Display device and driving method of display panel

Abstract

The embodiment of the invention provides a display device and a driving method of a display panel, which are used for improving the brightness uniformity of different areas of the display panel. In the display device, a display panel comprises a first display area and a second display area; the driving controller is used for calculating the difference value between the image data voltage of the current frame and the image data voltage of the previous frame of the first display area, and enabling the display panel to work in a multi-frequency mode or a conventional mode according to the difference value, the driving frequency of the first display area is greater than or equal to that of the second display area; in the normal mode, the driving frequency of the first display area is equal to the driving frequency of the second display area.

Description

Technical Field

[0001] This application relates to the field of display technology, and particularly to a driving method for a display device and a display panel. Background Art

[0002] With the continuous development of science and technology, more and more electronic devices with display functions are widely used in people's daily lives and work, bringing great convenience to people's daily lives and work and becoming an indispensable important tool for people today. The main component for an electronic device to achieve the display function is a display panel.

[0003] In multi-frequency display technology (Multi-frequency Display, abbreviated as MFD), the display panel includes at least two display areas driven at different frequencies. Currently, there is a problem of uneven brightness between the display areas driven at different frequencies. Summary of the Invention

[0004] In view of this, this application provides a driving method for a display device and a display panel to improve the brightness uniformity of different areas of the display panel.

[0005] In a first aspect, an embodiment of this application provides a display device, including: A display panel, including a first display area and a second display area; A driving controller, configured to calculate the difference between the image data of the current frame and the image data of the previous frame, and, according to the difference, make the display panel operate in a multi-frequency mode or a normal mode, where In the multi-frequency mode, the driving frequencies of the first display area and the second display area are different; In the normal mode, the driving frequencies of the first display area and the second display area are equal.

[0006] In a second aspect, an embodiment of this invention provides a driving method for a display panel, including: Calculating the difference between the image data of the current frame and the image data of the previous frame, and, according to the difference, making the display panel operate in a multi-frequency mode or a normal mode, where In the multi-frequency mode, the driving frequencies of the first display area and the second display area are different; In the normal mode, the driving frequencies of the first display area and the second display area are equal.

[0007] The display device and the driving method of the display panel provided by the embodiments of the present invention calculate the difference between the image data of the current frame and the image data of the previous frame, and, according to the difference, make the display panel operate in a multi-frequency mode or a normal mode. For example, when the difference is large, the display panel is made to operate in the normal mode, that is, the first display area and the second display area are driven at the same frequency, so that when the image data of the first display area and the second display area change greatly between two adjacent frames, the brightness changes by a similar degree, so as to reduce or even eliminate the brightness difference between the two, improve the brightness consistency of the display panel, and improve the display effect.

[0008] In addition, when the difference is small, the display panel is made to operate in a multi-frequency mode, that is, the first display area and the second display area are driven at different frequencies. For example, the embodiments of the present invention can drive the first display area at a high frequency and drive the second display area at a low frequency, so as to improve the smoothness of the picture in the first display area and, at the same time, reduce the power consumption of the second display area. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0010] Figure 1 A schematic diagram of a display device provided by an embodiment of the present invention; Figure 2 A circuit diagram of a sub-pixel provided by an embodiment of the present invention; Figure 3 A schematic diagram of the partition of a display panel provided by an embodiment of the present invention; Figure 4 For Figure 3 A schematic diagram of the brightness change of different positions in the first display area and the second display area shown at different time periods; Figure 5 A modular schematic diagram of a driving controller provided by an embodiment of the present invention; Figure 6 Another modular schematic diagram of a driving controller provided by an embodiment of the present invention; Figure 7 A modular schematic diagram of a voltage drop compensation unit provided by an embodiment of the present invention; Figure 8 A modular schematic diagram of a voltage drop compensation unit provided by an embodiment of the present invention; Figure 9 A modular schematic diagram of a display device provided by an embodiment of the present invention; Figure 10 Another modular schematic diagram of the display device provided by the embodiment of the present invention; Figure 11 A schematic diagram of a driving method for a display panel provided by the embodiment of the present invention; Figure 12 A schematic diagram of another driving method for a display panel provided by the embodiment of the present invention; Figure 13 A schematic diagram of yet another driving method for a display panel provided by the embodiment of the present invention. Detailed implementation manners

