the driving voltage for driving each device.

The liquid crystal panel 110 of the liquid crystal display device 100 according to the first exemplary embodiment of the present invention is a transistor array substrate and a color filter array substrate bonded to each other, and a spacer for maintaining a constant cell gap between the two array substrates. And liquid crystal filled in the space provided by the spacer.

The liquid crystal panel 110 includes a TFT formed in a pixel region defined by m gate lines GL1 to GLm and n data lines DL1 to DLn, and a liquid crystal cell connected to the TFT.

The TFT supplies an analog video signal from the data lines DL1 to DLn to the liquid crystal cell in response to the gate driving signal from the gate lines GL1 to GLm.

Since the liquid crystal cell includes the common electrode facing the liquid crystal and the pixel electrode connected to the TFT, the liquid crystal cell can be equivalently expressed by the liquid crystal capacitor Clc. The liquid crystal cell includes a storage capacity Cst for maintaining the analog video signal charged in the liquid crystal capacitor Clc until the next analog video signal is charged. The common voltage Vcom is supplied to the common electrode of the liquid crystal cell.

The TFT includes a gate electrode connected to the gate lines GL1 to GLm, a source electrode connected to the data lines DL1 to DLn, and a drain electrode connected to the pixel electrode.

Red (R), green (G), and blue (B) color filters are horizontally arranged on the color filter array substrate of the liquid crystal panel 110.

Pixel cells of the same color are arranged in the horizontal direction through the arrangement of the color filters, and pixel cells of different colors are arranged in the vertical direction so that the pixel cells of red (R), green (G), and blue (B) are matrixed. Arranged in the form.

The timing controller 140 aligns the image data R, G, and B input from the digital video card in units of frames, and supplies the aligned image data in the frame units to the data driver 120.

In addition, the timing controller 140 uses the dot clock DLCK, the data enable signal DE, and the horizontal and vertical synchronization signals Hsync and Vsync, which are input from the outside, to control the data control signal DCS and the gate control signal ( GCS) is generated to control driving timing of each of the data driver 120 and the gate driver 130.

Here, the data control signal DCS includes a source shift clock (SSC), a source start pulse (SSP), a polarity control signal (POL), and a source output enable (SOE) And the gate control signal GCS includes a gate start pulse GSP, a gate shift clock GSC and a gate output enable signal GOE.

The gate driver 130 includes a shift register that sequentially generates a gate driving signal (gate scan pulse) in response to the gate control signal GCS from the timing controller 140. The gate driver 130 sequentially applies the gate driving signals to the gate lines GL1 to GLm in response to the gate control signal GCS input from the timing controller 140, thereby providing the respective gate lines GL1. The TFT connected to? GLm) is turned on. In this case, the gate driver 130 determines the high level voltage and the low level voltage of the gate driving signal according to the input gate high voltage VGH and the gate low voltage VGL.

In response to the data control signal DCS supplied from the timing controller 140, the data driver 120 outputs an analog video signal corresponding to a line corresponding to the data driving period DL1 to DLn every time the gate driving signal is supplied. To feed. In this case, the data driver 120 may invert the polarity of the analog video signal supplied to the data lines DL1 to DLn in response to the polarity control signal POL.

As the polarity inversion driving method for inverting the polarity of the analog video signals supplied to the data lines DL1 to DLn, the frame inversion system, the line inversion system, and the column inversion method ( Driving methods such as Column Inversion System) and Dot Inversion System are used.

The frame inversion driving method is driven by applying a signal having the same polarity to each pixel region of the liquid crystal panel during one frame and inverting the polarity of the signal applied to each pixel region during the previous frame during the next frame.

The line inversion driving method has a problem in that flicker such as a stripe pattern occurs between the horizontal lines due to the presence of crosstalk between the horizontal pixel areas, and the column inversion driving method uses the vertical pixel area. As crosstalk exists between them, a fricker phenomenon such as a stripe pattern occurs between vertical lines.

