TWI436328B - Method for driving a display panel and display apparatus applying the same method - Google Patents

Description

Display panel driving method and display device using the same

The present invention relates to the field of display technology, and in particular to a driving method of a display panel and a display device using the same.

In the traditional column inversion driving technology, most of the first is to sequentially drive the odd-numbered scan lines in the display panel, and then sequentially drive the even-numbered scan lines, and the upper substrate of the display panel ( That is, the color filter substrate) and the lower substrate (ie, the thin film transistor array substrate) both adopt the same common potential. Figure 1 is a schematic diagram of the gate signal timing and common potential timing used for this driving technique. In FIG. 1, Rows[1], Row[3], and Row[5] indicate the gate signals corresponding to the first column of pixels, the third column of pixels, and the fifth column of pixels, respectively, indicating Row[2] ], Row[4] and Row[6] respectively represent the gate signals corresponding to the second column of pixels, the fourth column of pixels and the sixth column of pixels, and the indication Vcom is expressed as a common potential.

However, such a driving technique causes a problem that the odd-numbered pixel columns and the even-numbered pixel columns are inconsistent in brightness, and also causes a problem of uneven brightness (so-called Mura phenomenon) in the entire display panel. The above questions will be explained in detail below.

First, the pixel equivalent circuit of the conventional display panel using the column inversion driving technique will be described. Figure 2 shows the pixel equivalent circuit. Referring to FIG. 2, the pixel 206 is mainly composed of a thin film transistor 208, a storage capacitor 210, and a pixel capacitor 212. The gate of the thin film transistor 208 is electrically coupled to a scan line 202, and one of the source/drain electrodes of the thin film transistor 208 is electrically coupled to a data line 204. One end of the storage capacitor 210 is electrically coupled to the common electrode Vcom_Cst of the lower substrate, and one end of the pixel capacitor 212 is electrically coupled to the common electrode Vcom_Clc of the upper substrate. The common electrodes Vcom_Cst and Vcom_Clc are electrically coupled to the same common potential. In addition, the thin film transistor 208, the storage capacitor 210 and the pixel capacitor 212 are electrically coupled to each other, that is, a so-called pixel electrode.

Assuming that all the pixels of the conventional display panel are to display the same gray level, the voltage change on any data line and the voltage change of the common potential Vcom will be as shown in FIG. FIG. 3 is a diagram for explaining the problem that the luminance of the odd-numbered pixel column is inconsistent with the luminance of the even-numbered pixel column. Referring to FIG. 3, the screen display period of each screen is divided into two time segments, which are respectively indicated by the mark I and the mark II. N is a natural number. In the time zone I, the odd-numbered pixel columns are sequentially turned on, and in the time segment II, the even-numbered pixel columns are sequentially turned on. In addition, the waveform indicated by the indication 302 is represented as a voltage change of the common potential Vcom, the waveform indicated by the indication 304 is represented as a voltage change on any of the data lines, and the waveform indicated by the indication 306 is represented as any pixel sequence numbered as an odd number. The voltage on any of the pixel electrodes changes, and the waveform indicated by reference numeral 308 is represented as a voltage change on any of the pixel electrodes of any of the pixel columns numbered even. The above common potential Vcom has two levels. When the voltage on the data line is greater than the voltage of the common potential Vcom, the pixel loaded into the display data will exhibit a positive polarity; and when the voltage on the data line is less than the voltage of the common potential Vcom, the pixel loaded into the display data will be presented. Negative polarity.

Let us now look at the manner in which the voltage is described by waveform 306. In the time segment I of each picture, since only the odd-numbered pixel columns are sequentially turned on, the voltage level on each pixel electrode in these pixel columns is pulled to the voltage level on the data line. Whenever the time segment II enters the time segment II, since the odd-numbered pixel columns are all turned off, each storage capacitor in each pixel column and each pixel capacitor are floated. The (floating) state, and at this time, the common potential Vcom changes the level, so the voltage level on each of the pixel electrodes in the pixel columns fluctuates with the fluctuation of the common potential Vcom. As can be seen from the waveform 306 and the waveform 304, in the time segment II of each picture, there is a large pressure difference between each pixel electrode of the odd-numbered pixel column and the corresponding data line, thereby causing a large voltage difference. The thin film transistor leaks for a long time.

