Driving method and driving device of display panel and display device

Abstract

The invention discloses a driving method and a driving device of a display panel and a display device. The driving method of the display panel comprises the following steps: determining a display brightness level currently adopted by the display panel; if the currently-adopted display brightness level is greater than the set display brightness level, determining the duty ratio of a light-emitting control signal corresponding to the currently-adopted display brightness level according to the currently-adopted display brightness level and predetermined duty ratios of light-emitting control signals corresponding to at least two first preset display brightness levels; the first preset display brightness levels are greater than or equal to a set display brightness level, and the at least two first preset display brightness levels comprise the maximum display brightness level of the display panel and at least one display brightness level of which the first power supply voltage is changed relative to the previous display brightness level; and driving the display panel to display a picture according to the duty ratio of the light-emitting control signal corresponding to the currently adopted display brightness level. The display effect of the display panel can be improved.

Description

Technical Field

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

[0002] With the development of display technology, people have higher and higher requirements on the display performance of display panels. However, the display effect of existing display panels is poor. 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, there is provided a method for driving a display panel, comprising:

[0005] Determine the display brightness level currently used by the display panel;

[0006] If the currently used display brightness level is greater than the set display brightness level, the duty cycle of the light control signal corresponding to the currently used display brightness level is determined according to the currently used display brightness level and the duty cycle of the light control signal corresponding to at least two first preset display brightness levels determined in advance; wherein the first preset display brightness level is greater than or equal to the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level at which the first power supply voltage changes relative to the previous display brightness level; and the display panel is driven to display a picture according to the duty cycle of the light control signal corresponding to the currently used display brightness level.

[0007] Optionally, determining the duty cycle of the light control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty cycles of the light control signals corresponding to at least two predetermined first preset display brightness levels includes:

[0008] According to the currently used display brightness level and the duty ratios of the light control signal corresponding to the predetermined at least two first preset display brightness levels, the duty ratio of the light control signal corresponding to the currently used display brightness level is determined by an interpolation algorithm.

[0009] Optionally, determining the duty cycle of the light control signal corresponding to the currently used display brightness level by an interpolation algorithm according to the currently used display brightness level and the duty cycles of the light control signal corresponding to the predetermined at least two first preset display brightness levels includes:

[0010] The duty cycle of the light emitting control signal corresponding to the currently used display brightness level is determined by an interpolation algorithm according to the duty cycles of the light emitting control signals corresponding to two first preset display brightness levels adjacent to the currently used display brightness level.

[0011] Optionally, the interpolation algorithm includes linear interpolation.

[0012] Optionally, before determining the duty cycle of the light control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty cycles of the light control signals corresponding to at least two predetermined first preset display brightness levels, the method further includes:

[0013] driving the display panel to display a picture with a preset gray scale according to an initial duty cycle of the light emitting control signal at at least two first preset display brightness levels;

[0014] Respectively obtaining first initial display brightness of the display panel at at least two first preset display brightness levels;

[0015] The duty cycle of the light emitting control signal corresponding to each of the first preset display brightness levels is determined according to the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels.

[0016] Optionally, determining a duty cycle of a light emitting control signal corresponding to each of the first preset display brightness levels according to the first initial display brightness and a target brightness corresponding to each of the first preset display brightness levels includes:

[0017] Determine a brightness difference between the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels;

[0018] Determining a duty cycle compensation value corresponding to each of the first preset display brightness levels according to the brightness difference and the pulse width parameter; wherein the pulse width parameter is the brightness corresponding to a unit duty cycle of the light emitting control signal;

[0019] The duty cycle of the light emitting control signal corresponding to each of the first preset display brightness levels is determined according to the initial duty cycle of the light emitting control signal and the duty cycle compensation value corresponding to each of the first preset display brightness levels.

[0020] Optionally, different display brightness levels correspond to different pulse width parameters;

[0021] Preferably, when the first preset display brightness level is the maximum display brightness level of the display panel, the target brightness of the first preset display brightness level is equal to the first initial display brightness.

[0022] Optionally, before determining the duty cycle of the light emitting control signal corresponding to each of the first preset display brightness levels according to the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels, the method further includes:

[0023] Driving the display panel to display a picture with a preset grayscale according to the initial duty cycle of the light emitting control signal at at least two second preset display brightness levels respectively; wherein each of the second preset display brightness levels is adjacent to a first preset display brightness level;

[0024] respectively obtaining a second initial display brightness of the display panel at each second preset display brightness level;

[0025] A target brightness corresponding to the first preset display brightness level is determined according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level.

[0026] Optionally, determining a target brightness corresponding to the first preset display brightness level according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level includes:

[0027] determining a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level as a target brightness corresponding to the first preset display brightness level, wherein the first power supply voltage corresponding to the second preset display brightness level adjacent to the first preset display brightness level and the first preset display brightness level is different; or

[0028] The average of the second initial display brightness of two second preset display brightness levels adjacent to the first preset display brightness level is determined as the target brightness corresponding to the first preset display brightness level; wherein, among the two second preset display brightness levels adjacent to the first preset display brightness level, one second preset display brightness level is greater than the first preset display brightness level, and one second preset display brightness level is less than the first preset display brightness level.

[0029] Optionally, under at least two second preset display brightness levels, driving the display panel to display a preset gray scale according to the initial duty cycle of the light emitting control signal comprises:

[0030] According to the initial duty cycle of the light emitting control signal, driving the plurality of display panels to display a preset gray scale at at least two second preset display brightness levels;

[0031] Correspondingly, determining a target brightness corresponding to the first preset display brightness level according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level includes:

[0032] for each display panel, determining an initial target brightness corresponding to the first preset display brightness level of the display panel according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level;

[0033] The target brightness is determined according to an initial target brightness corresponding to the first preset display brightness level of the plurality of display panels.

[0034] Optionally, determining the target brightness according to the initial target brightness corresponding to the first preset display brightness level of the plurality of display panels includes:

[0035] The target brightness is determined according to an average value of initial target brightnesses corresponding to the first preset display brightness levels of the plurality of display panels.

