Brightness control method, display driving chip and display device

Abstract

The invention provides a brightness control method, a display driving chip and a display device, and relates to the technical field of display. The method comprises the following steps: acquiring a to-be-displayed image frame and a current brightness factor; if it is judged that the to-be-displayed image frame is the non-scanning frame and is not the last non-scanning frame of the current period, the light-emitting signal pulse width of the to-be-displayed image frame is determined based on the current brightness factor; wherein the non-scanning frame is an image frame except the first frame in the current period; and controlling the brightness of the to-be-displayed image frame according to the light-emitting signal pulse width. The brightness of the non-scanning frame is compensated by setting the light emitting time of the non-scanning frame under different brightness factors, so that the brightness attenuation is inhibited, and the display quality is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a brightness control method, a display driver chip, and a display device. Background Technology

[0002] AMOLED displays are characterized by high contrast, wide color gamut, thinness, power efficiency, and narrow bezels, making them widely used in mainstream electronic products such as mobile phones and sports watches. The light-emitting principle of an AMOLED display can be divided into three stages: initialization, scanning and charging, and light emission. The display units on the panel contain storage capacitors. When displaying static images, it is not necessary to scan and charge for each frame; simply keeping the light-emitting circuit operational is sufficient for display. However, if the number of non-scanning frames is large, brightness will decrease, leading to screen flicker. Summary of the Invention

[0003] The purpose of this application is to provide a brightness control method, a display driver chip, and a display device, which can compensate for the brightness of non-scanning frames by setting the emission time of non-scanning frames under different brightness factors, thereby suppressing brightness decay and improving display quality.

[0004] In a first aspect, embodiments of this application provide a brightness control method, the method comprising: acquiring an image frame to be displayed and a current brightness factor; if it is determined that the image frame to be displayed is a non-scanning frame and is not the last non-scanning frame of the current cycle, then determining the pulse width of the light emission signal of the image frame to be displayed based on the current brightness factor; wherein, the non-scanning frame is an image frame other than the first frame of the current cycle; and controlling the brightness of the image frame to be displayed according to the pulse width of the light emission signal.

[0005] In this embodiment of the application, if it is determined that the image frame to be displayed is a non-scanned frame and is not the last non-scanned frame, the pulse width of the light emission signal of the image frame to be displayed is dynamically determined according to the current brightness factor, so as to use the pulse width of the light emission signal to compensate and control the brightness of the image frame to be displayed, thereby effectively suppressing the brightness decay of the image frame to be displayed and improving the display quality.

[0006] In some embodiments, determining the pulse width of the light emission signal of the image frame to be displayed based on the current brightness factor includes: if it is determined that the current brightness factor is not a critical brightness factor, then determining a first critical brightness factor and a second critical brightness factor adjacent to the current brightness factor; wherein the first critical brightness factor is less than the current brightness factor, and the current brightness factor is less than the second critical brightness factor; and determining the pulse width of the light emission signal of the image frame to be displayed based on the first critical brightness factor and the second critical brightness factor.

[0007] In this embodiment, considering storage resource issues and production calibration costs, a key brightness factor is typically defined first, and the pulse width of the emission signal under the key brightness factor is adjusted. Then, the pulse widths of the emission signal related to the key brightness factor are pre-stored. Therefore, if it is determined that the current brightness factor is not a key brightness factor, it is necessary to determine the first and second key brightness factors adjacent to the current brightness factor. Based on the first and second key brightness factors, the pulse width of the emission signal for the image frame to be displayed is determined, and this pulse width is used for brightness compensation control of the image frame to be displayed, thereby improving display quality.

