Driving method and device of display panel and display device

Abstract

The invention discloses a driving method and device of a display panel and a display device, and belongs to the technical field of display. The method comprises the following steps: acquiring a frequency switching instruction under the condition that a display panel performs display by at least two display partitions with different refresh frequencies; the frequency switching instruction is an instruction for controlling at least one display partition to perform frequency switching; obtaining a preset brightness change value of each display subarea before and after frequency switching if the corresponding display subarea is controlled to perform frequency switching according to the frequency switching instruction; according to the preset brightness change value of each display subarea, determining a compensation value of the initialization voltage in the process of controlling the corresponding display subarea to perform frequency switching according to the frequency switching instruction, and compensating the initialization voltage according to the compensation value, so that the actual brightness change of each display subarea before and after the frequency switching is smaller than a preset brightness threshold value; wherein the initialization voltage is supplied to the sub-pixels. According to the embodiment of the invention, the problem of frequency switching flicker of the display panel during partition multi-frequency display can be solved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel driving method and device, and a display device. Background Art

[0002] With the development of display technology, partition multi-frequency technology is gradually gaining attention. Dividing a screen into different areas and matching different refresh frequencies according to the displayed content can achieve fine scene control while reducing power consumption. However, in related technologies, the display panel has the problem of frequency switching flickering when displaying in partition multi-frequency display. Summary of the invention

[0003] The present invention provides a display panel driving method and device, and a display device, so as to solve the problem of frequency switching flickering when the display panel performs partition multi-frequency display.

[0004] In a first aspect, an embodiment of the present invention provides a method for driving a display panel, comprising:

[0005] When the display panel is displayed in at least two display partitions with different refresh frequencies, a frequency switching instruction is obtained; wherein the frequency switching instruction is an instruction for controlling at least one of the display partitions to switch the frequency;

[0006] Obtaining a predetermined brightness change value of each display partition before and after the frequency switching if the corresponding display partition is controlled to switch the frequency according to the frequency switching instruction;

[0007] According to the predetermined brightness change value of each of the display partitions, a compensation value of the initialization voltage in the process of controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction is determined, and the initialization voltage is compensated according to the compensation value so that the actual brightness change of each of the display partitions before and after the frequency switching is less than a preset brightness threshold; wherein the initialization voltage is provided to the sub-pixels in the display panel.

[0008] Optionally, all sub-pixels in the display panel are connected to the same initialization voltage; before determining, according to the predetermined brightness change value of each display partition, a compensation value of the initialization voltage in the process of controlling the corresponding display partition to perform frequency switching according to the frequency cutting instruction, and compensating the initialization voltage according to the compensation value, the method further includes:

[0009] Determine whether the following conditions are met: the predetermined brightness change values ​​of all the display partitions exceed the preset brightness threshold, and the brightness change trends are consistent;

[0010] If yes, determining a compensation value of the initialization voltage in the process of controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction according to the predetermined brightness change value of each display partition, and compensating the initialization voltage according to the compensation value;

[0011] If not, the initialization voltage is not compensated.

[0012] Optionally, the process of controlling the corresponding display partition to switch the frequency according to the frequency switching instruction includes a transition phase and a steady-state phase occurring in sequence; wherein, in the transition phase, each of the display partitions that need to switch the frequency is adjusted from the frequency before the switching to the frequency after the switching; in the steady-state phase, each of the display partitions that need to switch the frequency maintains the frequency after the switching; the predetermined brightness change value of any display partition before and after the frequency switching includes: a first brightness change value of the display partition in the transition phase compared to before the frequency switching, and a second brightness change value of the display partition in the steady-state phase compared to the transition phase;

[0013] According to the predetermined brightness change value of each display partition, determining a compensation value of an initialization voltage in a process of controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction, and compensating the initialization voltage according to the compensation value, including:

[0014] If the first brightness change values ​​of all the display partitions in the transition stage compared to before the frequency switching exceed the preset brightness threshold, and the brightness change trends are consistent, then from the start time of the transition stage, the first compensation value of the initialization voltage is determined according to the first brightness change value of each of the display partitions, and the initialization voltage before the frequency switching is compensated according to the first compensation value, so that the actual brightness change of each of the display partitions in the transition stage compared to before the frequency switching is less than the preset brightness threshold;

[0015] And / or, if the second brightness change values ​​of all the display partitions in the steady state stage compared to the transition stage exceed the preset brightness threshold, and the brightness change trends are consistent, then from the start time of the steady state stage, the second compensation value of the initialization voltage is determined according to the second brightness change value of each of the display partitions, and the initialization voltage in the transition stage is compensated according to the second compensation value, so that the actual brightness change of each of the display partitions in the steady state stage compared to the transition stage is less than the preset brightness threshold;

[0016] Preferably, the transition stage includes: starting to control the corresponding display partition to perform frequency switching according to the frequency cutting instruction, and each display frame between the first full refresh frame and the second full refresh frame; wherein the full refresh frame is a display frame in which data is written to all sub-pixels in the display partition.

[0017] Optionally, if each of the display partitions that need to perform frequency switching specified in the frequency cutting instruction performs frequency switching between the first frequency range and the second frequency range, and the frequency change trend is consistent, then from the start time of the transition stage, the first compensation value of the initialization voltage is determined according to the first brightness change value of each of the display partitions, and the initialization voltage before the frequency switching is compensated according to the first compensation value, and the same initialization voltage as that in the transition stage is maintained in the steady-state stage; wherein the frequency lower limit value within the first frequency range is greater than the frequency upper limit value within the second frequency range;

[0018] If the display partitions that need to perform frequency switching specified in the frequency cutting instruction all perform frequency switching between the third frequency range and the fourth frequency range, and the frequency change trends are consistent, then the initialization voltage before the frequency switching is maintained in the transition stage, and from the beginning of the steady-state stage, the second compensation value of the initialization voltage is determined according to the second brightness change value of each display partition, and the initialization voltage in the transition stage is compensated according to the second compensation value; wherein the upper frequency limit value in the third frequency range is less than or equal to the upper frequency limit value in the second frequency range, and the lower frequency limit value in the third frequency range is greater than or equal to the upper frequency limit value in the fourth frequency range.

[0019] Optionally, each frequency within the first frequency range, each frequency within the second frequency range, each frequency within the third frequency range, and each frequency within the fourth frequency range can divide a reference frequency; and the reference frequency is a positive integer multiple of an upper frequency limit within the first frequency range;

[0020] Preferably, the reference frequency is 360 Hz, the first frequency range includes: frequencies from 60 Hz to 120 Hz that are evenly divisible by 360 Hz, the second frequency range includes: 30 Hz, the third frequency range includes: frequencies from 10 Hz to 30 Hz that are evenly divisible by 360 Hz, and the fourth frequency range includes: frequencies from 1 Hz to 10 Hz that are evenly divisible by 360 Hz.

[0021] Optionally, the frequency switching instruction is an instruction for controlling at least two display partitions to perform frequency switching; the obtaining of a predetermined brightness change value of each display partition before and after the frequency switching if the corresponding display partition is controlled to perform frequency switching according to the frequency switching instruction includes:

[0022] For any target display partition, before and after the frequency switching of each display partition that performs frequency switching according to the frequency switching instruction, the brightness change value of the target display partition in the transition phase compared with that before the frequency switching is superimposed as the first brightness change value of the target display partition;

[0023] For any target display partition, after the frequency switching of each display partition that performs frequency switching according to the frequency cutting instruction, the brightness change value of the target display partition in the steady state stage compared with that in the transition stage is superimposed as the second brightness change value of the target display partition.