[0011] In order to better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0012] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0013] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0014] It should be understood that the term " / and" used herein is only a relationship describing associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0015] The embodiment of the present invention provides a display device, and the display device may be any device with a display function such as a mobile phone, a tablet computer, a notebook computer, an e-book, a television, a smart watch, etc. As Figure 1 shown, Figure 1 A schematic diagram of a display device provided by the embodiment of the present invention. The display device includes a display panel 1 and a driving controller 2. Among them, the driving controller 2 is used to drive the display panel 1 to display.

[0016] Exemplarily, as Figure 1 shown, the display panel 1 includes a first display area A1 and a second display area A2; both the first display area A1 and the second display area A2 include a plurality of sub-pixels 10.

[0017] In an embodiment of the present invention, the driving controller 2 is configured to calculate the difference between the image data of the current frame and the image data of the previous frame, and, based on the difference, cause the display panel 1 to operate in a multi-frequency mode or a normal mode, wherein, in the multi-frequency mode, the driving frequency of the first display area A1 is different from the driving frequency of the second display area A2; in the normal mode, the driving frequency of the first display area A1 is the same as the driving frequency of the second display area A2.

[0018] Optionally, in combination with Figure 1 and Figure 2 shown, Figure 2 FIG. is a circuit diagram of a sub-pixel provided by an embodiment of the present invention. The sub-pixel 10 includes a pixel driving circuit 11 and a light-emitting element 12 which are electrically connected. The pixel driving circuit 11 is configured to drive the light-emitting element 12 to emit light. Specifically, the pixel driving circuit receives a first power supply voltage PVDD and a data voltage DATA, and generates a driving current based on the first power supply voltage PVDD and the data voltage DATA.

[0019] In an implementable manner, as Figure 2 shown, the pixel driving circuit 11 includes a first thin-film transistor T1, a second thin-film transistor T2, and a storage capacitor Cst. The first pole of the first thin-film transistor T1 is electrically connected to the data voltage terminal DATA, the second pole is electrically connected to the gate of the second thin-film transistor T2, and the gate is electrically connected to the scan signal terminal S. One of the first pole and the second pole is the source electrode, and the other is the drain electrode. The first pole of the second thin-film transistor T2 is electrically connected to the first power supply voltage terminal that provides the first power supply voltage PVDD, and the second pole is electrically connected to the light-emitting element 12. The light-emitting element 12 is electrically connected to the second power supply voltage terminal that provides the second power supply voltage PVEE. The first electrode plate of the storage capacitor Cst is electrically connected to the first power supply voltage terminal that provides the first power supply voltage PVDD, and the second electrode plate is electrically connected to the gate of the second thin-film transistor T2. The current flowing through the light-emitting element 12 is related to the gate-source voltage difference of the second thin-film transistor T2, that is, related to the data voltage DATA and the first power supply voltage PVDD.

[0020] Optionally, as Figure 1 shown, the display panel 1 further includes a scan line SL and a data line DL that are electrically connected to the sub-pixel 10. The scan line SL is electrically connected to the scan signal terminal S of the pixel driving circuit 11, and the data line DL is electrically connected to the data voltage terminal DATA of the pixel driving circuit 11.

[0021] As Figure 1As shown, the display device further includes a gate driving circuit 31 and a data driving circuit 32. The gate driving circuit 31 provides a scanning signal S to the scanning line SL (using the same label as the scanning signal terminal S of the pixel driving circuit), and the data driving circuit 22 is configured to provide a data voltage DATA to the data line DL according to the image data (using the same label as the data voltage terminal DATA of the pixel driving circuit).