[0008] In some embodiments, determining the emission signal pulse width of the image frame to be displayed based on a first key brightness factor and a second key brightness factor includes: acquiring the first emission signal pulse width of the scanned frame and the second emission signal pulse width of the last non-scanned frame under the first key brightness factor; acquiring the third emission signal pulse width of the scanned frame and the fourth emission signal pulse width of the last non-scanned frame under the second key brightness factor; calculating the emission signal pulse width of the scanned frame under the current brightness factor based on the first emission signal pulse width and the third emission signal pulse width; calculating the emission signal pulse width of the last non-scanned frame under the current brightness factor based on the second emission signal pulse width and the fourth emission signal pulse width; and determining the emission signal pulse width of the image frame to be displayed based on the emission signal pulse width of the scanned frame and the emission signal pulse width of the last non-scanned frame under the current brightness factor.

[0009] In this embodiment, since the pulse width of the emission signal under the key brightness factor is a known value, it can be directly obtained. Based on the obtained value, the pulse width of the emission signal of the scanned frame and the pulse width of the emission signal of the last non-scanned frame under the current brightness factor are calculated, thereby dynamically generating the pulse width of the emission signal of the image frame to be displayed under the current brightness factor, thus improving the display quality.

[0010] In some embodiments, the image frame to be displayed includes a display number; determining the light emission signal pulse width of the image frame to be displayed based on the light emission signal pulse width of the scanned frame under the current brightness factor and the light emission signal pulse width of the last non-scanned frame under the current brightness factor includes: determining the light emission signal pulse width of the image frame to be displayed based on the light emission signal pulse width of the scanned frame under the current brightness factor, the light emission signal pulse width of the last non-scanned frame under the current brightness factor, and the display number.

[0011] In this embodiment, considering that a cycle includes multiple sequentially displayed non-scanning frames, the brightness decay of later non-scanning frames within a cycle becomes more severe over time. Therefore, determining the pulse width of the light emission signal for the image frame to be displayed by combining the display number improves the accuracy of pulse width determination, thereby effectively suppressing the brightness decay of the image frame to be displayed and improving display quality.

[0012] In some embodiments, the pulse width of the light emission signal of the image frame to be displayed is determined based on the pulse width of the light emission signal of the scanned frame under the current brightness factor, the pulse width of the light emission signal of the last non-scanned frame under the current brightness factor, and the display number, including: using the formula Calculate the pulse width of the non-emitting signal in the image frame to be displayed; where, This indicates the pulse width of the non-light-emitting signal of the image frame to be displayed. This indicates the non-emitting signal pulse width of the scan frame under the current brightness factor. This indicates the pulse width of the non-emitting signal in the last non-scan frame under the current luminance factor. This represents the total number of frames in one cycle. This indicates the display number of the image frame to be displayed. Indicates the display number of the scan frame. For a pre-set fixed value, This indicates the rounding down sign; the pulse width of the emitted signal is determined based on the pulse width of the non-emitting signal.

[0013] In this embodiment, the pulse width of the light emission signal of the scanned frame under the current brightness factor, the pulse width of the light emission signal of the last non-scanned frame under the current brightness factor, and the display number are used to determine the pulse width of the light emission signal, which improves the accuracy of the pulse width determination and thus effectively suppresses the brightness decay of the image frame to be displayed and improves the display quality.

[0014] In some embodiments, determining the pulse width of the light emission signal of the image frame to be displayed based on the current brightness factor includes: if the current brightness factor is determined to be a critical brightness factor, then obtaining the pulse width of the light emission signal of the scan frame in the current period and the pulse width of the light emission signal of the last non-scan frame under the current brightness factor; and determining the pulse width of the light emission signal of the image frame to be displayed based on the pulse width of the light emission signal of the scan frame and the pulse width of the light emission signal of the last non-scan frame.

[0015] In this embodiment of the application, if the current brightness factor is determined to be a critical brightness factor, the known value is directly obtained to determine the pulse width of the light emission signal of the image frame to be displayed, so as to use the pulse width of the light emission signal to compensate and control the brightness of the image frame to be displayed, thereby effectively suppressing the brightness decay of the image frame to be displayed and improving the display quality.

