Driving method, device and display equipment of display panel

Abstract

This invention discloses a driving method, apparatus, and display device for a display panel. The display panel includes multiple sub-pixels, each sub-pixel including a pixel circuit and a light-emitting unit. The output terminal of the pixel circuit is connected to a first terminal of the light-emitting unit; the second terminal of the light-emitting unit is connected to a first power supply voltage. One driving cycle of the sub-pixel includes a data writing phase and a data holding phase, the data holding phase including a first initialization sub-phase. The driving method includes: in the first initialization sub-phase of the data holding phase, writing a preset voltage to the first terminal of the light-emitting unit; wherein the absolute value of the difference between the preset voltage and the first power supply voltage is greater than zero and less than the operating voltage of the light-emitting unit, and the preset voltage is used to compensate for the brightness of the light-emitting unit. The technical solution of this invention reduces the brightness difference of the display panel during the data holding phase and the data writing phase, improving the display effect of the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a driving method, apparatus, and display device for a display panel. Background Technology

[0002] With the rapid development of display technology, people have increasingly higher requirements for display panels. However, existing display panels suffer from brightness variations during the display process, affecting the display effect. Summary of the Invention

[0003] This invention provides a driving method, apparatus, and display device for a display panel to solve the problem of brightness variation during the display process.

[0004] According to one aspect of the present invention, a driving method for a display panel is provided. The display panel includes a plurality of sub-pixels, each sub-pixel including a pixel circuit and a light-emitting unit. The output terminal of the pixel circuit is connected to a first terminal of the light-emitting unit, and a second terminal of the light-emitting unit is connected to a first power supply voltage. A driving cycle of the sub-pixel includes a data writing phase and a data holding phase, the data holding phase including a first initialization sub-phase.

[0005] The method includes:

[0006] In the first initialization sub-stage of the data holding stage, a preset voltage is written to the first terminal of the light-emitting unit; wherein the absolute value of the difference between the preset voltage and the first power supply voltage is greater than zero and less than the operating voltage of the light-emitting unit, and the preset voltage is used to compensate for the luminous brightness of the light-emitting unit.

[0007] Optionally, in the first initialization sub-stage of the data holding stage, before writing the preset voltage to the first terminal of the light-emitting unit, the method further includes:

[0008] Determine the current display brightness level of the display panel;

[0009] In the first initialization sub-stage of the data holding phase, a preset voltage is written to the first terminal of the light-emitting unit, specifically including:

[0010] In the first initialization sub-stage of the data holding stage, the preset voltage corresponding to the current display brightness level is written to the first terminal of the light-emitting unit; wherein, the preset voltages corresponding to different display brightness levels are different, or, the preset voltages corresponding to different display brightness level groups are different, each display brightness level group includes at least two display brightness levels, and the preset voltages corresponding to all display brightness levels in each display brightness level group are the same.

[0011] Optionally, the higher the maximum display brightness corresponding to the display brightness level, the greater the absolute value of the difference between the preset voltage corresponding to the display brightness level and the first power supply voltage.

[0012] Optionally, in the first initialization sub-stage of the data holding stage, before writing the preset voltage to the first terminal of the light-emitting unit, the method further includes:

[0013] Determine the current screen refresh rate used by the display panel;

[0014] In the first initialization sub-stage of the data holding phase, a preset voltage is written to the first terminal of the light-emitting unit, including:

[0015] In the first initialization sub-stage of the data holding stage, a preset voltage corresponding to the currently used screen refresh rate is written to the first terminal of the light-emitting unit. Different screen refresh rates correspond to different preset voltages.

[0016] Optionally, in the first initialization sub-stage of the data holding stage, before writing the preset voltage to the first terminal of the light-emitting unit, the method further includes:

[0017] Get the current ambient temperature of the display panel;

[0018] In the first initialization sub-stage of the data holding phase, writing a preset voltage to the first terminal of the light-emitting unit includes:

[0019] In the first initialization sub-stage of the data holding stage, a preset voltage corresponding to the current ambient temperature is written to the first terminal of the light-emitting unit. The preset voltage is different for different ambient temperatures.

[0020] Optionally, the display panel stores at least two preset voltages corresponding to different display brightness levels;

[0021] Before writing the preset voltage corresponding to the current display brightness level to the first terminal of the light-emitting unit in the first initialization sub-stage of the data holding stage, the method further includes:

[0022] The preset voltage corresponding to the current display brightness level is searched in the display panel. If the preset voltage corresponding to the current display brightness level is stored in the display panel, the preset voltage corresponding to the current display brightness level is obtained from the display panel. If the preset voltage corresponding to the current display brightness level is not stored in the display panel, the preset voltage corresponding to the current display brightness level is determined according to the preset voltages corresponding to at least two different display brightness levels stored in the display panel.

[0023] Optionally, the refresh rate of the display panel is greater than or equal to 1Hz and less than or equal to 30Hz.

[0024] Optionally, the data holding phase includes multiple holding frames, each holding frame including a first initialization sub-phase and a first light emission sub-phase;

[0025] In the first initialization sub-stage of the data holding phase, writing the preset voltage to the first terminal of the light-emitting unit includes:

[0026] In the first initialization sub-stage of each of the holding frames, the preset voltage is written to the first terminal of the light-emitting unit.

[0027] Optionally, the data writing stage includes a second initialization sub-stage, a data writing sub-stage, and a second light-emitting sub-stage; the pixel circuit includes a driving unit, which is used to provide a driving signal to the light-emitting unit;

[0028] The method further includes:

[0029] In the second initialization sub-stage, an initialization voltage is written to the first terminal of the light-emitting unit and the driving unit of the pixel circuit;

[0030] During the data writing sub-stage, a data voltage is written to the driving unit;

[0031] During the first and second light-emitting sub-stages of the data holding phase, the driving unit is controlled to provide a driving signal to the light-emitting unit, causing the light-emitting unit to emit light.

[0032] According to another aspect of the present invention, a driving device for a display panel is provided. The display panel includes a plurality of sub-pixels, each sub-pixel including a pixel circuit and a light-emitting unit. The output terminal of the pixel circuit is connected to a first terminal of the light-emitting unit, and a second terminal of the light-emitting unit is connected to a first power supply voltage. A driving cycle of the sub-pixel includes a data writing phase and a data holding phase, the data holding phase including a first initialization sub-phase. The driving device includes:

[0033] A compensation module is used to write a preset voltage to the first terminal of the light-emitting unit during the first initialization sub-stage of the data holding stage; wherein the absolute value of the difference between the preset voltage and the first power supply voltage is greater than zero and less than the operating voltage of the light-emitting unit, and the preset voltage is used to compensate for the luminous brightness of the light-emitting unit.

