Brightness adjustment method, device and display panel

Abstract

The application provides a brightness adjustment method and device and a display panel. The method comprises: receiving a first dimming control signal; generating a light emitting pulse signal according to the first dimming control signal, the light emitting pulse signal being used for brightness adjustment of the display panel, the light emitting pulse signal comprising M pulses, M being a positive integer greater than or equal to 2; wherein the M pulses comprise X first pulses and Y second pulses, the pulse width of the low level of the X first pulses being greater than the pulse width of the low level of the Y second pulses, X and Y being positive integers less than M. Through the above method, the probability of brightness drop and flicker of the display panel during low brightness display can be reduced, thereby helping to improve the SVM index of the display panel during low brightness display.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a method, apparatus, and display panel for adjusting brightness. Background Technology

[0002] As AMOLED display technology continues to develop, users' demands for AMOLED products are also constantly increasing. Users' expectations for AMOLED products go beyond just improved image quality; they also include more refined brightness adjustment functions. Against this backdrop, brightness adjustment has become one of the important indicators for evaluating the quality of AMOLED products. AMOLED screens with excellent brightness adjustment functions can provide a more comfortable visual experience based on different ambient lighting conditions and user needs.

[0003] However, when an AMOLED module uses PWM dimming to display a low-brightness image, the low duty cycle of the emission pulse may result in insufficient charging time for the light-emitting device, especially the first emission pulse, which may not be able to accumulate enough charge in a short time, thus causing the driving current to be unstable. This instability of the current will directly affect the brightness output of the pixels, causing the display to show a decrease in brightness and flickering, and causing the SVM measurement index to deteriorate. Summary of the Invention

[0004] This application provides a method, apparatus, and display panel for adjusting brightness, which can reduce the probability of brightness drop and flickering when the display panel is displayed at low brightness, thereby helping to improve the SVM index of the display panel when displayed at low brightness.

[0005] In a first aspect, a method for adjusting brightness is provided, the method comprising: receiving a first dimming control signal; generating a light-emitting pulse signal according to the first dimming control signal, the light-emitting pulse signal being used for adjusting the brightness of a display panel, the light-emitting pulse signal comprising M pulses, M being a positive integer greater than or equal to 2; wherein the M pulses comprise: X first pulses and Y second pulses, the pulse width of the low level of the X first pulses being greater than the pulse width of the low level of the Y second pulses, and X and Y being positive integers less than M.

[0006] In this embodiment of the application, by increasing the pulse width of some pulses (corresponding to the first pulse) in the light emission pulse signal, the probability of brightness decrease and flickering of the display panel when displaying at low brightness can be reduced. This helps to improve the SVM index of the display panel when displaying at low brightness, thereby reducing eye fatigue in nighttime environments or low-light usage scenarios, reducing the discomfort caused by flickering to the eyes, and optimizing the user experience of the display panel.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, the X first pulses are the first X pulses among the M pulses.

[0008] Since the brightness of AMOLED display panels decreases easily and flickering occurs when the brightness drops in the first few pulses during low-brightness display using PWM dimming control, this embodiment of the application increases the pulse width of the first X pulses in the light emission pulse signal, which can more effectively reduce the probability of brightness drop and flickering when the display panel is in low-brightness display, thereby significantly improving the visual comfort of users in dark environments.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the M pulses include N groups of pulses, each of the N groups of pulses including: a first pulse and two second pulses, where N is a positive integer less than M.

[0010] In one possible implementation, the first pulse in the N groups of pulses is the first pulse, and the second and third pulses are the second pulses.

[0011] In this embodiment, M pulses are divided into N groups of pulses, and each group of pulses includes a first pulse. In this way, the probability of brightness decrease and flickering of the display panel when displaying at low brightness can be reduced more effectively, thereby significantly improving the visual comfort of users in dark environments.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the difference between the pulse widths of the X first pulses and the Y second pulses is a first preset value.

