TWI469117B - A driving method of a double-gate type liquid crystal display panel - Google Patents

Description

Double gate liquid crystal display panel driving method

The invention relates to a liquid crystal display technology, in particular to a liquid crystal display panel driving method, which can drive a liquid crystal display (LCD) by a pre-charge method.

Liquid crystal display (LCD) has the advantages of low radiation, small size and low energy consumption. It has gradually replaced the traditional cathode ray tube (CRT) display, and is widely used in notebook computers. Personal digital assistant (PDA), flat-screen TV, or mobile phone and other information products. The driving method of the liquid crystal display device generally uses a timing controller to generate various control signals, so that the source driver and the gate driver can drive the pixel unit on the panel accordingly. To display an image. Depending on the driving mode, the pixel structure of the liquid crystal display panel can be mainly divided into a single-gate pixel structure and a double-gate pixel structure. At the same resolution, compared to a liquid crystal display panel using a single gate type pixel structure, the number of scanning lines of the liquid crystal display panel using the double gate type pixel structure is doubled, and the number of data lines is reduced to One-half, therefore, a liquid crystal display panel employing a dual gate type pixel structure uses more gate drive wafers and fewer source drive wafers. Due to the brake The cost and power consumption of the pole drive chip are lower than that of the source driver chip, so the dual gate type pixel structure design can reduce the production cost and power consumption.

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a conventional dual gate liquid crystal display device 100 . The dual gate liquid crystal display device 100 includes a dual gate liquid crystal display panel 110, a source driving circuit 120, a gate driving circuit 130, and a timing controller 140. The liquid crystal display panel 110 is provided with a plurality of data lines DL1 DL DLm, a plurality of scanning lines GL1 GL GLn, and a pixel matrix. The pixel matrix includes a plurality of pixel units PX, each pixel unit PX includes a thin film transistor switching TFT, a liquid crystal capacitor CLC, and a storage capacitor CST, respectively coupled to corresponding data lines, corresponding scan lines, and a Common electrode voltage VCOM. In the liquid crystal display device 100, two adjacent row pixel units PX are coupled to the same corresponding data line, wherein the odd-numbered column pixel units PX are coupled to the corresponding odd-numbered scan lines GL1, GL3, . . . , GLn- 1, the even-numbered column pixel unit PX is coupled to the corresponding even-numbered scan lines GL2, GL4, . . . , GLn.

The timing controller 140 can generate control signals required for the operation of the source driving circuit 120 and the gate driving circuit 130, such as the latch pulse signal TP and the image data DATA. The gate driving circuit 130 can sequentially output the gate driving signals SGL1 S SGLn to the scanning lines GL1 GL GLn according to the latching pulse signal TP, and the source driving circuit 120 can respectively output the data corresponding to the gray scale value of the image according to the image data DATA. The signals SD1~SDm are connected to the data lines DL1~DLm, and then charged to the corresponding pixel units.

Generally, the data signal of the pixel unit can be classified into a positive video signal and a negative video signal according to the relationship between the data signal and the common electrode voltage VCOM. The positive polarity data signal means that the potential is higher than the common electrode voltage VCOM, and the negative polarity data signal is relatively Its potential is lower than the common electrode voltage VCOM. In addition, in order to prevent the liquid crystal molecules from being constantly biased by a single polarity electric field, the lifetime of the liquid crystal molecules is shortened, and each pixel unit must be driven in a polarity inversion manner. The common pixel array polarity inversion method has a frame inversion. (frame inversion), column inversion, column inversion, and dot inversion.

In order to speed up the pixel voltage to reach the speed of the video bit, the bit level of the data line can be increased in advance by pre-charging the bit element of the pixel unit to the positive/negative polarity to maximize the gray scale change of the liquid crystal molecule. Voltage value. Through the above pre-charging technology, the voltage can be changed first to reach the target pixel voltage early, so that the LCD can more accurately represent the gray scale it should have.

At present, the precharge technology is applied to a liquid crystal display device having a double gate pixel structure, which is generally suitable for the case of column inversion.

Please refer to FIG. 2A and FIG. 2B. FIG. 2A and FIG. 2B are schematic diagrams of a conventional double-gate liquid crystal display panel 210 driven by column inversion. As shown in FIG. 2A, in the Xth frame, the odd-numbered column pixel units PX input positive polarity data signals, and the even-numbered column pixel units PX input negative polarity data signals. As shown in FIG. 2B, in the next frame X+1, the odd-numbered pixel units PX are all input with a negative polarity data signal, and the even-numbered column pixel units PX are all input with a positive polarity data signal.

Please refer to FIG. 3. FIG. 3 shows a conventional driving method of the dual-gate liquid crystal display panel 210. Each scanning line is sequentially turned on according to the arrangement order of the scanning lines, that is, the driving timing is GL1, GL2, GL3, . .., GLn.

