Display panel, driving method thereof, and display device

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 pattern; a plurality of data lines extending from one end of the display panel to the other end of the display panel; one of the data lines being electrically connected to some of the pixels; the voltage on the data line determining the emission brightness of the pixels; a data driving module electrically connected to the plurality of data lines; the data driving module being configured to provide gray-scale voltages required by the pixels to the data lines; an auxiliary driving module electrically connected to the plurality of data lines; the auxiliary driving module being configured to provide auxiliary charge and discharge voltages to the data lines to assist the data lines in charge and discharge. Compared with the prior art, the embodiments of the present invention improve the problem of display uniformity caused by charge and discharge delay of gray-scale voltages.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technologies, and in particular, to a display panel, a driving method thereof, and a display device. Background Art

[0002] With the continuous development of display technologies, people have higher and higher requirements for display panels. Among them, the diversification of the form of display panels and high display quality have always been the goals pursued by major panel manufacturers.

[0003] In the prior art, the product types of display panels are becoming increasingly rich. Taking flexible curling products as an example, their greatest advantage is that they can be freely curled and stretched, and can save usage space when not in use. However, due to the long length in the long side direction of flexible curling products, the voltage drop (RC Loading) of data lines is too large, resulting in charge and discharge delays of gray-scale voltages, which affects the uniformity of display of the display panel. Summary of the Invention

[0004] Embodiments of the present invention provide a display panel, a driving method thereof, and a display device to improve the problem of display uniformity caused by charge and discharge delays of gray-scale voltages.

[0005] To achieve the above technical objectives, embodiments of the present invention provide the following technical solutions:

[0006] A display panel includes:

[0007] A plurality of pixels arranged in a preset pattern;

[0008] A plurality of data lines extending from one end of the display panel to the other end; one of the data lines is electrically connected to some of the pixels; the voltage on the data line determines the emission brightness of the pixel;

[0009] A data driving module electrically connected to the plurality of data lines; the data driving module is used to provide the gray-scale voltages required by the pixels to the data lines;

[0010] An auxiliary driving module electrically connected to the plurality of data lines; the auxiliary driving module is used to provide auxiliary charge and discharge voltages to the data lines to assist the data lines in charging and discharging.

[0011] Optionally, the data driving module and the auxiliary driving module are respectively connected to different positions of the data line;

[0012] 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.

[0013] Optionally, the data driving module is integrated in a data driving chip; the auxiliary driving module is integrated in an auxiliary driving chip;

[0014] Preferably, the data driving chip is located at a position close to one end of the data line; the auxiliary driving chip is located at a position close to the other end of the data line.

[0015] Optionally, the display panel is a flexible and rollable display panel, and the data line extends along the long side of the display panel.

[0016] Optionally, the data driving module receives image data, converts the image data into grayscale voltages required for each pixel; and sends the grayscale change amount or grayscale voltage change amount between two adjacent stages on the data line to the auxiliary driving module;

[0017] The auxiliary driving module charges and discharges the corresponding data line according to the grayscale change amount or grayscale voltage change amount;

[0018] Preferably, one data line is connected to one column of the pixels; two adjacent stages on the data line are driving stages of two adjacent rows of the pixels.

[0019] Optionally, the grayscale change amount or grayscale voltage change amount determines the charging and discharging time of the auxiliary driving module for the data line;

[0020] Wherein, the larger the grayscale change amount or grayscale voltage change amount is, the longer the charging and discharging time of the auxiliary driving module is; the smaller the grayscale change amount or grayscale voltage change amount is, the shorter the charging and discharging time of the auxiliary driving module is;

[0021] Preferably, the auxiliary driving 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 second switch unit outputs a second voltage for discharging under the control of the control unit; and the control unit controls the conduction time of the first switch unit or the second switch unit according to the grayscale change amount or grayscale voltage change amount.

[0022] Optionally, the grayscale change amount or grayscale voltage change amount determines the charging and discharging voltage of the auxiliary driving module for the data line;

[0023] The larger the grayscale change amount or grayscale voltage change amount is, the larger the difference between the charging and discharging voltage output by the auxiliary driving module and the grayscale voltage output by the data driving module is; the smaller the grayscale change amount or grayscale voltage change amount is, the smaller the difference between the charging and discharging voltage output by the auxiliary driving module and the grayscale voltage output by the driving module is.

[0024] Optionally, if the gray-scale voltage of the pixel is negatively correlated with its gray scale, when the change amount of the gray scale is greater than the critical value, the auxiliary driving module discharges the data line; when the change amount of the gray scale is less than the critical value, the auxiliary driving module charges the data line;

[0025] If the gray-scale voltage of the pixel is positively correlated with its gray scale, when the change amount of the gray scale is less than the critical value, the auxiliary driving module discharges the data line; when the change amount of the gray scale is greater than the critical value, the auxiliary driving module discharges the data line.

[0026] Correspondingly, the present invention further provides a driving method for a display panel as described in any embodiment of the present invention, including:

[0027] When driving a pixel, the data driving module provides the gray-scale voltage required by the pixel to the data line; the auxiliary driving module provides an auxiliary charge-discharge voltage to the data line to assist the data line in charging and discharging.

