A system and method for display screen dynamic contrast optimization

Abstract

The present application relates to the technical field of display dynamic contrast optimization, and particularly relates to a display dynamic contrast optimization system and method. The method comprises the following steps: obtaining the luminance distribution state of a to-be-displayed picture in a current display period of a display screen, collecting the outputtable backlight luminance range of the display screen, and determining the luminance distribution reference of the to-be-displayed picture on the display screen; based on the luminance distribution reference, dividing the display picture into multiple display partitions, and combining the luminance change requirements of each partition to calculate the partition luminance change load degree; and according to the partition luminance change load degree, adjusting the contrast and luminance; the present application realizes the balance between picture level enhancement and display stability in the display dynamic contrast adjustment process by performing partition analysis on the display picture based on the luminance distribution reference.

Description

Technical Field

[0001] This invention relates to the field of dynamic contrast optimization technology for displays, and more particularly to a system and method for dynamic contrast optimization of displays. Background Technology

[0002] To enhance the sense of depth and detail in images, existing display systems typically employ dynamic contrast adjustment mechanisms. By adjusting backlight brightness or pixel drive parameters, these mechanisms enable higher visual contrast across different content scenarios. However, in practical applications, the brightness distribution of a display screen exhibits significant spatial differences and dynamic variations, and different areas also have varying capacities for backlight adjustment and pixel brightness compensation. Existing dynamic contrast adjustment schemes often employ uniform adjustment across the entire screen or are based on simple area divisions. They frequently update contrast parameters solely based on the overall brightness statistics of the current image, lacking comprehensive consideration of the differences in brightness variations between display areas and display stability. When the displayed content changes within adjacent display cycles, the backlight output adjustment and pixel brightness response become asynchronous, easily leading to problems such as sudden changes in local brightness, image flickering, or distortion, affecting display continuity and the viewing experience. Summary of the Invention

[0003] Therefore, it is necessary to provide a system and method for dynamic contrast optimization of a display screen to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above objective, a method for dynamic contrast optimization of a display screen includes the following steps: Step S1: During the current display cycle of the display screen, obtain the brightness distribution state of the image to be displayed, and collect the output backlight brightness range of the display screen to determine the brightness distribution benchmark of the image to be displayed on the display screen. Step S2: Based on the brightness allocation benchmark, the display screen is divided into multiple display zones, and the brightness change load of each zone is calculated in combination with the brightness change requirements of each zone; according to the brightness change load of each zone, and in combination with the capacity of each zone to handle backlight changes and pixel brightness compensation, the contrast adjustment area and brightness constraint area are determined. Step S3: Based on the contrast adjustment area and the brightness constraint area, when the displayed content changes, limit the brightness output adjustment range of each display area in adjacent display cycles. Step S4: When the brightness output adjustment range of each display area meets the preset conditions, update the contrast control parameters of the display screen according to the brightness output status of the contrast adjustment area and the brightness constraint area in the current display cycle.

[0005] The present invention also provides a dynamic contrast optimization system for a display screen, for performing the dynamic contrast optimization method for a display screen as described above, the dynamic contrast optimization system for a display screen comprising: The brightness distribution reference determination module is used to obtain the brightness distribution status of the image to be displayed within the current display cycle of the display screen, and to collect the output backlight brightness range of the display screen to determine the brightness distribution reference of the image to be displayed on the display screen. The display partitioning module is used to divide the display screen into multiple display partitions based on the brightness allocation benchmark, and calculate the brightness change load of each partition in combination with the brightness change requirements of each partition; based on the brightness change load of each partition, and in combination with the capacity of each partition to handle backlight changes and pixel brightness compensation, the contrast adjustment area and brightness constraint area are determined. The output amplitude adjustment module is used to limit the brightness output adjustment amplitude of each display area in adjacent display cycles when the displayed content changes, based on the contrast adjustment area and the brightness constraint area. The contrast control parameter update module is used to update the contrast control parameters of the display screen according to the brightness output status of the contrast adjustment area and the brightness constraint area in the current display cycle when the brightness output adjustment range of each display area meets the preset conditions.

[0006] The beneficial effects of this invention are as follows: By acquiring the brightness distribution of the displayed image within the current display cycle and determining the brightness allocation benchmark in conjunction with the backlight brightness range that the display can output, contrast adjustment is no longer based on fixed parameters or empirical settings. Instead, it establishes a correspondence with the overall brightness structure of the current image and the backlight output capability, reducing the risk of brightness mapping imbalance from the source. Furthermore, by dividing the display image into multiple display zones and introducing analysis of the load degree of brightness changes in each zone, as well as the load capacity of backlight changes and pixel brightness compensation, the division of contrast adjustment areas and brightness constraint areas has a clear physical and display basis, avoiding local overexposure or detail compression problems caused by uniform adjustment of the entire screen. When the displayed content changes, the brightness output adjustment range in adjacent display cycles is limited for different display areas, allowing brightness changes to evolve gradually along the display cycle. This effectively suppresses display instability phenomena such as flickering and brightness jumps caused by rapid backlight changes and asynchronous pixel compensation. Finally, by updating the contrast control parameters after the brightness output adjustment range meets the stability conditions, the adjustment results of the contrast parameters can truly reflect the brightness output status of each display area within the current display cycle. This enhances the image layering and detail while taking into account the continuity and stability of the display process, thereby improving the overall display quality and user viewing comfort of the display screen in dynamic scenes. Attached Figure Description

[0007] Figure 1 This is a flowchart illustrating the steps of a method for optimizing dynamic contrast in a display screen. Figure 2 This is a schematic diagram of a dynamic contrast optimization system for displays. Figure 3 A schematic diagram of the dynamic contrast optimization process for displays; The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0008] The technical method of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0009] Furthermore, the accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor methods and / or microcontroller methods.