To apply the precharge technology to the dual gate liquid crystal display panel 210, the driving timing is: first turn on the first scan line, and connect the pixel list connecting the first scan line GL1. Inputting the first pre-charge signal, turning on the second scan line GL2, inputting the first data signal to the pixel unit connected to the first scan line GL1, and inputting the pixel unit connected to the second scan line GL2 Second pre-charge signal. However, since the pixel unit connected to the first scanning line GL1 is an odd-numbered column pixel, both of which are positive polarity, and the pixel unit connected to the second scanning line GL2 is an even-numbered column of pixel units, both of which are negative polarity, and therefore cannot be in the first strip. The pixel unit corresponding to the scanning line GL1 is charged with the positive polarity data signal, and the pixel unit corresponding to the second scanning line GL2 is charged with the negative polarity pre-charging signal. If the pixel unit corresponding to the second scanning line GL2 is charged with a positive pre-charge signal, the corresponding pixel unit needs more charging time to charge the required negative gray scale, which will cause the pixel unit to be charged. insufficient. Therefore, the conventional driving method is not suitable for the technique of performing precharging of the column-reverse driving double gate liquid crystal display device.

In addition, the double-gate liquid crystal display panel adopts a single-point plus double-dot inversion (1+2 dot inversion) polarity inversion method, that is, the pixel unit of the first column pixel and the last column is dot inversion, and the rest The pixel unit of the column is a two-point inversion.

Please refer to FIG. 4A and FIG. 4B. FIG. 4A and FIG. 4B show a conventional single-point plus two-dot inversion driven dual-gate liquid crystal display panel 310. In the Xth frame shown in FIG. 4A, the first column pixel unit PX and the second m column pixel unit PX of the odd row need to be charged with the positive polarity data signal, the even row of the first column pixel unit PX and the 2m The column pixel unit PX needs to be charged with a negative polarity data signal. From the second column to the 2m-1th column, the polarity of the pixel unit is reversed in a single unit in the longitudinal direction, and the pixel is inverted in the horizontal direction. . In the X+1th frame shown in FIG. 4B, the first column pixel unit PX and the second m column pixel unit PX of the odd row need to be charged with the negative polarity data signal, the even row of the first column pixel unit PX and The 2m column pixel unit PX needs to be charged with a positive polarity data signal, from the second column to the first The pixels of 2m-1 columns reverse the polarity of the pixel unit in a single unit in the longitudinal direction, and are inverted in the horizontal direction in units of two points.

This method of polarity reversal of single point plus double point inversion cannot implement the precharge technique if a conventional driving method is used. Please refer to FIG. 5. FIG. 5 shows a conventional driving method of a single-point plus double-dot reverse double-gate liquid crystal display panel 310. Each scanning line GL is sequentially turned on according to the arrangement order of the scanning lines GL, that is, scanning. The driving timing of the line GL is: GL1, GL2, GL3, ..., GLn.

To apply the pre-charging technology to the dual-gate liquid crystal display panel 310, the driving timing is: first turning on the first scanning line GL1, inputting the first pre-charging signal to the pixel unit connected to the first scanning line GL1, and then The second scanning line GL2 is turned on, and the first data signal is input to the pixel unit connected to the first scanning line GL1, and the second pre-charging signal is input to the pixel unit connected to the second scanning line GL2. However, since the polarity of the pixel unit PX connected to the first scanning line GL1 is [+-+-+-...], the polarity of the pixel unit PX connected to the second scanning line GL2 is [-+-+-+...], The polarity of the pixel unit PX connected to the third scanning line GL3 is [+-+-+-...], so the pixel unit PX connected to the first scanning line GL1 cannot be charged with the data signal while being coupled to the same column. The pixel unit PX connected to the second scanning line GL2 is charged with a pre-charge signal of opposite polarity; similarly, the pixel unit PX connected to the second scanning line GL2 cannot be charged with the data signal, and is coupled to the same column and coupled to The pixel unit PX of the second scanning line GL2 is charged with a precharge signal of opposite polarity.

Therefore, the conventional driving method is also not suitable for the pre-charging technique of the single-point plus double-dip dual-gate liquid crystal display device.

In order to solve the above problems, the present invention provides a double gate liquid crystal display panel. The driving method is applicable to the polarity inversion type of column inversion and single point plus double point inversion.

The invention provides a driving method suitable for a double-gate liquid crystal display panel, which can implement a pre-charging technology and can avoid the problem of insufficient charging of the pixel unit.

The invention provides a driving method suitable for a double-gate liquid crystal display panel, which can avoid lateral crosstalk and reduce power consumption, so that the quality of the double-gate liquid crystal display device can be greatly improved.

In order to achieve these and other advantages and in accordance with the purpose of the present invention, the present invention provides a driving method suitable for a dual-gate liquid crystal display panel, which in the order of four scan lines in sequence, first opens in the first time period. a scan line, inputting a first pre-charge signal to a pixel unit connected to the first scan line, and then turning on a second scan line, inputting a first data signal to a pixel unit connected to the first scan line, and simultaneously connecting the second data line The pixel unit of the scan line inputs a second pre-charge signal, turns off the first scan line and maintains the second scan line, inputs a second data signal to the pixel unit connected to the second scan line, and then turns off the second scan line. Opening a third scan line in the second time period, inputting a third pre-charge signal to the pixel unit connected to the third scan line, and then turning on the fourth scan line to input the pixel unit connected to the third scan line a third data signal, at the same time, inputting a fourth pre-charge signal to the pixel unit connected to the fourth scan line, turning off the third scan line and maintaining the fourth scan line on, and connecting the first Cell input pixel data signals to the fourth scanning line, and then close the fourth scanning line, wherein the same pre-charge signal and the polarity of data signals for each pixel unit.

