CN114999358A - Display panel, driving method thereof and display device - Google Patents

Abstract

Embodiments of the present invention disclose a display panel, a driving method thereof, and a display device. The display panel includes: a plurality of pixels arranged in a preset regularity; a plurality of data lines, the data lines extending from one end of the display panel to the other end of the display panel; one of the data lines and part of the The pixel is electrically connected; the voltage on the data line determines the luminous brightness of the pixel; a data driving module is electrically connected to the plurality of data lines; the data driving module is used to provide the data line with the data of the pixel The auxiliary driving module is electrically connected to the plurality of data lines; the auxiliary driving module is used to provide auxiliary charging and discharging voltages to the data lines to assist the data lines to perform charging and discharging. Compared with the prior art, the embodiment of the present invention improves the display uniformity problem caused by the gray-scale voltage charge-discharge delay.

Description

Display panel and driving method thereof, and display device

technical field

Embodiments of the present invention relate to the field of display technology, and in particular, to a display panel, a method for driving the same, and a display device.

Background technique

With the continuous development of display technology, people have higher and higher requirements for display panels. Among them, the diversification of the display panel and the high display quality have always been the goals pursued by the major panel manufacturers.

In the prior art, the product types of display panels are becoming more and more abundant. Taking flexible curling products as an example, the biggest advantage is that they can be freely curled and stretched, which can save use space when not in use. However, due to the long length of the flexible curly product, the voltage drop (RC Loading) of the data line is too large, resulting in a charge-discharge delay in the gray-scale voltage, which affects the display uniformity of the display panel.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a display panel, a driving method thereof, and a display device, so as to improve the display uniformity problem caused by the gray-scale voltage charge-discharge delay.

To achieve the above technical purpose, the embodiments of the present invention provide the following technical solutions:

A display panel, comprising:

Multiple pixels arranged in a preset pattern;

a plurality of data lines, the data lines extend from one end of the display panel to the other end of the display panel; one of the data lines is electrically connected to some of the pixels; the voltage on the data lines determines the pixels luminous brightness;

a data driving module, which is electrically connected to the plurality of data lines; the data driving module is used for providing the data lines with gray-scale voltages required by the pixels;

The auxiliary driving module is electrically connected to the plurality of data lines; the auxiliary driving module is used for providing auxiliary charging and discharging voltages to the data lines, so as to assist the data lines to perform charging and discharging.

Optionally, the data driving module and the auxiliary driving module are respectively connected to different positions of the data line;

Preferably, the data driving module is connected to one end of the data line, and the auxiliary driving module is connected to the other end of the data line.

Optionally, the data drive module is integrated in a data drive chip; the auxiliary drive module is integrated in an auxiliary drive chip;

Preferably, the data driving chip is located close to one end of the data line; the auxiliary driving chip is located close to the other end of the data line.

Optionally, the display panel is a flexible curly display panel, and the data lines extend along a long side of the display panel.

Optionally, the data driving module receives image data, converts the image data into a gray-scale voltage required by each of the pixels; and converts the gray-scale variation of two adjacent stages on the data line or The gray-scale voltage variation is sent to the auxiliary driving module;

The auxiliary driving module charges and discharges the corresponding data lines according to the gray-scale variation or the gray-scale voltage variation;

Preferably, one data line is connected to a column of the pixels; two adjacent stages on the data line are driving stages of the pixels in two adjacent rows.

Optionally, the gray-scale variation or the gray-scale voltage variation determines the charging and discharging time of the data line by the auxiliary driving module;

Wherein, the larger the gray-scale variation or the gray-scale voltage variation, the longer the charging and discharging time of the auxiliary drive module; the smaller the gray-scale variation or the gray-scale voltage variation, the longer the auxiliary driving module The shorter the charging and discharging time;

Preferably, the auxiliary drive module includes a first switch unit, a second switch unit and a control unit; the first switch unit outputs a first voltage for charging under the control of the control unit; the first switch unit outputs a first voltage for charging; Under the control of the control unit, the two switch units output a second voltage for discharging; and the control unit controls the first switch unit or the The turn-on time of the second switch unit.

Optionally, the gray-scale variation or the gray-scale voltage variation determines the charging and discharging voltage of the data line by the auxiliary driving module;

The greater the gray-scale variation or the gray-scale voltage variation, the greater the difference between the charge-discharge voltage output by the auxiliary driving module and the gray-scale voltage output by the data driving module; the gray-scale variation or the gray-scale voltage The smaller the variation, the smaller the difference between the charge-discharge voltage output by the auxiliary driving module and the gray-scale voltage output by the driving module.

Optionally, if the gray-scale voltage of the pixel is negatively correlated with its gray-scale, when the gray-scale variation is greater than a critical value, the auxiliary driving module discharges the data line; When the step change amount is less than a critical value, the auxiliary driving module charges the data line;

If the gray-scale voltage of the pixel has a positive correlation with its gray-scale, the auxiliary driving module discharges the data line when the gray-scale variation is less than a threshold; and when the gray-scale variation is greater than a threshold value, the auxiliary driving module discharges the data line.

Correspondingly, the present invention also provides a method for driving a display panel according to any embodiment of the present invention, including:

When driving a pixel, the data driving module provides the data line with a gray-scale voltage required by the pixel; the auxiliary driving module provides an auxiliary charging and discharging voltage to the data line to assist the data line in charging discharge.

Correspondingly, the present invention also provides a display device including the display panel according to any embodiment of the present invention.

