Display panel driving method, driving device and display device

Abstract

The present invention discloses a display panel driving method, driving device, and display device. The display panel includes multiple sub-pixels, each of which includes a pixel circuit and a light-emitting unit. The pixel circuit is used to drive the light-emitting unit to emit light; the pixel circuit includes a driving transistor; a driving cycle of the sub-pixel includes a writing phase and a holding phase; the display panel driving method includes: determining the current screen refresh frequency of the display panel; determining a holding voltage of the display panel based on the current screen refresh frequency; wherein different screen refresh frequencies correspond to different holding voltages; and writing the holding voltage to the source of the driving transistor during the holding phase. Embodiments of the present invention can improve the display effect of a display panel.

Description

Technical Field

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

[0002] With the rapid development of display technology, people have higher and higher requirements for the display of display panels. However, existing display panels have the problem of brightness variation during the display process, which affects the display effect of the display panel. Summary of the Invention

[0003] The present invention provides a display panel driving method, a driving device and a display device to improve the display effect of the display panel.

[0004] According to one aspect of the present invention, a method for driving a display panel is provided, wherein the display panel includes a plurality of sub-pixels, each sub-pixel including a pixel circuit and a light-emitting unit, the pixel circuit being configured to drive the light-emitting unit to emit light; the pixel circuit including a driving transistor; and a driving cycle of the sub-pixel including a writing phase and a holding phase.

[0005] The method comprises:

[0006] Determine the current refresh rate of the display panel;

[0007] Determining a holding voltage of the display panel according to the current picture refresh frequency; wherein different picture refresh frequencies correspond to different holding voltages;

[0008] The hold voltage is written to the source of the driving transistor during the hold phase.

[0009] Optionally, before determining the holding voltage of the display panel according to the current picture refresh frequency, the method further includes:

[0010] Determining a current display brightness level of the display panel, wherein different display brightness levels correspond to the same minimum display brightness and different maximum display brightness;

[0011] Determining the holding voltage of the display panel according to the current picture refresh frequency includes:

[0012] The holding voltage is determined according to the current picture refresh frequency and the current display brightness level; wherein, at the same picture refresh frequency, the holding voltages of at least some display brightness levels are different from the holding voltages of other display brightness levels.

[0013] Optionally, at the same screen refresh rate: different display brightness levels have different holding voltages, or different display brightness level ranges have different holding voltages.

[0014] Optionally, the holding phase includes a plurality of holding frames;

[0015] Writing the hold voltage to the source of the driving transistor during the hold phase includes:

[0016] The hold voltage is written to the source of the driving transistor in each hold frame.

[0017] Optionally, the display panel stores holding voltages for at least two different display brightness levels and at least two different picture refresh frequencies;

[0018] Determining the holding voltage according to the current picture refresh frequency and the current display brightness level includes:

[0019] A holding voltage corresponding to the current display brightness level and the current screen refresh frequency is searched for in the display panel; if the holding voltage corresponding to the current display brightness level and the current screen refresh frequency is stored in the display panel, the holding voltage is obtained from the display panel; if the holding voltage corresponding to the current display brightness level and the current screen refresh frequency is not stored in the display panel, the holding voltage corresponding to the current display brightness level and the current screen refresh frequency is determined by interpolation based on the holding voltages of at least two different display brightness levels and at least two different screen refresh frequencies stored in the display panel.

[0020] Optionally, the writing phase includes at least one writing frame; each writing frame includes a data writing sub-phase and a light emitting sub-phase, and each holding frame includes a light emitting sub-phase;

[0021] Before writing the holding voltage to the source of the driving transistor in the holding phase, the method further includes:

[0022] Writing a data voltage to the gate of the driving transistor in a data writing sub-phase of each writing frame, and controlling the driving transistor to drive the light-emitting unit to emit light in a light-emitting sub-phase of each writing frame;

[0023] The driving method further includes:

[0024] In the light-emitting sub-phase of each holding frame, the driving transistor is controlled to drive the light-emitting unit to emit light.

