Display device

Abstract

The invention discloses a display device, and belongs to the technical field of display, the display device comprises a display panel, a backlight module and a control module, the backlight module is provided with a backlight driving circuit and a plurality of backlight partitions, and a light emitting unit in each backlight partition corresponds to light emitting chips of at least two different color channels. The control module determines the average image brightness APL of each color channel according to the target image backlight data, calculates a power constraint mean value in combination with a preset power ratio, calculates a current constraint mean value based on a preset backlight current limit value of each color channel, the current backlight current and the corresponding APL, and outputs the current constraint mean value. And selecting the power constraint mean value and the maximum value in the current constraint mean values to determine a target APL, and matching preset mapping data to obtain target backlight current of each color channel, so as to control the display panel to image and drive the corresponding light-emitting chip to emit light. According to the scheme, peak brightness improvement in a color scene can be realized in a hardware power and current constraint range.

Description

Technical Field

[0001] This invention relates to the field of display device technology, and more specifically to a display device. Background Technology

[0002] With the rapid popularization of high-definition display technology, consumers' demands for color performance and brightness gradation continue to rise. In high-end backlight control solutions, RGB MiniLEDs (Red Green Blue MiniLight Emitting Diodes) have become the mainstream technology due to their advantages such as independent three-color driving, high color gamut, and precise local dimming. Combined with peak enhancement technology, they can effectively break through the brightness bottleneck of traditional displays, further optimizing the visual effect of the image.

[0003] However, related technologies typically use only the overall power limit as a single constraint, without fully considering the current distribution differences of the RGB three channels and the rated current limit of the devices, making it difficult to maximize the peak color brightness within the hardware safety limits. Summary of the Invention

[0004] This application discloses a display device that can improve peak brightness in color scenes within the constraints of hardware power and current.

[0005] A first aspect of this application discloses a display device, the display device comprising: Display panel; A backlight module, the backlight module including a backlight driving circuit and a plurality of backlight zones, each backlight zone including at least one light-emitting unit, each light-emitting unit including at least two light-emitting chips, the at least two light-emitting chips corresponding one-to-one with at least two color channels, the backlight driving circuit being electrically connected to the plurality of backlight zones, the backlight driving circuit being configured to drive each light-emitting chip in the at least one light-emitting unit included in each backlight zone to emit light respectively; The control module is connected to the display panel and the backlight driving circuit respectively; The control module is configured as follows: Based on the backlight data of the target image, determine the average image brightness (APL) of each of the at least two color channels; The power constraint mean is calculated based on the preset power ratio and the APL of each color channel. The preset power ratio is used to characterize the proportion of the backlight power of each color channel in the preset backlight power when the display panel presents a preset image. Based on the preset backlight current limit of each color channel, the current backlight current of each color channel, and the APL of each color channel, the average current constraint of each color channel is calculated. The preset backlight current limit of each color channel corresponds to the maximum driving current allowed by the light-emitting chip of each color channel. The target APL is determined based on the average power constraint and the average current constraint of each color channel; Based on the target APL and the preset mapping data, the target backlight current corresponding to each color channel is determined. The preset mapping data includes data characterizing the correspondence between the APL and the backlight current of each color channel. The display panel is controlled to display the target image, and according to the target backlight current, the backlight driving circuit drives each light-emitting chip in at least one light-emitting unit included in each backlight zone to emit light.

[0006] In this solution, the display device includes a display panel, a backlight module, and a control module. The backlight module includes a backlight driving circuit, multiple backlight zones, and light-emitting chips corresponding to at least two color channels. The control module is connected to both the display panel and the backlight driving circuit. The control module determines the average image brightness (APL) of each color channel based on the target image backlight data. It calculates the average power constraint based on a preset power ratio and the APL of each color channel. It also calculates the average current constraint for each color channel based on preset backlight current limits, the current backlight current, and the APL. Finally, it determines the target APL based on the average power constraint and the average current constraint for each color channel, and combines this with preset mapping data to obtain the target backlight current corresponding to each color channel. This, in turn, controls the display panel display and the driving of each light-emitting chip. It is understandable that, compared to existing color peak brightness technologies that only use total backlight power as a constraint and do not consider single-channel current limitations, this application simultaneously introduces the average power constraint and the average independent current constraint for each color channel to jointly determine the target APL. While achieving color peak brightness enhancement based on the preset mapping relationship between APL and backlight current, the maximum drive current limit for each color channel is incorporated into the overall control logic. This approach avoids the overcurrent risk that may occur in a single color channel due to sufficient power margin but current reaching the hardware limit, thus improving display performance while keeping the current within the hardware safety limits.

[0007] As an optional implementation, in the first aspect of this application embodiment, the step of basing the power constraint average and the current constraint average of each color channel on the power constraint average is specifically configured as follows: The maximum value between the average power constraint and the average current constraint of each color channel is determined as the target APL.

[0008] In this scheme, when the display device's control module determines the target APL based on the average power constraint and the average current constraint of each color channel, it is specifically configured to use the maximum value between the average power constraint and the average current constraint of each color channel as the target APL. This means that by using the maximum value between the average power constraint and the average current constraint of each color channel as the target APL, both the overall backlight power constraint and the single-channel current constraint can be simultaneously considered. Since a larger APL in the preset mapping data corresponds to a smaller backlight current, using the maximum value as the target APL can effectively reduce the backlight drive current, thereby ensuring that the final output target backlight current does not exceed the preset backlight power limit or the hardware current limit of each color channel. This achieves brightness improvement while ensuring that the backlight system operates within a safe and reliable operating range.

[0009] As an optional implementation, in the first aspect of this application embodiment, the step of calculating the average current constraint value of each color channel based on the preset backlight current limit of each color channel, the current backlight current of each color channel, and the APL of each color channel is specifically configured as follows: The ratio of the current backlight current of each color channel to the preset backlight current limit of the corresponding color channel is determined as the gain limit of each color channel. The product of the APL of each color channel and the gain limit of the corresponding color channel is determined as the average current constraint value of each color channel.

[0010] In this scheme, when the control module calculates the average current constraint value for each color channel, it first determines the gain limit of the corresponding color channel based on the ratio of the current backlight current to the preset backlight current limit. Then, it multiplies the average current constraint value (APL) of each color channel with the corresponding gain limit to obtain the average current constraint value for each color channel. This calculation method quantifies the available current margin of each color channel by using the ratio of the preset backlight current limit to the current backlight current, forming a gain limit that matches the hardware capabilities. Combined with the APL of each color channel, the average current constraint value is obtained, directly transforming the upper limit current constraint into an APL constraint that can be used in the calculation. Compared with algorithms that do not introduce single-channel current limits, this method accurately reflects the actual current margin of each color channel, avoiding hardware risks caused by current exceeding limits. It ensures that the determination of the subsequent target APL simultaneously aligns with both power and current constraints, improving the stability, safety, and practicality of backlight control.

[0011] As an optional implementation, in the first aspect of this application embodiment, the step of calculating the power constraint mean based on the preset power ratio and the APL of each color channel is specifically configured as follows: The proportion of the backlight power of each color channel in the preset backlight power is used as the weighting coefficient of the corresponding channel. The APL of each color channel is then weighted and averaged to obtain the power constraint mean.

[0012] In this scheme, when the control module calculates the power constraint mean, it uses the proportion of each color channel's backlight power in the preset backlight power as a weighting coefficient to perform a weighted average of the APL of each color channel, thus obtaining the power constraint mean. This method, by weighting the APL of each color channel based on the weighting coefficient, accurately reflects the overall brightness level under the preset power proportion constraint, ensuring a strict match between the power constraint mean and the limit of the total backlight power. This guarantees that the subsequently obtained target backlight current remains within the preset backlight power range, effectively preventing the total backlight power from exceeding the limit while improving the peak brightness of colors, thereby enhancing the stability and reliability of backlight control.

[0013] As an optional implementation, in the first aspect of the embodiments of this application, the preset image is a full white field image.

[0014] In this scheme, the preset image is specifically a full-white image. The proportion of backlight power of each color channel in the preset backlight power under the full-white image is used as the weighting coefficient for calculating the power constraint mean in a weighted average calculation. It can be understood that setting the preset image as a full-white image ensures a unified, standardized, and easily implemented benchmark for determining the weighting coefficients, guaranteeing the consistency and accuracy of the power constraint mean calculation. Compared to using other non-standard images, a full-white image better reflects the conventional backlight power calibration conditions of display devices, allowing the weighting coefficients to more realistically reflect the power distribution relationship of each color channel, thereby further improving the accuracy and reliability of power constraint control. This ensures that the backlight control algorithm stably adapts to actual hardware operating scenarios.

