Driving method, driving device and display device of display panel

Abstract

The application discloses a driving method, a driving device and a display device of a display panel. The driving method comprises the following steps: determining a current display brightness level of the display panel; determining the pulse width of a first light-emitting control pulse and the pulse width of a second light-emitting control pulse in a light-emitting stage in each driving period according to the current display brightness level; wherein each light-emitting stage comprises one first light-emitting control pulse and at least one second light-emitting control pulse; with the increase of the display brightness level, the pulse width of the first light-emitting control pulse gradually increases, the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse gradually increase, and the minimum pulse width of the first light-emitting control pulse is greater than or equal to the first pulse width; and driving the display panel to display a picture according to the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse. The application can effectively improve the problems of brightness inversion and picture flicker when dragging a brightness bar, and improve 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, driving device, and display device for a display panel. Background Technology

[0002] As organic light-emitting diode (OLED) displays become more widely used, they are gradually being applied in mobile phones, tablets, and laptops. However, the display effect of existing display panels is not good. Summary of the Invention

[0003] This invention provides a driving method, driving device, and display device for a display panel, which can effectively improve the problem of brightness reversal and screen flickering when dragging the brightness bar, and improve the display effect of the display panel.

[0004] According to one aspect of the present invention, a method for driving a display panel is provided, comprising:

[0005] Determine the current display brightness level of the display panel;

[0006] The pulse widths of the first and second light-emitting control pulses in each driving cycle are determined based on the current display brightness level. Each light-emitting stage includes one first light-emitting control pulse and at least one second light-emitting control pulse. As the display brightness level increases, the pulse width of the first light-emitting control pulse gradually increases, the sum of the pulse widths of the first and second light-emitting control pulses gradually increases, and the minimum pulse width of the first light-emitting control pulse is greater than or equal to the first pulse width.

[0007] The display panel is driven to display the image based on the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse.

[0008] Optionally, the first light emission control pulse is the first light emission control pulse in the light emission stage.

[0009] Optionally, when the display brightness level is less than or equal to the first preset brightness level, the pulse width of the first light emission control pulse for each display brightness level is equal to the first pulse width, and the pulse width of the second light emission control pulse gradually increases as the display brightness level increases.

[0010] When the display brightness level is greater than the first preset brightness level, as the display brightness level increases, the pulse width of the first light emission control pulse gradually increases, the pulse width of the second light emission control pulse gradually increases, and the pulse width of the first light emission control pulse is greater than or equal to the first pulse width.

[0011] Optionally, when the display brightness level is less than or equal to the first preset brightness level, the minimum pulse width of the second light emission control pulse is less than the first pulse width;

[0012] Optionally, when the display brightness level is less than or equal to the second preset brightness level, the pulse width of the second light emission control pulse is equal to the second pulse width, the second pulse width is less than the first pulse width, and the second preset brightness level is less than the first preset brightness level;

[0013] When the display brightness level is greater than the second preset brightness level, the pulse width of the second light emission control pulse gradually increases as the display brightness level increases.

[0014] Optionally, when the display brightness level is greater than the first preset brightness level, the pulse width of the first light emission control pulse increases stepwise as the display brightness level increases;

[0015] Optionally, the emission stage includes a first emission control pulse and at least three second emission control pulses;

[0016] Optionally, when the display brightness level is greater than the second preset brightness level, the pulse width of each second light emission control pulse increases stepwise as the display brightness level increases.

[0017] Optionally, the maximum pulse width of the first light emission control pulse and the second light emission control pulse are the same;

[0018] The pulse width of the first light emission control pulse increases by the same amount each time, and / or the pulse width of the second light emission control pulse increases by the same amount each time;

[0019] Optionally, the pulse width of the first light emission control pulse increases by the same amount each time as the pulse width of the second light emission control pulse increases by the same amount each time.

[0020] According to another aspect of the present invention, a driving device for a display panel is provided, comprising:

[0021] The brightness level determination module is used to determine the current display brightness level of the display panel;

[0022] The pulse width determination module is used to determine the pulse width of the first light emission control pulse and the pulse width of the second light emission control pulse in each driving cycle according to the current display brightness level; wherein, each light emission stage includes a first light emission control pulse and at least one second light emission control pulse; as the display brightness level increases, the pulse width of the first light emission control pulse gradually increases, the sum of the pulse widths of the first light emission control pulse and the second light emission control pulse gradually increases, and the minimum pulse width of the first light emission control pulse is greater than or equal to the first pulse width;

[0023] The driving module is used to drive the display panel to display the image according to the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse.