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

[0035] In the technical solution of this invention embodiment, in the first initialization sub-stage of the data holding stage, a preset voltage is written to the first end of the light-emitting unit to compensate for the voltage of the first end of the light-emitting unit. Before the light-emitting unit emits light, the first end of the light-emitting unit stores a certain potential. Since the preset voltage is different from the first power supply voltage of the second end of the light-emitting unit, there is a certain voltage difference between the two ends of the light-emitting unit. This can compensate for the driving current flowing through the light-emitting unit when the light-emitting unit emits light, so that the driving current of the light-emitting unit in the data holding stage is close to the driving current in the data writing stage. This makes the light emission brightness of the light-emitting unit in the data holding stage and the data writing stage close, reducing the brightness difference of the display panel in the data holding stage and the data writing stage, and improving the display effect of the display panel.

[0036] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of a sub-pixel circuit structure provided in an embodiment of the present invention;

[0039] Figure 2 This is a flowchart of a driving method for a display panel provided in an embodiment of the present invention;

[0040] Figure 3 This is a flowchart of another display panel driving method provided in an embodiment of the present invention;

[0041] Figure 4 This is a brightness difference index curve diagram in the preset voltage determination process provided in the embodiments of the present invention;

[0042] Figure 5 This is a flowchart of another display panel driving method provided in an embodiment of the present invention;

[0043] Figure 6 This is a flowchart of another display panel driving method provided in an embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of another sub-pixel circuit structure provided in an embodiment of the present invention;

[0045] Figure 8 This is a timing diagram corresponding to a driving method for a display panel provided in an embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the structure of a display panel driving device provided in an embodiment of the present invention. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] As mentioned in the background section, existing display panels exhibit brightness variations during display. The inventors discovered through research that this problem arises because when a display panel displays an image at a relatively low refresh rate, a driving cycle typically includes a write phase and a hold phase. The write phase usually includes a write frame, and the hold phase includes multiple hold frames. During a write frame, data voltage is written to the driving unit, which then drives the light-emitting diode (LED) to emit light. During hold frames, no data voltage is written; the driving unit generates a driving current based on the data voltage stored in the storage unit. The decay of the data voltage stored in the storage unit causes changes in the driving current generated by the driving unit, which in turn causes changes in the brightness of the LED. This results in a difference in display brightness between the write and hold frames, meaning the brightness of the display panel changes even when displaying a single frame, affecting the display effect. Currently, two common solutions are used to improve the inconsistent display brightness between write and hold frames: the first is to adjust the light-emitting duration of the LED to change the brightness difference between different frames; the second is to directly change the driving voltage of the pixel writing circuit to change the brightness difference between different frames. However, both of these methods alter the display brightness of both the written frame and the held frame, resulting in a significant difference between the display brightness of the written frame and the target display brightness.

[0050] To address the aforementioned technical problems, embodiments of the present invention provide a method for driving a display panel. Figure 1 This is a schematic diagram of a sub-pixel circuit structure provided in an embodiment of the present invention, for reference. Figure 1 The display panel includes multiple sub-pixels, each sub-pixel including a pixel circuit 101 and a light-emitting unit 102. The output terminal of the pixel circuit 101 is connected to the first terminal N1 of the light-emitting unit 102, and the second terminal of the light-emitting unit 102 is connected to the first power supply voltage VSS. One driving cycle of the sub-pixel includes a data writing stage and a data holding stage. The data holding stage includes a first initialization sub-stage.

[0051] In this design, the power supply terminal of the pixel circuit 101 is connected to a second power supply voltage VDD. When the first power supply voltage VSS is negative, the second power supply voltage VDD is positive; when the first power supply voltage VSS is positive, the second power supply voltage VDD is negative. The light-emitting unit 102 is, for example, an Organic Light-Emitting Diode (OLED). The pixel circuit 101 generates a driving current based on the data voltage and inputs this driving current to the light-emitting unit 102 through the first terminal N1. The light-emitting unit 102 responds to the driving current and emits light, realizing sub-pixel illumination and enabling the display panel to display an image. The pixel circuit 101 includes, for example, a data writing unit 1011, a driving unit 1012, a storage unit 1013, a first initialization unit 1014, a second initialization unit 1015, a first light-emitting control unit 1016, and a second light-emitting control unit 1017. It should be noted that... Figure 1 Only one case of pixel circuit 101 is shown, but it is not limited.

[0052] One driving cycle of a sub-pixel includes a data writing phase and a data holding phase. In the data writing phase, a data voltage is written to the driving unit 1012 of the pixel circuit 101. The driving unit 1012 generates a first driving current based on the data voltage and inputs the driving current to the light-emitting unit 102 through the first terminal N1. The light-emitting unit 102 emits light in response to the first driving current. In the data holding phase, no more data voltage is written to the pixel circuit 101. The data holding phase includes multiple holding frames. Each holding frame includes a first initialization sub-phase and a first light-emitting sub-phase. The first initialization sub-phase is used to initialize the potential of the first terminal N1 of the light-emitting unit 102. In the light-emitting phase, the driving unit 1012 generates a second driving current based on the data voltage stored in the storage unit 1013. The light-emitting unit 102 emits light in response to the second driving current.

[0053] Figure 2 This is a flowchart of a display panel driving method provided in an embodiment of the present invention, see reference. Figure 1 and Figure 2 The driving method for this display panel includes:

[0054] S110. During the data writing stage, a data voltage is written to the driving unit, and the driving unit is controlled to provide a driving signal to the light-emitting unit, so that the light-emitting unit emits light.

[0055] Specifically, refer to Figure 1During the data writing phase, the control data writing unit 1011 is turned on, and the data voltage is written through the data writing unit 1011 to one end of the drive unit 1012 connected to the storage unit 1013. Then, the control first light-emitting control unit 1016 and the second light-emitting control unit 1017 are turned on, and the drive unit 1012 generates a first drive current according to the data voltage. The light-emitting unit 102 responds to the first drive current to emit light.

[0056] S120. In the first initialization sub-stage of the data holding stage, a preset voltage is written to the first terminal of the light-emitting unit; wherein the absolute value of the difference between the preset voltage and the first power supply voltage is greater than zero and less than the operating voltage of the light-emitting unit, and the preset voltage is used to compensate for the light emission brightness of the light-emitting unit.