[0010] It should be understood that although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0011] To achieve the above objectives, please refer to Figures 1 to 3 A method for dynamic contrast optimization of a display screen includes the following steps: Step S1: During the current display cycle of the display screen, obtain the brightness distribution state of the image to be displayed, and collect the output backlight brightness range of the display screen to determine the brightness distribution benchmark of the image to be displayed on the display screen. Step S2: Based on the brightness allocation benchmark, the display screen is divided into multiple display zones, and the brightness change load of each zone is calculated in combination with the brightness change requirements of each zone; according to the brightness change load of each zone, and in combination with the capacity of each zone to handle backlight changes and pixel brightness compensation, the contrast adjustment area and brightness constraint area are determined. Step S3: Based on the contrast adjustment area and the brightness constraint area, when the displayed content changes, limit the brightness output adjustment range of each display area in adjacent display cycles. Step S4: When the brightness output adjustment range of each display area meets the preset conditions, update the contrast control parameters of the display screen according to the brightness output status of the contrast adjustment area and the brightness constraint area in the current display cycle.

[0012] All specific values ​​involved in this embodiment are exemplary parameters used to clearly illustrate the technical operation process and are not the only limitation of the present invention.

[0013] In one embodiment, at the beginning of each display cycle, the display control chip reads the pixel-by-pixel brightness values ​​of the image to be displayed from the image processing pipeline to form a brightness distribution matrix corresponding to the current display cycle. The brightness values ​​are represented in 8-bit grayscale format, ranging from 0 to 255. Simultaneously, the backlight brightness range allowed to be output by the display in the current operating state is read from the display backlight driver module, including the minimum backlight output brightness value. and maximum output brightness value .

[0014] After obtaining the brightness distribution matrix and backlight brightness range, the brightness distribution matrix is ​​normalized to map the image brightness distribution to […]. , Within the range, and using this mapping relationship as the brightness allocation benchmark in the current display cycle, it is used to characterize the basic brightness configuration state of the image to be displayed under the conditions of this display screen.

[0015] Based on the brightness allocation benchmark determined in step S1, the display screen is divided into multiple display zones according to the physical layout of the backlight control unit and the pixel drive coverage relationship. Each display zone corresponds to at least one backlight control unit and its covered pixel area. For each display zone, the offset of pixel brightness relative to the brightness allocation benchmark is extracted, the regional distribution of brightness stretching and compression within the zone is statistically analyzed, and the brightness adjustment intensity required for the display zone to perform contrast adjustment is evaluated by combining the overall span and concentration of brightness changes. The evaluation result is quantified as the brightness change load level of the zone. Subsequently, the brightness change load level of the zone is compared and analyzed with the actual capabilities of the display zone in terms of backlight output adjustment range and pixel brightness compensation response speed. When the brightness change load level of the zone is within the stable bearing range of the zone, the corresponding display zone is determined as a contrast adjustment area; when the brightness change load level of the zone approaches or exceeds its bearing limit, the corresponding display zone is determined as a brightness constraint area.

[0016] When a change in displayed content is detected, the brightness output state of the contrast adjustment area and the brightness constraint area at the end of the current display cycle is read as the starting brightness state of each display area for the cycle. Using adjacent display cycles as the time axis, the direction and magnitude of brightness output changes in each display area are continuously tracked to form a corresponding brightness evolution trajectory. Based on this brightness evolution trajectory, the allowable brightness output change range boundary of the contrast adjustment area is relaxed, allowing for greater brightness adjustment space without causing visual instability; simultaneously, the brightness change range of the brightness constraint area is restricted, keeping its brightness output change within a small range. Based on the combined effect of relaxation and restriction, the brightness change ranges of the two types of display areas are coordinated, ensuring that the brightness output adjustment range of each display area in adjacent display cycles falls within the stable brightness range that the display screen can display, and this range is used as the basis for brightness output adjustment in the next display cycle.

[0017] When the brightness output adjustment range of each display area meets the preset stability condition in adjacent display cycles, the system updates the global contrast control parameters of the display screen based on the brightness output state of the contrast adjustment area and the brightness constraint area in the current display cycle. The update includes synchronous correction of the backlight drive gain coefficient and the pixel brightness mapping curve, so that the updated contrast control parameters are consistent with the brightness distribution state of the current display area.

[0018] In another embodiment, the display screen is a Mini-LED display screen with multi-level backlight driving capability, and the backlight brightness range is divided into 256 controllable levels according to the driving level. The brightness distribution state is obtained by the image signal processing module extracting the Y component in the YUV space, and the backlight brightness range is read in real time by the backlight control register. The system synchronously samples the brightness distribution state and the output brightness range of the backlight using the display cycle as the time unit, and generates a corresponding brightness allocation benchmark table based on the sampling results. This benchmark table serves as a unified reference in subsequent zoning analysis.