[0013] In this embodiment of the application, by setting the pulse width difference between the first pulse and the second pulse, the probability of brightness reduction and flickering of the display panel when displaying at low brightness can be reduced more effectively, thereby providing users with a softer and more comfortable visual experience.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the first preset value is 40 times the time it takes for the display panel to display one line of pixels.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the M pulses are located within the same frame rate period, and the duty cycle of the low level of the light-emitting pulse signal is greater than or equal to 12% and less than or equal to 15%.

[0016] In this embodiment of the application, by setting the range of the low-level duty cycle of the light-emitting pulse signal, the probability of brightness decrease and flickering of the display panel when displaying at low brightness can be reduced, while ensuring the accuracy of the colors displayed by the display panel, so as to achieve a balance between flickering and display quality.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, before receiving the first dimming control signal, the method further includes: receiving a second dimming control signal; and controlling the difference between the initialization voltage and the cathode voltage of the OLED device in the display panel to be a second preset value according to the second dimming control signal, wherein the second preset value is greater than or equal to 0.

[0018] In this embodiment, by setting the difference between the OLED device initialization voltage and the cathode voltage, it is possible to ensure that a higher current is provided when the pixel is started, thereby improving the brightness of the first few pulses of the display panel when displaying at low brightness, and thus more effectively improving the flicker phenomenon of the display panel.

[0019] Secondly, a brightness adjustment device is provided, the device comprising: a transceiver unit and a processing unit; the transceiver unit is configured to receive a first dimming control signal; the processing unit is configured to generate a light-emitting pulse signal according to the first dimming control signal, the light-emitting pulse signal being used for brightness adjustment of a display panel, the light-emitting pulse signal comprising M pulses, where M is a positive integer greater than or equal to 2; wherein the M pulses comprise: X first pulses and Y second pulses, the pulse width of the low level of the X first pulses being greater than the pulse width of the low level of the Y second pulses, and X and Y being positive integers less than M.

[0020] In conjunction with the second aspect, in some implementations of the second aspect, the X first pulses are the first X pulses among the M pulses.

[0021] In conjunction with the second aspect, in some implementations of the second aspect, the M pulses include N groups of pulses, each of the N groups of pulses including: a first pulse and two second pulses, where N is a positive integer less than M.

[0022] In conjunction with the second aspect, in some implementations of the second aspect, the difference between the pulse widths of the X first pulses and the Y second pulses is a first preset value.

[0023] In conjunction with the second aspect, in some implementations of the second aspect, the first preset value is 40 times the time it takes for the display panel to display one line of pixels.

[0024] In conjunction with the second aspect, in some implementations of the second aspect, the M pulses are located within the same frame rate period, and the duty cycle of the low level of the light-emitting pulse signal is greater than or equal to 12% and less than or equal to 15%.

[0025] In conjunction with the second aspect, in some implementations of the second aspect, the transceiver unit is further configured to receive a second dimming control signal; the processing unit is further configured to control the difference between the initialization voltage and the cathode voltage of the OLED device in the display panel to a second preset value according to the second dimming control signal, wherein the second preset value is greater than or equal to 0.

[0026] Thirdly, a brightness adjustment device is provided, comprising: at least one processor and a memory, wherein the at least one processor is coupled to the memory for reading and executing instructions in the memory, such that the device implements the method in any of the implementations of the first aspect described above.

[0027] Fourthly, a computer-readable storage medium is provided, the computer-readable storage medium storing program code, which, when run on a computer, causes the computer to perform the method in any of the implementations of the first aspect described above.

[0028] Fifthly, a chip is provided, the chip including circuitry for performing the method in any of the implementations of the first aspect described above.

[0029] Sixthly, a computer program product is provided, the computer product including a computer program that, when the computer program is run by a processor, causes the method in any of the implementations of the first aspect to be executed.

[0030] In a seventh aspect, a display panel is provided, including the brightness adjustment device in any of the implementations of the second or third aspect described above. Attached Figure Description

[0031] Figure 1 This is a schematic diagram showing the change of the emission pulse over time in an AMOLED module during PWM dimming, according to an embodiment of this application.