[0024] Optionally, the first light emission control pulse is the first light emission control pulse in the light emission stage.

[0025] Optionally, when the display brightness level is less than or equal to the first preset brightness level, the pulse width of the first light emission control pulse for each display brightness level is equal to the first pulse width, and the pulse width of the second light emission control pulse gradually increases as the display brightness level increases.

[0026] When the display brightness level is greater than the first preset brightness level, as the display brightness level increases, the pulse width of the first light emission control pulse gradually increases, the pulse width of the second light emission control pulse gradually increases, and the pulse width of the first light emission control pulse is greater than or equal to the first pulse width.

[0027] According to another aspect of the present invention, a display device is provided, including a display panel and a driving device for the display panel as described in any embodiment of the present invention.

[0028] The display panel driving method provided by the technical solution of this invention includes: determining the current display brightness level of the display panel; determining the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse in each driving cycle according to the current display brightness level; wherein, each light-emitting stage includes the first light-emitting control pulse and the second light-emitting control pulse; as the display brightness level increases, the pulse width of the first light-emitting control pulse gradually increases, the sum of the pulse widths of the first and second light-emitting control pulses gradually increases, and the minimum pulse width of the first light-emitting control pulse is greater than or equal to the first pulse width; driving the display panel to display an image according to the pulse widths of the first and second light-emitting control pulses. By setting the minimum pulse width of the first light-emitting control pulse to be greater than or equal to the first pulse width as the display brightness level increases, the SVM index can be improved. The gradually increasing sum of the pulse widths of the first and second light-emitting control pulses, and the gradually increasing pulse width of the first light-emitting control pulse, can ensure that while optimizing the SVM index, the brightness change of the display panel is smoother with the change of the display brightness level, avoiding brightness reversal and screen flickering when dragging the brightness bar.

[0029] 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

[0030] 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.

[0031] Figure 1 This is a schematic diagram of a brightness gradient curve in the prior art.

[0032] Figure 2 This is a flowchart of a display panel driving method provided in an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of a brightness gradient curve provided in an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of a light emission control pulse provided in an embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of another type of light emission control pulse provided in an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of the display brightness level and the pulse width of the light emission control pulse provided in an embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of another display brightness level and the pulse width of the light emission control pulse provided in an embodiment of the present invention. Figure 8 This is a schematic diagram of a driving device for a display panel provided in an embodiment of the present invention.

[0038] Figure 9 This is a schematic diagram of a display device provided in an embodiment of the present invention. Detailed Implementation

[0039] 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.

[0040] It should be noted that the terms "first," "second," etc., used in 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 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.

[0041] To facilitate understanding of the embodiments of this application, this application first provides a detailed explanation of the problems existing in the related technologies:

[0042] With the increasing prevalence of Organic Light Emitting Diode (OLED) displays, they are gradually being used in display devices such as mobile phones, tablets, and laptops. As the power consumption requirements of OLED screens become increasingly stringent, Low Temperature Polycrystalline Oxide (LTPO) technology, supporting low refresh rates, has emerged. To ensure the display quality of LTPO screens, a new flicker confirmation metric has been developed: the Stroboscopic Effect Visibility Measure (SVM). In SVM testing, wider, darker, and sparser black bars indicate stronger flicker, and vice versa.

[0043] Each driving cycle of the display panel includes a light-emitting stage, and each light-emitting stage includes at least two light-emitting control pulses. The brightness of the sub-pixels can be adjusted by regulating the pulse width of the light-emitting control pulses. The inventors discovered through research that in related technologies, the pulse width of each light-emitting control pulse is limited at the low brightness display brightness level (DBV) of some display panels to improve the SVM index, but this leads to screen flickering when the brightness bar is dragged to change the display brightness level.

[0044] Table 1

[0045]

[0046] Table 1 shows the pulse width variation of the light emission control pulses for multiple display brightness levels. As shown in Table 1, in related technologies, the pulse width of each light emission control pulse is limited for some low-brightness display brightness levels of the display panel. For example, the display panel is divided into 1204 display brightness levels, i.e., 1204 DBVs. The width of each light emission control pulse is fixed for display brightness levels 1-300. This causes the pulse width of the first light emission control pulse for some high-brightness display brightness levels to be smaller than the pulse width of the first light emission control pulse for some low-brightness display brightness levels. For example, in display brightness levels 301 and 302, the pulse width of the first light emission control pulse is 40μs, while the pulse width of the first light emission control pulse for display brightness levels 1-300 is 50μs. This causes a brightness reversal in display brightness levels 301 and 302 (i.e., at the same gray level, the brightness of display brightness levels 301 and 302 is less than the brightness of display brightness level 300), resulting in screen flickering when the brightness bar is dragged.

