CN106782420A - A kind of display panel, its driving method and display device - Google Patents

Abstract

The invention discloses a display panel, its driving method and a display device. During the display time of each frame, by loading data signals with polarity reversal times not more than three times on each data line, the driving method is the same as dot reversal. Compared with the driving method, it effectively reduces the number of polarity inversions of the data signal loaded on the data line, and greatly reduces the logic power consumption; The scanning order of the grid line groups of odd rows and the grid line groups of even rows can realize the time-sharing drive of odd and even rows; in addition, the number of grid lines contained in each grid line group is different in the display time of every two consecutive frames , it can realize that the pixels located in the same column have positively charged pixels and negatively charged pixels at any time, effectively avoiding the poor display phenomena such as crosstalk and flicker that often occur in the column inversion driving mode, and improving the quality of the display screen.

Description

A display panel, its driving method and display device

technical field

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

Background technique

During the driving process of the liquid crystal display, data signals need to be kept on the pixel electrodes to drive the liquid crystal molecules in each pixel to deflect under the action of an electric field, so as to realize image display. Usually, the data signal is a voltage signal, and the voltage signal can be divided into a DC voltage signal and an AC voltage signal; if a DC voltage signal is applied to the liquid crystal molecules for a long time, the liquid crystal molecules are easily damaged due to uneven polarization, resulting in poor picture quality. Therefore, it is necessary to drive the liquid crystal molecules by applying an AC voltage signal to ensure the quality of the display screen.

In the driving process of actual products, voltage signals with opposite polarities are usually applied to the liquid crystal molecules in each pixel every frame, that is, the polarity of the data signals on the pixel electrodes needs to be periodically reversed with certain regularity. Commonly used polarity inversion methods include frame inversion, dot inversion, column inversion, row inversion, etc., and the inversion methods usually used in existing liquid crystal displays are dot inversion and column inversion; , taking the pixel area shown in Figure 1 as an example, 11 is the data line, 12 is the gate line, and 13 is the pixel electrode; the feature of dot inversion is that the voltage polarities of any two adjacent pixel electrodes are different, such as As shown in Figure 2a, it can ensure that the LCD has a high-quality display screen and avoid problems such as crosstalk, flickering, and vertical lines. Poor capability; column inversion is the opposite of dot inversion, and the polarity change period of column inversion is longer, so the power consumption is lower, but because the voltage polarity of each column of pixel electrodes is the same, as shown in Figure 2b, As a result, the quality of the display screen is poor, and problems such as crosstalk, flicker, and vertical lines are prone to occur.

Based on this, how to reduce the power consumption of the liquid crystal display and improve the battery life while ensuring high-quality display images is a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

Embodiments of the present invention provide a display panel, a driving method thereof, and a display device to solve the problem of how to reduce power consumption of a liquid crystal display and improve battery life while ensuring high-quality display images in the prior art.

An embodiment of the present invention provides a method for driving a display panel. The display panel has a plurality of gate lines and a plurality of data lines, and all the gate lines are divided into a plurality of gate line groups; , the number of gate lines contained in each of the gate line groups is the same and no more than four; the number of gate lines contained in each of the gate line groups is different for every two consecutive frames of display time; the driving method includes:

During the display time of each frame, the gate line groups of odd rows and the gate line groups of even rows are scanned sequentially, and at the same time, data signals with polarity inversion times not greater than three times are applied to each of the data lines, The polarities of the data signals loaded by the adjacent two data lines are opposite, and when the polarity of the data signals is reversed, the gate line groups of the odd rows and the gate line groups of the even rows are changed. scan order.

In a possible implementation manner, in the above-mentioned driving method provided by the embodiment of the present invention, it further includes: there is a change from scanning the gate line groups of the even-numbered rows in the display time of one frame to scanning in the next frame During the display time, the polarity of the data signal applied to each of the data lines is maintained when the group of gate lines in odd rows is scanned.

In a possible implementation manner, in the above-mentioned driving method provided by the embodiment of the present invention, it further includes: within the display time of each frame, the polarity inversion time interval of the data signal loaded on each of the data lines is kept unanimous.