[0032] Figure 2 This is a schematic diagram illustrating the change in brightness over time of an AMOLED module provided in an embodiment of this application;

[0033] Figure 3 This is a schematic flowchart illustrating a brightness adjustment method provided in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of an AMOLED module EM pulse optimization waveform provided in an embodiment of this application;

[0035] Figure 5 This is a waveform diagram showing the change of brightness over time in another AMOLED module after optimization, provided in an embodiment of this application.

[0036] Figure 6 This is a schematic diagram of another AMOLED module EM pulse optimization waveform provided in an embodiment of this application;

[0037] Figure 7 This is a waveform diagram showing the change of brightness over time in another AMOLED module after optimization, provided in an embodiment of this application.

[0038] Figure 8 This is a schematic diagram of another AMOLED module EM pulse optimization waveform provided in an embodiment of this application;

[0039] Figure 9 This is a waveform diagram showing the change of brightness over time in another AMOLED module after optimization, provided in an embodiment of this application.

[0040] Figure 10 This is a schematic diagram of the pixel circuit of an AMOLED module light-emitting device provided in an embodiment of this application;

[0041] Figure 11 This is a schematic diagram of a brightness adjustment device provided in an embodiment of this application;

[0042] Figure 12 This is a schematic diagram of another brightness adjustment device provided in an embodiment of this application. Detailed Implementation

[0043] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. In this application, "at least one" means one or more, and "more" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0044] The use of prefixes such as "first" and "second" in this application embodiment is solely for distinguishing different descriptive objects and does not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes to distinguish descriptive objects in this application embodiment does not constitute a limitation on the described objects. The description of the described objects is found in the claims or the context of the embodiments, and the use of such prefixes should not constitute unnecessary restrictions.

[0045] To better understand this application, the terms used in this application will first be explained and clarified.

[0046] (1) Pulse Width Modulation (PWM) dimming technology: This technology adjusts brightness by rapidly switching the display panel on and off. In PWM dimming, changing the duty cycle (the ratio of on to off time) of the switch controls the time the current flows through the emissive layer, thereby adjusting the brightness. For AMOLED display modules, the duty cycle typically refers to the proportion of low-level emission pulses (EM Pulse) within one cycle. The lower the duty cycle, the lower the screen brightness.

[0047] (2) Stroboscopic effect visibility measure (SVM): This is an indicator used to quantify the visibility of a light source's flicker effect. The flicker effect refers to the phenomenon where, under certain specific conditions, the human eye perceives moving objects intermittently, vaguely, or distortedly due to the periodic fluctuations in the brightness of a light source. A higher SVM value indicates a higher flicker intensity and a more severe flicker phenomenon; conversely, a lower SVM value indicates a lower flicker intensity and a more stable flicker. For example, the SVM value can be calculated using the following formula:

[0048]

[0049] Where Tm is the relative amplitude of the m-th Fourier component of the relative illuminance waveform; Cm is the contrast threshold function value of the stroboscopic effect corresponding to the frequency fm.

[0050] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0051] As AMOLED display technology continues to develop, users' demands for AMOLED products are also constantly increasing. Users' expectations for AMOLED products go beyond just improved image quality; they also include more refined brightness adjustment functions. Against this backdrop, brightness adjustment has become one of the important indicators for evaluating the quality of AMOLED products. AMOLED screens with excellent brightness adjustment functions can provide a more comfortable visual experience based on different ambient lighting conditions and user needs.

[0052] In practical applications, display panels equipped with AMOLED display modules can adjust the brightness of the display screen using either low-frequency PWM dimming technology or high-frequency PWM dimming technology. When the AMOLED display module uses low-frequency PWM dimming technology to adjust the screen brightness, selectable PWM dimming frequencies include 120Hz, 240Hz, and 480Hz. When the AMOLED display module uses high-frequency PWM dimming technology to adjust the screen brightness, selectable PWM dimming frequencies include 1440Hz, 1920Hz, 2160Hz, 3840Hz, and 4320Hz.