In the embodiment of the present invention, an auxiliary driving module is added in the display panel, and the auxiliary driving module is electrically connected to the data line, and is used for providing auxiliary charging and discharging voltage to the data line, and the auxiliary data line is charged and discharged. Compared with the prior art, the embodiment of the present invention increases the charging and discharging path of the data line, which is beneficial to shorten the charging and discharging time of the data line, alleviate the problem of the charging and discharging delay existing in the data line, thereby improving the uniform display of the display panel. sex. Especially for a display panel with a longer longitudinal direction, since the uniformity problem is more serious, the improvement effect of the embodiment of the present invention is more obvious.

Description of drawings

FIG. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

6 is a schematic structural diagram of an auxiliary drive module provided by an embodiment of the present invention;

FIG. 7 is a schematic circuit diagram of a pixel according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a driving timing of a pixel according to an embodiment of the present invention;

FIG. 9 is a schematic circuit diagram of another pixel according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

As described in the background art, when the conventional display panel is long in the longitudinal direction, the data lines have a delay in charging and discharging, which affects the display uniformity of the display panel. The inventors found that the charging time of the data line can be shortened by performing auxiliary charging and discharging on the data line, and the charging and discharging delay existing in the data line can be compensated. The realization of the auxiliary charging and discharging function for the data line is performed by the auxiliary driving module. The specific instructions are as follows:

FIG. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention. Referring to FIG. 1 , the display panel includes: a plurality of pixels 10 , a plurality of data lines 20 , a data driving module 31 and an auxiliary driving module 32 arranged in a preset regularity.

Wherein, since the embodiment of the present invention is applicable to a display panel with any arrangement, the preset arrangement rule of the pixels 10 may be any pixel arrangement rule. The preset pixel arrangement rule may be, for example, standard RGB arrangement, RGBPenTile arrangement, RGB Delta arrangement, RGBW arrangement, RGB S-Strip arrangement, and the like.

The data line 20 extends from one end of the display panel to the other end of the display panel. Illustratively, the data lines 20 extend along the long sides of the display panel or extend along the short sides of the display panel. Due to the existence of RC loading, the longer the data line 20 extends, the more serious the charge-discharge delay at the far end is. Therefore, regardless of whether the data line 20 extends along the long side or the short side, the problem of charging and discharging delay will occur at the far end. The longer the length of the data line 20 is, the more serious the problem of charging and discharging delay is. Those skilled in the art can understand that the embodiments of the present invention can not only improve the uniformity problem existing in the data line 20 extending along the long side, but also improve the uniformity problem existing in the data line 20 extending along the short side.

A data line 20 is electrically connected to some of the pixels 10 , and the voltage on the data line 20 determines the luminance of the pixels 10 . Exemplarily, one data line 20 is electrically connected to one column of pixels 10 in the display panel. In one frame, the data lines 20 sequentially supply gray-scale voltages to each pixel 10, so that the pixels 10 emit a predetermined gray-scale brightness. Since all the pixels 10 in the row of pixels 10 have different brightness, the gray-scale voltage on the data line 20 needs to be charged and discharged in real time to meet the requirements of the pixels 10 for the gray-scale voltage. However, there is a delay in the process of charging and discharging the data line 20. If the technical solution provided by the embodiment of the present invention is not adopted, the resulting problem is that the charging and discharging of the data line 20 has not been completely transmitted to the remote end. Before, the data lines 20 have started to drive the pixels 10 . That is to say, before the remote voltage of the data line 20 has reached the preset gray-scale voltage, the data line 20 has already started to drive the pixel 10, resulting in deviation of the gray-scale voltage of the driving pixel 10, resulting in uniform display of the display panel. Sexual issues.

The data driving module 31 is electrically connected to the plurality of data lines 20 ; the data driving module 31 is used to provide the data lines 20 with gray-scale voltages required by the pixels 10 . Exemplarily, the mainboard transmits the image data to the data driving module 31 , and the data driving module 31 converts the image data into grayscale voltages required by each pixel 10 ; and transmits the grayscale voltages to the corresponding data lines 20 .

The auxiliary driving module 32 is electrically connected to the plurality of data lines 20 ; the auxiliary driving module 32 is used for providing auxiliary charging and discharging voltages to the data lines 20 to assist the data lines 20 to perform charging and discharging. The auxiliary driving module 32 has different functions from the data driving module 31 , and serves as a supplementary module or a subordinate module of the data driving module 31 , and is used for auxiliary charging and discharging of the data line 20 to shorten the charging and discharging time of the data line 20 . Exemplarily, when a certain data line 20 needs to be discharged, the auxiliary driving module 32 provides a negative voltage to the data line 20, so that the data line 20 is rapidly discharged. The data driving module 31 provides the gray-scale voltage to ensure the accuracy of the gray-scale voltage on the data line 20; on the contrary, when a certain data line 20 needs to be charged, the auxiliary driving module 32 provides a positive voltage to the data line 20 to The data line 20 is rapidly charged, and the positive voltage is removed after charging for a preset time, and the data driving module 31 still provides the gray-scale voltage to ensure the accuracy of the gray-scale voltage on the data line 20 .

To sum up, in the embodiment of the present invention, an auxiliary driving module 32 is added to the display panel. The auxiliary driving module 32 is electrically connected to the data line 20 and is used to provide auxiliary charging and discharging voltage to the data line 20, and the auxiliary data line 20 is charged and discharged. Compared with the prior art, the embodiment of the present invention increases the charging and discharging paths of the data lines 20 , which is beneficial to shorten the charging and discharging time of the data lines 20 and alleviate the problem of the charging and discharging delay existing in the data lines 20 , thereby improving the display panel. Uniformity of display. Especially for a display panel with a longer longitudinal direction, since the uniformity problem is more serious, the improvement effect of the embodiment of the present invention is more obvious.