In a possible implementation manner, in the above-mentioned driving method provided by the embodiment of the present invention, within the display time of each frame, each data line is loaded with a data signal whose polarity inversion times is not more than three times, specifically including :

During the display time of each frame, a data signal whose polarity is reversed once is applied to each of the data lines.

In a possible implementation manner, in the above-mentioned driving method provided by the embodiment of the present invention, the number of gate lines contained in each of the gate line groups is the same in each display time interval of one frame.

In a possible implementation manner, in the above-mentioned driving method provided by the embodiment of the present invention, within the display time of one frame, the number of gate lines contained in each gate line group is one; The number of grid lines included in each grid line group is two.

In a possible implementation manner, the above-mentioned driving method provided by the embodiment of the present invention further includes: taking the display time of every four frames as a signal period; wherein, the display time of the first frame and the display time of the third frame The number of raster lines included in each raster line group within the time period is the same, and the number of raster lines included in each raster line group during the display time of the second frame and the display time of the fourth frame are the same;

During the display time of each frame, a data signal whose polarity is reversed once is applied to each of the data lines.

In a possible implementation manner, in the above driving method provided by the embodiment of the present invention, the number of gate lines contained in each of the gate line groups during the display time of the first frame and the display time of the third frame is one ; The number of grid lines included in each of the grid line groups during the display time of the second frame and the display time of the fourth frame is two.

The embodiment of the present invention also provides a display panel, and the display panel is driven by the above-mentioned driving method provided by the embodiment of the present invention.

An embodiment of the present invention also provides a display device, including the above-mentioned display panel provided by the embodiment of the present invention.

The beneficial effects of the present invention are as follows:

In the display panel, its driving method and display device provided by the embodiments of the present invention, all the gate lines of the display panel are firstly divided into a plurality of gate line groups; Data signals whose polarity inversion times are not more than three times, and the polarities of the data signals loaded on two adjacent data lines are opposite, making this driving method effectively reduce the data signal loaded on the data lines compared with the point inversion driving method The number of polarity inversions increases the change period of the data signal polarity, thereby greatly reducing the logic power consumption; at the same time, in the display time of each frame, when the data signal is inverting in polarity, the odd row is changed. The scanning order of the grid line group and the grid line group of the even row can realize the time-sharing drive of the odd and even row, so that the pixels in the same column have both positively charged pixels and negatively charged pixels at the same time; During the display time, the number of grid lines contained in each grid line group is the same and not more than four. During the display time of two consecutive frames, the number of grid lines contained in each grid line group is different, so that the pixels in the same column can be There are positively charged pixels and negatively charged pixels at any time, which effectively avoids poor display phenomena such as crosstalk and flicker that often occur in the column inversion driving method, and improves the quality of the displayed image.

Description of drawings

FIG. 1 is a schematic structural diagram of a pixel region in the prior art;

2a and 2b are schematic diagrams of the inversion results of pixel electrodes in the display time of continuous frames in the prior art;

FIG. 3 is a flowchart of a method for driving a display panel provided in an embodiment of the present invention;

4 is a schematic diagram of the polarity of the pixel electrode before charging provided in an embodiment of the present invention;

FIG. 5a, FIG. 5c, FIG. 5e and FIG. 5g are timing diagrams provided in the embodiment of the present invention;

Fig. 5b, Fig. 5d, Fig. 5f, Fig. 5h and Fig. 5i are schematic diagrams of the polarity change of the column of pixel electrodes during the scanning process of each frame provided in the embodiment of the present invention;

FIG. 6 is a schematic diagram of the polarity of the pixel electrodes after the scanning of the fifth frame is completed according to the embodiment of the present invention.

detailed description

The specific implementation manners of a display panel, a driving method thereof, and a display device provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

An embodiment of the present invention provides a method for driving a display panel. The display panel has multiple gate lines and multiple data lines, and all the gate lines are divided into multiple gate line groups; The number of grid lines included in the group is the same and not more than four; the number of grid lines included in each grid line group is different in each display time of two consecutive frames; as shown in Figure 3, the driving method may include:

S301. During the display time of each frame, sequentially scan the grid line groups of odd rows and even rows, and at the same time, load data signals with polarity inversion times not greater than three times on each data line, and two adjacent The polarity of the data signal loaded by the data line is opposite;

S302. When the polarity of the data signal is reversed, change the scanning order of the odd-numbered row of gate line groups and the even-numbered row of gate line groups.