[0016] In some embodiments, controlling the brightness of the image frame to be displayed based on the pulse width of the light emission signal includes: determining the light emission duration of the image frame to be displayed based on the pulse width of the light emission signal; and controlling the brightness of the image frame to be displayed based on the light emission duration.

[0017] In this embodiment, the emission duration is determined based on the pulse width of the emission signal, so as to control the brightness of the image frame to be displayed by means of the emission duration, thereby effectively suppressing the brightness decay of the image frame to be displayed and improving the display quality.

[0018] Secondly, embodiments of this application provide a display driver chip, which includes a memory and a processor; wherein the memory stores the pulse width of the light emission signal of the scan frame in each cycle and the pulse width of the light emission signal of the last non-scan frame under a key brightness factor; the processor is used to execute the method steps of any embodiment of the first aspect.

[0019] Thirdly, embodiments of this application provide a display device, which includes a display panel and a display driver chip; wherein the display panel and the display driver chip are connected; the display panel is used to display an image frame to be displayed, and the display driver chip is used to drive the image frame to be displayed to emit light.

[0020] Fourthly, embodiments of this application provide an electronic device, including: a processor and a memory, the memory storing machine-readable instructions executable by the processor, the machine-readable instructions being able to perform the method steps of any embodiment of the first aspect when executed by the processor.

[0021] Fifthly, embodiments of this application provide a computer-readable storage medium, including: computer program instructions stored on the computer-readable storage medium, wherein the computer program instructions are executed by a processor to perform the method steps of any embodiment of the first aspect.

[0022] In a sixth aspect, embodiments of this application provide a computer program product, including: computer program instructions, which are executed by a processor to perform the method steps of any embodiment of the first aspect.

[0023] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A working framework diagram of an AMOLED display provided in an embodiment of this application; Figure 2A schematic flowchart illustrating a brightness control method provided in an embodiment of this application; Figure 3 This application provides a schematic diagram illustrating the variation of the pulse width of the luminous signal corresponding to different image frames within the same period under different brightness factors. Figure 4 A brightness representation diagram provided in an embodiment of this application; Figure 5 This is a schematic diagram of the electronic device structure provided in an embodiment of this application. Detailed Implementation

[0026] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0027] It should be noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0029] In the description of the embodiments in this application, the term "and / or" 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. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0030] AMOLED displays are characterized by high contrast, wide color gamut, thinness, energy saving, and narrow bezels, and are widely used in mainstream electronic products such as mobile phones and sports watches.

[0031] The light-emitting principle of AMOLED displays can be divided into three stages: initialization, scanning and charging, and light emission. Figure 1 A working framework diagram of an AMOLED display provided in this application embodiment is shown below. Figure 1As shown, in an AMOLED display, the display driver chip is responsible for pushing the image onto the AMOLED display through the source pad pin when the host sends the display screen, and outputting control signals for the GEOA circuit to initialize, scan, and control the light emission of the display unit.

[0032] The dimming principle of the AMOLED screen's GEOA circuit is explained as follows: The GEOA circuit includes a scanning circuit and a light-emitting circuit. First, the scanning circuit sends the source voltage line by line into the storage circuit in the light-emitting unit of the display panel. Then, the light-emitting circuit controls the light emission line by line. When the light-emitting circuit controls the light emission line by line, the Emission signal is the key signal controlling the light emission.

[0033] The Emission signal (EM signal) is an electrical signal, a control voltage applied to the driving transistor inside the pixel. This signal directly controls the switching of the driving transistor, thus determining whether the OLED emitter is powered on and emits light.

[0034] Emission signal width refers to the length of time the EM signal remains at an "active" level. Essentially, it is the actual length of time a pixel is allowed to emit light within a single frame period.

[0035] The relationship between emission signal width and brightness: Under constant current, the longer the emission time, the more light output the pixel accumulates within the frame, and the higher the average brightness perceived by the human eye.