[0057] Specifically, the absolute value of the difference between the preset voltage and the first power supply voltage is greater than zero, meaning the preset voltage is different from the first power supply voltage. When the first end of the light-emitting unit is the anode and the second end is the cathode, the first power supply voltage is lower than the second power supply voltage, and the preset voltage is higher than the first power supply voltage. When the first end of the light-emitting unit is the cathode and the second end is the anode, the first power supply voltage is higher than the second power supply voltage, and the preset voltage is lower than the first power supply voltage. Furthermore, if the absolute value of the difference between the preset voltage and the first power supply voltage is less than the operating voltage of the light-emitting unit, then the light-emitting unit will not emit light when the preset voltage is written in the first initialization sub-stage.

[0058] The preset voltage is used to compensate for the luminous brightness of the light-emitting unit. When the target luminous brightness of a sub-pixel differs, the data voltage, its attenuation, and the change in driving current also differ, resulting in different luminous brightness differences between the data holding and data writing phases. The preset voltage can be determined based on the sub-pixel's data voltage. For example, the luminous brightness difference between the data holding and data writing phases for each data voltage can be determined experimentally beforehand, thus determining the preset voltage for each data voltage. The preset voltage can be pre-stored in the driver chip's memory module. In the first initialization sub-phase, the driver chip calls the corresponding preset voltage based on the sub-pixel's data voltage. Furthermore, to reduce the difficulty of compensation, a preset voltage can be set for each data voltage range. Additionally, display panels typically have multiple different display brightness levels based on different maximum display brightness levels; to reduce the difficulty of compensation, different display brightness levels can also be assigned different preset voltages.

[0059] Specifically, refer to Figure 1In the first initialization sub-stage of the data retention phase, a preset voltage is written to the first terminal N1 of the light-emitting unit 102 to compensate for the voltage of the first terminal N1 of the light-emitting unit 102. Before the light-emitting unit 102 emits light, the first terminal N1 of the light-emitting unit 102 has a certain potential. Since the preset voltage is different from the first power supply voltage VSS of the second terminal of the light-emitting unit 102, there is a certain voltage difference between the two terminals of the light-emitting unit 102 after the first initialization sub-stage. This can compensate for the driving current flowing through the light-emitting unit 102 when it emits light, so that the driving current of the light-emitting unit 102 in the data retention phase is close to that in the data writing phase. This makes the brightness of the light-emitting unit 102 in the data retention phase and the data writing phase close. This avoids the reduction of the driving current generated by the pixel circuit 101 in the data retention phase due to the attenuation of the data voltage stored in the storage unit 1013, which would cause a large difference in the brightness of the light-emitting unit 102 between the data writing phase and the data retention phase, thus affecting the display effect of the display panel.

[0060] In the first initialization sub-stage of the data holding phase, the technical solution of this embodiment compensates the voltage of the first end of the light-emitting unit by writing a preset voltage to the first end of the light-emitting unit. Before the light-emitting unit emits light, the first end of the light-emitting unit stores a certain potential. Since the preset voltage is different from the first power supply voltage of the second end of the light-emitting unit, there is a certain voltage difference between the two ends of the light-emitting unit. This can compensate for the driving current flowing through the light-emitting unit when it emits light, so that the driving current of the light-emitting unit in the data holding phase is close to that in the data writing phase. As a result, the brightness of the light-emitting unit in the data holding phase and the data writing phase is close, reducing the brightness difference of the display panel in the data holding phase and the data writing phase, and improving the display effect of the display panel.

[0061] Figure 3 This is a flowchart of another display panel driving method provided in an embodiment of the present invention, see reference. Figure 1 and Figure 3 The driving method for this display panel includes:

[0062] S210. Determine the current display brightness level of the display panel; wherein, different display brightness levels correspond to the same minimum display brightness, but different maximum display brightness.

[0063] In this system, the minimum display brightness corresponding to each display brightness level (DBV) is 0, while the maximum display brightness corresponding to each level varies from a few nits to several hundred nits. For example, the maximum display brightness could include 2 nits, 5 nits, 10 nits, 90 nits, 100 nits, 300 nits, 500 nits, or 800 nits. The display brightness range for each level can be divided into 2...n Each grayscale level can be divided into several levels, such as 0-255 grayscale levels or 0-1023 grayscale levels. The same grayscale level corresponds to different brightness levels at different display brightness levels. The current display brightness level of the display panel is the display brightness level used by the display panel for the current displayed image.

[0064] S220. In the first initialization sub-stage of the data holding stage, the preset voltage corresponding to the current display brightness level is written to the first terminal of the light-emitting unit; wherein, the preset voltages corresponding to different display brightness levels are different, or, the preset voltages corresponding to different display brightness level groups are different, each display brightness level group includes at least two display brightness levels, and the preset voltages corresponding to all display brightness levels in each display brightness level group are the same.

[0065] The preset voltage can be obtained through experimental debugging. At each display brightness level, different compensation voltages can be written to the first terminal of the light-emitting unit. The brightness difference between the data writing and data holding phases of the display panel is detected, and the compensation voltage corresponding to the minimum brightness difference is taken as the preset voltage for the corresponding display brightness level. In other embodiments, the preset voltage can also be derived through formulas or experience. Specifically, different display brightness levels have different display brightness ranges, resulting in different data voltage ranges, different data voltage attenuations, and different changes in drive current at different brightness levels. By setting different preset voltages for different display brightness levels, the preset compensation voltage corresponding to the currently used display brightness level of the display panel is written to the first terminal N1 of the light-emitting unit. This reduces the brightness difference between the data holding and data writing phases of the display panel, allowing the preset voltage at different display brightness levels to better compensate for the changes in drive current at their corresponding brightness levels. This ensures good compensation effects for all display brightness levels and further improves the display panel's display performance.

[0066] In another implementation, display brightness levels with similar maximum display brightness can be grouped together based on their corresponding maximum display brightness levels. All display brightness levels within each group share the same preset voltage. For example, if display brightness levels with maximum display brightness of 1 nit, 2 nit, 3 nit, 4 nit, and 5 nit are grouped together, then the preset voltages for these maximum display brightness levels are identical. This reduces the number of stored preset voltages, saving storage space in the driver chip.