[0025] Optionally, the image refresh frequency of the display panel is greater than or equal to 1 Hz and less than or equal to 120 Hz.

[0026] According to another aspect of the present invention, a driving device for a display panel is provided, wherein the display panel includes a plurality of sub-pixels, each sub-pixel including a pixel circuit and a light-emitting unit, the pixel circuit being configured to drive the light-emitting unit to emit light; the pixel circuit including a driving transistor; and a driving cycle of the sub-pixel including a writing phase and a holding phase.

[0027] The driving device comprises:

[0028] A frequency determination module, used to determine the current image refresh frequency of the display panel;

[0029] a holding voltage determination module, configured to determine a holding voltage of the display panel according to the current picture refresh frequency; wherein different picture refresh frequencies correspond to different holding voltages;

[0030] A holding voltage writing module is used to write the holding voltage into the source of the driving transistor during the holding phase.

[0031] Optionally, the device further includes:

[0032] a display brightness level determination module, configured to determine a current display brightness level of the display panel before determining a holding voltage of the display panel according to the current image refresh frequency, wherein different display brightness levels correspond to the same minimum display brightness and different maximum display brightness;

[0033] The hold voltage determination module is further configured to determine the hold voltage according to the current screen refresh frequency and the current display brightness level; wherein, at the same screen refresh frequency, the hold voltages of at least some display brightness levels are different from the hold voltages of other display brightness levels.

[0034] According to another aspect of the present invention, a display device is provided, comprising a display panel and the driving device for the display panel according to any embodiment of the present invention.

[0035] The driving method of the display panel provided by the embodiment of the present invention sets different holding voltages corresponding to different picture refresh frequencies, determines the holding voltage of the display panel according to the current picture refresh frequency, writes the holding voltage to the source of the driving transistor in the holding stage, and performs targeted compensation according to the data voltage attenuation of different picture refresh frequencies, so that the Vgs voltage value at each picture refresh frequency is kept relatively stable throughout the entire driving cycle, so that the characteristics of the driving transistor are relatively stable in the same driving cycle, and the brightness difference between the holding stage and the writing stage in a driving cycle under each picture refresh frequency is small, thereby improving the display effect of the display panel.

[0036] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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.

[0038] Figure 1 is a flow chart of a method for driving a display panel provided by an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of a sub-pixel provided by an embodiment of the present invention;

[0040] Figure 3 This is a brightness difference data diagram of a display panel provided by an embodiment of the present invention;

[0041] Figure 4 This is another brightness difference data diagram of a display panel provided by an embodiment of the present invention.

[0042] Figure 5 is a schematic diagram of a driving device for a display panel provided by an embodiment of the present invention;

[0043] Figure 6 is a schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions 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 embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first", "second", etc. in the description 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. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] As mentioned in the background technology, the existing display panel has brightness changes when displaying. The inventor found through research that the reason for this problem is that when the display panel displays a picture at a relatively low picture refresh frequency, a driving cycle (corresponding to a frame of display picture) generally includes a writing stage and a holding stage. The writing stage generally includes a writing frame, and the holding stage includes multiple holding frames. When writing a frame, the data voltage is written to the driving transistor. After the driving transistor drives the light-emitting unit to emit light, it enters the holding stage. In the holding stage, the data voltage is not written to the holding frame, and the driving transistor generates a driving current based on the data voltage stored in the storage capacitor. When holding the frame, there is leakage in the storage capacitor, and the data voltage stored in the storage capacitor will decay, resulting in a change in the driving current generated by the driving transistor, which in turn causes the brightness of the light-emitting unit to change, making the display brightness of the display panel different in the writing frame and the holding frame, that is, the brightness of the display panel will change when displaying a frame of picture, affecting the display effect of the display panel.