In the above-mentioned driving method provided by the embodiment of the present invention, all the gate lines of the display panel are firstly divided into multiple gate line groups; Three data signals, and the polarities of the data signals loaded on two adjacent data lines are opposite, so that compared with the point inversion driving method, this driving method effectively reduces the number of polarity inversions of the data signals loaded on the data lines, increasing The change period of the polarity of the data signal is shortened, thereby greatly reducing the logic power consumption; at the same time, during the display time of each frame, when the polarity of the data signal is reversed, the gate line group of the odd row and the grid line of the even row are changed. The scanning order of the gate line group can realize the time-sharing drive of the odd and even lines, so that the pixels in the same column have both positive and negative charge pixels at the same time; in addition, through the display time of the same frame, each gate line The number of grid lines contained in each group is the same and not more than four, and the number of grid lines contained in each grid line group is different in the display time of two consecutive frames, so that the pixels in the same column can have positive charges at any time Pixels and negatively charged pixels effectively avoid poor display phenomena such as crosstalk and flicker that often occur in the column inversion driving method, and improve the quality of the display picture.

It should be noted that, within the display time of each frame, the raster line groups of odd-numbered rows and the raster line groups of even-numbered rows are scanned sequentially, that is, each raster line group of odd-numbered rows is scanned first, and then each raster line group of even-numbered rows is scanned. Of course, in the actual driving process of the display panel, it is not limited to the above-mentioned method, and it is also possible to scan each grid line group of even-numbered rows first, and then scan each grid line group of odd-numbered rows , which is not limited here; therefore, the following will be described in detail by taking the scanning of each raster line group of odd-numbered rows first within the start time of one frame as an example.

In specific implementation, in order to reduce the logic power consumption as much as possible, the above driving method provided by the embodiment of the present invention may also include:

When changing from scanning the grid line groups of even rows in the display time of one frame to scanning the grid line groups of odd rows in the display time of the next frame, the polarity of the data signal loaded on each data line is maintained .

Specifically, in the handover stage of the display time of two consecutive frames, that is, the end time of one frame and the start time of the next frame, the polarity of the data signal loaded by the data line can be made the same; of course, in the actual display panel driving In the process, there is also the data loaded by each data line when changing from scanning the raster line group of the even-numbered row within the display time of one frame to scanning the raster line group of the odd-numbered row within the display time of the next frame. The polarity of the signal is different, that is, the end time of one frame is different from the start time of the next frame, and the polarity of the data signal loaded by the data line is different; but in order to further reduce the number of data signal polarity inversions, reduce the logic as much as possible Power consumption, when changing from scanning the grid line group of even rows in the display time of one frame to scanning the grid line group of odd rows in the display time of the next frame, the data loaded on each data line can be kept the polarity of the signal.

During specific implementation, in the above-mentioned driving method provided by the embodiment of the present invention, it may also include:

During the display time of each frame, the polarity inversion time intervals of the data signals loaded on the data lines are consistent.

Specifically, within the display time of each frame, the polarity inversion time intervals of the data signals loaded on each data line are kept consistent, that is, the display time of each frame is equally divided; and when the polarity inversion times of the data signals are not greater than Three times, the display time of each frame can be divided into four sub-time periods at most, of course, it can also be divided into two sub-time periods, or three sub-time periods, so as to effectively control the polarity inversion of the data signal, It is not limited here.

Specifically, in the step S301 of the above-mentioned driving method provided by the embodiment of the present invention, within the display time of each frame, load data signals with polarity inversion times not more than three times to each data line, which may specifically include:

In the display time of each frame, a data signal whose polarity is reversed once is applied to each data line.