[0015] As an optional implementation, in a first aspect of this application embodiment, the backlight data includes partition backlight data for each of the backlight zones. The control of the display panel to present the target image, and the driving of each light-emitting chip in at least one light-emitting unit included in each backlight zone to emit light via the backlight driving circuit according to the target backlight current, is specifically configured as follows: Based on the target backlight current corresponding to the target color channel and the partition backlight data of each of the backlight partitions, the partition backlight current corresponding to each of the backlight partitions is determined, wherein the target color channel is any one of the at least two color channels; The backlight driving circuit drives the target light-emitting chip of each light-emitting unit in each backlight zone to emit light based on the partition backlight current corresponding to each backlight zone, wherein the target light-emitting chip corresponds to the target color channel.

[0016] In this solution, the backlight module corresponds to multiple backlight zones, and the backlight data includes the zone-specific backlight data for each zone. The control module determines the corresponding zone backlight current based on the target backlight current of the target color channel and the zone-specific backlight data of each zone. Then, through the backlight driving circuit, it drives the target light-emitting chip corresponding to the target color channel in each zone to emit light according to the zone backlight current. In essence, this solution achieves zone-level current driving based on the target backlight current and zone backlight data, enabling fine-grained independent control of each backlight zone while meeting overall power and current constraints. Compared to a unified overall driving approach, this further improves the display effect of peak color brightness while ensuring that the light-emitting chip of each zone and each color channel operates within a safe current range. This enhances the accuracy, uniformity, and hardware safety of backlight control, making it more suitable for display scenarios with independent light control for multiple zones and multiple color channels.

[0017] As an optional implementation, in a first aspect of the embodiments of this application, the at least two color channels include a red channel, a green channel, and a blue channel; The preset mapping data includes a first preset mapping data, a second preset mapping data, and a third preset mapping data. The first preset mapping data includes data representing the correspondence between the APL of the red channel and the backlight current corresponding to the red channel. The second preset mapping data includes data representing the correspondence between the APL of the green channel and the backlight current corresponding to the green channel. The third preset mapping data includes data representing the correspondence between the APL of the blue channel and the backlight current corresponding to the blue channel.

[0018] In this scheme, the at least two color channels specifically include a red channel, a green channel, and a blue channel. The preset mapping data is divided into a first preset mapping data, a second preset mapping data, and a third preset mapping data, which are used to characterize the correspondence between the APL and the corresponding backlight current for each of the red, green, and blue channels, respectively. It can be understood that by setting independent preset mapping data for the red, green, and blue color channels, the relationship between the APL and backlight current for each color channel can be individually calibrated. Compared to existing technologies that use a unified mapping relationship, this can more accurately match the photoelectric characteristics and driving characteristics of different color light-emitting chips, improve the accuracy of backlight current calculation for each channel, thereby improving the precision of color peak brightness control and the realism of displayed colors. Simultaneously, it provides reliable data support for subsequent separate control of power constraints and current constraints, enhancing the adaptability and reliability of the algorithm.

[0019] As an optional implementation, in the first aspect of this application embodiment, the step of determining the target backlight current corresponding to each color channel based on the target APL and preset mapping data is specifically configured as follows: Based on the target mapping data, determine the backlight current corresponding to the target APL, and use the backlight current corresponding to the target APL as the target backlight current corresponding to the target color channel; The target mapping data represents the correspondence between the APL of the target color channel and the backlight current corresponding to the target color channel, wherein the target color channel is any one of the at least two color channels.

[0020] In this scheme, when the control module determines the target backlight current for each color channel based on the target APL and preset mapping data, it specifically looks up the backlight current corresponding to the target APL according to the target mapping data and uses it as the target backlight current for the target color channel. The target mapping data characterizes the correspondence between the APL of the target color channel and its corresponding backlight current, and the target color channel can be any one of at least two color channels. This configuration method uses target mapping data corresponding to the target color channel to directly convert the target APL into the corresponding target backlight current, ensuring that the backlight current for each color channel is independently determined based on a unified target APL and a specific mapping relationship, achieving precise matching of the driving current for each channel. Compared with a method using a universal mapping relationship, this effectively improves the accuracy and consistency of backlight current calculation, making color peak brightness control more closely match the hardware characteristics of each channel, while ensuring that power constraints and current constraints can be reliably executed in each channel, improving the stability of backlight control and display effect.

[0021] As an optional implementation, in a first aspect of the embodiments of this application, the control module is further configured to: Select multiple preset APLs; For each preset APL, determine the backlight current corresponding to the target color channel under the preset APL; The target mapping data is obtained based on the plurality of preset APLs and the backlight current corresponding to the target color channel under each preset APL.

[0022] In this scheme, target mapping data is used to characterize the correspondence between the APL (Average Power Probability) of the target color channel and the corresponding backlight current. The target color channel can be any one of at least two color channels. The control module selects multiple preset APLs, determines the backlight current corresponding to the target color channel under each preset APL, and then obtains target mapping data based on multiple sets of preset APLs and corresponding backlight currents. It can be understood that this method constructs target mapping data through multiple sets of preset APLs and corresponding backlight currents, accurately establishing the correspondence between the APL of the target color channel and the backlight current, providing a reliable basis for the subsequent determination of the target backlight current. Compared with directly using a fixed mapping relationship, this method makes the mapping data more closely match the actual photoelectric characteristics of the target color channel, significantly improving the accuracy and adaptability of backlight current calculation, thereby enhancing the precision and stability of color peak brightness control.

[0023] As an optional implementation, in a first aspect of this application, the step of determining the backlight current corresponding to the target color channel under the preset APL for each preset APL is specifically configured as follows: The control panel displays the test image. The test image includes a first image region located at the center and a second image region surrounding the first image region. The grayscale value of the first image region is 255, and the grayscale value of the second image region is 0. The area ratio of the first image region in the test image is the preset APL corresponding to the test image. When the test image is displayed on the display panel, the partition current of the target backlight partition in the target color channel is obtained, and the partition current is used as the backlight current of the target color channel under the preset APL corresponding to the test image. The target backlight partition is the backlight partition that corresponds to the first image area among the plurality of backlight partitions.

[0024] In this scheme, when the control module determines the backlight current corresponding to the target color channel under each preset APL, it controls the display panel to display a test image. This image consists of a first image region with a central grayscale value of 255 and a second image region with an outer grayscale value of 0. The area ratio of the first image region corresponds to the preset APL. When displaying the test image, the partition current of the target backlight partition corresponding to the first image region in the target color channel is collected and used as the backlight current corresponding to the target color channel under that preset APL. It can be understood that this method accurately simulates the actual display scenario of different preset APLs through a test image with a bright center and a completely black periphery. It can eliminate interference from the peripheral area and only collect the real partition current of the target backlight partition, making the measured APL and backlight current correspondence more accurate and reliable. Compared with the traditional overall brightness testing method, it can effectively reduce the influence of ambient light and non-target partitions on the measurement results, improve the accuracy of target mapping data, provide a more realistic and stable data foundation for subsequent color peak brightness control, and thus improve the accuracy of backlight control and hardware matching. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic structural diagram of a display device provided in an embodiment of this application; Figure 2 A schematic structural diagram of a backlight module provided in an embodiment of this application; Figure 3 A schematic flowchart of a backlight control method provided in an embodiment of this application; Figure 4 A schematic diagram illustrating the relationship between a preset APL value and the partition current is provided in an embodiment of this application. Figure 5 A schematic flowchart of another backlight control method provided in an embodiment of this application; Figure 6 A schematic flowchart of another backlight control method provided in an embodiment of this application; Figure 7 A schematic diagram of a test image provided in an embodiment of this application; Figure 8 This is a schematic structural diagram of another display device provided in an embodiment of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0029] The terms “comprising” and “having”, and any variations thereof, used in the embodiments of this application are intended to cover but not exclude inclusion. For example, a product or device that includes a series of components is not necessarily limited to all the components that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such products or devices.

[0030] The term "module" as used in the embodiments of this application refers to any known or subsequently developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code capable of performing the functions associated with that element.

[0031] With the rapid popularization of high-definition display technology, display products are constantly upgrading in terms of image quality, color, and dynamic range. Consumers' demands for color performance, brightness levels, and visual comfort are continuously increasing. In the field of high-end display backlighting, RGB MiniLED (Red Green Blue Mini Light Emitting Diode) backlighting solutions, with their advantages of independent driving of three-color chips, high color gamut coverage, and fine-grained local dimming, have gradually become the mainstream backlighting technology for high-end TVs, monitors, and automotive displays. This type of backlight structure, combined with peaking technology, can achieve local brightness enhancement in high-brightness areas of the screen, effectively breaking through the brightness limits of traditional backlighting solutions and significantly improving image contrast and visual impact.

[0032] However, existing backlight control solutions related to peak brightness enhancement typically use the total power of the entire system as the sole constraint for brightness improvement. They fail to fully consider the independent driving characteristics of the RGB three channels when adjusting peak brightness, ignoring the inherent differences in luminous efficiency, rated operating current, and safe operating range of the red, green, and blue chips. Furthermore, they do not provide fine-grained constraints on the upper limit of single-channel current. This type of control can easily lead to the current of a single-color channel approaching or exceeding the device's safety limits, posing a hardware reliability risk. Simultaneously, it cannot reasonably allocate and optimize the three-color current while meeting both the constraints of overall power and device safety, making it difficult to maximize the peak brightness of the color image within hardware safety limits.