[0036] Based on the above, it can be seen that AMOLED displays have storage circuits in their display units. Although scanning and charging are required for each frame when the image is dynamically updated, this is unnecessary when displaying static images, as each frame displays the same image; simply keeping the light-emitting circuit operational is sufficient. This method saves power consumption generated during the scanning phase.

[0037] For example, if a static image has 6 frames, during display, the first frame undergoes initialization, scanning, and charging, storing the source voltage in the cell capacitor. This process is not repeated for the subsequent 5 frames. When displaying the last 5 frames, the corresponding display driver chip can shut down its internal source and scan circuits, thus saving power. That is, if N frames constitute a static image display cycle, after scanning and charging the first frame, scanning and charging stop for the next N-1 frames. Here, the first frame undergoing scanning and charging is considered a scanned frame, and frames not undergoing scanning and charging are considered non-scanned frames.

[0038] While this method can save power consumption, it relies solely on the voltage stored in the capacitor of each light-emitting unit to emit light in conjunction with the light-emitting circuit. As the capacitor discharges, the brightness of each frame in the uncharged frame will gradually decrease. If there are many uncharged frames, the brightness decrease will be more severe, resulting in screen flickering.

[0039] To address the aforementioned issues, this application provides a brightness control method, a display driver chip, and a display device, which compensate for the brightness of non-scanning frames by setting the emission time of non-scanning frames under different brightness factors, thereby suppressing brightness decay and improving display quality.

[0040] Figure 2 This is a flowchart illustrating a brightness control method provided in an embodiment of this application, which is applied to a display driver chip. Figure 2 As shown, the method includes: Step S201: Obtain the image frame to be displayed and the current brightness factor.

[0041] Step S202: If it is determined that the image frame to be displayed is a non-scanning frame and is not the last non-scanning frame of the current cycle, then the pulse width of the light emission signal of the image frame to be displayed is determined based on the current brightness factor; wherein, the non-scanning frame is the image frame other than the first frame in the current cycle.

[0042] Step S203: Control the brightness of the image frame to be displayed according to the pulse width of the light emission signal.

[0043] The image frame to be displayed refers to the image that will be displayed by the display device. The current brightness factor refers to the scaling factor or adjustment parameter applied by the display device to the image frame to be displayed, which is used to dynamically adjust the brightness level of the image frame to be displayed.

[0044] The cycle refers to the number of frames between two consecutive scan charging operations. In other words, one cycle is the total number of scanned and non-scanned frames after one scan charging operation. The cycle is pre-set adaptively based on the refresh rate supported by the display device.

[0045] For example, if the display device supports a refresh rate of 15Hz, one cycle consists of 4 frames (60 / 15=4), meaning one cycle includes 4 image frames, of which 1 scan frame (the first frame) and 3 non-scan frames are included. If the display device supports a refresh rate of 5Hz, then one cycle consists of 12 frames (60 / 5=12), meaning one cycle includes 12 image frames, of which 1 scan frame (the first frame) and 11 non-scan frames are included.

[0046] Based on the above, a scanned frame refers to the first image frame of the current cycle, which needs to be scanned and charged. A non-scanned frame refers to any image frame in the current cycle other than the first frame.

[0047] Since the cycle is preset, it is possible to determine which frames are scan frames and which are the last non-scan frames. To make efficient use of the display driver chip's storage and computing resources, the pulse widths of the emission signals for the scan frames under different brightness factors and the pulse widths of the emission signals for the last non-scan frames are pre-tuned. The results of this tuning are then pre-installed into the display driver chip for storage.

[0048] The pulse width of the luminous signal for other non-scanning frames within a period is determined by acquiring the pulse width of the luminous signal for the scanning frame and the last non-scanning frame under the corresponding period and the corresponding brightness factor.

[0049] It should be noted that, in order to further improve the storage resource utilization of the display driver chip and reduce production calibration costs, several key brightness factors are pre-determined. Then, the pulse width of the light emission signal of the scan frame and the pulse width of the light emission signal of the last non-scan frame under each key brightness factor are adjusted. This ensures that the display driver chip only stores the pulse width of the light emission signal of the scan frame and the pulse width of the light emission signal of the last non-scan frame for each cycle under the key brightness factors.