[0047] In view of the above problems, an embodiment of the present invention provides a method for driving a display panel. Figure 1 is a flow chart of a method for driving a display panel provided by an embodiment of the present invention. Figure 2 is a schematic diagram of a sub-pixel provided by an embodiment of the present invention, with reference to Figure 1 and Figure 2 The display panel includes a plurality of sub-pixels, each sub-pixel includes a pixel circuit 101 and a light-emitting unit 102, the pixel circuit 101 is used to drive the light-emitting unit 102 to emit light; the pixel circuit 101 includes a driving transistor T2; a driving cycle of the sub-pixel includes a writing phase and a holding phase;

[0048] Methods include:

[0049] S110: Determine the current image refresh frequency of the display panel.

[0050] The screen refresh rate is the speed at which the screen updates, indicating how many frames are displayed per second. The current screen refresh rate is the current screen refresh rate. One drive cycle corresponds to the display of one frame. For example, the current screen refresh rate can be 1Hz, 10Hz, 30Hz, etc.

[0051] S120 . Determine a holding voltage of the display panel according to the current image refresh frequency; wherein different image refresh frequencies correspond to different holding voltages.

[0052] S130 , writing a holding voltage to the source of the driving transistor in the holding phase.

[0053] Specifically, the writing phase may include at least one writing frame. Figure 2 In each write frame of the write phase, the data voltage is written to the storage capacitor 1013 and the gate of the driving transistor T2 through the data write unit 1011, the driving transistor T2, and the compensation unit 1012. The driving transistor T2 generates a driving current based on the data voltage to drive the light-emitting unit 102 to emit light. In the hold phase, a hold voltage can be written to the source of the driving transistor T2 through the data write unit 1011. This embodiment adjusts the voltage difference Vgs between the gate and source of the driving transistor T2 by writing the hold voltage to the source of the driving transistor T2 during the hold phase, compensating for potential changes at the gate of the driving transistor T2 caused by leakage, thereby reducing the brightness difference between the hold phase and the write phase. Furthermore, since the data voltage corresponding to the same grayscale is different at different screen refresh frequencies, the attenuation of the data voltage is different during the data retention stage. By setting the retention voltages corresponding to different screen refresh frequencies to be different, targeted compensation is performed according to the data voltage attenuation at different screen refresh frequencies, so that the Vgs voltage value at each screen refresh frequency is kept relatively stable within the same driving cycle, and the characteristics of the driving transistor are relatively stable within the same driving cycle, so that the brightness difference between the retention stage and the writing stage within a driving cycle under each screen refresh frequency is small, thereby improving the display effect of the display panel.

[0054] Furthermore, when a hold voltage is written to the source of the driving transistor during the hold phase, the hold voltage may be written to the source of the driving transistor throughout the entire period of the hold phase when the data line connected to the sub-pixel does not need to write a data voltage to the gate of the driving transistor, or the hold voltage may be written to the source of the driving transistor during a portion of the hold phase when the data line connected to the sub-pixel does not need to write a data voltage to the gate of the driving transistor. Exemplarily, the hold phase may include multiple hold frames, and the hold voltage may be written to the source of the driving transistor during each hold frame, or may be written to the source of the driving transistor during a portion of the hold frames.

[0055] The driving method of the display panel provided by the embodiment of the present invention sets different holding voltages corresponding to different picture refresh frequencies, determines the holding voltage of the display panel according to the current picture refresh frequency, writes the holding voltage to the source of the driving transistor in the holding stage, and performs targeted compensation according to the data voltage attenuation of different picture refresh frequencies, so that the Vgs voltage value at each picture refresh frequency is kept relatively stable throughout the entire driving cycle, so that the characteristics of the driving transistor are relatively stable in the same driving cycle, and the brightness difference between the holding stage and the writing stage in a driving cycle under each picture refresh frequency is small, thereby improving the display effect of the display panel.