[0019] The display screen is divided into 48 display zones, each in an 8x6 grid. The system calculates the brightness variation load index for each display zone, with brightness span accounting for 0.6 and brightness concentration accounting for 0.4. Calculations show that some display zones located in the main area of ​​the screen have a load index below 0.45 and good synchronization between backlight and pixel compensation response; these zones are classified as contrast adjustment zones. Conversely, display zones located at the edges of the screen, with concentrated brightness variations and limited backlight adjustment margin, have a load index above 0.7 and are classified as brightness constraint zones.

[0020] The upper limit for brightness variation in the contrast adjustment area is set to 1.5 times its historical average brightness variation, while the brightness variation in the brightness constraint area is limited to no more than 0.8 times the historical average. The system dynamically trims the brightness output of each zone based on the brightness evolution trend of adjacent display cycles, preventing brightness abrupt changes from accumulating in spatial or temporal dimensions.

[0021] When the brightness output adjustment range is not exceeded within three consecutive display cycles, the contrast control parameter update process is triggered. The new contrast parameters are written into the display control register and used as the default control parameters for subsequent display cycles, thus completing a dynamic contrast adjustment process.

[0022] Please refer to [link / reference needed] for further information. Figure 3 The left screen in the figure represents the initial brightness distribution acquisition and benchmark establishment stage; the middle screen shows the screen partitioning based on the controllable range of backlight, and initially identifies the adjustment areas that need to enhance contrast and the constraint areas that need to be stably controlled; the right screen finally shows the optimization results of the brightness output amplitude of each partition after collaborative limitation and adjustment in adjacent display cycles.

[0023] Of particular importance, step S1 includes: Within the current display cycle, the brightness of the screen to be displayed is statistically analyzed area by area to obtain the brightness distribution status that reflects the overall brightness and darkness structure of the screen. When acquiring the brightness distribution status, read the range of backlight brightness that the display can output in the current working mode; Based on the brightness distribution state and backlight brightness range, a matching analysis is performed on the correspondence between different brightness ranges and backlight output capabilities in the display screen. Based on the matching analysis results, the available brightness mapping range of the image to be displayed on the display screen is determined, and a brightness allocation benchmark is formed for subsequent display partitioning and contrast adjustment.

[0024] In one embodiment, within the current display cycle, the display control unit performs regional brightness statistics on the screen to be displayed. Specifically, the screen is divided into several statistical units according to the effective display area of ​​the display screen. Within each statistical unit, the average and extreme value ranges of pixel brightness are calculated to obtain a brightness distribution state reflecting the overall brightness structure of the screen. This brightness distribution state describes the proportion of different brightness intervals in the screen. Simultaneously with completing the brightness distribution statistics, the display control unit reads the backlight output brightness range of the display screen in the current operating mode, including the minimum stable output brightness and the maximum allowable output brightness of the backlight, thereby determining the physical boundaries of backlight adjustment under the current display conditions. Subsequently, the brightness distribution state is correlated with the backlight brightness range for analysis. Specifically, based on the distribution ratio of different brightness intervals in the screen, it is determined whether there is corresponding brightness adjustment space within the backlight output range for each brightness interval, and the coverage of the backlight output capability within different brightness intervals is analyzed. Based on the above correlation analysis, the range of brightness intervals that can be stably mapped to the screen under the current display conditions is determined, and this brightness interval is used as a brightness allocation benchmark to constrain the overall reference range of brightness adjustment during subsequent display partitioning and contrast adjustment processes.

[0025] Preferably, step S2 includes: Based on the brightness allocation benchmark, the image to be displayed is divided into multiple display zones on the display screen according to the backlight controllable range and pixel driving structure; For each display zone, determine the deviation of the brightness distribution within the zone from the brightness allocation benchmark, and extract the brightness change requirements of the brightness variation amplitude and density of the display zone. Based on the brightness change requirements, calculate the brightness change load of each display zone within the current display cycle; By combining the load level of brightness changes in each display zone, the load capacity of the corresponding display zone during backlight output adjustment and pixel brightness compensation is analyzed. Based on the matching results of the load level and carrying capacity of the brightness change of each zone, the display zones that need to be intervened in contrast adjustment are determined as contrast adjustment areas, and the display zones that limit brightness changes to maintain display stability are determined as brightness constraint areas.

[0026] In one embodiment, within the current display cycle, based on a determined brightness allocation benchmark, the distribution of the controllable backlight units of the display screen and the pixel driving structure are analyzed accordingly. Specifically, according to the physical control range of the backlight partitions and the driving boundaries of the pixel array in the row and column directions, the image to be displayed is mapped to the spatial coordinate system of the display screen, and several display partitions consistent with the backlight output and pixel driving are formed in this coordinate system, thereby ensuring that subsequent analysis is performed within independently adjustable display units. For each display partition, its actual brightness distribution state within the current display cycle is obtained and compared zone by zone with the brightness allocation benchmark to determine the deviation of the brightness within the partition from the benchmark. Based on this, the magnitude of the brightness change from dark to bright within the partition is statistically analyzed, and the spatial concentration of this change within the partition is analyzed, thereby forming a brightness change requirement characterizing the sensitivity of the display partition to brightness adjustment.