[0036] Optionally, the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and each display brightness level at which the first power supply voltage changes relative to a previous display brightness level; or, the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and the minimum display brightness level at which the first power supply voltage changes relative to a previous display brightness level;

[0037] Optionally, the set display brightness level is a display brightness level at which the first power supply voltage changes.

[0038] Optionally, the display panel includes a plurality of sub-pixels, each sub-pixel includes a light-emitting unit; an anode of the light-emitting unit is used to receive the first power supply voltage.

[0039] According to another aspect of the present invention, there is provided a driving device for a display panel, comprising:

[0040] A display brightness level determination module, used to determine the display brightness level currently used by the display panel;

[0041] a duty cycle determination module, configured to determine the duty cycle of the light control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty cycles of the light control signals corresponding to at least two first preset display brightness levels determined in advance, if the currently used display brightness level is greater than the set display brightness level; wherein the first preset display brightness level is greater than the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level at which the first power supply voltage changes relative to the previous display brightness level;

[0042] The driving module is used to drive the display panel to display an image according to the duty cycle of the light emitting control signal corresponding to the currently used display brightness level.

[0043] According to another aspect of the present invention, a display device is provided, comprising a display panel and a driving device for the display panel according to any embodiment of the present invention.

[0044] In an embodiment of the present invention, when the currently adopted display brightness level is greater than the set display brightness level, the duty cycle of the light control signal corresponding to the currently adopted display brightness level is determined according to the currently adopted display brightness level and the duty cycle of the light control signal corresponding to at least two first preset display brightness levels determined in advance; wherein, the first preset display brightness level is greater than or equal to the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level in which the first power supply voltage changes relative to the previous display brightness level. In the prior art, the display brightness level with higher brightness adopts the same light control signal, that is, the duty cycle of the light control signal is the same. In the embodiment of the present invention, the duty cycle of the light control signal corresponding to the first preset display brightness in which the first power supply voltage changes is determined in advance, and the duty cycle of the light control signal corresponding to the first preset display brightness level is determined according to the duty cycle of the light control signal corresponding to the first preset display brightness level, so that the duty cycle of the light control signal corresponding to the current display brightness level can compensate for the brightness change caused by the change of the first power supply voltage, so that the brightness of different display brightness levels changes continuously, avoiding brightness jump when dragging the brightness bar, avoiding screen flickering, and improving the display effect of the display panel.

[0045] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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.

[0047] Figure 1 It is a brightness change graph under different display brightness levels;

[0048] Figure 2 is a flow chart of a method for driving a display panel provided by an embodiment of the present invention;

[0049] Figure 3 is a flow chart of another display panel compensation method provided by an embodiment of the present invention;

[0050] Figure 4 is a flow chart of another display panel compensation method provided by an embodiment of the present invention;

[0051] Figure 5 is a flow chart of another display panel compensation method provided by an embodiment of the present invention;

[0052] Figure 6 It is the relationship curve between the display brightness level and brightness after compensation;

[0053] Figure 7 is a schematic diagram of a driving device for a display panel provided by an embodiment of the present invention;

[0054] Figure 8 is a schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] High Dynamic Range (HDR) refers to an image technology that can capture a higher range of color, brightness, and contrast than ordinary photos. With HDR technology, bright skies and dark shadows can be captured in the same photo without overexposure or underexposure, thus presenting a more realistic and delicate picture effect. Because HDR technology can restore more realistic picture scenes, it is widely used in digital videos, movies, games, virtual reality and other fields.

[0058] In order to present this effect, the display panel is usually required to support higher local brightness, that is, the local peak brightness is required to be high. However, due to the limitations of the display panel, the first power supply voltage ELVDD needs to be increased to achieve a higher peak brightness. Therefore, different first power supply voltages ELVDD need to be set for the highlight part and the low-brightness part under the premise of taking into account the power consumption of the first power supply voltage ELVDD, that is, different first power supply voltages ELVDD are set for different display brightness levels. The Data voltages of different display brightness levels are determined by linear interpolation, resulting in a mismatch between the Data voltage obtained by the actual linear interpolation and the changed first power supply voltage ELVDD, which results in a screen flickering problem caused by the jump of the first power supply voltage ELVDD. Figure 1 This is a brightness change diagram under different display brightness levels, refer to Figure 1 , Figure 1 The horizontal axis is the display brightness level, i.e. DBV, and the vertical axis is brightness. The first power supply voltage used by DBV before point A is E1, the first power supply voltage used by DBV between point A and point A and point B is E2, the first power supply voltage used by DBV between point B and point C and point B is E3, and the first power supply voltage used by DBV after point C is E4. Under the DBV with the change of the first power supply voltage ELVDD, the brightness jumps, resulting in the brightness jump of adjacent display brightness levels under the same grayscale, that is, when dragging the brightness bar, the brightness of the display panel jumps, affecting the display effect.

[0059] Based on the above problems, the present invention provides a method for driving a display panel. Figure 2 is a flow chart of a method for driving a display panel provided by an embodiment of the present invention, with reference to Figure 2 , the driving method of the display panel includes:

[0060] S110: Determine the display brightness level currently used by the display panel.

[0061] The minimum display brightness at each display brightness level is 0, and the maximum display brightness is different. For example, the maximum display brightness at different display brightness levels can be 2nit, 5nit, 10nit, 30nit, 100nit, 600nit, 1000nit, etc. The total number of grayscales displayed at each display brightness level is the same, for example, 0-255 grayscales can be displayed. At different display brightness levels, the display brightness of the same grayscale is different.

[0062] S120, if the currently used display brightness level is greater than the set display brightness level, then according to the currently used display brightness level, and the duty ratio of the light control signal corresponding to at least two first preset display brightness levels, determine the duty ratio of the light control signal corresponding to the currently used display brightness level; wherein the first preset display brightness level is greater than or equal to the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level at which the first power supply voltage changes relative to the previous display brightness level. The duty ratio refers to the percentage of the effective level time of the light control signal in the period.