The present invention further provides a driving method suitable for a dual gate liquid crystal display panel. The double gate liquid crystal display panel includes n scan lines, m data lines, and a plurality of pixel units, and two adjacent rows of pixel units are coupled. Corresponding to the same data line, wherein the odd-numbered column pixel unit is coupled to the corresponding odd-numbered scan line, and the even-numbered column of pixel units Coupling to a corresponding even number of scan lines, where m and n are both positive integers.

The present invention further provides a driving method suitable for a dual gate liquid crystal display panel. The double gate liquid crystal display panel adopts a column inversion manner, and the first scan line is a 4k+1th scan line, and the second scan The line is the 4k+3th scan line, the third scan line is the 4k+2th scan line, and the fourth scan line is the 4k+4th scan line, where k≧0 is an integer; in the first During the time period, each data line outputs a signal of a first polarity, and in the second time period, each data line outputs a signal of a second polarity, and the first polarity is opposite to the second polarity; The first polarity signal includes the first pre-charge signal and the first data signal, the second pre-charge signal and the second data signal, and the second polarity signal includes a third pre-charge signal and a third data signal, Four pre-charge signals and fourth data signals.

The invention further provides a driving method suitable for a double gate liquid crystal display panel, wherein the double gate liquid crystal display panel adopts a single point plus double dot inversion manner, wherein the first column pixel unit and the 2m column pixel unit are point inverse Turning, the remaining column pixel units are two-point inversion; the first scan line is the 4k+1th scan line, the second scan line is the 4k+4th scan line, and the third scan line is the 4k+2 a scan line, the fourth scan line is a 4k+3 scan line, where k ≧ 0 is an integer; in the first time period, the odd data lines output the first polarity signal, and the even data line output a second polarity signal; in the second time period, the odd data lines output the second polarity signal, the even data lines output the first polarity signal, and the first polarity is opposite to the second polarity; The first polarity signal includes a first pre-charge signal, a first data signal, a second pre-charge signal, and a second data signal, and the second polarity signal includes a third pre-charge signal, a third data signal, and a fourth pre-charge signal. And the fourth information signal.

To make the above features and advantages of the present invention more apparent, the following specific embodiments are provided. The details are as follows with the accompanying drawings.

100‧‧‧Double gate liquid crystal display device

110, 210, 310‧‧‧Double gate liquid crystal display panel

120‧‧‧Source drive circuit

130‧‧ ‧ gate drive circuit

140‧‧‧Sequence Controller

DL1~DLm‧‧‧ data line

GL1~GLn‧‧‧ scan line

PX‧‧ ‧ pixel unit

T1‧‧‧ first time period

t2‧‧‧Second time period

1 is a schematic structural view of a conventional double gate liquid crystal display device

2A and 2B are schematic views of a conventional double-gate liquid crystal display panel employing column inversion driving.

FIG. 3 is a schematic diagram of a conventional column inversion driving double gate liquid crystal display panel driving method.

4A and 4B are schematic views of a conventional single-point plus two-dot inversion driven double-gate liquid crystal display panel.

FIG. 5 is a conventional driving method of a single-point plus two-dot inversion driven double-gate liquid crystal display panel.

FIG. 6 is a driving method of a double gate liquid crystal display panel capable of realizing pre-charge column inversion driving.

FIG. 7 is a diagram showing a driving method of a column inversion driving double gate liquid crystal display panel according to the present invention.

FIG. 8 is a diagram showing a driving method of a single-point plus two-dot inversion driven double-gate liquid crystal display panel according to the present invention.

The driving method of the double-gate liquid crystal display panel of the present invention is based on the structure of a conventional double-gate liquid crystal display device, and a conventional column inversion polarity inversion type is applied. Please refer to FIG. 1. FIG. 1 is a conventional liquid crystal display device 100 with a double gate structure. The dual gate liquid crystal display device 100 includes a dual gate liquid crystal display panel 110, a source driving circuit 120, and a gate driving circuit 130. And a timing controller 140. The dual gate liquid crystal display panel 110 includes a plurality of scan lines GL arranged in parallel, a plurality of data lines DL orthogonal to the plurality of scan lines GL, and a plurality of pixel units PX; wherein the plurality of scan lines GL include the first strip The scan line GL1, the second scan line GL2, ..., the nth scan line GLn; the plurality of data lines DL include a first data line DL1, a second data line DL2, ..., and an mth data line DLm.