[0027] After obtaining the brightness change requirements, the intensity of brightness adjustment that the display zone bears during the current display cycle is comprehensively evaluated by combining the span and concentration of brightness changes within the zone. The evaluation results are quantified as the brightness change load of the zone to reflect the inherent pressure level of the zone on contrast adjustment.

[0028] Based on this, the carrying capacity of each display zone under the combined effect of backlight output adjustment and pixel brightness compensation is analyzed according to the brightness variation load of each zone. Specifically, within the range of output backlight brightness, it is determined whether the pixel brightness compensation within the zone can maintain a stable response with backlight changes, thereby evaluating the matching state between backlight adjustment and pixel compensation. Finally, based on the matching results between the brightness variation load and carrying capacity of each zone, the display zones are classified: display zones with high brightness variation load and good carrying capacity matching are identified as contrast adjustment areas; display zones with high brightness variation load but limited carrying capacity and requiring suppression of brightness fluctuations are identified as brightness constraint areas, providing a regional basis for subsequent brightness output adjustment.

[0029] Preferably, based on the brightness allocation criterion, the image to be displayed is divided into multiple display zones on the display screen according to the backlight controllable range and pixel driving structure, including: Based on the brightness allocation benchmark, the distribution of backlight areas in the display screen that can participate in brightness adjustment is identified, and the pixel drive coverage is determined. Based on the backlight area distribution and pixel drive coverage, mark the boundaries of the display area in the display screen; The screen to be displayed is divided into multiple display zones according to the boundaries of the display area.

[0030] In one embodiment, given a brightness allocation reference, the display control unit, in conjunction with the backlight control structure of the display screen, identifies backlight areas in the display screen that can participate in brightness adjustment. Specifically, based on the available brightness mapping range determined in the brightness allocation reference, backlight output units that are allowed to participate in brightness adjustment within the current display cycle are selected, forming a corresponding backlight area distribution. This backlight area distribution reflects the spatial position and coverage range of the backlight that can be adjusted in brightness within the display screen plane. Simultaneously with determining the backlight area distribution, the display control unit determines the pixel drive coverage range corresponding to the backlight areas based on the pixel drive structure of the display screen. The pixel drive coverage range characterizes the pixel areas that can achieve effective brightness response through pixel drive under the influence of backlight brightness changes, thereby providing pixel-side structural constraints for the subsequent determination of display area boundaries. Subsequently, the backlight area distribution and pixel drive coverage range are marked correspondingly in the display screen. Specifically, the overlap between the controllable backlight area and the effective pixel drive coverage area is identified in the display screen, and the display area boundary is marked along the position where the backlight control range changes, so that the marked display area boundary can reflect the spatial boundary between backlight adjustment capability and pixel response capability. After marking the display area boundaries, the display control unit divides the screen to be displayed into multiple display zones based on these boundaries. Each display zone is relatively consistent in backlight adjustment capability and pixel driving structure, thus providing clear and stable spatial units for subsequent zone brightness analysis and contrast adjustment.

[0031] In another implementation, the display screen employs a zoned backlight structure. Under the constraint of a brightness allocation reference, the display control unit directly distributes the backlight zones that can participate in brightness adjustment as backlight areas, and simultaneously determines the pixel drive coverage area corresponding to each backlight zone. Subsequently, based on the backlight zone boundaries and combined with the pixel drive coverage area, the boundary positions between the backlight zones are marked on the displayed screen to form the display area boundaries. Finally, according to the display area boundaries, the screen to be displayed is divided into several display zones, each display zone maintaining a one-to-one correspondence with its corresponding backlight zone and pixel drive unit, for subsequent independent brightness evaluation and contrast adjustment of each display zone.

[0032] Preferably, marking the boundary of the display area in the display screen according to the backlight area distribution and pixel driving coverage includes: Determine the spatial distribution area in the display screen where the backlight output participates in brightness adjustment based on the backlight area distribution; Determine the effective pixel response area within the pixel driver coverage area; The spatial distribution area involved in backlight adjustment is mapped to the effective pixel response area to determine the overlapping area; Along the edge of the overlapping area, identify the location where the consistency of backlight output change and pixel brightness response in brightness change in the display screen breaks, and use this location as the boundary of the display area.

[0033] In one embodiment, based on the obtained backlight area distribution and pixel drive coverage, the display control unit determines the backlight output spatial distribution area in the display screen that actually participates in brightness adjustment. This spatial distribution area is used to characterize the specific location range where backlight brightness changes can be adjusted and act on the display screen within the current display cycle, providing a spatial basis for subsequent brightness response analysis on the backlight side. Subsequently, the display control unit determines the effective pixel response area corresponding to the backlight output spatial distribution area based on the pixel drive structure. The effective pixel response area reflects the set of pixels that can effectively compensate for or respond to brightness changes through pixel drive when backlight brightness changes, thereby limiting the actual bearing range of pixel-side backlight changes. After determining the backlight output spatial distribution area and the effective pixel response area, the display control unit performs a corresponding analysis of their spatial positions in the display screen and extracts their overlapping area. The overlapping area is used to characterize the display area where backlight brightness changes can be effectively responded to by pixel brightness, and is the effective working area of ​​the synergistic effect of backlight adjustment and pixel drive.