[0033] To improve peak color brightness within hardware safety limits, this application provides a display device. Compared to existing peak color brightness technologies that only use total backlight power as a constraint and do not consider single-channel current limitations, this application simultaneously introduces the average power constraint and the average independent current constraint for each color channel to jointly determine the target APL. While improving peak color brightness based on a preset mapping relationship between APL and backlight current, the maximum drive current limit for each color channel is incorporated into the overall control logic. This approach avoids the overcurrent risk that may occur in a single color channel due to sufficient power margin but current reaching the hardware limit, thus improving display performance while keeping the current within hardware safety limits.

[0034] The display device provided in this application will be described in detail below with reference to the accompanying drawings and embodiments, so as to make the purpose and technical solution of this application clearer and more intuitive. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0035] It is understood that the display devices provided in the embodiments of this application refer to devices with screen display and data processing capabilities, including but not limited to liquid crystal display devices, liquid crystal televisions, liquid crystal monitors, mobile phones, tablet computers, laptops, vehicle-mounted display devices, smart screens, advertising machines, digital signage, monitoring displays, and head-mounted display devices, etc., without specific limitations.

[0036] To provide a clear understanding of the display device provided in the embodiments of this application, a schematic structural diagram of the display device is provided in the embodiments of this application. Please refer to... Figure 1 The display device includes a display panel 10, a backlight module 20, and a control module 30.

[0037] The backlight module 20 includes a backlight driving circuit 22 and multiple backlight zones 23. Each backlight zone 23 has at least one light-emitting unit, and each light-emitting unit includes at least two light-emitting chips, with each light-emitting chip corresponding to at least two color channels. The backlight driving circuit 22 is electrically connected to the multiple backlight zones 23 and is used to drive each light-emitting chip in the light-emitting unit of each backlight zone 23 to emit light. The control module 30 is connected to both the display panel 10 and the backlight driving circuit.

[0038] In this embodiment, the shape and size of the display panel 10 are adapted to the display device. When applied to scenarios such as televisions and mobile terminals, a rectangular structure can be adopted, including the top and bottom sides, and the left and right sides arranged opposite each other, with each side connected end to end in sequence. The display panel 10 is a transmissive non-self-emissive panel, which can modulate the light transmittance. It has multiple pixel units arranged in an array inside, and each pixel unit can independently control the transmittance and color of the incident light from the backlight module 20, so that the light transmitted by the entire pixel unit is combined to form a display image. In some examples, the display panel 10 can be a liquid crystal display panel, which can include a liquid crystal layer and a filter layer. The liquid crystal layer is composed of liquid crystal molecules between two conductive glass sheets. By applying an electric field through electrodes, the alignment direction of the liquid crystal molecules can be changed, thereby adjusting the transmittance of the light emitted from the backlight to achieve image display. The filter layer is disposed above the liquid crystal layer and is used to filter the white light from the backlight, allowing light of a specific wavelength to pass through, thereby achieving color image display.

[0039] It is understood that the above description of the display panel is merely an example, and the display panel may also have other structures; for example, the display panel may not include a filter layer. The structure of the display panel in this application embodiment is not specifically limited.

[0040] In this embodiment, the backlight module 20 is typically located at the bottom of the display device, and its shape and size match the display panel 10. When applied to products such as televisions or mobile terminals, a rectangular structure can be adopted. The backlight module 20 includes a backlight driving circuit and multiple light-emitting units. Each light-emitting unit may contain at least two light-emitting chips, each chip being used to emit light of different wavelengths. The backlight driving circuit is connected to each light-emitting unit and is used to independently drive each light-emitting chip therein to emit light.

[0041] In some embodiments, the light-emitting unit may be provided with three light-emitting chips corresponding to the R, G, and B color channels respectively, namely a red light-emitting chip, a green light-emitting chip, and a blue light-emitting chip, and the backlight driving circuit may drive and control these three chips respectively.

[0042] For example, to better understand the backlight module provided in the embodiments of this application, a schematic structural diagram of a backlight module is provided in the embodiments of this application, such as... Figure 2In the example of the backlight module structure shown, the backlight module 20 includes a backplate 21, a backlight driving circuit 22, and multiple light-emitting units 26.

[0043] In this embodiment, the backplate 21 is located at the bottom of the backlight module, serving a supporting and load-bearing function, and can adopt a rectangular structure adapted to the display device. For a direct-lit backlight module, the backlight driving circuit 22 is disposed on the backplate 21 and is used to provide driving signals to the light-emitting units 26. The light-emitting units 26 are disposed on the backlight driving circuit 22 and electrically connected. Each light-emitting unit 26 may contain a light-emitting chip with three color channels, and the backlight driving circuit 22 can output driving signals to independently drive each chip to work.

[0044] In some embodiments, such as Figure 2 As shown, the backlight module 20 may also be provided with a diffuser plate 24, which is located on the light-emitting side of the light-emitting unit 26. It is used to scatter light to improve the uniformity of light emission, while maintaining a distance from the light-emitting unit 26 to achieve sufficient light mixing. For example, a quantum dot diffuser plate can be used.

[0045] In some embodiments, such as Figure 2 As shown, the backlight module 20 may also have an optical film 25 disposed above the diffuser plate 24. The optical film 25 may be at least one of a phosphor film, a quantum film, a prism sheet, or a brightness enhancement film. Through the cooperation of the diffuser plate 24 and the optical film 25, light utilization efficiency can be improved, light emission uniformity optimized, brightness and color performance enhanced, and the overall brightness distribution of the display panel more uniform. It should be noted that the above structure is merely an example, and the backlight module may also adopt other structural forms; this application does not specifically limit its application.

[0046] In this embodiment, the control module 30 is connected to the display panel 10 and the backlight driving circuit 22, respectively.

[0047] The control module 30 is used to perform operations such as format conversion, data processing, image rendering and protocol conversion on the input target image, generate intermediate display data and further process it, and output the final display data to the display panel 10.

[0048] In this embodiment, the control module 30 processes the target image to obtain backlight data, and calculates the average image brightness (APL) of each of the three color channels (R, G, and B). Then, it performs a weighted average of the average image brightness of each channel according to a preset power ratio to obtain the target APL. The preset power ratio characterizes the backlight power corresponding to each color channel when the display panel displays a preset image. Subsequently, the control module 30 determines the target backlight current corresponding to each color channel based on the target APL and preset mapping data, and sends the current information to the backlight driving circuit 22 to drive each light-emitting chip in the light-emitting unit to emit light. The preset mapping data characterizes the correspondence between the APL of each color channel and the backlight current.

[0049] In addition, the backlight area of ​​the backlight module can be divided into multiple backlight zones 23. Each backlight zone can contain one or more light-emitting units. For example, the light-emitting units of a backlight zone can be 1, 2, 4, etc. There is no specific limitation here, and it can be set according to the actual situation.

[0050] Each light-emitting unit has three light-emitting chips: R, G, and B. The control module can independently control the operation of each light-emitting unit according to the backlight zone, and drive the light-emitting chips of different color channels in each light-emitting unit.

[0051] The foregoing section has provided a schematic illustration of the structure of the display device. The following section describes the backlight control method provided in the embodiments of this application. For a clear understanding of the control method of the control module of this display device, please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a schematic flowchart of a backlight control method for a control module disclosed in an embodiment of this application. The flowchart includes at least the following steps.

[0052] Step S101: The control module determines the average image brightness (APL) of each color channel in at least two color channels based on the backlight data of the target image.

[0053] In this embodiment, the target image is the image to be displayed currently input to the display device control module. When at least two color channels are R, G, and B channels, the image information of the target image can be represented by the components of the three color channels R, G, and B. The backlight data of the target image includes its brightness information, which can be used to adjust the backlight brightness of the backlight module. When the backlight module is divided into multiple backlight zones, the backlight data can include the backlight brightness values ​​required for each backlight zone.

[0054] In this embodiment, the average image brightness (APL) of a color channel is the average backlight brightness of all pixels in the target image in that channel. It reflects the average brightness level of the target image in that color channel and can be specifically divided into R channel average image brightness, G channel average image brightness, and B channel average image brightness. To determine the average image brightness of a target color channel, the target image can first undergo color dimming or zone dimming processing to obtain zone backlight data containing data for each backlight zone in each color channel. Then, the backlight data of multiple backlight zones in the target color channel are averaged to obtain the average image brightness of that channel.

[0055] For example, by performing color dimming processing on the target image to obtain the backlight data of each backlight zone, the average image brightness of the three color channels R, G, and B can be calculated respectively.

[0056] For example, the average image brightness of the three color channels R, G, and B can be calculated using the following formula.

[0057]

[0058] Where APL_R represents the average image brightness of the R color channel, APL_G represents the reference APL of the G color channel, and APL_B represents the reference APL of the B color channel. Let BL_G(i,j) represent the backlight data of the (i,j)th backlight zone on the R color channel, BL_B(i,j) represent the backlight data of the (i,j)th backlight zone on the G color channel, M and N represent the number of rows and columns respectively, and M×N represents the number of backlight zones.