Preferably, in order to reduce the logic power consumption as much as possible, close to the power consumption level of column inversion, the polarity of the data signal can be reversed once during the display time of each frame, that is, only the The polarity of the data signal is reversed from positive to negative, or from negative to positive, which is equivalent to dividing the display time of one frame into two sub-time periods; The scanning order of the raster line groups only needs to be changed once.

For example, in the first sub-time period of a frame, when the grid line groups of odd-numbered rows are scanned, and the polarity of the data signal loaded by the data line is positive, in the second sub-time period, the even-numbered rows Each grid line group of the odd row is scanned, and the polarity of the data signal loaded by the data line is negative; on the contrary, in the first sub-time period, each grid line group of the odd row is scanned, and the data signal loaded by the data line is negative. When the polarity of the grid line is negative, in the second sub-time period, each grid line group of the even row is scanned, and the polarity of the data signal loaded on the data line is positive.

In specific implementation, in order to reduce the amount of calculation when driving the display panel and improve the calculation efficiency when driving, in the above-mentioned driving method provided by the embodiment of the present invention, in the display time of every interval of one frame, each gate line group Contains the same number of gridlines.

Specifically, in the display time of one frame, the number of gate lines included in each raster line group is one; in the display time of the next frame, the number of raster lines included in each raster line group is two.

Of course, in the display time of one frame, the number of grid lines included in each grid line group can be one or two; in the display time of the next frame, the number of grid lines included in each grid line group can be three, or four; in short, in the case that the number of grid lines included in each raster line group is not more than four, as long as it can be guaranteed that the number of raster lines included in each raster line group is the same in the display time of each frame.

In specific implementation, in the above-mentioned driving method provided by the embodiment of the present invention, it may also include: taking the display time of every four frames as a signal period; wherein, the display time of the first frame and the display time of the third frame The number of grid lines included in each grid line group is the same, and the number of grid lines included in each grid line group is the same during the display time of the second frame and the display time of the fourth frame;

In the display time of each frame, a data signal whose polarity is reversed once is applied to each data line.

Specifically, in the above driving method provided by the embodiment of the present invention, the number of gate lines included in each gate line group during the display time of the first frame and the display time of the third frame is one; Each raster line group includes two raster lines in the display time of the fourth frame.

The above-mentioned driving method provided by the embodiments of the present invention will be described in detail below in conjunction with specific embodiments.

Embodiment one:

In this embodiment, the first frame is taken as the initial frame, and the display time of the second frame to the fifth frame is one signal period as an example, and a column of pixel electrodes ( In the dotted line box), the timing diagrams shown in 5a, 5c, 5e and 5g, and the schematic diagrams of the polarity changes of the column pixel electrodes during each frame scanning process shown in Figures 5b, 5d, 5f, 5h and 5i; wherein, The four columns of pixel electrodes from left to right in Figures 5b, 5d, 5f, 5h, and 5i respectively indicate when a certain frame is refreshed to the second, fourth, sixth, and eighth gate lines. The polarity of the pixel electrode; divide the display time of one frame into two sub-time periods, and in the display time of one frame, the number of gate lines contained in each gate line group is one, and in the display time of the next frame, The number of grid lines included in each grid line group is two; before each pixel electrode is charged, the polarity of each pixel electrode is a random value, represented by R; The polarity of each pixel electrode corresponding to the pixel electrode shown is as shown in FIG. 6 .

In the display time of the first frame, as shown in the timing diagram in Figure 5a, in the first sub-time period, the data line is loaded with a positive polarity data signal, and each grid line group of odd rows (each grid line group includes One grid line) is scanned in sequence; in the second sub-time period, the data line is loaded with a negative polarity data signal, and each grid line group (each grid line group contains one grid line) of even rows is scanned in sequence; in the first During the frame scanning process, the polarity change of the pixel electrodes in this column is shown in Figure 5b, and when the first frame scanning ends, the polarities of any two adjacent pixel electrodes in this column of pixel electrodes are opposite, that is, the point Inversion mode.