[0024] Optionally, determining the first compensation value of the initialization voltage according to the first brightness change value of each display partition includes:

[0025] For any of the display partitions, determining a first voltage compensation range of an initialization voltage corresponding to the display partition according to a first brightness change value of the display partition;

[0026] Taking an intersection of the first voltage compensation ranges to obtain a second voltage compensation range of the initialization voltage corresponding to the display panel, and selecting any voltage value in the second voltage compensation range as the first compensation value;

[0027] Determining a second compensation value of the initialization voltage according to the second brightness change value of each of the display partitions includes:

[0028] For any of the display partitions, determining a third voltage compensation range of the initialization voltage corresponding to the display partition according to the second brightness change value of the display partition;

[0029] An intersection of the third voltage compensation ranges is taken to obtain a fourth voltage compensation range of the initialization voltage corresponding to the display panel, and any voltage value in the fourth voltage compensation range is selected as the second compensation value.

[0030] Optionally, the sub-pixel includes: a pixel circuit and a light-emitting device; the pixel circuit includes: a driving transistor, a data writing transistor, a threshold compensation transistor, a first light-emitting control transistor, a second light-emitting control transistor, a first initialization transistor, a second initialization transistor and a third initialization transistor; the first light-emitting control transistor, the driving transistor, the second light-emitting control transistor and the light-emitting device are connected in series in sequence, the data writing transistor is connected to the first electrode of the driving transistor, the threshold compensation transistor is connected between the gate and the second electrode of the driving transistor, the first initialization transistor and the second initialization transistor are both connected to the second electrode of the driving transistor; the third initialization transistor is connected to the anode of the light-emitting device;

[0031] The initialization voltage is provided to the first initialization transistor, the second initialization transistor, or the third initialization transistor.

[0032] Optionally, the initialization voltage is provided to the third initialization transistor; if the brightness of all the display partitions increases after the frequency switching, the compensation value is a negative value; if the brightness of all the display partitions decreases after the frequency switching, the compensation value is a positive value;

[0033] or,

[0034] The initialization voltage is provided to the first initialization transistor or the second initialization transistor, and the driving transistor is a P-type transistor; if the brightness of all the display partitions increases after the frequency switching, the compensation value is a positive value; if the brightness of all the display partitions decreases after the frequency switching, the compensation value is a negative value.

[0035] In a second aspect, an embodiment of the present invention further provides a driving device for a display panel, comprising:

[0036] An instruction acquisition module, used to acquire a frequency switching instruction when the display panel displays in at least two display partitions with different refresh frequencies; wherein the frequency switching instruction is an instruction for controlling at least one of the display partitions to switch the frequency;

[0037] A brightness change acquisition module, used to acquire a predetermined brightness change value of each display partition before and after the frequency switching if the corresponding display partition is controlled to switch the frequency according to the frequency switching instruction;

[0038] A frequency cutting control module is used to determine, according to a predetermined brightness change value of each display partition, a compensation value of an initialization voltage in the process of controlling the corresponding display partition to perform frequency switching according to the frequency cutting instruction, and compensate the initialization voltage according to the compensation value so that the actual brightness change of each display partition before and after the frequency switching is less than a preset brightness threshold; wherein the initialization voltage is provided to the sub-pixels in the display panel.

[0039] In a third aspect, an embodiment of the present invention further provides a display device, characterized in that it comprises: a display panel and a driving chip, wherein the driving chip is used to execute the display panel driving method provided by any embodiment of the present invention.

[0040] The driving method of the display panel provided by the embodiment of the present invention dynamically sets the initialization voltage in the partitioned multi-frequency display mode. When the frequency switching of at least one display partition causes a flickering problem, the compensation value of the initialization voltage is adjusted by taking into account the predetermined brightness change value of each display partition before and after the frequency switching, thereby compensating for the brightness change of each display partition caused by the frequency switching of at least one display partition, so that the actual brightness change of each display partition before and after the frequency switching is less than the preset brightness threshold, thereby solving the frequency switching flicker problem of the display panel in the partitioned multi-frequency display.

[0041] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 is a schematic flow chart of a method for driving a display panel provided by an embodiment of the present invention;

[0044] Figure 2 is a structural schematic diagram of a display panel provided by an embodiment of the present invention;

[0045] Figure 3 It is a schematic diagram of brightness change when a display partition performs frequency switching provided by an embodiment of the present invention;

[0046] Figure 4 is a driving timing diagram of a display panel provided by an embodiment of the present invention;

[0047] Figure 5 is a driving timing diagram of another display panel provided by an embodiment of the present invention;

[0048] Figure 6 is a schematic diagram of the structure of a sub-pixel provided by an embodiment of the present invention;

[0049] Figure 7 is a schematic structural diagram of a driving device for a display panel provided by an embodiment of the present invention;

[0050] Figure 8 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0053] An embodiment of the present invention provides a method for driving a display panel. By adjusting the initialization voltage, the problem of frequency switching flicker in a partitioned multi-frequency display mode can be effectively improved. The method can be executed by a driving device of the display panel. The driving device of the display panel can be implemented in the form of hardware and / or software. The driving device of the display panel can be configured in a driving chip of the display device.

[0054] Figure 1 FIG. 1 is a flow chart of a method for driving a display panel provided by an embodiment of the present invention. Figure 1 As shown, the method includes:

[0055] S110 . When the display panel performs display in at least two display partitions with different refresh frequencies, obtain a frequency switching instruction.

[0056] Among them, the frequency switching instruction is an instruction to control at least one display partition to switch the frequency. The situation in which the display panel displays at least two display partitions with different refresh frequencies is the partition multi-frequency display mode of the display panel. In the partition multi-frequency display mode, the display partition with a higher refresh frequency can be used to display pictures such as games, live broadcasts and movies, and the display partition with a lower refresh frequency can be used to display pictures such as barrage, chat interface and clock. The boundary position of the display partition can be fixed or adjustable. The specific number of display partitions, division method and refresh frequency of the display panel can be adapted according to user needs.

[0057] Figure 2 is a schematic diagram of the structure of a display panel provided by an embodiment of the present invention. Figure 2 , exemplarily, the display panel 100 includes: a scanning circuit 10 and a plurality of sub-pixels 20. The scanning circuit 10 is, for example, disposed in the non-display area NAA of the display panel 100, and the plurality of sub-pixels 20 are, for example, arranged in an array in the display area AA of the display panel 100. The plurality of scanning output terminals of the scanning circuit 10 can be respectively connected to the sub-pixels 20 in each row through the scanning lines LS to provide the scanning signals Scan to the sub-pixels 20, and one scanning output terminal of the scanning circuit 10 can be connected to at least one scanning line LS. The scanning circuit 10 controls the pulse frequency of the scanning signal Scan output to each sub-pixel 20 according to the frequency control signal SW connected thereto; by controlling the pulse frequencies of the scanning signals Scan outputted from at least two scanning output terminals to be different, the display panel can be displayed in at least two display partitions with different refresh frequencies. The driving chip can adjust the voltage change of the frequency control signal SW according to the frequency switching instruction to realize the frequency switching of the display partitions that need to be frequency switched as specified in the frequency switching instruction.

[0058] Figure 2Exemplarily, the display panel includes three display partitions, namely, a first display partition A1, a second display partition A2 and a third display partition A3. It is understandable that the number of display partitions in the display panel 100 can be set according to actual needs, and the boundary position between different display partitions can be fixed or adjustable, which is not limited here. Among them, the scanning signal Scan can be used to control whether the gate initialization process and the data writing process in the sub-pixel 20 are performed. The scanning signal Scan is provided to the gate of the threshold compensation transistor in the pixel circuit of the sub-pixel 20. The pulse of the scanning signal Scan refers to the conduction pulse in the scanning signal Scan for controlling the conduction of the transistor connected to the scanning signal Scan. Correspondingly, the pulse frequency of the scanning signal Scan refers to the frequency of the guide pulse. The pulse frequency of each scanning signal connected in the same display partition is the same, and the pulse frequency is the refresh frequency of the display partition. The scanning circuit 10 may include a cascaded multi-stage shift register, the output end of the shift register is used as the scan output end, and the frequency control signal SW is connected to each stage of the shift register. The frequency control signal SW can be used to control whether the shift register can shift the input signal connected and output it as the scanning signal Scan, or it can directly control the voltage of the scanning signal Scan output by the shift register. In short, the frequency control signal SW is used to adjust the pulse frequency of the scanning signal Scan output by the shift register, and the specific control method is not limited here.