[0047] Figure 1 This is a schematic diagram of a brightness gradient curve in existing technology, such as... Figure 1 As shown, the brightness gradient curve will have a reversal point; the circled area indicates the reversal point. Figure 1 The horizontal axis represents DBV, which is the display brightness level, and the vertical axis represents the brightness change between adjacent DBVs, specifically ΔL / L, where ΔL is the brightness change between adjacent DBVs and L is the brightness of the previous display brightness level.

[0048] To address the aforementioned problems, embodiments of the present invention provide a method for driving a display panel. Figure 2 This is a flowchart of a display panel driving method provided in an embodiment of the present invention, see reference. Figure 2 The driving methods include:

[0049] S110. Determine the current display brightness level of the display panel.

[0050] To meet the display requirements of the display panel, it typically has multiple brightness levels. The minimum brightness at each brightness level is 0, while the maximum brightness differs. The total number of grayscale levels that can be displayed is the same at each brightness level, for example, 0-255 grayscale levels. The brightness of the same grayscale level varies across different brightness levels. The brightness level can be switched by sliding the brightness bar on the screen. The current brightness level is the brightness level used by the display panel for the currently displayed image.

[0051] S120. Determine the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse in each driving cycle according to the current display brightness level; wherein, each light-emitting stage includes one first light-emitting control pulse and at least one second light-emitting control pulse; as the display brightness level increases, the pulse width of the first light-emitting control pulse gradually increases, the sum of the pulse widths of the first light-emitting control pulse and the second light-emitting control pulse gradually increases, and the minimum pulse width of the first light-emitting control pulse is greater than or equal to the first pulse width.

[0052] Each driving cycle includes an initialization phase, a data writing phase, and a light emission phase. Each light emission phase includes at least two light emission control pulses. These pulses control the light emission of sub-pixels. The wider the pulse width of the light emission control pulse, the longer the light emission duration of the sub-pixel, and the greater the brightness of the sub-pixel. By adjusting the pulse width of the light emission control pulse, the brightness of the sub-pixel can be adjusted, thereby regulating the brightness of the display panel. The number of light emission control pulses in each driving cycle can be the same across different display brightness levels. Within each driving cycle, the first light emission control pulse can be one, and the second light emission control pulse can be one, two, or more. For example, the second light emission control pulse can be three.

[0053] The pulse width of the first light-emitting control pulse is the one that has the greatest impact on the brightness of the sub-pixel during the light-emitting stage. As the display brightness level increases, the pulse width of the first light-emitting control pulse gradually increases, and this gradual increase is an overall increasing trend. For example, the gradual increase can be a step-like increase. For some adjacent display brightness levels, the pulse width of the first light-emitting control pulse can be the same. Across all display brightness levels, the pulse width of the first light-emitting control pulse generally shows an increasing trend. The sum of the pulse widths of the first and second light-emitting control pulses gradually increases, so that as the display brightness level increases, the light-emitting duration of the sub-pixel gradually increases, the light-emitting brightness of the sub-pixel gradually increases, and the display brightness of the display panel gradually increases, avoiding brightness reversal abrupt points and preventing flickering.

[0054] The minimum pulse width of the first light emission control pulse is greater than or equal to the first pulse width, which is a fixed value, for example, 50μs. The minimum pulse width of the first light emission control pulse being greater than or equal to the first pulse width can improve the SVM index. Furthermore, the gradual increase in the pulse width of the first light emission control pulse can ensure that the brightness change of the display panel is smoother with the change of the display brightness level while ensuring the optimization of the SVM index. This can avoid brightness reversal and screen flickering when dragging the brightness bar.

[0055] Figure 3 This is a schematic diagram of a brightness gradient curve provided in an embodiment of the present invention, for reference. Figure 3 , Figure 3The diagram illustrates the brightness gradient curve of the display panel as the display brightness level changes after adopting the scheme of this embodiment. Figure 3 The horizontal axis represents DBV (Degrees Per Volume), which is the display brightness level, and the vertical axis represents the brightness change between adjacent DBV values, as exemplified. The vertical axis could also be ΔL / L, where ΔL represents the brightness change between adjacent DBV values, and L represents the brightness of the previous display brightness level. (Reference) Figure 3 After adopting the solution in this embodiment, the brightness gradient curve has no inversion abrupt point. Specifically, the following table exemplarily shows the specific values ​​of the pulse width of the light emission control pulses for multiple display brightness levels, as shown in Table 2:

[0056] Table 2

[0057]

[0058] Table 2 shows the pulse width variation of the light emission control pulses for multiple display brightness levels provided in the embodiments of the present invention. As shown in Table 2, exemplarily, the first light emission control pulse is the first light emission control pulse. The light emission stage of each driving cycle may include three second light emission control pulses, namely, a second light emission control pulse, a third light emission control pulse, and a fourth light emission control pulse. When the display brightness level is in the range of 1-300, the pulse width of the first light emission control pulse is fixed at 50μs, and the pulse widths of the second, third, and fourth light emission control pulses are all fixed at 10μs. When the display brightness level is in the range of 301-344, the pulse width of the first light emission control pulse is fixed at 50μs, and the pulse widths of the second, third, and fourth light emission control pulses increase sequentially, with each increase being the same value of 4μs. When the display brightness level is in the range of 345-1204, the pulse width of the first light emission control pulse gradually increases, as do the pulse widths of the second, third, and fourth light emission control pulses. Within the display brightness level range of 1-1204, the pulse width of the first light emission control pulse gradually increases with the increase in brightness level, from 50μs to 224μs. The sum of the pulse widths of the first and second light emission control pulses gradually increases. This ensures smoother brightness changes on the display panel as the brightness level changes, while maintaining optimized SVM (Shine Visual Measurement) metrics. It also prevents brightness reversal and screen flickering issues when dragging the brightness bar.

[0059] Figure 4 This is a schematic diagram of a light-emitting control pulse provided in an embodiment of the present invention, for reference. Figure 4For example, A1 and A2 are light emission control pulse signals for different display brightness levels. Both A1 and A2 include a first light emission control pulse and a second light emission control pulse. The first light emission control pulse is the first light emission control pulse, and the second light emission control pulse may include a second light emission control pulse, a third light emission control pulse, and a fourth light emission control pulse. The display brightness level corresponding to A2 is greater than the display brightness level corresponding to A1. The display brightness level corresponding to A1 can be 300, with the first emission control pulse being 50μs, the second emission control pulse being 10μs, the third emission control pulse being 10μs, and the fourth emission control pulse being 10μs. The display brightness level corresponding to A2 can be 340, with the first emission control pulse being 50μs, the second emission control pulse being 42μs, the third emission control pulse being 42μs, and the fourth emission control pulse being 42μs. As the display brightness level increases, the sum of the pulse widths of the first and second emission control pulses gradually increases. This ensures that while optimizing the SVM index, the brightness change of the display panel is smoother with changes in the display brightness level, avoiding brightness reversal and screen flickering when dragging the brightness bar.

[0060] It should be noted that the brightness change of the display panel as the display brightness level changes as described in this embodiment refers to the brightness change of the display panel when displaying the same grayscale at different display brightness levels.

[0061] S130. Drive the display panel to display the image according to the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse.

[0062] Specifically, during the light-emitting phase of each driving cycle, a first light-emitting control pulse and a second light-emitting control pulse are sequentially input into the pixel driving circuit of the sub-pixel to make the sub-pixel emit light and the display panel display the image.

[0063] The display panel driving method provided by the technical solution of this invention includes: determining the current display brightness level of the display panel; determining the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse in each driving cycle according to the current display brightness level; wherein, each light-emitting stage includes the first light-emitting control pulse and the second light-emitting control pulse; as the display brightness level increases, the pulse width of the first light-emitting control pulse gradually increases, the sum of the pulse widths of the first and second light-emitting control pulses gradually increases, and the minimum pulse width of the first light-emitting control pulse is greater than or equal to the first pulse width; driving the display panel to display an image according to the pulse widths of the first and second light-emitting control pulses. By setting the minimum pulse width of the first light-emitting control pulse to be greater than or equal to the first pulse width as the display brightness level increases, the SVM index can be improved. The gradually increasing sum of the pulse widths of the first and second light-emitting control pulses, and the gradually increasing pulse width of the first light-emitting control pulse, can ensure that while optimizing the SVM index, the brightness change of the display panel is smoother with the change of the display brightness level, avoiding brightness reversal and screen flickering when dragging the brightness bar.

[0064] Optionally, the first light emission control pulse is the first light emission control pulse in the light emission stage.

[0065] Among them, the pulse width of the first emission control pulse has the greatest impact on the brightness of sub-pixels and the brightness of the display panel. The minimum pulse width of the first emission control pulse is fixed at the first pulse width, which can improve the SVM index. Furthermore, as the display brightness level increases, the pulse width of the first emission control pulse gradually increases. This ensures smoother brightness changes while maintaining optimized SVM index, effectively preventing brightness reversal when dragging the brightness bar and avoiding flickering issues.