[0067] Optionally, the display panel stores at least two preset voltages corresponding to different display brightness levels;

[0068] Before writing the preset voltage corresponding to the current display brightness level to the first terminal of the light-emitting unit in the first initialization sub-stage of the data retention phase, the following is also included:

[0069] The system searches for the preset voltage corresponding to the current display brightness level in the display panel. If the display panel stores the preset voltage corresponding to the current display brightness level, it retrieves the preset voltage corresponding to the current display brightness level from the display panel. If the display panel does not store the preset voltage corresponding to the current display brightness level, it determines the preset voltage corresponding to the current display brightness level based on the preset voltages corresponding to at least two different display brightness levels stored in the display panel.

[0070] Specifically, if the display panel stores a preset voltage corresponding to the current display brightness level DBV, the preset voltage is directly obtained from the display panel and written into the first terminal of the light-emitting unit.

[0071] If the display panel does not store a preset voltage corresponding to the current display brightness level, the preset voltage corresponding to a display brightness level close to the current display brightness level can be directly used as the preset voltage for the current display brightness level. For example, if the maximum display brightness corresponding to the current display brightness level is 700 nits, and the display panel stores display brightness levels with maximum display brightness of 800 nits and 500 nits, then the preset voltage corresponding to the display brightness level with a maximum display brightness of 800 nits can be directly used as the preset voltage for the current display brightness level; this reduces storage and computational load.

[0072] If the display panel does not store the preset voltage corresponding to the current display brightness level, an interpolation algorithm can be used to determine the preset voltage for the current display brightness level. For example, if the maximum display brightness corresponding to the current display brightness level is 700 nits, and the display panel stores preset voltages corresponding to display brightness levels of 800 nits and 600 nits, then interpolation can be performed on the preset voltages corresponding to the maximum display brightness levels of 800 nits and 600 nits to calculate the preset voltage corresponding to the current display brightness level. This improves the accuracy of the preset voltage, better compensates the light-emitting units, and helps improve the display effect of the display panel.

[0073] Based on the above technical solution, optionally, the greater the maximum display brightness corresponding to the display brightness level, the greater the absolute value of the difference between the preset voltage corresponding to the display brightness level and the first power supply voltage.

[0074] Specifically, refer to Figure 1When the first terminal N1 of the light-emitting unit 102 is the anode of the light-emitting unit 102, the preset voltage is greater than the first power supply voltage VSS. The higher the maximum display brightness corresponding to the display brightness level, the higher the preset voltage corresponding to the display brightness level. When the first terminal N1 of the light-emitting unit 102 can be the cathode of the light-emitting unit 102, the preset voltage is less than the first power supply voltage VSS. The higher the maximum display brightness corresponding to the display brightness level, the lower the preset voltage corresponding to the display brightness level.

[0075] The higher the maximum display brightness corresponding to a display brightness level, the wider the data voltage range and the wider the corresponding drive current range, resulting in a greater range of current changes caused by data voltage attenuation. A larger absolute value of the difference between the preset voltage and the first power supply voltage VSS leads to a larger voltage difference across the light-emitting unit when it emits light, thus providing greater compensation for the drive current of the light-emitting unit. This prevents large current changes from causing lower brightness during the data holding phase, thereby reducing the brightness difference between the display panel during the data holding and data writing phases. Similarly, the lower the maximum display brightness corresponding to a display brightness level, the smaller the absolute value of the difference between the preset voltage and the first power supply voltage VSS.

[0076] The following section explains the magnitude and compensation effect of the preset voltage in conjunction with the process of determining the preset voltage. The method for determining the preset voltage includes:

[0077] Step a: Determine the compensation voltage range corresponding to multiple grayscale values ​​within the same display brightness level, and select multiple compensation voltages within this compensation voltage range.

[0078] For example, several display brightness levels can be selected, such as the display brightness level corresponding to a maximum display brightness of 2 nits, the display brightness level corresponding to a maximum display brightness of 90 nits, and the display brightness level corresponding to a maximum display brightness of 800 nits for experimentation. Multiple grayscale values ​​can be selected from each display brightness level, for example, grayscale values ​​127, 160, 208, and 255. The compensation voltage range is, for example, -3.3V to -1.5V, and multiple compensation voltages can be selected from this range, for example, -1.5V, -1.8V, -1.9V, -2.0V, -2.1V, -2.5V, -3.0V, and -3.3V.

[0079] For example, when selecting a compensation voltage within the compensation voltage range, it can be selected based on experience; or it can be selected according to a fixed step value, such as selecting a compensation voltage every 0.5V or every 0.1V.

[0080] It should be noted that the compensation voltage range and the specific compensation voltage can be determined according to the actual situation, and this embodiment does not impose any limitations.

[0081] Step b: In the first initialization sub-stage of the data holding phase, each compensation voltage is applied to the first terminal of the light-emitting unit.

[0082] Specifically, by compensating each compensation voltage to the first end of the light-emitting unit, voltage compensation is performed on the first end of the light-emitting unit, so that the first end of the light-emitting unit stores a certain potential before the light-emitting unit emits light. Since the compensation power supply value is different from the first power supply voltage at the second end of the light-emitting unit, there is a certain voltage difference between the two ends of the light-emitting unit after the first initialization sub-stage, thereby compensating for the driving current flowing through the light-emitting unit when the light-emitting unit emits light.

[0083] Step c: Detect the brightness difference index between the data writing stage and the data holding stage corresponding to each compensation voltage.

[0084] Specifically, the brightness difference index is used to measure the brightness difference between the data writing phase and the data holding phase. The brightness difference index is obtained, for example, by calculating the brightness difference or ratio between the data writing and data holding phases. The brightness values ​​during the data writing and data holding phases are detected to obtain the brightness difference index corresponding to each compensation voltage.

[0085] Step d: Determine the preset voltage corresponding to the display brightness level based on the compensation voltage corresponding to the minimum brightness difference index in each grayscale value.