[0059] S120, obtaining a predetermined brightness change value of each display partition before and after the frequency switching if the corresponding display partition is controlled to perform frequency switching according to the frequency switching instruction.

[0060] Among them, this step is a pre-processing step before formally controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction. The driver chip can pre-store the brightness change of each display partition under the frequency switching of each display partition. In this step, after obtaining the frequency cutting instruction, the specific frequency switching situation of each display partition that needs to be frequency switched can be learned by analyzing the frequency cutting instruction. According to the specific frequency switching situation, the stored information can be searched to obtain the predetermined brightness change value of each display partition before and after the frequency switching. According to the predetermined brightness change value of each display partition, it can be determined whether to compensate the initialization voltage, and the compensation value of the initialization voltage can be determined when compensation is required.

[0061] Specifically, any display partition is used as the target display partition. When only one display partition needs to be switched in frequency, for the target display partition, the brightness change value of the target display partition before and after the frequency switching of the display partition that needs to be switched can be used as the predetermined brightness change value of the target display partition; when there are at least two display partitions that need to be switched in frequency, for the target display partition, the brightness change values ​​of each display partition that performs frequency switching according to the frequency switching instruction before and after the frequency switching can be superimposed as the predetermined brightness change value of the target display partition. Among them, the driver chip can pre-store the brightness change values ​​corresponding to all display partitions after any display partition performs any frequency switching. Accordingly, after receiving the frequency switching instruction, the display partition that needs to be switched in frequency can be determined first; then, according to the stored information, the brightness change values ​​of each display partition that needs to be switched in frequency before and after the frequency switching are obtained; then, for any display partition, the brightness change values ​​of the display partition before and after the frequency switching of all display partitions that need to be switched in frequency can be superimposed to obtain the predetermined brightness change value of the display partition.

[0062] S130. Determine, based on a predetermined brightness change value of each display partition, a compensation value of an initialization voltage in a process of controlling a corresponding display partition to perform frequency switching according to a frequency cutting instruction, and compensate the initialization voltage based on the compensation value, so that an actual brightness change of each display partition before and after the frequency switching is less than a preset brightness threshold.

[0063] Among them, see Figure 2 , the initialization voltage Vref is provided to the sub-pixel 20 in the display panel 100. Specifically, a plurality of initialization signal lines LREF may be arranged in the display panel 100, respectively connected to each sub-pixel 20, so as to provide the initialization voltage Vref to each sub-pixel 20. Figure 2 As shown, all sub-pixels 20 in the display panel 100 can be set to access the same initialization voltage Vref, that is, the initialization voltage Vref is a global signal that is unified for the entire screen. Alternatively, at least some of the sub-pixels 20 can be set to access different initialization voltages Vref, for example, sub-pixels 20 in different display partitions are connected to different initialization voltages Vref, and sub-pixels 20 in the same display partition are connected to the same initialization voltage Vref. The specific wiring method is not limited here. Among them, by initializing the sub-pixel 20 using the initialization voltage Vref, the state of key components (such as driving transistors or light-emitting devices) in the sub-pixel 20 can be restored. By adjusting the initialization voltage Vref, the initialization degree of the sub-pixel 20 can be adjusted, thereby adjusting the display brightness of the sub-pixel 20 without changing the data voltage.

[0064] The preset brightness threshold is, for example, a brightness change threshold that can be perceived by the human eye. Exemplarily, the initialization voltage may be compensated when the predetermined brightness change value of at least one display partition exceeds the preset brightness threshold. When the predetermined brightness change value of each display partition does not exceed the preset brightness threshold, the human eye cannot actually perceive the flicker problem, and the initialization voltage Vref may not be compensated.

[0065] Specifically, when it is necessary to compensate the initialization voltage, the compensation value of the initialization voltage Vref required for each display partition can be determined according to the predetermined brightness change value of each display partition; accordingly, during the frequency switching process, when scanning to any display partition, the initialization voltage can be compensated according to the compensation value of the initialization voltage Vref of the display partition, so that the compensated initialization voltage Vref can be written into the sub-pixel 20 in the display partition, so that the sub-pixel 20 in the display partition can be initialized with the compensated initialization voltage Vref corresponding to the display partition, so that the actual brightness change of the display partition after compensation is within a range that is imperceptible to the human eye.

[0066] Alternatively, the compensation value of the initialization voltage Vref can be determined by comprehensively considering the predetermined brightness change value of each display partition before and after the frequency switching, so that the compensation value is suitable for improving the brightness change of all display partitions; accordingly, in the frequency switching process, the same compensated initialization voltage Vref can be provided for the sub-pixels 20 of each display partition, so that after compensation, the actual brightness change of each display partition is within the range that is imperceptible to the human eye, thereby solving the frequency switching flicker problem. Specifically, for any display partition, the voltage compensation range of the initialization voltage corresponding to the display partition can be determined according to the predetermined brightness change value of the display partition; the voltage compensation range of the initialization voltage corresponding to each display partition is taken to intersect, and the voltage compensation range of the initialization voltage corresponding to the display panel can be obtained, and then any voltage value in the voltage compensation range of the initialization voltage corresponding to the display panel can be selected as the compensation value, so that the compensation value takes into account the brightness compensation effect of all display partitions.

[0067] The driving method of the display panel provided by the embodiment of the present invention dynamically sets the initialization voltage in the partitioned multi-frequency display mode. When the frequency switching of at least one display partition causes a flickering problem, the compensation value of the initialization voltage is adjusted by taking into account the predetermined brightness change value of each display partition before and after the frequency switching, thereby compensating for the brightness change of each display partition caused by the frequency switching of at least one display partition, so that the actual brightness change of each display partition before and after the frequency switching is less than the preset brightness threshold, thereby solving the frequency switching flicker problem of the display panel in the partitioned multi-frequency display.

[0068] Based on the above embodiments, optionally, all sub-pixels in the display panel are connected to the same initialization voltage. Accordingly, before the above S130, the method further includes:

[0069] Determine whether the following conditions are met: the predetermined brightness change values ​​of all display partitions exceed the preset brightness threshold, and the brightness change trend is consistent; if so, determine the compensation value of the initialization voltage in the process of controlling the frequency switching of the corresponding display partition according to the frequency cutting instruction according to the predetermined brightness change value of each display partition, and compensate the initialization voltage according to the compensation value; if not, do not compensate the initialization voltage.

[0070] Among them, the brightness change values ​​of all display partitions before and after the frequency switching exceed the preset brightness threshold, and the brightness change trend is consistent, that is, when the corresponding display partition is controlled to switch the frequency according to the frequency cutting instruction, all display partitions will have brightness changes that are perceptible to the human eye in the same direction, that is, the flickering phenomenon of the whole screen becoming brighter or darker will be caused. In this case, the initialization voltage Vref is compensated, specifically, it can be to take into account the brightness change of each display partition and provide a uniform compensation value for the initialization voltage Vref; when the above conditions are not met, the initialization voltage Vref may not be compensated. In this way, it is helpful to simplify the control logic when the initialization voltage Vref is a global signal, and there is no need to provide different initialization voltages Vref in the scanning stage of different display partitions in a display frame. In summary, when the initialization voltage Vref is a global signal, and at least part of the display partitions cut the frequency, causing the whole screen to become brighter / darker, the flickering problem caused by the above-mentioned frequency cutting can be effectively solved by uniformly compensating the initialization voltage Vref.