[0066] Optionally, when the display brightness level is less than or equal to the first preset brightness level, the pulse width of the first light emission control pulse for each display brightness level is equal to the first pulse width, and the pulse width of the second light emission control pulse gradually increases as the display brightness level increases.

[0067] When the display brightness level is greater than the first preset brightness level, as the display brightness level increases, the pulse width of the first light emission control pulse gradually increases, the pulse width of the second light emission control pulse gradually increases, and the pulse width of the first light emission control pulse is greater than or equal to the first pulse width.

[0068] Specifically, when the display brightness level is less than or equal to the first preset brightness level, the pulse width of the first emission control pulse for each display brightness level is equal to the first pulse width. The fixed pulse width of the first emission control pulse improves the SVM index. Furthermore, by setting the pulse width of the second emission control pulse to gradually increase with the increase of the display brightness level, the sum of the pulse widths of the first and second emission control pulses gradually increases. This ensures that as the display brightness level increases, the emission duration of the sub-pixels gradually increases, the brightness of the sub-pixels gradually increases, and the brightness of the display panel gradually increases. This results in a smooth transition of the display panel brightness when the display brightness level is less than or equal to the first preset brightness level, preventing brightness reversal and screen flickering during changes in display brightness level. For example, referring to Table 2, the first preset brightness level can be a display brightness level of 344; the first pulse width can be 50μs.

[0069] When the display brightness level is greater than the first preset brightness level, the pulse width of the first light emission control pulse gradually increases as the display brightness level increases, and the pulse width of the second light emission control pulse gradually increases, ensuring that the brightness of the sub-pixels gradually increases and the brightness of the display panel gradually increases as the display brightness level increases, avoiding brightness reversal when dragging the brightness bar and avoiding screen flicker.

[0070] Optionally, when the display brightness level is less than or equal to the first preset brightness level, the minimum pulse width of the second light emission control pulse is less than the first pulse width.

[0071] in, Figure 5 This is a schematic diagram of another type of light-emitting control pulse provided in an embodiment of the present invention, see reference. Figure 5For example, A1, A2, and A3 represent light emission control pulse signals at different brightness levels. A1, A2, and A3 each include a first light emission control pulse and a second light emission control pulse. The first light emission control pulse is the first light emission control pulse, and the second light emission control pulse may include a second light emission control pulse, a third light emission control pulse, and a fourth light emission control pulse. The display brightness level corresponding to A2 can be a first preset brightness level, which can be a display brightness level of 340. The display brightness level corresponding to A3 is lower than the display brightness level corresponding to A1. The display brightness level corresponding to A1 is lower than the first preset brightness level, which can be a display brightness level of 300. The display brightness level corresponding to A3 can be a display brightness level of 1. The pulse width of the first light emission control pulse for display brightness levels A1 and A3 is equal to the first pulse width, and the minimum pulse width of the second light emission control pulse is less than the first pulse width. When the display brightness level is less than or equal to the first preset brightness level, the pulse width of the first light emission control pulse for each display brightness level is equal to the first pulse width, which can improve the SVM index. When the minimum pulse width of the second light emission control pulse is less than the first pulse width, the pulse width of the second light emission control pulse can be adjusted more when the display brightness level is less than or equal to the first preset brightness level. This gives the display panel a larger adjustment range for brightness and meets the brightness requirements of the display panel at different display brightness levels.

[0072] Optionally, when the display brightness level is less than or equal to the second preset brightness level, the pulse width of the second light emission control pulse is equal to the second pulse width, the second pulse width is less than the first pulse width, and the second preset brightness level is less than the first preset brightness level.

[0073] When the display brightness level is greater than the second preset brightness level, the pulse width of the second light emission control pulse gradually increases as the display brightness level increases.

[0074] When the display brightness level is less than or equal to the second preset brightness level, the pulse width of the first emission control pulse is equal to the first pulse width, the pulse width of the second emission control pulse is equal to the second pulse width, the second pulse width is less than the first pulse width, and both the first and second pulse widths are constant values, which can improve the SVM index. For display brightness levels less than or equal to the second preset brightness level, DC dimming can be used to adjust the brightness of different display brightness levels. That is, different display brightness levels use the same first emission control pulse and the same second emission control pulse, and by changing the driving data, the brightness at the same grayscale level varies between different display brightness levels.