[0053] Taking a base refresh rate of 120Hz, a high-frequency PWM dimming frequency of 2160Hz, a frame cycle time of 8.34ms, and 18 EM pulses and PWM pulses per frame cycle, with each pulse lasting 0.46ms, as an example... Figure 1 As shown, when an AMOLED display module displays a low-brightness image (e.g., 2 nits), the duty cycle of the low-level pulse signal is low, typically only about 10%. Assuming the pulses are set to equal width, and the low-level percentage in the pulse signal is 10%, the low-level time of each EM pulse or PWM pulse is only 0.046ms. Due to the low duty cycle of the pulse signal, the charging time of the light-emitting device may be insufficient, especially the first pulse, which cannot accumulate enough charge in a short time, resulting in unstable driving current. This current instability directly affects the brightness output of the pixels, causing a decrease in brightness and flickering in the display image, leading to a deterioration in SVM measurement indicators. Specifically, as... Figure 2 As shown, within each frame display cycle, the first pulse has a low brightness, exhibiting a decrease in brightness and failing to effectively achieve the target display brightness in a short time. Furthermore, the fluctuations between the first pulse and other pulses in the same cycle are significant, leading to a deterioration in the SVM index.

[0054] This application provides a method, apparatus, and display panel for adjusting brightness, which can reduce the probability of brightness decrease and flickering when the display panel is displayed at low brightness, thereby helping to improve the SVM index of the display panel when displayed at low brightness.

[0055] Figure 3 This is a schematic flowchart of a brightness adjustment method provided in an embodiment of this application. The execution subject of method 300 can be a driver chip or controller in the display panel. Method 300 can include steps S301 and S302.

[0056] S301 receives the first dimming control signal.

[0057] Optionally, the first dimming control signal can be generated by the main control chip in the display panel and sent to the driver chip.

[0058] Optionally, the first dimming control signal may be a dimming control signal generated based on user input (e.g., slider or button input).

[0059] Optionally, the first dimming control signal may be derived from an intelligent dimming algorithm, which generates the first dimming control signal by comprehensively analyzing the ambient light of the display panel, user habits, or power consumption requirements.

[0060] S302 generates a light-emitting pulse signal based on the first dimming control signal.

[0061] The light-emitting pulse signal is used to adjust the brightness of the display panel. The light-emitting pulse signal includes M pulses, where M is a positive integer greater than or equal to 2. The M pulses include X first pulses and Y second pulses. The pulse width of the low level of the X first pulses is greater than the pulse width of the low level of the Y second pulses. X and Y are positive integers less than M.

[0062] In one possible implementation, the X first pulses are the first X pulses out of the M pulses.

[0063] For example, such as Figure 4 As shown, one frame rate period includes 18 pulses. When X=1, the pulse width of the first pulse is increased, which can achieve brightness compensation for the first pulse. The compensated brightness waveform can be shown as follows. Figure 5 As shown, from Figure 5 and Figure 2 The comparison shows that the decrease in brightness of the first pulse has been alleviated.

[0064] In one possible implementation, the M pulses comprise N groups of pulses, each of which includes a first pulse and two second pulses, where N is a positive integer less than M, i.e., N = X, Y = 2X, and M = 3N.

[0065] Optionally, the first pulse in the N groups of pulses is the first pulse, and the second and third pulses are the second pulses.

[0066] Optionally, the difference between the pulse widths of the X first pulses and the Y second pulses is a first preset value, which can be understood as: the difference between the pulse width of any one of the X first pulses and any one of the Y second pulses is the first preset value. Further optionally, the first preset value is 40 times the time it takes for the display panel to display one line of pixels.