[0050] It should be noted that the pulse width of the emission signal of the scan frame under each key brightness factor is known information, and the pulse width of the emission signal of the last non-scan frame is obtained by adjusting the pulse width of the emission signal of the scan frame.

[0051] Therefore, in the above implementation process, the display driver chip obtains the image frame to be displayed sent by the host, and obtains the current brightness factor of the display device. If it is determined that the image frame to be displayed is a non-scanning frame, and is not the last non-scanning frame of the current cycle, then the pulse width of the light emission signal of the image frame to be displayed is determined based on the current brightness factor.

[0052] Here, the emission signal refers to the emission signal, and the emission signal pulse width refers to the emission signal width, that is, the actual length of time during which emission is allowed.

[0053] Finally, the brightness of the image frame to be displayed is controlled based on the pulse width of the light emission signal.

[0054] In this embodiment of the application, if it is determined that the image frame to be displayed is a non-scanned frame and is not the last non-scanned frame, the pulse width of the light emission signal of the image frame to be displayed is dynamically determined according to the current brightness factor, so as to use the pulse width of the light emission signal to compensate and control the brightness of the image frame to be displayed, thereby effectively suppressing the brightness decay of the image frame to be displayed and improving the display quality.

[0055] In some embodiments, determining the pulse width of the light emission signal of the image frame to be displayed based on the current brightness factor includes: if it is determined that the current brightness factor is not a critical brightness factor, then determining a first critical brightness factor and a second critical brightness factor adjacent to the current brightness factor; wherein the first critical brightness factor is less than the current brightness factor, and the current brightness factor is less than the second critical brightness factor; and determining the pulse width of the light emission signal of the image frame to be displayed based on the first critical brightness factor and the second critical brightness factor.

[0056] As can be seen from the above embodiments, considering storage resource issues and production calibration costs, a key brightness factor is usually defined first, and the pulse width of the light emission signal under the key brightness factor is adjusted. Then, the pulse width of the light emission signal related to the key brightness factor is pre-stored in the display driver chip.

[0057] Therefore, in the specific implementation process, after obtaining the current luminance factor, it is necessary to first determine whether the current luminance factor is a predefined key luminance factor.

[0058] If the current brightness factor is determined not to be a critical brightness factor, then the first and second critical brightness factors adjacent to it on the left and right are determined based on the current brightness factor; wherein the first critical brightness factor is smaller than the current brightness factor, and the current brightness factor is smaller than the second critical brightness factor. Then, the pulse width of the emission signal of the image frame to be displayed is determined based on the first and second critical brightness factors.

[0059] Specifically, the process involves obtaining the first emission signal pulse width of the scan frame and the second emission signal pulse width of the last non-scan frame under the first key brightness factor; obtaining the third emission signal pulse width of the scan frame and the fourth emission signal pulse width of the last non-scan frame under the second key brightness factor; calculating the emission signal pulse width of the scan frame under the current brightness factor based on the first and third emission signal pulse widths; calculating the emission signal pulse width of the last non-scan frame under the current brightness factor based on the second and fourth emission signal pulse widths; and determining the emission signal pulse width of the image frame to be displayed based on the emission signal pulse widths of the scan frame and the last non-scan frame under the current brightness factor.

[0060] If the current brightness factor is determined to be a critical brightness factor, then the pulse width of the light emission signal of the scan frame in the current cycle and the pulse width of the light emission signal of the last non-scan frame are obtained under the current brightness factor; based on the pulse width of the light emission signal of the scan frame and the pulse width of the light emission signal of the last non-scan frame, the pulse width of the light emission signal of the image frame to be displayed is determined.