[0075] When the display brightness level is greater than the second preset brightness level, as the display brightness level increases, the pulse width of the second light emission control pulse gradually increases, the light emission duration of the sub-pixel gradually increases, the brightness of the sub-pixel gradually increases, and the brightness of the display panel gradually increases. This prevents brightness reversal when dragging the brightness bar and avoids screen flickering. For example, referring to Table 2, the second preset brightness level can be a display brightness level of 300; the first pulse width can be 50μs, and the second pulse width can be 10μs.

[0076] Optionally, when the display brightness level is greater than the first preset brightness level, the pulse width of the first light emission control pulse increases stepwise as the display brightness level increases.

[0077] In this stepwise increase, each pair or more adjacent display brightness levels can be grouped together, with the pulse width of the first light emission control pulse being the same for each group of display brightness levels. As the display brightness level increases, the pulse width of the first light emission control pulse for different groups of display brightness levels gradually increases. Figure 6 This is a schematic diagram illustrating the relationship between display brightness levels and the pulse width of the light emission control pulse, provided in an embodiment of the present invention. Figure 6 An exemplary schematic diagram illustrates the step-wise increase of the pulse width of the first light-emitting control pulse. The horizontal axis represents the display brightness level, and the vertical axis represents the pulse width of the first light-emitting control pulse. The first preset brightness level can be display brightness level 344. For example, display brightness levels 344-347 constitute the first group, with a pulse width of 50μs for the first light-emitting control pulse; display brightness levels 348-351 constitute the second group, with a pulse width of 54μs for the first light-emitting control pulse; and display brightness levels 352-353 constitute the third group, with a pulse width of 58μs for the first light-emitting control pulse. When the display brightness level is greater than the first preset brightness level, the pulse width of the first light-emitting control pulse increases stepwise as the display brightness level increases. This ensures a smoother transition of brightness differences during brightness gradients, avoids brightness reversal when dragging the brightness bar, and prevents screen flickering.

[0078] For example, as shown in Table 2, the pulse width of the first emission control pulse is 50 μs at brightness level 345; 50 μs at brightness level 346; 50 μs at brightness level 347; 54 μs at brightness level 348; 54 μs at brightness level 349; 54 μs at brightness level 350; 54 μs at brightness level 351; and 58 μs at brightness level 352. As the brightness level increases, if the pulse width of the first emission control pulse remains unchanged for adjacent brightness levels, the pulse width of the second emission control pulse is increased to improve the brightness of the brightness level.

[0079] Optionally, the emission stage includes a first emission control pulse and at least three second emission control pulses.

[0080] Optionally, when the display brightness level is greater than the second preset brightness level, the pulse width of each second light emission control pulse increases stepwise as the display brightness level increases.

[0081] The stepwise increase can be a single brightness level, or a group of two or more adjacent brightness levels. The pulse width of the second light emission control pulse for each group of brightness levels is the same. As the brightness level increases, the pulse width of the second light emission control pulse for different groups of brightness levels gradually increases.

[0082] When the display brightness level is greater than the second preset brightness level, the pulse width of each second light emission control pulse increases stepwise as the display brightness level increases. Figure 7 This is a schematic diagram illustrating another display brightness level and the pulse width of the light emission control pulse provided in an embodiment of the present invention. Figure 7 An exemplary schematic diagram shows the step-wise increase of the pulse width of the second light-emitting control pulse. The horizontal axis represents the display brightness level, and the vertical axis represents the pulse width of the second light-emitting control pulse. The second preset brightness level can be display brightness level 300. For example, display brightness levels 340-342 are in the first group, and the pulse width of the second light-emitting control pulse in the second light-emitting control pulse is 42μs; display brightness level 343 is in the second group, and the pulse width of the first light-emitting control pulse is 46μs; display brightness levels 344-346 are in the third group, and the pulse width of the first light-emitting control pulse is 50μs. This ensures a smoother transition of brightness differences and avoids brightness reversal when dragging the brightness bar, thus preventing screen flickering.

[0083] For example, as shown in Table 2, at a display brightness level of 345, the pulse width of the first emission control pulse is 50 μs, the pulse width of the second emission control pulse is 50 μs, the pulse width of the third emission control pulse is 50 μs, and the pulse width of the fourth emission control pulse is 54 μs; at a display brightness level of 346, the pulse width of the first emission control pulse is 50 μs, the pulse width of the second emission control pulse is 50 μs, the pulse width of the third emission control pulse is 54 μs, and the pulse width of the fourth emission control pulse is... The pulse width of each of the four light-emitting control pulses is 54μs. At brightness level 347, the pulse widths are 50μs for the first, second, third, and fourth light-emitting control pulses. At brightness level 348, the pulse widths are also 54μs for each pulse. As the brightness level increases, if the pulse width of the second light-emitting control pulse remains constant for adjacent brightness levels, the pulse width of the first light-emitting control pulse is increased to improve the brightness of the next brightness level.