[0067] For example, such as Figure 6As shown, one frame rate cycle includes 18 pulses, which can correspond to 6 groups of pulses. The pulse width of the first pulse in each group is 'a', and the pulse widths of the second and third pulses are 'b', where ab = 40H. When the display panel includes an AMOLED module, H represents the time it takes for the AMOLED to display one row of pixels. Therefore, brightness compensation can be achieved for the first pulse of each group, and the compensated brightness waveform can be as follows... Figure 7 As shown, from Figure 7 and Figure 2 The comparison shows that the decrease in brightness of the first pulse in each group of pulses has been alleviated.

[0068] It should be noted that, Figure 6 and Figure 7 This explanation is based on the example of each pulse group consisting of 3 pulses, and does not constitute a limitation on this application. The number of pulses in each pulse group can be related to the number of pulses in each frame period and the support of DDIC.

[0069] In one possible implementation, M pulses are located within the same frame rate period, and the duty cycle of the low level of the luminous pulse signal is greater than or equal to 12% and less than or equal to 15%.

[0070] Alternatively, this implementation can also be independent of method 300, where the M pulses have the same pulse width, and the duty cycle of the low level of the luminous pulse signal is greater than or equal to 12% and less than or equal to 15%. For example, as... Figure 8 As shown, one frame rate cycle includes 18 pulses, all with equal pulse widths, and the low-level portion of the entire emission pulse signal accounts for 12%. Therefore, brightness compensation can be achieved for each pulse, and the compensated brightness waveform can be as follows: Figure 9 As shown, from Figure 9 and Figure 2 The comparison shows that the brightness decrease of the first pulse is alleviated. The rationale behind this setting is as follows: when the low-level duty cycle of the light-emitting pulse signal increases, the OLED light-emitting current of each pulse decreases, which in turn affects the driving current of the RGB sub-pixels. This is because different RGB sub-pixels have different response times; at a lower current density, the influence of the RGB sub-pixels will be amplified, thus changing the color ratio of the RGB sub-pixels and affecting the accuracy of the displayed colors. Therefore, simply increasing the low-level duty cycle of the light-emitting pulse signal will degrade the display quality of the display panel. By setting the low-level duty cycle of the light-emitting pulse signal to a range of 12% to 15%, the probability of brightness decrease and flickering in low-brightness display can be reduced, while ensuring the accuracy of the displayed colors, achieving a balance between flicker and display quality.

[0071] In one possible implementation, before step S301, method 300 further includes: receiving a second dimming control signal; and controlling the difference between the initialization voltage and the cathode voltage of the OLED device in the display panel to be a second preset value according to the second dimming control signal, wherein the second preset value is greater than or equal to 0.

[0072] For example, such as Figure 10 As shown, the initial voltage of the OLED device is V. INIT The cathode voltage is ELVSS, which is achieved by setting V. INIT -ELVSS = 0.5V can more effectively improve the flicker phenomenon of the display panel. This is because a higher initial voltage difference can provide a higher current when the pixel starts up, thereby increasing the brightness of the first pulse when the display is in low brightness, and thus improving the brightness drop. In addition, a higher initial voltage also helps to eliminate the charge trap effect and the effect of parasitic capacitance, thereby ensuring that the startup time of each pixel is as similar as possible, so that the brightness of the display panel is more uniform, and thus more effectively improves the flicker phenomenon.

[0073] It should be noted that this implementation method can also be applied independently of method 300, and can also improve the flickering phenomenon of the display panel.

[0074] In this embodiment of the application, by increasing the pulse width of some pulses (corresponding to the first pulse) in the light emission pulse signal, the probability of brightness decrease and flickering of the display panel when displaying at low brightness can be reduced. This helps to improve the SVM index of the display panel when displaying at low brightness, thereby reducing eye fatigue in nighttime environments or low-light usage scenarios, reducing the discomfort caused by flickering to the eyes, and optimizing the user experience.

[0075] It should be understood that, unless otherwise specified or logically conflicting, the terms and / or descriptions of the various implementations are consistent and can be referenced by each other. The technical features of different implementations can be combined to form new implementations or embodiments based on their inherent logical relationships.