[0059] Step S102: The control module calculates the power constraint mean value based on the preset power ratio and the APL of each color channel.

[0060] Among them, the preset power ratio is used to characterize the proportion of the backlight power of each color channel in the preset backlight power when the display panel presents the preset image; In some embodiments, the preset image can be a full white field image. In this case, the preset power ratio represents the proportion of the backlight output power corresponding to each color channel to the total preset backlight power when the display panel presents a full white field image. Specifically, the preset power ratio can include the backlight power of the R color channel, the backlight power of the G color channel, and the backlight power of the B color channel. Specifically, the backlight power of the R color channel represents the proportion of the backlight power corresponding to the red channel light-emitting chip 261 to the total preset backlight power when the display panel presents a full white field image; the backlight power of the G color channel represents the proportion of the backlight power corresponding to the green channel light-emitting chip 262 to the total preset backlight power when the display panel presents a full white field image; and the backlight power of the B color channel represents the proportion of the backlight power corresponding to the blue channel light-emitting chip 263 to the total preset backlight power when the display panel presents a full white field image.

[0061] The total preset backlight power is equal to the sum of the backlight power of the R color channel, the backlight power of the G color channel, and the backlight power of the B color channel.

[0062] In some embodiments, after pre-determining the preset power ratio, i.e. the backlight power of the R color channel, the backlight power of the G color channel, and the backlight power of the B color channel, the stored preset power ratio is obtained after determining the approximate power average, and the power constraint average is determined based on the preset power ratio.

[0063] In this embodiment, the power constraint mean value is used to characterize the overall average image brightness value corresponding to the backlight power of each color channel of the display panel after being weighted by a preset ratio under the preset backlight power constraint. It is used to provide a power upper limit constraint benchmark for the subsequent determination of the target APL, and to ensure that the backlight current driven in the end does not exceed the preset backlight power range.

[0064] Step S103: The control module calculates the average current constraint value of each color channel based on the preset backlight current limit of each color channel, the current backlight current of each color channel, and the APL of each color channel.

[0065] Among them, the preset backlight current limit for each color channel corresponds to the maximum driving current allowed by the light-emitting chip of each color channel; In this embodiment, the preset backlight current limit refers to the maximum driving current that the light-emitting chip of each color channel is allowed to apply under rated operating conditions and within the safe operating range. It is the upper limit of the hardware current for the backlight drive of the corresponding color channel, and is used to prevent damage, overheating or lifespan reduction of the light-emitting chip due to excessive current.

[0066] Optionally, there are many ways to obtain the preset backlight current limit, such as pre-storage, factory calibration, dynamic configuration, and driver chip parameter reading. No specific restrictions are imposed here, and the appropriate method can be selected according to the actual situation.

[0067] Among them, the pre-stored method refers to the preset backlight current limit being the upper limit of the safe driving current corresponding to each color channel light-emitting chip obtained through experimental calibration before leaving the factory, which is pre-stored in the storage module of the display device, and the control module directly reads it during operation; the factory calibration method refers to the preset backlight current limit being determined by the production stage based on the electrical characteristics, reliability and lifespan test of the light-emitting chip, and is fixed as a hardware parameter in the control module; the dynamic configuration method refers to the preset backlight current limit being adaptively adjusted by the control module according to the current ambient temperature, working time, backlight brightness level and other operating status; the driver chip parameter reading method refers to the preset backlight current limit being the maximum output current supported by the backlight driver chip itself, which the control module obtains by reading the configuration register or hardware parameters of the backlight driver chip.

[0068] In this embodiment, the current backlight current refers to the actual driving current of the light-emitting chips of each color channel before the execution of this backlight control, which is used to reflect the current occupancy and remaining current margin of the corresponding color channel.

[0069] Optionally, there are many ways to obtain the backlight current, such as real-time sampling, drive feedback, control parameter back-calculation, and recording and reading, etc., and no specific restrictions are imposed here.

[0070] Among them, the real-time sampling method refers to collecting the actual driving current of each color channel through the current sampling circuit, and transmitting it to the control module after signal processing; the drive feedback method refers to the backlight driving circuit feeding back the real-time output current signal, and the control module determining the current backlight current based on the feedback signal; the control parameter back-calculation method refers to the control module calculating the current backlight current based on the backlight control command output in the previous cycle and a preset mapping relationship; and the record reading method refers to temporarily storing the target backlight current calculated in the previous frame and using it as the current backlight current in the current process.

[0071] In this embodiment, the average current constraint is a constraint parameter calculated based on the preset backlight current limit of each color channel, the current backlight current, and the average image brightness (APL) of the corresponding color channel. It is used to provide a single-channel current safety constraint benchmark for determining the target APL, so that the final determined target backlight current meets the requirements for improving color peak brightness without exceeding the hardware current limit of each color channel, thereby ensuring the safety, stability, and reliability of the backlight driver.

[0072] Step S104: The control module determines the target APL based on the average power constraint value and the average current constraint value of each color channel.

[0073] In some embodiments, the target APL can be determined based on the maximum value of the power constraint mean and the current constraint mean of each color channel.

[0074] It is understandable that by determining the maximum value between the average power constraint and the average current constraint of each color channel as the target APL, the dual constraints of overall backlight power constraint and single-channel current constraint can be simultaneously considered. Since the preset mapping data exhibits a monotonically decreasing characteristic, using the maximum value as the target APL can effectively reduce the backlight drive current, thereby ensuring that the final output target backlight current does not exceed the preset backlight power limit or the hardware current limit of each color channel. This achieves brightness improvement while ensuring that the backlight system operates within a safe and reliable operating range.

[0075] In other embodiments, the target APL can be determined by selecting a value that is larger than the average power constraint value for each color channel. It is understood that, in this case, depending on the number of color channels, there can be multiple values ​​that are larger than the average power constraint value. To ensure the presented color effect, the maximum value among these multiple values ​​that are larger than the average power constraint value can be selected as the target APL.

[0076] It is understandable that by selecting a target APL (Average Power Limit) that is greater than the average power constraint among the average current constraints of each color channel, the current safety constraints of each color channel can be prioritized, avoiding hardware damage due to overcurrent. Due to the characteristics of the preset mapping function, the larger the APL, the smaller the corresponding backlight current. Therefore, using a larger target APL can keep the backlight drive current within a safe range while also taking into account power constraint requirements, thus improving the reliability and stability of backlight control.

[0077] Step S105: The control module determines the target backlight current corresponding to each color channel based on the target APL and the preset mapping data. The preset mapping data includes data that characterizes the correspondence between the APL and the backlight current of each color channel.

[0078] Preset mapping data is used to characterize the correspondence between the APL (Advanced Power Proportion) of different color channels and the backlight current. The APL is a preset APL, and the corresponding backlight current is a preset backlight current. Since different preset APLs correspond to different display brightness requirements, the backlight module needs to adjust the output current accordingly. Therefore, a corresponding preset backlight current can be configured for each preset APL.

[0079] It is understood that the preset backlight current can be set according to the display device model, performance parameters and actual needs, and this application does not make any specific limitations on this.

[0080] In this embodiment, the light-emitting unit may include three independently driven light-emitting chips: R, G, and B. Correspondingly, the preset mapping data can be divided into first preset mapping data, second preset mapping data, and third preset mapping data, corresponding to the three color channels R, G, and B, respectively. Specifically, the first preset mapping data represents the correspondence between the preset APL and the preset backlight current of the R channel; the second preset mapping data represents the correspondence between the preset APL and the preset backlight current of the G channel; and the third preset mapping data represents the correspondence between the preset APL and the preset backlight current of the B channel.

[0081] For example, the preset mapping data can be implemented using the relationship curve between the preset APL and the preset backlight current. Each color channel can correspond to an independent relationship curve, namely the peaking curve.

[0082] This embodiment establishes pre-defined mapping data between preset APL and corresponding preset backlight current for each color channel (R, G, B). Based on this mapping data, the backlight driving data for each channel can be determined separately, thereby improving backlight control accuracy and optimizing display effects.

[0083] In some embodiments, when the backlight module is driven by backlight zones, the backlight driving data of each light-emitting unit in the same backlight zone remains consistent. Therefore, the preset mapping data can be used to characterize the correspondence between the preset APL and the zone backlight current.

[0084] Specifically, the preset mapping data is divided into three groups, corresponding to the R, G, and B color channels respectively: the first preset mapping data represents the correspondence between the preset APL and the preset partition backlight current of the R channel, the second preset mapping data represents the correspondence between the preset APL and the preset partition backlight current of the G channel, and the third preset mapping data represents the correspondence between the preset APL and the preset partition backlight current of the B channel.