[0028] Correspondingly, the present invention further provides a display device, including the display panel as described in any embodiment of the present invention.

[0029] In the embodiment of the present invention, an auxiliary driving module is added to the display panel. The auxiliary driving module is electrically connected to the data line and is used to provide an auxiliary charge-discharge voltage to the data line to assist the data line in charging and discharging. Compared with the prior art, the embodiment of the present invention adds a charge-discharge path for the data line, which is beneficial to shortening the charge-discharge time of the data line and alleviating the problem of charge-discharge delay existing in the data line, thereby improving the uniformity of the display of the display panel. Especially for a display panel with a longer long side direction, since its uniformity problem is more serious, the improvement effect of the embodiment of the present invention is more obvious. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0031] Figure 2 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0032] Figure 3 It is a schematic structural diagram of yet another display panel provided by an embodiment of the present invention;

[0033] Figure 4 It is a schematic structural diagram of yet another display panel provided by an embodiment of the present invention;

[0034] Figure 5 It is a schematic structural diagram of yet another display panel provided by an embodiment of the present invention;

[0035] Figure 6 Structural schematic diagram of an auxiliary driving module provided by an embodiment of the present invention;

[0036] Figure 7 Circuit schematic diagram of a pixel provided by an embodiment of the present invention;

[0037] Figure 8 Driving timing schematic diagram of a pixel provided by an embodiment of the present invention;

[0038] Figure 9 Another circuit schematic diagram of a pixel provided by an embodiment of the present invention;

[0039] Figure 10 Structural schematic diagram of another display panel provided by an embodiment of the present invention. Detailed implementation manners

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0041] As described in the background art, when the existing display panel is relatively long in the long side direction, there is a charge and discharge delay in the data lines, which affects the uniformity of the display of the display panel. After research by the inventor, it is found that the charging time of the data lines can be shortened by performing auxiliary charge and discharge on the data lines to make up for the charge and discharge delay existing in the data lines. Among them, the realization of the auxiliary charge and discharge function for the data lines is executed by the auxiliary driving module. The specific description is as follows:

[0042] Figure 1 Structural schematic diagram of a display panel provided by an embodiment of the present invention. Refer to Figure 1 , the display panel includes: a plurality of pixels 10 arranged in a preset pattern, a plurality of data lines 20, a data driving module 31, and an auxiliary driving module 32.

[0043] Among them, since the embodiments of the present invention are applicable to display panels with any arrangement pattern, the preset arrangement pattern of the pixels 10 can be any pixel arrangement pattern. The preset pixel arrangement pattern can be, for example: standard RGB arrangement, RGB PenTile arrangement, RGB Delta arrangement, RGBW arrangement, RGB S-Strip arrangement, etc.

[0044] The data line 20 extends from one end of the display panel to the other end. Exemplarily, the data line 20 extends along the long side or the short side of the display panel. Due to the existence of RC loading, the longer the data line 20 extends, the more serious the charge and discharge delay at the far end. Therefore, regardless of whether the data line 20 extends along the long side or the short side, there will be a problem of charge and discharge delay at the far end, and the longer the data line 20 is, the more serious the problem of charge and discharge delay will be. Those skilled in the art can understand that the embodiments of the present invention can improve both the uniformity problem existing when the data line 20 extends along the long side and the uniformity problem existing when the data line 20 extends along the short side.

[0045] A data line 20 is electrically connected to some pixels 10, and the voltage on the data line 20 determines the emission brightness of the pixels 10. Exemplarily, a data line 20 is electrically connected to a column of pixels 10 in the display panel. Within one frame, the data line 20 sequentially provides grayscale voltages to each pixel 10 so that the pixel 10 emits light with a preset grayscale brightness. Since the brightness of all the pixels 10 in this column of pixels 10 is not the same, the grayscale 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 grayscale voltage. However, there is a delay during the charge and discharge process of the data line 20. If the technical solution provided by the embodiments of the present invention is not adopted, the problem caused thereby is that before the charge and discharge of the data line 20 is completely transmitted to the far end, the data line 20 has already started to drive the pixels 10. That is to say, before the voltage at the far end of the data line 20 reaches the preset grayscale voltage, the data line 20 has already started to drive the pixels 10, resulting in a deviation in the grayscale voltage for driving the pixels 10 to light up, causing a problem of poor display uniformity of the display panel.

[0046] The data driving module 31 is electrically connected to multiple data lines 20; the data driving module 31 is used to provide the grayscale voltage required by the pixels 10 to the data lines 20. Exemplarily, the main board transmits image data to the data driving module 31, and the data driving module 31 converts the image data into the grayscale voltage required by each pixel 10; and transmits the grayscale voltage to the corresponding data line 20.