[0063] Wherein, the display panel includes a plurality of sub-pixels, each of which includes a light-emitting unit; the anode of the light-emitting unit is used to receive a first power supply voltage. The display brightness level is set to a display brightness level of the display panel, and the maximum display brightness of the set display brightness level can be greater than the set value. Exemplarily, the set display brightness level can be a display brightness level at which the first power supply voltage ELVDD changes. The display brightness level greater than the set display brightness level is a display brightness level with a higher maximum display brightness, and the first power supply voltage ELVDD of some display brightness levels greater than the set display brightness level jumps. Exemplarily, all display brightness levels less than the set display brightness level use the same first power supply voltage EL1, and the first power supply voltage of all display brightness levels between the set display brightness level and the first display brightness level changes to EL2, wherein the first display brightness level is greater than the set display brightness level. The first power supply voltage of all displays between the first display brightness level and the second display brightness level changes to EL3, wherein the second display brightness level is greater than the first display brightness level. When the current display brightness level is greater than the set display brightness level, the current display brightness level needs to adjust the duty cycle of the light-emitting control signal so that the display brightness of the current display brightness level changes continuously with the display brightness of other display brightness levels.

[0064] The first preset display brightness level includes at least one display brightness level at which the first power supply voltage ELVDD changes. Exemplarily, one first preset display brightness level is the maximum display brightness level of the display panel, and another first preset display brightness level is a display brightness level at which the first power supply voltage ELVDD changes. In addition, the first preset display brightness level may also include two or more display brightness levels at which the first power supply voltage ELVDD changes. Exemplarily, the number of the first preset display brightness levels may be the number of display brightness levels at which the first power supply voltage ELVDD changes plus one, that is, the first preset display brightness level may include all display brightness levels at which the first power supply voltage ELVDD changes and the maximum display brightness level of the display panel.

[0065] The display panel includes a plurality of sub-pixels, and the light-emitting control signal is used to control the light-emitting of the sub-pixels. The duty cycle of the light-emitting control signal is the ratio of the width of the effective level to the total width within one cycle of the light-emitting control signal. The effective level of the light-emitting control signal is the level that can make the sub-pixel emit light. The greater the duty cycle of the light-emitting control signal, the greater the light-emitting brightness of the sub-pixel. The duty cycle of the first preset display brightness level can be determined in advance by the brightness deviation between the actual display brightness of the display panel and the target brightness. The duty cycle of the light-emitting control signal corresponding to the predetermined first preset display brightness level enables the display brightness of the first preset display brightness level and the adjacent display brightness level to change continuously, that is, when the brightness bar is dragged, the brightness of the first preset display brightness level will not jump. The duty cycle of the current display brightness level determined by the duty cycle of the light-emitting control signal corresponding to the first preset display brightness level enables the brightness of the current display brightness level and the brightness of the adjacent display brightness level to change continuously.

[0066] In addition, the duty cycle of the light-emitting control signal corresponding to the currently used display brightness level is determined based on the currently used display brightness level and the duty cycle of the light-emitting control signal corresponding to at least two first preset display brightness levels determined in advance. The duty cycle of the light-emitting control signal corresponding to the currently used display brightness level can be determined by interpolation based on the duty cycle of the light-emitting control signal corresponding to at least two first preset display brightness levels determined in advance.

[0067] S130 , driving the display panel to display an image according to the duty cycle of the light emitting control signal corresponding to the currently used display brightness level.

[0068] In an embodiment of the present invention, when the currently adopted display brightness level is greater than the set display brightness level, the duty cycle of the light control signal corresponding to the currently adopted display brightness level is determined according to the currently adopted display brightness level and the duty cycle of the light control signal corresponding to at least two first preset display brightness levels determined in advance; wherein, the first preset display brightness level is greater than or equal to the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level in which the first power supply voltage changes relative to the previous display brightness level. In the prior art, the display brightness level with higher brightness adopts the same light control signal, that is, the duty cycle of the light control signal is the same. In the embodiment of the present invention, the duty cycle of the light control signal corresponding to the first preset display brightness in which the first power supply voltage changes is determined in advance, and the duty cycle of the light control signal corresponding to the first preset display brightness level is determined according to the duty cycle of the light control signal corresponding to the first preset display brightness level, so that the duty cycle of the light control signal corresponding to the current display brightness level can compensate for the brightness change caused by the change of the first power supply voltage, so that the brightness of different display brightness levels changes continuously, avoiding brightness jump when dragging the brightness bar, avoiding screen flickering, and improving the display effect of the display panel.

[0069] Based on the above embodiments, optionally, at least two first preset display brightness levels include the maximum display brightness level of the display panel, and each display brightness level at which the first power supply voltage changes relative to the previous display brightness level; or, at least two first preset display brightness levels include the maximum display brightness level of the display panel, and the minimum display brightness level at which the first power supply voltage changes relative to the previous display brightness level.

[0070] Specifically, the minimum display brightness level at which the first power supply voltage changes relative to the previous display brightness level is the minimum display brightness level among all display brightness levels at which the first power supply voltage changes relative to the previous display brightness level. When at least two first preset display brightness levels include the maximum display brightness level of the display panel and the minimum display brightness level at which the first power supply voltage changes relative to the previous display brightness level, when determining the duty cycle corresponding to the current display brightness level based on the maximum display brightness level and the minimum display brightness level at which the first power supply voltage changes relative to the previous display brightness level, the determination method is simpler, and exemplary, it can be determined by direct interpolation.

[0071] At least two first preset display brightness levels include the maximum display brightness level of the display panel, and at each display brightness level at which the first power supply voltage changes relative to the previous display brightness level, the number of first preset display brightness levels is multiple, and the duty cycle corresponding to the current display brightness level can be determined based on the duty cycles corresponding to multiple first preset display brightness levels, or the duty cycle corresponding to the current display brightness level can be determined based on the duty cycles corresponding to two first preset display brightness levels adjacent to the current display brightness level, so that the determined duty cycle is more accurate and can better compensate for the brightness change of the current display brightness level caused by the change in the first power supply voltage.

[0072] Optionally, the display brightness level is set to a display brightness level at which the first power supply voltage changes. Exemplarily, the display brightness can be set to a minimum display brightness level at which the first power supply voltage changes relative to a previous display brightness level. Exemplarily, the maximum display brightness corresponding to the display brightness level is set to be greater than or equal to 1200 nit.