[0086] For example, Figure 4 This is a brightness difference index curve diagram during the preset voltage determination process provided in the embodiments of the present invention, for reference. Figure 4The horizontal axis represents compensation voltage, and the vertical axis represents brightness difference index. Curve ① shows the brightness difference index corresponding to different compensation voltages at 127 gray levels within the display brightness level corresponding to a maximum display brightness of 2 nits; Curve ② shows the brightness difference index corresponding to different compensation voltages at 160 gray levels within the display brightness level corresponding to a maximum display brightness of 2 nits; Curve ③ shows the brightness difference index corresponding to different compensation voltages at 208 gray levels within the display brightness level corresponding to a maximum display brightness of 2 nits; Curve ④ shows the brightness difference index corresponding to different compensation voltages at 255 gray levels within the display brightness level corresponding to a maximum display brightness of 2 nits; Curve ⑤ shows the brightness difference index corresponding to different compensation voltages at 127 gray levels within the display brightness level corresponding to a maximum display brightness of 89 nits. The brightness difference indexes are as follows: Curve ⑥ shows the brightness difference index corresponding to different compensation voltages at 255 gray levels within the display brightness level corresponding to a maximum display brightness of 89 nits; Curve ⑦ shows the brightness difference index corresponding to different compensation voltages at 127 gray levels within the display brightness level corresponding to a maximum display brightness of 90 nits; Curve ⑧ shows the brightness difference index corresponding to different compensation voltages at 255 gray levels within the display brightness level corresponding to a maximum display brightness of 90 nits; Curve ⑨ shows the brightness difference index corresponding to different compensation voltages at 127 gray levels within the display brightness level corresponding to a maximum display brightness of 800 nits; Curve ⑨ shows the brightness difference index corresponding to different compensation voltages at 255 gray levels within the display brightness level corresponding to a maximum display brightness of 800 nits. Figure 4 It can be seen that, at the same display brightness level, the compensation voltage corresponding to the minimum brightness difference index is the same across different grayscale values. Therefore, the preset voltage can be set to be the same for the same display brightness level; furthermore, the higher the maximum display brightness corresponding to the display brightness level, the lower the preset voltage. Figure 4 As shown, by compensating the first end of the light-emitting unit with a preset voltage, the brightness difference index is reduced, which effectively reduces the brightness difference index, that is, reduces the brightness difference of the display panel during the data writing stage and the data holding stage.

[0087] Optionally, in the first initialization sub-stage of the data holding stage, before writing the preset voltage to the first terminal of the light-emitting unit, the method further includes: determining the current screen refresh rate of the display panel;

[0088] In the first initialization sub-stage of the data holding phase, a preset voltage is written to the first terminal of the light-emitting unit, including: in the first initialization sub-stage of the data holding phase, a preset voltage corresponding to the currently used screen refresh rate is written to the first terminal of the light-emitting unit, and the preset voltage corresponding to different screen refresh rates is different.

[0089] Specifically, at different screen refresh rates, the data voltage corresponding to the same grayscale level is different. Therefore, during the data holding phase, the attenuation of the data voltage and the change in driving current are different. By setting different preset voltages for different screen refresh rates, targeted compensation can be performed according to the changes in driving current at different screen refresh rates, resulting in better compensation effects at different screen refresh rates and further improving the display effect of the display panel.

[0090] Figure 5 This is a flowchart of another display panel driving method provided in an embodiment of the present invention. Optionally, refer to... Figure 5 The driving methods for the display panel include:

[0091] S310. Determine the current display brightness level of the display panel; wherein, different display brightness levels correspond to the same minimum display brightness, but different maximum display brightness.

[0092] S320. Determine the current screen refresh rate of the display panel. Note that the preset voltage for the same display brightness level differs at different screen refresh rates.

[0093] S330. In the first initialization sub-stage of the data holding stage, the preset voltage corresponding to the current display brightness level under the current screen refresh rate is written to the first terminal of the light-emitting unit. The preset compensation voltage is different for different display brightness levels.

[0094] Specifically, at different screen refresh rates, the data voltage corresponding to the same grayscale at the same display brightness level is different. Therefore, during the data hold phase, the attenuation of the data voltage and the change in driving current differ. By setting different preset voltages for the same display brightness level at different screen refresh rates, targeted compensation can be performed based on the changes in driving current at different refresh rates. This ensures better compensation effects at different screen refresh rates, further improving the display panel's display performance.

[0095] Optionally, in the first initialization sub-stage of the data holding stage, before writing the preset voltage to the first terminal of the light-emitting unit, the method further includes: obtaining the current ambient temperature of the display panel;

[0096] In the first initialization sub-stage of the data holding phase, writing a preset voltage to the first terminal of the light-emitting unit includes: writing a preset voltage corresponding to the current ambient temperature to the first terminal of the light-emitting unit in the first initialization sub-stage of the data holding phase, wherein the preset voltage is different for different ambient temperatures.

[0097] Specifically, the attenuation of data voltage corresponding to the same grayscale level varies with the ambient temperature of the display panel, resulting in different changes in drive current. For example, at excessively low or high ambient temperatures, the data voltage may attenuate rapidly and significantly, leading to substantial changes in drive current. By setting different preset voltages for different ambient temperatures, targeted compensation can be performed based on the changes in drive current at different temperatures, ensuring better compensation effects under various ambient temperatures and further improving the display panel's display performance.

[0098] Figure 6 This is a flowchart of another display panel driving method provided in an embodiment of the present invention. Optionally, refer to... Figure 6 The driving methods for the display panel include:

[0099] S410. Determine the current display brightness level of the display panel; wherein, different display brightness levels correspond to the same minimum display brightness, but different maximum display brightness.

[0100] S420: Obtain the current ambient temperature of the display panel. Note that the preset voltage for the same display brightness level differs depending on the ambient temperature of the display panel.

[0101] S430. In the first initialization sub-stage of the data holding stage, the preset voltage corresponding to the current display brightness level at the current ambient temperature is written to the first terminal of the light-emitting unit; wherein, the preset voltage corresponding to different display brightness levels is different.

[0102] Specifically, a temperature sensor can be installed in the display panel to obtain the current ambient temperature. When the ambient temperature of the display panel varies, the attenuation of the data voltage corresponding to the same grayscale at the same brightness level differs, resulting in different changes in the drive current. For example, at excessively low or high ambient temperatures, the data voltage may attenuate rapidly, leading to significant voltage drop and substantial changes in the drive current. By setting different preset voltages for the same brightness level under different ambient temperatures, targeted compensation can be performed based on the changes in drive current at different temperatures, ensuring better compensation effects under various ambient temperatures and further improving the display panel's display performance.

[0103] Based on the above technical solution, optionally, the refresh rate of the display panel is greater than or equal to 1Hz and less than or equal to 30Hz.