[0022] Exemplarily, the above driving frequency can be understood as the frequency for refreshing the data voltage DATA written into the pixel driving circuit 11. That is, the frequency of the enable level of the above scanning signal S.

[0023] As Figure 1 shown, the gate driving circuit 31 can be electrically connected to the above driving controller 2. In the embodiment of the present invention, the driving controller 2 can respectively issue a first mode control signal corresponding to the multi-frequency mode and a second mode control signal corresponding to the normal mode in response to signals corresponding to different differences.

[0024] Under the action of the first mode control signal, the gate driving circuit 31 can make the frequencies of the enable levels of the scanning signal S provided to the first display area A1 and the scanning signal S provided to the second display area A2 different.

[0025] Under the action of the second mode control signal, the gate driving circuit 31 can make the frequencies of the enable levels of the scanning signal S provided to the first display area A1 and the scanning signal S provided to the second display area A2 the same.

[0026] Exemplarily, in the multi-frequency mode, the displayed images in the first display area A1 and the second display area A2 can be different. The driving controller 2 can determine the driving frequency of each display area according to the type of the image to be displayed in each display area (such as a still image or a moving image). For example, the first display area A1 can display a moving image, such as a video. The second display area A2 can display a still image, such as text or a picture. In the multi-frequency mode, the driving frequency of the first display area A1 can be greater than that of the second display area A2. That is, the first display area A1 is a high-frequency area. The second display area A2 is a low-frequency area. Optionally, the above difference can be the difference between the image data of the current frame and the previous frame in the first display area A1.

[0027] In the process of implementing the embodiments of the present invention, the inventors found through research that: when the load differences between the image data corresponding to two adjacent frames are relatively large, the signals on the first power supply line for providing the first power supply voltage PVDD in the display panel 1 will change significantly, thereby affecting the current flowing through the light-emitting elements and the brightness of the light-emitting elements. If the display panel drives the first display area A1 and the second display area A2 at different frequencies at this time, there will be a large difference in their brightness, resulting in a screen flickering problem.

[0028] Specifically, as shown in Figure 3 and Figure 4 , Figure 3 is a schematic diagram of the partition of a display panel provided by an embodiment of the present invention, Figure 4 and Figure 3 is a schematic diagram of the brightness change of different positions in the first display area and the second display area shown at different times. Among them, the first display area A1 is driven at 120 Hz, and the second display area A2 is driven at 10 Hz. The time periods F1 to F10 are the refresh frames (denoted by R in Figure 4 ) of the first display area A1, the time period F7 is the refresh frame of the second display area A2, and the time periods F1 to F6 and the time periods F8 to F10 are the skip frames (denoted by S in Figure 4 ) of the second display area A2. That is, the second display area A2 performs the refresh of the data voltage at the time period F7 and does not perform the refresh of the data voltage at the time periods F1 to F6 and the time periods F8 to F10.

[0029] Taking the image data received at position ④ in the first display area A1 at time period F4 as an example, which switches from 255 gray levels (W255 shown in Figure 4 ) to 0 gray levels (W0 shown in Figure 4 ), this large change in the display gray level will cause a large change in the load of the display panel, and further cause a large change in the first power supply voltage PVDD received by the pixel driving circuit 11, resulting in a change in the brightness of position ③ in the first display area A1.

[0030] And the second display area A2 is in the stage of not performing data refresh at time period F4. As shown in Figure 2 , the voltage change on the first power supply voltage terminal PVDD affects the N1 node in the pixel driving circuit 11 in the second display area A2 through coupling. Therefore, the second display area A2 can maintain the brightness of the previous stage at this time, resulting in a large difference in the brightness between the first display area A1 and the second display area A2. As can be seen from Figure 4 , the time period of the brightness difference between the first display area A1 where position ③ is located and the second display area A2 where position ① is located lasts from time period F4 to time period F7.