[0056] Optionally, before determining the holding voltage of the display panel according to the current image refresh frequency, the method further includes:

[0057] Determining a current display brightness level of the display panel, wherein different display brightness levels correspond to the same minimum display brightness and different maximum display brightness;

[0058] Determining the holding voltage of the display panel based on the current screen refresh rate includes:

[0059] The holding voltage is determined according to the current picture refresh frequency and the current display brightness level; wherein, at the same picture refresh frequency, the holding voltage of at least some display brightness levels is different from the holding voltage of other display brightness levels.

[0060] The minimum display brightness corresponding to different display brightness levels (DBV) is 0, and the maximum display brightness corresponding to different display brightness levels varies from a few nits to several hundred nits. For example, the maximum display brightness may include 2nit, 5nit, 10nit, 90nit, 100nit, 300nit, 500nit or 800nit. The brightness range that can be displayed at each display brightness level can be divided into 2 n Grayscales can be divided into grayscales of 0-255 or 0-1023, and the same grayscale corresponds to different brightness at different display brightness levels. The current display brightness level of the display panel is the display brightness level currently used by the display panel.

[0061] Table 1

[0062]

[0063] Table 1 is a brightness difference data table of a writing phase and a holding phase provided by an embodiment of the present invention. Figure 3 is a brightness difference data diagram of a display panel provided by an embodiment of the present invention, Figure 4 This is another brightness difference data diagram of a display panel provided by an embodiment of the present invention. Figure 3 and Figure 4 Table 1 shows the DB values ​​of a display panel at various refresh rates and brightness levels, all using the same hold voltage. The DB values ​​are measured using an optical device, such as a CA410. The DB values ​​reflect the brightness variation of the display panel. A larger absolute value of the DB value indicates a smaller brightness variation, i.e., less flicker. #1 and #2 in Table 1 represent different display panels. Table 1 uses maximum brightness to represent the display brightness level. For example, a brightness of 2 nits in Table 1 indicates a display brightness level with a maximum display brightness of 2 nits. Figure 3 It is a line chart drawn based on the DB value of the #1 display panel. Figure 4 This is a line graph drawn based on the DB value of the #2 display panel. Refer to Table 1. Figure 3 and Figure 4 When the same holding voltage is used for all refresh rates and brightness levels, the brightness changes differently at different frequencies. This results in poor display quality at some refresh rates and at some brightness levels. The DB value is: 120Hz > 60Hz > 1Hz > 10Hz > 30Hz. 30Hz has the largest brightness change, and 30Hz has the worst effect.

[0064] In this embodiment, different holding voltages are used by setting different screen refresh frequencies, and the holding voltages of at least some display brightness levels at the same screen refresh frequency are different from the holding voltages of other display brightness levels. This makes the characteristics of the driving transistors in the holding stage and the writing stage at each display brightness level at each screen refresh frequency relatively stable, the brightness difference between the holding stage and the writing stage is small, and the display effect is good.

[0065] Furthermore, it should be noted that the holding voltages for each screen refresh rate and each display brightness level can be determined in advance through experimental debugging. A different holding voltage can be written to the source of the driving transistor at each display brightness level. The brightness difference between the display panel during the data writing phase and the data holding phase is detected, and the holding voltage corresponding to the minimum brightness difference is used as the holding voltage corresponding to the display brightness level. In other embodiments, the holding voltage can also be determined using a formula or empirical experience.

[0066] Optionally, at the same screen refresh rate: different display brightness levels have different holding voltages, or different display brightness level ranges have different holding voltages.

[0067] Specifically, the display brightness ranges of different display brightness levels are different, and the ranges of data voltages at different display brightness levels are different. By setting different holding voltages corresponding to different display brightness levels, the holding voltage used for each display brightness level is consistent with its data voltage range, so that the characteristics of the driving transistor in the holding stage and the writing stage at each display brightness level are relatively stable, and the brightness differences between the holding stage and the writing stage are small, so that different display brightness levels have better compensation effects, further improving the display effect of the display panel.