In the display time of the second frame, as shown in the timing diagram in Figure 5c, in the first sub-time period, the data line is loaded with a positive polarity data signal, and each grid line group of odd rows (each grid line group includes Two grid lines) are scanned in sequence; in the second sub-time period, the data line is loaded with a negative polarity data signal, and each grid line group (each grid line group contains two grid lines) of even rows is scanned in sequence; During the scanning process of the second frame, the polarity of the pixel electrodes in the column changes as shown in FIG. 5 d , and after the scanning of the second frame ends, the polarity of the pixel electrodes in the column of pixel electrodes is in a two-row dot inversion mode.

In the display time of the third frame, as shown in the timing diagram in Figure 5e, in the first sub-time period, the data line is loaded with a negative polarity data signal, and each grid line group of odd rows (each grid line group includes One grid line) is scanned in sequence; in the second sub-time period, the data line is loaded with a positive polarity data signal, and each grid line group (each grid line group includes a grid line) of the even row is scanned in sequence; in the third sub-time period During the frame scanning process, the polarity change of the pixel electrodes in this column is shown in Figure 5f, and after the third frame scanning ends, the polarities of any two adjacent pixel electrodes in this column of pixel electrodes are opposite, that is, the point Inversion mode; at the same time, the polarity of the pixel electrodes in this column is exactly opposite to the polarity of the pixels after the scanning of the first frame ends.

In the display time of the fourth frame, as shown in the timing diagram in Figure 5g, in the first sub-time period, the data line is loaded with a negative polarity data signal, and each grid line group of odd rows (each grid line group includes two grid lines) are scanned sequentially; in the second sub-time period, the data lines are loaded with positive polarity data signals, and the grid line groups (each grid line group includes two grid lines) of the even rows are scanned in sequence; During the four-frame scanning process, the polarity change of the pixel electrodes in this column is shown in Figure 5h, and after the fourth frame scanning ends, the polarity of the pixel electrodes in the column of pixel electrodes is a two-row dot inversion mode; at the same time, The polarity of the pixel electrodes in this row is exactly opposite to the polarity of the pixels after the scanning of the second frame ends.

During the display time of the fifth frame, continue to adopt the timing diagram shown in Figure 5a, in the first sub-time period, the data line is loaded with a positive polarity data signal, and each grid line group of odd rows (each grid line group contains a grid line) to scan in sequence; in the second sub-time period, the data line is loaded with a negative polarity data signal, and each grid line group (each grid line group contains a grid line) in the even row is scanned in sequence; in the second sub-time period During the five-frame scanning process, the polarity change of the pixel electrodes in this column is shown in Figure 5i, and after the fifth frame scanning ends, the polarities of any two adjacent pixel electrodes in this column of pixel electrodes are opposite, that is, Dot inversion mode; at the same time, the polarity of the pixel electrodes in this column is the same as that of the pixels after the scanning of the first frame ends.

Therefore, from the second frame to the fifth frame is a signal period, so that the polarity of each pixel electrode at the end of the second frame is the same as that of each pixel electrode at the end of the fifth frame, and they are all in the subsequent charging process. Each pixel electrode is repeatedly charged according to the signal cycle; in addition, from the perspective of the polarity change of each pixel electrode in the entire signal cycle, among the pixel electrodes with positive polarity and the pixel electrodes with negative polarity, the few pixel electrodes are The ratio between the polarity of the polarity and the polarity of the majority of the pixel electrodes is at least 1:3, and no matter what moment, the ratio changes between 1:1 and 1:3; while in the dot inversion mode Below, the ratio between the pixel electrodes of positive polarity and the pixel electrodes of negative polarity is always 1:1. Therefore, the driving method in this embodiment is close to the driving method of dot inversion mode, which greatly improves the quality of the display screen. At the same time, the driving method in this embodiment greatly reduces the logic power consumption by reducing the number of polarity inversions of the data signal, and is close to the power consumption level of the column inversion, thereby improving the battery life.

Based on the same inventive concept, an embodiment of the present invention further provides a display panel, and the display panel is driven by the above-mentioned driving method provided by the embodiment of the present invention. Of course, the display panel may be any product or component used to realize display functions, such as a liquid crystal display panel, an electroluminescent display panel, or the like.

Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the above-mentioned display panel provided by the embodiment of the present invention. The display device can be any product or component with a display function such as a mobile phone, a tablet computer, a notebook computer, a desktop computer, a TV, a navigator, and the like. Since the problem-solving principle of the display device is similar to that of the display panel, the specific implementation of the display device can refer to the above-mentioned implementation of the display panel, and repeated descriptions will not be repeated.

Embodiments of the present invention provide a display panel, a driving method thereof, and a display device. Firstly, all the gate lines of the display panel are divided into a plurality of gate line groups; Data signals whose polarity inversion times are not more than three times, and the polarities of the data signals loaded on two adjacent data lines are opposite, making this driving method effectively reduce the data signal loaded on the data lines compared with the point inversion driving method The number of polarity inversions increases the change period of the data signal polarity, thereby greatly reducing the logic power consumption; at the same time, in the display time of each frame, when the data signal is inverting in polarity, the odd row is changed. The scanning order of the grid line group and the grid line group of the even row can realize the time-sharing drive of the odd and even row, so that the pixels in the same column have both positively charged pixels and negatively charged pixels at the same time; During the display time, the number of grid lines contained in each grid line group is the same and not more than four. During the display time of two consecutive frames, the number of grid lines contained in each grid line group is different, so that the pixels in the same column can be There are positively charged pixels and negatively charged pixels at any time, which effectively avoids poor display phenomena such as crosstalk and flicker that often occur in the column inversion driving method, and improves the quality of the displayed image.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. A driving method of a display panel, characterized in that, the display panel has a plurality of gate lines and a plurality of data lines, and all of the gate lines are divided into a plurality of gate line groups; within the display time of the same frame , the number of gate lines contained in each of the gate line groups is the same and no more than four; the number of gate lines contained in each of the gate line groups is different for every two consecutive frames of display time; the driving method includes: During the display time of each frame, the gate line groups of odd rows and the gate line groups of even rows are scanned sequentially, and at the same time, data signals with polarity inversion times not greater than three times are applied to each of the data lines, The polarities of the data signals loaded by the adjacent two data lines are opposite, and when the polarity of the data signals is reversed, the gate line groups of the odd rows and the gate line groups of the even rows are changed. scan order. 2. The driving method according to claim 1, further comprising: changing from scanning the grid line groups of the even-numbered rows within the display time of one frame to scanning the groups of odd-numbered rows within the display time of the next frame When the gate line group in a row is scanned, the polarity of the data signal applied to each of the data lines is maintained. 3 . The driving method according to claim 1 , further comprising: keeping the polarity inversion time intervals of the data signals loaded on the data lines consistent within the display time of each frame. 4 . 4. The driving method according to claim 3, wherein, within the display time of each frame, loading data signals with polarity inversion times no more than three times to each of the data lines, specifically comprising: During the display time of each frame, a data signal whose polarity is reversed once is applied to each of the data lines. 5 . The driving method according to claim 1 , wherein the number of gate lines included in each of the gate line groups is the same in each display time interval of one frame. 6 . 6. The driving method according to claim 5, characterized in that, within the display time of one frame, the number of gate lines included in each group of gate lines is one; within the display time of the next frame, each of the The number of grid lines included in the grid line group is two. 7. The driving method according to any one of claims 1-6, further comprising: taking the display time of every four frames as a signal period; wherein, the display time of the first frame and the display time of the third frame The number of raster lines included in each raster line group within the time period is the same, and the number of raster lines included in each raster line group during the display time of the second frame and the display time of the fourth frame are the same; During the display time of each frame, a data signal whose polarity is reversed once is applied to each of the data lines. 8. driving method as claimed in claim 7 is characterized in that, the grid line quantity that each described grid line group comprises in the display time of the first frame and the display time of the 3rd frame is one; The number of grid lines included in each of the grid line groups during the display time and the display time of the fourth frame is two. 9. A display panel, characterized in that the display panel is driven by the driving method according to any one of claims 1-8. 10. A display device, comprising the display panel according to claim 9.