[0031] In an embodiment of the present invention, by providing a driving controller 2 in a display device, the driving controller 2 calculates the difference between the image data of the current frame and the image data of the previous frame, and, based on the difference, causes the display panel 1 to operate in a multi-frequency mode or a normal mode.

[0032] For example, when the difference is large, the driving controller 2 can control the display panel 1 to operate in the normal mode, that is, the first display area A1 and the second display area A2 are driven at the same frequency. Still taking Figure 3 the example where the image data received at position ④ in the first display area A1 shown at time period F4 is switched from 255 gray levels to 0 gray levels, although the large change in the display gray levels will cause a large change in the first power supply voltage PVDD, by using the method provided in the embodiment of the present invention, the data voltages of both the first display area A1 and the second display area A2 can be refreshed during this time period, so that the brightness change degrees of the first display area A1 and the second display area A2 can be close, thereby reducing or even eliminating the brightness difference between them, improving the brightness uniformity of the display panel, and improving the display effect.

[0033] When the difference is small, the driving controller 2 can control the display panel 1 to operate in a multi-frequency mode. For example, in an embodiment of the present invention, the first display area A1 can be driven at a high frequency, and the second display area A2 can be driven at a low frequency to improve the frame smoothness of the first display area A1 and reduce the power consumption of the second display area A2.

[0034] It should be noted that Figure 2 the pixel driving circuit 11 shown is only schematic. In an embodiment of the present invention, the structure of the pixel driving circuit 11 can also be designed differently according to different design requirements. For example, the pixel driving circuit 11 can be designed as a "7T1C" structure including 7 thin film transistors and 1 storage capacitor. The embodiment of the present invention does not limit the specific structure of the pixel driving circuit 11.

[0035] Optionally, in an embodiment of the present invention, the positions of the first display area A1 and the second display area A2 can be fixed, or can change according to the change of the image to be displayed.

[0036] Exemplarily, when the difference is greater than a first preset value, the driving controller 2 is used to cause the display panel 1 to operate in the normal mode; when the difference is less than or equal to the first preset value, the driving controller 2 is used to cause the display panel to operate in the multi-frequency mode.

[0037] Optionally, the above first preset value can be set according to the requirements of the structure and performance of the display panel. The embodiment of the present invention does not limit this.

[0038] Exemplarily, asFigure 5 As shown Figure 5 Figure 5 This is a schematic diagram of a module of a driving controller provided by an embodiment of the present invention. The above driving controller 2 includes a difference calculation unit 21 and a mode determination unit 22. Among them, the difference calculation unit 21 is used to calculate the difference between the image data of any sub-pixel in the current frame and the image data of the previous frame, and send the difference to the mode determination unit 22; the mode determination unit 22 is used to make the display panel 1 work in a multi-frequency mode or a normal mode according to the difference.

[0039] Optionally, the mode determination unit 22 can be connected to Figure 1 Figure 1 The gate driving circuit 31 shown is electrically connected. In response to signals corresponding to different differences sent by the difference calculation unit 21, the mode determination unit 22 can send out mode control signals. Exemplarily, the mode control signals include the above-mentioned first mode control signal corresponding to the multi-frequency mode and the above-mentioned second mode control signal corresponding to the normal mode.

[0040] In an implementable manner, the above difference calculation unit 21 includes a current calculation sub-unit, and the current calculation sub-unit is used to calculate the driving current of any sub-pixel 10 in the corresponding frame, and use the driving current as the image data of the sub-pixel 10 in the corresponding frame; among them, the driving current of any sub-pixel 10 Satisfies: ; k is a coefficient corresponding to the sub-pixel 10, and the coefficients k corresponding to sub-pixels 10 with different light-emitting colors may be different; Gray is the gray level of the sub-pixel 10 in the corresponding frame; Gmax represents the peak gray level. For example, when the display panel 1 supports a gray-scale voltage accuracy of 8 bits, the peak gray level is 255 gray levels.