[0068] In another embodiment, based on the maximum display brightness corresponding to each display brightness level, display brightness levels with similar maximum display brightness can be grouped into a display brightness level range. Within each display brightness level range, all display brightness levels have the same corresponding holding voltage. For example, if the display brightness levels corresponding to maximum display brightnesses of 1 nit, 2 nit, 3 nit, 4 nit, and 5 nit are grouped into a display brightness level range, then the holding voltages corresponding to the display brightness levels of 1 nit, 2 nit, 3 nit, 4 nit, and 5 nit are the same. This reduces the number of stored holding voltages and saves storage space in the driver chip.

[0069] Optionally, the hold phase includes a plurality of hold frames;

[0070] Writing a hold voltage to the source of the driver transistor during the hold phase includes:

[0071] A hold voltage is written to the source of the drive transistor in each hold frame.

[0072] Specifically, a hold voltage can be written to the source of the driving transistor throughout each hold frame. By writing the hold voltage to the source of the driving transistor during each hold frame, the brightness difference between each hold frame and the writing phase is small, thereby improving the display effect of the display panel.

[0073] Optionally, the display panel stores holding voltages for at least two different display brightness levels and at least two different picture refresh frequencies;

[0074] Determining the hold voltage based on the current screen refresh rate and the current display brightness level includes:

[0075] Search the display panel for a holding voltage corresponding to the current display brightness level and the current screen refresh frequency. If the display panel stores the holding voltage corresponding to the current display brightness level and the current screen refresh frequency, obtain the holding voltage from the display panel. If the display panel does not store the holding voltage corresponding to the current display brightness level and the current screen refresh frequency, interpolate and determine the holding voltage corresponding to the current display brightness level and the current screen refresh frequency based on the holding voltages of at least two different display brightness levels and at least two different screen refresh frequencies stored in the display panel.

[0076] Specifically, if the display panel stores a holding voltage corresponding to the current picture refresh frequency and the current display brightness level, the corresponding holding voltage is directly obtained from the display panel and written into the source of the driving transistor.

[0077] If the display panel does not store the holding voltage corresponding to the current display brightness level at the current screen refresh rate, but stores the holding voltages for other display brightness levels at the current screen refresh rate, the holding voltage corresponding to the current display brightness level can be directly interpolated based on the holding voltages for the other display brightness levels at the current display brightness level. For example, if the display panel stores the holding voltages corresponding to display brightness levels with a maximum display brightness of 800 nits and 500 nits at the current screen refresh rate, and the maximum display brightness corresponding to the current display brightness level is 700 nits, the holding voltage corresponding to the current display brightness level can be directly interpolated based on the holding voltages corresponding to the display brightness level with a maximum display brightness of 500 nits and the display brightness level with a maximum display brightness of 800 nits.

[0078] If the display panel does not store the holding voltage corresponding to the current frame refresh rate, the holding voltage for the current display brightness level at the current frame refresh rate may be determined by interpolating the holding voltages of other frame refresh rates. For example, if the display panel stores the holding voltages for display brightness levels with maximum display brightness of 800nit and 500nit at 1Hz and 30Hz; the maximum display brightness corresponding to the current display brightness level is 800nit, and the current screen refresh frequency is 10HZ, then the holding voltage for the display brightness level with maximum display brightness of 800nit at 10Hz is directly interpolated according to the holding voltages for the display brightness level with maximum display brightness of 800nit at 1Hz and 30Hz; if the maximum display brightness corresponding to the current display brightness level is 700nit, and the current screen refresh frequency is 10HZ, then the holding voltages for the display brightness levels with maximum display brightness of 800nit and 500nit at 10Hz are directly interpolated according to the holding voltages for the display brightness levels with maximum display brightness of 800nit and 500nit at 1Hz, and then the holding voltage of 700nit is determined based on the interpolation of the holding voltages for the display brightness levels with maximum display brightness of 800nit and 500nit at 10Hz.

