Display control method, display driver integrated circuit, display screen, and electronic device

Abstract

The present application relates to the technical field of display, and discloses a display control method, a display driver integrated circuit (DDIC), a display screen, and an electronic device. In the method, the DDIC does not rely on a curve gain value in a brightness adjustment instruction issued by an AP to perform current limiting processing, that is, there is no need to downscale a gamma curve. Instead, the brightness of a current image frame is compared with preset total brightness, such as high-brightness mode (HBM) brightness, so as to determine whether current limiting processing needs to be performed on the current image frame. When it is determined that current limiting processing needs to be performed on the current image frame, source voltage differences for display are regulated by adjusting the source voltages of pixels, thereby limiting the EL current of the pixels.

Description

Display control method, display driving integrated circuit, display screen and electronic device

[0001] The present application claims priority from the Chinese patent application No. 202411368756.1 filed on September 27, 2024, and entitled "Display control method, display driving integrated circuit, display screen and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of display, and in particular, to a display control method, a display driving integrated circuit, a display screen and an electronic device. BACKGROUND

[0003] With the development of electronic devices, people have higher and higher requirements for the picture display quality of the display screen of the electronic device. For example, in order to improve the picture display quality, the electronic device can use average picture level (APL) technology to locally dim the display picture, such as highlighting (e.g., adjusting the brightness to the maximum brightness) the area with higher brightness in the display picture, so that the visibility and color performance of the display picture in a bright environment are significantly improved. In some display technologies, the brightness of a pixel in the display screen depends on the size of the driving current of the pixel, and the larger the driving current, the larger the brightness of the pixel. For example, the power supply circuit in the electronic device can apply an electro-luminescent voltage for the drain (ELVDD) voltage and an electro-luminescent voltage for the source (ELVSS) to the pixel, and the driving current of the pixel is the current (i.e., EL current) on the loop between ELVDD and ELVSS.

[0004] When the display screen displays a picture, in order to improve the quality of the display picture, the APL technology may require highlighting of many or even all pixels in the display screen, which may require increasing the EL current of these pixels. For example, when the display screen enters a 20% APL scene, the brightness requirement can be 2500 nits, 3000 nits or even higher, resulting in a high EL current of the highlighted pixels. Among them, 20% APL refers to the average brightness of 20% bright area in the display picture of the display screen. In addition, when the display screen enters an APL 100% scene, the entire picture of the display screen is required to reach a highlighted state, resulting in an excessively high EL current of the display screen as a whole. However, if the EL current of the display screen is large or even exceeds the design rule of the supply current, it may cause risks such as overheating, overcurrent black screen of the display screen, which affects the stability and service life of the device. SUMMARY

[0005] Embodiments of the present application provide a display control method, a display driving integrated circuit, a display screen and an electronic device, which can adjust the source voltage of the pixel by the DDIC to limit the EL current of the pixel, so as to perform current limiting processing on each frame image of the display in real time.

[0006] In a first aspect, embodiments of the present application provide a display control method applied to a display screen, the display screen comprising a display driving chip DDIC and a display panel, the display panel comprising a plurality of pixel units, each pixel unit comprising a first common electrode and a source level, and the method comprising: obtaining a first image to be displayed, and determining that the total brightness of the first image is a first total brightness, wherein the source voltage of the pixel unit corresponding to the first total brightness of the first image is a first source voltage; in response to the first total brightness being greater than a preset total brightness, performing inverse compensation on the first source voltage of the pixel unit to obtain a second source voltage, wherein under the second source voltage, the total brightness of the first image displayed by the plurality of pixel units is a second total brightness, and the second total brightness is less than or equal to the preset total brightness; and controlling the display panel to display the first image based on the second source voltage of the pixel unit.

[0007] It can be understood that the pixel unit can also be referred to as a pixel, and the source voltage of the pixel unit can be a source voltage. For example, the first common voltage can be an ELVDD voltage of the pixel unit. In this way, the present application inversely compensates the brightness of each pixel by inversely compensating the source voltage of each pixel, so that the total brightness of the first image of the current frame after inverse compensation does not exceed the preset total brightness. Thus, current limiting processing is performed on the first image of the current frame, so that the display panel does not occur overcurrent phenomenon when displaying the first image.

[0008] In a possible implementation of the first aspect, the inverse compensation of the first source voltage of the pixel unit to obtain the second source voltage comprises: determining that the voltage difference of the pixel unit under the first total brightness is a first voltage difference, and the voltage difference of the pixel unit under the preset total brightness is a second voltage difference, and determining an inverse compensation value of the pixel unit according to the first voltage difference and the second voltage difference of the pixel unit, wherein the voltage difference is the voltage difference between the voltage of the source level of the pixel unit and the voltage of the first common electrode; and adjusting the source voltage of the pixel unit from the first source voltage to the second source voltage according to the inverse compensation value of the pixel unit, so that the total brightness of the first image is adjusted from the first total brightness to the second total brightness.

[0009] It can be understood that the pressure difference of the pixel can be a source pressure difference. Further, the source voltage of each pixel is inversely compensated using the inverse compensation value of each pixel to reduce the source voltage of each pixel to reduce the EL current in each pixel. Finally, the display panel displays the first image of the current frame based on the source voltage of each pixel after the inverse compensation processing.

[0010] In a possible implementation of the first aspect, the inverse compensation value of the pixel unit is determined according to the first pressure difference and the second pressure difference of the pixel unit, including: taking the absolute value of the difference between the first pressure difference and the second pressure difference of the pixel unit as the inverse compensation value of the pixel unit; and the source voltage of the pixel unit is adjusted from the first source voltage to the second source voltage according to the inverse compensation value of the pixel unit, including: subtracting the corresponding inverse compensation value from the first source voltage of the source voltage of the pixel unit to obtain the second source voltage of the pixel unit. In this way, the second total brightness of the first image is less than or equal to the preset total brightness, ensuring that the display screen will not have an overcurrent phenomenon when displaying the first image.

[0011] In a possible implementation of the first aspect, the method further includes: performing first processing on the first image to obtain the first source voltage of the pixel unit, wherein the first processing includes at least one of the following: decompression processing, sub-pixel unit rearrangement (SPR) processing, gamma curve acquisition, brightness unevenness compensation processing such as demura processing, and voltage drop (IR-Drop) processing. For example, the decompression processing can be decompression processing using display stream compression (DSC).

[0012] In a possible implementation of the first aspect, the first source voltage of the pixel unit is the source voltage obtained after voltage drop processing on the first image. In this way, the DDIC in the present application can reduce the source voltage of each pixel after optimizing the first image through various processing such as SPR processing and demura processing, to reduce the source pressure difference of each pixel to limit the current of the pixel. Thus, the first image has a good display effect while the display screen does not have an overcurrent phenomenon.

[0013] In a possible implementation manner of the first aspect, the first processing on the first image to obtain the first source voltage of the pixel unit comprises: decompressing the first image to obtain decompressed data; performing sub-pixel rearrangement processing on the decompressed data to obtain rearranged data; obtaining a gamma curve corresponding to the first display brightness value, wherein the first display brightness is a display brightness value corresponding to a previous frame of the first image, and the first display brightness value is greater than a preset brightness value; performing brightness non-uniformity compensation processing on the rearranged data based on the gamma curve to obtain uniform data; and performing voltage drop processing on the uniform data to obtain the first driving signal, wherein the first driving signal comprises the first source voltage of the pixel unit. For example, the first display brightness value is 4095.

[0014] In a possible implementation manner of the first aspect, the method further comprises: updating the first source voltage of the pixel unit in the first driving signal to a second source voltage to obtain a second driving signal; performing conversion processing on the second driving signal to obtain a third driving signal, wherein the second source voltage in the pixel unit in the third driving signal is an analog signal; and controlling the display panel to display the first image based on the second source voltage of the pixel unit, comprising: controlling the display panel to display the first image based on the third driving signal.

[0015] In a possible implementation manner of the first aspect, the method further comprises: receiving a second display brightness value corresponding to the first image from an application processor (AP), wherein the second display brightness value is less than or equal to a preset display brightness value, the second display brightness value is received from the AP after the display panel displays the first image, the first image does not satisfy a first dimming condition, and the first dimming condition comprises: a proportion of an area of a first region in the first image to an area of the display panel is less than or equal to a preset proportion, and a brightness of pixels in the first region is greater than a brightness threshold. For example, the first dimming condition can be an APL mode triggering condition, the first region can be a region requiring high brightness in the first image, and the brightness threshold can be an APL brightness. At this time, the first region can be an APL region, and the DDIC can adopt an APL technology to locally dim the first image, such as highlighting the first region in the first image.