[0061] In this embodiment, if the current brightness factor is determined not to be a critical brightness factor, the pulse width of the emission signal of the image frame to be displayed is determined based on the first and second critical brightness factors. This pulse width is then used for brightness compensation control of the image frame to be displayed, thereby improving display quality. If the current brightness factor is determined to be a critical brightness factor, a known value is directly obtained to determine the pulse width of the emission signal of the image frame to be displayed. This pulse width is then used for brightness compensation control of the image frame to be displayed, effectively suppressing brightness attenuation and improving display quality.

[0062] In some embodiments, the image frame to be displayed includes a display number; determining the light emission signal pulse width of the image frame to be displayed based on the light emission signal pulse width of the scanned frame under the current brightness factor and the light emission signal pulse width of the last non-scanned frame under the current brightness factor includes: determining the light emission signal pulse width of the image frame to be displayed based on the light emission signal pulse width of the scanned frame under the current brightness factor, the light emission signal pulse width of the last non-scanned frame under the current brightness factor, and the display number.

[0063] As can be seen from the above embodiments, the period is fixed, and the image frames within the period are displayed sequentially in chronological order. Therefore, the scanned frames and non-scanned frames within the period have corresponding display numbers.

[0064] For example, one cycle includes 4 image frames, where the first frame is a scan frame with display number 1, and the following three frames are non-scan frames with display numbers 2, 3 and 4 respectively.

[0065] Considering that the brightness decays more severely in later non-scanning frames within a cycle over time, the pulse width of the emission signal should differ for different non-scanning frames. Furthermore, the pulse width of the emission signal should be wider in later non-scanning frames.

[0066] Based on this, the embodiments of this application determine the pulse width of the light emission signal of the image frame to be displayed according to the pulse width of the light emission signal of the scanned frame under the current brightness factor, the pulse width of the light emission signal of the last non-scanned frame under the current brightness factor, and the display number.

[0067] Specifically, through the formula Calculate the pulse width of the non-emitting signal in the image frame to be displayed; where, This indicates the pulse width of the non-light-emitting signal of the image frame to be displayed. This indicates the non-emitting signal pulse width of the scan frame under the current brightness factor. This indicates the pulse width of the non-emitting signal in the last non-scan frame under the current luminance factor. This represents the total number of frames in one cycle. This indicates the display number of the image frame to be displayed. This indicates the display number of the scan frame. Since the scan frame is always the first frame of a cycle, therefore... ; For a pre-set fixed value, This indicates the rounding down sign; the pulse width of the emitted signal is determined based on the pulse width of the non-emitting signal.

[0068] It should be noted that, Adaptive settings are made based on the characteristics of the display device. For example, if the display device is a mobile phone, then... If the display device is a smartwatch, then .

[0069] When EM is high, the PMOS transistor is off and the screen does not emit light; when EM is low, the PMOS transistor is on and the screen emits light. Therefore, the pulse width of the non-emitting signal refers to the width of the high-level EM signal (EMH width), and the pulse width of the emitting signal refers to the width of the low-level EM signal (EML width).

[0070] The pulse width of the luminous signal is equal to the display time of one frame of the image to be displayed minus the pulse width of the non-luminous signal calculated above. If necessary, the necessary blanking / refresh time should also be subtracted.

[0071] Figure 3 This is a schematic diagram illustrating the variation of the pulse width of the emission signal corresponding to different image frames within the same period under different brightness factors, as provided in an embodiment of this application. Figure 3 As shown, the period includes 6 image frames, where Ak and A1 represent the non-emitting signal pulse widths of the scanned frames under luminance factor k and luminance factor 1, respectively, within the current period; and Bk and B1 represent the non-emitting signal pulse widths of the last non-scanned frame under luminance factor k and luminance factor 1, respectively, within the current period. The luminance factor gradually increases from luminance factor k to luminance factor 1.

[0072] Under a luminance factor k, the pulse width of the non-emitting signal in the non-scanning frames between the scanned frame and the last non-scanning frame gradually decreases, while the pulse width of the emitting signal gradually increases. Under a luminance factor of 1, the pulse width of the non-emitting signal in the non-scanning frames between the scanned frame and the last non-scanning frame also gradually decreases, while the pulse width of the emitting signal also gradually increases. However, the magnitude of the change in the pulse width of the non-emitting signal differs under luminance factors k and luminance factor 1.