Each of the pixel units PX includes a thin film transistor switching TFT, a liquid crystal capacitor CLC, and a storage capacitor CST. The thin film transistor TFT includes a control end coupled to a corresponding scan line GL; , coupled to a corresponding data line DL, and a second end. The liquid crystal capacitor CLC is coupled between the second end of the thin film transistor and a common electrode voltage VCOM; the storage capacitor CST is coupled between the second end of the thin film transistor and the common electrode voltage VCOM. In the liquid crystal display device, two adjacent row pixel units PX are coupled to the same corresponding data line DL, wherein the odd-numbered column pixel unit PX disposed on the left side of the data line DL, and the odd-numbered column pixel unit PX The pixel unit PX is coupled to the corresponding odd-numbered scan lines GL1, GL3, . . . GLn-1, and is disposed on the right side of the data line DL, and the pixel unit PX of the even-numbered column is coupled to the corresponding even number Scan lines GL2, GL4, ..., GLn.

The pixel unit PX of the 3k+1th column may correspond to the pixel unit (R) displaying the red image; the pixel unit PX of the 3k+2th column may correspond to the pixel unit (G) displaying the green image; 3k+3 The pixel unit PX of the column may correspond to the pixel unit (B) that displays the blue image, but is not limited thereto.

According to the above description, the polarity inversion pattern of the conventional column inversion is described. The double gate liquid crystal display device 100 is a column inversion for the application, so please refer to FIG. 2A and FIG. 2B, FIG. 2A and FIG. 2B. A schematic diagram of a dual gate liquid crystal display panel 210 shown as a column inversion drive. As shown in FIG. 2A, the double gate liquid crystal display panel 210 is in the Xth frame. The pixel unit PX in the odd-numbered column inputs the positive polarity data signal VC (not shown), and the pixel unit PX in the even-numbered column inputs the negative polarity data signal VC, wherein the polarity of each row of pixel units PX is [+ -+-+-...+-]. Following the Xth frame of FIG. 2A, the next frame shown in FIG. 2B is displayed, that is, the X+1th frame. In the X+1th frame, the odd-numbered column pixel units PX are input with negative polarity. The data signal VC and the even-numbered column pixel unit PX each input a positive polarity data signal VC, wherein the polarity of each row of pixel units PX is [-+-+-+...-+].

FIG. 6 shows a driving method applicable to the dual gate liquid crystal display panel 210. The double gate liquid crystal display panel 210 first opens the first scanning line GL1 in the Xth frame. The line DL respectively charges a plurality of pixel units PX connected to the first scanning line GL1 with a positive pre-charge signal (not shown), and after completing the charging of the positive polarity pre-charging signal (not shown) And continuing to turn on the first scanning line GL1 and simultaneously turning on the third scanning line GL3. At this time, each data line DL inputs a positive polarity data signal to the pixel unit PX connected to the first scanning line GL1. The first pre-charging signal (not shown) is input to the pixel unit PX connected to the third scanning line GL3, and the first scanning line GL1 is turned off and maintained after the data line DL input signal is completed. The third scanning line GL3 is turned on, and the fifth scanning line GL5 is turned on while the third scanning line GL3 is turned on. At this time, each data line DL is charged to the pixel unit PX connected to the third scanning line GL3. Positive data signal (not shown), and connection The pixel unit PX of the fifth scanning line GL5 inputs a positive pre-charge signal (not shown), as shown in FIG. 6, and similarly, the seventh scanning line GL7 and the ninth strip are sequentially driven according to the driving method. The scanning line GL9, the eleventh scanning line GL11, ..., the n-1th scanning line GLn-1. Since the pixel unit PX connecting the first scanning line GL1 and the third scanning line GL3 is required to be charged with a positive polarity data signal, the driving method can achieve the function of pre-charging. In this In the manual, the data signal of the pixel unit is indicated by VC, and the pre-charge signal is indicated by Vp, which are not indicated in the figure.

After all the odd-numbered scanning lines GL are driven, the even-numbered scanning lines GL are sequentially driven. Similarly, the second scanning lines GL2 are first turned on, and the data lines DL are respectively connected to the pixel units PX connected to the second scanning lines GL2. Filling in the negative precharge signal, after completing the charging of the negative polarity precharge signal, maintaining the second scanning line GL2 and simultaneously turning on the fourth scanning line GL4, at which time each data line DL is connected to the The pixel unit PX of the second scanning line GL2 inputs a negative polarity data signal, and inputs a negative pre-charge signal to the pixel unit PX connected to the fourth scanning line GL4 to complete the data line DL input signal, and then turns off the first The two scanning lines GL2 maintain the opening of the fourth scanning line GL4, and the sixth scanning line GL6 is turned on while the fourth scanning line GL4 is turned on, and the data lines DL are connected to the fourth scanning. The pixel unit PX of the line GL4 is charged with a negative polarity data signal, and the pixel unit PX connected to the sixth scanning line GL6 is charged with a negative polarity precharge signal. Similarly, the driving method sequentially drives the eighth scanning line GL8, the tenth scanning line GL10, the twelfth scanning line GL12, ..., the nth scanning line GLn, and sequentially connects the even scanning lines GL. The pixel unit PX inputs a negative precharge signal Vp and a data signal VC, respectively.

As described above, this driving method can be applied to a double gate liquid crystal display device using column inversion, but this method is liable to cause a lateral crosstalk phenomenon.