[0041] Exemplarily, the difference between the image data of the current frame and the image data of the previous frame Satisfies: ; Among them, Gray1 is the gray level of the sub-pixel 10 in the current frame, and Gray2 is the gray level of the sub-pixel 10 in the previous frame. Based on this setting method, the difference between the image data of the current frame and the image data of the previous frame can be obtained according to the gray levels of the sub-pixel 10 in two adjacent frames, and then the working mode of the display panel 1 can be determined according to the difference.

[0042] Optionally, as Figure 6 shown Figure 6This is a schematic diagram of another driving controller provided by an embodiment of the present invention. The driving controller 2 further includes a frequency acquisition unit 23 and a duration setting unit 24. Exemplarily, when the difference between the image data of the current frame and the image data of the previous frame is greater than a first preset value, the frequency acquisition unit 23 is configured to acquire the occurrence frequency of the difference being greater than the first preset value, and send the occurrence frequency to the duration setting unit 24; the duration setting unit 24 is configured to control the working duration of the display panel 1 in the normal mode according to the occurrence frequency.

[0043] Exemplarily, the above-mentioned duration setting unit 24 is configured to control the working duration of the display panel 1 in the normal mode to be the duration of one frame when the occurrence frequency is less than or equal to a first reference frequency. Exemplarily, when entering the next frame, the difference calculation unit 21 can continue to calculate the difference between the image data of adjacent two frames in real time, and adjust the working mode of the display panel 1 in real time according to the difference.

[0044] Moreover, when the above-mentioned occurrence frequency is greater than the first reference frequency, the duration setting unit 24 can control the working duration of the display panel 1 in the normal mode to be greater than the duration of one frame, and during the period when the display panel 1 works in the normal mode, the difference calculation unit 21 can stop calculating the difference between the image data of adjacent two frames. Based on this setting method, when the occurrence frequency of the difference between the image data of the current frame and the image data of the previous frame is relatively high, the working duration of the display panel 1 in the normal mode can be extended, avoiding frequent switching between the normal mode and the multi-frequency mode of the display panel 1. On the one hand, it can reduce the power consumption of the display device and save computing power. On the other hand, it can also avoid the flicker problem of the display panel caused by frequent switching of the working mode.

[0045] Optionally, as Figure 7 shown, Figure 7 This is a schematic diagram of another display device provided by an embodiment of the present invention. The display device further includes a voltage drop compensation unit 4. The voltage drop compensation unit 4 is configured to compensate the voltage drop of the first power supply voltage PVDD received by different sub-pixels 10 by using the data voltage DATA (IR drop Compensation, abbreviated as IRC). For example, when the difference between the image data of adjacent two frames is relatively large, adopting the setting method provided by the embodiment of the present invention, the voltage drop compensation unit 4 can compensate the voltage drop of the first power supply voltage PVDD, so as to compensate the influence of the change of the first power supply voltage PVDD on the driving current of the sub-pixels 10, improve the brightness stability of the first display area A1 and the second display area A2, and further improve the brightness uniformity of the display panel and weaken the flash problem.

[0046] Exemplarily, the above-mentioned voltage drop compensation unit 4 can compensate the voltage drop of the first power supply voltage PVDD in real time, or, alternatively, it can be delayed for a period of time, such as delayed by one frame for compensation.

[0047] Optionally, in combination with Figure 7 and Figure 8 as shown, Figure 8 FIG. is a modular schematic diagram of a voltage drop compensation unit provided by an embodiment of the present invention. The above-mentioned voltage drop compensation unit 4 includes a voltage detection sub-unit 41 and a compensation calculation sub-unit 42. Among them, the voltage detection sub-unit 41 is used to detect the actual value of the first power supply voltage PVDD received by the pixel driving circuit 11; the compensation calculation sub-unit 42 is used to calculate the difference between the actual value and the ideal value of the first power supply voltage, and send the compensation value generated according to the difference between the actual value and the ideal value to the data driving circuit 32. The data driving circuit 32 can provide the compensated data voltage DATA to the pixel driving circuit 11 according to the compensation value.