Continuing to refer to FIG. 1 , on the basis of the foregoing embodiments, optionally, the data driving module 31 and the auxiliary driving module 32 are respectively connected to different positions of the data line 20 . Preferably, the data driving module 31 is connected to one end of the data line 20 , and the auxiliary driving module 32 is connected to the other end of the data line 20 . Connecting the data driving module 31 and the auxiliary driving module 32 to both ends of the data line 20 is equivalent to charging and discharging the data line 20 from both ends, that is, bilateral driving. It can be known from the foregoing analysis that there is a delay in the process of transmitting the voltage on the data line 20 , and the longer the length of the data line 20 is, the longer the delay time is. For example, the end of the data line 20 connected to the data driving module 31 is defined as the proximal end, and the end connected to the auxiliary driving module 32 is defined as the remote end. In the technical solution of bilateral driving, although the far end of the data line 20 is far from the data driving module 31, it is relatively close to the auxiliary driving module 32, and the auxiliary driving module 32 can compensate for the supplementary discharge delay; and, although the data line 20 The near end of the data line 20 is closer to the data driving module 31, but farther from the auxiliary driving module 32. The charging and discharging delay of the near end of the data line 20 itself is small, and the auxiliary driving module 32 has a small compensation effect on the charging and discharging delay. Therefore, the data driving module 31 and the auxiliary driving module 32 adopt a bilateral driving manner, which can balance the charging and discharging time of the near end and the far end of the data line 20 . Compared with the charging and discharging of the data driving module 31 and the auxiliary driving module 32 from the same end, charging and discharging from both ends is beneficial to balance the charging and discharging difference between the far end and the near end of the data line 20 . Under the action of , the charging and discharging time at the far end of the data line 20 is further shortened, thereby facilitating the uniformity of the display panel.

Continuing to refer to FIG. 1 , on the basis of the above embodiments, optionally, the data driving module 31 is integrated in the data driving chip 81 ; the auxiliary driving module 32 is integrated in the auxiliary driving chip 82 . This arrangement makes the arrangement of the data driving chip 81 and the auxiliary driving chip 82 more flexible, which is favorable for arranging the data driving chip 81 and the auxiliary driving chip 82 at the required position according to the wiring method of the display panel.

Continuing to refer to FIG. 1 , preferably, the data driving chip 81 is located close to one end 21 of the data line 20 ; the auxiliary driving chip 82 is located close to the other end 22 of the data line 20 . Wherein, similar to the arrangement of the data driving chip 81 in the prior art, the data driving chip 81 provided by the embodiment of the present invention can be connected to the data line 20 through the bottom fan-out area wiring (the first connecting line 41 ). Similarly, the auxiliary driving chip 82 provided in the embodiment of the present invention may be connected to the data line 20 through the top fan-out area wiring (the second connection line 42 ). It can be seen that the length of the connection line between the data driving chip 81 and the data line 20 is short, and the length of the connection line between the auxiliary driving chip 82 and the data line 20 is short. This arrangement can reduce the charging and discharging time on the connection lines, thereby further improving the charging and discharging efficiency of the data driving chip 81 and the auxiliary driving chip 82 , which is beneficial to further improve the uniformity of the display panel. In addition, the solution of disposing the data driving chip 81 and the auxiliary driving chip 82 at both ends of the display panel does not affect the arrangement of the pixels 10 in the display area of the display panel. The arrangement of the pixels 10 can still be designed according to the prior art, and only the The border area of the panel can be improved, and the changes to the display panel are small and easy to implement.

It should be noted that, in the above embodiments, the data driving chip 81 is exemplarily shown at the bottom of the display panel, and the auxiliary driving chip 82 is at the top of the display panel, which is not a limitation of the present invention. In other embodiments, the data driving chip 81 may also be positioned at the top of the display panel, and the auxiliary driving chip 82 may be positioned at the bottom of the display panel.

FIG. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to FIG. 2 , in another embodiment of the present invention, optionally, the data driving chip 81 is connected to one end 21 of the data line 20 , and the auxiliary driving chip 82 is connected to the middle of the data line 20 . Compared with the prior art, the auxiliary driving chip 82 is connected to the middle of the data line 20 , which is equivalent to adding a charging and discharging path of the data line 20 in the middle of the data line 20 , which is beneficial to shorten the charging and discharging time of the data line 20 and relieve the data. The problem of charge-discharge delay existing in the line 20 improves the display uniformity of the display panel. Moreover, compared with the technical solution shown in FIG. 1 , the embodiment of the present invention does not need to set a fan-out area on the top of the display panel, which is beneficial to reduce the frame of the display panel.

Continuing to refer to FIG. 2 , optionally, the connection line between the auxiliary driving module 32 and the data line 20 is located between two adjacent rows of pixels 10 . Specifically, due to the large number of connection lines between the auxiliary driving module 32 and the data lines 20 , these connection lines can be distributed between the gaps of the pixels 10 in different rows.

FIG. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to FIG. 3, in another embodiment of the present invention, optionally, the auxiliary driving module 32 is respectively integrated into two auxiliary driving chips 82, and the two auxiliary driving chips 82 are respectively disposed on both sides of the display area, and set symmetrically. In this way, the auxiliary driving chip 82 located on the left provides auxiliary charging and discharging to the data line 20 located on the left, and the auxiliary driving chip 82 located on the right provides auxiliary charging and discharging to the data line 20 located on the right, which is beneficial to further shorten the connection line The length of the data line 20 can alleviate the problem of charging and discharging delay existing in the data line 20, thereby further improving the display uniformity of the display panel.