Next, look at the voltage variation pattern described by waveform 308. In the time segment II of each picture, since only the pixel columns of even number are sequentially turned on, the voltage level on each pixel electrode in these pixel columns is pulled to the voltage level on the data line. Whenever the time segment II enters the time segment II, the common potential Vcom changes the level so that the voltage level on each of the pixel electrodes in the even-numbered pixel column follows the common potential Vcom Changes in the changes. However, since these pixel columns are turned on, the voltage level on each of the pixel electrodes in these pixel columns is then pulled to the voltage level on the data line. Therefore, between each pixel electrode of the even-numbered pixel column and the corresponding data line, there is only a large voltage difference at the moment when the common potential Vcom changes level, so the thin film transistor in these pixel columns The leakage time is very short.

As can be seen from the above description, since the leakage time of the thin film transistor of the odd-numbered pixel array is different from the leakage time of the thin film transistor of the even-numbered pixel array, the luminance of the odd-numbered pixel array is caused. The problem that the brightness of the numbered pixels is inconsistent.

FIG. 4 is a diagram for explaining the problem of uneven brightness of the entire display panel. In FIG. 4, the same reference numerals as those in FIG. 3 are denoted as the same object. Different from FIG. 3, the waveform 302 in FIG. 4 shows the actual voltage change of the common potential Vcom. As can be seen from the figure, after the common potential Vcom changes level, the voltage difference between the common potential Vcom and the voltage on the data line is gradually reduced. This means that in the time zone II, the voltage of the display data loaded in the K+1th pixel column that is turned on is lower than the voltage of the display data loaded in the Kth pixel column that is turned on, wherein K is a natural number. Similarly, in the time zone I, the voltage of the display material loaded in the K+1th pixel column that is turned on is lower than the voltage of the display data loaded in the Kth pixel column that is turned on. In addition, during the screen display period of the same screen, the voltage of the display data loaded by the K-th odd-numbered pixel column that is turned on will be smaller than the pixel number of the K-th odd-numbered pixel column that is turned on. The voltage of the displayed data. As a result, the brightness of the display panel is decremented or increased from top to bottom, thereby causing a problem of uneven brightness.

SUMMARY OF THE INVENTION An object of the present invention is to provide a driving method of a display panel which can solve the problem of uneven brightness caused by a conventional column inversion driving technique.

Another object of the present invention is to provide a display device employing the above-described driving method.

The invention provides a driving method of a display panel. The display panel has a plurality of pixels, a plurality of data lines, a plurality of scan lines and a plurality of common electrodes. The pixels are arranged in a matrix, and the data lines are electrically coupled to the pixels, and the common electrodes are disposed in a lower substrate of the display panel. The driving method includes the steps of: providing a plurality of common potentials with different timings to the common electrode, wherein each common potential has a first level and a second level; and providing a plurality of timing differences during a picture display period The gate signal is connected to the scan line to turn on the pixel, and before the pixel is turned on, the level of the common potential corresponding to the pixel to be turned on is switched first.

In an embodiment of the driving method, the scan lines of the first group are sequentially driven, and then the scan lines of the second group are sequentially driven, and the scan lines of the first group are driven to be turned on. The common potential corresponding to the element exhibits the first level described above, and when the scan line of the second group is driven, the common potential corresponding to the opened pixel exhibits the second level.

In an embodiment of the driving method, the method further includes the steps of: providing a first polarity data signal to the data line to make a pixel corresponding to the first group of scan lines have a first polarity, and providing a second polarity data The signal is sent to the data line so that the pixels corresponding to the second group of scan lines have a second polarity.

In an embodiment of the driving method, the first group scan line is an odd number of scan lines, and the second group scan line is an even number of scan lines.

In an embodiment of the driving method, the first polarity is opposite to the polarity of the second polarity.

In an embodiment of the driving method, the method further includes the steps of: sequentially dividing the scan lines with odd numbers into a plurality of groups, and sequentially dividing the scan lines with the even number into a plurality of groups, wherein Each group includes N scan lines, and N is a natural number; and sequentially drives the scan lines in the group in a group one time, and one of the two groups adjacent in time The scan line numbers in the group are all odd, and the scan line numbers in the other group are all even, and when the drive number is an odd scan line, the common potential corresponding to the pixel being turned on presents the first bit. When the scan line with the even number is driven, the common potential corresponding to the pixel being turned on presents the second level described above.