[0034] Furthermore, the display control unit detects the consistency of brightness changes between backlight brightness changes and pixel brightness responses along the edge of the overlapping area. Specifically, by comparing the spatial continuity of the backlight brightness change amplitude and the corresponding pixel brightness change amplitude, the position where the brightness change changes from synchronous to asynchronous is identified, and the position where the consistency of brightness change breaks is determined as the boundary of the display area, thereby completing the marking of the boundary of the display area in the display screen.

[0035] In another embodiment, the display screen employs a regular array-type partitioned backlight structure. The display control unit directly uses the output range of each backlight partition as the spatial distribution area for backlight output brightness adjustment, and determines the effective pixel response area based on the pixel driving unit corresponding to the backlight partition. Subsequently, a one-to-one correspondence is established between the backlight partitions and the pixel driving coverage areas to obtain the corresponding overlapping areas, and the consistency between backlight brightness changes and pixel brightness responses is detected at the edges of the backlight partitions. When a significant discontinuity in brightness change is detected at the partition boundary, that location is marked as the display area boundary.

[0036] Preferably, for each display zone, the deviation of the brightness distribution within the zone from the brightness allocation benchmark is determined, and the brightness change requirements for the brightness variation amplitude and density of the display zone are extracted, including: For each display zone, obtain the actual brightness distribution status of the display zone within the current display cycle; The actual brightness distribution of the display partition is compared with the brightness allocation reference to determine the deviation of the brightness distribution within the display partition from the brightness allocation reference. Based on the brightness deviation, the range of brightness variation from high to low within the display zone is analyzed and used as the brightness variation range; Based on the magnitude of brightness variation, the statistical display shows the regional distribution characteristics of concentrated brightness variations within the partition, thus obtaining the density characteristics of brightness variation. The brightness variation amplitude and the variation density characteristics are combined to form the brightness variation demand.

[0037] In one embodiment, for each display partition, within the current display cycle, the drive output state of each pixel within the partition is collected based on the display driver control unit to obtain the actual brightness distribution state of the display partition within the current display cycle. The actual brightness distribution state is characterized by the spatial distribution of pixel brightness values ​​within the partition, reflecting the brightness presentation of the display partition within the current display cycle. After obtaining the actual brightness distribution state, the actual brightness distribution state of the display partition is compared partition by partition with a predetermined brightness allocation benchmark. By calculating the difference between the pixel brightness value at the corresponding position within the partition and the target brightness value in the brightness allocation benchmark, the deviation of the brightness distribution within the display partition from the brightness allocation benchmark is determined. The deviation characterizes the overall degree to which the brightness of the display partition is higher or lower than the benchmark brightness allocation. Based on this, the trend of brightness variation from high to low within the display partition is analyzed according to the brightness deviation, and the range of difference between the maximum and minimum brightness deviation values ​​within the partition is extracted. This range of difference is determined as the brightness variation amplitude of the display partition, characterizing the intensity level of the brightness variation within the display partition.

[0038] Furthermore, after determining the magnitude of brightness variation, based on the spatial distribution of brightness deviation values ​​within the partition, statistical analysis is performed on the areas where brightness variations are concentrated, identifying the characteristics of dense distribution of brightness deviation values ​​in local areas, and thereby obtaining the variation density feature characterizing the degree of concentration of brightness variations within the display partition; wherein, the variation density feature is used to reflect whether the brightness variations within the display partition are locally concentrated or relatively dispersed.

[0039] Finally, the brightness change amplitude and the change density feature are combined to form a brightness change requirement that characterizes the contrast and brightness adjustment needs of the display zone in the current display cycle; the brightness change requirement serves as the basis for subsequently determining whether the display zone is suitable for contrast adjustment and for coordinating and controlling backlight output and pixel brightness compensation.

[0040] Preferably, calculating the brightness variation load of each display zone within the current display cycle based on brightness variation requirements includes: Based on the brightness change requirements, identify the distribution of display zones where brightness is stretched or compressed during contrast adjustment; Based on the regional distribution of brightness stretching or compression, analyze and display the overall span of brightness adjustment within the partition; Determine the distribution of brightness adjustment areas within the display partition and identify the concentrated distribution of brightness changes; Based on the overall span and distribution of brightness adjustments, assess the difficulty of adjusting the display zones when performing contrast adjustments. The adjustment difficulty is used as the load level of brightness change in each display zone during the current display cycle.

[0041] In one embodiment, based on the brightness change requirements corresponding to each display partition, the regions where brightness stretching or compression occurs during contrast adjustment are identified. The brightness stretching region refers to the area where brightness needs to expand towards higher brightness relative to the brightness allocation baseline, and the brightness compression region refers to the area where brightness needs to contract towards lower brightness. By analyzing the amplitude and density of brightness changes in the brightness change requirements, the spatial distribution of brightness stretching or compression within the display partition is determined. After identifying the brightness stretching or compression regions, based on the distribution of these regions, the brightness range involved in brightness adjustment within the display partition is analyzed. The span between the maximum and minimum brightness adjustment values ​​that the display partition needs to cover during contrast adjustment is calculated, and this span is used as a parameter characterizing the overall span of brightness adjustment within the display partition, reflecting the overall scale of brightness adjustment within the display partition.