[0016] In a possible implementation manner of the first aspect, a total brightness corresponding to the first image is a second total brightness, a brightness of the pixel unit in the first region in the first image is a first brightness, and a brightness of the pixel unit in a second region other than the first region in the first image is a second brightness, the first brightness is greater than the second brightness, and the first brightness corresponds to the first display brightness value.

[0017] In a possible implementation manner of the first aspect, the preset total brightness is a total brightness (i.e., HBM brightness) of a plurality of pixel units in a high brightness mode (HBM).

[0018] In a second aspect, an electronic device is provided. The electronic device includes an application processor (AP) and a display screen. The display screen includes a display driving chip (DDIC) and a display panel. The display panel includes a plurality of pixel units. Each pixel unit includes a first common electrode and a source electrode. The AP is configured to send a first image to be displayed to the DDIC. The DDIC is configured to receive the first image from the AP and determine a total brightness of the first image as a first total brightness. A source voltage of the pixel unit corresponding to the first total brightness of the first image is a first source voltage. The DDIC is configured to perform inverse compensation on the first source voltage of the pixel unit to obtain a second source voltage, in response to the first total brightness being greater than a preset total brightness. A total brightness of the first image displayed by the plurality of pixel units at the second source voltage is a second total brightness, and the second total brightness is less than or equal to the preset total brightness. The DDIC is configured to control the display panel to display the first image based on the second source voltage of the pixel unit.

[0019] It can be understood that the DDIC in the second aspect can also perform the display control method in the first aspect and any possible implementation manner thereof.

[0020] In a third aspect, a display driving chip (DDIC) is provided. The DDIC is configured to perform the display control method in the first aspect and any possible implementation manner thereof.

[0021] In a fourth aspect, a display screen is provided. The display screen includes a display panel and a display driving chip (DDIC) as in the third aspect. The display panel is configured to display an image sent by the DDIC.

[0022] The beneficial effects of the second aspect, the third aspect and the fourth aspect can be referred to the related description in the first aspect, and will not be described here again. BRIEF DESCRIPTION OF DRAWINGS

[0023] FIG. 1A is a schematic diagram of an APL value of a display screen according to an embodiment of the present application;

[0024] FIG. 1B is a schematic diagram of a structure of a pixel and related voltages according to an embodiment of the present application;

[0025] FIG. 1C is a schematic diagram of a brightness adjustment scenario according to an embodiment of the present application;

[0026] FIG. 2 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application;

[0027] FIG. 3 is a schematic diagram of a related process of brightness adjustment of image data by an electronic device using APL technology according to an embodiment of the present application;

[0028] FIG. 4 is a schematic diagram of a response of a luminance adjustment instruction in a luminance adjustment process according to an embodiment of the present application;

[0029] FIG. 5 is a schematic diagram of a process of current limiting processing of a DDIC according to an embodiment of the present application;

[0030] FIG. 6 is a schematic diagram of a process of current limiting processing of a DDIC according to another embodiment of the present application;

[0031] FIG. 7 is a schematic diagram of a process of a display control method according to an embodiment of the present application;

[0032] FIG. 8 is a schematic diagram of a process of a display control method according to another embodiment of the present application;

[0033] FIG. 9 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] The illustrative embodiments of the present application include, but are not limited to, a display control method and an electronic device.

[0035] First, some terms in the embodiments of the present application are described.

[0036] 1. High dynamic range (HDR)

[0037] HDR is a set of techniques used in computer graphics and cinematography to achieve a greater dynamic range of exposure (i.e., a greater contrast ratio) than ordinary digital imaging techniques. For example, HDR techniques can include artificial intelligence (AI) HDR techniques and HDR Vivid techniques.

[0038] 2. APL

[0039] APL can be used in display technology to measure the proportion of bright areas on the display screen and the brightness distribution, where the APL value can be described in the form of similar screen ratio. For example, 20% APL refers to the average brightness of 20% bright area in the display picture of the display screen. At this time, the APL area is the proportion of the panel pixel area of the bright area in the display picture in the total panel pixel area, such as 20%; the APL brightness is the average brightness of the pixels in the bright area. For the convenience of understanding, referring to FIG. 1A, the calculation of APL is explained by taking the picture displayed by the display screen including a black background and a pure white rectangular area as an example. 20% APL refers to the average brightness of the pure white rectangular area when the size of the pure white rectangular area accounts for 1 / 5 of the size of the entire picture. Moreover, APL brightness is a kind of local excitation brightness, which plays an important role in AI HDR and HDR Vivid and other HDR technologies. For example, when the display screen displays an HDR image, APL technology can highlight the bright area on the display screen, such as adjusting to the maximum brightness.

[0040] 3. APL mode

[0041] APL mode refers to a mode in which the electronic device uses APL technology to locally dim the display picture, such as highlighting the bright area in the display picture to the maximum brightness. Correspondingly, non-APL mode, also known as standard brightness mode, refers to a mode in which the electronic device does not locally dim the display picture.

[0042] 4. ELVDD and ELVSS

[0043] ELVDD and ELVSS are two voltages used to control the light emission of the pixels of the display screen, ELVDD is similar to positive electrode, and ELVSS is similar to negative electrode. As shown in FIG. 1B, each pixel in the display screen is usually composed of an anode and a cathode, ELVDD is usually provided to the anode of the pixel, and ELVSS is provided to the cathode of the pixel.

[0044] 5. EL current

[0045] EL current refers to the current flowing through the loop formed by ELVDD and ELVSS in the pixel of the display screen. For example, the brightness of the pixel can be realized by controlling the EL current flowing through the pixel.

[0046] 6. Source voltage

[0047] A display panel of a display screen includes a plurality of pixel units (hereinafter referred to as pixels). Each pixel in the display screen is usually composed of three sub-pixels of red, green and blue (RGB), which jointly determine the color of the pixel. Each sub-pixel is usually controlled by a switch tube such as a thin-film transistor (TFT) to achieve accurate adjustment of the voltage of the pixel. The source voltage refers to the voltage of the source electrode (i.e., Source electrode) of the switch tube in the pixel, and the source voltage of the pixel specifically includes the source voltage of each sub-pixel in the pixel. It can be understood that the source voltage of the pixel is used to control the display state of the pixel, specifically to control whether each sub-pixel in the pixel displays. In addition, the source voltage of the pixel can also be referred to as the source voltage of the pixel.

[0048] 7. source voltage difference

[0049] The source voltage difference of the pixel refers to the voltage difference between the source voltage of the pixel and the voltage of the common electrode (such as common ground or common anode). In some embodiments, the source voltage difference is the voltage difference between the source voltage and ELVDD, such as source voltage difference = source voltage - ELVDD. In other embodiments, the source voltage difference is the voltage difference between the source voltage and ELVSS, such as source voltage difference = source voltage - ELVSS. It can be understood that the source voltage difference of the pixel is used to control the display characteristics such as brightness and color of the pixel. As the source voltage difference increases, the channel of the switch tube becomes larger and the impedance becomes smaller, so that the EL current of the pixel increases and the brightness of the pixel becomes higher. In some embodiments, the source voltage difference can be dynamically adjusted according to the requirements of the display picture. For example, when displaying a pure white picture, in order to obtain higher brightness, the source voltage difference will be increased accordingly; and when displaying a pure black picture, in order to reduce the brightness, the source voltage difference will be reduced or even close to zero.

[0050] The brightness adjustment scenario provided by the embodiments of the present application can be a scenario in which the display picture of the display screen needs to be locally dimmed, specifically a scenario in which the APL technology is used to highlight the local area of the display picture.

[0051] Referring to FIG. 1C, it is a brightness adjustment scenario provided by an embodiment of the present application.