[0073] On the basis of the above embodiment, optionally, determining the duty cycle of the light control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty cycles of the light control signals corresponding to at least two predetermined first preset display brightness levels, includes:

[0074] According to the currently used display brightness level and the duty ratios of the light control signal corresponding to the predetermined at least two first preset display brightness levels, the duty ratio of the light control signal corresponding to the currently used display brightness level is determined by an interpolation algorithm.

[0075] Specifically, the interpolation algorithm may include linear interpolation or nonlinear interpolation. Exemplarily, the interpolation algorithm may be linear interpolation, which may increase the operation speed and the driving speed.

[0076] When the currently used display brightness level is equal to a first preset display brightness level, the duty cycle of the light control signal corresponding to the first preset display brightness level can be directly determined as the duty cycle corresponding to the current display brightness level. When the currently used display brightness level is not equal to any first preset display brightness level, the duty cycle of the light control signal corresponding to the currently used display brightness level can be determined according to an interpolation algorithm.

[0077] On the basis of the above embodiment, optionally, according to the currently used display brightness level and the duty ratios of the light control signals corresponding to the two predetermined first preset display brightness levels, determining the duty ratio of the light control signal corresponding to the currently used display brightness level by an interpolation algorithm includes:

[0078] The duty cycle of the light emitting control signal corresponding to the currently used display brightness level is determined by an interpolation algorithm according to the duty cycles of the light emitting control signals corresponding to two first preset display brightness levels adjacent to the currently used display brightness level.

[0079] Specifically, two first preset display brightness levels adjacent to the currently used display brightness level are the same as or similar to the first power supply voltage of the currently used display brightness level. According to the duty cycle of the light-emitting control signal corresponding to the two first preset display brightness levels adjacent to the currently used display brightness level, the duty cycle of the light-emitting control signal corresponding to the currently used display brightness level is determined to be more matched with the first power supply voltage corresponding to the currently used display brightness level, so that the display brightness of the currently used display brightness level and the brightness of the adjacent display brightness levels are more in a linear relationship.

[0080] On the basis of the above-mentioned embodiments, the present embodiment optimizes the driving method of the display panel, and specifically, before determining the duty cycle of the light-emitting control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty cycle of the light-emitting control signal corresponding to at least two first preset display brightness levels determined in advance, the following is added: driving the display panel to display a preset gray scale according to the initial duty cycle of the light-emitting control signal at at least two first preset display brightness levels respectively; obtaining the first initial display brightness of the display panel at at least two first preset display brightness levels respectively; determining the duty cycle of the light-emitting control signal corresponding to each first preset display brightness level according to the first initial display brightness and the target brightness corresponding to each first preset display brightness level. Figure 3 is a flow chart of another display panel compensation method provided by an embodiment of the present invention, referring to Figure 3 , the compensation method of the display panel includes:

[0081] S101 . Drive a display panel to display a picture with a preset gray scale according to an initial duty cycle of a light emitting control signal at at least two first preset display brightness levels.

[0082] Specifically, the initial duty cycle is the duty cycle of the light control signal corresponding to the first preset display brightness level initially set by the display panel, and the initial duty cycles of all first preset display brightness levels may be the same. The preset grayscale may be any grayscale, and illustratively, the preset grayscale may be the maximum grayscale of the display panel, for example, the preset grayscale may be 255 grayscales.

[0083] S102: Obtain first initial display brightness of the display panel at at least two first preset display brightness levels respectively.

[0084] Specifically, when each first preset display brightness level displays a preset gray scale, an optical device is used to obtain the display brightness of the display panel, that is, the first initial display brightness.

[0085] S103: Determine a duty cycle of a light emitting control signal corresponding to each of the first preset display brightness levels according to the first initial display brightness and a target brightness corresponding to each of the first preset display brightness levels.

[0086] The target brightness can be set according to the display requirements of the display panel. Exemplarily, the target brightness can be determined according to the display brightness corresponding to the display brightness level adjacent to the first preset display brightness level, and the display panel can be driven to display a preset gray scale according to the initial duty cycle of the light emitting control signal at the display brightness level adjacent to the first preset display brightness level, and the display brightness of the display brightness level adjacent to the first preset display brightness level is obtained, and the target brightness is determined according to the display brightness.

[0087] According to the first initial display brightness and the target brightness corresponding to each first preset display brightness level, the duty cycle of the light control signal corresponding to each first preset display brightness level is determined. The compensation value of the duty cycle of the light control signal corresponding to each first preset display brightness level can be determined according to the brightness difference between the first initial display brightness and the corresponding target brightness, and then the duty cycle of the light control signal corresponding to the first preset display brightness level is determined according to the initial duty cycle and the compensation value of the duty cycle. Exemplarily, the greater the brightness difference, the greater the compensation value of the duty cycle, and the smaller the brightness difference, the smaller the compensation value of the duty cycle.

[0088] S110: Determine the display brightness level currently used by the display panel.

[0089] S120. If the currently used display brightness level is greater than the set display brightness level, the duty cycle of the light control signal corresponding to the currently used display brightness level is determined according to the currently used display brightness level and the duty cycle of the light control signal corresponding to at least two first preset display brightness levels determined in advance; wherein the first preset display brightness level is greater than or equal to the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level at which the first power supply voltage changes relative to the previous display brightness level.

[0090] S130 , driving the display panel to display an image according to the duty cycle of the light emitting control signal corresponding to the currently used display brightness level.

[0091] In an embodiment of the present invention, the display panel is driven to display a preset gray scale according to the initial duty cycle of the light-emitting control signal under at least two first preset display brightness levels, and the first initial display brightness of the display panel under at least two first preset display brightness levels is obtained respectively. The duty cycle of the light-emitting control signal corresponding to each first preset display brightness level is determined according to the first initial display brightness and the target brightness corresponding to each first preset display brightness level. The determined duty cycle can compensate for the brightness change caused by the change of the first power supply voltage, and the duty cycle corresponding to the current display brightness level determined according to the duty cycle corresponding to the first preset display brightness level can better compensate for the brightness change caused by the change of the first power supply voltage, thereby avoiding screen flickering when dragging the brightness bar, and improving the display effect of the display panel.