[0042] Furthermore, based on determining the overall span of brightness adjustment, the spatial distribution of brightness adjustment areas within the display partition is analyzed to determine whether brightness adjustments are concentrated in a local area of ​​the display partition or dispersed across multiple areas. Specifically, distribution parameters characterizing the concentrated distribution of brightness changes are obtained by statistically analyzing the area ratio, connectivity, or clustering degree of the brightness stretching or compression areas. After obtaining the overall span of brightness adjustment and the distribution of brightness adjustment areas, both are comprehensively analyzed to assess the adjustment difficulty faced by the display partition when performing contrast adjustment within the current display cycle. This adjustment difficulty characterizes the complexity of achieving the target brightness allocation under constraints of a given backlight adjustability range and pixel brightness compensation capability.

[0043] Finally, the adjustment difficulty is determined as the degree of brightness change load of the corresponding display zone within the current display cycle; the degree of brightness change load serves as the basis for subsequently determining the contrast adjustment area and brightness constraint area, as well as allocating backlight output resources and pixel brightness compensation intensity.

[0044] Preferably, the analysis of the load-bearing capacity of each display zone during backlight output adjustment and pixel brightness compensation processes, based on the load degree of brightness variation in each display zone, includes: Based on the load level of brightness changes in each display zone, extract the corresponding backlight brightness adjustment range of the display zone during contrast adjustment. Within the backlight brightness adjustment range, analyze the response status of pixel brightness compensation in the display partition; Based on the response status of pixel brightness compensation, evaluate the degree of coordination between backlight brightness adjustment and pixel brightness compensation within the display zone; Based on the degree of coordination and matching, the analysis shows the stable load-bearing capacity of the display partition under the combined effect of backlight output adjustment and pixel brightness compensation.

[0045] In one embodiment, the required backlight brightness adjustment range for each display partition during contrast adjustment is determined based on the partition brightness change load corresponding to each partition. This backlight brightness adjustment range defines the upper and lower limits of backlight brightness changes within the display partition while meeting brightness change requirements, and maintains consistency with the backlight output range of the display screen in the current operating mode. After determining the backlight brightness adjustment range, the response state of pixel brightness compensation in the display partition is analyzed within this range. Specifically, by analyzing the consistency of the pixel driving structure's response to the target brightness value under different backlight brightness levels, it is determined whether pixel brightness compensation can maintain the expected brightness expression effect during backlight brightness changes.

[0046] After obtaining the response state of pixel brightness compensation, the degree of coordination between backlight brightness adjustment and pixel brightness compensation within the display zone is evaluated based on the response state. This degree of coordination characterizes the spatial and amplitude coordination between backlight brightness changes and pixel brightness compensation changes, reflecting whether they can achieve smooth and continuous brightness adjustment under their combined effect. Based on this degree of coordination, the stable load-bearing capacity of the display zone under the combined effect of backlight output adjustment and pixel brightness compensation is analyzed. This stable load-bearing capacity characterizes the ability of the display zone to maintain brightness stability and display consistency when performing contrast adjustment under the current brightness change load condition.

[0047] The aforementioned stable load-bearing capacity will serve as an important basis for subsequently determining whether a display partition is suitable as a contrast adjustment area or a brightness constraint area.

[0048] Preferably, step S3 includes: When the displayed content changes, the brightness output state of the contrast adjustment area and the brightness constraint area in the current display cycle is obtained as the cycle start brightness state of the corresponding display area. Based on the initial brightness state of the cycle, the direction and magnitude of brightness change of each display area in adjacent display cycles are tracked to form a brightness evolution trajectory; Based on the brightness evolution trajectory, the contrast adjustment area relaxes the boundary of brightness variation range according to the display layer enhancement requirements; The brightness constraint area synchronously restricts the magnitude of brightness changes, suppressing the abrupt trend of brightness changes in adjacent display cycles; Based on the simultaneous relaxation and restriction, the brightness variation range of the contrast adjustment area and the brightness constraint area is coordinated and adjusted to maintain it within the brightness range that the display area can stably display, and the brightness range is used as the brightness output adjustment range of the corresponding display area in adjacent display cycles.

[0049] In one embodiment, when a change in the displayed content is detected, the brightness output state of the contrast adjustment area and the brightness constraint area within the current display cycle is obtained, and the obtained brightness output state is recorded as the cycle start brightness state of the corresponding display area; wherein, the cycle start brightness state is used as a reference starting point for subsequent brightness change analysis.

[0050] After obtaining the initial brightness state of the cycle, the brightness change direction and amplitude of each display area in adjacent display cycles are continuously tracked based on the initial brightness state of the cycle. The brightness change direction and amplitude are then correlated in the order of the display cycles to form a brightness evolution trajectory that reflects the continuous trend of brightness change. The brightness evolution trajectory is used to describe the evolution process of the brightness of the display area as the display cycle progresses.

[0051] Based on the established brightness evolution trajectory, for the display area identified as the contrast adjustment region, the allowable brightness change range boundary in the brightness evolution trajectory is relaxed in combination with its corresponding display layer enhancement requirements; wherein, the relaxation process is used to allow the contrast adjustment region to obtain a larger brightness change space in adjacent display cycles, so as to enhance the display layer and contrast performance.

[0052] For display areas identified as brightness-constrained regions, based on their display stability requirements, the range of brightness changes is simultaneously restricted under the constraint of the brightness evolution trajectory. By limiting the range of brightness changes in adjacent display cycles, the rapid transition or abrupt change in brightness is suppressed, thereby maintaining the display continuity and stability of the brightness-constrained regions.