FIG. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to FIG. 4 , different from the foregoing embodiments, the data driving module 31 and the auxiliary driving module 32 are integrated in one driving chip 80 . With this arrangement, the number of driving chips 80 used can be reduced, thereby helping to reduce chip cost.

Continuing to refer to FIG. 4 , preferably, a bilateral driving scheme is adopted, and the driving chip is located at a position close to one end 21 of the data line 20 ; the data driving module 31 in the driving chip 80 is connected to one end 21 of the data line 20 through the first connecting line 41 , the auxiliary driving module 32 in the driving chip 80 is connected to the other end 22 of the data line 20 through the second connecting line 42 . Among them, the data line 20 is connected with a large number of pixels 10, so the load of the data line 20 is relatively large, and the RC Loading is relatively large. On the other hand, the first connection line 41 and the second connection line 42 only have the capacitance and resistance of the connection lines themselves, and their RC Loading is relatively small. In this embodiment, although the length of the second connection line 42 is long and there is a certain charge-discharge delay, the charge-discharge delay on the second connection line 42 is smaller than the charge-discharge delay on the data line 20 . Therefore, compared with the prior art, the embodiment of the present invention is beneficial to shorten the charging and discharging time of the data line 20, alleviate the problem of the charging and discharging delay existing in the data line 20, and thus improve the display uniformity of the display panel.

In other embodiments of the present invention, the data driving module 31 can also be set to be connected to the other end 22 of the data line 20 through the first connecting line 41 , and the auxiliary driving module 32 can be connected to the one end 21 of the data line 20 through the second connecting line 42 . . The technical principle thereof is similar to that of the technical solution shown in FIG. 4 , and will not be repeated here.

In other embodiments of the present invention, both the data driving module 31 and the auxiliary driving module 32 may be configured to be connected to the same end of the data line 20 . Specifically, the data driving module 31 is connected to one end 21 of the data line 20 through the first connection line 41 , and the auxiliary driving module 32 is connected to the same end 21 of the data line 20 through the second connection line 42 . Compared with the prior art, in the embodiment of the present invention, a charging and discharging path of the data line 20 is added at one end 21 of the data line 20 , which is beneficial to shorten the charging and discharging time of the data line 20 and alleviate the delay of charging and discharging existing in the data line 20 . Therefore, the uniformity of the display panel display can be improved. Those skilled in the art can understand that the effect of improving the display uniformity of the display panel in this embodiment is not as good as that of other embodiments of the present invention, but the wiring method of this embodiment is simple and the cost of the driving chip is low.

Based on the above implementations, optionally, the display panel is a flexible curly display panel, and the data lines 20 extend along the long sides of the display panel. Among them, compared with the conventional flexible display panel or hard screen display panel, the long-side direction of the flexible curly display panel is longer, and the voltage drop on the data line 20 is larger, therefore, the display uniformity of the flexible curly display panel is a problem. Seriously affect the quality of the display panel. Using the technical solutions of the embodiments of the present invention on the flexible curly display panel can greatly improve the display uniformity of the display panel. It can be understood that the embodiments of the present invention can also be applied to other display panels other than the flexible roll display panel.

In the above embodiments, the configuration of the data driving module 31 and the auxiliary driving module 32 provided by the embodiments of the present invention are described. In the following embodiments, the implementation schemes of the embodiments of the present invention are further described in combination with the driving principles.

FIG. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to FIG. 5 , on the basis of the above-mentioned embodiments, optionally, the data driving module 31 receives image data, converts the image data into gray-scale voltages required by each pixel 10 ; The gray scale variation of each stage is sent to the auxiliary driving module 32 . The data driving module 31 includes an image data receiving end, and the image data receiving end receives the image data through the connecting line 52 , and the image data can be provided by the main board or by the client in the point-screen test. The image data refers to the control data of the image to be displayed by the display panel in the current frame. The image data can be analyzed and processed by the data driving module 31 to determine the gray-scale voltage required by each pixel 10 . However, these gray-scale voltages cannot be transmitted to the corresponding pixels 10 at the same time. According to the control strategy of the display panel, these gray-scale voltages need to be transmitted through the data lines 20 in batches.

Exemplarily, as shown in FIG. 5 , the display panel further includes a scan circuit 70 and a scan line 60. When the scan signal on the scan line 60 controls the pixel 10 to be turned on, the data driving module 31 can pass the gray-scale voltage through the corresponding data line. 20 is transmitted to the corresponding pixel 10. However, for the same data line 20, the magnitudes of the gray-scale voltages transmitted in the two stages before and after are not the same. In the present invention, the data driving module 31 is configured to send the gray-scale variation of the two adjacent stages on the data line 20. To the auxiliary drive module 32. Exemplarily, the data driving module 31 transmits the gray scale variation to the scan driving module 32 through the connection line 51 . This arrangement provides a reliable basis for the charge and discharge amount of the auxiliary driving module 32, and the auxiliary driving module 32 charges and discharges the corresponding data line 20 according to the gray scale change amount. Therefore, the arrangement of this embodiment of the present invention is beneficial to adjust the charging and discharging functions of the auxiliary driving module 32 according to actual needs, thereby facilitating the precise control of charging and discharging on the data lines 20 and further improving the display uniformity of the display panel.