[0052] As shown in FIG. 1C, when playing an HDR video, the mobile phone 100 can use the APL technology to highlight the bright area in the image A1 of the current frame, so as to improve the dynamic range of the image A1, and significantly improve the visibility and color performance of the image A1 in a bright environment. Taking the image A1 containing a landscape image as an example, the bright area in the image A1 can be the area where the objects such as clouds, fog, snow, etc. are located, such as the bright areas A11 and A12. At this time, the brightness of the bright area in the image A1 is too high, which will increase the use risk of the display screen. Therefore, in order to improve the display quality of the picture while reducing the use risk of the display screen, it is required to control the EL current in the display screen, such as current limiting processing of the EL current, to avoid the EL current being too large.

[0053] It can be understood that the content, number and shape of the bright area in the display picture of the display screen in the present application are not limited to the examples shown in FIG. 1C, and can be changed according to the actual display requirements. Among them, the display picture of the electronic device refers to the image in the displayed user interface, for example, the image corresponding to the video playing interface. In addition, in some embodiments, the brightness adjustment scene of the present application includes but is not limited to the above-mentioned video playing scene, and can also be other scenes that need to highlight the display picture locally, which is not limited in the present application.

[0054] The electronic device involved in the embodiments of the present application includes but is not limited to mobile terminals such as mobile phones, tablet computers, handheld computers, personal digital assistants (personal digital assistant, PDA), smart home devices such as smart televisions and smart cameras, wearable devices such as smart bracelets, smart watches and smart glasses, or other desktop, laptop, notebook computers, ultra-mobile personal computers (Ultra-mobile Personal Computer, UMPC), netbooks, smart screens and the like.

[0055] Referring to FIG. 2, an exemplary hardware structure schematic diagram of an electronic device 100 is shown.

[0056] As shown in FIG. 2, the electronic device 100 can include an application processor (application processor, AP) 210 and a display screen 220, wherein the display screen 220 includes a display driver integrated circuit (display driver integrated circuit, DDIC) 221 and a display panel 222. The image drawn by the AP 210 can be sent to the DDIC 221, and the DDIC 221 controls the display panel 222 to display.

[0057] The AP 210 can perform drawing and rendering calculation on the image data, overlay of layers / windows, and the like, and can also perform image compression, APL calculation, and the like on the image data. In some embodiments, the AP 210 is a system on chip (SoC), and the AP 210 can include a graphics processing unit (GPU) for drawing and rendering calculation on the image, and a data processing unit (DPU) for overlay of multiple layers / windows.

[0058] The DDIC 221 can convert the image data into signals recognizable by the pixel circuit, and also integrates various processing functions, such as optical optimization algorithms, to improve the display quality. For example, the DDIC can perform demura processing, IR-drop processing, and the like, to optimize the display effect of the display panel 222. As an example, the DDIC 221 can adjust the brightness of each pixel in the display panel 222 by adjusting the source voltage of each pixel. In some embodiments, the DDIC 221 includes a microcontroller unit (MCU) or an automatic current limitation (ACL) unit, which can be an intellectual property core (IP) for example. The MUC and the ACL are used to detect the brightness of the image data.

[0059] Referring to FIG. 3, a flowchart of adjusting the brightness of image data by using the APL technology by the electronic device is shown. Specifically, the AP 210 uses the GPU and the DPU to perform drawing, rendering, layer superimposition, and the like on the current frame image (S31: GPU-DPU synthesis); the AP 210 sends the current frame image to the DDIC 221 after compression (S32: compressed image sending); the AP 210 calculates the APL value of the current frame image by using the Hiace algorithm (S33: Hiace algorithm calculating APL area); and the AP 210 determines whether the APL area of the current frame image satisfies the APL mode triggering condition (e.g., whether ≦20% of the panel pixel area, i.e., S34: ≦20%) or not. If the APL area is ≦20% of the panel pixel area, the AP 210 sends the brightness adjustment instruction in the APL mode to the DDIC 221 (S35: issuing 4095 (APL DBV instruction) to enter the APL mode); if the APL area is >20% of the panel pixel area, the AP 210 does not perform processing or sends the brightness adjustment instruction in the non-APL mode to the DDIC 221 (S36: no processing or issuing other DBV (non-APL DBV instruction) to exit the APL mode); and the DDIC 221 receives the current frame image and outputs the image to the display panel 222 (S37: DDIC receiving and outputting the image).

[0060] In some embodiments, the AP 210 can determine the brightness adjustment instruction according to the APL value of the current frame image, and the brightness adjustment instruction can include a display brightness value (DBV). For example, the value of the DBV ranges from 0 to 4095. Specifically, when the APL area of the current frame image is ≦20% of the panel pixel area, the APL mode is entered, and the brightness adjustment instruction issued by the AP 210 can be referred to as an APL DBV instruction, and the DBV value in the instruction can be 4095, i.e., the brightness indicated by the DBV value is the maximum brightness. When the APL area of the current frame image is >20% of the panel pixel area, the APL mode is exited, and the brightness adjustment instruction issued by the AP 210 can be referred to as a non-APL DBV instruction, and the DBV value in the instruction is less than or equal to 3052, e.g., the brightness indicated by the DBV value of 3052 is relatively small compared to the maximum brightness.

[0061] In some embodiments, the brightness adjustment instruction described above includes not only the DBV value, but also a curve gain value (gain) corresponding to the DBV value. Different DBV values correspond to different gamma curves, also known as gray scale brightness curves, which can describe a non-linear curve between the gray level of a pixel on the display screen and the actual output brightness. In display technology, the gamma curve can be used to compensate for the non-linear brightness response of the display screen itself. The curve gain value corresponding to the DBV value is used to adjust the gamma curve, for example, to compress the curve. Specifically, in the APL mode, the display screen can perform brightness adjustment on the current frame image according to the gamma curve corresponding to the DBV value. In the non-APL mode, the display screen can first perform curve adjustment such as curve compression on the gamma curve according to the brightness gain value corresponding to the DBV value, and then perform brightness adjustment on the current frame image using the adjusted gamma curve.

[0062] Specifically, referring to FIG. 4, the response of the brightness adjustment instruction in the brightness adjustment process in FIG. 3 is described. It can be understood that “S32: compress and send image” and “S33: calculate APL area by Hiace algorithm” in FIG. 3 can be executed in parallel. However, the Hiace algorithm has a delay, so as shown in FIG. 4, after the DDIC 221 displays the current frame image, the AP 210 completes the calculation of the APL area by the Hiace algorithm and does not meet the APL mode trigger condition, such as APL area > 20% panel pixel area (Hiace algorithm calculation of APL area does not meet), and then sends the brightness adjustment instruction in the non-APL mode to the DDIC 221 (issue other DBV to exit APL mode). As an example, the process of calculating the APL value by the Hiace algorithm can require a display time of 1 to 3 frame images, so the brightness adjustment instruction issued by the AP 210 will also be delayed for 1 to 3 frame images to take effect. That is, the brightness adjustment instruction does not respond during the display process of the current frame image, but responds after the display of the subsequent 1 to 3 frame images is completed (the instruction does not respond in the current frame, and is delayed to respond in the subsequent frame). The number of delay frames is determined according to the calculation time of the Hiace algorithm, and is not limited to the above example of 1 to 3 frame images.

[0063] Therefore, when the DDIC 221 receives the current frame image, the DDIC 221 cannot receive the brightness adjustment instruction corresponding to the current frame image in time, and will perform brightness adjustment according to the DBV value and the gamma curve stored in the DDIC. As shown in FIG. 4, it is assumed that the current frame image is an Nth frame image, and the Nth frame image needs to be switched from the APL mode to the non-APL mode. At this time, the DDIC 221 has stored a DBV value corresponding to the APL mode of the (N-1)th frame image, such as 4095. Then, the DDIC 221 will use the gamma curve corresponding to the APL mode of the (N-1)th frame image to perform brightness adjustment on the Nth frame image (the last frame is the gamma curve corresponding to the APL DBV instruction). Thus, when the Nth frame image exits the APL mode, the gamma curve of the APL mode does not exit synchronously, which will cause the Nth frame image and subsequent frame images to be incorrectly subjected to local high brightness using the APL technology, and thus cause the picture brightness of the display screen to exceed the carrying capacity, resulting in a risk of overcurrent of the power supply circuit. In addition, the response delay of the brightness adjustment instruction of the device of the high-load system will be higher when the device is stuck, resulting in a longer overcurrent duration of the high-brightness area of the picture, further increasing the use risk of the display screen.