[0071] On the basis of the above-mentioned embodiments, optionally, for frequency switching within different frequency ranges, the corresponding brightness changes are different. Accordingly, the time node for compensating the initialization voltage can be determined according to the brightness change, that is, the effective time of the compensation value can be dynamically set to achieve better display effects.

[0072] Specifically, the process of controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction includes a transition stage and a steady-state stage that occur in sequence. Among them, in the transition stage, each display partition that needs to switch the frequency is adjusted from the frequency before the switch to the frequency after the switch; in the steady-state stage, each display partition that needs to switch the frequency maintains the frequency after the switch. Correspondingly, the predetermined brightness change value of any display partition before and after the frequency switch includes: the first brightness change value of the display partition in the transition stage compared to the first brightness change value before the frequency switch, and the second brightness change value of the display partition in the steady-state stage compared to the transition stage. It should be noted that the brightness change value of the display partition in any stage can be considered as the difference between the lowest brightness value and the highest brightness value of the display partition that can be detected by the human eye in that stage.

[0073] Then, the above S130 specifically includes:

[0074] If the first brightness change values ​​of all display partitions in the transition stage compared to before the frequency switching exceed the preset brightness threshold, and the brightness change trends are consistent, then from the beginning of the transition stage, the first compensation value of the initialization voltage is determined according to the first brightness change value of each display partition, and the initialization voltage before the frequency switching is compensated according to the first compensation value, so that the actual brightness change of each display partition in the transition stage compared to before the frequency switching is less than the preset brightness threshold.

[0075] And / or, if the second brightness change values ​​of all display partitions in the steady state stage compared to the transition stage exceed the preset brightness threshold, and the brightness change trends are consistent, then from the start of the steady state stage, the second compensation value of the initialization voltage is determined according to the second brightness change value of each display partition, and the initialization voltage in the transition stage is compensated according to the second compensation value, so that the actual brightness change of each display partition in the steady state stage compared to the transition stage is less than the preset brightness threshold. It can be understood that, according to the brightness change of each display partition in the transition stage, if the initialization voltage is compensated in the transition stage, the initialization voltage in the transition stage is the initialization voltage after the compensation in the transition stage, and if the initialization voltage is not compensated in the transition stage, the initialization voltage in the transition stage is the initialization voltage before the frequency switching.

[0076] In an embodiment of the present invention, in a partitioned multi-frequency display mode, different compensation voltage effective time nodes are set for different time points of flicker changes. By flexibly adjusting the compensation time of the initialization voltage, the flicker in different frequency switching situations can be improved in a targeted manner to enhance the display effect.

[0077] Based on the above-mentioned embodiments, optionally, the transition stage includes: starting to control the corresponding display partition to perform frequency switching according to the frequency cutting instruction, and each display frame between the first full refresh frame and the second full refresh frame; wherein the full refresh frame is a display frame in which data is written to sub-pixels in all display partitions.

[0078] Specifically, in the partitioned multi-frequency display mode, each display frame of the display panel can be divided into two categories: full refresh frames and non-full refresh frames. In the full refresh frame, in the scanning stage of each display partition, each sub-pixel of the corresponding display partition writes data to achieve data refresh. In the non-full refresh frame, in the scanning stage of some or all display partitions, each sub-pixel of the corresponding display partition does not write data, and the data is retained. Among them, a display frame of the display panel may include a scanning stage corresponding to each display partition one by one. For any sub-pixel, its driving process in a display frame includes: a non-luminous stage and a luminous stage; in the non-luminous stage, the sub-pixel can be initialized and data written. The scanning stage of a display partition may include a time period starting from the start time of the non-luminous stage of the first row of sub-pixels in the display partition to the end time of the non-luminous stage of the last row of sub-pixels in the display partition.

[0079] On the basis of the above-mentioned embodiments, the inventor has verified through experiments that when the display partitions perform frequency switching in different ranges, the brightness change period and brightness change direction of each display partition are not the same. Specifically, if the display partition that needs to perform frequency switching performs frequency switching between the first frequency range and the second frequency range, then in the transition stage, the first brightness change value of all display partitions in the transition stage compared to before the frequency switching will exceed the preset brightness threshold, and the brightness change trend is consistent, and in the steady-state stage, only some display partitions exceed the preset brightness threshold in the steady-state stage compared to the second brightness change value in the transition stage. If the display partition that needs to perform frequency switching performs frequency switching between the third frequency range and the fourth frequency range, then in the transition stage, the first brightness change value of all display partitions in the transition stage compared to before the frequency switching does not exceed the preset brightness threshold, and in the steady-state stage, the second brightness change value of all display partitions in the steady-state stage compared to the transition stage exceeds the preset brightness threshold. Among them, the frequency lower limit value in the first frequency range is greater than the frequency upper limit value in the second frequency range, the frequency upper limit value in the third frequency range is less than or equal to the frequency upper limit value in the second frequency range, the frequency lower limit value in the third frequency range is less than or equal to the frequency lower limit value in the second frequency range, and the frequency lower limit value in the third frequency range is greater than or equal to the frequency upper limit value in the fourth frequency range. That is to say, the frequency in the first frequency range, the frequency in the second frequency range, and the frequency in the fourth frequency range decrease in sequence, and the third frequency range may include the second frequency range.

[0080] Therefore, the above S130 specifically includes:

[0081] If the display partitions that need to perform frequency switching specified in the frequency cutting instruction all perform frequency switching between the first frequency range and the second frequency range, and the frequency change trends are consistent (for example, all are up-frequency or down-frequency), then from the beginning of the transition phase, the first compensation value of the initialization voltage is determined according to the first brightness change value of each display partition, and the initialization voltage before the frequency switching is compensated according to the first compensation value, and the same initialization voltage as in the transition phase is maintained in the steady-state phase. In this way, corresponding to the brightness change characteristics of the display partition performing frequency switching between the first frequency range and the second frequency range, the initialization voltage compensation can be started in the transition phase, and the initialization voltage can be maintained in the steady-state phase.

[0082] If each display partition that needs to perform frequency switching specified in the frequency cutting instruction performs frequency switching between the third frequency range and the fourth frequency range, the initialization voltage before the frequency switching is maintained in the transition stage, and the second compensation value of the initialization voltage is determined according to the second brightness change value of each display partition from the beginning of the steady-state stage, and the initialization voltage in the transition stage is compensated according to the second compensation value. In this way, corresponding to the brightness change characteristics of the display partition performing frequency switching between the third frequency range and the fourth frequency range, the initialization voltage compensation is not performed in the transition stage, and the initialization voltage compensation is started in the steady-state stage.

[0083] It can be understood that, for each display partition that needs to switch the frequency specified in the frequency cutting instruction, the compensation direction of the initialization voltage is opposite to that of the initialization voltage when the frequency is reduced and when the frequency is increased. If the compensation value in the case of reducing the frequency is positive, the compensation value in the case of increasing the frequency is negative; conversely, if the compensation value in the case of reducing the frequency is negative, the compensation value in the case of increasing the frequency is positive.

[0084] It should be noted that for other frequency switching situations, such as frequency switching within the first frequency range, since the frequency cutting action itself does not cause all display partitions to have a consistent brightness change trend and the brightness changes do not exceed the preset brightness threshold, that is, it will not cause full-screen flickering, there is no need to compensate for the initialization voltage during the frequency cutting process.

[0085] Based on the above implementations, optionally, each frequency within the first frequency range, each frequency within the second frequency range, each frequency within the third frequency range, and each frequency within the fourth frequency range can be divided by the reference frequency; the reference frequency is a positive integer multiple of the upper frequency limit value within the first frequency range.