[0047] The auxiliary driving module 32 is electrically connected to a plurality of data lines 20; the auxiliary driving module 32 is configured to provide an auxiliary charge-discharge voltage to the data lines 20 to assist the data lines 20 in charging and discharging. Among them, the function of the auxiliary driving module 32 is different from that of the data driving module 31. As a supplementary module or subordinate module of the data driving module 31, it is used to perform auxiliary charge-discharge on the data lines 20 to shorten the charge-discharge time of the data lines 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 to enable the data line 20 to discharge quickly. After charging for a preset time, the negative voltage is removed, and the data driving module 31 still provides the grayscale voltage to ensure the accuracy of the grayscale 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 enable the data line 20 to charge quickly. After charging for a preset time, the positive voltage is removed, and the data driving module 31 still provides the grayscale voltage to ensure the accuracy of the grayscale voltage on the data line 20.

[0048] In summary, 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 lines 20 and is configured to provide an auxiliary charge-discharge voltage to the data lines 20 to assist the data lines 20 in charging and discharging. Compared with the prior art, the embodiment of the present invention adds a charge-discharge path for the data lines 20, which is beneficial to shortening the charge-discharge time of the data lines 20, alleviating the problem of charge-discharge delay existing in the data lines 20, and thus improving the uniformity of the display of the display panel. Especially for a display panel with a longer long side direction, since its uniformity problem is more serious, the improvement effect of the embodiment of the present invention is more obvious.

[0049] Continue to refer to Figure 1, based on the above 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. As can be seen from the foregoing analysis, there is a delay in the process of the data line 20 transmitting voltage, and the longer the length of the data line 20, the longer the delay time. For example, define the end of the data line 20 connected to the data driving module 31 as the proximal end, and the end connected to the auxiliary driving module 32 as the distal end. In the technical solution of bilateral driving, although the distal end of the data line 20 is far from the data driving module 31, it is close to the auxiliary driving module 32, and the auxiliary driving module 32 can compensate for the charging and discharging delay; and, although the proximal end of the data line 20 is close to the data driving module 31, it is far from the auxiliary driving module 32, and the charging and discharging delay of the proximal end of the data line 20 itself is small, and the compensation effect of the auxiliary driving module 32 on its charging and discharging delay is also small. Therefore, the data driving module 31 and the auxiliary driving module 32 adopt the bilateral driving method, which can balance the charging and discharging times of the proximal end and the distal end of the data line 20. Compared with the data driving module 31 and the auxiliary driving module 32 charging and discharging from the same end, charging and discharging from both ends is beneficial to balance the charging and discharging differences between the distal end and the proximal end of the data line 20. Under the action of the auxiliary driving module 32 on the distal end, the charging and discharging time of the distal end of the data line 20 is further shortened, which is beneficial to the uniformity of the display panel.

[0050] Continue to refer to Figure 1 , based on 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. Such a setting makes the setting method of the data driving chip 81 and the auxiliary driving chip 82 more flexible, which is beneficial to setting the data driving chip 81 and the auxiliary driving chip 82 at the required positions according to the wiring method of the display panel.

[0051] Continue to refer to Figure 1, Preferably, the data driving chip 81 is located at a position near one end 21 of the data line 20; the auxiliary driving chip 82 is located at a position near the other end 22 of the data line 20. Among them, similar to the setting method of the data driving chip 81 in the prior art, the data driving chip 81 provided in the embodiment of the present invention can be connected to the data line 20 through the fan-out zone routing at the bottom (the first connection line 41). Similarly, the auxiliary driving chip 82 provided in the embodiment of the present invention can be connected to the data line 20 through the fan-out zone routing at the top (the second connection line 42). Thus, 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. Such a setting can reduce the charge and discharge time on the connection line, thereby further improving the charge and discharge efficiency of the data driving chip 81 and the auxiliary driving chip 82, which is beneficial to further improving the uniformity problem of the display panel. In addition, the scheme of separating 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 border area of the display panel needs to be improved, with less modification to the display panel and being easy to implement.

[0052] It should be noted that in the above embodiments, it is exemplarily shown that the data driving chip 81 is located at the bottom end of the display panel and the auxiliary driving chip 82 is located at the top end of the display panel, which is not a limitation to the present invention. In other embodiments, it is also possible to set the data driving chip 81 at the top end of the display panel and the auxiliary driving chip 82 at the bottom end of the display panel.

[0053] Figure 2 It is a schematic structural diagram of another display panel provided by the embodiment of the present invention. Refer to Figure 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, connecting the auxiliary driving chip 82 to the middle of the data line 20 is equivalent to adding a charge and discharge path for the data line 20 in the middle of the data line 20, which is beneficial to shortening the charge and discharge time of the data line 20 and alleviating the problem of charge and discharge delay existing in the data line 20, thereby improving the uniformity of the display of the display panel. And compared with Figure 1 the technical solution shown, the embodiment of the present invention does not need to set a fan-out zone at the top of the display panel, which is beneficial to reducing the border of the display panel.

[0054] Continue to refer to Figure 2 , optionally, the connection line between the auxiliary driving module 32 and the data line 20 is located between adjacent rows of pixels 10. Specifically, since the number of connection lines between the auxiliary driving module 32 and the data line 20 is large, these connection lines can be dispersed into the gaps between different rows of pixels 10.