In an embodiment of the driving method, the method further includes the steps of: providing a first polarity data signal to the data line to make a pixel corresponding to the odd scan line have a first polarity, and providing a second polarity data signal to the foregoing The data line is such that the pixels corresponding to the even scan lines have a second polarity, wherein the polarities of the first polarity and the second polarity are opposite.

The invention further provides a display device. The display device includes a display panel, a data driver, a scan driver, a timing controller, and a common potential supply circuit. The display panel has a plurality of pixels, a plurality of scan lines, a plurality of data lines, and a plurality of common electrodes. The pixels are arranged in a matrix, and the data lines and the scanning lines are electrically coupled to the pixels, and the common electrodes are disposed in a lower substrate of the display panel. The data driver is electrically coupled to the data line, and the scan driver is electrically coupled to the scan line. The timing controller is configured to control the scan driver to provide a plurality of gate signals with different timings to the scan line for turning on the pixel during a picture display period, and the timing controller is further configured to control the data driver to transmit the data line. Load the corresponding display data into the opened pixel. The common potential supply circuit is configured to provide a plurality of common potentials with different timings to the common electrode, wherein each common potential has a first level and a second level, and before the pixel is turned on, the common potential supply circuit First switch the level of the common potential corresponding to the pixel to be turned on.

In an embodiment of the above display device, the timing controller controls the scan driver to sequentially drive the scan lines of the first group, and then sequentially drive the scan lines of the second group, and when the scan driver drives the first group When the scan line of the group is scanned, the common potential corresponding to the pixel being turned on presents the first level, and when the scan driver drives the scan line of the second group, the common potential corresponding to the pixel being turned on presents the above-mentioned first Two standards.

In an embodiment of the above display device, the data driver provides a first polarity data signal to the data line such that pixels corresponding to the first group of scan lines have a first polarity and provide a second polarity data signal to the above The data lines are such that pixels corresponding to the second group of scan lines have a second polarity.

In an embodiment of the display device, the first group of scan lines is an odd number of scan lines, and the second group of scan lines is an even number of scan lines.

In an embodiment of the above display device, the first polarity is opposite to the polarity of the second polarity.

In an embodiment of the above display device, the timing controller divides the odd-numbered scan lines into a plurality of groups, and sequentially divides the even-numbered scan lines into a plurality of groups, each of which The group includes N scan lines, and N is a natural number. The timing controller further controls the scan driver to sequentially drive the scan lines in the group in a group manner, wherein the scan line numbers in one of the groups adjacent to each other in time are odd. The scanning line numbers in the other group are even numbers, and when the scanning driver drives the odd-numbered scanning lines, the common potential corresponding to the turned-on pixels presents the first level, and when the scanning driver drives the number When the scan line is an even number, the common potential corresponding to the turned-on pixel exhibits the second level described above.

In an embodiment of the above display device, the data driver provides a first polarity data signal to the data line such that a pixel corresponding to the odd scan line has a first polarity, and provides a second polarity data signal to the data line. The pixels corresponding to the even scan lines have a second polarity, wherein the first polarity is opposite to the polarity of the second polarity.

The method for solving the above problems is to provide a plurality of common electrodes in the lower substrate of the display panel, and the pixels electrically coupled to the same scan line are electrically coupled to the same common electrode. No common electrode is provided in the upper substrate of the display panel. Then, a plurality of common potentials having different timings are provided to the common electrode, and before the pixels are turned on, the level of the common potential corresponding to the pixel to be turned on is switched first. Since the voltage of the pixel electrode corresponding to the same scanning line changes with the change of the same common potential, the voltage difference between the pixel electrode corresponding to each scanning line and the common potential corresponding to each scanning line remains the same, thereby solving the problem. The problem is that the brightness of the odd-numbered picture column is inconsistent with the brightness of the even-numbered picture element column. Even if the common potential occurs in the case shown in FIG. 4, since the voltage difference between the pixel electrodes corresponding to the respective scanning lines and the common potential corresponding to the respective scanning lines remains the same, the brightness unevenness of the entire display panel is also solved. The problem.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

First, the display panel used in the present invention will be described. In the lower substrate of the display panel used in the present invention, a plurality of common electrodes are disposed, and the pixels electrically coupled to the same scan line are electrically coupled to the same common electrode. No common electrode is provided in the upper substrate of the display panel. Therefore, the pixel equivalent circuit of this display panel can be represented by FIG.