Accordingly, in order to solve the problems of the line inversion driving method and the column inversion driving method, a dot inversion driving method is proposed in which each pixel area and the adjacent pixel areas in the vertical direction are driven to have different polarities.

The dot inversion driving method provides an improved display quality and prevents deterioration of the liquid crystal layer compared to the line inversion driving method, the column inversion driving method, and the frame inversion driving method described above. It is widely applied to. The liquid crystal display device 100 according to the first exemplary embodiment of the present invention uses a two-dot inversion driving method in which two adjacent pixel areas in the vertical direction have inverted polarities in order to prevent cross talk, flicker, and low power consumption. Apply.

The reference gamma voltage generation unit (not shown) receives a high potential power supply voltage VDD to generate a positive reference gamma voltage and a negative reference gamma voltage to output the data to the data driver 120.

The backlight unit, not shown, is disposed on the rear side of the liquid crystal panel 110 and emits light by an AC voltage and a current supplied from an inverter (not shown) to irradiate light to each pixel of the liquid crystal panel 110.

The inverter converts the square wave signal generated therein into a triangular wave signal and compares the triangular wave signal with a DC power supply voltage (VCC) to generate a burst dimming signal proportional to the comparison result.

When the burst dimming signal determined according to the internal square wave signal is generated, the driving IC controlling the generation of the AC voltage and the current in the inverter controls the generation of the AC voltage and the current supplied to the backlight unit according to the burst dimming signal. .

The common voltage generator, which is not shown, receives the high potential power voltage VDD to generate the common voltage Vcom, and supplies the common voltage Vcom to the common electrodes of the liquid crystal cells Clc included in each pixel of the liquid crystal panel 110.

FIG. 3 is a diagram illustrating a gate driving signal applied to a liquid crystal display according to a first embodiment of the present invention, and FIG. 4 illustrates an input order of image data applied to the liquid crystal display according to the first embodiment of the present invention. It is a figure which shows.

The driving method of the liquid crystal display according to the first embodiment of the present invention will be described with reference to FIGS. 2 to 4.

The liquid crystal display device 100 according to the first exemplary embodiment of the present invention uses a TFT connected to pixel cells of red (R), green (G), and blue (B) arranged horizontally in one frame period. In order to sequentially turn on in the vertical direction, the gate driving signals are sequentially applied to the m gate lines GL1 to GLm from the first gate line GL1 to the mth gate line GLm. 3 illustrates a gate driving signal applied to the first to sixth gate lines GL1 to GL6 among the m gate lines GL1 to GLm.

When the first gate driving signal ① is applied to the first gate line GL1 during one frame period, the TFTs connected to the pixel cells of R11 to Rn1 and G11 to Gn1 are turned on.

Subsequently, when the second gate driving signal ② is applied to the second gate line GL2, the TFTs connected to the pixel cells of B11 to Bn1 and R12 to Rn2 are turned on.

Subsequently, when the third gate driving signal ③ is applied to the third gate line GL3, the TFTs connected to the pixel cells of G12 to Gn2 and B12 to Bn2 are turned on.

Thereafter, when the fourth to mth gate driving signals are applied to the fourth to nth gate lines GL4 to GLn, the TFTs connected to the respective gate lines are turned on to drive the respective pixel cells.

The pixel cells R11 to Rn1 and G11 to Gn1 driven by the first gate driving signal ① applied to the first gate line GL1 are respectively image data from the data lines DL1 to DLn connected thereto. Receive a signal.

In more detail, the R11 pixel cell is from the first data line DL1, the G11 pixel cell is from the second data line DL2, the R21 pixel cell is from the third data line DL3, and the G21 pixel cell is made from the first data line DL1. From the fourth data line DL4, the R31 pixel cell is from the fifth data line GL5, the G31 pixel cell is from the sixth data line GL6, and the Rn1 pixel cell is from the n-1 th data line DLn-1. The image is displayed by receiving the image data signal. That is, the plurality of pixel cells connected to the same gate line GL on the horizontal line receives an image data signal from different data lines.