[0055] Figure 3 This is a schematic structural diagram of another display panel provided by an embodiment of the present invention. Refer to Figure 3 , in another embodiment of the present invention, optionally, the auxiliary driving modules 32 are respectively integrated in two auxiliary driving chips 82, and these two auxiliary driving chips 82 are respectively arranged on both sides of the display area and symmetrically arranged. In this way, the auxiliary driving chip 82 on the left side provides auxiliary charge and discharge for the data lines 20 on the left side, and the auxiliary driving chip 82 on the right side provides auxiliary charge and discharge for the data lines 20 on the right side, which is beneficial to further shorten the length of the connection lines and alleviate the problem of charge and discharge delay existing in the data lines 20, thereby further improving the uniformity of the display of the display panel.

[0056] Figure 4 This is a schematic structural diagram of another display panel provided by an embodiment of the present invention. Refer to Figure 4 , different from the foregoing embodiments, the data driving module 31 and the auxiliary driving module 32 are integrated in a driving chip 80. Such a setting can reduce the number of driving chips 80 used, thereby being beneficial to reducing the chip cost.

[0057] Continue to refer to Figure 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 a first connection line 41, and the auxiliary driving module 32 in the driving chip 80 is connected to the other end 22 of the data line 20 through a second connection line 42. Among them, a large number of pixels 10 are connected to the data line 20, so the load of the data line 20 is large and the RC Loading is large. While 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 small. In this embodiment, although the length of the second connection line 42 is long and there is a certain charge and discharge delay, compared with the charge and discharge delay on the data line 20, the charge and discharge delay on the second connection line 42 is small. Therefore, compared with the prior art, the embodiment of the present invention is beneficial to shortening the charge and discharge time of the data line 20 and alleviating the problem of charge and discharge delay existing in the data line 20, thereby improving the uniformity of the display of the display panel.

[0058] In other embodiments of the present invention, it is also possible to set that the data driving module 31 is connected to the other end 22 of the data line 20 through the first connection line 41, and the auxiliary driving module 32 is connected to one end 21 of the data line 20 through the second connection line 42. The technical principle is similar to the Figure 4 shown technical solution and will not be elaborated here.

[0059] In other embodiments of the present invention, the data driving module 31 and the auxiliary driving module 32 may also 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, the embodiment of the present invention adds a charging and discharging path of the data line 20 at one end 21 of the data line 20, which is beneficial to shortening the charging and discharging time of the data line 20 and alleviating the problem of charging and discharging delay existing in the data line 20, thereby improving the uniformity of the display of the display panel. Those skilled in the art can understand that the improvement effect of this embodiment on the display uniformity of the display panel 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.

[0060] On the basis of the above embodiments, optionally, the display panel is a flexible curved display panel, and the data line 20 extends along the long side of the display panel. Among them, compared with a conventional flexible display panel or a hard screen display panel, the long side direction of the flexible curved display panel is longer, and the voltage drop on the data line 20 is larger. Therefore, the problem of display uniformity of the flexible curved display panel seriously affects the quality of the display panel. Adopting the technical solution of the embodiment of the present invention on the flexible curved display panel can greatly improve the display uniformity of the display panel. It can be understood that the embodiment of the present invention can also be applied to other display panels other than the flexible curved display panel.

[0061] In the above embodiments, the setting methods 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 solutions of the embodiments of the present invention are further described in combination with the driving principle.

[0062] Figure 5 It is a schematic structural diagram of another display panel provided by the embodiment of the present invention. Refer to Figure 5 , on the basis of the above embodiments, optionally, the data driving module 31 receives image data, converts the image data into the gray-scale voltage required for each pixel 10; and sends the gray-scale change amount between two adjacent stages on the data line 20 to the auxiliary driving module 32. Among them, the data driving module 31 includes an image data receiving end, and the image data receiving end receives image data through the connection line 52. The image data can be provided by the main board or provided by the client during the dot-matrix test. The image data refers to the control data of the image that the display panel needs to display in the current frame. Under the analysis and processing of the data driving module 31, the gray-scale voltage required for each pixel 10 can be determined. 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 in batches through the data line 20.

[0063] Exemplarily, as Figure 5 shown, the display panel further includes a scanning circuit 70 and scanning lines 60. Only when the scanning signal on the scanning line 60 controls the pixel 10 to turn on, can the data driving module 31 transmit the grayscale voltage to the corresponding pixel 10 through the corresponding data line 20. However, for the same data line 20, the magnitudes of the grayscale voltages transmitted in the previous and subsequent stages are not the same. The present invention sets the data driving module 31 to send the grayscale change amount between two adjacent stages on the data line 20 to the auxiliary driving module 32. Exemplarily, the data driving module 31 transmits the grayscale change amount to the scanning driving module 32 through the connection line 51. Such a setting 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 grayscale change amount. Therefore, the present invention embodiment is set in this way, which is beneficial to adjusting the charge and discharge function of the auxiliary driving module 32 according to actual needs, thereby facilitating the precise control of the charge and discharge on the data line 20 and further improving the display uniformity of the display panel.