[0048] Exemplarily, as Figure 9 shown, Figure 9 FIG. is a modular schematic diagram of a display device provided by an embodiment of the present invention. The display device includes a driving chip (Driver IC) 5. The driving chip 5 includes a timing controller 51. The timing controller 51 is electrically connected to the above-mentioned driving controller 2. The driving controller 51 is used to output a mode control signal to the timing controller 2. The mode control signal is used to enable the timing controller 51 to control the display panel 1 to switch between a multi-frequency mode and a normal mode. As Figure 9 shown, the timing controller 51 is electrically connected to the above-mentioned gate driving circuit 31 and data driving circuit 32.

[0049] Optionally, at least one of the above-mentioned driving controller 2, gate driving circuit 31, and data driving circuit 32 can be integrated into the driving chip 5. Figure 9 Taking the driving controller 2, gate driving circuit 31, and data driving circuit 32 all being integrated into the driving chip 5 as an example.

[0050] Exemplarily, as Figure 10 shown, Figure 10 FIG. is another modular schematic diagram of a display device provided by an embodiment of the present invention. The display device further includes an application management module 6. The application management module 6 is electrically connected to the above-mentioned timing controller 51; in the embodiment of the present invention, the above-mentioned driving controller 2 can also be integrated into the application management module 6.

[0051] Based on the same inventive concept, an embodiment of the present invention also provides a driving method for a display panel. In combination with Figure 1 and Figure 11 as shown, Figure 11Schematic diagram of a driving method for a display panel provided by an embodiment of the present invention. The display panel 1 includes a first display area A1 and a second display area A2. The driving method includes: Step S1: Calculate the difference between the image data of the current frame and the image data of the previous frame; Step S2: According to the difference, make the display panel 1 operate in a multi-frequency mode or a normal mode.

[0052] Among them, in the multi-frequency mode, the driving frequencies of the first display area A1 and the second display area A2 are different; for example, the driving frequency of the first display area A1 can be greater than the driving frequency of the second display area A2. Optionally, the above difference can be the difference between the image data of the current frame and the image data of the previous frame of the first display area A1.

[0053] In the normal mode, the driving frequencies of the first display area A1 and the second display area A2 are the same.

[0054] The driving method of the display panel 1 provided by the embodiment of the present invention calculates the difference between the image data of the current frame and the image data of the previous frame, and, according to the difference, makes the display panel 1 operate in a multi-frequency mode or a normal mode.

[0055] For example, when the difference is large, make the display panel 1 operate in the normal mode, that is, drive the first display area A1 and the second display area A2 with the same frequency, so that the brightness of the first display area A1 and the second display area A2 changes to a similar extent when the image data in two adjacent frames changes greatly, so as to reduce or even eliminate the brightness difference between the two, improve the brightness consistency of the display panel, and improve the display effect.

[0056] In addition, when the difference is small, make the display panel 1 operate in the multi-frequency mode, that is, drive the first display area A1 and the second display area A2 with different frequencies. For example, the embodiment of the present invention can drive the first display area A1 with a high frequency and drive the second display area A2 with a low frequency, so as to improve the smoothness of the picture of the first display area A1 and reduce the power consumption of the second display area A2.

[0057] Exemplarily, as Figure 12 shown, Figure 12 Schematic diagram of another driving method for a display panel provided by an embodiment of the present invention; the above step S2 includes: Step S21: Determine whether the difference is greater than a first preset value; if so, execute step S22; if not, that is, when the difference is less than or equal to the first preset value, execute step S23; Step S22: Make the display panel operate in the normal mode.