The pixel cells driven by the respective gate driving signals applied to the second to mth gate lines GL2 to GLm are driven by the first gate driving signal ① applied to the first gate line GL1 described above. Like the pixel cells R11 to Rn1 and G11 to Gn1, the plurality of pixel cells connected to the same gate line GL on the horizontal line receive an image data signal from different data lines.

Each pixel cell that receives an image data signal from a data line connected to itself has three units of red (R), green (G), and blue (B) formed between two data lines facing each other. The input video signal is displayed.

The liquid crystal display according to the first exemplary embodiment of the present invention can reduce the number of expensive data drive ICs compared to the general liquid crystal display shown in FIG. 1 through the above-described configuration. This can reduce the manufacturing cost of the liquid crystal display device.

In the driving method of the liquid crystal display according to the first exemplary embodiment of the present invention, image data is applied to each of the data lines DL1 to DLn in the order shown in FIG. 4. At this time, the image data having the polarity as shown in FIG. 5 is input to each of the data lines DL1 to DLn so that the polarity is inverted by 2 dots in the vertical direction and 1 dots in the horizontal direction on the liquid crystal panel. do.

In the driving method of the general structure for reducing the data line, the sustain period (1H) of the gate driving signal is driven short. When the holding period 1H of the gate driving signal is shortened, a phenomenon in which the image data signal supplied through the data line is not charged may occur, thereby driving the gate driving signal by overlapping it.

However, when the gate driving signals overlap each other, the image data signal charged in the pixel cell is precharged, which may cause a poor image quality of the displayed image according to the charging order of the image data signal of the pixel cell. As a test pattern for checking the image quality defect, a super pixel gray pattern test in which one unit pixel is turned on, and the other unit pixel is turned off, is turned on.

In the driving method of the liquid crystal display according to the first exemplary embodiment of the present invention, as shown in FIG. 6 when the super pixel gray pattern test is performed, the visibility is most excellent (visible to the viewer's eyes). ) The precharge conditions of all the green pixel cells are the same, such as the green pixel cells are precharged by the black image data voltage, thereby preventing image quality defects due to the charging variation of the image data signals. Can be. Through this, the display quality of the liquid crystal display device can be improved.

7 is a diagram illustrating a liquid crystal display according to a second exemplary embodiment of the present invention.

The liquid crystal display 200 according to the second exemplary embodiment of the present invention is a liquid crystal panel 210 except for the arrangement of TFTs connected to the plurality of gate lines GL1 to GLm and the data lines DL1 to DLn in the liquid crystal panel 210. Since it has the same components as the liquid crystal display device 100 according to the first embodiment of the present invention shown in 2, a detailed description thereof will be omitted.

Referring to FIG. 7, the liquid crystal panel 210 of the liquid crystal display 200 according to the second exemplary embodiment of the present invention has a cell gap between the transistor array substrate and the color filter array substrate bonded to each other and the two array substrates. And a liquid crystal filled in the space provided by the spacer.

The liquid crystal panel 110 includes a TFT formed in a pixel region defined by m gate lines GL1 to GLm and n data lines DL1 to DLn, and a liquid crystal cell connected to the TFT.

The TFT supplies an analog video signal from the data lines DL1 to DLn to the liquid crystal cell in response to the gate driving signal from the gate lines GL1 to GLm.

Since the liquid crystal cell includes the common electrode facing the liquid crystal and the pixel electrode connected to the TFT, the liquid crystal cell can be equivalently expressed by the liquid crystal capacitor Clc. The liquid crystal cell includes a storage capacity Cst for maintaining the analog video signal charged in the liquid crystal capacitor Clc until the next analog video signal is charged. The common voltage Vcom is supplied to the common electrode of the liquid crystal cell.

The TFT includes a gate electrode connected to the gate lines GL1 to GLm, a source electrode connected to the data lines DL1 to DLn, and a drain electrode connected to the pixel electrode.