[0092] On the basis of the above-mentioned embodiment, this embodiment optimizes the method for determining the duty cycle of the light emitting control signal corresponding to the first preset display brightness level.

[0093] Figure 4 is a flow chart of another display panel compensation method provided by an embodiment of the present invention, referring to Figure 3 and Figure 4 , with S103, determining the duty cycle of the light-emitting control signal corresponding to each first preset display brightness level according to the first initial display brightness and the target brightness corresponding to each first preset display brightness level, being optimized as follows: S1031, determining the brightness difference between the first initial display brightness and the target brightness corresponding to each first preset display brightness level; S1032, determining the duty cycle compensation value corresponding to each first preset display brightness level according to the brightness difference and a pulse width parameter; wherein the pulse width parameter is the duty cycle of the light-emitting control signal corresponding to a unit brightness; S1033, determining the duty cycle of the light-emitting control signal corresponding to each first preset display brightness level according to the initial duty cycle of the light-emitting control signal and the duty cycle compensation value corresponding to each first preset display brightness level.

[0094] refer to Figure 4 , after optimization, the compensation method of the display panel includes:

[0095] S101 . Drive a display panel to display a picture with a preset gray scale according to an initial duty cycle of a light emitting control signal at at least two first preset display brightness levels.

[0096] S102: Obtain first initial display brightness of the display panel at at least two first preset display brightness levels respectively.

[0097] S1031: Determine a brightness difference between the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels.

[0098] Specifically, the brightness difference is determined by subtracting each initial display brightness from the corresponding target brightness.

[0099] S1032. Determine a duty cycle compensation value corresponding to each of the first preset display brightness levels according to the brightness difference and the pulse width parameter; wherein the pulse width parameter is the brightness corresponding to a unit duty cycle of the light emitting control signal.

[0100] Specifically, the duty cycle compensation value may be determined according to the quotient of the brightness difference and the pulse width parameter.

[0101] S1033: Determine the duty cycle of the light emitting control signal corresponding to each of the first preset display brightness levels according to the initial duty cycle of the light emitting control signal and the duty cycle compensation value corresponding to each of the first preset display brightness levels.

[0102] Specifically, the initial duty cycle and the duty cycle compensation value can be added to obtain the duty cycle of the light emitting control signal corresponding to the first preset display brightness level. Exemplarily, the two first preset display brightness levels are A1 and A2, respectively. The first power supply voltage ELVDD corresponding to A1 is 3.0V, and the first power supply voltage ELVDD corresponding to A2 is 2.9V. The initial duty cycle of A1 is Aduty, the initial duty cycle of A2 is Bduty, the initial display brightness of A1 is La, and the initial display brightness of A2 is Lb. The brightness difference of Lb relative to the target brightness is △L, because: △L=K*△Duty, where K is the pulse width parameter, △Duty is the duty cycle compensation value of A2, the duty cycle of A2 is Bduty+△Duty, A1 is the maximum display brightness level of the display panel, and the duty cycle of A1 is equal to the initial duty cycle Aduty.

[0103] S110: Determine the display brightness level currently used by the display panel.

[0104] S120. If the currently used display brightness level is greater than the set display brightness level, the duty cycle of the light control signal corresponding to the currently used display brightness level is determined according to the currently used display brightness level and the duty cycle of the light control signal corresponding to at least two first preset display brightness levels determined in advance; wherein the first preset display brightness level is greater than or equal to the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level at which the first power supply voltage changes relative to the previous display brightness level.

[0105] Specifically, the duty cycle corresponding to the current display brightness level is determined by interpolation of Aduty and Bduty+△Duty.

[0106] S130 , driving the display panel to display an image according to the duty cycle of the light emitting control signal corresponding to the currently used display brightness level.

[0107] The embodiment of the present invention determines the brightness difference between the first initial display brightness and the target brightness corresponding to each first preset display brightness level, determines the duty cycle compensation value corresponding to each first preset display brightness level according to the brightness difference and the pulse width parameter, and determines the duty cycle of the light-emitting control signal corresponding to each first preset display brightness level according to the initial duty cycle of the light-emitting control signal and the duty cycle compensation value corresponding to each first preset display brightness level, so that the determined duty cycle compensation value is more accurate, and the determined duty cycle corresponding to the first preset display brightness level is more accurate, so that the duty cycle corresponding to the current display brightness level determined according to the duty cycle corresponding to the first preset display brightness level is more accurate, and the brightness change caused by the change of the first power supply voltage can be better compensated, thereby avoiding the brightness jump of the display panel when the brightness bar is dragged.

[0108] Optionally, different display brightness levels correspond to different pulse width parameters.

[0109] Specifically, since the driving voltage at the same gray scale is different for different display brightness levels, the brightness changes differently when the duty cycle changes by the same value, and therefore the pulse width changes corresponding to the unit brightness change are different. Therefore, by setting different pulse width parameters corresponding to different display brightness levels, the duty cycle compensation value determined according to the brightness difference and the pulse width parameters is more accurate, which can better compensate for the brightness change.

[0110] Optionally, when the first preset display brightness level is the maximum display brightness level of the display panel, the target brightness of the first preset display brightness level is equal to the first initial display brightness. The duty cycle used by the first preset display brightness level is the initial duty cycle.

[0111] Figure 5 is a flow chart of another display panel compensation method provided by an embodiment of the present invention, referring to Figure 3 and Figure 5 Based on the above embodiment, the embodiment of the present invention adds a method for determining the target brightness before S103, that is, adding S104-S106. Figure 5 , the compensation method of the optimized display panel includes the following steps:

[0112] S101 . Drive a display panel to display a picture with a preset gray scale according to an initial duty cycle of a light emitting control signal at at least two first preset display brightness levels.

[0113] S102: Obtain first initial display brightness of the display panel at at least two first preset display brightness levels respectively.

[0114] S104. Drive the display panel to display a picture with a preset grayscale according to the initial duty cycle of the light emitting control signal at at least two second preset display brightness levels; wherein each of the second preset display brightness levels is adjacent to a first preset display brightness level.