Continuing to refer to FIG. 5 , in an embodiment of the present invention, optionally, one data line 20 is connected to one column of pixels 10 ; two adjacent stages on the data line 20 are driving stages of two adjacent rows of pixels 10 . Wherein, when the data lines 20 connect the pixels 10 in the form of columns, the scan lines 60 connect the pixels 10 in the form of rows. The scan lines 60 turn on the pixels 10 row by row, and the gray-scale voltages on the data lines 20 are switched according to different requirements of the pixels 10 in each row. Specifically, in the embodiment of the present invention, the data driving module 31 receives image data, converts the image data into a grayscale voltage required by each pixel 10 , and scans the grayscale generated on the data lines 20 by two adjacent rows of pixels 10 . The change amount is sent to the auxiliary driving module 32, and the auxiliary driving module 32 charges and discharges the data line 20 according to the gray scale change amount.

Exemplarily, after receiving the image data of the client, the data driving module 31 performs a conventional screen-pointing action. When the pixel 10 in the nth row is scanned, the RAM (random access memory) in the data driving module 31 records each pixel 10 in the nth row. grayscale. When the pixel 10 in the n+1 th row is scanned, the data driving module 31 feeds back the gray scale variation ΔG corresponding to each data line 20 in the n+1 th row and the n th row to the auxiliary driving module 32 . Specifically, the data driving module 31 and the auxiliary driving module 32 are respectively located in two driving chips, the two driving chips are the data driving chip 81 and the auxiliary driving chip 82 respectively, the data driving chip 81 is provided with a feedback output terminal, and the auxiliary driving chip 82 is provided with There is a feedback input terminal, and the feedback output terminal and the feedback input terminal are connected through a connecting line 51 . The auxiliary driving module 32 receives the gray level change amount ΔG, and determines whether to charge or discharge each data line 20 by identifying the size of the gray level change amount ΔG. In the embodiment of the present invention, auxiliary charging and discharging are performed on the data lines 20 when scanning each row of pixels 10 , that is, the data lines 20 are calibrated for each pixel 10 , thereby further improving the display uniformity of the display panel.

On the basis of the foregoing embodiments, optionally, the amount of gray scale change ΔG determines the charging and discharging time of the data line 20 by the auxiliary driving module 32 . Wherein, the larger the gray-scale variation ΔG, the longer the charging and discharging time of the auxiliary driving module 32; the smaller the gray-scale variation ΔG, the shorter the charging and discharging time of the auxiliary driving module 32. Exemplarily, when the gray-scale variation ΔG is large, the difference in the gray-scale voltage on the data line 20 is relatively large, and the time required to charge and discharge the data line 20 to a desired value is relatively long. Therefore, by extending the auxiliary driving module 32 The charging and discharging time of the data line 20 is helpful for the data line 20 to accurately reach the desired value, thereby improving the accuracy of charging and discharging, and further improving the display uniformity of the display panel. When the gray scale change amount ΔG is small, the technical principle is similar, and details are not repeated here.

On the basis of the above embodiment, optionally, the charging voltage of the auxiliary driving module 32 is set to be the same, and the discharging voltage is the same. In this way, there is no need to set different charging and discharging voltages according to different gray scale changes ΔG, which is beneficial to simplify the structural design of the auxiliary driving module 32 and reduce the cost.

FIG. 6 is a schematic structural diagram of an auxiliary driving module according to an embodiment of the present invention. Referring to FIG. 6 , optionally, the auxiliary drive module 32 includes a first switch unit 321 , a second switch unit 322 and a control unit 323 ; the first switch unit 321 uses the first voltage for charging under the control of the control unit 323 Under the control of the control unit 323, the second switch unit 322 outputs the second voltage V2 for discharging; and the control unit 323 controls the voltage of the first switch unit 321 or the second switch unit 322 according to the gray scale change ΔG turn-on time. The first switch unit 321 and the second switch unit 322 may be transistors, for example, and the control unit 323 may be a microprocessor. The configuration of the embodiment of the present invention makes the structure of the auxiliary drive module 32 simple and easy to implement.

In the above embodiments, whether the auxiliary driving module 32 should charge or discharge the data line 20 is related to the corresponding relationship between the grayscale voltage of the pixel 10 and the grayscale. The gray scale refers to the luminous brightness of the pixel 10. For example, the gray scale range is 0-255 gray scale. The larger the gray scale value is, the brighter the pixel 10 is, and the smaller the gray scale value is, the darker the pixel 10 is. The concept of gray scale voltage is different from that of gray scale. The gray scale voltage refers to the voltage that the data line 20 needs to reach in order to make the pixel 10 realize its gray scale. When the gray scale is determined, the size of the gray scale voltage is set differently according to different situations. .

In one embodiment, optionally, the grayscale voltage of the pixel 10 has a negative correlation with its grayscale, that is, the larger the grayscale, the smaller the grayscale voltage on the data line 20; the smaller the grayscale, the smaller the data line 20 The higher the gray-scale voltage is. When the gray-scale variation is greater than the threshold, the auxiliary driving module 32 discharges the data line 20 ; when the gray-scale variation is smaller than the threshold, the auxiliary driving module 32 charges the data line 20 . Among them, the critical value can be set to 0. Exemplarily, when the gray scale change amount ΔG>0, the data line 20 is discharged, the control unit 323 controls the second switch unit 322 to be turned on, and the second voltage V2 is used to discharge the data line 20; when the gray scale change amount When ΔG<0, the data line 20 is charged, the control unit 323 controls the first switch unit 321 to be turned on, and the first voltage V1 is used to charge the data line 20 . Wherein, the first voltage V1 is greater than 0, and the value is relatively large, such as 10V, 14V, etc., to quickly charge the auxiliary data line 20; the second voltage V2 is less than 0, and the value is relatively small, such as -10V, -14V, etc., Rapid discharge with auxiliary data line 20 .