[0064] Continuing to refer to Figure 5 , in an embodiment of the present invention, optionally, one data line 20 is connected to a column of pixels 10; two adjacent stages on the data line 20 are the driving stages of two adjacent rows of pixels 10. Among them, when the data line 20 is connected to the pixels 10 in a column form, then the scanning line 60 is connected to the pixels 10 in a row form. The scanning line 60 turns on the pixels 10 row by row, and the grayscale voltage on the data line 20 is switched according to the different requirements of each row of pixels 10. Specifically, in the embodiment of the present invention, the data driving module 31 receives the image data, converts the image data into the grayscale voltage required by each pixel 10; and sends the grayscale change amount generated on the data line 20 when scanning two adjacent rows of pixels 10 to the auxiliary driving module 32, and the auxiliary driving module 32 charges and discharges the data line 20 according to the grayscale change amount.

[0065] Exemplarily, after receiving the image data of the client, the data driving module 31 performs a conventional dot-screen operation. When scanning the pixels 10 of the nth row, the RAM (Random Access Memory) in the data driving module 31 records the gray levels of each pixel 10 in the nth row. When scanning the pixels 10 of the (n + 1)th row, the data driving module 31 feeds back the gray level change amount ΔG corresponding to each data line 20 between the (n + 1)th row and the nth row to the auxiliary driving module 32. Specifically, the data driving module 31 and the auxiliary driving module 32 are respectively disposed in two driving chips, which are a data driving chip 81 and an auxiliary driving chip 82. The data driving chip 81 is provided with a feedback output terminal, and the auxiliary driving chip 82 is provided with a feedback input terminal. The feedback output terminal and the feedback input terminal are connected by a connection line 51. The auxiliary driving module 32 receives the gray level change amount ΔG and decides whether to charge or discharge each data line 20 by identifying the magnitude of the gray level change amount ΔG. In the embodiment of the present invention, the data lines 20 are assisted in charging and discharging when scanning each row of pixels 10, that is, the data lines 20 are corrected for each pixel 10, thereby further improving the display uniformity of the display panel.

[0066] Based on the above embodiments, optionally, the gray level change amount ΔG determines the charging and discharging time of the auxiliary driving module 32 for the data line 20. Among them, the larger the gray level change amount ΔG, the longer the charging and discharging time of the auxiliary driving module 32; the smaller the gray level change amount ΔG, the shorter the charging and discharging time of the auxiliary driving module 32. Exemplarily, when the gray level change amount ΔG is large, the difference in the gray level voltage on the data line 20 is large, and the time required to charge and discharge the data line 20 to the expected value is long. Therefore, by extending the charging and discharging time of the auxiliary driving module 32 for the data line 20, it is beneficial for the data line 20 to accurately reach the expected value, thereby improving the accuracy of charging and discharging and further improving the display uniformity of the display panel. When the gray level change amount ΔG is small, the technical principle is similar and will not be elaborated.

[0067] Based on the above embodiments, optionally, it is set that the charging voltage of the auxiliary driving module 32 is the same and the discharging voltage is the same. With this setting, there is no need to set different charging and discharging voltages according to different gray level change amounts ΔG, which is beneficial to simplify the structural design of the auxiliary driving module 32 and reduce costs.

[0068] Figure 6 This is a schematic structural diagram of an auxiliary driving module provided by an embodiment of the present invention. Refer to Figure 6, optionally, the auxiliary driving module 32 includes a first switching unit 321, a second switching unit 322, and a control unit 323; the first switching unit 321 outputs a first voltage V1 for charging under the control of the control unit 323; the second switching unit 322 outputs a second voltage V2 for discharging under the control of the control unit 323; and the control unit 323 controls the conduction time of the first switching unit 321 or the second switching unit 322 according to the gray-scale change amount ΔG. Wherein, the first switching unit 321 and the second switching unit 322 may be transistors, for example, and the control unit 323 may be a microprocessor. With such an arrangement in the embodiment of the present invention, the structure of the auxiliary driving module 32 is simple and easy to implement.

[0069] 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 gray-scale voltage of the pixel 10 and its gray scale. Wherein, the gray scale refers to the emission brightness of the pixel 10. For example, the gray-scale range is 0 to 255 gray scales. The larger the gray-scale value, the brighter the pixel 10, and the smaller the gray-scale value, the darker the pixel 10. 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 enable the pixel 10 to achieve its gray scale. When the gray scale is determined, the setting method of the magnitude of the gray-scale voltage is also different according to different situations.