[0086] That is, in the embodiment of the present invention, the refresh frequency of each display partition can be adjusted by inserting frames. For any display partition, the display frame in which the sub-pixels therein refresh data during the scanning phase is a refresh frame for the display partition, and the display frame in which the sub-pixels therein retain data during the scanning phase is a retain frame for the display partition. For any display partition, the lower its refresh frequency, the greater the number of retain frames between two adjacent refresh frames of the display partition. For the entire display panel, when the refresh frequency of each display partition remains unchanged, the display process of the display panel may include multiple display cycles, and each display cycle may include: display frames from a full refresh frame to the next full refresh frame. The lower the refresh frequency of the display partition with the lowest refresh frequency, the greater the number of non-full refresh frames included in a display cycle.

[0087] In the full refresh frame, the frequency control signal SW maintains the first voltage, and controls each scanning signal Scan output by the scanning circuit 100 to have a pulse, so that all sub-pixels 20 in the display panel are written with data, and the sub-pixels 20 in each display partition are refreshed with data. In the non-full refresh frame, the frequency control signal SW can maintain the first voltage during the scanning phase of the display partition being refreshed, so that each scanning signal Scan connected to the display partition has a pulse in the display frame, and the frequency control signal SW can maintain the second voltage during the scanning phase of the display partition being maintained, so that each scanning signal Scan connected to the display partition has no pulse in the display frame and presents a DC state; the first voltage is different from the second voltage. The reference frequency is the highest frequency of the scanning signal Scan that the scanning circuit 10 can output. In the frequency adjustment mode of the interpolated frame, the refresh frequencies supported by each display partition are all frequencies that can divide the reference frequency.

[0088] Exemplarily, the reference frequency is 360 Hz, the first frequency range includes: frequencies from 60 Hz to 120 Hz that are evenly divisible by 360 Hz, the second frequency range includes: 30 Hz, the third frequency range includes: frequencies from 10 Hz to 30 Hz that are evenly divisible by 360 Hz, and the fourth frequency range includes: frequencies from 1 Hz to 10 Hz that are evenly divisible by 360 Hz.

[0089] The initialization voltage compensation process under different frequency cutting conditions is described below in conjunction with some specific embodiments, but this is not intended to limit the present invention.

[0090] See also Figure 3 , with the display panel as Figure 2 Take the upper, middle and lower three partitions in as an example, Figure 3Five partitioned multi-frequency display modes are given, which are the first display mode MOD1, the second display mode MOD2, the third display mode MOD3, the fourth display mode MOD4 and the fifth display mode MOD5 from left to right, and the brightness change of each display partition when switching from each display mode to the next display mode is given. Among them, in each display mode, the refresh frequency of the first display partition A1 and the third display partition A3 is maintained at 1Hz, and from the first display mode MOD1 to the fifth display mode MOD5, the refresh frequency of the second display partition A2 is: 120Hz, 60Hz, 30Hz, 10Hz and 1Hz respectively. It should be noted that for any display partition, the brightness fluctuation within a display mode does not reach the range that can be perceived by the human eye.

[0091] See also Figure 3 , when the refresh rate of the second display partition A2 is switched from 120Hz to 60Hz, the display partition that needs to switch the frequency can switch the frequency within the first frequency range. In this case, there is no brightness change in the three display partitions, so there is no need to adjust the initialization voltage during the frequency switching process.

[0092] For the case where the refresh rate of the second display partition A2 is switched from 60Hz to 30Hz, the corresponding display partition that needs to perform frequency switching can perform frequency switching between the first frequency range and the second frequency range. In this case, the brightness of the second display partition A2 will increase in the transition stage Ttra; the brightness in the steady state stage Tste is consistent with that in the transition stage Ttra, and the brightness is also increased compared to the second display mode. The first display partition A1 and the third display partition A3 first increase the brightness in the transition stage Ttra, and then drop the brightness in the steady state stage Tste to restore to the brightness in the second display mode. The initialization voltage adjustment method in this case can be found in Figure 4 , Figure 4 In the figure, a display frame F is between two adjacent dotted lines, and a display cycle includes 120 display frames (i.e., 120F). The transition stage Ttra is the first display cycle after the frequency switching starts, and the subsequent display cycles belong to the steady-state stage Tste. The first voltage of the frequency control signal SW is a high voltage, and the second voltage is a low voltage. The shaded filling indicates that the display partition performs data refresh, and the blank filling indicates that the display partition performs data retention. The full refresh frame is marked as FA. In the second display mode MOD2, the second display partition A2 performs data refresh every two display frames. In the third display mode MOD3, the second display partition A2 performs data refresh every four display frames. See Figure 4, from the beginning of the transition phase Ttra, the initialization voltage Vref before the frequency switching is compensated according to the first compensation value, and the brightness reduction correction is performed for the brightness increase (brightness) of each display partition in the transition phase Ttra; the exemplary first compensation value here is a negative value, and the magnitude range of the first compensation value is, for example, 1-20mV. And, in the steady-state phase Tste, the initialization voltage Vref maintains the same voltage value as in the transition phase Ttra.

[0093] When the refresh rate of the second display partition A2 is switched from 30Hz to 10Hz, the display partition that needs to switch the frequency may switch the frequency between the third frequency range and the fourth frequency range. In this case, the brightness of the three display partitions will drop. Specifically, the brightness of the three display partitions in the transition stage remains the brightness of the third display mode, and the brightness in the steady state stage drops to the brightness of the fourth display mode. The initialization voltage adjustment method in this case can be found in Figure 5 , Figure 5 In the third display mode MOD3, the second display partition A2 performs data refresh every four display frames, and in the fourth display mode MOD4, the second display partition A2 performs data refresh every twelve display frames (12F). Figure 5 , the initialization voltage Vref maintains the voltage value before the frequency switching in the transition stage Ttra to avoid unnecessary brightness fluctuation caused by the change of the initialization voltage Vref in the transition stage Ttra; from the beginning of the steady-state stage Tste, the initialization voltage Vref in the transition stage Ttra is compensated according to the second compensation value, and the brightness drop (darkness) of each display partition in the steady-state stage Tste is corrected by brightness increase; the exemplary second compensation value here is a positive value, and the size range of the second compensation value is, for example, 1-20mV.

[0094] For the case where the refresh frequency of the second display partition A2 is switched from 10 Hz to 1 Hz, the display partition that needs to perform frequency switching can still perform frequency switching between the third frequency range and the fourth frequency range, which is similar to the initialization voltage adjustment method when the refresh frequency of the second display partition A2 is switched from 30 Hz to 10 Hz, and will not be repeated here.

[0095] On the basis of the above-mentioned embodiments, optionally, in the case where the frequency switching instruction is an instruction for controlling at least two display partitions to switch frequencies, the specific acquisition process of the first brightness change value and the second brightness change value includes: for any target display partition, before and after the frequency switching of each display partition that switches frequencies according to the frequency switching instruction, the brightness change value of the target display partition in the transition phase compared to that before the frequency switching is superimposed as the first brightness change value of the target display partition. For any target display partition, after the frequency switching of each display partition that switches frequencies according to the frequency switching instruction, the brightness change value of the target display partition in the steady-state phase compared to that in the transition phase is superimposed as the second brightness change value of the target display partition.

[0096] The driver chip can pre-store the brightness change values ​​of all display partitions in the transition stage and the steady-state stage after any display partition performs any frequency switching; and after obtaining the frequency cutting instruction, search the stored information to obtain each first brightness change value and each second brightness change value.

[0097] Specifically, for any target display partition, the display partitions that need to be frequency switched and the frequencies after switching can be determined according to the frequency switching instruction; then, the brightness change value of the target display partition in the transition phase compared to before the frequency switching is obtained when only one of the display partitions is controlled to switch the frequency; then, the brightness change values ​​obtained above are superimposed as the first brightness change value. And, the brightness change value of the target display partition in the steady state phase compared to the transition phase is obtained when only one of the display partitions is controlled to switch the frequency; then, the brightness change values ​​obtained above are superimposed as the second brightness change value. For example, taking the process of obtaining the first brightness change value as an example, assuming that the display panel includes three display partitions, among which the first display partition and the second display partition both need to perform frequency switching, and the third display partition is the target display partition, the process of obtaining the first brightness change value of the third display partition includes: obtaining the brightness change value of the third display partition in the transition stage compared to before the frequency switching when only the first display partition is controlled to perform frequency switching, and obtaining the brightness change value of the third display partition in the transition stage compared to before the frequency switching when only the second display partition is controlled to perform frequency switching; the first brightness change value of the third display partition can be obtained by superimposing the brightness change values ​​in the above two cases.