Red (R), green (G), and blue (B) color filters are horizontally arranged on the color filter array substrate of the liquid crystal panel 210.

Pixel cells of the same color are arranged in the horizontal direction through the arrangement of the color filters, and pixel cells of different colors are arranged in the vertical direction so that the pixel cells of red (R), green (G), and blue (B) are matrixed. Arranged in the form.

The liquid crystal display 200 according to the second exemplary embodiment of the present invention uses a two-dot inversion driving method in which two adjacent pixel regions in the vertical direction have inverted polarities in order to prevent cross talk, flicker, and low power consumption. Apply.

8 is a diagram illustrating a gate driving signal applied to a liquid crystal display according to a second exemplary embodiment of the present invention, and FIG. 9 illustrates an input sequence of image data applied to the liquid crystal display according to the second exemplary embodiment of the present invention. It is a figure which shows.

A driving method of the liquid crystal display according to the second exemplary embodiment of the present invention will be described with reference to FIGS. 7 to 9.

The liquid crystal display 200 according to the second exemplary embodiment of the present invention is a TFT turn connected to pixel cells of red (R), green (G), and blue (B) arranged horizontally in one frame period. To turn on, a gate driving signal is applied to each of the plurality of gate lines GL1 to GLm as shown in FIG. 8. 8 illustrates a gate driving signal applied to the first to eighth gate lines GL1 to GL8 among the m gate lines GL1 to GLm.

When the first gate driving signal ① is applied to the first gate line GL1 during one frame period, the TFTs connected to the pixel cells of R11 to Rn1 and G11 to Gn1 are turned on.

Subsequently, when the second gate driving signal ② is applied to the third gate line GL2, the TFT connected to each of the pixel cells of G12 to Gn2 and B12 to Bn2 is turned on.

Subsequently, when the third gate driving signal ③ is applied to the second gate line GL3, the TFTs connected to the pixel cells of B11 to Bn1 and R12 to Rn2 are turned on.

Subsequently, when the fourth gate driving signal ④ is applied to the fourth gate line GL4, the TFT connected to each of the pixel cells of R13 to Rn3 and G13 to Gn3 is turned on.

Thereafter, the gate driving signal is applied to the gate line in the same order as described above in units of four gate lines, and each TFT connected to the gate line is turned on to drive each pixel cell. That is, the time corresponding to the 1H period in the 4K + 3rd gate ("K" is a natural number of 0 or more) than the 4K + 2nd gate line GL2, GL6, ... in the gate lines GL3, GL7, ... First, the gate driving signal is applied.

The pixel cells R11 to Rn1 and G11 to Gn1 driven by the first gate driving signal ① applied to the first gate line GL1 are respectively image data from the data lines DL1 to DLn connected thereto. Receive a signal.

In more detail, the R11 pixel cell is from the first data line DL1, the G11 pixel cell is from the second data line DL2, the R21 pixel cell is from the third data line DL3, and the G21 pixel cell is made from the first data line DL1. From the fourth data line DL4, the R31 pixel cell is from the fifth data line GL5, the G31 pixel cell is from the sixth data line GL6, and the Rn1 pixel cell is from the n-1 th data line DLn-1. The image is displayed by receiving the image data signal. That is, the plurality of pixel cells connected to the same gate line GL on the horizontal line receives an image data signal from different data lines.

The pixel cells driven by the respective gate driving signals applied to the second to mth gate lines GL2 to GLm are driven by the first gate driving signal ① applied to the first gate line GL1 described above. Like the pixel cells R11 to Rn1 and G11 to Gn1, the plurality of pixel cells connected to the same gate line GL on the horizontal line receive an image data signal from different data lines.

Each pixel cell that receives an image data signal from a data line connected to itself has three units of red (R), green (G), and blue (B) formed between two data lines facing each other. The input video signal is displayed.