[0079] It should be noted that the interpolation in this embodiment may be linear interpolation or nonlinear interpolation.

[0080] Optionally, the write phase includes at least one write frame; each write frame includes a data write sub-phase and a light emission sub-phase, and each hold frame includes a light emission sub-phase;

[0081] Before writing the holding voltage to the source of the driving transistor in the holding phase, the following steps are also included:

[0082] Writing a data voltage to the gate of the driving transistor in the data writing sub-phase of each writing frame, and controlling the driving transistor to drive the light-emitting unit to emit light in the light-emitting sub-phase of each writing frame;

[0083] The driving method also includes:

[0084] In the light-emitting sub-phase of each holding frame, the driving transistor is controlled to drive the light-emitting unit to emit light.

[0085] Specifically, each writing frame further includes a first initialization sub-phase and a second initialization sub-phase. Figure 2In the first initialization sub-phase, the first initialization unit 1014 is turned on, and the first initialization voltage is input to the gate of the driving transistor T2 through the first initialization unit 1014 to initialize the gate of the driving transistor T2. In the second initialization sub-phase, the second initialization unit 1015 can also be controlled to be turned on, and the second initialization voltage is written to the first terminal N1 of the light-emitting unit 102 through the second initialization unit 1015 to initialize the first terminal of the light-emitting unit 102.

[0086] During the data writing sub-phase of the write frame, the data writing unit 1011 and the compensation unit 1012 are turned on, and the data voltage is written into the gate of the driving transistor T2 and the storage capacitor 1013 via the data writing unit 1011 and the compensation unit 1012. In other embodiments, during the data writing sub-phase, the second initialization unit 1015 may be controlled to be turned on, and the second initialization voltage may be written into the first terminal N1 of the light-emitting unit 102 via the second initialization unit 1015, thereby initializing the first terminal N1 of the light-emitting unit 102.

[0087] In the light-emitting sub-phase of the writing frame, the first light-emitting control unit 1016 and the second light-emitting control unit 1017 are turned on, the driving transistor T2 generates a first driving current according to the data voltage, and the light-emitting unit 102 emits light in response to the first driving current.

[0088] During the data hold phase, no data voltage is written. The data hold phase includes multiple hold frames, each of which includes a first initialization sub-phase and a light-emission sub-phase. During the first initialization sub-phase, the second initialization unit 1015 is turned on to write the second initialization voltage to the first terminal N1 of the light-emitting unit 102. During the light-emission sub-phase of the hold frame, the first light-emission control unit 1016 and the second light-emission control unit 1017 are turned on, and the driving transistor T2 generates a second drive current based on the data voltage stored in the storage capacitor 1013. The light-emitting unit 102 emits light in response to the second drive current. Throughout each hold frame, the data write unit 1011 remains on, writing the hold voltage to the source of the driving transistor T2. The hold voltage is continuously provided to the source of the driving transistor T2 throughout the entire hold frame.

[0089] Optionally, the image refresh frequency of the display panel is greater than or equal to 1 Hz and less than or equal to 120 Hz.

[0090] Specifically, when the refresh rate of the display panel is low, the hold phase of the display panel is longer, causing the data voltage stored in the storage capacitor to decay more. When the refresh rate of the display panel is greater than or equal to 1Hz and less than or equal to 120Hz, the brightness difference between the write phase and the hold phase due to data voltage decay is more likely to occur. By setting different hold voltages for different refresh rates, the brightness difference between the data hold phase and the data write phase of the display panel is reduced at each refresh rate, thereby improving the display quality of the display panel.

[0091] An embodiment of the present invention further provides a driving device for a display panel. Figure 5 Schematic diagram of a driving device for a display panel provided by an embodiment of the present invention. The display panel includes a plurality of sub-pixels. The sub-pixels include a pixel circuit and a light-emitting unit. The pixel circuit is used to drive the light-emitting unit to emit light. The pixel circuit includes a driving transistor. A driving cycle of the sub-pixel includes a writing phase and a holding phase.