[0076] This application also provides an apparatus for implementing any of the above methods, the apparatus including units for implementing each step performed in any of the above methods.

[0077] Figure 11This is a schematic diagram of a brightness adjustment device provided in an embodiment of this application. The device 1100 may include a transceiver unit 1110, a storage unit 1120, and a processing unit 1130. The transceiver unit 1110 is used to acquire instructions and / or data, and may also be referred to as a communication interface or communication unit. The storage unit 1120 is used to implement corresponding storage functions and store corresponding instructions and / or data. The processing unit 1130 is used to perform data processing so that the device 1100 can implement the above-described brightness adjustment method.

[0078] The device 1100 includes a transceiver unit 1110 and a processing unit 1130. The transceiver unit 1110 is used to receive a first dimming control signal. The processing unit 1130 is used to generate a light-emitting pulse signal according to the first dimming control signal. The light-emitting pulse signal is used to adjust the brightness of the display panel. The light-emitting pulse signal includes M pulses, where M is a positive integer greater than or equal to 2. The M pulses include X first pulses and Y second pulses. The pulse width of the low level of the X first pulses is greater than the pulse width of the low level of the Y second pulses. X and Y are positive integers less than M.

[0079] In one possible implementation, the X first pulses are the first X pulses out of the M pulses.

[0080] In one possible implementation, the M pulses comprise N groups of pulses, each of the N groups comprising: a first pulse and two second pulses, where N is a positive integer less than M.

[0081] In one possible implementation, the difference between the pulse widths of the X first pulses and the Y second pulses is a first preset value.

[0082] In one possible implementation, the first preset value is 40 times the time it takes for the display panel to display one line of pixels.

[0083] In one possible implementation, M pulses are located within the same frame rate period, and the duty cycle of the low level of the luminous pulse signal is greater than or equal to 12% and less than or equal to 15%.

[0084] In one possible implementation, the transceiver unit 1110 is further configured to receive a second dimming control signal; the processing unit 1130 is further configured to control the difference between the initial voltage and the cathode voltage of the OLED device in the display panel to a second preset value according to the second dimming control signal, wherein the second preset value is greater than or equal to 0.

[0085] Figure 12This is a schematic diagram of another brightness adjustment device provided in an embodiment of this application. The device 1200 includes a memory 1210, a processor 1220, and a communication interface 1230. The memory 1210, processor 1220, and communication interface 1230 are connected via an internal connection path. The memory 1210 stores instructions, and the processor 1220 executes the instructions stored in the memory 1210 to control the communication interface 1230 to acquire information, or to enable the device 1200 to implement the aforementioned brightness adjustment method for the display panel. Optionally, the memory 1210 can be coupled to the processor 1220 via an interface, or it can be integrated with the processor 1220.

[0086] It should be noted that the communication interface 1230 described above uses a transceiver device, such as, but not limited to, a transceiver. The communication interface 1230 may also include an input / output interface.

[0087] The processor 1220 stores one or more computer programs, which include instructions. When the instructions are executed by the processor 1220, the device 1200 performs the brightness adjustment methods described in the above embodiments.

[0088] In implementation, each step of the above method can be completed by the integrated logic circuitry of the hardware in the processor 1220 or by instructions in software form. The method disclosed in the embodiments of this application can be directly implemented by a hardware processor, or by a combination of hardware and software modules in the processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 1210, and the processor 1220 reads the information in memory 1210 and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, detailed descriptions are not provided here.

[0089] Optionally, Figure 12 The communication interface 1230 in the middle can achieve Figure 11 The transceiver unit 1110 in the middle, Figure 12 The memory 1210 in the middle can achieve Figure 11 Storage unit 1120 in the middle, Figure 12 The processor 1220 in the middle can achieve Figure 11 The processing unit 1130 in the middle.

[0090] This application also provides a computer-readable storage medium storing program code that, when executed on a computer, causes the computer to perform the above-described... Figure 3 The method shown.