The liquid crystal display according to the second exemplary embodiment of the present invention can reduce the number of expensive data drive ICs compared to the general liquid crystal display shown in FIG. 1 through the above-described configuration. This can reduce the manufacturing cost of the liquid crystal display device.

In the driving method of the liquid crystal display according to the second exemplary embodiment of the present invention, image data is applied to each of the data lines DL1 to DLn in the order shown in FIG. 9. At this time, the image data having the polarity as shown in FIG. 10 is input to each of the data lines DL1 to DLn so that the polarity is inverted by 2 dots in the vertical direction and 1 dots in the horizontal direction on the liquid crystal panel. do.

In the method of driving the liquid crystal display according to the second exemplary embodiment of the present invention, when the super pixel gray pattern test is performed, as shown in FIG. 6, the visibility is most excellent (visible to the viewer's eyes). ) The precharge conditions of all the green pixel cells are the same, such as the green pixel cells are precharged by the black image data voltage, thereby preventing image quality defects due to the charging variation of the image data signals. Can be. Through this, the display quality of the liquid crystal display device can be improved.

FIG. 11 is a diagram illustrating a gate driving signal applied to a liquid crystal display according to a second exemplary embodiment of the present invention, and FIG. 12 illustrates an input sequence of image data applied to the liquid crystal display according to the second exemplary embodiment of the present invention. It is a figure which shows.

7, 11 and 12, another driving method of the liquid crystal display according to the second exemplary embodiment of the present invention will be described.

The liquid crystal display 200 according to the second exemplary embodiment of the present invention uses a TFT connected to pixel cells of red (R), green (G), and blue (B) arranged horizontally in one frame period. In order to turn on in the vertical direction sequentially, the gate driving signals are sequentially applied to the m gate lines GL1 to GLm from the first gate line GL1 to the mth gate line GLm. FIG. 11 illustrates a gate driving signal applied to the first to sixth gate lines GL1 to GL6 among the m gate lines GL1 to GLm.

When the first gate driving signal ① is applied to the first gate line GL1 during one frame period, the TFTs connected to the pixel cells of R11 to Rn1 and G11 to Gn1 are turned on.

Subsequently, when the second gate driving signal ② is applied to the second gate line GL2, the TFTs connected to the pixel cells of B11 to Bn1 and R12 to Rn2 are turned on.

Subsequently, when the third gate driving signal ③ is applied to the third gate line GL3, the TFTs connected to the pixel cells of G12 to Gn2 and B12 to Bn2 are turned on.

Thereafter, when the fourth to mth gate driving signals are applied to the fourth to nth gate lines GL4 to GLn, the TFTs connected to the respective gate lines are turned on to drive the respective pixel cells.

The pixel cells R11 to Rn1 and G11 to Gn1 driven by the first gate driving signal ① applied to the first gate line GL1 are respectively image data from the data lines DL1 to DLn connected thereto. Receive a signal.

In more detail, the R11 pixel cell is from the first data line DL1, the G11 pixel cell is from the second data line DL2, the R21 pixel cell is from the third data line DL3, and the G21 pixel cell is made from the first data line DL1. From the fourth data line DL4, the R31 pixel cell is from the fifth data line GL5, the G31 pixel cell is from the sixth data line GL6, and the Rn1 pixel cell is from the n-1 th data line DLn-1. The image is displayed by receiving the image data signal. That is, the plurality of pixel cells connected to the same gate line GL on the horizontal line receives an image data signal from different data lines.

The pixel cells driven by the respective gate driving signals applied to the second to mth gate lines GL2 to GLm are driven by the first gate driving signal ① applied to the first gate line GL1 described above. Like the pixel cells R11 to Rn1 and G11 to Gn1, the plurality of pixel cells connected to the same gate line GL on the horizontal line receive an image data signal from different data lines.

Each pixel cell that receives an image data signal from a data line connected to itself has three units of red (R), green (G), and blue (B) formed between two data lines facing each other. The input video signal is displayed.