Figure 5 is a diagram showing the pixel equivalent circuit. Referring to FIG. 5, the pixel 506 is mainly composed of a thin film transistor 508 and a storage capacitor 510. The gate of the thin film transistor 508 is electrically coupled to a scan line 502, and one of the source/drain electrodes of the thin film transistor 508 is electrically coupled to a data line 504. One end of the storage capacitor 510 is electrically coupled to one of the common electrodes Vcom_Cst of the lower substrate. In addition, the thin film transistor 208 is electrically coupled to the storage capacitor 210, a so-called pixel electrode. Next, the driving method of this display panel will be described.

First embodiment:

In the display panel of this example, all of the pixels are in a conventional electrical coupling manner, that is, the pixel elements electrically coupled to the Kth scanning line are in the same column, where K is a natural number.

FIG. 6 is an explanatory diagram of a driving method of a display panel according to an embodiment of the present invention. In FIG. 6, the Row[1], Row[3], and Row[5] are respectively indicated as the gate signals corresponding to the first column of pixels, the third column of pixels, and the fifth column of pixels, respectively, indicating Row[2] ], Row[4] and Row[6] respectively represent the gate signals corresponding to the second column of pixels, the fourth column of pixels and the sixth column of pixels, indicating Vcom_Cst[1], Vcom_Cst[3] and Vcom_Cst[ 5] respectively represent the common potential corresponding to the first column of pixels, the third column of pixels and the fifth column of pixels, and the indications Vcom_Cst[2], Vcom_Cst[4] and Vcom_Cst[6] respectively represent the second column of pixels. The fourth column of pixels and the common potential corresponding to the sixth column of pixels.

As can be seen from FIG. 6, the driving method sequentially drives the scan lines of the first group sequentially, and then sequentially drives the scan lines of the second group. In this example, the scan lines of the first group are numbered as odd scan lines, that is, odd scan lines; and the scan lines of the second group are even scan lines, that is, even scan lines. It can also be seen from FIG. 6 that these common potentials have two levels (ie, high level and low level), and the timings of these common potentials are different. In addition, before the pixels to be turned on are turned on, the levels of the common potential corresponding to these pixels are switched first.

In the Nth picture, when the scan lines of the first group are driven, the common potential corresponding to the turned-on pixels is at a high level, and the data driver (not shown) provides the negative data signal to the display panel. a data line such that pixels corresponding to the first group of scan lines have a negative polarity; and in the Nth picture, when the scan lines of the second group are driven, the common potential corresponding to the turned-on pixels is low The data driver provides a positive polarity data signal to the data line in the display panel such that the pixels corresponding to the second group of scan lines have positive polarity. Of course, the polarity of the positive polarity and the negative polarity are opposite.

Similarly, in the (N+1)th picture, when the scan lines of the first group are driven, the common potential corresponding to the turned-on pixels exhibits a low level, and the data driver provides a positive polarity data signal to the display panel. a data line such that a pixel corresponding to the first group of scan lines has a positive polarity; and in the (N+1)th picture, when the scan lines of the second group are driven, the common potential system corresponding to the pixel is turned on A high level is presented, and the data driver provides a negative polarity data signal to the data line in the display panel such that the pixels corresponding to the second group of scan lines have a negative polarity.

Assuming that the display panel of this example has 480 common electrodes, the relationship of each common potential to the voltage of any of its corresponding pixel electrodes can be represented by FIG. In FIG. 7, the symbols Vcom_Cst[1], Vcom_Cst[3], and Vcom_Cst[479] indicate the common potentials corresponding to the first column of pixels, the third column of pixels, and the 477th column of pixels, respectively. The indications Vcom_Cst[2], Vcom_Cst[4] and Vcom_Cst[480] respectively represent the common potential corresponding to the second column of pixels, the fourth column of pixels and the forty-eighth column of pixels. As for the Vpixel[1], Vpixel[3], and Vpixel[479], respectively, the voltage of any of the pixel electrodes of the first column of pixels, the voltage of any of the pixel electrodes of the third column of pixels, and the fourth hundred and seventy. The voltage of any of the nineteen columns of pixels, and Vpixel[2], Vpixel[4], and Vpixel[480] indicate the voltage of any pixel of the second column of pixels, and the fourth column. The voltage of any of the pixel electrodes and the voltage of any of the pixels of the 480th column of pixels.