[0104] Specifically, when the refresh rate of the display panel is low, the data retention phase of the display panel is longer, resulting in greater voltage attenuation of the data stored in the storage unit. Display panels with a refresh rate greater than or equal to 1Hz and less than or equal to 30Hz are more prone to brightness differences between the data writing and data retention phases due to data voltage attenuation. By writing a preset voltage to the first terminal of the light-emitting unit in the first initialization sub-stage of the data retention phase, the first terminal of the light-emitting unit stores a certain potential before emitting light. Since the preset voltage differs from the first power supply voltage at the second terminal of the light-emitting unit, there is a voltage difference between the two terminals of the light-emitting unit. This compensates for the driving current flowing through the light-emitting unit, making the driving current of the light-emitting unit in the data retention phase closer to that in the data writing phase. Consequently, the brightness of the light-emitting unit in the data retention and data writing phases is similar, reducing the brightness difference between the two phases and improving the display effect.

[0105] Optionally, the data holding phase includes multiple holding frames, each holding frame including a first initialization sub-phase and a first light emission sub-phase;

[0106] In the first initialization sub-stage of the data holding phase, writing the preset voltage to the first terminal of the light-emitting unit includes:

[0107] In the first initialization sub-stage of each holding frame, a preset voltage is written to the first terminal of the light-emitting unit.

[0108] Specifically, by writing a preset voltage in the first initialization sub-stage of each holding frame, the driving current of the light-emitting unit is compensated in each holding frame. As a result, the light emission brightness of the light-emitting unit in each holding frame of the data holding stage is close to the light emission brightness of the light-emitting unit in the data writing stage, further improving the display effect of the display panel.

[0109] Optionally, the data writing stage includes a second initialization sub-stage, a data writing sub-stage, and a second light-emitting sub-stage; the pixel circuit includes a driving unit, which is used to provide driving signals to the light-emitting unit;

[0110] The driving method for this display panel also includes:

[0111] In the second initialization sub-stage, an initialization voltage is written to the first end of the light-emitting unit and the driving unit of the pixel circuit;

[0112] During the data writing sub-stage, data voltage is written to the drive unit;

[0113] In the first and second light-emitting stages, the control and driving unit provides driving signals to the light-emitting unit, causing the light-emitting unit to emit light.

[0114] Specifically, the initialization voltage includes a first initialization voltage and a second initialization voltage. (See reference) Figure 1 In the second initialization sub-stage, the first initialization unit 1014 is turned on, and the first initialization voltage is input through the first initialization unit 1014 to the end connected to the driving unit 1012 and the storage unit 1013, thus initializing the end connected to the driving unit 1012 and the storage unit 1013. In the second initialization sub-stage, the second initialization unit 1015 can also be turned on, and the second initialization voltage is written through the second initialization unit 1015 to the first end of the light-emitting unit 102, thereby initializing the first end of the light-emitting unit 102.

[0115] During the data writing sub-stage, the data writing unit 1011 is turned on, and the data voltage is written through the data writing unit 1011 to the end of the drive unit 1012 connected to the storage unit 1013. In some other embodiments, during the data writing sub-stage, the second initialization unit 1015 can also be turned on, and the second initialization voltage can be written through the second initialization unit 1015 to the first end of the light-emitting unit 102, thereby initializing the first end of the light-emitting unit 102.

[0116] In the second light-emitting stage, the first light-emitting control unit 1016 and the second light-emitting control unit 1017 are turned on, the driving unit 1012 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.

[0117] During the data holding phase, no more data voltage is written. The data holding phase includes multiple holding frames, each of which includes a first initialization sub-phase and a first light-emitting sub-phase. In the first initialization sub-phase, the second initialization unit 1015 is turned on, and a preset voltage is compensated to the first terminal N1 of the light-emitting unit 102 through the second initialization unit 1015. In the first light-emitting sub-phase, the first light-emitting control unit 1016 and the second light-emitting control unit 1017 are turned on, and the driving unit 1012 generates a second driving current according to the data voltage stored in the storage unit 1013. The light-emitting unit 102 emits light in response to the second driving current.

[0118] The driving cycle of the sub-pixel will be explained below with reference to a specific circuit:

[0119] Based on the above technical solutions, Figure 7 This is a schematic diagram of another sub-pixel circuit structure provided in an embodiment of the present invention. Optionally, refer to... Figure 7The pixel circuit 101 may include, for example, a 2T1C circuit and its variations, a 7T1C circuit and its variations, or other types of pixel circuits. The 2T1C circuit refers to a pixel circuit including a data writing transistor, a driving transistor, and a storage capacitor; the 7T1C circuit, for example, refers to a pixel circuit including a data writing transistor, a driving transistor, a threshold compensation transistor, a first initialization transistor, a second initialization transistor, a first light-emitting control transistor, a second light-emitting control transistor, and a storage capacitor. Furthermore, the transistors in the pixel circuit 101 may all be P-type transistors, or all be N-type transistors; alternatively, some transistors may be P-type transistors and some may be N-type transistors.

[0120] Figure 7 The illustration shows a 7T1C pixel circuit 101. The pixel circuit 101 includes a data writing transistor T1, a driving transistor T2, a threshold compensation transistor T3, a first initialization transistor T4, a second initialization transistor T5, a first light emission control transistor T6, a second light emission control transistor T7, and a storage capacitor C1. The threshold compensation transistor T3 and the first initialization transistor T4 are N-type transistors, and the remaining transistors are P-type transistors.

[0121] In pixel circuit 101, the control electrode of data writing transistor T1 is connected to the second scan signal Scan2, and the first electrode of data writing transistor T1 is connected to the data voltage Vdata. The control electrode of threshold compensation transistor T3 is connected to the third scan signal Scan3. When the second scan signal Scan2 controls the data writing transistor T1 to turn on and the third scan signal Scan3 controls the threshold compensation transistor T3 to turn on, the data voltage Vdata is written to driving transistor T2 through data writing transistor T1 and threshold compensation transistor T3. The control electrode of driving transistor T2 is connected to storage capacitor C1, which is used to store the data voltage Vdata.