[0064] In some embodiments, in order to reduce the EL current of the display screen, the electronic device can perform current limiting processing on the EL current of the display screen through a power management integrated circuit (PMIC). The PMIC is used to supply power to the display screen, such as generating ELVDD and ELVSS voltages of each pixel in the display panel, thereby providing EL current to each pixel. However, if the EL current required by the display screen exceeds the current supply capacity of the PMIC, the PMIC may

[0065] In some embodiments, in order to reduce the EL current of the display screen, the electronic device can perform current limiting processing on the EL current of the display screen through the DDIC. For example, when the DDIC controls the display panel to display a frame image, the DDIC can press down the gamma curve according to the curve gain value, and then perform brightness adjustment on the image through the pressed-down gamma curve, so as to reduce the brightness of the image, such as reducing the brightness of the bright area in the image, thereby reducing the EL current of the display screen.

[0066] Referring to FIG. 5, a flowchart of a related process of current limiting of the DDIC is shown. As shown in FIG. 5, the flowchart includes: the DDIC 221 stores a current frame image (mobile industry processor interface (MIPI) image data) to a static random access memory (SRAM) (S51), performs display stream compression (DSC), sub pixel rearrangement (SPR) processing for pixel rearrangement, gamma acquisition, demura processing, and IR-drop processing on the current frame image (S52-S56), so as to obtain a driving signal of the current frame image, such as a source voltage of each pixel. Further, the driving signal of the current frame image is converted (source OP) (S57), such as digital-to-analog conversion of the source voltage of each pixel in the driving signal, so as to control the display panel 222 to display the current frame image using the driving signal of the current frame image.

[0067] In addition, as shown in FIG. 5, the DDIC 221 can perform luminance detection on the current frame image based on the MCU or the ACL IP in parallel while performing the demura processing (S55), and determine whether the luminance of the current frame image is greater than a set luminance, i.e., the ACL IP performs luminance comparison current limiting / MCU performs luminance calculation and comparison (S58). If it is detected that the luminance of the current frame is greater than the set luminance, it means that the luminance of the current frame image is large and is likely to cause overcurrent of the display screen. However, since there is a delay in the curve gain value (gain) and the DBV value in the luminance adjustment instruction corresponding to the current frame image issued by the AP 210 (S510), the DDIC 221 can adjust the luminance of the current frame image according to the gamma curve corresponding to the previous frame image, i.e., the current frame image is not subjected to current limiting processing. Further, the DDIC 221 receives the next frame image, and then adopts the curve gain value (gain) corresponding to the previous frame image to depress the corresponding gamma curve, and then adjusts the luminance of the next frame image based on the depressed gamma curve (S59 next frame gamma depression), i.e., the next frame image is subjected to current limiting processing. In this way, when the current frame image needs to exit the APL mode, the gamma curve in the APL mode does not exit, and the current frame image is not subjected to current limiting processing, which will cause the EL current of the display screen to be too large when displaying the current frame image.

[0068] To reduce the EL current of the display screen, embodiments of the present application provide a display control method. In the method, the DDIC does not perform current limiting processing according to the curve gain value in the luminance adjustment instruction issued by the AP, that is, does not need to perform down-pressing processing on the gamma curve. Instead, the DDIC determines whether current limiting processing needs to be performed on the current frame image by comparing the luminance of the current frame image with the preset total luminance, such as the luminance in the high brightness mode (HBM). When it is determined that current limiting processing needs to be performed on the current frame image, the DDIC adjusts the source voltage of the pixel to limit the EL current of the pixel.

[0069] It can be understood that the HBM is a working mode of the display screen, which aims to improve the visibility of the display screen in outdoor or strong light environment. In this mode, the display screen can increase the luminance output to realize clearer and more visible display image. Therefore, when the high brightness mode is activated, the image displayed by the display screen will be brighter than in the standard luminance mode. The HBM luminance refers to the luminance of the image (denoted as HBM image) displayed by the display screen in the HBM mode, and the HBM luminance is also referred to as the HBM total luminance.

[0070] In some embodiments, the above-mentioned preset total luminance can be a luminance with a small difference from the HBM luminance, such as a luminance with a difference from the HBM luminance less than or equal to a preset threshold, which is a small value set according to actual needs.

[0071] Specifically, after the DDIC obtains the source voltage of each pixel by performing the first processing, such as the voltage drop (IR-Drop) processing, on the current frame image, the DDIC detects the luminance of the current frame image and determines whether the luminance is greater than the HBM luminance. If the luminance is greater than the HBM luminance, it indicates that displaying the current frame image at the luminance may cause a large EL current, and current limiting processing needs to be performed on the current frame image. At this time, the source voltage difference of each pixel at the luminance of the current frame image can be compared with the source voltage difference of each pixel at the HBM luminance to obtain the inverse compensation value of each pixel. Then, the inverse compensation value of each pixel is used to perform inverse compensation processing on the source voltage of each pixel to reduce the source voltage of each pixel and reduce the EL current in each pixel. Finally, the display panel displays the current frame image based on the source voltage of each pixel after the inverse compensation processing. In this way, the present application inversely compensates the luminance of each pixel by inversely compensating the source voltage of each pixel, so that the luminance of the current frame image after the inverse compensation does not exceed the HBM luminance. Thus, current limiting processing is performed on the current frame image, so that the display panel does not occur overcurrent phenomenon when displaying the current frame image.

[0072] In addition, as the pixel structure described in FIG. IB, the pixel in the display panel is compensated by the present application, including: calculating the voltage difference between the ELVDD voltage and the source voltage of the pixel under the brightness of the current frame image, obtaining the source voltage difference of the pixel under the brightness; and, calculating the source voltage difference of the pixel under the HBM brightness; calculating the difference between the source voltage difference of the pixel under the brightness of the current frame image and the source voltage difference of the pixel under the HBM brightness, obtaining the compensation value of the pixel; subtracting the compensation value (such as the absolute value of the compensation value) from the source voltage of the pixel to obtain the source voltage of the pixel after the compensation. Thus, the source voltage of the pixel in the current frame image does not exceed the source voltage of the pixel under the HBM brightness, reducing the source voltage difference of the pixel after the compensation, thereby reducing the EL current of the pixel.

[0073] It can be understood that, since the above-mentioned voltage drop (IR-Drop) processing, compensation processing and conversion processing are executed in series, the current limiting processing can be guaranteed to be performed while adjusting the brightness of the current frame image. For example, when the current frame image needs to exit the APL mode, the current limiting processing can be performed in real time on the current frame image, thereby avoiding the phenomenon that the EL current in the display screen is too large when exiting the APL mode, and reducing the use risk of the display screen.

[0074] Specifically, referring to FIG. 6, a flow of the DDIC provided by the embodiment of the present application for current limiting processing. The difference between the flow shown in FIG. 6 and FIG. 5 is that the flow shown in FIG. 6 does not need to perform the brightness detection in S58 while performing the non-uniform processing in S55, but performs the source compensation current limiting algorithm in S511 after performing the voltage drop processing in S56 to perform the brightness compensation on the current frame image. In addition, the flow does not need to perform S59, that is, does not need to perform the curve depression on the gamma curve. In some embodiments, the above-mentioned source compensation current limiting algorithm can be executed by the MCU or the algorithm unit such as the algorithm IP in the DDIC 221 shown in FIG. 2.

[0075] Specifically, as shown in FIG. 6, the source reverse compensation current limiting algorithm in S511 includes: the DDIC 221 detects the brightness of the current frame image (S511a), obtains the HBM brightness (S511b), compares the brightness of the current frame image with the HBM brightness (S511c), and determines whether the brightness of the current frame image is greater than the HBM brightness (S511d); if the brightness of the current frame image is greater than the HBM brightness, the source pressure difference of each pixel in the compensation image of the current frame and the source pressure difference of each pixel under the HBM brightness are determined, and the reverse compensation value of each pixel is determined, and then the brightness of each pixel is reverse compensated according to the reverse compensation value of each pixel, so that the brightness of the current frame image after reverse compensation is less than the HBM brightness (S511e and S511f). Further, after reverse compensating the brightness of the current frame image, the conversion processing in S57 can be continued, that is, S511f is executed and then S57 is executed. In addition, if the brightness of the current frame image is less than or equal to the HBM brightness, the conversion processing in S57 is continued.