In the above-mentioned embodiments, the correlation between the grayscale voltage of the pixel 10 and the grayscale is determined by the circuit of the pixel 10 , mainly by the type of the driving transistor in the pixel circuit. The following takes the more commonly used 7T1C pixel circuit as an example for description.

FIG. 7 is a schematic circuit diagram of a pixel according to an embodiment of the present invention. Referring to FIG. 7, in an embodiment of the present invention, optionally, the pixel 10 includes a pixel circuit 11 and a light-emitting device 12, and the pixel circuit 11 includes: a driving transistor M11, a data writing transistor M12, a compensation transistor M13, a first The initialization transistor M14, the first light emission control transistor M15, the second light emission control transistor M16, the second initialization transistor M17, and the storage capacitor Cst1.

The gate of the data writing transistor M12 is electrically connected to the second scan line 62, connected to the second scan signal S2, the first pole of the data writing transistor M12 is electrically connected to the data line 20, connected to the data voltage DATA, and the data is written The second electrode of the transistor M12 is electrically connected to the first electrode of the driving transistor M11.

The gate of the compensation transistor M13 is electrically connected to the second scan line 62 , the first electrode of the compensation transistor M13 is electrically connected to the second electrode of the driving transistor M11 , and the second electrode of the compensation transistor M13 is electrically connected to the gate of the driving transistor M11 . Optionally, the compensation transistor M13 is a dual-gate transistor, which is beneficial to suppress the leakage of the gate of the driving transistor M11.

The gate of the first initialization transistor M14 is electrically connected to the first scan line 61, connected to the first scan signal S1, and the first electrode of the first initialization transistor M14 is electrically connected to the reference voltage signal line 81, connected to the initialization signal Vref, and the first electrode of the first initialization transistor M14 is electrically connected to the reference voltage signal line 81. The second electrode of an initialization transistor M14 is electrically connected to the gate of the driving transistor M11. Optionally, the first initialization transistor M14 is a dual-gate transistor, which is beneficial to suppress the leakage of the gate of the driving transistor M11.

The gate of the first light-emitting control transistor M15 is electrically connected to the light-emitting control signal line 63 and connected to the light-emitting control signal ME, and the first pole of the first light-emitting control transistor M15 is electrically connected to the second power supply signal line 82 and connected to the second power supply With the signal ELVDD, the second electrode of the first light emission control transistor M15 is electrically connected to the first electrode of the driving transistor M11.

The gate of the second light-emitting control transistor M16 is electrically connected to the light-emitting control signal line 63, the first electrode of the second light-emitting control transistor M16 is electrically connected to the second electrode of the driving transistor M11, and the second electrode of the second light-emitting control transistor M16 is electrically connected to the second electrode of the driving transistor M11. The anode of the light emitting device 12 is electrically connected.

The gate of the second initialization transistor M17 is electrically connected to the first scan line 61 , the first electrode of the second initialization transistor M17 is electrically connected to the initialization signal line 81 , and the second electrode of the second initialization transistor M17 is electrically connected to the anode of the light emitting device 12 connect. The cathode of the light emitting device 12 is electrically connected to the first power signal line 83 and connected to the first power signal ELVSS.

The first end of the storage capacitor Cst1 is electrically connected to the second power signal line 82, and the second end of the storage capacitor Cst1 is electrically connected to the gate of the driving transistor M11.

The gray-scale voltage on the data line 20 is finally transmitted to the gate of the driving transistor M11. In the pixel circuit 11, each transistor including the driving transistor M11 is a P-type transistor. For the P-type driving transistor M11 , the lower the gate voltage thereof, the larger the driving current generated, and the higher the luminous brightness of the light-emitting device 12 , that is, the larger the gray scale. Therefore, for the P-type driving transistor M11, the grayscale voltage of the pixel 10 has a negative correlation with the grayscale.

FIG. 8 is a schematic diagram of a driving timing sequence of a pixel according to an embodiment of the present invention. 7 and 8, the driving timing of the pixel circuit 11 includes: an initialization phase t1, a data writing phase t2, and a light-emitting phase t3.

In the initialization phase t1, the light emission control signal EM is at a high level, the first scan signal S1 is at a low level, and the second scan signal S2 is at a high level. The first initialization transistor M14 is turned on in response to the low level of the first scan signal S1, and the initialization signal Vref is written into the gate of the driving transistor M11 to ensure that the driving transistor M11 is turned on at the initial moment of the next stage.

In the data writing phase t2, the light emission control signal EM is at a high level, the first scan signal S1 is at a high level, and the second scan signal S2 is at a low level. The data writing transistor M12 and the compensation transistor M13 are turned on in response to the low level of the second scan signal S2, and write the data voltage DATA to the gate of the driving transistor M11.

In the light-emitting stage t3, the light-emitting control signal EM is at a low level, the first scan signal S1 is at a high level, and the second scan signal S2 is at a high level. The first light-emitting control transistor M15 and the second light-emitting control transistor M16 are turned on in response to the low level of the light-emitting control signal EM, and the driving transistor M11 generates a driving current in response to the voltage of its gate to drive the light-emitting device 12 to emit light.