[0058] Step S23: Make the display panel operate in a multi-frequency mode.

[0059] Exemplarily, calculating the difference between the image data of the current frame and the image data of the previous frame in step S1 above includes: Calculating the difference between the current and previous currents of any sub-pixel, where the current WAPLn of any sub-pixel in the corresponding frame satisfies: ; where k is the coefficient corresponding to sub-pixel 10, and the coefficients k corresponding to sub-pixels 10 with different light-emitting colors may be different; Gray is the gray scale of sub-pixel 10 in the corresponding frame; Gmax represents the peak gray scale. For example, when the display panel 1 supports a gray-scale voltage accuracy of 8 bits, the peak gray scale is 255 gray levels.

[0060] Exemplarily, as Figure 13 shown, Figure 13 is a schematic diagram of another driving method for a display panel provided by an embodiment of the present invention. When the difference between the image data of two adjacent frames is greater than a first preset value, making the display panel 1 operate in the normal mode in step S22 above includes: Step S221: Obtain the occurrence frequency of the difference being greater than the first preset value; Step S222: Determine whether the occurrence frequency is greater than a first reference frequency. If so, execute step S223; if not, that is, when the occurrence frequency is less than or equal to the first reference frequency, execute step S224; Step S223: Control the working duration of the display panel 1 in the normal mode to be greater than the duration of one frame, and during the period when the display panel 1 operates in the normal mode, stop calculating the difference between the image data of two adjacent frames. Based on this setting method, when the occurrence frequency of the difference between the image data of the current frame and the image data of the previous frame is relatively high, the working duration of the display panel 1 in the normal mode can be extended, avoiding frequent switching between the normal mode and the multi-frequency mode of the display panel 1. On the one hand, it can reduce the power consumption of the display device and save computing power. On the other hand, it can also avoid the flicker problem of the display panel caused by frequent switching of the working mode.

[0061] Step S224: Control the working duration of the display panel 1 in the normal mode to be the duration of one frame. Exemplarily, when entering the next frame, the difference between the image data of two adjacent frames can be continuously calculated, and the working mode of the display panel 1 can be adjusted in real time according to the difference.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display device, characterized in that: include: The display panel comprises a first display area and a second display area; A driving controller is used to calculate the difference between the image data of the current frame and the image data of the previous frame, and, according to the difference, to make the display panel work in the multi-frequency mode or the normal mode, wherein: In the multi-frequency mode, the driving frequency of the first display area is different from the driving frequency of the second display area; In the normal mode, a driving frequency of the first display area is the same as a driving frequency of the second display area.

2. The display device according to claim 1, characterized in that When the difference is greater than a first preset value, the driving controller is used to make the display panel operate in the normal mode; When the difference is less than or equal to the first preset value, the driving controller is used to make the display panel operate in the multi-frequency mode.

3. The display device according to claim 1, characterized in that The first display area and the second display area each include a plurality of sub-pixels; The driving controller includes a difference calculation unit and a mode determination unit, The difference calculation unit is used to calculate the difference between the image data of the current frame and the image data of the previous frame of any sub-pixel, and send the difference to the mode determination unit; The mode determination unit is used to enable the display panel to operate in a multi-frequency mode or a normal mode according to the difference.

4. The display device according to claim 3, characterized in that: The difference calculation unit includes a current calculation subunit, and the current calculation subunit is used to calculate the driving current of any of the sub-pixels in the corresponding frame, and use the driving current as the image data of the sub-pixel in the corresponding frame; wherein, The driving current of any of the sub-pixels satisfy: ； k is a coefficient corresponding to the sub-pixel; Gray is the grayscale of the sub-pixel in the corresponding frame; and Gmax represents the peak grayscale.

5. The display device according to claim 3, characterized in that: The drive controller also includes a frequency acquisition unit and a duration setting unit. When the difference between the image data of the current frame and the image data of the previous frame is greater than a first preset value, the frequency acquisition unit is used to acquire the occurrence frequency of the difference being greater than the first preset value, and send the occurrence frequency to the duration setting unit; The duration setting unit is used to control the working duration of the display panel in the normal mode according to the occurrence frequency.