[0076] In this way, the DDIC in the present application can monitor the brightness of the image frame by frame, compare the brightness of each frame image with the HBM brightness, calculate the source pressure difference of each pixel in the display screen and the reverse compensation value, and limit the source voltage of each pixel through the reverse compensation value, so as to limit the EL current of each pixel. In this way, the EL current of the display screen displaying each frame image can be accurately limited, the use risk of the display screen is reduced, and the situation of brightness jump of the display screen is avoided.

[0077] Next, referring to FIG. 7, a display control method provided by an embodiment of the present application is described, which can be executed by the AP 210 in the electronic device shown in FIG. 2, and the DDIC 221 and the display panel 222 in the display screen 220.

[0078] Specifically, as shown in FIG. 7, the method includes:

[0079] S701: The AP 210 sends a first image to the DDIC 221.

[0080] In some embodiments, the first image is an image compressed according to the display serial interface (DSI) technology after the AP 210 performs drawing, rendering, layer superposition and the like on a frame of image data. For example, the DSI technology can perform image compression on the image data according to the display stream compression (DSC) standard, such as compressing the data amount of the synthesized image to 1 / 3 of the data amount to obtain a compressed image.

[0081] In some embodiments, the AP 210 can perform APL calculation on the image data of the first image while compressing the image data of the first image, such as calculating the APL area of the first image, and determining whether the APL area meets the APL mode triggering condition. For example, the APL mode triggering condition indicates that the APL area is small, such as the APL area ≤ 20% of the panel pixel area in the above example, or the APL area ≤ 25% of the panel pixel area, and the like, which are not limited in the embodiments of the present application.

[0082] In some embodiments, the area of the bright region in the first image can be large, such as the APL area is 30% of the panel pixel area, that is, the APL area of the first image can not meet the APL mode triggering condition (such as ≤ 20% of the panel pixel area), so the first image needs to exit the APL mode. However, in actual application, since the Hiace algorithm for calculating APL has a delay, the APL area of the first image has not been calculated when the AP 210 sends the first image to the DDIC 221. At this time, the first image needs to exit the APL mode, and needs to use the brightness adjustment instruction in the non-APL mode corresponding to the first image to adjust the first image, but the brightness adjustment instruction will be delayed due to the delay of the Hiace algorithm, that is, the first image cannot receive the brightness adjustment instruction in the non-APL mode when in the APL mode.

[0083] S702: The DDIC 221 performs first processing on the first image to obtain a first driving signal, and the first driving signal includes a signal of the source voltage of each pixel.

[0084] In some embodiments, the signal in the driving signal (such as the first driving signal) of the first image is not limited to the signal of the source voltage, but also includes the signals of the ELVDD voltage and the ELVSS voltage, and the like, which are not limited in the embodiments of the present application.

[0085] In some embodiments, the first processing further includes display stream compression (DSC) processing, sub-pixel rearrangement (SPR) processing, gamma curve acquisition, demura processing, and IR-drop processing, and the like.

[0086] In some embodiments, the DDIC 221 has stored the DBV value (denoted as the first display brightness value) corresponding to the previous frame image and the gamma curve corresponding to the DBV value before receiving the first image. At this time, the DDIC 221 can perform brightness adjustment on the first image according to the gamma curve corresponding to the previous frame image.

[0087] It can be understood that the first display brightness is a display brightness value corresponding to the previous frame image of the first image, for example, the first display brightness value is greater than a preset brightness value, and the preset brightness value can be greater than 3052, such as the first display brightness value being 4095.

[0088] It can be understood that if the brightness adjustment instruction corresponding to the previous frame image is a brightness adjustment instruction in the APL mode, the gamma curve corresponding to the previous frame image is used to adjust the brightness of the first image, and the APL technology is used to highlight the bright area in the first image. For example, the DDIC 221 adjusts the brightness of the first region (i.e., the bright region) in the first image to the first brightness, and adjusts the brightness of the region outside the first region in the first image to the second brightness, and the first region brightness is greater than the second brightness, such as the first brightness being the maximum brightness. At this time, the first brightness corresponds to the DBV value (i.e., the first display brightness value) in the APL mode.

[0089] Then, in the case of using the APL technology to highlight the bright area in the first image, if the area of the bright region in the first image is large, i.e., the APL area is large, the brightness of the first image after brightness adjustment using the APL technology can be high, and displaying the adjusted first image can cause the EL current in the display screen to be too large.

[0090] S703: The DDIC 221 detects that the total brightness of the first image is the first total brightness.

[0091] In some embodiments, there is a relationship between the source voltage of a pixel and the brightness of the pixel. As an example, the DDIC 221 can detect the source voltage of each pixel in the first image, and determine the brightness of each pixel according to the mapping relationship between the source voltage and the brightness, and then sum the brightness of each pixel to obtain the total brightness of the first image, such as the first total brightness.

[0092] S704: The DDIC 221 obtains the HBM brightness.

[0093] The HBM brightness can be the total brightness of the display screen in the HBM mode, i.e., the total brightness of the HBM.

[0094] In some embodiments, the HBM brightness can be pre-burned in the DDIC 221, such as being burned in the SRAM of the DDIC 221. For example, the DDIC 221 can obtain the pre-burned HBM brightness from the SRAM.

[0095] As an example, the DDIC 221 can detect the source voltage of each pixel in the HBM image, and determine the brightness of each pixel according to the mapping relationship between the source voltage and the brightness, and then take the sum of the brightness of each pixel as the total brightness of the HBM image, such as the HBM brightness (also referred to as the HBM total brightness). Wherein, the HBM image can be a pre-set image with HBM brightness.

[0096] S705: The DDIC 221 determines whether the first total brightness is greater than the HBM brightness.

[0097] If the first total brightness is greater than the HBM brightness, proceed to S706 for inverse compensation processing; if the first total brightness is less than or equal to the HBM brightness, proceed to S709 for subsequent image processing of the first image.

[0098] S706: The DDIC 221 calculates the source voltage difference of each pixel under the first total brightness, and calculates the source voltage difference of each pixel under the HBM brightness.

[0099] In some embodiments, the source voltage difference of a pixel is calculated by the following formula: source voltage difference = source voltage - ELVDD voltage.

[0100] S707: The DDIC 221 determines the inverse compensation value of each pixel according to the source voltage difference of each pixel under the first total brightness and the source voltage difference of each pixel under the HBM brightness.

[0101] In some embodiments, the inverse compensation value of a pixel in the first image can be the absolute value of the difference between the source voltage difference of the pixel and the source voltage difference of the pixel at the same position in the HBM image.

[0102] In some embodiments, there is a mapping relationship between the source voltage difference of a pixel and the brightness of the pixel. Then, the brightness of the first image can be represented by the sum of the source voltage difference of each pixel, and the brightness of the HBM image (i.e. the HBM brightness) can also be represented by the sum of the source voltage difference of each pixel. Then, the inverse compensation value of each pixel in the first image can represent the difference between the brightness of the first image and the brightness of the HBM image.

[0103] Therefore, in order to perform current limiting processing on the first image, the brightness of the first image can be adjusted to be less than or equal to the brightness of the HBM brightness. At this time, the inverse compensation value of each pixel in the first image is used to adjust the source voltage of each pixel, so as to adjust the source voltage difference of each pixel, thereby adjusting the brightness of each pixel.

[0104] S708: The DDIC 221 performs inverse compensation on the source voltage of each pixel in the first driving signal according to the inverse compensation value of each pixel to obtain a second driving signal.

[0105] Thus, the brightness of the first image is adjusted from the first total brightness to a second total brightness, where the second total brightness is less than or equal to the HBM brightness.

[0106] In some embodiments, the difference between the source voltage difference of a dark pixel in the first image and the source voltage difference of the pixel in the HBM image is large, and the difference between the source voltage difference of a bright pixel in the first image and the source voltage difference of the pixel in the HBM image is relatively small, so that the inverse compensation value of the dark pixel in the first image will be greater than the inverse compensation value of the bright pixel. Thus, when adjusting the brightness of the first image by the compensation value of each pixel, the brightness of all pixels in the first image is reduced, and the effect of the APL technology on the first image is ensured, i.e., the HDR effect of the displayed first image is high.