[0070] In one implementation manner, optionally, the gray-scale voltage of the pixel 10 is negatively correlated with its gray scale, that is, the larger the gray scale, the smaller the gray-scale voltage on the data line 20; the smaller the gray scale, the larger the gray-scale voltage on the data line 20. When the gray-scale change amount is greater than the critical value, the auxiliary driving module 32 discharges the data line 20; when the gray-scale change amount is less than the critical value, the auxiliary driving module 32 charges the data line 20. Wherein, the critical value can be set to 0. Exemplarily, when the gray-scale change amount ΔG > 0, the data line 20 is discharged, and the control unit 323 controls the second switching unit 322 to conduct, and the second voltage V2 is used to discharge the data line 20; when the gray-scale change amount ΔG < 0, the data line 20 is charged, and the control unit 323 controls the first switching unit 321 to conduct, and the first voltage V1 is used to charge the data line 20. Wherein, the first voltage V1 is greater than 0 and has a relatively large value, for example, 10V, 14V, etc., to assist the data line 20 to charge quickly; the second voltage V2 is less than 0 and has a relatively small value, for example, -10V, -14V, etc., to assist the data line 20 to discharge quickly.

[0071] In the above embodiments, the correlation between the gray-scale voltage of the pixel 10 and its gray scale is determined by the circuit of the pixel 10, mainly determined by the type of the driving transistor in the pixel circuit. Hereinafter, a relatively common 7T1C pixel circuit will be used as an example for illustration.

[0072] Figure 7A circuit schematic diagram of a pixel provided by an embodiment of the present invention. Refer to Figure 7 In an embodiment of the present invention, optionally, the pixel 10 includes a pixel circuit 11 and a light-emitting device 12. The pixel circuit 11 includes: a driving transistor M11, a data writing transistor M12, a compensation transistor M13, a first initialization transistor M14, a first light-emitting control transistor M15, a second light-emitting control transistor M16, a second initialization transistor M17, and a storage capacitor Cst1.

[0073] The gate of the data writing transistor M12 is electrically connected to the second scanning line 62 to receive the second scanning signal S2. The first pole of the data writing transistor M12 is electrically connected to the data line 20 to receive the data voltage DATA. The second pole of the data writing transistor M12 is electrically connected to the first pole of the driving transistor M11.

[0074] The gate of the compensation transistor M13 is electrically connected to the second scanning line 62. The first pole of the compensation transistor M13 is electrically connected to the second pole of the driving transistor M11. The second pole of the compensation transistor M13 is electrically connected to the gate of the driving transistor M11. Optionally, the compensation transistor M13 is a double-gate transistor, which is beneficial to suppressing the leakage of the gate of the driving transistor M11.

[0075] The gate of the first initialization transistor M14 is electrically connected to the first scanning line 61 to receive the first scanning signal S1. The first pole of the first initialization transistor M14 is electrically connected to the reference voltage signal line 81 to receive the initialization signal Vref. The second pole of the first initialization transistor M14 is electrically connected to the gate of the driving transistor M11. Optionally, the first initialization transistor M14 is a double-gate transistor, which is beneficial to suppressing the leakage of the gate of the driving transistor M11.

[0076] The gate of the first light-emitting control transistor M15 is electrically connected to the light-emitting control signal line 63 to receive the light-emitting control signal ME. The first pole of the first light-emitting control transistor M15 is electrically connected to the second power supply signal line 82 to receive the second power supply signal ELVDD. The second pole of the first light-emitting control transistor M15 is electrically connected to the first pole of the driving transistor M11.

[0077] The gate of the second light-emitting control transistor M16 is electrically connected to the light-emitting control signal line 63. The first pole of the second light-emitting control transistor M16 is electrically connected to the second pole of the driving transistor M11. The second pole of the second light-emitting control transistor M16 is electrically connected to the anode of the light-emitting device 12.

[0078] The gate of the second initialization transistor M17 is electrically connected to the first scan line 61, the first pole of the second initialization transistor M17 is electrically connected to the initialization signal line 81, and the second pole of the second initialization transistor M17 is electrically connected to the anode of the light-emitting device 12. The cathode of the light-emitting device 12 is electrically connected to the first power supply signal line 83, and the first power supply signal ELVSS is accessed.

[0079] The first end of the storage capacitor Cst1 is electrically connected to the second power supply signal line 82, and the second end of the storage capacitor Cst1 is electrically connected to the gate of the driving transistor M11.

[0080] Among them, the grayscale 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 its gate voltage, the greater the driving current generated, and the greater the light-emitting brightness of the light-emitting device 12, that is, the greater the grayscale. Therefore, for the P-type driving transistor M11, the grayscale voltage of the pixel 10 is negatively correlated with its grayscale.

[0081] Figure 8 It is a schematic diagram of the driving timing of a pixel provided by an embodiment of the present invention. Combining Figure 7 and Figure 8 , the driving timing of the pixel circuit 11 includes: an initialization stage t1, a data writing stage t2, and a light-emitting stage t3.

[0082] In the initialization stage t1, the light-emitting 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 in a conducting state at the initial moment of the next stage.

[0083] In the data writing stage t2, the light-emitting 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 the data voltage DATA is written into the gate of the driving transistor M11.

[0084] 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.