[0085] Since different preset APLs correspond to different display brightness requirements, the backlight current of each backlight zone needs to be adjusted accordingly. Therefore, for each preset APL, a corresponding preset backlight current can be set for a single backlight zone. This preset backlight current can select the current value of a specified backlight zone as a reference to uniformly calibrate the current parameters of other backlight zones. Its specific value can be set according to the display device model, performance parameters, and actual needs. This application does not impose specific limitations on this.

[0086] In this embodiment, preset mapping data between APL and corresponding partition current is established for each color channel (R, G, B). When adjusting the backlight brightness later, the corresponding backlight driving data can be determined for each backlight partition based on the preset mapping data specific to each channel, thereby further improving the backlight control accuracy and optimizing the overall display effect.

[0087] For example, the preset mapping data can be presented through a preset APL and partition current relationship curve, such as... Figure 4 As shown, R1, G2, and B3 are three curves representing the mapping relationship between the three channels R, G, and B, respectively. The values ​​of the current in each channel zone as a function of APL differ, but the overall trend remains consistent.

[0088] In this embodiment, the target backlight current corresponding to the color channel refers to the target operating current that the light-emitting chip of that channel needs to be adjusted to under the target APL corresponding to the current target image.

[0089] Taking any target color channel as an example, when determining its corresponding target backlight current, the target mapping data of the channel can be used to find the backlight current corresponding to the target APL, and this value can be directly used as the target backlight current of the target color channel.

[0090] like Figure 4 As shown, if the target color channel is the R channel, the corresponding partition current of the target APL can be found through curve R1 and used as the target backlight current of the R channel; if the target color channel is the G channel, the corresponding partition current can be found through curve G2 and used as the target backlight current of the G channel. The same method is used to determine the target backlight current of the B channel.

[0091] Step S106: The control module controls the display panel to present the target image, and drives each light-emitting chip in at least one light-emitting unit included in each backlight zone to emit light according to the target backlight current through the backlight driving circuit.

[0092] For example, while controlling the display panel to display the target image, the backlight driving circuit can drive the light-emitting chip of the corresponding color channel in each light-emitting unit to emit light according to the target backlight current corresponding to each color channel.

[0093] The following describes the process of driving the light-emitting chip based on the corresponding target backlight current, taking any one of the R, G, or B target color channels as an example. In this embodiment, the target mapping data is used to characterize the correspondence between the preset APL value and the target color channel partition current, where the partition current refers to the target backlight current required by the specified backlight partition in the target color channel under the corresponding preset APL value.

[0094] The specific driving process is as follows: After determining the target backlight current corresponding to each of the R, G, and B channels, the target backlight current of the R channel is combined with the backlight data of each zone to obtain the R channel backlight current 1 of each zone, which drives the light-emitting chip 261 of the red channel of the light-emitting unit in each zone; similarly, the target backlight current of the G channel is combined with the backlight data of each zone to obtain the G channel backlight current 2 of each zone, which drives the light-emitting chip 262 of the corresponding green channel; the target backlight current of the B channel is combined with the backlight data of each zone to obtain the B channel backlight current 3 of each zone, which drives the light-emitting chip 263 of the corresponding blue channel.

[0095] This solution leverages target backlight current and zoned backlight data to achieve refined current driving at the zone level. While meeting overall power constraints and single-channel current constraints, it effectively improves peak color brightness display performance. Compared to globally unified driving, this method enables independent and precise light control for each backlight zone and each color channel, ensuring that each light-emitting chip always operates within a safe current range. This significantly improves the accuracy of backlight control, screen brightness uniformity, and hardware operational safety, making it suitable for high-end display scenarios with multi-zone independent light control.

[0096] In some embodiments, to better understand the methods for obtaining the power constraint average and current constraint average of the present application embodiments, the present application embodiments provide a schematic flowchart of another backlight control method for a control module. Please refer to... Figure 5 The flowchart includes at least the following steps.

[0097] Step S201: The control module determines the average image brightness (APL) of each color channel in at least two color channels based on the backlight data of the target image.

[0098] In the embodiments, the description of step S201 can be referred to step S101, and will not be repeated in detail here.

[0099] Step S202: The control module uses the proportion of the backlight power of each color channel in the preset backlight power as the weight coefficient of the corresponding channel, and performs weighted averaging on the APL of each color channel to obtain the power constraint mean.

[0100] In this embodiment, the proportion of the backlight power of each color channel in the preset backlight power when displaying a full white field image is used as the weight coefficient of the corresponding color channel, and the average image brightness of the three color channels R, G, and B is weighted and averaged to obtain the target APL.

[0101] For example, when the preset image is a full white field image, the power output of the display device is at its maximum. Therefore, the average image brightness of the three color channels R, G, and B is processed using the full white field backlight power, and the driving data is determined based on the processed APL value. In this way, while avoiding the display device's backlight power from exceeding the maximum backlight power, the backlight brightness of the display device can be increased to a greater extent, thereby effectively improving the display effect of the color picture and enhancing the color dynamic range of the display device.

[0102] The following example illustrates the process of determining the power constraint mean, using the preset backlight power as the full white field backlight power.

[0103] For example, the power constraint mean can be calculated using the following formula:

[0104] Where APL' represents the power constraint mean; power_r represents the backlight power of the R color channel when the display panel presents a full white field image; APL_R represents the average image brightness of the R color channel; power_g represents the backlight power of the G color channel when the display panel presents a full white field image; APL_G represents the average image brightness of the G color channel; power_b represents the backlight power of the B color channel when the display panel presents a full white field image; APL_R represents the average image brightness of the B color channel; and power_w represents the total backlight power of the full white field, i.e., the preset backlight power.

[0105] For example, the total preset backlight power for a full white field can be calculated as follows.

[0106] power_w=power_r+power_g+power_b; Wherein, power_w represents the preset backlight power for full white field; power_r represents the backlight power of the R color channel when the display panel presents a full white field image; power_g represents the backlight power of the G color channel when the display panel presents a full white field image; and power_b represents the backlight power of the B color channel when the display panel presents a full white field image.

[0107] Step S203: The control module determines the gain limit of each color channel as the ratio of the current backlight current of each color channel to the preset backlight current limit of the corresponding color channel. For example, the gain limit can be calculated using the following formula.

[0108] R_gain = I_rnorm / I_rmax; G_gain = I_gnorm / I_gmax; B_gain = I_bnorm / I_bmax; The gain limit represents the reciprocal of the maximum current factor that can be increased for each color channel without exceeding the current safety threshold.

[0109] Where I_rmax is the preset backlight current limit for the red channel, I_gmax is the preset backlight current limit for the green channel, I_bmax is the preset backlight current limit for the blue channel, I_rnorm is the current current value for the red channel, I_gnorm is the current current value for the green channel, and I_bnorm is the current current value for the blue channel. Step S204: The control module determines the average current constraint value of each color channel by multiplying the APL of each color channel with the gain limit of the corresponding color channel.

[0110] For example, the average current constraint value of each color channel can be calculated using the following formula by combining the average image brightness APL_R of the red channel, the average image brightness APL_G of the green channel, and the average image brightness APL_B of the blue channel.

[0111] APLR_limit = (1 / R_gain) × APL_R; APLG_limit = (1 / G_gain) × APL_G; APLB_limit = (1 / B_gain) × APL_B; The current constraint mean is used to limit the minimum value of APL for each channel to prevent the current from exceeding the safe range due to excessive peak compensation.

[0112] Step S205: The control module determines the maximum value among the power constraint mean and the current constraint mean of each color channel as the target APL.

[0113] For example, the target APL can be obtained by referring to the following formula.

[0114] Target APL=max(APL`,APLR_limit,APLG_limit,APLB_limit); Since the preset mapping data in this scheme, namely the Peaking curve, is a monotonically decreasing function, taking the maximum value of APL is equivalent to taking the minimum value of the backlight drive current. Therefore, the target APL can simultaneously meet the power constraint and the current constraint of the R / G / B three channels, ensuring that the backlight drive operates within a safe power and current range.

[0115] Step S206: The control module determines the target backlight current corresponding to each color channel based on the target APL and the preset mapping data. The preset mapping data includes data representing the correspondence between the APL and the backlight current of each color channel. Step S207: The control module controls the display panel to present the target image, and drives each light-emitting chip in at least one light-emitting unit included in each backlight zone to emit light according to the target backlight current through the backlight driving circuit.

[0116] In the embodiments, the description of steps S206-S207 can be referred to steps S104-S106, and will not be elaborated here.

[0117] For example, taking at least two color channels as R, G, and B three-color channels, where power_r is 185W, power_g is 143W, power_b is 125W, and the corresponding power_w is 453W, the target APL value is calculated using the control method of this application embodiment for three monochrome display scenarios: pure red, pure green, and pure blue. Power and current limit verification is then performed to ensure that the backlight control process meets hardware safety constraints. The specific calculation and verification process is as follows: In a pure red field scenario, the original APL values ​​for each channel satisfy: APL_R=255, APL_G=0, APL_B=0. Following the calculation methods for the average power constraint and average current constraint provided in this application embodiment, APL`=53.55; APLR_limit=170; APLG_limit=0; APLB_limit=0; the maximum value is selected to determine the target APL value as 170. Based on the original APL_R=255 and the final target APL=170, the luminance gain is calculated to be 255 / 170=1.5 times.