[0107] In some embodiments, the DDIC 221 can subtract the corresponding inverse compensation value from the source voltage of each pixel to perform inverse compensation on the source voltage of each pixel, i.e., to reduce the source voltage of each pixel, so as to reduce the source voltage difference of each pixel and thus reduce the EL current of each pixel. In this way, the second total brightness of the first image is less than or equal to the HBM brightness, ensuring that the display screen will not overcurrent when displaying the first image subsequently.

[0108] It can be understood that the source voltage of a pixel in the first driving signal can be referred to as a first source voltage, and the source voltage of a pixel in the second driving signal can be referred to as a second source voltage, where the second source voltage is less than the first source voltage. The first source voltage corresponds to the first total brightness of the first image, and the second source voltage corresponds to the second total brightness of the first image.

[0109] S709: The DDIC 221 performs conversion processing to obtain a third driving signal.

[0110] In some embodiments, the DDIC 221 can perform digital-to-analog conversion, signal amplification, impedance matching, and other conversion processing on the second driving signal to obtain the third driving signal, such as digital-to-analog conversion, signal amplification, impedance matching, and other processing on the source voltage of each pixel in the second driving signal.

[0111] When it is determined in S705 that the first total brightness is greater than the HBM brightness, the DDIC 221 can perform conversion processing on the second driving signal to obtain a third driving signal. At this time, the first total brightness of the first image is relatively large, and displaying the first image with the first total brightness can cause the EL current of the display screen to be too high, and the above-mentioned reverse compensation algorithm needs to be used for current limiting processing. When it is determined in S705 that the first total brightness is less than or equal to the HBM brightness, the DDIC 221 can perform conversion processing on the first driving signal to obtain the third driving signal. At this time, the second total brightness of the first image is relatively small, and the EL current of the display screen is relatively small when the first image with the second total brightness is displayed, and current limiting processing is not needed.

[0112] S710: The DDIC 221 controls the display panel 222 to display the first image based on the third driving signal.

[0113] In some embodiments, when the third driving signal drives the display panel 222 to display the first image, the brightness of the first region in the display panel 222 is the third target brightness, and the brightness of the regions other than the first region is the second target brightness. The first target brightness is greater than the second target brightness, and the first region can be a region corresponding to the APL area in the first image (i.e., a high-brightness region). In this way, the brightness of the bright region of the first image displayed by the display screen is relatively high, meeting the requirements of the HDR technology and having a relatively high display effect.

[0114] It can be understood that, since the DDIC can perform reverse compensation on the source voltage of each pixel in the display panel in real time before displaying the first image, the EL current of each pixel can be reduced by reducing the source voltage of each pixel, thereby achieving current limiting processing on each pixel. In this way, the brightness of the first image is ensured to be no more than the HBM brightness, so that the EL current of the display screen will not be too large when the first image is displayed.

[0115] In addition, when the first image needs to exit the APL mode, even if the AP delays the issuance of the brightness adjustment instruction of the first image, i.e., delays the issuance of the DBV value and the curve gain value corresponding to the first image, the DDIC can perform reverse compensation on the source voltage of each pixel in real time according to the HBM brightness to perform current limiting processing on each pixel, thereby avoiding the EL current in the display screen being too large. Thus, while ensuring that the displayed first image meets the requirements of the HDR technology, current limiting processing is achieved on the display screen.

[0116] In addition, the DDIC in the present application can perform brightness detection and current limiting processing according to each frame of image, so that the DDIC can be matched with a PMIC with relatively small current supply capability to achieve relatively high brightness of the display screen.

[0117] Referring to FIG. 8, S702 in FIG. 7 is described in detail as shown in FIG. 8. S702 includes:

[0118] S702a: The DDIC 221 performs display stream compression (DSC) processing on the first image to obtain decompression data.

[0119] For example, when the AP 210 compresses the data volume of the image data by 1 / 3 using the DSC technology, the DDIC 221 decompresses the first image using the DSC technology, and can restore the data volume from 1 / 3 to a larger data volume to obtain the decompression data of the first image.

[0120] S702b: The DDIC 221 performs sub-pixel rearrangement (SPR) processing on the decompression data of the first image to obtain rearrangement data of the first image.

[0121] It can be understood that the SPR technology is used to improve the visual effect of the display screen, especially when the pixel arrangement is not standard RGB. For example, in some display screens, due to the limitations of manufacturing processes, the number of red and blue sub-pixels can be less than that of green sub-pixels. The SPR technology adjusts the image data through an algorithm, so that the non-standard pixel arrangement looks closer to the real RGB color, thereby improving the display effect.

[0122] In some embodiments, the pixels inside the display panel can not be arranged in a real red green blue (RGB) color mode: one pixel includes three sub-pixels R, G, and B, that is, the three sub-pixels R, G, and B are lit, and this pixel displays white. One pixel inside the display panel can be composed of at least one of the three sub-pixels R, G, and B, for example, one pixel 1 includes one R sub-pixel and one G sub-pixel, and another pixel 2 includes one B sub-pixel and one G pixel. The SPR processing can achieve “borrowing” the B sub-pixel of the pixel 2 to “supplement” the missing B pixel of the pixel 1, and lighting the B sub-pixel of the pixel 2 to form a white pixel 1.

[0123] S702c: The DDIC 221 performs gamma curve acquisition.

[0124] In some embodiments, after the AP 210 sends the compressed image of the current frame, the corresponding brightness adjustment instruction is delayed to be sent, and at this time, the DDIC 221 can acquire the gamma curve corresponding to the previous frame image stored in the SRAM, such as the gamma curve in the APL mode.

[0125] S702d: The rearrangement data of the first image is subjected to demura processing based on the gamma curve to obtain uniform data of the first image.

[0126] It can be understood that the Demura processing is a technology for eliminating the display brightness unevenness phenomenon (i.e., Mura phenomenon). In the Demura processing, the gray scale value or voltage (e.g., source voltage) of the pixel in the display screen in the brightness uneven area (i.e., Mura area) is adjusted according to the mapping relationship of the gamma curve, so that the area with brightness unevenness is compensated, and a more uniform display effect is achieved.

[0127] S702e: The DDIC 221 performs voltage drop (IR-drop) processing on the uniform data of the first image to obtain a first driving signal corresponding to the first image.

[0128] The voltage drop processing is to compensate for the voltage drop caused by the current flow. In some embodiments, the voltage drop of a pixel can be the voltage drop caused by the EL current of the pixel flowing through the impedance of the switch tube in the pixel. In some embodiments, the DDIC 221 can compensate for the source voltage of each pixel in the uniform image of the current frame by using the voltage drop (IR-drop) technology to obtain a compensated image of the current frame. In this way, the influence of the impedance in the display screen on the source voltage, i.e., the influence of the impedance in the display screen on the brightness of the picture of the current frame, can be eliminated.

[0129] In some embodiments, the above-mentioned voltage drop processing can compensate for the voltage lost due to the impedance by using a voltage compensation value. For example, the voltage drop value of the voltage drop of the center pixel point of the active area in the full white picture can be used as the voltage compensation value. In this way, the voltage on the ELVDD of the pixel during compensation can be expressed as ELVDD = ELVDD' + IR, where ELVDD' is the voltage before compensation, and IR is the compensation voltage value. At this time, the first driving signal corresponding to the first image can include the signal of the ELVDD voltage after the voltage drop processing, i.e., the signal of the ELVDD voltage of each pixel.

[0130] In this way, the DDIC in the present application can perform optimization processing on the first image by using the SPR processing, demura processing, and other processing, and then reduce the source voltage of each pixel to reduce the source voltage difference of each pixel, so as to perform current limiting processing on the pixel. Thus, the first image has a good display effect, and the display screen does not have an overcurrent phenomenon.

[0131] In some embodiments, the AP in the present application can also be replaced by other processing chips or processing units such as SoC. In some embodiments, the AP can be integrated in the SoC or other processing chips or processing units. In other embodiments, the AP is independent of the SoC or other processing chips or processing units.

[0132] In some embodiments, the DDIC in the present application can also be replaced by other display internal driving chip or processing unit. In some embodiments, the other display internal driving chip or processing unit can be integrated with the DDIC. In other embodiments, the DDIC can be independent of the other display internal driving chip or processing unit.