[0073] This demonstrates that, under the same brightness factor, the pulse width of the emission signal differs between different frames, and under different brightness factors, the pulse width of the emission signal within the same frame also differs. The method of this application allows for dynamic control of the brightness of the image to be displayed under different brightness factors and on different display devices.

[0074] In this embodiment, the pulse width of the light emission signal of the scanned frame under the current brightness factor, the pulse width of the light emission signal of the last non-scanned frame under the current brightness factor, and the display number are used to determine the pulse width of the light emission signal, which improves the accuracy of the pulse width determination and thus effectively suppresses the brightness decay of the image frame to be displayed and improves the display quality.

[0075] In some embodiments, controlling the brightness of the image frame to be displayed based on the pulse width of the light emission signal includes: determining the light emission duration of the image frame to be displayed based on the pulse width of the light emission signal; and controlling the brightness of the image frame to be displayed based on the light emission duration.

[0076] Figure 4 A brightness representation diagram provided for an embodiment of this application, such as Figure 4 As shown, by applying the brightness control method provided in this application, the goal of maximizing power saving is achieved over time, while also ensuring the brightness performance of the display device under different brightness factors.

[0077] In this embodiment, the emission duration is determined based on the pulse width of the emission signal, so as to control the brightness of the image frame to be displayed by means of the emission duration, thereby effectively suppressing the brightness decay of the image frame to be displayed and improving the display quality.

[0078] This application provides a display driver chip, which includes a memory and a processor; wherein the memory stores the pulse width of the light emission signal of the scan frame in each cycle and the pulse width of the light emission signal of the last non-scan frame under a key brightness factor; the processor is used to execute the method steps of any of the above embodiments.

[0079] This application provides a display device, which includes a display panel and a display driver chip; wherein the display panel and the display driver chip are connected; the display panel is used to display an image frame to be displayed, and the display driver chip is used to drive the image frame to be displayed to emit light.

[0080] Figure 5 This is a schematic diagram of the electronic device structure provided in the embodiments of this application, such as... Figure 5 As shown, the electronic device includes a processor 501, a memory 502, and a bus 503; wherein the processor 501 and the memory 502 communicate with each other via the bus 503. The processor 501 is used to call program instructions in the memory 502 to execute the methods provided in the above-described method embodiments.

[0081] Processor 501 can be an integrated circuit chip with signal processing capabilities. The processor 501 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor.

[0082] The memory 502 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0083] This application provides a computer program product, including: computer program instructions, which are executed by a processor to perform the methods provided in the above-described method embodiments.

[0084] This application provides a computer-readable storage medium, including: computer program instructions stored on the computer-readable storage medium, which, when executed by a processor, perform the methods provided in the above-described method embodiments.

[0085] Computer-readable storage media can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0086] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0087] Furthermore, 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.

[0088] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0089] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A brightness control method, characterized in that, The method includes: Get the image frame to be displayed and the current brightness factor; If it is determined that the image frame to be displayed is a non-scanning frame and is not the last non-scanning frame of the current cycle, then the pulse width of the light emission signal of the image frame to be displayed is determined based on the current brightness factor; wherein, the non-scanning frame is the image frame of the current cycle excluding the first frame. The brightness of the image frame to be displayed is controlled according to the pulse width of the light emission signal.

2. The method according to claim 1, characterized in that, Determining the pulse width of the luminous signal of the image frame to be displayed based on the current brightness factor includes: If it is determined that the current brightness factor is not a critical brightness factor, then a first critical brightness factor and a second critical brightness factor adjacent to the current brightness factor are determined; wherein, the first critical brightness factor is smaller than the current brightness factor, and the current brightness factor is smaller than the second critical brightness factor. The pulse width of the light emission signal of the image frame to be displayed is determined based on the first key brightness factor and the second key brightness factor.