[0084] Optionally, the maximum pulse width of the first light emission control pulse and the second light emission control pulse are the same; the pulse width of the first light emission control pulse increases by the same value each time; and / or, the pulse width of the second light emission control pulse increases by the same value each time.

[0085] In this design, the pulse width of the first light-emitting control pulse increases by the same amount each time, and the pulse width of the second light-emitting control pulse increases by the same amount each time, which simplifies the light-emitting control circuit and the driving algorithm.

[0086] Optionally, the pulse width of the first light emission control pulse increases by the same amount each time as the pulse width of the second light emission control pulse increases by the same amount each time.

[0087] The pulse width of the first light-emitting control pulse increases by the same amount each time as the pulse width of the second light-emitting control pulse, which simplifies the light-emitting control circuit and the driving algorithm.

[0088] Based on the above embodiments, this invention provides a driving device for a display panel. Figure 8 This is a schematic diagram of a driving device for a display panel provided in an embodiment of the present invention, with reference to... Figure 8 The drive unit includes:

[0089] Brightness level determination module 210 is used to determine the current display brightness level of the display panel;

[0090] The pulse width determination module 220 is used to determine the pulse width of the first light emission control pulse and the pulse width of the second light emission control pulse in each driving cycle according to the current display brightness level; wherein, each light emission stage includes a first light emission control pulse and at least one second light emission control pulse; as the display brightness level increases, the pulse width of the first light emission control pulse gradually increases, the sum of the pulse widths of the first light emission control pulse and the second light emission control pulse gradually increases, and the minimum pulse width of the first light emission control pulse is greater than or equal to the first pulse width;

[0091] The driving module 230 is used to drive the display panel to display the image according to the pulse width of the first light emission control pulse and the pulse width of the second light emission control pulse.

[0092] Optionally, the first light emission control pulse is the first light emission control pulse in the light emission stage.

[0093] Optionally, when the display brightness level is less than or equal to the first preset brightness level, the pulse width of the first light emission control pulse for each display brightness level is equal to the first pulse width, and the pulse width of the second light emission control pulse gradually increases as the display brightness level increases.

[0094] When the display brightness level is greater than the first preset brightness level, as the display brightness level increases, the pulse width of the first light emission control pulse gradually increases, the pulse width of the second light emission control pulse gradually increases, and the pulse width of the first light emission control pulse is greater than or equal to the first pulse width.

[0095] When the display brightness level is less than or equal to the first preset brightness level, the minimum pulse width of the second light emission control pulse is less than the first pulse width;

[0096] Optionally, when the display brightness level is less than or equal to the second preset brightness level, the pulse width of the second light emission control pulse is equal to the second pulse width, the second pulse width is less than the first pulse width, and the second preset brightness level is less than the first preset brightness level;

[0097] When the display brightness level is greater than the second preset brightness level, the pulse width of the second light emission control pulse gradually increases as the display brightness level increases.

[0098] Optionally, when the display brightness level is greater than the first preset brightness level, the pulse width of the first light emission control pulse increases stepwise as the display brightness level increases;

[0099] Optionally, the emission stage includes a first emission control pulse and at least three second emission control pulses;

[0100] Optionally, when the display brightness level is greater than the second preset brightness level, the pulse width of each second light emission control pulse increases stepwise as the display brightness level increases.

[0101] Optionally, the maximum pulse width of the first light emission control pulse and the second light emission control pulse are the same;

[0102] The pulse width of the first light emission control pulse increases by the same amount each time, and / or the pulse width of the second light emission control pulse increases by the same amount each time;

[0103] Optionally, the pulse width of the first light emission control pulse increases by the same amount each time as the pulse width of the second light emission control pulse increases by the same amount each time.

[0104] The display panel driving device provided in the embodiments of the present invention and the display panel driving method described in any embodiment of the present invention belong to the same inventive concept and have the same beneficial effects.

[0105] Based on the above embodiments, this invention also provides a display device. Figure 9 This is a schematic diagram of a display device provided in an embodiment of the present invention, with reference to... Figure 9 The display device 100 includes a display panel 200 and a driving device 300 for the display panel as described in any embodiment of the present invention. The display device 100 can be an electronic device such as a mobile phone or tablet.