Based on the conventional double gate liquid crystal display panel structure and the conventional column inversion polarity inversion mode, the driving method of the present invention is added, and the driving method thereof is as shown in FIG. Fig. 7 is a view showing a driving method of the first embodiment of the present invention, which is applicable to a column-inverted double-gate liquid crystal display panel, and which eliminates lateral crosstalk. Please refer to FIG. 7 , which is a scanning screen of the double gate liquid crystal display panel 210 in the Xth frame. The line GL is driven for one group, and the driving time of each group of scanning lines is divided into a first time period t1 and a second time period t2.

Taking the first group of scan lines as an example, the driving method is as follows: in the first time period t1, the first scan line GL1 is first turned on, and each data line DL is respectively connected to the pixel unit PX connected to the first scan line GL1. The first pre-charge signal VP1 of the positive polarity is input, and after the first pre-charge signal VP1 is completed, the first scan line GL1 is turned on and the third scan line GL3 is turned on at the same time, so that the data lines DL are respectively separated. The first data signal VC1 of the positive polarity is input to the pixel unit PX connected to the first scanning line GL1, and the second pre-charge signal VP2 of the positive polarity is input to the pixel unit PX connected to the third scanning line GL3. After the data line DL is input to the signal, the first scan line GL1 is turned off and the third scan line GL3 is turned on. At this time, each data line DL inputs a positive polarity to the pixel unit PX connected to the third scan line GL3. The second data signal VC2, after completing the charging of the second data signal VC2, turns off the third scanning line GL3, wherein each of the data lines DL outputs a positive polarity signal during the first time period t1.

In the second time period t2, the second scanning line GL2 is first turned on, so that each data line DL inputs a negative third pre-charging signal VP3 to the pixel unit PX connected to the second scanning line GL2, respectively. After charging the third pre-charge signal VP3, the second scan line GL2 is turned on and the fourth scan line GL4 is turned on. At this time, each data line DL is respectively input to the pixel unit PX connected to the second scan line GL2. The third data signal VC3 of the negative polarity is simultaneously input to the fourth pre-charge signal VP4 of the negative polarity to the pixel unit PX connected to the fourth scanning line GL4, and the second scanning line is turned off after the data line DL input signal is completed. GL2 maintains the fourth scan line GL4, and each data line DL inputs a fourth negative polarity to the pixel unit PX connected to the fourth scan line GL4. The data signal VC4, after completing the charging of the fourth data signal VC4, turns off the fourth scanning line GL4, wherein in the second time period t2, each data line DL outputs a negative polarity signal.

As can be seen from FIG. 7, the pre-charge signal VP of each pixel unit PX and the data signal VC are of the same polarity, and the pre-charge signal VP1 of the pixel unit PX connected to the GL1 and the data signal VC1 and the pixel connected to the GL3 are connected. The pre-charge signal VP2 of the unit PX and the data signal VC2 are both positive, so that the pixel unit PX connected to the GL3 can be precharged while charging the pixel unit PX connected to GL1. Similarly, since the pre-charge signal VP3 of the pixel unit PX connected to the GL2 and the data signal VC3 and the pre-charge signal VP4 and the data signal VC4 of the pixel unit PX connected to the GL4 are both negative, the pixel unit connected to the GL2 can be connected. While the PX is charging, the pixel unit PX connected to the GL4 is precharged, and the phenomenon of insufficient charging can be avoided.

Each set of scan lines is driven in sequence, and the drive time of each scan line is divided into a first time period t1 and a second time period t2. The driving timing of each group of scanning lines is as follows: first, the first scanning line GL1' is turned on in the first time period t1, and each of the data lines DL inputs the first pre-input to the pixel unit PX connected to the first scanning line GL1'. After charging the first pre-charge signal VP1', the charging signal VP1' maintains the first scan line GL1' and turns on the second scan line GL2'. At this time, each data line DL is connected to the first scan. The pixel unit PX of the line GL2' inputs the first data signal VC1', and simultaneously inputs the second pre-charge signal VP2' to the pixel unit PX connected to the second scan line GL2', and then closes the data line DL input signal. a scan line GL1 ′ and maintaining the second scan line GL2 ′. At this time, each data line DL inputs a second data signal VC2 ′ to the pixel unit PX connected to the second scan line GL2 ′, and the charging is completed. After the second data signal VC2', the second scan line GL2' is turned off, wherein In a time period t1, each data line DL outputs a positive polarity signal; in a second time period t2, the third scan line GL3' is first turned on, and at this time, each data line DL is respectively connected to the third scan line GL3. The pixel unit PX inputs the third pre-charge signal VP3', and after the charging of the third pre-charge signal VP3' is completed, the third scan line GL3' is turned on and the fourth scan line GL4' is turned on. The DL inputs the third data signal VC3' to the pixel unit PX connected to the third scan line GL3', and simultaneously inputs the fourth pre-charge signal VP4' to the pixel unit PX connected to the fourth scan line GL4' to complete the data line. After the DL input signal, the third scan line GL3' is turned off and the fourth scan line GL4' is turned on. At this time, each data line DL inputs the fourth data signal VC4 to the pixel unit PX connected to the fourth scan line GL4'. After the fourth data signal VC4' is completed, the fourth scan line GL4' is turned off. In the second time period t2, each data line DL outputs a negative polarity signal, wherein each pixel unit PX Pre-charge signal Vp and data signal VC Of the same.