[0098] On the basis of the above embodiments, optionally, determining the first compensation value of the initialization voltage according to the first brightness change value of each display partition includes: for any display partition, determining the first voltage compensation range of the initialization voltage corresponding to the display partition according to the first brightness change value of the display partition; taking the intersection of each first voltage compensation range to obtain the second voltage compensation range of the initialization voltage corresponding to the display panel, and selecting any voltage value in the second voltage compensation range as the first compensation value. In this way, the first compensation value can take into account the brightness compensation effect of all display partitions in the transition stage.

[0099] Among them, the first voltage compensation range of any display partition is a voltage range that can make the actual brightness change of the display partition in the transition stage compared to before the frequency switching be less than the preset brightness threshold. That is, the first compensation value is any voltage value within the first voltage compensation range of the display partition, which can achieve the effect of making the actual brightness change of the display partition in the transition stage compared to before the frequency switching be less than the preset brightness threshold, thereby improving the flicker of the display partition in the transition stage. Exemplarily, taking the display panel including three display partitions as an example, the process of determining the first compensation value is: according to the first brightness change value of the first display partition, determine the first voltage compensation range of the initialization voltage corresponding to the first display partition, for example, 5-15mV; according to the first brightness change value of the second display partition, determine the first voltage compensation range of the initialization voltage corresponding to the second display partition, for example, 8-17mV; according to the first brightness change value of the third display partition, determine the first voltage compensation range of the initialization voltage corresponding to the third display partition, for example, 3-10mV; take the intersection of the above three first voltage compensation ranges as the second voltage compensation range, specifically 8-10mV; then, any voltage value in 8-10mV can be used as the final first compensation value, for example, 9mV is selected as the first compensation value.

[0100] Determining the second compensation value of the initialization voltage according to the second brightness change value of each display partition includes: for any display partition, determining the third voltage compensation range of the initialization voltage corresponding to the display partition according to the second brightness change value of the display partition; taking the intersection of each third voltage compensation range to obtain the fourth voltage compensation range of the initialization voltage corresponding to the display panel, and selecting any voltage value in the fourth voltage compensation range as the second compensation value. In this way, the second compensation value can take into account the brightness compensation effect of all display partitions in the steady state stage.

[0101] Among them, the third voltage compensation range of any display partition is a voltage range that can make the actual brightness change of the display partition in the steady state stage compared to the transition stage less than the preset brightness threshold, that is, the second compensation value selects any voltage value within the second voltage compensation range of the display partition, which can achieve the effect of making the actual brightness change of the display partition in the steady state stage compared to the transition stage less than the preset brightness threshold, thereby improving the flicker of the display partition in the steady state stage.

[0102] The compensation value of the initialization voltage and its effective time are explained by way of example in the above-mentioned embodiments. The specific action position of the initialization voltage is explained by way of example in combination with the specific structure of the sub-pixel.

[0103] Figure 6 is a schematic diagram of a sub-pixel structure provided by an embodiment of the present invention. Figure 6 The sub-pixel 20 includes: a pixel circuit and a light-emitting device OLED. The pixel circuit includes: a driving transistor M1, a data writing transistor M2, a threshold compensation transistor M3, a first light-emitting control transistor M5, a second light-emitting control transistor M6, a first initialization transistor M4, a second initialization transistor M7 and a third initialization transistor M8.

[0104] Among them, the first light-emitting control transistor M5, the driving transistor M1, the second light-emitting control transistor M6 and the light-emitting device OLED are connected in series in sequence, for example, they are connected in series between the first power line and the second power line, the first power line is used to provide the first power signal VDD, and the second power line is used to provide the second power signal VSS; the gate of the first light-emitting control transistor M5 and the gate of the second light-emitting control transistor M6 are both connected to the light-emitting control signal EM. The data writing transistor M2 is connected to the first electrode of the driving transistor M1, and is connected to the first scanning signal SP1 and the data voltage Vdata. The threshold compensation transistor M3 is connected between the gate and the second electrode of the driving transistor M1, and is connected to the second scanning signal SN2; Figure 2 The scan signal Scan shown in is, for example, the second scan signal SN2. The first initialization transistor M4 and the second initialization transistor M8 are both connected to the second electrode of the driving transistor M1, the first initialization transistor M4 is also connected to the first initialization voltage Vrefn1 and the third scan signal SN1, and the second initialization transistor M8 is also connected to the second initialization voltage Vrefp and the fourth scan signal SP2. The third initialization transistor M7 is connected to the anode of the light-emitting device OLED, and is connected to the third initialization voltage Vrefn2 and the fourth scan signal SP2. And, the pixel circuit may also include: a storage capacitor Cst, connected to the gate of the driving transistor M1, and connected to the first power supply signal VDD.

[0105] The initialization voltage can be provided to the first initialization transistor M4, the second initialization transistor M8 or the third initialization transistor M7; that is, the initialization voltage can be used as the first initialization voltage Vrefn1, the second initialization voltage Vrefp or the third initialization voltage Vrefn2. Each initialization voltage can be dynamically adjusted using the method provided by any embodiment of the present invention. The compensation values ​​of each initialization voltage under different frequency switching conditions are described below.

[0106] In one embodiment, optionally, the initialization voltage is provided to the third initialization transistor M7 as the third initialization voltage Vrefn2. Then, if the brightness of all display partitions increases after the frequency switching, the compensation value is a negative value; if the brightness of all display partitions decreases after the frequency switching, the compensation value is a positive value.

[0107] Specifically, if all display partitions that need to perform frequency switching specified in the frequency cutting instruction are switched from the frequency in the first frequency range to the frequency in the second frequency range, the first compensation value is a negative value; if all display partitions that need to perform frequency switching specified in the frequency cutting instruction are switched from the frequency in the second frequency range to the frequency in the first frequency range, the first compensation value is a positive value; if all display partitions that need to perform frequency switching specified in the frequency cutting instruction are switched from the frequency in the third frequency range to the frequency in the fourth frequency range, the first compensation value is a positive value; if all display partitions that need to perform frequency switching specified in the frequency cutting instruction are switched from the frequency in the fourth frequency range to the frequency in the third frequency range, the first compensation value is a negative value.

[0108] In another embodiment, optionally, the initialization voltage is provided to the first initialization transistor M4 or the second initialization transistor M8 as the first initialization voltage Vrefn1 or the second initialization voltage Vrefp; and the driving transistor M1 is a P-type transistor. Then, if the brightness of all display partitions increases after the frequency switching, the compensation value is a positive value; if the brightness of all display partitions decreases after the frequency switching, the compensation value is a negative value.

[0109] Specifically, if all display partitions that need to perform frequency switching specified in the frequency cutting instruction are switched from the frequency in the first frequency range to the frequency in the second frequency range, the first compensation value is a positive value; if all display partitions that need to perform frequency switching specified in the frequency cutting instruction are switched from the frequency in the second frequency range to the frequency in the first frequency range, the first compensation value is a negative value; if all display partitions that need to perform frequency switching specified in the frequency cutting instruction are switched from the frequency in the third frequency range to the frequency in the fourth frequency range, the first compensation value is a negative value; if all display partitions that need to perform frequency switching specified in the frequency cutting instruction are switched from the frequency in the fourth frequency range to the frequency in the third frequency range, the first compensation value is a positive value.