[0106] The display device provided in the embodiments of the present invention includes a display panel and a driving device for the display panel as described in any embodiment of the present invention, and has the same beneficial effects as the driving device and driving method for the display panel provided in any embodiment of the present invention.

[0107] 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.

[0108] 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 for a display panel, characterized in that, include: Determine the current display brightness level of the display panel; The pulse widths of the first and second light-emitting control pulses in each driving cycle are determined based on the current display brightness level. Each light-emitting stage includes one first light-emitting control pulse and at least one second light-emitting control pulse. As the display brightness level increases, the pulse width of the first light-emitting control pulse generally increases across all display brightness levels. The sum of the pulse widths of the first and second light-emitting control pulses gradually increases, and the minimum pulse width of the first light-emitting control pulse is greater than or equal to the first pulse width. The display panel is driven to display the image based on the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse; The first light emission control pulse is the light emission control pulse that has the greatest impact on the light emission brightness of the sub-pixel in the light emission stage, and the first light emission control pulse is the first light emission control pulse in the light emission stage; When the display brightness level is less than or equal to the first preset brightness level, the pulse width of the first light emission control pulse for each display brightness level is equal to the first pulse width. As the display brightness level increases, the pulse width of the second light emission control pulse gradually increases. When the display brightness level is greater than the first preset brightness level, as the display brightness level increases, the pulse width of the first light emission control pulse gradually increases, the pulse width of the second light emission control pulse gradually increases, and the pulse width of the first light emission control pulse is greater than the first pulse width.

2. The driving method for the display panel according to claim 1, characterized in that: When the display brightness level is less than or equal to the first preset brightness level, the minimum pulse width of the second light emission control pulse is less than the first pulse width.

3. The driving method for the display panel according to claim 2, characterized in that: When the display brightness level is less than or equal to the second preset brightness level, the pulse width of the second light emission control pulse is equal to the second pulse width, the second pulse width is less than the first pulse width, and the second preset brightness level is less than the first preset brightness level. When the display brightness level is greater than the second preset brightness level, the pulse width of the second light emission control pulse gradually increases as the display brightness level increases.

4. The driving method for the display panel according to claim 3, characterized in that: When the display brightness level is greater than the first preset brightness level, the pulse width of the first light emission control pulse increases stepwise as the display brightness level increases.

5. The driving method for the display panel according to claim 4, characterized in that: The light emission stage includes a first light emission control pulse and at least three second light emission control pulses.

6. The driving method for a display panel according to claim 5, characterized in that: When the display brightness level is greater than the second preset brightness level, the pulse width of each second light emission control pulse increases stepwise as the display brightness level increases.

7. The driving method for a display panel according to claim 1, characterized in that: The first light emission control pulse and the second light emission control pulse have the same maximum pulse width; The pulse width of the first light emission control pulse increases by the same amount each time, and / or the pulse width of the second light emission control pulse increases by the same amount each time.

8. The driving method for a display panel according to claim 7, characterized in that: The pulse width of the first light emission control pulse increases by the same amount each time as the pulse width of the second light emission control pulse increases by the same amount each time.

9. A driving device for a display panel, characterized in that, include: The brightness level determination module is used to determine the current display brightness level of the display panel; The pulse width determination module is used to determine the pulse width of the first light emission control pulse and the pulse width of the second light emission control pulse in each driving cycle according to the current display brightness level; wherein, each light emission stage includes a first light emission control pulse and at least one second light emission control pulse; as the display brightness level increases, the pulse width of the first light emission control pulse generally increases across all display brightness levels, the sum of the pulse widths of the first light emission control pulse and the second light emission control pulse gradually increases, and the minimum pulse width of the first light emission control pulse is greater than or equal to the first pulse width; The driving module is used to drive the display panel to display the image according to the pulse width of the first light-emitting control pulse and the pulse width of the second light-emitting control pulse; The first light emission control pulse is the light emission control pulse that has the greatest impact on the light emission brightness of the sub-pixel in the light emission stage, and the first light emission control pulse is the first light emission control pulse in the light emission stage; When the display brightness level is less than or equal to the first preset brightness level, the pulse width of the first light emission control pulse for each display brightness level is equal to the first pulse width. As the display brightness level increases, the pulse width of the second light emission control pulse gradually increases. When the display brightness level is greater than the first preset brightness level, as the display brightness level increases, the pulse width of the first light emission control pulse gradually increases, the pulse width of the second light emission control pulse gradually increases, and the pulse width of the first light emission control pulse is greater than the first pulse width.

10. A display device, characterized in that, It includes a display panel and a driving device for the display panel as described in claim 9.

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