It can be seen from the above driving process that in the data writing stage t2, the gray-scale voltage on the data line 20 needs to be written into the gate of the driving transistor M11. Therefore, the charging and discharging of the data line 20 needs to be completed in the data writing stage t2. Optionally, the data writing phase t2 includes an auxiliary charging and discharging phase t21 and a self-charging and discharging phase t22. In the auxiliary charging and discharging stage t21, the data driving module 31 provides the data voltage DATA, the auxiliary driving module 32 provides the auxiliary voltage ΔDATA, the data driving module 31 and the auxiliary driving module 32 charge and discharge the data line 20 at the same time, which can speed up the charging and discharging of the data line 20. The charging and discharging speed is improved, and the problem of long charging and discharging time of the data line 20 is improved. The auxiliary charging and discharging stage t21 is equivalent to the stage of initializing the charging and discharging of the data line 20 , and the initialization process is the initialization toward the desired direction of the data line 20 . In the self-charging and discharging stage t22 , only the data driving module 31 charges and discharges the data line 20 , so as to avoid the problem that the output voltage of the auxiliary driving module 32 is not equal to the gray-scale voltage of the data line 20 .

The duration of the auxiliary charging and discharging phase t21 is adjusted according to the gray scale change ΔG, and the self-charging and discharging phase t22 can also be adjusted according to the duration of the auxiliary charging and discharging phase t21. Exemplarily, the auxiliary charging and discharging electronic phase t21 is relatively long, and the self-charging and discharging electronic phase t22 is correspondingly short; the auxiliary charging and discharging electronic phase t21 is relatively short, and the self-charging and discharging electronic phase t22 is correspondingly relatively long. In the embodiment of the present invention, the data writing stage t2 includes an auxiliary charging and discharging stage t21 and a self-charging and discharging stage t22, which is not only conducive to fast charging and discharging of the data line 20, but also ensures accurate gray-scale voltage on the data line 20.

In the above embodiments, the charging and discharging time of the auxiliary driving module 32 can be set as required. Specifically, the charging and discharging time can be determined according to experimental tests. As shown in Table 1, taking the driving transistor M11 as a P-type transistor as an example, the gray scale change amount ΔG is divided into 8 ranges, which are 255-192, 191-128, 127-64, 63-32, -63- -32, -127～-64, -191～-128, -255～-192. When the gray scale variation ΔG>32, it indicates that the gray scale voltage of the next row is greater than the gray scale voltage of the previous row, and the data line 20 needs to be discharged; when the gray scale variation ΔG<-32, it indicates that the gray scale voltage of the next row is The voltage is lower than the gray-scale voltage of the previous row, and the data line 20 is charged. Among them, when the gray-scale change amount ΔG is between -31 and 31, the gray-scale change amount is small, and there is no need to perform charging and discharging.

Table 1

FIG. 9 is a schematic circuit diagram of another pixel according to an embodiment of the present invention. Referring to FIG. 9 , different from the embodiment shown in FIG. 7 , each transistor including the driving transistor M11 is an N-type transistor. Accordingly, the structure of the pixel circuit 11 is adaptively adjusted, and the driving timing also needs to be adaptively adjusted. Specifically, the second pole of the data writing transistor M12 is electrically connected to the second pole of the driving transistor M11, the first pole of the compensation transistor M13 is electrically connected to the first pole of the driving transistor M11, and the storage capacitor Cst1 is connected to the first pole of the driving transistor M11. between the gate and the anode of the first light emitting device 12 . The signal for initializing the anode of the first light-emitting device 12 and the signal for initializing the gate of the driving transistor M11 cannot be shared and need to be set separately, wherein the signal for initializing the driving transistor M11 is the first initialization signal Vref1 (high voltage). level), the signal for initializing the anode of the first light emitting device 12 is the second initialization signal Vref2 (low level).

Correspondingly, the grayscale voltage of the pixel 10 is positively correlated with its grayscale. When the grayscale variation ΔG is less than the critical value, the auxiliary driving module 32 discharges the data line 20; when the grayscale variation ΔG is greater than the critical value, the auxiliary driving module 32 discharges the data line 20. The driving module 32 discharges the data line 20 . The specific implementation manner is similar to that of the foregoing embodiment, and details are not repeated here.

In the above-mentioned embodiments, the charging and discharging time of the data line 20 by the auxiliary driving module 32 is determined by the gray scale change amount ΔG, which is not a limitation of the present invention. In another embodiment of the present invention, optionally, the gray-scale variation ΔG determines the charging and discharging voltage of the auxiliary driving module 32 to the data line 20; The greater the difference between the charging and discharging voltage and the gray-scale voltage output by the data driving module 31; the smaller the gray-scale variation ΔG, the smaller the difference between the charging and discharging voltage output by the auxiliary driving module 32 and the gray-scale voltage output by the driving module. . The technical principle thereof is similar to that of the foregoing embodiments, and will not be repeated here.

It should be noted that, in the above-mentioned embodiments, the gray-scale change amount charge-discharge index is exemplified as an example for description, which is not intended to limit the present invention. In other embodiments, the change amount of the gray-scale voltage may also be used as the charge and discharge index. Different from the gray-scale variation as the charging and discharging standard, it is more direct to use the gray-scale voltage variation. When the gray-scale voltage variation is less than the critical value, the auxiliary drive module discharges the data line; when the gray-scale voltage variation is greater than When the critical value is reached, the auxiliary driving module discharges the data lines.

FIG. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to FIG. 10 , on the basis of the above embodiments, optionally, the display panel further includes a power signal line 54 , and the power signal line 50 provides power to the data driving module 31 and the auxiliary driving module 32 .

Optionally, the display panel further includes a synchronization signal line 54, and the synchronization signal line 54 is connected to the data driving module 31 and the auxiliary driving module 32, and is used to ensure the data synchronization of the data driving module 31 and the auxiliary driving module 32, thereby ensuring that the data line 20 is synchronized. the accuracy of the auxiliary drive.