[0053] Based on the simultaneous effect of widening the brightness variation range in the contrast adjustment area and limiting the brightness variation range in the brightness constraint area, the brightness variation range of the two types of display areas is coordinated and adjusted. Through coordinated adjustment, the brightness variation range of each display area is kept within its own stable brightness range, and the brightness range is determined as the brightness output adjustment range of the corresponding display area in adjacent display cycles, which is used to guide the contrast control in subsequent display cycles.

[0054] Preferably, based on the brightness evolution trajectory, the boundary of brightness variation in the contrast adjustment area is relaxed according to the display layer enhancement requirements, including: Based on the brightness evolution trajectory, identify the main evolution direction of brightness change in the contrast adjustment area within adjacent display cycles; Analyze the brightness variation segments in the contrast adjustment region that contribute significantly to the display hierarchy along the evolution direction; Assess the margin of brightness variation that the brightness variation segment can withstand during a continuous display cycle; Based on the brightness variation margin, the boundary of the brightness variation range of the contrast adjustment area within adjacent display cycles is broadened in stages.

[0055] In one embodiment, after obtaining the brightness evolution trajectory corresponding to the contrast adjustment region, the brightness evolution trajectory is analyzed to determine the main evolution direction of the brightness change in the contrast adjustment region within adjacent display cycles; wherein, the main evolution direction is used to characterize the trend of brightness change as the display cycle progresses, which is an overall increase, an overall decrease, or a local enhancement.

[0056] After identifying the main evolution direction, the performance of different brightness segments in the display content is analyzed along the evolution direction, and brightness change segments that contribute significantly to the differentiation of display levels and the presentation of details are selected. The brightness change segments usually correspond to areas in the image with obvious level changes, frequent transitions between bright and dark, or sensitive contrast perception.

[0057] After determining the brightness variation segment, the brightness variation margin that the segment can bear without causing brightness abrupt changes or display instability is evaluated by combining the changes of the segment in the brightness evolution trajectory within a continuous display cycle; wherein, the brightness variation margin is used to reflect the remaining adjustment space of the current brightness segment relative to the stable output capability of the display screen.

[0058] Based on the obtained brightness variation margin, the brightness variation range boundary of the contrast adjustment area in adjacent display cycles is broadened in stages according to the size of the brightness variation margin corresponding to different brightness variation segments. By giving a larger brightness variation range to the segments with larger brightness variation margin, while maintaining a relatively convergent variation boundary for the segments with smaller margin, the overall display stability is maintained while enhancing the display layer.

[0059] Of particular importance, step S4 includes: When the brightness output adjustment range of each display area meets the preset stability conditions, the actual brightness output state of the contrast adjustment area and the brightness constraint area in the current display cycle is collected to form a regional brightness reference set. Based on the regional brightness reference set, the contribution of brightness stretching in the contrast adjustment region to the changes in image hierarchy is analyzed, and the constraint weight of the brightness-limited state in the brightness-constrained region on display stability is evaluated simultaneously. Based on the correspondence between the degree of contribution and the constraint weight, the contrast adjustment coefficient used to balance the mapping relationship between backlight output change and pixel brightness is calculated. Based on the contrast adjustment coefficient, the contrast control parameters of the display screen are corrected to ensure that the updated contrast control parameters are consistent with the brightness output status of each display area within the current display cycle.

[0060] In one embodiment, after the brightness output adjustment range of each display area in adjacent display cycles meets the preset stability conditions, the system uniformly collects the actual brightness output state of the contrast adjustment area and the brightness constraint area in the current display cycle; wherein, the actual brightness output state includes the backlight output level and pixel brightness mapping result corresponding to each display area at the end of the current display cycle, thereby forming a regional brightness reference set for subsequent analysis.

[0061] After forming a regional brightness reference set, for the contrast adjustment region, the brightness level separation caused by brightness stretching in the current display cycle is analyzed. By comparing the grayscale distribution changes before and after brightness stretching, the contribution of brightness stretching to the changes in image level is evaluated. At the same time, for the brightness constraint region, the effect of its brightness-limited state on suppressing brightness fluctuations in adjacent display cycles is analyzed, and the constraint weight of the brightness-limited state in maintaining display stability is evaluated.

[0062] After obtaining the contribution level and constraint weight, a corresponding analysis is performed on the two to reflect the balance between the contrast enhancement requirement and the display stability requirement within the current display cycle. Based on this, a contrast adjustment coefficient is calculated to coordinate the mapping relationship between backlight output changes and pixel brightness, so that the contrast adjustment coefficient can simultaneously reflect the effectiveness of brightness level enhancement and the stability requirement of brightness constraint.

[0063] Finally, based on the contrast adjustment coefficient, the contrast control parameters of the display screen are corrected so that the updated contrast control parameters can maintain a consistent adjustment scale between backlight output adjustment and pixel brightness mapping in the next display cycle, thereby matching the contrast adjustment behavior with the brightness output state of each display area in the current display cycle.