[0092] refer to Figure 5 , the driving device 300 of the display panel includes:

[0093] A frequency determination module 210 is used to determine the current image refresh frequency of the display panel;

[0094] A holding voltage determination module 220 is configured to determine a holding voltage of the display panel according to the current image refresh frequency; different image refresh frequencies correspond to different holding voltages;

[0095] The holding voltage writing module 230 is used to write the holding voltage to the source of the driving transistor during the holding phase.

[0096] Optionally, the device further includes:

[0097] A display brightness level determination module, configured to determine a current display brightness level of the display panel before determining a holding voltage of the display panel according to a current image refresh frequency, wherein different display brightness levels correspond to the same minimum display brightness and different maximum display brightness;

[0098] The hold voltage determination module 230 is further configured to determine the hold voltage according to the current image refresh rate and the current display brightness level; wherein, at the same image refresh rate, the hold voltages of at least some display brightness levels are different from the hold voltages of other display brightness levels.

[0099] Optionally, the holding phase includes a plurality of holding frames;

[0100] The hold voltage writing module 230 is specifically configured to write the hold voltage into the source of the driving transistor in each hold frame.

[0101] Optionally, the display panel stores holding voltages for at least two different display brightness levels and at least two different picture refresh frequencies;

[0102] The holding voltage determination module 230 is specifically configured to:

[0103] A holding voltage corresponding to the current display brightness level and the current screen refresh frequency is searched for in the display panel; if the holding voltage corresponding to the current display brightness level and the current screen refresh frequency is stored in the display panel, the holding voltage is obtained from the display panel; if the holding voltage corresponding to the current display brightness level and the current screen refresh frequency is not stored in the display panel, the holding voltage corresponding to the current display brightness level and the current screen refresh frequency is determined based on the holding voltages of at least two different display brightness levels and at least two different screen refresh frequencies stored in the display panel.

[0104] Optionally, the writing phase includes at least one writing frame; each writing frame includes a data writing sub-phase and a light emitting sub-phase, and each holding frame includes a light emitting sub-phase;

[0105] The device further comprises:

[0106] a first writing and light-emitting control module, configured to write a data voltage to the gate of the driving transistor in a data writing sub-phase of each writing frame before writing the holding voltage to the source of the driving transistor in the holding phase, and control the driving transistor to drive the light-emitting unit to emit light in a light-emitting sub-phase of each writing frame;

[0107] The device further comprises:

[0108] The second light-emitting control module is configured to control the driving transistor to drive the light-emitting unit to emit light in the light-emitting sub-phase of each holding frame.

[0109] Optionally, the image refresh frequency of the display panel is greater than or equal to 1 Hz and less than or equal to 120 Hz.

[0110] The driving device of the display panel of this embodiment can execute the driving method of the display panel provided by any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. For technical details not detailed in this embodiment, please refer to the driving method of the display panel described in any embodiment of the present invention.

[0111] An embodiment of the present invention further provides a display device, Figure 6 is a schematic diagram of a display device provided by an embodiment of the present invention, with reference to Figure 6The display device 100 includes a display panel 200 and a display panel driving device 300 provided by any embodiment of the present invention. The display device 100 can be, for example, a mobile phone, tablet, computer, monitor, smart watch, MP3, MP4, VR or other wearable device. The implementation principles and beneficial effects of the display device and the display panel driving device are similar and will not be repeated here.