6. The display device according to claim 5, characterized in that: The duration setting unit is used to control the working duration of the display panel in the normal mode to be a duration of one frame when the occurrence frequency is less than or equal to the first reference frequency; as well as, When the occurrence frequency is greater than the first reference frequency, the display panel is controlled to operate in the normal mode for a duration greater than one frame, and the calculation of the difference between the image data of two adjacent frames is stopped during the period when the display panel operates in the normal mode.

7. The display device according to claim 1, characterized in that: The first display area and the second display area each include a plurality of sub-pixels, and the sub-pixels include a pixel driving circuit, the pixel driving circuit receives a first power supply voltage and a data voltage, and generates a driving current according to the first power supply voltage and the data voltage; The display device further includes a voltage drop compensation unit, and the voltage drop compensation unit is used to compensate for the voltage drop of the first power supply voltage received by different sub-pixels by using the data voltage.

8. The display device according to claim 7, characterized in that: The display device comprises a data driving circuit, wherein the data driving circuit is used to provide the data voltage to the pixel driving circuit; The voltage drop compensation unit comprises: a voltage detection subunit, configured to detect an actual value of the first power supply voltage received by the pixel driving circuit; a compensation calculation subunit, configured to calculate a difference between the actual value and an ideal value of the first power supply voltage, and generate a compensation value according to the difference between the actual value and the ideal value; The data driving circuit is used for providing the compensated data voltage to the pixel driving circuit according to the compensation value.

9. The display device according to claim 1, characterized in that: The display device includes a driving chip, the driving chip includes a timing controller, the timing controller is electrically connected to the driving controller, the driving controller is used to output a mode control signal to the timing controller, and the mode control signal is used to enable the timing controller to control the display panel to switch between the multi-frequency mode and the normal mode.

10. The display device according to claim 9, characterized in that: The driving controller is integrated into the driving chip.

11. The display device according to claim 9, characterized in that The display device further comprises an application management module, wherein the application management module is electrically connected to the timing controller; The drive controller is integrated into the application management module.

12. A method for driving a display panel, characterized in that: The display panel includes a first display area and a second display area, and the driving method includes: Calculating the difference between the image data of the current frame and the image data of the previous frame, and, according to the difference, making the display panel operate in a multi-frequency mode or a normal mode, wherein: In the multi-frequency mode, the driving frequency of the first display area is different from the driving frequency of the second display area; In the normal mode, a driving frequency of the first display area is the same as a driving frequency of the second display area.

13. The driving method according to claim 12, characterized in that: When the difference is greater than a first preset value, the display panel operates in the normal mode; When the difference is less than or equal to the first preset value, the display panel is operated in the multi-frequency mode.

14. The driving method according to claim 12, characterized in that: The calculating the difference between the image data of the current frame and the image data of the previous frame comprises: The difference between the current of any sub-pixel in the current frame and the current of the previous frame is calculated, wherein the current WAPLn of any sub-pixel in the corresponding frame satisfies: ； k is a coefficient corresponding to the sub-pixel; Gray is the grayscale of the sub-pixel in the corresponding frame; and Gmax represents the peak grayscale.

15. The driving method according to claim 12, characterized in that: When the difference is greater than a first preset value, the display panel is operated in the normal mode, comprising: Obtaining the occurrence frequency of the difference being greater than the first preset value; When the occurrence frequency is less than or equal to the first reference frequency, controlling the display panel to work for a duration of one frame in the normal mode; When the occurrence frequency is greater than the first reference frequency, the display panel is controlled to operate in the normal mode for a duration greater than one frame, and the calculation of the difference between the image data of two adjacent frames is stopped during the period when the display panel operates in the normal mode.

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