[0118] The original power of channel R is 185W. After amplification by 1.5 times, the power of channel R is 185 × 1.5 = 277.5W. The total power is 277.5W, which is lower than the upper limit of 453W, thus meeting the power limit requirement. In addition, the current of channel R, after amplification by 1.5 times, just reaches the upper limit of channel current and does not exceed the limit requirement.

[0119] In summary, in a pure red field scenario, the maximum brightness gain is 1.5 times, which can simultaneously meet the R-channel current limit and the total power limit of the whole machine.

[0120] For example, in a pure green field scenario, the original APL values ​​for each channel satisfy: APL_G=255, APL_R=0, APL_B=0. Using the provided calculation methods for the average power constraint and the average current constraint, APL`≈81.6; APLR_limit=0; APLG_limit=127.5; APLB_limit=0 are obtained respectively. The maximum value is selected to determine the target APL value as 127.5. Based on the original APL_G=255 and the final APL=127.5, the luminance gain is calculated to be 255 / 127.5=2 times.

[0121] The original power of channel G is 143W. After amplification by 2x gain, the power of channel G is 143×2=286W, and the total power is 286W, which is lower than the total power limit of 453W, thus meeting the power limit requirement. In addition, the current of channel G, after amplification by 2x gain, just reaches the upper limit of channel current and does not exceed the limit requirement.

[0122] In summary, under pure green field conditions, the maximum brightness gain is 2 times, and the backlight control process is safe and compliant.

[0123] For example, in a pure blue field scenario, the original APL values ​​for each channel satisfy: APL_B=255, APL_R=0, APL_G=0. Using the provided calculation methods for the average power constraint and the average current constraint, APL`≈68.85; APLR_limit=0; APLG_limit=0; APLB_limit=127.5 are obtained. The maximum value is selected to determine the target APL value as 127.5. Based on the original APL_B=255 and the final APL=127.5, the luminance gain is calculated to be 255 / 127.5=2 times.

[0124] The original power of channel B is 125W. After being amplified by a factor of 2, the power of channel B is 125 × 2 = 250W, and the total power is 250W, which is lower than the total power limit of 453W, thus meeting the power limit requirement. In addition, the current of channel B, after being amplified by a factor of 2, just reaches the upper limit of the channel current and does not exceed the limit requirement.

[0125] In summary, under pure blue field scenarios, the maximum brightness gain is 2 times, which can simultaneously meet the single-channel current limit and the total power limit of the whole machine, and the stability and safety of backlight control meet the standards.

[0126] In some embodiments, to better understand the process of obtaining preset mapping data in the backlight control method of this application embodiment, the following exemplary description is provided: If the preset mapping data adopts the form of a relationship curve between a preset APL value and a preset backlight current, when obtaining the target mapping data corresponding to any target color channel, multiple preset APL values ​​are first selected. For each preset APL value, the preset backlight current of the target color channel under that value is set separately. Then, based on multiple sets of preset APL values ​​and corresponding preset backlight currents, the relationship curve between the two is fitted, which is the target mapping data.

[0127] In another embodiment, if the preset mapping data adopts the form of a relationship curve between preset APL values ​​and partition current, when obtaining the target mapping data of the target color channel, multiple preset APL values ​​are selected, and a corresponding partition current of the target color channel is set for each preset APL value. Then, the relationship curve between the preset APL values ​​and the partition current of the target color channel is generated by fitting multiple sets of data to obtain the target mapping data.

[0128] To better understand this method, embodiments of this application provide a flowchart illustrating the acquisition of target mapping data, such as... Figure 6 As shown, this flowchart includes at least the following steps: In step S301, the control module controls the display panel to present the test image. Different test images correspond to different preset APL values, and the different sizes of preset APL values ​​can be distinguished by setting test images with white windows of different areas. For example, as shown... Figure 7 As shown, the test image includes a central first image region 31 and an outer second image region 32. The first image region has a grayscale value of 255, representing a white window area, while the second image region has a grayscale value of 0, representing a black area. The area ratio of the white window region in the entire test image is positively correlated with the preset APL value; a larger ratio corresponds to a larger preset APL value, and a smaller ratio corresponds to a smaller preset APL value. Since different preset APL values ​​correspond to different required display brightness, in actual implementation, the display device displays the test image corresponding to a certain preset APL value. By adjusting the output current of the backlight module, the brightness of the display device is calibrated to the second preset brightness corresponding to that preset APL value.

[0129] Step S302: When the test image is displayed on the display panel, the control module obtains the partition current of the target backlight partition in the target color channel and uses the partition current as the backlight current of the target color channel under the preset APL corresponding to the test image.

[0130] In this embodiment, the backlight partition is designated as the backlight partition corresponding to the first image area in the test image. If the first image area is the center area of ​​the test image, the designated backlight partition is the center backlight partition among multiple backlight partitions. The partition current in the target color channel of this partition can represent the working current of the channel corresponding to the partition where the white image is located.

[0131] Step S303: The control module generates a curve showing the relationship between the preset APL value and the partition current of the target color channel based on multiple preset APL values ​​and the partition current of the target color channel under each preset APL.

[0132] In this embodiment, taking the R color channel as an example, the specific curve determination process is as follows: The display device sequentially displays a series of test images corresponding to different preset APL values. For each test image displayed, the backlight module output current is adjusted to make the display brightness reach the second preset brightness corresponding to the preset APL value. Then, the backlight current of the light-emitting chip 261 in the red channel within the central backlight partition is collected and used as the partition current of the R channel under the preset APL value. Based on multiple sets of preset APL values ​​and corresponding R channel partition currents, a relationship curve between the two can be generated. Figure 4 Curve R1 in the diagram.

[0133] Taking the G color channel as an example, the process is the same as that of the R channel: test images with different preset APL values ​​are displayed sequentially. After calibrating the display brightness, the backlight current of the green channel light-emitting chip 262 in the central backlight zone is collected as the zone current of the G channel under the corresponding preset APL value. Then, a relationship curve is generated by fitting multiple sets of data. Figure 4 The relationship curves for curves G2 and B in the curves are determined in the same way, and will not be elaborated on here.

[0134] For example, to understand the overall process of displaying images using the display device provided in this application embodiment, please refer to... Figure 8 , Figure 8 This is a schematic structural diagram of the physical modules of another display device provided in an embodiment of this application. The display device includes a system-on-chip (SoC) module 41, a timing controller (TCON) module 42, a backlight control (Bcon) module 43, a dimming module 44, and a display panel 10. The TCON module 42 further includes a local dimming submodule 421 and a peaking submodule 422.

[0135] To clearly understand the overall display process of the display device provided in the embodiments of this application, for example, firstly, the SoC module 41 receives and preprocesses the raw RGB image data to generate standardized image data.

[0136] That is, the system-on-a-chip of SoC module 41 receives raw RGB image data from the host computer, video decoding module or image sensor. The raw RGB image data is a pixel stream scanned line by line, which can use RGB888, RGB565 or other industry-standard display formats. No specific restrictions are made here. Each pixel contains independent red, green and blue three-channel luminance components.

[0137] The SoC module 41 can perform standardized preprocessing operations on the raw RGB image data, such as format unification and bit width expansion, color space conversion, noise reduction filtering, and preliminary gamma correction, without specific limitations.

[0138] Standardized image data output after standardized preprocessing refers to a set of pixel data with uniform bit width, standardized color space, no noise interference, and conforming to visual gamma characteristics; this data can be directly used for backlight zone brightness calculation to ensure processing consistency under different input sources.

[0139] Meanwhile, based on standardized image data, SoC module 41 calculates the sum, maximum and minimum values ​​of pixel brightness in the R / G / B three channels of the entire frame image, obtains the initial global average brightness APLorig, and generates brightness statistical auxiliary information containing the brightness distribution characteristics of each channel. Subsequently, SoC module 41 transmits the standardized image data and brightness statistical auxiliary information to TCON module 42 in accordance with the transmission protocol agreed upon by the display system.

[0140] In the TCON module 42, firstly, the local dimming module 44 performs local dimming processing to obtain the backlight data and average image brightness of each locality.

[0141] For example, firstly, the TCON module 42 divides the display panel 10 into an independent backlight zone array of M rows × N columns (M and N are both positive integers, and the specific values ​​can be adjusted according to the actual panel design, such as 32×32, 64×64, etc.) according to the hardware specifications of the display panel 10 (such as panel size and pixel density). Each backlight zone corresponds to an independent LED light-emitting unit group, and its brightness can be controlled independently. At the same time, the TCON module 42 establishes a one-to-one mapping relationship between each backlight zone and the corresponding image sub-region in the standardized image data. That is, each backlight zone is only responsible for illuminating its mapped image sub-region, ensuring that the backlight brightness and image content are accurately matched and avoiding cross-zone brightness interference.