[0110] An embodiment of the present invention further provides a display panel driving device, which is used to execute the display panel driving method provided by any embodiment of the present invention, and has corresponding beneficial effects. Figure 7 is a schematic diagram of the structure of a driving device for a display panel provided by an embodiment of the present invention. Figure 7 The driving device of the display panel includes: an instruction acquisition module 310, a brightness change acquisition module 320 and a frequency cutting control module 330.

[0111] The instruction acquisition module 310 is used to acquire a frequency switching instruction when the display panel displays at least two display partitions with different refresh frequencies; wherein the frequency switching instruction is an instruction to control at least one display partition to switch the frequency. The brightness change acquisition module 320 is used to acquire the predetermined brightness change value of each display partition before and after the frequency switching if the corresponding display partition is controlled to switch the frequency according to the frequency switching instruction. The frequency cutting control module 330 is used to determine the compensation value of the initialization voltage in the process of controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction according to the predetermined brightness change value of each display partition, and compensate the initialization voltage according to the compensation value, so that the actual brightness change of each display partition before and after the frequency switching is less than the preset brightness threshold; wherein the initialization voltage is provided to the sub-pixels in the display panel.

[0112] On the basis of the above-mentioned embodiments, optionally, the driving device of the display panel also includes: a judgment module; the judgment module is used for the frequency cutting control module 330 to determine the compensation value of the initialization voltage in the process of controlling the corresponding display partition to perform frequency switching according to the frequency cutting instruction according to the predetermined brightness change value of each display partition, and before compensating the initialization voltage according to the compensation value, to judge whether the following conditions are met: the predetermined brightness change values ​​of all display partitions exceed the preset brightness threshold, and the brightness change trends are consistent; if so, the frequency cutting control module 330 is controlled to determine the compensation value of the initialization voltage in the process of controlling the corresponding display partition to perform frequency switching according to the frequency cutting instruction according to the predetermined brightness change value of each display partition, and compensate the initialization voltage according to the compensation value; if not, the frequency cutting control module 330 is controlled not to compensate the initialization voltage.

[0113] On the basis of the above-mentioned embodiments, optionally, the frequency cutting control module 330 is specifically used for: if the first brightness change values ​​of all display partitions in the transition stage compared with the first brightness change values ​​before the frequency switching exceed the preset brightness threshold, and the brightness change trends are consistent, then from the beginning of the transition stage, the first compensation value of the initialization voltage is determined according to the first brightness change value of each display partition, and the initialization voltage before the frequency switching is compensated according to the first compensation value, so that the actual brightness change of each display partition in the transition stage compared with the frequency switching is less than the preset brightness threshold; and / or, if the second brightness change values ​​of all display partitions in the steady-state stage compared with the transition stage exceed the preset brightness threshold, and the brightness change trends are consistent, then from the beginning of the steady-state stage, the second compensation value of the initialization voltage is determined according to the second brightness change value of each display partition, and the initialization voltage in the transition stage is compensated according to the second compensation value, so that the actual brightness change of each display partition in the steady-state stage compared with the transition stage is less than the preset brightness threshold.

[0114] On the basis of the above-mentioned embodiments, optionally, the frequency cutting control module 330 is specifically used for: if the display partitions that need to perform frequency switching specified in the frequency cutting instruction perform frequency switching between the first frequency range and the second frequency range, and the frequency change trend is consistent, then from the start time of the transition stage, the first compensation value of the initialization voltage is determined according to the first brightness change value of each display partition, and the initialization voltage before the frequency switching is compensated according to the first compensation value, and the same initialization voltage as that in the transition stage is maintained in the steady-state stage; wherein the lower frequency limit value in the first frequency range is greater than the upper frequency limit value in the second frequency range; if the display partitions that need to perform frequency switching specified in the frequency cutting instruction perform frequency switching between the third frequency range and the fourth frequency range, and the frequency change trend is consistent, then the initialization voltage before the frequency switching is maintained in the transition stage, and from the start time of the steady-state stage, the second compensation value of the initialization voltage is determined according to the second brightness change value of each display partition, and the initialization voltage in the transition stage is compensated according to the second compensation value; wherein the upper frequency limit value in the third frequency range is less than or equal to the upper frequency limit value in the second frequency range, and the lower frequency limit value in the third frequency range is greater than or equal to the upper frequency limit value in the fourth frequency range.

[0115] On the basis of the above-mentioned embodiments, optionally, in the case where the frequency switching instruction is an instruction for controlling at least two display partitions to perform frequency switching, the brightness change acquisition module 320 is specifically used to: for any target display partition, before and after the frequency switching of each display partition that performs frequency switching according to the frequency switching instruction, the brightness change value of the target display partition in the transition phase compared to that before the frequency switching is superimposed as the first brightness change value of the target display partition; for any target display partition, after the frequency switching of each display partition that performs frequency switching according to the frequency switching instruction, the brightness change value of the target display partition in the steady-state phase compared to that in the transition phase is superimposed as the second brightness change value of the target display partition.

[0116] On the basis of the above-mentioned embodiments, the frequency cutting control module 330 is optionally used to: when determining the first compensation value of the initialization voltage according to the first brightness change value of each display partition, for any display partition, determine the first voltage compensation range of the initialization voltage corresponding to the display partition according to the first brightness change value of the display partition; take the intersection of each first voltage compensation range to obtain the second voltage compensation range of the initialization voltage corresponding to the display panel, and select any voltage value in the second voltage compensation range as the first compensation value. When determining the second compensation value of the initialization voltage according to the second brightness change value of each display partition, for any display partition, determine the third voltage compensation range of the initialization voltage corresponding to the display partition according to the second brightness change value of the display partition; take the intersection of each third voltage compensation range to obtain the fourth voltage compensation range of the initialization voltage corresponding to the display panel, and select any voltage value in the fourth voltage compensation range as the second compensation value.

[0117] An embodiment of the present invention further provides a display device, which can apply the display panel driving method provided by any embodiment of the present invention to drive the display panel, and has corresponding beneficial effects. Figure 8 is a schematic diagram of the structure of a display device provided by an embodiment of the present invention. Figure 8 The display device includes: a display panel 100 and a driving chip 200, wherein the driving chip 200 is used to execute a driving method of the display panel, and the driving chip 200 can parse a frequency cutting instruction SF and adjust a frequency control signal SW and an initialization voltage Vref according to the frequency cutting instruction SF. Exemplarily, the driving device of the display panel provided in any embodiment of the present invention can be integrated into the driving chip 200.

[0118] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0119] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for driving a display panel, characterized in that: include: When the display panel is displayed in at least two display partitions with different refresh frequencies, a frequency switching instruction is obtained; wherein the frequency switching instruction is an instruction for controlling at least one of the display partitions to switch the frequency; Obtaining a predetermined brightness change value of each display partition before and after the frequency switching if the corresponding display partition is controlled to switch the frequency according to the frequency switching instruction; According to the predetermined brightness change value of each of the display partitions, a compensation value of the initialization voltage in the process of controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction is determined, and the initialization voltage is compensated according to the compensation value so that the actual brightness change of each of the display partitions before and after the frequency switching is less than a preset brightness threshold; wherein the initialization voltage is provided to the sub-pixels in the display panel.

2. The method for driving a display panel according to claim 1, wherein: All the sub-pixels in the display panel are connected to the same initialization voltage; before determining, according to the predetermined brightness change value of each display partition, a compensation value of the initialization voltage in the process of controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction, and compensating the initialization voltage according to the compensation value, the method further includes: Determine whether the following conditions are met: the predetermined brightness change values ​​of all the display partitions exceed the preset brightness threshold, and the brightness change trends are consistent; If yes, determining a compensation value of the initialization voltage in the process of controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction according to the predetermined brightness change value of each display partition, and compensating the initialization voltage according to the compensation value; If not, the initialization voltage is not compensated.