[0085] As can be seen from the above driving process, during the data writing stage t2, the gray-scale voltage on the data line 20 needs to be written to the gate of the driving transistor M11. Therefore, it is necessary to complete the charging and discharging of the data line 20 during the data writing stage t2. Optionally, the data writing stage t2 includes an auxiliary charge and discharge sub-stage t21 and a self-charge and discharge sub-stage t22. During the auxiliary charge and discharge sub-stage t21, the data driving module 31 provides a data voltage DATA, and the auxiliary driving module 32 provides an auxiliary voltage ΔDATA. The data driving module 31 and the auxiliary driving module 32 charge and discharge the data line 20 simultaneously, which can accelerate the charging and discharging speed of the data line 20 and improve the problem of the long charging and discharging time of the data line 20. The auxiliary charge and discharge sub-stage t21 is equivalent to the stage of initializing the charging and discharging of the data line 20, and this initialization process is an initialization in the direction expected by the data line 20. During the self-charge and discharge sub-stage t22, only the data driving module 31 charges and discharges the data line 20 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.

[0086] Among them, the duration of the auxiliary charge and discharge sub-stage t21 is adjusted according to the gray-scale change amount ΔG, and the self-charge and discharge sub-stage t22 can also be adjusted according to the duration of the auxiliary charge and discharge sub-stage t21. Exemplarily, when the duration of the auxiliary charge and discharge sub-stage t21 is longer, the self-charge and discharge sub-stage t22 is correspondingly shorter; when the duration of the auxiliary charge and discharge sub-stage t21 is shorter, the self-charge and discharge sub-stage t22 is correspondingly longer. In the embodiment of the present invention, the data writing stage t2 is set to include the auxiliary charge and discharge sub-stage t21 and the self-charge and discharge sub-stage t22, which is beneficial to the rapid charging and discharging of the data line 20 and can ensure the accuracy of the gray-scale voltage on the data line 20.

[0087] In the above embodiments, the charging and discharging time of the auxiliary driving module 32 can be set as needed. 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 change amount ΔG > 32, it indicates that the gray-scale voltage of the next row is greater than that of the previous row, and it is necessary to discharge the data line 20; when the gray-scale change amount ΔG < -32, it indicates that the gray-scale voltage of the next row is less than that 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 no charging and discharging is required.

[0088] Table 1

[0089]

[0090]

[0091] Figure 9 Another circuit schematic diagram of a pixel provided by an embodiment of the present invention. Refer to Figure 9 , different from the embodiment shown in Figure 7 , each transistor including the driving transistor M11 is an N-type transistor. Correspondingly, 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, and the first pole of the compensation transistor M13 is electrically connected to the first pole of the driving transistor M11; the storage capacitor Cst1 is connected between the gate of the driving transistor M11 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. Among them, the signal for initializing the driving transistor M11 is the first initialization signal Vref1 (high level), and the signal for initializing the anode of the first light-emitting device 12 is the second initialization signal Vref2 (low level).

[0092] Correspondingly, the gray-scale voltage of the pixel 10 has a positive correlation with its gray scale. When the gray-scale change amount ΔG is less than the critical value, the auxiliary driving module 32 discharges the data line 20; when the gray-scale change amount ΔG is greater than the critical value, the auxiliary driving module 32 discharges the data line 20. The specific implementation manner is similar to the foregoing embodiment and will not be described in detail.

[0093] In the above embodiments, it is described that the charge and discharge time of the auxiliary driving module 32 for the data line 20 is determined by the gray-scale change amount △G, which is not a limitation to the present invention. In another embodiment of the present invention, optionally, the gray-scale change amount △G determines the charge and discharge voltage of the auxiliary driving module 32 for the data line 20; the greater the gray-scale change amount △G, the greater the difference between the charge and discharge voltage output by the auxiliary driving module 32 and the gray-scale voltage output by the data driving module 31; the smaller the gray-scale change amount △G, the smaller the difference between the charge and discharge voltage output by the auxiliary driving module 32 and the gray-scale voltage output by the driving module. The technical principle is similar to the foregoing embodiments and will not be described in detail.

[0094] It should be noted that in the above embodiments, the charge and discharge index is exemplified by the gray-scale change amount for illustration, which is not a limitation to the present invention. In other embodiments, the gray-scale voltage change amount can also be used as the charge and discharge index. Different from using the gray-scale change amount as the charge and discharge standard, using the gray-scale voltage change amount is more direct. When the gray-scale voltage change amount is less than the critical value, the auxiliary driving module discharges the data line; when the gray-scale voltage change amount is greater than the critical value, the auxiliary driving module discharges the data line.

[0095] Figure 10 This is a schematic structural diagram of another display panel provided by an embodiment of the present invention. Refer to Figure 10 , based on the above embodiments, optionally, the display panel further includes a power signal line 54, and the power signal line 50 supplies power to the data driving module 31 and the auxiliary driving module 32.

[0096] Optionally, the display panel further includes a synchronization signal line 54. The synchronization signal line 54 is connected to the data driving module 31 and the auxiliary driving module 32, and is used to ensure data synchronization between the data driving module 31 and the auxiliary driving module 32, so as to ensure the accuracy of the auxiliary driving of the data line 20.