Wherein, in the driving of the (k+1)th scan line, the first scan line GL1' is the 4k+1th scan line GL4k+1, and the second scan line GL2' is the 4k+3th scan line GL4k+3, The third scan line GL3' is the 4k+2th scan line GL4k+3, and the fourth scan line GL4' is the 4k+4th scan line GL4k+4, where k ≧ 0 and is an integer.

The dual gate liquid crystal display panel may further include a last set of scan lines, including only two scan lines GL, and still drive with the drive timing in each set of scan lines.

By means of the pre-charging driving method, the bit element of the pixel unit PX can be preliminarily increased, so that the pixel voltage can reach the target bit level earlier, and the pixel unit PX is prevented from being insufficiently charged and the lateral crosstalk phenomenon is not easily generated.

According to the above-mentioned continuation description, the polarity inversion pattern of the single point plus double point inversion is known, FIG. 4A and FIG. 4B shows a conventional double-gate liquid crystal display panel 310 that performs single-point plus double-dot inversion. In the Xth frame shown in FIG. 4A, the first column of pixel units PX and the 2mth column of pixel units PX of the odd rows need to be charged with a positive polarity data signal, and the even columns of the first column of pixel units PX and 2m The column pixel unit PX needs to be charged with a negative polarity data signal. From the pixel unit PX of the second column to the second m-1 column, the polarity of the pixel unit PX is reversed in a single unit in the longitudinal direction, and the two points in the lateral direction are The units invert them, wherein the polarity of the pixel unit PX located in the odd line is [+--++--...-], and the polarity of the pixel unit PX located in the even line is [-++--++...+] . In the X+1th frame shown in FIG. 4B, the first column pixel and the second m column pixel unit of the odd row need to be charged with the negative polarity data signal, the even column first column pixel and the second m column pixel unit The PX needs to be charged with a positive polarity data signal. From the pixel unit PX of the second column to the second m-1 column, the polarity of the pixel unit PX is reversed in a single unit in the longitudinal direction, and the polarity is reversed in the horizontal direction. Among them, the polarity of the pixel unit PX located in the odd row is [-++--++...+], and the polarity of the pixel unit PX located in the even row is [+--++--...-].

Based on the structure of the conventional double-gate liquid crystal display panel and the conventional polarity reversal pattern of single-point plus double-dot inversion, the second driving method of the present invention is added, and the driving method thereof is as shown in FIG. 8. Shown. FIG. 8 is a driving method of a second embodiment of the present invention, which is applicable to a single-point plus double-dot reversed double-gate liquid crystal display panel 310, which is in an X-th frame as shown in FIG. 4A. Referring to FIG. 8, the driving time of each group of scanning lines is divided into a first time period t1 and a second time period t2 by sequentially driving four scanning lines GL.

Taking the first group of scan lines as an example, the driving timing is: first, the first scan line GL1 is turned on in the first time period t1, and each data line DL is respectively connected to the pixel unit connected to the first scan line GL1. PX input first pre-charge After completing the charging of the first pre-charge signal VP1, the number VP1 maintains the first scanning line GL1 and simultaneously turns on the fourth scanning line GL4. At this time, each data line DL is connected to the first scanning line. The pixel unit PX of the GL1 inputs the first data signal Vc1, and simultaneously inputs the second pre-charge signal VP2 to the pixel unit PX connected to the fourth scanning line GL4. After completing the data line DL input signal, the first scan line is turned off and maintained. The fourth scanning line GL4 is turned on. At this time, each data line DL inputs a second data signal Vc2 to the pixel unit PX connected to the fourth scanning line GL4, and then turns off the charging after completing the charging of the second data signal Vc2. The fourth scan line GL4 is first turned on in the second time period t2. At this time, each data line DL inputs a third pre-charge signal VP3 to the pixel unit PX connected to the second scan line GL2. After the charging of the third pre-charge signal VP3 is completed, the second scanning line GL2 is turned on and the third scanning line GL3 is turned on, and each data line DL is respectively input to the pixel unit PX connected to the third scanning line GL3. Three data signals Vc3, simultaneous connection The pixel unit PX of the third scanning line GL3 inputs the fourth pre-charging signal VP4, and after the data line DL input signal is completed, the second scanning line GL2 is turned off and the third scanning line GL3 is turned on. The DL inputs the fourth data signal Vc4 to the pixel unit PX connected to the third scan line GL3, and turns off the third scan line GL3 after completing the charging of the fourth data signal Vc4.

As can be seen from FIG. 8, the pre-charge signal VP of each pixel unit PX and the data signal Vc are both of the same polarity.

Meanwhile, in the first time period t1, the odd-numbered data lines DL all output positive polarity signals, and the even-numbered data lines DL all output negative polarity signals, and in the second time period t2, odd-numbered data The line DL outputs a negative polarity signal, and the even number of data lines DL both output a positive polarity signal.