[0115] S105 , respectively obtaining a second initial display brightness of the display panel at each second preset display brightness level.

[0116] S106: Determine a target brightness corresponding to the first preset display brightness level according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level.

[0117] Specifically, each first preset display brightness level may include one or two adjacent second preset display brightness levels. The second preset display brightness levels adjacent to the first preset display brightness level include at least one second preset display brightness level that is smaller than the first preset display brightness level, and the first power supply voltage corresponding to the second preset display brightness level and the first preset display brightness level adjacent to the first preset display brightness level is different, that is, the first initial display brightness of the first display brightness level jumps relative to the second initial display brightness of the second preset display brightness level.

[0118] The target brightness is determined based on the second initial display brightness of the second preset display brightness level adjacent to the first preset display brightness level. The second initial display brightness can be directly determined as the target brightness, or the average of the second initial display brightness of two second preset display brightness levels adjacent to the first preset display brightness level can be determined as the target brightness.

[0119] S103: Determine a duty cycle of a light emitting control signal corresponding to each of the first preset display brightness levels according to the first initial display brightness and a target brightness corresponding to each of the first preset display brightness levels.

[0120] S110: Determine the display brightness level currently used by the display panel.

[0121] S120. If the currently used display brightness level is greater than the set display brightness level, the duty cycle of the light control signal corresponding to the currently used display brightness level is determined according to the currently used display brightness level and the duty cycle of the light control signal corresponding to at least two first preset display brightness levels determined in advance; wherein the first preset display brightness level is greater than or equal to the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level at which the first power supply voltage changes relative to the previous display brightness level.

[0122] S130 , driving the display panel to display an image according to the duty cycle of the light emitting control signal corresponding to the currently used display brightness level.

[0123] The embodiment of the present invention drives the display panel to display a preset grayscale according to the initial duty cycle of the light control signal at at least two second preset display brightness levels respectively; obtains the second initial display brightness of the display panel at each second preset display brightness level respectively, and determines the target brightness corresponding to the first preset display brightness level according to the second initial display brightness of the second preset display brightness level adjacent to the first preset display brightness level, so that the target brightness of each first preset display brightness level is close to the brightness of the adjacent display brightness level, so that the duty cycle determined according to the target brightness can better compensate for the brightness jump between the first preset display brightness level and the adjacent display brightness level. Therefore, the duty cycle corresponding to the current display brightness level determined according to the duty cycle corresponding to the first preset display brightness level can better compensate for the brightness change caused by the change of the first power supply voltage, and avoid the brightness jump when dragging the brightness bar.

[0124] On the basis of the above embodiment, this embodiment further optimizes the method for determining the target brightness. Specifically, according to the second initial display brightness of the second preset display brightness level adjacent to the first preset display brightness level, the target brightness corresponding to the first preset display brightness level is optimized as follows:

[0125] determining a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level as a target brightness corresponding to the first preset display brightness level, wherein the first power supply voltage corresponding to the second preset display brightness level adjacent to the first preset display brightness level and the first preset display brightness level is different; or

[0126] The average of the second initial display brightness of two second preset display brightness levels adjacent to the first preset display brightness level is determined as the target brightness corresponding to the first preset display brightness level; wherein, among the two second preset display brightness levels adjacent to the first preset display brightness level, one second preset display brightness level is greater than the first preset display brightness level, and one second preset display brightness level is less than the first preset display brightness level.

[0127] Specifically, refer to Figure 1, if the DBV corresponding to point A is a first preset display brightness level, and the second preset display brightness level adjacent to point A is different from the first power supply voltage of point A, the second display brightness level adjacent to point A is the display brightness level before point A, and the second initial display brightness of the display brightness level before point A is determined as the target brightness. The compensation pulse width value of point A is determined according to the difference between the first initial display brightness of point A and the target brightness. After compensation, the brightness of point A is similar to or the same as the brightness of the display brightness level before point A, and the brightness is continuous without jumps. Figure 6 This is the relationship curve between the display brightness level and brightness after compensation, refer to Figure 6 When the duty cycle of the light emitting control signal determined in this embodiment is used to drive the display panel to display a picture of a preset gray scale, the brightness changes linearly with the change of DBV, thereby avoiding the screen flickering when dragging the brightness bar.

[0128] refer to Figure 1 , if the DBV corresponding to A is a first preset display brightness level, point A can be set to have two adjacent second preset display brightness levels, one located before point A and one located after point A, and the average of the second initial display brightness corresponding to the two second preset display brightness levels can be calculated, and the average is determined as the target brightness. The average of the second initial display brightness of the two second preset display brightness levels adjacent to the first preset display brightness level is determined as the target brightness corresponding to the first preset display brightness level, so that the display brightness of the first preset display brightness level after compensation is close to the brightness of the display brightness levels before and after it, and the brightness change is more continuous, which can further avoid brightness jumps when dragging the brightness bar.

[0129] On the basis of the above embodiment, this embodiment further optimizes the method for determining the target brightness, and specifically optimizes it so that the target brightness can be determined according to the display brightness of multiple display panels.

[0130] Optionally, under at least two second preset display brightness levels, driving the display panel to display a preset gray scale according to the initial duty cycle of the light emitting control signal comprises:

[0131] According to the initial duty cycle of the light emitting control signal, the plurality of display panels are driven to display a preset gray scale at at least two second preset display brightness levels.

[0132] Determining a target brightness corresponding to the first preset display brightness level according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level includes:

[0133] for each display panel, determining an initial target brightness corresponding to the first preset display brightness level of the display panel according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level;

[0134] The target brightness is determined according to an initial target brightness corresponding to the first preset display brightness level of the plurality of display panels.

[0135] Specifically, 20 or more display panels of the same model may be selected, and for each display panel, an initial duty cycle is used to drive the display panel to display a preset grayscale at a second preset display brightness level, a second initial display brightness of each second preset display brightness level is obtained, and an initial target brightness of each first preset display brightness level is determined according to the second initial display brightness. For the same first preset display brightness level, a target brightness corresponding to the first preset display brightness level is determined according to the initial target brightness of the first preset display brightness level of all display panels.