[0122] The control electrode of the first initialization transistor T4 is connected to the first scan signal Scan1, and the first electrode of the first initialization transistor T4 is connected to the first initialization voltage Vref1. When the first scan signal Scan1 controls the first initialization transistor T4 to turn on, the first initialization voltage Vref1 is written to the control electrode of the driving transistor T2 through the first initialization transistor T4. The control electrode of the second initialization transistor T5 is connected to the fourth scan signal Scan4, and the first electrode of the second initialization transistor T5 is connected to the control signal C, which includes a preset voltage. The second electrode of the second initialization transistor T5 is connected to the first terminal N1 of the light-emitting unit 102. When the fourth scan signal Scan4 controls the second initialization transistor T5 to turn on, the preset voltage is written to the first terminal N1 of the light-emitting unit 102 through the second initialization transistor T5. The first electrode of the driving transistor T2 is connected to the second power supply voltage VDD through the first light-emitting control transistor T6, and the second electrode of the driving transistor T2 is connected to the first terminal N1 of the light-emitting unit 102 through the second light-emitting control transistor T7. The second terminal of the light-emitting unit 102 is connected to the first power supply voltage VSS. The control electrodes of the first light-emitting control transistor T6 and the second light-emitting control transistor T7 are connected to the enable signal EM1. When the enable signal EM1 controls the first light-emitting control transistor T6 and the second light-emitting control transistor T7 to be turned on, the driving transistor T2 generates a driving current, and the light-emitting unit 102 emits light in response to the driving current.

[0123] Figure 8 This is a timing diagram corresponding to a display panel driving method provided in an embodiment of the present invention. Optionally, refer to... Figure 8 One driving cycle of a subpixel includes a data writing phase t0 and a data holding phase. The data writing phase t0 includes a second initialization sub-phase t01, a data writing sub-phase t02, and a second emission sub-phase t03. The data holding phase includes multiple holding frames t1, and each holding frame t1 includes a first initialization sub-phase t11 and a first emission sub-phase t12.

[0124] Specifically, in one driving cycle of a subpixel, the data writing phase t0 is executed first, followed by the data holding phase. The following description of one driving cycle of a subpixel is based on the driving timing, but is not limited to any particular phase.

[0125] refer to Figure 7 and Figure 8 ,

[0126] In the second initialization sub-stage t01, the first scan signal Scan1 is high, the first initialization transistor T4 is turned on, and the first initialization voltage Vref1 is written to the control terminal of the driving transistor T2 to initialize the control terminal of the driving transistor T2. Meanwhile, the fourth scan signal Scan4 is low, the second initialization transistor T5 is turned on, and the second initialization transistor T5 writes the second initialization voltage to the first terminal of the light-emitting unit 102 to initialize the first terminal of the light-emitting unit 102.

[0127] During the data writing sub-stage t02, the second scan signal Scan2 is low and the third scan signal Scan3 is high. Threshold compensation transistor T3 and data writing transistor T1 are turned on, and the data voltage Vdata is written to the control electrode of driving transistor T2. Furthermore, threshold compensation transistor T3 captures the threshold voltage of driving transistor T2 and applies it to the control electrode of driving transistor T2, performing threshold compensation on driving transistor T2.

[0128] In some other embodiments, during the data writing sub-stage t02, the second initialization transistor T5 writes the second initialization voltage to the first terminal of the light-emitting unit 102 to initialize the first terminal of the light-emitting unit 102.

[0129] In the second light-emitting stage t03, the enable signal EM1 is at a low level, the first light-emitting control transistor T6 and the second light-emitting control transistor T7 are turned on, the driving transistor T2 generates a driving current, and the light-emitting unit 102 emits light in response to the driving current.

[0130] In the first initialization sub-stage t11 of each holding frame t1, the fourth scan signal Scan4 is at a low level, the second initialization transistor T5 is turned on, and the second initialization transistor T5 writes the preset voltage into the first terminal N1 of the light-emitting unit 102 to perform voltage compensation on the first terminal N1 of the light-emitting unit 102.

[0131] It should be noted that, Figure 8 The illustration shows the case where the second initialization transistor T5 is turned on at a low level, but this is not a limitation. In some other embodiments, the second initialization transistor T5 may also be turned on at a high level.

[0132] In the first light-emitting stage t12, the enable signal EM1 is at a low level, the first light-emitting control transistor T6 and the second light-emitting control transistor T7 are turned on, the driving transistor T2 generates a driving current, and the light-emitting unit 102 emits light in response to the driving current.

[0133] Figure 9 This is a schematic diagram of the structure of a display panel driving device provided in an embodiment of the present invention, with reference to... Figure 1 and Figure 9The driving device for the display panel includes a compensation module 510, which is used to write a preset voltage to the first terminal of the light-emitting unit during the first initialization sub-stage of the data holding stage; wherein the absolute value of the difference between the preset voltage and the first power supply voltage is greater than zero and less than the operating voltage of the light-emitting unit, and the preset voltage is used to compensate for the light-emitting brightness of the light-emitting unit.

[0134] Optionally, refer to Figure 9 The driving device for the display panel also includes a display brightness level determination module 520, which is used to determine the current display brightness level of the display panel. The minimum display brightness is the same for different display brightness levels, but the maximum display brightness is different. The compensation module 510 is specifically used to write the preset voltage corresponding to the current display brightness level to the first terminal of the light-emitting unit in the first initialization sub-stage of the data holding stage. The preset voltage is different for different display brightness levels.

[0135] The display panel driving device of this embodiment can execute the display panel driving method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the method execution.

[0136] Optionally, the driving device for the display panel also includes a refresh rate determination module, which is used to determine the current screen refresh rate of the display panel.

[0137] Optionally, the compensation module 510 is specifically used in the first initialization sub-stage of the data holding stage to write the preset voltage corresponding to the currently used screen refresh frequency into the first terminal of the light-emitting unit. The preset voltage is different for different screen refresh frequencies.

[0138] Optionally, the compensation module 510 is further used in the first initialization sub-stage of the data holding stage to write the preset voltage corresponding to the currently used display brightness level at the currently used screen refresh frequency into the first terminal of the light-emitting unit; wherein, the preset compensation voltage corresponding to the same display brightness level is different at different screen refresh frequencies.

[0139] Optionally, the driving device for the display panel also includes an ambient temperature determination module, which is used to obtain the current ambient temperature of the display panel.

[0140] Optionally, the compensation module 510 is further used in the first initialization sub-stage of the data holding stage to write the preset voltage corresponding to the current ambient temperature into the first terminal of the light-emitting unit. The preset voltage is different for different ambient temperatures.

[0141] Optionally, the compensation module 510 is further used in the first initialization sub-stage of the data holding stage to write the preset voltage corresponding to the currently used display brightness level at the current ambient temperature into the first terminal of the light-emitting unit; wherein, when the ambient temperature of the display panel is different, the preset voltage corresponding to the same display brightness level is different.