In the first time period t1, the pixel unit PX coupled to the odd data line DL and the first scan line GL1 and the pixel unit PX coupled to the odd data line DL and the fourth scan line GL4 are pre- The charging signal VP and the data signal Vc are both positive; at the same time, the pixel unit PX coupled to the even data line DL and the first scanning line GL1 is coupled to the even data line DL and the fourth scanning line GL4. The pre-charge signal VP and the data signal Vc of the pixel unit PX are both negative, so that the pixel unit PX connected to the GL4 can be precharged while charging the pixel unit PX connected to GL1.

In the first time period t2, the pixel unit PX coupled to the odd-numbered data lines DL and the second scanning line GL2 and the pixel unit PX coupled to the odd-numbered data lines DL and the third scanning lines GL3 are pre- The charging signal VP and the data signal Vc are both negative. At the same time, the pixel unit PX coupled to the even data line DL and the second scanning line GL2 is coupled to the even data line DL and the third scanning line GL3. The pre-charge signal VP and the data signal Vc of the pixel unit PX are both positive, so that the pixel unit PX connected to the GL3 can be precharged while charging the pixel unit PX connected to GL2.

In short, since the polarity of the pixel unit PX connected to the first scanning line GL1 and the fourth scanning line GL4 is [+-+-+-...], the second scanning line GL2 and the third scanning line GL3 The polarity of the connected pixel unit PX is [-+-+-+...], so that the pixel connecting the fourth scanning line GL4 can be charged while charging the pixel unit PX connected to the first scanning line GL1. The unit PX performs precharging; and the pixel unit PX connected to the third scanning line GL3 may be precharged while charging the pixel unit PX connected to the second scanning line GL2.

Each group of scan lines is driven in sequence, and the driving timing of each group of scan lines is as follows: the first scan line GL1' is first turned on in the first time period t1, and each data line DL is connected to the first scan line GL1' The pixel unit PX inputs the first pre-charge signal VP1', After the charging of the first pre-charge signal VP1' is completed, the first scan line GL1' is turned on and the second scan line GL2' is turned on. At this time, each data line DL is respectively connected to the pixel connected to the first scan line GL1'. The unit PX inputs the first data signal Vc1', and simultaneously inputs the second pre-charge signal VP2' to the pixel unit PX connected to the second scan line GL2', and closes the first scan line GL1' after completing the data line DL input signal. The second scan line GL2 ′ is turned on, and the data lines DL respectively input the second data signal Vc2 ′ to the pixel unit PX connected to the second scan line GL2 ′, after completing the charging of the second data signal Vc 2 ′. The second scan line GL2' is turned off again; in the second time period, the second scan line GL3' is turned on first, and each data line DL inputs a third precharge to the pixel unit PX connected to the third scan line GL3'. After the signal Vp3' is completed, the third scan line GL3' is turned on and the fourth scan line GL4' is turned on, and the data lines DL are respectively connected to the third scan line. GL3' pixel unit PX inputs third data signal Vc3', at the same time, the fourth pre-charge signal Vp4' is input to the pixel unit PX connected to the fourth scan line GL4', after the data line DL input signal is completed, the third scan line GL3' is turned off and the fourth scan line is turned on. GL4', at this time, each data line DL inputs a fourth data signal Vc4' to the pixel unit PX connected to the fourth scan line GL4', and then turns off the fourth scan line after completing the charging of the fourth data signal Vc4'. GL4', wherein the pre-charge signal VP of each pixel unit PX and the polarity of the data signal Vc are the same.

Wherein, in the driving of the (k+1)th scan line, the first scan line GL1' is the 4k+1th scan line GL4k+1, and the second scan line GL2' is the 4k+4th scan line GL4k+4 The third scan line GL3' is the 4k+2th scan line GL4k+2, and the fourth scan line GL4' is the 4k+3th scan line GL4k+3, where k ≧ 0 and is an integer.

In the first time period t1, the odd data lines DL output signals of the first polarity, even The plurality of data lines DL output signals of the second polarity; in the second time period t2, the odd data lines DL output signals of the second polarity, and the even data lines DL output signals of the first polarity, and the first polarity Contrary to the second polarity. The first polarity signal includes a first pre-charge signal Vp1' and a first data signal Vc1', a second pre-charge signal Vp2', and a second data signal Vc2'. The second polarity signal includes a third pre-charge signal Vp3' And the third data signal Vc3', the fourth pre-charge signal Vp4' and the fourth data signal Vc4'.

The dual-gate liquid crystal display panel may further include a last set of scan lines, including only two scan lines GL, and still drive with the same drive timing as in other sets of scan lines.

Thereby, the driving timing of the pre-charging can make the bit element of the pixel unit increase in advance, so that the pixel voltage can reach the target bit level earlier, avoiding the phenomenon of insufficient charging and lateral crosstalk.

While the invention has been described above by way of a preferred embodiment, the invention is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the claims.