[0133] In other embodiments, the AP in the present application can include a processor, a memory and a communication interface. In other embodiments, the DDIC in the present application can include a processor, a memory and a communication interface. The processor includes one or more CPUs, for example. When the processor includes one CPU, the CPU can be a single-core CPU or a multi-core CPU. The memory includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read only memory (EPROM), or a compact disc read-only memory (CD-ROM). The memory is used to store relevant computer programs and data. The communication interface is used to receive and / or send information, for example, to transmit instructions and / or data between the AP and the DDIC. The communication can be, for example, but not limited to, a mobile industry processor interface (MIPI), a high-definition multimedia interface (HDMI), etc.

[0134] Referring to FIG. 9, a hardware structure schematic diagram of the electronic device 100 provided by the embodiments of the present application is shown.

[0135] As shown in FIG. 9, the electronic device 100 can include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, a headset jack 170D, a sensor module 180, a key 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a subscriber identification module (SIM) card interface 195, etc. The sensor module 180 can include a pressure sensor 180A, a gyro sensor 180B, a barometric pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, etc.

[0136] It can be understood that the structure shown in the embodiments of the present application does not constitute a specific limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 can include more or fewer components than shown, or combine certain components, or split certain components, or different arrangement of components. The components shown can be implemented in hardware, software, or a combination of software and hardware.

[0137] The processor 110 can include one or more processing units, for example: the processor 110 can include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), a data processing unit (DPU), etc. Different processing units can be independent devices, or can be integrated in one or more processors. For example, the above-mentioned multiple processing units are integrated in one system on chip (SoC), or the AP is a separate semiconductor chip and the other processing units are integrated in one SoC, which is not limited in the present application.

[0138] The controller can generate operation control signals according to the instruction operation code and the timing signal, to complete the control of fetching and executing instructions.

[0139] The processor 110 can also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory can store instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to use the instructions or data again, it can be directly called from the memory. This avoids repeated access and reduces the waiting time of the processor 110, thereby improving the efficiency of the system.

[0140] In some embodiments, the processor 110 can include one or more communication interfaces (referred to as interfaces). The interface may, for example but not limited to, include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a MIPI, a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface, etc.

[0141] The MIPI interface can be used to connect the processor 110 to peripheral devices such as the camera 193 and the display screen 194.

[0142] In some embodiments, the MIPI interface can include a display serial interface (DSI), a camera serial interface (CSI), etc. Optionally, the processor 110 and the camera 193 communicate through the CSI interface to realize the photographing function of the electronic device 100. Optionally, the processor 110 and the display screen 194 communicate through the DSI interface to realize the display function of the electronic device 100.

[0143] It can be understood that the interface connection relationship between the modules shown in the embodiments of the present application is only illustrative and does not constitute a limitation on the structure of the electronic device 100. In other embodiments of the present application, the electronic device 100 can also use different interface connection modes or a combination of multiple interface connection modes in the above embodiments.

[0144] The charging management module 140 is configured to receive charging input from a charger. The charger can be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 can receive charging input from a wired charger through the USB interface 130. In some wireless charging embodiments, the charging management module 140 can receive wireless charging input through a wireless charging coil of the electronic device 100. The charging management module 140 can charge the battery 142 and supply power to the electronic device through the power management module 141.

[0145] The power management module 141 is configured to connect the battery 142, the charging management module 140, and the processor 110. The power management module 141 receives input from the battery 142 and / or the charging management module 140 to supply power to the processor 110, the internal memory 121, the display screen 194, the camera 193, and the wireless communication module 160. The power management module 141 can also be configured to monitor parameters such as battery capacity, battery cycle count, and battery health status (leakage, impedance). For example, the power management module 141 includes a power management integrated circuit (PMIC) to monitor these parameters. In other embodiments, the power management module 141 can also be arranged in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 can also be arranged in the same device.

[0146] The wireless communication function of the electronic device 100 can be realized through the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, the modem processor, and the baseband processor.

[0147] The antenna 1 and the antenna 2 are configured to transmit and receive electromagnetic wave signals. The mobile communication module 150 can provide a solution for wireless communication including 2G / 3G / 4G / 5G and the like applied to the electronic device 100. The modem processor can include a modulator and a demodulator. The modulator is configured to modulate a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is configured to demodulate a received electromagnetic wave signal into a low-frequency baseband signal.

[0148] The wireless communication module 160 can provide solutions for wireless communication, including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR) technology, and the like, which are applied to the electronic device 100.

[0149] The electronic device 100 can implement a display function through a GPU, a DPU, a display screen 194, and an AP, and the like. In some embodiments, the GPU is a microprocessor for image processing, connected to the display screen 194 and the AP. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The DPU is used to superimpose multiple layers / windows. The processor 110 can include one or more GPUs that execute program instructions to generate or change display information.

[0150] The display screen 194 is used to display images, videos, and the like. The display screen 194 can include a display driver integrated circuit (DDIC) and a display panel. The DDIC is a device (such as a chip) inside the display screen 194 for controlling the operation of the display screen 194. For example, the DDIC can generate certain electrical signals to control the display panel to display images. The display panel can adopt a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED), a flex light-emitting diode (FLED), a Miniled, a MicroLed, a Micro-oLed, a quantum dot light emitting diode (QLED), and the like. In some embodiments, the electronic device 100 can include one or N display screens 194, and N is a positive integer greater than 1. In some embodiments, one display screen 194 can include one or N DDICs.

[0151] The electronic device 100 can implement a photographing function through an ISP, a camera 193, a video codec, a GPU, a display 194, an AP, and the like.

[0152] The camera 193 is used to capture still images or videos. An object projects an optical image through a lens to a photosensitive element. The photosensitive element can be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The photosensitive element converts the optical signal into an electrical signal, and then transmits the electrical signal to an ISP to convert into a digital image signal. The ISP outputs the digital image signal to a DSP for processing. The DSP converts the digital image signal into an image signal in a standard format such as RGB, YUV, and the like. In some embodiments, the electronic device 100 can include one or N cameras 193, where N is a positive integer greater than 1.

[0153] A digital signal processor is used to process digital signals, in addition to being able to process digital image signals, it can also process other digital signals.

[0154] A video codec is used to compress or decompress digital videos. The electronic device 100 can support one or more video codecs.

[0155] An NPU is a neural-network (NN) computing processor that learns from the structure of a biological neural network, such as the transmission mode between human brain neurons, to quickly process input information and continuously self-learn. Through the NPU, the electronic device 100 can implement intelligent cognitive applications such as image recognition, face recognition, speech recognition, text understanding, and the like.

[0156] An external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device 100.

[0157] The internal memory 121 can be used to store computer executable program codes including instructions. The internal memory 121 can include a program storage area and a data storage area. The program storage area can store an operating system, at least one application program (such as a sound play function, an image play function, etc.) required by at least one function, etc. The data storage area can store data (such as audio data, a phone book, etc.) created during use of the electronic device 100, etc. In addition, the internal memory 121 can include a high-speed random access memory, and can further include a non-volatile memory such as at least one magnetic disk storage device, a flash memory device, a universal flash storage (UFS), etc. The processor 110 performs various function applications and data processing of the electronic device 100 by executing instructions stored in the internal memory 121 and / or instructions stored in a memory disposed in the processor.

[0158] The electronic device 100 can implement an audio function through an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, a headphone interface 170D, an application processor, etc. For example, music play, recording, etc.

[0159] The audio module 170 is used to convert digital audio information into an analog audio signal output, and is also used to convert an analog audio input into a digital audio signal. The audio module 170 can also be used to encode and decode an audio signal. In some embodiments, the audio module 170 can be disposed in the processor 110, or part of the function modules of the audio module 170 can be disposed in the processor 110.

[0160] The keys 190 include a power-on key, a volume key, etc. The keys 190 can be mechanical keys. They can also be touch keys. The electronic device 100 can receive key input and generate key signal input related to user settings and function control of the electronic device 100.

[0161] The motor 191 can generate a vibration prompt. The motor 191 can be used for incoming call vibration prompt, and can also be used for touch vibration feedback.

[0162] The indicator 192 can be an indicator light, which can be used to indicate a charging state, a power change, and can also be used to indicate a message, a missed call, a notification, etc.

[0163] Embodiments of the mechanisms disclosed herein can be implemented in hardware, software, firmware, or any combination thereof. Embodiments of the application can be implemented as computer programs or program codes running on programmable systems including at least one processor, a storage system (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device.