3. The method according to claim 2, characterized in that, Determining the pulse width of the luminous signal of the image frame to be displayed based on the first key brightness factor and the second key brightness factor includes: Under the first key brightness factor, obtain the first emission signal pulse width of the scan frame in the current period and the second emission signal pulse width of the last non-scan frame; and obtain the third emission signal pulse width of the scan frame and the fourth emission signal pulse width of the last non-scan frame under the second key brightness factor. Based on the first and third emission signal pulse widths, the emission signal pulse width of the scan frame under the current brightness factor is calculated; and based on the second and fourth emission signal pulse widths, the emission signal pulse width of the last non-scan frame under the current brightness factor is calculated. The pulse width of the light emission signal of the image frame to be displayed is determined based on the pulse width of the light emission signal of the scanned frame under the current brightness factor and the pulse width of the light emission signal of the last non-scanned frame under the current brightness factor.

4. The method according to claim 3, characterized in that, in, The image frame to be displayed includes a display number; determining the pulse width of the light emission signal of the image frame to be displayed based on the pulse width of the light emission signal of the scanned frame under the current brightness factor and the pulse width of the light emission signal of the last non-scanned frame under the current brightness factor includes: The pulse width of the light emission signal of the image frame to be displayed is determined based on the pulse width of the light emission signal of the scanned frame under the current brightness factor, the pulse width of the light emission signal of the last non-scanned frame under the current brightness factor, and the display number.

5. The method according to claim 4, characterized in that, The step of determining the pulse width of the light emission signal of the image frame to be displayed based on the pulse width of the light emission signal of the scanned frame under the current brightness factor, the pulse width of the light emission signal of the last non-scanned frame under the current brightness factor, and the display number includes: Through formula Calculate the pulse width of the non-emitting signal of the image frame to be displayed; wherein, This indicates the pulse width of the non-emitting signal of the image frame to be displayed. This indicates the non-emitting signal pulse width of the scan frame under the current brightness factor. This indicates the non-emitting signal pulse width of the last non-scan frame under the current luminance factor. This represents the total number of frames in one cycle. This indicates the display number of the image frame to be displayed. This indicates the display number of the scan frame. For a pre-set fixed value, Indicates the floor function; The pulse width of the emitted signal of the image frame to be displayed is determined based on the pulse width of the non-emitting signal.

6. The method according to claim 1, characterized in that, Determining the pulse width of the luminous signal of the image frame to be displayed based on the current brightness factor includes: If the current brightness factor is determined to be the key brightness factor, then the pulse width of the light emission signal of the scan frame in the current period and the pulse width of the light emission signal of the last non-scan frame are obtained under the current brightness factor. The pulse width of the light emission signal of the image frame to be displayed is determined based on the pulse width of the light emission signal of the scanned frame and the pulse width of the light emission signal of the last non-scanned frame.

7. The method according to any one of claims 1-6, characterized in that, The step of controlling the brightness of the image frame to be displayed based on the pulse width of the light emission signal includes: Based on the pulse width of the light emission signal, the light emission duration of the image frame to be displayed is determined; The brightness of the image frame to be displayed is controlled by the duration of light emission.

8. A display driver chip, characterized in that, The display driver chip includes a memory and a processor; The memory stores the pulse width of the light emission signal for each scan frame in each cycle and the pulse width of the light emission signal for the last non-scan frame under the key brightness factor. The processor is used to execute the brightness control method according to any one of claims 1-7.

9. A display device, characterized in that, The display device includes a display panel and a display driver chip as described in claim 8; wherein the display panel and the display driver chip are connected; the display panel is used to display an image frame to be displayed, and the display driver chip is used to drive the image frame to be displayed to emit light.

10. A computer program product, characterized in that, include: Computer program instructions, which are executed by a processor to perform the method as described in any one of claims 1-7.

Images