[0112] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0113] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for driving a display panel, characterized in that: The display panel includes a plurality of sub-pixels, each sub-pixel includes a pixel circuit and a light-emitting unit, and the pixel circuit is used to drive the light-emitting unit to emit light; The pixel circuit includes a driving transistor; A driving cycle of the sub-pixel includes a writing phase and a holding phase; The method comprises: Determine the current refresh rate of the display panel; Determining a holding voltage of the display panel according to the current picture refresh frequency; wherein different picture refresh frequencies correspond to different holding voltages; writing the holding voltage to the source of the driving transistor during the holding phase; Before determining the holding voltage of the display panel according to the current picture refresh frequency, the method further includes: Determining a current display brightness level of the display panel, wherein different display brightness levels correspond to the same minimum display brightness and different maximum display brightness; Determining the holding voltage of the display panel according to the current picture refresh frequency includes: The holding voltage is determined according to the current picture refresh frequency and the current display brightness level; wherein, at the same picture refresh frequency, the holding voltages of at least some display brightness levels are different from the holding voltages of other display brightness levels.

2. The method according to claim 1, wherein: At the same screen refresh rate: different display brightness levels have different holding voltages, or different display brightness level ranges have different holding voltages.

3. The method according to claim 1, characterized in that The holding phase includes a plurality of holding frames; Writing the hold voltage to the source of the driving transistor during the hold phase includes: The hold voltage is written to the source of the driving transistor in each hold frame.

4. The method according to claim 2, wherein: The display panel stores holding voltages for at least two different display brightness levels and at least two different picture refresh frequencies; Determining the holding voltage according to the current picture refresh frequency and the current display brightness level includes: A holding voltage corresponding to the current display brightness level and the current screen refresh frequency is searched for in the display panel; if the holding voltage corresponding to the current display brightness level and the current screen refresh frequency is stored in the display panel, the holding voltage is obtained from the display panel; if the holding voltage corresponding to the current display brightness level and the current screen refresh frequency is not stored in the display panel, the holding voltage corresponding to the current display brightness level and the current screen refresh frequency is determined by interpolation based on the holding voltages of at least two different display brightness levels and at least two different screen refresh frequencies stored in the display panel.

5. The method according to claim 4, characterized in that The writing phase includes at least one writing frame; each writing frame includes a data writing sub-phase and a light emitting sub-phase, and each holding frame includes a light emitting sub-phase; Before writing the holding voltage to the source of the driving transistor in the holding phase, the method further includes: Writing a data voltage to the gate of the driving transistor in a data writing sub-phase of each writing frame, and controlling the driving transistor to drive the light-emitting unit to emit light in a light-emitting sub-phase of each writing frame; The driving method further includes: In the light-emitting sub-phase of each holding frame, the driving transistor is controlled to drive the light-emitting unit to emit light.

6. The method according to claim 1, characterized in that The image refresh frequency of the display panel is greater than or equal to 1 Hz and less than or equal to 120 Hz.

7. A driving device for a display panel, characterized in that: The display panel includes a plurality of sub-pixels, each sub-pixel includes a pixel circuit and a light-emitting unit, and the pixel circuit is used to drive the light-emitting unit to emit light; The pixel circuit includes a driving transistor; A driving cycle of the sub-pixel includes a writing phase and a holding phase; The driving device comprises: A frequency determination module, used to determine the current image refresh frequency of the display panel; a holding voltage determination module, configured to determine a holding voltage of the display panel according to the current picture refresh frequency; wherein different picture refresh frequencies correspond to different holding voltages; a holding voltage writing module, configured to write the holding voltage into the source of the driving transistor during the holding phase; a display brightness level determination module, configured to determine a current display brightness level of the display panel before determining a holding voltage of the display panel according to the current image refresh frequency, wherein different display brightness levels correspond to the same minimum display brightness and different maximum display brightness; The hold voltage determination module is further configured to determine the hold voltage according to the current screen refresh frequency and the current display brightness level; wherein, at the same screen refresh frequency, the hold voltages of at least some display brightness levels are different from the hold voltages of other display brightness levels.

8. A display device, characterized in that: A display panel comprising a display panel and the driving device of the display panel according to claim 7.

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