It should also be noted that, in the prior art, display panels are classified into display panels in a narrow sense and display panels in a broad sense. The display panel in the narrow sense only includes the pixel 10 , the scanning circuit 70 fabricated in the same process as the pixel 10 , and various signal lines, etc., and does not include the driving chip. In addition to a narrow display panel, a broad display panel may also include a driver chip, a flexible circuit board, and the like. In some embodiments, a display panel in a broad sense can also be called a display module. A display module includes not only a display panel in a narrow sense, but also structures such as driver chips, flexible circuit boards, buffer foam, polarizers, and cover glass. . The display panel involved in the embodiments of the present invention is a generalized display panel.

An embodiment of the present invention also provides a method for driving a display panel. It is applicable to the display panel provided by any embodiment of the present invention. Specifically, the driving method of the display panel includes: when driving the pixels, the data driving module provides the data lines with gray-scale voltages required by the pixels; the auxiliary driving module provides auxiliary charging and discharging voltages to the data lines to assist the data lines for charging and discharging.

In each embodiment of the pixel circuit, specific descriptions of driving methods are given for different pixel circuits, and these driving methods can be regarded as the driving methods of the pixel circuit provided by the embodiments of the present invention, and the repeated content will not be repeated here.

Embodiments of the present invention also provide a display device. The display device may be a mobile phone, a computer, a tablet computer, a wearable device, and the like. The display device includes the display panel provided by any embodiment of the present invention, and the technical principles and the effects are similar, and details are not repeated here.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

1. A display panel, characterized in that, comprising: Multiple pixels arranged in a preset pattern; a plurality of data lines, the data lines extend from one end of the display panel to the other end of the display panel; one of the data lines is electrically connected to some of the pixels; the voltage on the data lines determines the pixels luminous brightness; a data driving module, which is electrically connected to the plurality of data lines; the data driving module is used for providing the data lines with gray-scale voltages required by the pixels; The auxiliary driving module is electrically connected to the plurality of data lines; the auxiliary driving module is used for providing auxiliary charging and discharging voltages to the data lines, so as to assist the data lines to perform charging and discharging. 2. The display panel according to claim 1, wherein the data driving module and the auxiliary driving module are respectively connected to different positions of the data lines; Preferably, the data driving module is connected to one end of the data line, and the auxiliary driving module is connected to the other end of the data line. 3. The display panel according to claim 1 or 2, wherein the data driving module is integrated in a data driving chip; the auxiliary driving module is integrated in an auxiliary driving chip; Preferably, the data driving chip is located close to one end of the data line; the auxiliary driving chip is located close to the other end of the data line. 4. The display panel according to claim 1 or 2, wherein the display panel is a flexible curly display panel, and the data lines extend along a long side of the display panel. 5 . The display panel according to claim 1 , wherein the data driving module receives image data, converts the image data into a gray-scale voltage required by each pixel; and connects the data line Sending the gray-scale variation or the gray-scale voltage variation of the last two adjacent stages to the auxiliary driving module; The auxiliary driving module charges and discharges the corresponding data lines according to the gray-scale variation or the gray-scale voltage variation; Preferably, one data line is connected to a column of the pixels; two adjacent stages on the data line are driving stages of the pixels in two adjacent rows. 6 . The display panel according to claim 5 , wherein the amount of change in gray level or the amount of change in gray level voltage determines the charging and discharging time of the auxiliary driving module for the data line; 6 . Wherein, the larger the gray-scale variation or the gray-scale voltage variation, the longer the charging and discharging time of the auxiliary drive module; the smaller the gray-scale variation or the gray-scale voltage variation, the longer the auxiliary driving module The shorter the charging and discharging time; Preferably, the auxiliary drive module includes a first switch unit, a second switch unit and a control unit; the first switch unit outputs a first voltage for charging under the control of the control unit; the first switch unit outputs a first voltage for charging; Under the control of the control unit, the two switch units output a second voltage for discharging; and the control unit controls the first switch unit or the The turn-on time of the second switch unit. 7 . The display panel according to claim 5 , wherein the amount of change in gray level or the amount of change in gray level voltage determines the charging and discharging voltage of the auxiliary driving module to the data line; 8 . The greater the gray-scale variation or the gray-scale voltage variation, the greater the difference between the charge-discharge voltage output by the auxiliary driving module and the gray-scale voltage output by the data driving module; the gray-scale variation or the gray-scale voltage The smaller the variation, the smaller the difference between the charge-discharge voltage output by the auxiliary driving module and the gray-scale voltage output by the driving module. 8 . The display panel according to claim 5 , wherein if the gray-scale voltage of the pixel is negatively correlated with its gray-scale, when the gray-scale variation is greater than a critical value, the auxiliary driving module discharging the data line; when the gray-scale variation is less than a critical value, the auxiliary driving module charges the data line; If the gray-scale voltage of the pixel has a positive correlation with its gray-scale, the auxiliary driving module discharges the data line when the gray-scale variation is less than a threshold; and when the gray-scale variation is greater than a threshold value, the auxiliary driving module discharges the data line. 9. A method for driving a display panel according to any one of claims 1-8, characterized in that, comprising: When driving a pixel, the data driving module provides the data line with a gray-scale voltage required by the pixel; the auxiliary driving module provides an auxiliary charging and discharging voltage to the data line to assist the data line in charging discharge. 10. A display device, comprising the display panel according to any one of claims 1-8.

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