[0136] This embodiment determines the final target brightness according to the initial target brightness determined by the multiple display panels, so that the determined target brightness can be applicable to multiple display panels of the same model, thereby achieving compensation for the multiple display panels and improving the compensation speed.

[0137] Optionally, determining the target brightness according to the initial target brightness corresponding to the first preset display brightness level of the plurality of display panels includes:

[0138] The target brightness is determined according to the average of the initial target brightnesses corresponding to the first preset display brightness levels of the plurality of display panels. This arrangement can reduce the difficulty of calculation and improve the calculation speed.

[0139] The embodiment of the present invention further provides a driving device for a display panel. Figure 7 is a schematic diagram of a driving device for a display panel provided by an embodiment of the present invention, with reference to Figure 7 , the driving device of the display panel includes:

[0140] A display brightness level determination module 210, used to determine the display brightness level currently used by the display panel;

[0141] The duty ratio determination module 220 is used to determine the duty ratio of the light control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty ratios of the light control signals corresponding to at least two first preset display brightness levels determined in advance, if the currently used display brightness level is greater than the set display brightness level; wherein the first preset display brightness level is greater than the set display brightness level;

[0142] The driving module 230 is used to drive the display panel to display an image according to the duty cycle of the light control signal corresponding to the currently used display brightness level.

[0143] Optionally, the duty cycle determining module 220 is specifically configured to:

[0144] According to the currently used display brightness level and the duty ratios of the light control signal corresponding to the predetermined at least two first preset display brightness levels, the duty ratio of the light control signal corresponding to the currently used display brightness level is determined by an interpolation algorithm.

[0145] Optionally, the duty cycle determining module 220 is specifically configured to:

[0146] The duty cycle of the light emitting control signal corresponding to the currently used display brightness level is determined by an interpolation algorithm according to the duty cycles of the light emitting control signals corresponding to two first preset display brightness levels adjacent to the currently used display brightness level.

[0147] Optionally, the interpolation algorithm includes linear interpolation.

[0148] Optionally, the driving device further comprises:

[0149] A first driving module, configured to drive the display panel to display a picture with a preset gray scale according to an initial duty cycle of the light control signal at at least two first preset display brightness levels before determining the duty cycle of the light control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty cycles of the light control signal corresponding to at least two first preset display brightness levels determined in advance;

[0150] A first initial brightness acquisition module, used to respectively acquire a first initial display brightness of the display panel at at least two first preset display brightness levels;

[0151] The first duty cycle determining module is used to determine the duty cycle of the light emitting control signal corresponding to each of the first preset display brightness levels according to the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels.

[0152] Optionally, the first duty cycle determining module includes:

[0153] a brightness difference determining unit, configured to determine a brightness difference between the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels;

[0154] A duty cycle compensation value determination unit, configured to determine a duty cycle compensation value corresponding to each of the first preset display brightness levels according to the brightness difference and a pulse width parameter; wherein the pulse width parameter is the brightness corresponding to a unit duty cycle of the light emitting control signal;

[0155] The duty cycle determining unit is used to determine the duty cycle of the light emitting control signal corresponding to each first preset display brightness level according to the initial duty cycle of the light emitting control signal and the duty cycle compensation value corresponding to each first preset display brightness level.

[0156] Optionally, different display brightness levels correspond to different pulse width parameters.

[0157] Optionally, when the first preset display brightness level is the maximum display brightness level of the display panel, the target brightness of the first preset display brightness level is equal to the first initial display brightness.

[0158] Optionally, the driving device further comprises:

[0159] a second driving module, configured to drive the display panel to display a picture with a preset gray scale according to the initial duty cycle of the light control signal at at least two second preset display brightness levels, before determining the duty cycle of the light control signal corresponding to each of the first preset display brightness levels according to the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels; wherein each of the second preset display brightness levels is adjacent to a first preset display brightness level;

[0160] A second initial brightness acquisition module, used to respectively acquire a second initial display brightness of the display panel at each second preset display brightness level;

[0161] The target brightness determination module is used to determine the target brightness corresponding to the first preset display brightness level according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level.

[0162] Optionally, the target brightness determination module is specifically used for:

[0163] determining a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level as a target brightness corresponding to the first preset display brightness level, wherein the first power supply voltage corresponding to the second preset display brightness level adjacent to the first preset display brightness level and the first preset display brightness level is different; or

[0164] The average of the second initial display brightness of two second preset display brightness levels adjacent to the first preset display brightness level is determined as the target brightness corresponding to the first preset display brightness level; wherein, among the two second preset display brightness levels adjacent to the first preset display brightness level, one second preset display brightness level is greater than the first preset display brightness level, and one second preset display brightness level is less than the first preset display brightness level.

[0165] Optionally, the second driving module is specifically used for:

[0166] According to the initial duty cycle of the light emitting control signal, driving the plurality of display panels to display a preset gray scale at at least two second preset display brightness levels;

[0167] The target brightness determination module specifically includes:

[0168] an initial target brightness determination unit, configured to determine, for each display panel, an initial target brightness corresponding to the first preset display brightness level of the display panel according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level;

[0169] A target brightness determination unit is used to determine the target brightness according to the initial target brightness corresponding to the first preset display brightness level of the plurality of display panels.

[0170] Optionally, the target brightness determination unit is specifically used for:

[0171] The target brightness is determined according to an average value of initial target brightnesses corresponding to the first preset display brightness levels of the plurality of display panels.

[0172] The display panel driving device provided in the embodiment of the present invention and the display panel driving method provided in any embodiment of the present invention belong to the same inventive concept and have corresponding beneficial effects. For technical details not detailed in this embodiment, please refer to the display panel driving method provided in any embodiment of the present invention.

[0173] An embodiment of the present invention further provides a display device, Figure 8 is a schematic diagram of a display device provided by an embodiment of the present invention, with reference to Figure 8 The 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 an electronic device such as a mobile phone or a tablet.