GL1‧‧‧ first gate line

GL2‧‧‧Second gate line

GL3‧‧‧ third gate line

GL4‧‧‧4th gate line

DL1‧‧‧ first data line

DL2‧‧‧ second data line

T1‧‧‧ first time period

t2‧‧‧Second time period

Claims (10)

A driving method of a dual-gate liquid crystal display panel, wherein the double-gate liquid crystal display panel comprises m data lines, and the driving method comprises: sequentially, four scanning lines as a group, and first opening the first in the first time period. a scan line, inputting a first pre-charge signal to a pixel unit connected to the first scan line, and then turning on a second scan line, inputting a first data signal to a pixel unit connected to the first scan line, and simultaneously connecting the second scan The pixel unit of the line inputs a second pre-charge signal, turns off the first scan line and maintains the second scan line, inputs a second data signal to the pixel unit connected to the second scan line, and then turns off the second scan line; Turning on the third scan line in the second time period, inputting a third pre-charge signal to the pixel unit connected to the third scan line, and then turning on the fourth scan line, and inputting the pixel unit to the pixel unit connected to the third scan line a third data signal, at the same time, inputting a fourth pre-charge signal to the pixel unit connected to the fourth scan line, turning off the third scan line and maintaining the fourth scan line on, and connecting the fourth scan line The pixel unit inputs the fourth data signal, and then turns off the fourth scan line, wherein the pre-charge signal of each pixel unit is the same as the polarity of the data signal; in the first time period, each data line outputs the first polarity. The signal, in the second time period, each data line outputs a signal of the second polarity, and the first polarity is opposite to the second polarity. The driving method of the dual gate liquid crystal display panel of claim 1, wherein the dual gate liquid crystal display panel comprises n scan lines and a plurality of pixel units, and two adjacent row pixel units are coupled to the same strip Corresponding data lines, wherein the odd-numbered column pixel units are coupled to the corresponding odd-numbered scan lines, and the even-numbered column pixel units are coupled to the corresponding even-numbered scan lines, wherein m and n are positive integers. The method for driving a dual-gate liquid crystal display panel according to claim 2, wherein the double-gate liquid crystal display panel adopts a column inversion manner, and the first scan line is a 4k+1th scan line, the first The second scan line is the 4k+3th scan line, and the third scan line is the 4k+2th scan line, and the fourth scan line is the 4k+4th scan line, where k≧0 is an integer. The driving method of the dual-gate liquid crystal display panel of claim 1, wherein the first polarity signal includes the first pre-charge signal and the first data signal, the second pre-charge signal, and the second data The signal of the second polarity includes a third pre-charge signal and a third data signal, a fourth pre-charge signal and a fourth data signal. The driving method of the double-gate liquid crystal display panel of claim 2, wherein the pixel unit comprises: a thin film transistor switch, comprising: a control end coupled to a scan line; a first end coupled Connected to a data line, and a second end; a liquid crystal capacitor coupled between the second end of the thin film transistor and a common electrode voltage; and a storage capacitor coupled to the second end of the thin film transistor and Between the common electrode voltages. A driving method of a dual-gate liquid crystal display panel, wherein the double-gate liquid crystal display panel comprises m data lines, and the driving method comprises: sequentially, four scanning lines as a group, and first opening the first in the first time period. a scan line, inputting a first pre-charge signal to a pixel unit connected to the first scan line, and then turning on a second scan line, inputting a first data signal to a pixel unit connected to the first scan line, and simultaneously connecting the second scan The pixel unit of the line inputs a second pre-charge signal, turns off the first scan line and maintains the second scan line, inputs a second data signal to the pixel unit connected to the second scan line, and then turns off the second scan line; Opening a third scan line in the second time period, and connecting the pixel unit connected to the third scan line Inputting a third pre-charge signal, turning on the fourth scan line, inputting a third data signal to the pixel unit connected to the third scan line, and inputting a fourth pre-charge signal to the pixel unit connected to the fourth scan line, and turning off the The third scan line maintains the fourth scan line, inputs a fourth data signal to the pixel unit connected to the fourth scan line, and then turns off the fourth scan line, wherein the pre-charge signal and the data signal of each pixel unit The polarity is the same; in the first time period, the odd data lines output the first polarity signal, the even data lines output the second polarity signal; in the second time period, the odd data lines output the second polarity The signal, the even data line outputs a signal of the first polarity, and the first polarity is opposite to the second polarity. The method for driving a dual-gate liquid crystal display panel according to claim 6, wherein the dual-gate liquid crystal display panel comprises n scan lines and a plurality of pixel units, and two adjacent row pixel units are coupled to the same strip. Corresponding data lines, wherein the odd-numbered column pixel units are coupled to the corresponding odd-numbered scan lines, and the even-numbered column pixel units are coupled to the corresponding even-numbered scan lines, wherein m and n are positive integers. The driving method of the double-gate liquid crystal display panel according to claim 7, wherein the double-gate liquid crystal display panel adopts a single-point plus dot inversion manner, wherein the first column of pixel units and the 2m column of pixel units are point-reverse Turn, the remaining column pixel units are double-point inversion. The driving method of the double gate liquid crystal display panel according to claim 8, wherein the first scan line is a 4k+1th scan line, and the second scan line is a 4k+4th scan line, the third The scan line is the 4k+2th scan line, and the fourth scan line is the 4k+3th scan line, where k≧0 and is an integer. The driving method of the dual-gate liquid crystal display panel of claim 9, wherein the first polarity signal comprises a first pre-charge signal and a first data signal, a second pre-charge signal and a second data signal, the second polarity The signal includes a third pre-charge signal and a third data signal, a fourth pre-charge signal and a fourth data signal.