[0091] This application also provides a computer program product, which includes a computer program that, when run, causes the computer to perform the above-described actions. Figure 3 The method shown.

[0092] This application also provides a computer-readable storage medium storing program code, which, when executed on a computer, causes the computer to perform the above-described... Figure 3 The method shown.

[0093] This application embodiment also provides a chip, which includes a circuit for performing the above-described... Figure 3 The method shown.

[0094] This application also provides a computer program product, which includes a computer program that, when executed by a processor, causes the above-mentioned... Figure 3 The method shown.

[0095] This application embodiment also provides a display panel, including the above-described... Figure 11 or Figure 12 The brightness adjustment device shown.

[0096] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0097] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0098] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0099] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0100] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0101] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0102] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method of adjusting luminance, characterized by, The method comprises: receiving a second dimming control signal; controlling, according to the second dimming control signal, a difference between an initialization voltage and a cathode voltage of an OLED device in the display panel to be a second preset value, the second preset value being greater than or equal to 0; receiving a first dimming control signal; generating, according to the first dimming control signal, a light-emitting pulse signal, the light-emitting pulse signal being used for brightness adjustment of the display panel, the light-emitting pulse signal comprising M pulses, M being a positive integer greater than or equal to 2; wherein the M pulses comprise X first pulses and Y second pulses, a pulse width of a low level of the X first pulses being greater than a pulse width of a low level of the Y second pulses, X and Y being positive integers less than M.

2. The method of claim 1, wherein, The X first pulses are the first X pulses in the M pulses.

3. The method of claim 1, wherein, The M pulses comprise N groups of pulses, each group of pulses in the N groups of pulses comprising one first pulse and two second pulses, N being a positive integer less than M.

4. The method of any one of claims 1 to 3, wherein, A difference between the pulse widths of the X first pulses and the Y second pulses is a first preset value.

5. The method of claim 4, wherein, The first preset value is 40 times a time for the display panel to display one row of pixels.

6. The method of any one of claims 1 to 3, wherein, The M pulses are located within a same frame rate period, and a duty cycle of a low level of the light-emitting pulse signal is greater than or equal to 12% and less than or equal to 15%.

7. A device for adjusting luminance, characterized in that The apparatus comprises a transceiving unit and a processing unit. The transceiving unit is configured to receive a second dimming control signal. The processing unit is configured to control, according to the second dimming control signal, a difference between an initialization voltage and a cathode voltage of an OLED device in the display panel to be a second preset value, the second preset value being greater than or equal to 0. The transceiving unit is further configured to receive a first dimming control signal. The processing unit is further configured to generate, according to the first dimming control signal, a light-emitting pulse signal, the light-emitting pulse signal being used for brightness adjustment of the display panel, the light-emitting pulse signal comprising M pulses, M being a positive integer greater than or equal to 2. wherein the M pulses comprise X first pulses and Y second pulses, a pulse width of a low level of the X first pulses being greater than a pulse width of a low level of the Y second pulses, X and Y being positive integers less than M.

8. The apparatus of claim 7, wherein, The X first pulses are the first X pulses in the M pulses.

9. The apparatus of claim 7, wherein, The M pulses comprise N groups of pulses, each group of pulses in the N groups of pulses comprising one first pulse and two second pulses, N being a positive integer less than M.

10. The apparatus of any one of claims 7 to 9, wherein, A difference between the pulse widths of the X first pulses and the Y second pulses is a first preset value.

11. The apparatus of claim 10, wherein, The first preset value is 40 times a time for the display panel to display one row of pixels.

12. The apparatus of any one of claims 7 to 9, wherein, The M pulses are located within a same frame rate period, and a duty cycle of a low level of the light-emitting pulse signal is greater than or equal to 12% and less than or equal to 15%.

13. A display panel, characterized by The display panel comprises the brightness adjustment apparatus according to any one of claims 7 to 12.

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