[0174] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0175] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for driving a display panel, characterized in that: include: Determine the display brightness level currently used by the display panel; If the currently used display brightness level is greater than the set display brightness level, the duty cycle of the light control signal corresponding to the currently used display brightness level is determined according to the currently used display brightness level and the duty cycle of the light control signal corresponding to at least two first preset display brightness levels determined in advance; wherein the first preset display brightness level is greater than or equal to the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level at which the first power supply voltage changes relative to the previous display brightness level; and the display panel is driven to display a picture according to the duty cycle of the light control signal corresponding to the currently used display brightness level.

2. The method for driving a display panel according to claim 1, wherein: Determining the duty cycle of the light control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty cycles of the light control signals corresponding to at least two predetermined first preset display brightness levels, comprising: Determining the duty cycle of the light control signal corresponding to the currently used display brightness level by an interpolation algorithm according to the currently used display brightness level and the duty cycles of the light control signals corresponding to the predetermined at least two first preset display brightness levels; Preferably, determining the duty cycle of the light control signal corresponding to the currently used display brightness level by an interpolation algorithm according to the currently used display brightness level and the duty cycle of the light control signal corresponding to the predetermined at least two first preset display brightness levels includes: The duty cycle of the light emitting control signal corresponding to the currently used display brightness level is determined by an interpolation algorithm according to the duty cycles of the light emitting control signals corresponding to two first preset display brightness levels adjacent to the currently used display brightness level.

3. The method for driving a display panel according to claim 1, wherein: Before determining the duty ratio of the light control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty ratios of the light control signal corresponding to at least two predetermined first preset display brightness levels, the method further includes: driving the display panel to display a picture with a preset gray scale according to an initial duty cycle of the light emitting control signal at at least two first preset display brightness levels; Respectively obtaining first initial display brightness of the display panel at at least two first preset display brightness levels; The duty cycle of the light emitting control signal corresponding to each of the first preset display brightness levels is determined according to the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels.

4. The method for driving a display panel according to claim 3, wherein: Determining a duty cycle of a light emitting control signal corresponding to each of the first preset display brightness levels according to the first initial display brightness and a target brightness corresponding to each of the first preset display brightness levels includes: Determine a brightness difference between the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels; Determining a duty cycle compensation value corresponding to each first preset display brightness level according to the brightness difference and the pulse width parameter; wherein the pulse width parameter is the brightness corresponding to a unit duty cycle of the light emitting control signal; determining the duty cycle of the light emitting control signal corresponding to each of the first preset display brightness levels according to the initial duty cycle of the light emitting control signal and the duty cycle compensation value corresponding to each of the first preset display brightness levels; Preferably, different display brightness levels correspond to different pulse width parameters; Preferably, when the first preset display brightness level is the maximum display brightness level of the display panel, the target brightness of the first preset display brightness level is equal to the first initial display brightness.

5. The method for driving a display panel according to claim 3, wherein: Before determining the duty cycle of the light emitting control signal corresponding to each of the first preset display brightness levels according to the first initial display brightness and the target brightness corresponding to each of the first preset display brightness levels, the method further includes: Driving the display panel to display a picture with a preset grayscale according to the initial duty cycle of the light emitting control signal at at least two second preset display brightness levels respectively; wherein each of the second preset display brightness levels is adjacent to a first preset display brightness level; respectively obtaining a second initial display brightness of the display panel at each second preset display brightness level; determining a target brightness corresponding to the first preset display brightness level according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level; Preferably, determining the target brightness corresponding to the first preset display brightness level according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level includes: determining a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level as a target brightness corresponding to the first preset display brightness level, wherein the first power supply voltage corresponding to the second preset display brightness level adjacent to the first preset display brightness level and the first preset display brightness level is different; or The average of the second initial display brightness of two second preset display brightness levels adjacent to the first preset display brightness level is determined as the target brightness corresponding to the first preset display brightness level; wherein, among the two second preset display brightness levels adjacent to the first preset display brightness level, one second preset display brightness level is greater than the first preset display brightness level, and one second preset display brightness level is less than the first preset display brightness level.

6. The method for driving a display panel according to claim 5, characterized in that: At least two second preset display brightness levels, driving the display panel to display a preset gray scale according to an initial duty cycle of the light emitting control signal, comprising: According to the initial duty cycle of the light emitting control signal, driving the plurality of display panels to display a preset gray scale at at least two second preset display brightness levels; Determining a target brightness corresponding to the first preset display brightness level according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level includes: for each display panel, determining an initial target brightness corresponding to the first preset display brightness level of the display panel according to a second initial display brightness of a second preset display brightness level adjacent to the first preset display brightness level; determining the target brightness according to the initial target brightness corresponding to the first preset display brightness level of the plurality of display panels; Preferably, determining the target brightness according to the initial target brightness corresponding to the first preset display brightness level of the plurality of display panels includes: The target brightness is determined according to an average value of initial target brightnesses corresponding to the first preset display brightness levels of the plurality of display panels.

7. The method for driving a display panel according to claim 1, wherein: The at least two first preset display brightness levels include the maximum display brightness level of the display panel, and each display brightness level at which the first power supply voltage changes relative to a previous display brightness level; or, the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and a minimum display brightness level at which the first power supply voltage changes relative to a previous display brightness level; Preferably, the set display brightness level is a display brightness level at which the first power supply voltage changes.

8. The method for driving a display panel according to claim 1, wherein: The display panel includes a plurality of sub-pixels, each of which includes a light-emitting unit; an anode of the light-emitting unit is used to receive the first power supply voltage.

9. A driving device for a display panel, characterized in that: include: A display brightness level determination module, used to determine the display brightness level currently used by the display panel; a duty cycle determination module, configured to determine the duty cycle of the light control signal corresponding to the currently used display brightness level according to the currently used display brightness level and the duty cycles of the light control signals corresponding to at least two first preset display brightness levels determined in advance, if the currently used display brightness level is greater than the set display brightness level; wherein the first preset display brightness level is greater than the set display brightness level, and the at least two first preset display brightness levels include the maximum display brightness level of the display panel, and at least one display brightness level at which the first power supply voltage changes relative to the previous display brightness level; The driving module is used to drive the display panel to display an image according to the duty cycle of the light emitting control signal corresponding to the currently used display brightness level.

10. A display device, characterized in that: A display panel and a driving device for the display panel as claimed in claim 9.

Images