As shown in FIG. 7, since the voltage of the pixel electrode of the same pixel column changes with the same common potential, the voltage difference between the pixel electrode corresponding to each scanning line and the common potential corresponding to each scanning line is changed. Consistently, the problem that the brightness of the odd-numbered pixel columns is inconsistent with the brightness of the even-numbered pixel columns is solved. Even if the common potential occurs in the case shown in FIG. 4, since the voltage difference between the pixel electrodes corresponding to the respective scanning lines and the common potential corresponding to the respective scanning lines remains the same, the brightness unevenness of the entire display panel is also solved. The problem.

Second embodiment:

This embodiment mainly explains that the driving method described in FIG. 6 can also be applied to different pixel architectures, which is illustrated in FIG. 8. 8 is a schematic diagram of a pixel structure of a display panel. In FIG. 8, the symbol 802 is represented as a pixel, and the signs 811 to 816 are represented as data lines, and the labels Row[m-1], Row[m], and Row[m+1] are represented as scan lines, where m is a natural number. And Vcom_Cst[m] is indicated as a common electrode corresponding to the scan line Row[m]. As can be seen from FIG. 6, the pixels of the display panel are electrically coupled to the scan lines in a zigzag manner, so that any two adjacent pixels on the same scan line are located in different columns.

Implementing the driving method shown in FIG. 6 under such a pixel structure can achieve the dot inversion effect of the display panel. In this way, the effect can be averaged and the problem that the brightness of the odd-numbered pixel columns is inconsistent with the brightness of the even-numbered pixel columns can be further improved.

Third embodiment:

This embodiment mainly describes that the scan lines of the display panel described in the first embodiment may also be divided into more groups for driving, which is explained in FIG.

FIG. 9 is an explanatory diagram of a driving method of a display panel according to another embodiment of the present invention. In FIG. 9, the labels Row[1], Row[3], Row[5], and Row[7] indicate the first column of pixels, the third column of pixels, the fifth column of pixels, and the seventh column of pixels, respectively. Corresponding gate signals, labeled Row[2], Row[4], Row[6], and Row[8] respectively represent the second column of pixels, the fourth column of pixels, and the sixth column of pixels and corresponding The gate signal indicates that Vcom_Cst[1], Vcom_Cst[3], Vcom_Cst[5], and Vcom_Cst[7] respectively represent the first column of pixels, the third column of pixels, the fifth column of pixels, and the seventh column of pixels. Corresponding common potentials, and Vcom_Cst[2], Vcom_Cst[4], Vcom_Cst[6], and Vcom_Cst[8] indicate the second column of pixels, the fourth column of pixels, the sixth column of pixels, and the eighth column of painting, respectively. The common potential corresponding to the element.

As shown in FIG. 9, in this driving method, the scan lines with the odd number are sequentially divided into a plurality of groups, and the scan lines with the even number are sequentially divided into a plurality of groups, wherein each group The group includes 2 scan lines. Of course, each group may also include N scan lines as long as N is a natural number. Then, the scan lines in the group are sequentially driven in a group manner, and the scan line numbers in one group of the two groups adjacent in time are all odd, and the other group The scan lines are all even numbers, and when the scan number is an odd number, the common potential corresponding to the pixel being turned on is one of the common potentials, and when the scan number is even, the pixel is turned on. The common potential presents another level.

In the Nth picture, when the scan number is an odd number, the common potential corresponding to the pixel being turned on presents a high level, and the data driver (not shown) provides the negative data signal to the data in the display panel. Lines such that the pixels corresponding to the scan lines have a negative polarity; and in the Nth picture, when the scan lines with the even number are driven, the common potential corresponding to the turned-on pixels exhibits a low level, and the data driver The positive polarity data signals are provided to the data lines in the display panel such that the pixels corresponding to the scan lines have positive polarity. Of course, the polarity of the positive polarity and the negative polarity are opposite.