[0164] The program code can be applied to input instructions to perform the functions described in this application and generate output information. The output information can be applied to one or more output devices in a known manner. For the purposes of this application, a processing system includes any system that has a processor, such as a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), or a microprocessor.

[0165] The program code can be implemented in a high-level procedural or object-oriented programming language to communicate with a processing system. The program code can be implemented in assembly or machine language, if desired. In fact, the mechanisms described in this application are not limited to any particular programming language. In any case, the language can be a compiled or interpreted language.

[0166] In some cases, the disclosed embodiments can be implemented in hardware, firmware, software, or any combination thereof. The disclosed embodiments can also be implemented as instructions carried by or stored on a transitory or non-transitory machine-readable (e.g., computer-readable) storage medium, which can be read and executed by one or more processors. For example, the instructions can be distributed over the network or by other computer readable media. Thus, a machine-readable medium can include any mechanism for storing or transmitting information in a form readable by a machine (e.g., a computer), including without limitation, a floppy disk, an optical disc, an optical compact disc read-only memory (CD-ROM), a magneto-optical disk, read-only memory (ROM), random access memory (RAM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), magnetic or optical cards, a flash memory, or a tangible, machine-readable storage used in the transmission of information over the Internet via electrical, optical, acoustical or other forms of propagated signals (e.g., carrier waves, infrared signals, digital signals, etc.). Accordingly, the machine-readable medium includes any type of mechanical or tangible implementation that is adapted to store, communicate, or transmit information in a form readable by a machine (e.g., a computer).

[0167] In the drawings, some of the structures or method features can be shown in particular arrangements and / or orders. However, it should be understood that such specific arrangements and / or orders can not be required. Instead, these features can be arranged in a different manner and / or order than shown in the illustrative drawings, in some embodiments. Additionally, inclusion of a structural or method feature in a particular figure is not meant to imply that such feature is required in all embodiments, and in some embodiments, such feature can not be included or can be combined with other features.

[0168] It should be noted that each unit / module mentioned in the embodiments of the devices of the present application is a logical unit / module, and in physical form, one logical unit / module can be a physical unit / module, or a part of a physical unit / module, or a combination of multiple physical unit / modules, and the physical implementation form of the logical unit / module itself is not the most important, and the combination of the functions implemented by these logical units / modules is the key to solving the technical problems proposed in the present application. In addition, in order to highlight the innovative part of the present application, the above-mentioned embodiments of the devices of the present application do not introduce units / modules that are not closely related to solving the technical problems proposed in the present application, which does not mean that the above-mentioned device embodiments do not have other units / modules.

[0169] It should be noted that in the examples and descriptions of the present patent, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including one" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0170] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that various changes in form and detail can be made therein without departing from the spirit and scope of the present application.

Claims

1. A display control method applied to a display screen, characterized by, The display screen comprises a display driving chip (DDIC) and a display panel, the display panel comprises a plurality of pixel units, the pixel unit comprises a first common electrode and a source level, and the method comprises: acquiring a first image to be displayed, and determining that the total brightness of the first image is a first total brightness, wherein the source voltage of the pixel unit corresponding to the first total brightness of the first image is a first source voltage; corresponding to the first total brightness being greater than a preset total brightness, inversely compensating the first source voltage of the pixel unit to obtain a second source voltage, wherein under the second source voltage, the total brightness of the first image displayed by the plurality of pixel units is a second total brightness, and the second total brightness is less than or equal to the preset total brightness; controlling the display panel to display the first image based on the second source voltage of the pixel unit.

2. The method of claim 1, wherein, The inverse compensation of the first source voltage of the pixel unit to obtain a second source voltage comprises: determining that the pressure difference of the pixel unit under the first total brightness is a first pressure difference, and the pressure difference of the pixel unit under the preset total brightness is a second pressure difference, and determining the inverse compensation value of the pixel unit according to the first pressure difference and the second pressure difference of the pixel unit, wherein the pressure difference is the voltage difference between the source level of the pixel unit and the voltage of the first common electrode; adjusting the source voltage of the pixel unit from the first source voltage to the second source voltage according to the inverse compensation value of the pixel unit, so that the total brightness of the first image is adjusted from the first total brightness to the second total brightness.

3. The method of claim 2, wherein, The determination of the inverse compensation value of the pixel unit according to the first pressure difference and the second pressure difference of the pixel unit comprises: taking the absolute value of the difference between the first pressure difference and the second pressure difference of the pixel unit as the inverse compensation value of the pixel unit; and the adjustment of the source voltage of the pixel unit from the first source voltage to the second source voltage according to the inverse compensation value of the pixel unit comprises: subtracting the corresponding inverse compensation value from the first source voltage of the source voltage of the pixel unit to obtain the second source voltage of the pixel unit.

4. The method of claim 1, wherein, The method further comprises: performing first processing on the first image to obtain the first source voltage of the pixel unit, wherein the first processing comprises at least one of the following: decompression processing, sub-pixel unit rearrangement processing, gamma curve acquisition, brightness unevenness compensation processing, and voltage drop processing.

5. The method of claim 4, wherein, The first source voltage of the pixel unit is the source voltage obtained after the voltage drop processing on the first image.

6. The method of claim 1, wherein, The first processing on the first image to obtain the first source voltage of the pixel unit comprises: performing decompression processing on the first image to obtain decompressed data; performing sub-pixel rearrangement processing on the decompressed data to obtain rearranged data; acquiring a gamma curve corresponding to a first display brightness value, wherein the first display brightness is a display brightness value corresponding to a previous frame of the first image, and the first display brightness value is greater than a preset brightness value; Compensate the rearranged data based on the gamma curve to obtain uniform data; Perform voltage drop processing on the uniform data to obtain a first driving signal, wherein the first driving signal includes the first source voltage of the pixel unit.

7. The method of claim 6, wherein, The method further includes: updating the first source voltage of the pixel unit in the first driving signal to the second source voltage to obtain a second driving signal; performing conversion processing on the second driving signal to obtain a third driving signal, wherein the second source voltage in the third driving signal is an analog signal; and the method of controlling the display panel to display the first image based on the second source voltage of the pixel unit includes: controlling the display panel to display the first image based on the third driving signal.

8. The method of claim 6, wherein, The method further includes: receiving a second display brightness value corresponding to the first image from an application processor (AP), wherein the second display brightness value is less than or equal to the preset display brightness value, the second display brightness value is received from the AP after the display panel displays the first image, the first image does not satisfy a first dimming condition, and the first dimming condition includes that a proportion of an area of a first region in the first image to an area of the display panel is less than or equal to a preset proportion, and a brightness of pixels in the first region is greater than a brightness threshold.

9. The method of claim 8, wherein, a total brightness corresponding to the first image is the second total brightness, a brightness of a pixel unit in the first region in the first image is a first brightness, and a brightness of a pixel unit in a second region in the first image other than the first region is a second brightness, the first brightness is greater than the second brightness, and the first brightness corresponds to the first display brightness value.

10. The method according to any one of claims 1 to 9, characterized in that, The preset total brightness is a total brightness of the plurality of pixel units in a high brightness mode (HBM).

11. An electronic device, comprising: The electronic device includes an application processor (AP) and a display screen, the display screen includes a display driving chip (DDIC) and a display panel, the display panel includes a plurality of pixel units, the pixel unit includes a first common electrode and a source level, and The AP is configured to send a first image to be displayed to the DDIC. The DDIC is configured to receive the first image from the AP and determine that a total brightness of the first image is a first total brightness, wherein a source voltage of the pixel unit corresponding to the first total brightness of the first image is a first source voltage. The DDIC is configured to perform inverse compensation on the first source voltage of the pixel unit to obtain a second source voltage, in response to the first total brightness being greater than a preset total brightness, wherein a total brightness of the first image displayed by the plurality of pixel units under the second source voltage is a second total brightness, and the second total brightness is less than or equal to the preset total brightness. The DDIC is configured to control the display panel to display the first image based on the second source voltage of the pixel unit.

12. A display driver chip DDIC, characterized in that, The DDIC is configured to perform the display control method according to any one of claims 1 to 10.

13. A display screen, characterized by The display screen comprises a display panel and the display driving chip DDIC as claimed in claim 12, wherein the display panel is used for displaying the image sent by the DDIC.

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