Another driving method of the liquid crystal display according to the second exemplary embodiment of the present invention applies image data to the data lines DL1 to DLn in the order shown in FIG. 12. In this case, image data having a polarity as shown in FIG. 13 is input to each of the data lines DL1 to DLn so that the polarity is inverted by 2 dots in the vertical direction and 1 dots in the horizontal direction on the liquid crystal panel. do.

Another driving method of the liquid crystal display according to the second exemplary embodiment of the present invention is performed by the super pixel gray pattern test, as shown in FIG. The green pixel cells, which are visible, are precharged by the black image data voltage, thereby preventing image quality defects due to charging variations of the image data signals. Through this, the display quality of the liquid crystal display device can be improved.

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.

As described above, the liquid crystal display according to the exemplary embodiment of the present invention has an expensive data drive by horizontally arranging pixel cells of red (R), green (G), and blue (B) on the liquid crystal panel. The number of ICs can be reduced compared to the case. This can reduce the manufacturing cost of the liquid crystal display device.

According to an exemplary embodiment of the present invention, a method of driving a liquid crystal display device includes a green pixel cell having the highest visibility (which is best seen by the viewer's eye) by being precharged by a black image data voltage. Since the precharge conditions of all the green pixel cells are the same, it is possible to prevent poor image quality due to the charging variation of the image data signal. Through this, the display quality of the liquid crystal display device can be improved.

Claims (17)

A liquid crystal panel comprising pixel cells formed for each region defined by a plurality of gate lines and a plurality of data lines; A gate driver for applying a driving signal to the gate line; And a data driver for applying image data to the data line so that the polarity of the image data charged in the pixel cells of the liquid crystal panel is inverted by 2 dots in the vertical direction and 1 dot in the horizontal direction. Up and down adjacent pixel cells are connected by sharing one gate line, and the up and down adjacent pixel cells are connected to different data lines on a horizontal line, The red display cell, the green pixel cells, and the blue pixel cells are sequentially arranged in the horizontal line unit. delete The method of claim 1, And the gate driver sequentially applies a gate driving signal to the gate line. The method of claim 3, wherein And the data driver inverts the polarity of the image data applied to each of the data lines in units of 2 dots in synchronization with the gate driving signal. delete The method of claim 1, And the gate driver applies a gate driving signal out of order to the gate line. The method of claim 6, And the gate driver applies a gate driving signal to a 4K + 3 th gate line of the plurality of gate lines before the 4K + 2 th gate line. The method of claim 7, wherein And the data driver inverts the polarity of the image data applied to each of the data lines in units of 2 dots in synchronization with the gate driving signal. The method of claim 3, wherein And the data driver inverts the polarity of the image data applied to each of the data lines in units of one dot in synchronization with the gate driving signal. A driving method of a liquid crystal display device comprising a liquid crystal panel including a pixel cell formed for each region defined by a plurality of gate lines and a plurality of data lines, Supplying a driving signal to the gate line by a gate driver; Supplying image data to the data line in synchronization with the driving signal so that the polarity of the image data charged in the pixel cells of the liquid crystal panel is inverted by 2 dots in the vertical direction and 1 dot in the horizontal direction. Including; The pixel cells are connected by vertically adjacent pixel cells sharing one gate line, and the vertically adjacent pixel cells are connected to different data lines on a horizontal line, and the red and white pixel cells are formed in units of the horizontal line. And a plurality of pixel cells and blue pixel cells sequentially arranged in sequence. 11. The method of claim 10, And the driving signal is sequentially applied to the plurality of gate lines. The method of claim 11, The polarity of the image data is inputted inverted in units of 2 dots. delete 11. The method of claim 10, And the driving signal is applied in a non-sequential manner to the plurality of gate lines. 15. The method of claim 14, And applying a gate driving signal to a 4K + 3 th gate line among the plurality of gate lines before the 4K + 2 th gate line. 16. The method of claim 15, The polarity of the image data is inputted inverted in units of 2 dots. The method of claim 11, And the polarity of the image data is inverted in units of 1 dot.

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