Similarly, in the (N+1)th picture, when the scan number is an odd number, the common potential corresponding to the turned-on pixel exhibits a low level, and the data driver provides the positive data signal to the data in the display panel. Lines such that the pixels corresponding to the scan lines have a positive polarity; and in the (N+1)th picture, when the scan lines of the even number are driven, the common potential corresponding to the turned-on pixels exhibits a high level. And the data driver provides a negative polarity data signal to the data lines in the display panel, so that the pixels corresponding to the scan lines have a negative polarity.

In this way, since the voltage on the data line is rotated once every N scan lines, the brightness of the odd-numbered pixel columns can be further improved to be inconsistent with the brightness of the even-numbered pixel columns. problem.

Moreover, in this example, the scan lines in each group are driven in a predetermined order, but the designer can also change the drive order of the scan lines in each group. Taking FIG. 9 as an example, the third scan line can be driven first, and then the first scan line can be driven. Next, the fourth scan line is driven first, and then the second scan line is driven. Of course, the timing of the common potential corresponding to each scan line also changes.

Through the teachings of the above embodiments, some basic steps of the driving method of the present invention can be summarized, as shown in FIG. FIG. 10 is a flow chart of a method of driving a display panel according to an embodiment of the invention. The display panel has a plurality of pixels, a plurality of data lines, a plurality of scan lines and a plurality of common electrodes, wherein the pixels are arranged in a matrix, and the data lines and the scan lines are electrically coupled to the pixels. The common electrodes are all disposed in the substrate below the display panel. The driving method includes the steps of: providing a plurality of common potentials having different timings to the common electrode, wherein each common potential has a first level and a second level (as shown in step S1002); and during a picture display period a plurality of gate signals having different timings are provided to the scan line for turning on the pixel, and before the pixel is turned on, switching the level of the common potential corresponding to the pixel to be turned on (step S1004) Shown).

Similarly, if a display device uses the driving method of the present invention to drive its display panel, some basic operational behaviors of the internal control circuit of the display device can also be summarized by the teachings of the above embodiments. This will be explained with reference to FIG. Please refer to FIG. 11, which is a schematic diagram of a display device. The display device includes a timing controller 1102, a data driver 1104, a scan driver 1106, a common potential supply circuit 1108, and a display panel 1110. The display panel 1110 has a plurality of pixels (as indicated by the numeral 1112), a plurality of data lines (as indicated by the numeral 1114), a plurality of scanning lines (as indicated by the numeral 1116), and a plurality of common electrodes (as indicated by the numeral 1118). ). The pixels are arranged in a matrix, and the data lines are electrically coupled to the pixels, and the common electrodes are disposed on a lower substrate (not shown) of the display panel 1110. The data driver 1104 is electrically coupled to the data line, and the scan driver 1106 is electrically coupled to the scan line.

The timing controller 1102 is electrically coupled to the data driver 1104 and the scan driver 1106, and is configured to control the scan driver 1106 to provide a plurality of gate signals with different timings to the scan line during a picture display period to enable the pixel. . The timing controller 1102 is further configured to control the data driver 1104 to load the corresponding display data into the opened pixel through the data line. The common potential supply circuit 1108 is configured to provide a plurality of common potentials with different timings to the common electrode, wherein each common potential has a first level and a second level. And before the pixel is turned on, the common potential supply circuit 1108 first switches the level of the common potential corresponding to the pixel to be turned on. It is worth mentioning that the common potential supply circuit 1108 can refer to the signal transmitted to the scan driver 1106 by the timing controller 1102 to determine when to switch the level of the common potential.

Of course, the timing controller 1102 may also divide the odd-numbered scan lines into a plurality of groups in the same manner as described in the third embodiment, and sequentially divide the scan lines with the even number into multiples. A group, wherein each group includes N scan lines, and N is a natural number. The timing controller 1102 can then control the scan driver 1106 to sequentially drive the scan lines in the group in a group manner, wherein the scan line numbers in one of the groups adjacent in time are two groups. All are odd, and the scan line numbers in the other group are even. And when the scan driver 1106 drives the odd-numbered scan lines, the common potential corresponding to the turned-on pixels assumes the first level, and when the scan driver 1106 drives the even-numbered scan lines, the opened pixels correspond to The common potential presents a second level.