[0142] Optionally, the data holding stage includes multiple holding frames, each holding frame including a first initialization sub-stage and a first light emission sub-stage; the compensation module is specifically used to write a preset voltage to the first terminal of the light emission unit in the first initialization sub-stage of each holding frame.

[0143] Optionally, the data writing stage includes a second initialization sub-stage, a data writing sub-stage, and a second light-emitting sub-stage; the driving device of the display panel further includes a second initialization module, a data writing module, and a driving module. The second initialization module is used to write an initialization voltage to the first end of the light-emitting unit and the driving unit of the pixel circuit in the second initialization sub-stage; the data writing module is used to write a data voltage to the driving unit in the data writing sub-stage; and the driving module is used to control the driving unit to provide a driving signal to the light-emitting unit in the first light-emitting sub-stage and the second light-emitting sub-stage, so that the light-emitting unit emits light.

[0144] The technical solution of this embodiment also provides a display device, which includes a display panel and a driving device for the display panel provided in any embodiment of the present invention. The display device can be, for example, a mobile phone, tablet, computer, monitor, smartwatch, MP3 player, MP4 player, VR device, or other wearable device. The implementation principle and beneficial effects of the driving device for the display panel are similar to those of the display device, and will not be repeated here.

[0145] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0146] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A driving method of a display panel, characterized by, The display panel comprises a plurality of sub-pixels, each of the sub-pixels comprising a pixel circuit and a light emitting unit, an output terminal of the pixel circuit being connected to a first terminal of the light emitting unit, and a second terminal of the light emitting unit being connected to a first power supply voltage; One driving cycle of the sub-pixel comprises a data writing stage and a data holding stage, and the data holding stage comprises a first initialization sub-stage; The method comprises: In the first initialization sub-stage of the data holding stage, a preset voltage is written to the first terminal of the light emitting unit, wherein an absolute value of a difference between the preset voltage and the first power supply voltage is greater than zero and less than an operating voltage of the light emitting unit, and the preset voltage is used to compensate for a light emitting brightness of the light emitting unit; The data writing stage comprises a second initialization sub-stage, a data writing sub-stage and a second light emitting sub-stage, the pixel circuit comprises a driving unit configured to provide a driving signal to the light emitting unit, and the method further comprises: In the second initialization sub-stage, an initialization voltage is written to the first terminal of the light emitting unit and the driving unit of the pixel circuit; In the data writing sub-stage, a data voltage is written to the driving unit; In the first light emitting sub-stage and the second light emitting sub-stage of the data holding stage, the driving unit is controlled to provide the driving signal to the light emitting unit, so that the light emitting unit emits light.

2. The driving method according to claim 1, wherein Before the preset voltage is written to the first terminal of the light emitting unit in the first initialization sub-stage of the data holding stage, the method further comprises: determining a current display brightness level of the display panel; In the first initialization sub-stage of the data holding stage, the preset voltage is written to the first terminal of the light emitting unit, specifically comprising: In the first initialization sub-stage of the data holding stage, a preset voltage corresponding to the current display brightness level is written to the first terminal of the light emitting unit, wherein the preset voltage corresponding to different display brightness levels is different, or the preset voltage corresponding to different display brightness level groups is different, each display brightness level group comprises at least two display brightness levels, and the preset voltage corresponding to all display brightness levels in each display brightness level group is the same.

3. The driving method according to claim 2, wherein The greater the maximum display brightness corresponding to the display brightness level, the greater the absolute value of the difference between the preset voltage corresponding to the display brightness level and the first power supply voltage.

4. The driving method of claim 1, wherein, before the preset voltage is written to the first terminal of the light emitting unit in the first initialization sub-stage of the data holding stage, the method further comprises: determining a current picture refresh frequency used by the display panel; In the first initialization sub-stage of the data holding stage, the preset voltage is written to the first terminal of the light emitting unit, comprising: In the first initialization sub-stage of the data holding stage, a preset voltage corresponding to the current picture refresh frequency is written to the first terminal of the light emitting unit, and the preset voltage corresponding to different picture refresh frequencies is different.

5. The driving method of claim 1, wherein, ​ In the first initialization sub-stage of the data retention stage, before the preset voltage is written to the first end of the light emitting unit, the method further comprises: obtaining a current ambient temperature in which the display panel is located; In the first initialization sub-stage of the data retention stage, the preset voltage corresponding to the current ambient temperature is written to the first end of the light emitting unit, and the preset voltages corresponding to different ambient temperatures are different.

6. The driving method of claim 2, wherein: the display panel stores preset voltages corresponding to at least two different display brightness levels respectively; In the first initialization sub-stage of the data retention stage, before the preset voltage corresponding to the current display brightness level is written to the first end of the light emitting unit, the method further comprises: In the display panel, the preset voltage corresponding to the current display brightness level is searched, if the display panel stores the preset voltage corresponding to the current display brightness level, the preset voltage corresponding to the current display brightness level is obtained from the display panel, and if the display panel does not store the preset voltage corresponding to the current display brightness level, the preset voltage corresponding to the current display brightness level is determined according to the preset voltages corresponding to at least two different display brightness levels stored in the display panel respectively. The refresh frequency of the display panel is greater than or equal to 1 Hz and less than or equal to 30 Hz.

7. The driving method according to claim 1, wherein The data retention stage comprises a plurality of retention frames, and each retention frame comprises a first initialization sub-stage and a first light emitting sub-stage.

8. The driving method according to claim 1, wherein In the first initialization sub-stage of the data retention stage, the preset voltage is written to the first end of the light emitting unit. In the first initialization sub-stage of each retention frame, the preset voltage is written to the first end of the light emitting unit. The driving method of claim 1-8; the display panel comprises a plurality of sub-pixels, each sub-pixel comprises a pixel circuit and a light emitting unit, the output end of the pixel circuit is connected to the first end of the light emitting unit, and the second end of the light emitting unit is connected to a first power supply voltage; 9. A driving device of a display panel, characterized by comprising: One driving cycle of the sub-pixel comprises a data writing stage and a data retention stage, and the data retention stage comprises a first initialization sub-stage; the driving device comprises: a compensation module, configured to write a preset voltage to the first end of the light emitting unit in the first initialization sub-stage of the data retention stage; wherein the absolute value of the difference between the preset voltage and the first power supply voltage is greater than zero and less than the working voltage of the light emitting unit, and the preset voltage is used to compensate the light emitting brightness of the light emitting unit. The display panel and the driving device of claim 9.

10. A display device, characterized by comprising: ​

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