[0142] Then, for each backlight partition (i,j) (where i represents the number of rows and j represents the number of columns, used to uniquely identify the backlight partition), the TCON module 42 extracts the R, G, and B luminance components of all pixels within the image sub-region mapped by that partition from the standardized image data. To ensure that the calculation results accurately reflect the actual brightness requirements of the region, this embodiment can use the maximum value method or the weighted average method for calculation, without specific limitations.

[0143] Among them, if the maximum value method is used, the maximum value of the R, G, and B luminance components of all pixels in the sub-region of the image is taken as the initial backlight luminance value BL_{in}(i,j) of the sub-region, which is suitable for scenes that need to highlight the highlight details of the image; if the weighted average method is used, the three channels of R, G, and B are weighted and summed according to their contribution to human eye brightness perception (e.g., G channel has the highest weight, R channel is the second highest, and B channel has the lowest weight), and the average value is taken as the initial backlight luminance value BL_{in}(i,j), which is suitable for scenes that need to take into account the overall brightness uniformity of the image.

[0144] The initial backlight brightness value BL_{in}(i,j) is essentially the backlight driving baseline value that meets the basic brightness requirements of the corresponding image sub-region before peak compensation is performed. Finally, after calculating the initial backlight brightness value BL_{in}(i,j) for all backlight zones, the TCON module 42 performs statistical calculations on the initial backlight brightness values ​​of all backlight zones according to the three color channels R, G, and B, respectively, to obtain the average image brightness APL_R, APL_G, and APL_B for each color channel.

[0145] For example, firstly, extract the R channel component BL_{in_R}(i,j), G channel component BL_{in_G}(i,j), and B channel component BL_{in_B}(i,j) corresponding to the initial backlight brightness value of each backlight partition (i,j). Then, sum the same channel components of all partitions respectively. Finally, divide by the total number of backlight partitions (M×N) to obtain the average image brightness of each channel. This average value is used for the calculation of power constraints and current constraints in the subsequent peak enhancement peaking process and is the basic data for realizing multi-constraint dimming.

[0146] After processing by the local dimming submodule 421 in the TCON module 42, the average image brightness APL_R, APL_G, and APL_B of each color channel are obtained and transmitted to the Peaking processing submodule 422. The Peaking processing submodule 422 reads the preset backlight power parameters power_r, power_g, power_b and the total power weight power_w from the TCON configuration register. Among them, power_r, power_g, and power_b represent the backlight power of the R / G / B channels under the preset full white field image, and satisfy power_r + power_g + power_b = power_w.

[0147] Based on the average image brightness APL_R, APL_G, APL_B and the preset backlight power parameters, the power constraint mean value APL` is calculated. The specific calculation steps can be found in the calculation formula in step S202 above, and will not be elaborated here. When the target image is not a full white field (i.e., APL_R, APL_G, and APL_B do not all take the maximum value of 255 at the same time), APL` will be less than the initial global average brightness APLorig, providing a basis for the peak brightness enhancement in monochrome images.

[0148] Next, the Peaking processing submodule 422 in the TCON module 42 calculates the average current constraint value for each color channel.

[0149] For example, the Peaking processing submodule 422 reads preset backlight current limits: I_rmax, I_gmax, I_bmax, and the current backlight currents I_rnorm, I_gnorm, and I_bnorm of each color channel from the configuration register of the TCON module 42; wherein the current backlight is the current operating current of the display panel 10, and the preset backlight current limit is the maximum operating current allowed by the backlight chip of each color channel.

[0150] Based on the preset backlight current limit of each color channel and the current backlight current, the gain limits of the three color channels, R_gain, G_gain and B_gain, are calculated respectively. The specific calculation formula can be referred to the calculation formula in step S203, and no specific restrictions are made here.

[0151] By combining the average image brightness APL_R, APL_G, and APL_B, the average current constraints APLR_limit, APLG_limit, and APLB_limit for each color channel are calculated. The specific calculation formulas can be found in step S204, and no specific limitations are specified here.

[0152] Among them, the current constraint mean value is used to limit the minimum value of the APL of each channel, avoiding excessive current beyond the safe range due to over-compensation of the peak value.

[0153] Next, the Peaking processing sub-module 422 in the TCON module 42 determines the target APL.

[0154] The Peaking processing sub-module 422 takes the maximum value of the power constraint mean value APL`, and the APLR_limit, APLG_limit, and APLB_limit of the current constraints of each channel to obtain the target APL. Since the preset mapping data in this solution, that is, the Peaking curve is a monotonically decreasing function, taking the maximum value of APL is equivalent to taking the minimum value of the backlight driving current. Therefore, the target APL can simultaneously meet the power constraint and the current constraints of the R, G, and B channels, ensuring that the backlight driving operates within the safe power and current ranges.

[0155] Finally, the Peaking processing sub-module 422 in the TCON module 42 determines the target backlight current.

[0156] Exemplarily, the Peaking processing sub-module 422 pre-stores preset mapping data, which is a set of look-up tables or function expressions, representing the monotonically decreasing correspondence between the APL and the backlight current, that is, the smaller the APL, the larger the corresponding backlight current compensation multiple.

[0157] Based on the target APL, through look-up table or function calculation methods, the corresponding peak compensation coefficient PKcoeff is obtained from the preset mapping data; For each backlight zone (i, j), based on the initial backlight brightness value BLin(i, j) and the peak compensation coefficient PKcoeff, the target backlight current BLPeak(i, j) is calculated: BLPeak(i, j)=BLin(i, j)×PKcoeff; For a monochromatic picture scene, because APL`<APLorig, the corresponding PKcoeff is larger, and the backlight brightness can be further increased on the basis of the original Peaking, and the increase range is determined by the difference between APL` and APLorig.

[0158] Subsequently, the Peaking processing sub-module 422 transmits the target backlight current BLPeak(i, j) of each zone to the backlight control (Backlight Control, Bcon) module.

[0159] It is important to understand that the preset mapping data in this step is essentially a set of three Peaking curves corresponding to the Peaking algorithm (corresponding to the R, G, and B color channels respectively). The generation logic can be referred to in steps S301-S303 above, which will not be elaborated here. It is also the core basis for determining the target backlight current in this application embodiment. In this embodiment, after the Peaking processing submodule 422 in the TCON module 42 determines the target backlight current, the final image presentation is completed by the parallel and strictly synchronous cooperation of the backlight driving link and the panel display link. The specific process is as follows: Among them, the backlight driving link refers to the dimming module 44 from the Bcon module 43, and the panel display link refers to the display panel 10 from the TCON module 42.

[0160] For example, the backlight driving link is used to convert the target backlight current data into a physical optical signal to drive the backlight unit to emit light. After receiving the target backlight current BL_{Peak}(i,j) of each zone output by the Peaking processing submodule 422, the Bcon module 43 performs digital-to-analog conversion on the target current data in digital format to generate a PWM signal or analog voltage signal that is proportional to the target brightness value, and its duty cycle or amplitude precisely corresponds to the brightness requirement of each backlight zone.

[0161] The Bcon module 43 transmits the converted analog drive signal synchronously to the dimming module 44 according to the preset hardware interface protocol and timing. The dimming module 44, as the core execution unit of the backlight drive circuit, receives and parses the drive signal, adjusts the conduction current and timing of the LED drive circuit of each backlight zone, controls the lighting brightness of the LED light-emitting chip in each zone, and provides real-time feedback on the backlight working status to ensure that the backlight brightness output is consistent with the target backlight current BL_{Peak}(i,j) and avoids brightness deviation and flicker.

[0162] The panel display link is used to convert standardized image data into deflection control signals for liquid crystal molecules. By precisely controlling the transmittance of liquid crystal molecules to backlight, the grayscale and color details of the image are presented. It works in parallel and strictly synchronized with the backlight driving link, and the two work together to complete the final image display. The specific processing procedure is exemplified as follows: First, the TCON module 42 generates liquid crystal scanning driving signals: starting synchronously with the backlight driving link, the TCON module 42, as the timing core of the entire display system, calls the standardized image data received and stored in step 1 (which has undergone preprocessing such as format unification, noise reduction, and gamma correction, and can be directly used for display control), and performs row and column scanning timing encoding operations on the image data. The core purpose of encoding is to convert two-dimensional image pixel data into driving signals adapted to the hardware of the display panel 10, and finally generate liquid crystal scanning driving signals containing three types of core signals. The specific functions of the three types of signals are as follows: Among them, the row selection signal is used to control the on and off of the row driving circuit inside the display panel 10, selecting the pixel rows of the display panel 10 one by one to ensure that the pixels are driven in row order and avoid image chaos caused by multiple rows of pixels being turned on at the same time; the column driving signal is used to control the column driving circuit inside the display panel 10 to transmit grayscale and color-related driving voltages to each pixel unit of the selected row, providing voltage support for the deflection of liquid crystal molecules; the grayscale control signal is embedded in the row selection signal and the column driving signal, and is used to precisely control the deflection angle of the liquid crystal molecules of each pixel unit, thereby controlling the amount of backlight transmitted, realizing the display of different grayscale levels (such as 0-255 levels), and is the core signal for presenting image details.