In summary, the present invention solves the above problems by providing a plurality of common electrodes in the lower substrate of the display panel, and the pixels electrically coupled to the same scan line are electrically coupled to the same common electrode. No common electrode is provided in the upper substrate of the display panel. Then, a plurality of common potentials having different timings are provided to the common electrode, and before the pixels are turned on, the level of the common potential corresponding to the pixel to be turned on is switched first. Since the voltage of the pixel electrode corresponding to the same scanning line changes with the change of the same common potential, the voltage difference between the pixel electrode corresponding to each scanning line and the common potential corresponding to each scanning line remains the same, thereby solving the problem. The problem is that the brightness of the odd-numbered picture column is inconsistent with the brightness of the even-numbered picture element column. Even if the common potential occurs in the case shown in FIG. 4, since the voltage difference between the pixel electrodes corresponding to the respective scanning lines and the common potential corresponding to the respective scanning lines remains the same, the brightness unevenness of the entire display panel is also solved. The problem.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present 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 patent application.

202, 502, Row[m-1], Row[m], Row[m+1]. . . Scanning line

204, 504, 811~816, 1114. . . Data line

206, 506, 802, 1112. . . Pixel

208, 508. . . Thin film transistor

210, 510. . . Storage capacitor

212. . . Pixel capacitor

302~308. . . Waveform

1102. . . Timing controller

1104. . . Data driver

1106. . . Scan drive

1108. . . Common potential supply circuit

1110. . . Display panel

1116. . . Scanning line

1118, Vcom_Cst, Ccom_Clc, Vcom_Cst[m]. . . Common electrode

Row[1], Row[2], Row[3], Row[4], Row[5], Row[6], Row[7], Row[8]. . . Gate signal

S1002, S1004. . . step

Vcom, Vcom_Cst[1], Vcom_Cst[2], Vcom_Cst[3], Vcom_Cst[4], Vcom_Cst[5], Vcom_Cst[6], Vcom_Cst[7], Vcom_Cst[8], Vcom_Cst[479], Vcom_Cst[480 ]. . . Common potential

Vpixel[1], Vpixel[2], Vpixel[3], Vpixel[4], Vpixel[479], Vpixel[480]. . . Pixel electrode voltage

FIG. 1 is a schematic diagram of gate signal timing and common potential timing used by conventional driving techniques.

2 is a diagram showing a pixel equivalent circuit of a conventional display panel.

FIG. 3 is a diagram for explaining the problem that the luminance of the odd-numbered pixel columns is inconsistent with the luminance of the even-numbered pixel columns.

FIG. 4 is a view for explaining a problem that brightness unevenness occurs in the entire display panel.

FIG. 5 is a diagram showing a pixel equivalent circuit of a display panel used in the present invention.

FIG. 6 is an explanatory diagram of a driving method of a display panel according to an embodiment of the present invention.

Figure 7 illustrates the relationship of each common potential to the voltage of any of its corresponding pixel electrodes.

8 is a schematic diagram of a pixel structure of a display panel.

FIG. 9 is an explanatory diagram of a driving method of a display panel according to another embodiment of the present invention.

FIG. 10 is a flow chart of a method of driving a display panel according to an embodiment of the invention.

Figure 11 is a schematic illustration of a display device.

S1002, S1004. . . step

Claims (15)