3. The method for driving a display panel according to claim 1 or 2, characterized in that: The process of controlling the corresponding display partition to switch the frequency according to the frequency switching instruction includes a transition phase and a steady-state phase that occur in sequence; wherein, in the transition phase, each of the display partitions that need to switch the frequency is adjusted from the frequency before the switching to the frequency after the switching; in the steady-state phase, each of the display partitions that need to switch the frequency maintains the frequency after the switching; the predetermined brightness change value of any display partition before and after the frequency switching includes: a first brightness change value of the display partition in the transition phase compared to the first brightness change value before the frequency switching, and a second brightness change value of the display partition in the steady-state phase compared to the transition phase; According to the predetermined brightness change value of each display partition, determining a compensation value of an initialization voltage in a process of controlling the corresponding display partition to switch the frequency according to the frequency cutting instruction, and compensating the initialization voltage according to the compensation value, including: If the first brightness change values ​​of all the display partitions in the transition stage compared to before the frequency switching exceed the preset brightness threshold, and the brightness change trends are consistent, then from the start time of the transition stage, the first compensation value of the initialization voltage is determined according to the first brightness change value of each of the display partitions, and the initialization voltage before the frequency switching is compensated according to the first compensation value, so that the actual brightness change of each of the display partitions in the transition stage compared to before the frequency switching is less than the preset brightness threshold; And / or, if the second brightness change values ​​of all the display partitions in the steady state stage compared to the transition stage exceed the preset brightness threshold, and the brightness change trends are consistent, then from the start time of the steady state stage, the second compensation value of the initialization voltage is determined according to the second brightness change value of each of the display partitions, and the initialization voltage in the transition stage is compensated according to the second compensation value, so that the actual brightness change of each of the display partitions in the steady state stage compared to the transition stage is less than the preset brightness threshold; Preferably, the transition stage includes: starting to control the corresponding display partition to perform frequency switching according to the frequency cutting instruction, and each display frame between the first full refresh frame and the second full refresh frame; wherein the full refresh frame is a display frame in which data is written to all sub-pixels in the display partition.

4. The method for driving a display panel according to claim 3, wherein: If the display partitions that need to perform frequency switching specified in the frequency cutting instruction perform frequency switching between the first frequency range and the second frequency range, and the frequency change trends are consistent, then from the start time of the transition stage, the first compensation value of the initialization voltage is determined according to the first brightness change value of each display partition, and the initialization voltage before the frequency switching is compensated according to the first compensation value, and the same initialization voltage as that in the transition stage is maintained in the steady-state stage; wherein the frequency lower limit value in the first frequency range is greater than the frequency upper limit value in the second frequency range; If the display partitions that need to perform frequency switching specified in the frequency cutting instruction all perform frequency switching between the third frequency range and the fourth frequency range, and the frequency change trends are consistent, then the initialization voltage before the frequency switching is maintained in the transition stage, and from the beginning of the steady-state stage, the second compensation value of the initialization voltage is determined according to the second brightness change value of each display partition, and the initialization voltage in the transition stage is compensated according to the second compensation value; wherein the upper frequency limit value in the third frequency range is less than or equal to the upper frequency limit value in the second frequency range, and the lower frequency limit value in the third frequency range is greater than or equal to the upper frequency limit value in the fourth frequency range.

5. The method for driving a display panel according to claim 4, characterized in that: Each frequency within the first frequency range, each frequency within the second frequency range, each frequency within the third frequency range, and each frequency within the fourth frequency range can divide the reference frequency; The reference frequency is a positive integer multiple of the upper frequency limit within the first frequency range; Preferably, the reference frequency is 360 Hz, the first frequency range includes: frequencies from 60 Hz to 120 Hz that are evenly divisible by 360 Hz, the second frequency range includes: 30 Hz, the third frequency range includes: frequencies from 10 Hz to 30 Hz that are evenly divisible by 360 Hz, and the fourth frequency range includes: frequencies from 1 Hz to 10 Hz that are evenly divisible by 360 Hz.

6. The method for driving a display panel according to claim 3, wherein: The frequency switching instruction is an instruction for controlling at least two display partitions to switch frequencies; the obtaining of the predetermined brightness change value of each display partition before and after the frequency switching if the corresponding display partition is controlled to switch frequencies according to the frequency switching instruction includes: For any target display partition, before and after the frequency switching of each display partition that performs frequency switching according to the frequency switching instruction, the brightness change value of the target display partition in the transition phase compared with that before the frequency switching is superimposed as the first brightness change value of the target display partition; For any target display partition, after the frequency switching of each display partition that performs frequency switching according to the frequency cutting instruction, the brightness change value of the target display partition in the steady state stage compared with that in the transition stage is superimposed as the second brightness change value of the target display partition.

7. The method for driving a display panel according to claim 3, wherein: Determining a first compensation value of the initialization voltage according to the first brightness change value of each of the display partitions includes: For any of the display partitions, determining a first voltage compensation range of an initialization voltage corresponding to the display partition according to a first brightness change value of the display partition; Taking an intersection of the first voltage compensation ranges to obtain a second voltage compensation range of the initialization voltage corresponding to the display panel, and selecting any voltage value in the second voltage compensation range as the first compensation value; Determining a second compensation value of the initialization voltage according to the second brightness change value of each of the display partitions includes: For any of the display partitions, determining a third voltage compensation range of the initialization voltage corresponding to the display partition according to the second brightness change value of the display partition; An intersection of the third voltage compensation ranges is taken to obtain a fourth voltage compensation range of the initialization voltage corresponding to the display panel, and any voltage value in the fourth voltage compensation range is selected as the second compensation value.

8. The method for driving a display panel according to claim 1 or 2, characterized in that: The sub-pixel comprises: a pixel circuit and a light-emitting device; the pixel circuit comprises: a driving transistor, a data writing transistor, a threshold compensation transistor, a first light-emitting control transistor, a second light-emitting control transistor, a first initialization transistor, a second initialization transistor and a third initialization transistor; the first light-emitting control transistor, the driving transistor, the second light-emitting control transistor and the light-emitting device are sequentially connected in series, the data writing transistor is connected to the first electrode of the driving transistor, the threshold compensation transistor is connected between the gate and the second electrode of the driving transistor, the first initialization transistor and the second initialization transistor are both connected to the second electrode of the driving transistor; the third initialization transistor is connected to the anode of the light-emitting device; The initialization voltage is provided to the first initialization transistor, the second initialization transistor or the third initialization transistor; Preferably, the initialization voltage is provided to the third initialization transistor; if the brightness of all the display partitions increases after the frequency switching, the compensation value is a negative value; if the brightness of all the display partitions decreases after the frequency switching, the compensation value is a positive value; or, The initialization voltage is provided to the first initialization transistor or the second initialization transistor, and the driving transistor is a P-type transistor; if the brightness of all the display partitions increases after the frequency switching, the compensation value is a positive value; if the brightness of all the display partitions decreases after the frequency switching, the compensation value is a negative value.

9. A driving device for a display panel, characterized in that: include: An instruction acquisition module, used to acquire a frequency switching instruction when the display panel displays in at least two display partitions with different refresh frequencies; wherein the frequency switching instruction is an instruction for controlling at least one of the display partitions to switch the frequency; A brightness change acquisition module, used to acquire a predetermined brightness change value of each display partition before and after the frequency switching if the corresponding display partition is controlled to switch the frequency according to the frequency switching instruction; A frequency cutting control module is used to determine, according to a predetermined brightness change value of each display partition, a compensation value of an initialization voltage in the process of controlling the corresponding display partition to perform frequency switching according to the frequency cutting instruction, and compensate the initialization voltage according to the compensation value so that the actual brightness change of each display partition before and after the frequency switching is less than a preset brightness threshold; wherein the initialization voltage is provided to the sub-pixels in the display panel.

10. A display device, characterized in that: include: A display panel and a driving chip, wherein the driving chip is used to execute the display panel driving method described in any one of claims 1 to 8.

Images