[0163] The three types of signals work together to achieve precise control over the row and column driving circuits inside the display panel 10 and the deflection angle of the liquid crystal molecules in each pixel unit, laying the foundation for subsequent image rendering.

[0164] Secondly, after the TCON module 42 completes the encoding of the liquid crystal scanning drive signal, it synchronously transmits the encoded liquid crystal scanning drive signal to the signal receiving interface of the display panel 10 through a dedicated signal interface, according to the preset hardware timing requirements of the display panel 10. The core requirement of this step is strict synchronization, and the specific synchronization logic is as follows: On the one hand, it ensures that the row selection signal output by TCON is precisely aligned with the lighting timing of the corresponding backlight partition driven by the dimming module 44. That is, when TCON selects a certain row of pixels through the row selection signal, the dimming module 44 simultaneously lights up the backlight partition corresponding to that pixel row, avoiding misalignment problems such as "pixel has been driven but backlight is not lit" or "backlight is lit but pixel is not driven". On the other hand, it ensures that the column drive signal and the pixel grayscale display timing are perfectly matched—that is, the time when the column drive signal is transmitted to the pixel unit is consistent with the time required for the liquid crystal molecules of the pixel unit to deflect, so as to avoid display abnormalities such as image ghosting and blurring caused by signal transmission delay and ensure the smoothness of image display.

[0165] Finally, after receiving the liquid crystal scanning drive signal transmitted by TCON through the signal receiving interface, the display panel 10 uses the row drive circuit and column drive circuit integrated inside the panel to work together to perform pixel-level rendering operations. The specific process is exemplified as follows: First, the row drive circuit receives the row selection signal transmitted by TCON and sequentially turns on the corresponding pixel rows, so that all pixel units in the pixel row are in a driveable state. Subsequently, the column drive circuit synchronously receives the column drive signal and grayscale control signal transmitted by TCON and outputs a corresponding voltage to each pixel unit of the selected row. The magnitude of this voltage is determined by the grayscale control signal, which directly controls the degree of deflection of the liquid crystal molecules in the pixel unit. The higher the voltage corresponding to the grayscale control signal, the larger the deflection angle of the liquid crystal molecules, the more backlight light is transmitted, and the brighter the pixel display. The lower the voltage, the smaller the deflection angle of the liquid crystal molecules, the less light is transmitted, and the darker the pixel display.

[0166] In this way, each pixel unit presents the corresponding brightness and color according to the grayscale control signal, completing the pixel-level rendering of the target image. At the same time, the display panel 10 receives the backlight signal driven by the dimming module 44 (i.e., the actual brightness output of each backlight zone), realizing precise coordination between the backlight and the liquid crystal display: the pixel units corresponding to the high-brightness backlight zone have liquid crystal molecules deflected at an angle that adapts to the high light transmittance requirement, ensuring that the highlight areas are bright and clear; the pixel units corresponding to the low-brightness backlight zone have liquid crystal molecules deflected at an angle that adapts to the low light transmittance requirement, ensuring that the dark areas are pure and free of glare.

[0167] Ultimately, under the parallel, synchronous, and coordinated action of the backlight driving link and the panel display link, the display panel 10 stably presents the target image, and the backlight driving is within the preset safe power and current range throughout the process. In addition, it should be understood that the above description is only an exemplary description and no specific limitation is made here.

[0168] Based on the control method of the above control module, this application also discloses a computer-readable storage medium that can implement any of the above control methods.

[0169] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium. When executed, the program can include the processes of the embodiments of the methods described above. The storage medium can be a magnetic disk, optical disk, ROM, etc.

[0170] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0171] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0172] The display devices disclosed in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A display device, characterized in that, The display device includes: Display panel; A backlight module, the backlight module including a backlight driving circuit and a plurality of backlight zones, each backlight zone including at least one light-emitting unit, each light-emitting unit including at least two light-emitting chips, the at least two light-emitting chips corresponding one-to-one with at least two color channels, the backlight driving circuit being electrically connected to the plurality of backlight zones, the backlight driving circuit being configured to drive each light-emitting chip in the at least one light-emitting unit included in each backlight zone to emit light respectively; The control module is connected to the display panel and the backlight driving circuit respectively; The control module is configured as follows: Based on the backlight data of the target image, determine the average image brightness (APL) of each of the at least two color channels; The power constraint mean is calculated based on the preset power ratio and the APL of each color channel. The preset power ratio is used to characterize the proportion of the backlight power of each color channel in the preset backlight power when the display panel presents a preset image. Based on the preset backlight current limit of each color channel, the current backlight current of each color channel, and the APL of each color channel, the average current constraint of each color channel is calculated. The preset backlight current limit of each color channel corresponds to the maximum driving current allowed by the light-emitting chip of each color channel. The target APL is determined based on the average power constraint and the average current constraint of each color channel; Based on the target APL and the preset mapping data, the target backlight current corresponding to each color channel is determined. The preset mapping data includes data characterizing the correspondence between the APL and the backlight current of each color channel. The display panel is controlled to display the target image, and according to the target backlight current, the backlight driving circuit drives each light-emitting chip in at least one light-emitting unit included in each backlight zone to emit light.

2. The display device according to claim 1, characterized in that, The step of determining the target APL based on the average power constraint and the average current constraint of each color channel is specifically configured as follows: The maximum value between the average power constraint and the average current constraint of each color channel is determined as the target APL.

3. The display device according to claim 1, characterized in that, The step of calculating the average current constraint value of each color channel based on the preset backlight current limit of each color channel, the current backlight current of each color channel, and the APL of each color channel is specifically configured as follows: The ratio of the current backlight current of each color channel to the preset backlight current limit of the corresponding color channel is determined as the gain limit of each color channel. The product of the APL of each color channel and the gain limit of the corresponding color channel is determined as the average current constraint value of each color channel.

4. The display device according to claim 1, characterized in that, The power constraint mean value is calculated based on the preset power ratio and the APL of each color channel, and is specifically configured as follows: The proportion of the backlight power of each color channel in the preset backlight power is used as the weighting coefficient of the corresponding channel. The APL of each color channel is then weighted and averaged to obtain the power constraint mean.

5. The display device according to claim 1, characterized in that, The preset image is a full white field image.

6. The display device according to claim 1, characterized in that, The backlight data includes the partition backlight data of each of the backlight zones. The control of the display panel to present the target image, and the driving of each light-emitting chip in at least one light-emitting unit included in each backlight zone to emit light through the backlight driving circuit according to the target backlight current, are specifically configured as follows: Based on the target backlight current corresponding to the target color channel and the partition backlight data of each of the backlight partitions, the partition backlight current corresponding to each of the backlight partitions is determined, wherein the target color channel is any one of the at least two color channels; The backlight driving circuit drives the target light-emitting chip of each light-emitting unit in each backlight zone to emit light based on the partition backlight current corresponding to each backlight zone, wherein the target light-emitting chip corresponds to the target color channel.

7. The display device according to claim 1, characterized in that, The at least two color channels include a red channel, a green channel, and a blue channel; The preset mapping data includes a first preset mapping data, a second preset mapping data, and a third preset mapping data. The first preset mapping data includes data representing the correspondence between the APL of the red channel and the backlight current corresponding to the red channel. The second preset mapping data includes data representing the correspondence between the APL of the green channel and the backlight current corresponding to the green channel. The third preset mapping data includes data representing the correspondence between the APL of the blue channel and the backlight current corresponding to the blue channel.

8. The display device according to claim 1, characterized in that, The step of determining the target backlight current corresponding to each color channel based on the target APL and preset mapping data is specifically configured as follows: Based on the target mapping data, determine the backlight current corresponding to the target APL, and use the backlight current corresponding to the target APL as the target backlight current corresponding to the target color channel; The target mapping data represents the correspondence between the APL of the target color channel and the backlight current corresponding to the target color channel, wherein the target color channel is any one of the at least two color channels.

9. The display device according to claim 8, characterized in that, The control module is also configured to: Select multiple preset APLs; For each preset APL, determine the backlight current corresponding to the target color channel under the preset APL; The target mapping data is obtained based on the plurality of preset APLs and the backlight current corresponding to the target color channel under each preset APL.

10. The display device according to claim 9, characterized in that, The backlight current corresponding to the target color channel under the preset APL is determined for each preset APL, and is specifically configured as follows: The control panel displays the test image. The test image includes a first image region located at the center and a second image region surrounding the first image region. The grayscale value of the first image region is 255, and the grayscale value of the second image region is 0. The area ratio of the first image region in the test image is the preset APL corresponding to the test image. When the test image is displayed on the display panel, the partition current of the target backlight partition in the target color channel is obtained, and the partition current is used as the backlight current of the target color channel under the preset APL corresponding to the test image. The target backlight partition is the backlight partition that corresponds to the first image area among the plurality of backlight partitions.

Images