A display panel driving method, the display panel has a plurality of pixels, a plurality of data lines, a plurality of scan lines and a plurality of common electrodes, the pixels are arranged in a matrix, the data lines and the scans The line is electrically coupled to the pixels, and the common electrodes are disposed in the substrate below the display panel. The driving method includes: providing a plurality of common potentials with different timings to the common electrodes, wherein each common potential Having a first level and a second level; and providing a plurality of timing different gate signals to the scan lines during a display period to turn on the pixels, and in the pixels Before turning on, first switch the level of the common potential corresponding to the pixel to be turned on. The driving method of the display panel according to claim 1, wherein the first group of scanning lines are sequentially driven, and then the scanning lines of the second group are sequentially driven, and the first driving is performed. When the scan line of the group is turned on, the common potential corresponding to the opened pixel presents the first level, and when the scan line of the second group is driven, the common potential corresponding to the opened pixel presents the second level. . The driving method of the display panel of claim 2, the driving method further includes: providing a first polarity data signal to the data lines to enable the pixels corresponding to the first group of scan lines to have a first polarity, providing a second polarity data signal to the data lines such that the pixels corresponding to the second group of scan lines have a second polarity. The driving method of the display panel according to the third aspect of the invention, wherein the first group of scanning lines is an odd number of scanning lines, and the second group of scanning lines is an even number of scanning lines. The driving method of the display panel according to claim 3, wherein the first polarity is opposite to the polarity of the second polarity. The method for driving a display panel according to claim 1, further comprising: sequentially dividing the scan lines numbered oddly into a plurality of groups, and sequentially dividing the scan lines numbered even into multiples. a group, wherein each group includes N scan lines, and N is a natural number; and sequentially drives the scan lines in the group in a group manner each time, and the two groups adjacent in time The scan line numbers in one group of the group are all odd, and the scan line numbers in the other group are all even, and when the scan number is an odd number, the common potential corresponding to the pixel being turned on presents When the first bit is used, and the scan line with the even number is driven, the common potential corresponding to the opened pixel presents the second level. The driving method of the display panel of claim 6, wherein the driving method further comprises: providing a first polarity data signal to the data lines to have the pixels corresponding to the odd scan lines have a first Polarity, providing a second polarity data signal to the data lines such that the pixels corresponding to the even scan lines have a second polarity, wherein the first polarity is opposite to the polarity of the second polarity. A display device includes: a display panel having a plurality of pixels, a plurality of scan lines, a plurality of data lines, and a plurality of common electrodes, wherein the pixels are arranged in a matrix, and the data lines and the scan lines are Electrically coupling the pixels; a data driver electrically coupled to the data lines; a scan driver electrically coupled to the scan lines; and a timing controller for controlling during a display period The scan driver provides a plurality of gate signals with different timings to the scan lines for turning on the pixels. The timing controller is further configured to control the data driver to load the corresponding display data through the data lines. a pixel that is turned on; and a common potential supply circuit for providing a plurality of common times of different timings to the common electrodes, wherein each common potential has a first level and a second level, and Before the pixels are turned on, the common potential supply circuit first switches the level of the common potential corresponding to the pixel to be turned on. The display device of claim 8, wherein the timing controller controls the scan driver to sequentially drive a first group of scan lines, and then sequentially drive a second group of scan lines. And when the scan driver drives the scan lines of the first group, the common potential corresponding to the turned-on pixels exhibits the first level, and when the scan driver drives the scan lines of the second group, the pixels are turned on. The corresponding common potential assumes the second level. The display device of claim 9, wherein the data driver provides a first polarity data signal to the data lines to cause the pixels corresponding to the first group of scan lines to have a first polarity. And providing a second polarity data signal to the data lines such that the pixels corresponding to the second group of scan lines have a second polarity. The display device of claim 10, wherein the first group of scan lines is an odd number of scan lines, and the second group of scan lines is an even number of scan lines. The display device of claim 10, wherein the first polarity is opposite to the polarity of the second polarity. The display device of claim 8, wherein the timing controller divides the odd-numbered scan lines into a plurality of groups, and sequentially divides the even-numbered scan lines into a plurality of groups. a group, wherein each group includes N scan lines, and N is a natural number, and the timing controller further controls the scan driver to sequentially drive the scan lines in the group in a group manner, wherein The scanning line numbers in one of the groups adjacent to each other in time are all odd, and the scanning line numbers in the other group are all even, and when the scanning driver drives the scanning lines numbered to be odd, The common potential corresponding to the turned-on pixel represents the first level, and when the scan driver drives the scan line numbered even, the common potential corresponding to the turned-on pixel exhibits the second level. The display device of claim 13, wherein the data driver provides a first polarity data signal to the data lines to cause the pixels corresponding to the odd scan lines to have a first polarity and provide A second polarity data signal is sent to the data lines such that the pixels corresponding to the even scan lines have a second polarity, wherein the first polarity is opposite to the polarity of the second polarity. The display device of claim 8, wherein the common electrodes are disposed in a substrate below the display panel.