[0097] It should also be noted that in the prior art, the display panel is divided into a narrow-sense display panel and a broad-sense display panel. Among them, the narrow-sense display panel only includes pixels 10, a scanning circuit 70 manufactured in the same process as the pixels 10, and various signal lines, etc., and does not include a driving chip. The broad-sense display panel can include a driving chip, a flexible circuit board, etc. in addition to the narrow-sense display panel. In some embodiments, the broad-sense display panel can also be referred to as a display module. The display module not only includes the narrow-sense display panel, but also can include structures such as a driving chip, a flexible circuit board, a buffer foam, a polarizer, and a cover glass. The display panel involved in the embodiments of the present invention is a broad-sense display panel.

[0098] The embodiments of the present invention also provide a driving method for 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 a pixel, the data driving module supplies a gray-scale voltage required by the pixel to the data line; the auxiliary driving module supplies an auxiliary charge and discharge voltage to the data line to assist the data line in charging and discharging.

[0099] In the embodiments of the pixel circuit, specific driving methods are described for different pixel circuits. These driving methods can all be considered as the driving methods of the pixel circuit provided by the embodiments of the present invention, and the repeated content will not be elaborated here.

[0100] The embodiments of the present invention also provide a display device. The display device can be a mobile phone, a computer, a tablet computer, a wearable device, etc. The display device includes the display panel provided by any embodiment of the present invention, and its technical principle and the generated effects are similar and will not be elaborated.

[0101] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, 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 more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, Comprising: Multiple pixels arranged in a preset pattern; Multiple data lines extending 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 line determines the emission brightness of the pixel; A data driving module electrically connected to the multiple data lines; the data driving module is used to provide the gray-scale voltage required by the pixels to the data lines; An auxiliary driving module electrically connected to the multiple data lines; the auxiliary driving module is used to provide an auxiliary charge and discharge voltage to the data lines to assist the data lines in charging and discharging; The auxiliary driving 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 second switch unit outputs a second voltage for discharging under the control of the control unit; and the control unit controls the conduction time of the first switch unit or the second switch unit according to the gray-scale change amount or the gray-scale voltage change amount.

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 line.

3. The display panel according to claim 2, wherein 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.

4. The display panel according to any one of claims 1-3, characterized in that, The data driving module is integrated in a data driving chip; the auxiliary driving module is integrated in an auxiliary driving chip.

5. The display panel according to claim 4, wherein The data driving chip is located at a position close to one end of the data line; the auxiliary driving chip is located at a position close to the other end of the data line.

6. The display panel according to any one of claims 1-3, characterized in that, The display panel is a flexible and curly display panel, and the data lines extend along the long side of the display panel.

7. The display panel according to claim 1, characterized in that The data driving module receives image data, converts the image data into the gray-scale voltage required by each pixel; and sends the gray-scale change amount or the gray-scale voltage change amount between two adjacent stages on the data line to the auxiliary driving module; The auxiliary driving module charges and discharges the corresponding data line according to the gray-scale change amount or the gray-scale voltage change amount.

8. The display panel according to claim 7, wherein One of the data lines is connected to a column of the pixels; two adjacent stages on the data line are the driving stages of two adjacent rows of the pixels.

9. The display panel according to claim 7, wherein The gray-scale change amount or the gray-scale voltage change amount determines the charge and discharge time of the auxiliary driving module for the data line; Wherein, the larger the gray-scale change amount or the gray-scale voltage change amount, the longer the charge and discharge time of the auxiliary driving module; the smaller the gray-scale change amount or the gray-scale voltage change amount, the shorter the charge and discharge time of the auxiliary driving module.

10. The display panel according to claim 7, wherein The gray-scale change amount or the gray-scale voltage change amount determines the charge and discharge voltage of the auxiliary driving module for the data line; The larger the gray-scale change amount or the gray-scale voltage change amount, the larger the difference between the charge and discharge voltage output by the auxiliary driving module and the gray-scale voltage output by the data driving module; the smaller the gray-scale change amount or the gray-scale voltage change amount, the smaller the difference between the charge and discharge voltage output by the auxiliary driving module and the gray-scale voltage output by the driving module.

11. The display panel according to claim 7, wherein, If the gray-scale voltage of the pixel is negatively correlated with its gray scale, when the change amount of the gray scale is greater than the critical value, the auxiliary driving module discharges the data line; when the change amount of the gray scale is less than the critical value, the auxiliary driving module charges the data line; If the gray-scale voltage of the pixel is positively correlated with its gray scale, when the change amount of the gray scale is less than the critical value, the auxiliary driving module discharges the data line; when the change amount of the gray scale is greater than the critical value, the auxiliary driving module discharges the data line.

12. A driving method for a display panel according to any one of claims 1-11, characterized in that, Comprising: When driving the pixel, the data driving module provides the gray-scale voltage required by the pixel to the data line; The auxiliary driving module provides an auxiliary charge-discharge voltage to the data line to assist the data line in charging and discharging.

13. A display device, characterized in that, Comprising the display panel according to any one of claims 1-11.

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