[0064] The present invention also provides a dynamic contrast optimization system for a display screen, for performing the dynamic contrast optimization method for a display screen as described above, the dynamic contrast optimization system for a display screen comprising: The brightness distribution reference determination module 101 is used to obtain the brightness distribution state of the image to be displayed within the current display cycle of the display screen, and to collect the output backlight brightness range of the display screen to determine the brightness distribution reference of the image to be displayed on the display screen. The display partitioning module 102 is used to divide the display screen into multiple display partitions based on the brightness allocation benchmark, and calculate the brightness change load of each partition in combination with the brightness change requirements of each partition; and determine the contrast adjustment area and brightness constraint area based on the brightness change load of each partition and the carrying capacity of each partition for backlight changes and pixel brightness compensation. The output amplitude adjustment module 103 is used to limit the brightness output adjustment amplitude of each display area in adjacent display cycles according to the contrast adjustment area and the brightness constraint area when the displayed content changes. The contrast control parameter update module 104 is used to update the contrast control parameters of the display screen according to the brightness output status of the contrast adjustment area and the brightness constraint area in the current display cycle when the brightness output adjustment range of each display area meets the preset conditions.

[0065] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A method for optimizing dynamic contrast ratio of a display screen, characterized in that, Includes the following steps: Step S1: During the current display cycle of the display screen, obtain the brightness distribution state of the image to be displayed, and collect the output backlight brightness range of the display screen to determine the brightness distribution benchmark of the image to be displayed on the display screen. Step S2: Based on the brightness allocation benchmark, the display screen is divided into multiple display zones, and the brightness change load of each zone is calculated in combination with the brightness change requirements of each zone. Based on the load of brightness changes in each zone, and combined with the capacity of each zone to handle backlight changes and pixel brightness compensation, the contrast adjustment area and brightness constraint area are determined. Step S3: Based on the contrast adjustment area and the brightness constraint area, when the displayed content changes, limit the brightness output adjustment range of each display area in adjacent display cycles. Step S4: When the brightness output adjustment range of each display area meets the preset conditions, update the contrast control parameters of the display screen according to the brightness output status of the contrast adjustment area and the brightness constraint area in the current display cycle.

2. The method for optimizing dynamic contrast of a display screen according to claim 1, characterized in that, Step S2 includes: Based on the brightness allocation benchmark, the image to be displayed is divided into multiple display zones on the display screen according to the backlight controllable range and pixel driving structure; For each display zone, determine the deviation of the brightness distribution within the zone from the brightness allocation benchmark, and extract the brightness change requirements of the brightness variation amplitude and density of the display zone. Based on the brightness change requirements, calculate the brightness change load of each display zone within the current display cycle; By combining the load level of brightness changes in each display zone, the load capacity of the corresponding display zone during backlight output adjustment and pixel brightness compensation is analyzed. Based on the matching results of the load level and carrying capacity of the brightness change of each zone, the display zones that need to be intervened in contrast adjustment are determined as contrast adjustment areas, and the display zones that limit brightness changes to maintain display stability are determined as brightness constraint areas.

3. The method for optimizing dynamic contrast of a display screen according to claim 2, characterized in that, Based on the brightness allocation criteria, the image to be displayed is divided into multiple display zones on the screen according to the backlight controllable range and pixel driving structure, including: Based on the brightness allocation benchmark, the distribution of backlight areas in the display screen that can participate in brightness adjustment is identified, and the pixel drive coverage is determined. Based on the backlight area distribution and pixel drive coverage, mark the boundaries of the display area in the display screen; The screen to be displayed is divided into multiple display zones according to the boundaries of the display area.

4. The method for optimizing dynamic contrast of a display screen according to claim 3, characterized in that, Based on the backlight area distribution and pixel drive coverage, the boundaries of the display area in the display screen are marked as follows: Determine the spatial distribution area in the display screen where the backlight output participates in brightness adjustment based on the backlight area distribution; Determine the effective pixel response area within the pixel driver coverage area; The spatial distribution area involved in backlight adjustment is mapped to the effective pixel response area to determine the overlapping area; Along the edge of the overlapping area, identify the location where the consistency of backlight output change and pixel brightness response in brightness change in the display screen breaks, and use this location as the boundary of the display area.

5. The method for optimizing dynamic contrast of a display screen according to claim 2, characterized in that, For each display zone, determine the deviation of the brightness distribution within the zone from the brightness allocation benchmark, and extract the brightness variation requirements of the display zone's brightness variation amplitude and density, including: For each display zone, obtain the actual brightness distribution status of the display zone within the current display cycle; The actual brightness distribution of the display partition is compared with the brightness allocation reference to determine the deviation of the brightness distribution within the display partition from the brightness allocation reference. Based on the brightness deviation, the range of brightness variation from high to low within the display zone is analyzed and used as the brightness variation range; Based on the magnitude of brightness variation, the statistical display shows the regional distribution characteristics of concentrated brightness variations within the partition, thus obtaining the density characteristics of brightness variation. The brightness variation amplitude and the variation density characteristics are combined to form the brightness variation demand.

6. The method for optimizing dynamic contrast of a display screen according to claim 2, characterized in that, Based on the brightness variation requirements, the calculation of the brightness variation load of each display zone within the current display cycle includes: Based on the brightness change requirements, identify the distribution of display zones where brightness is stretched or compressed during contrast adjustment; Based on the regional distribution of brightness stretching or compression, analyze and display the overall span of brightness adjustment within the partition; Determine the distribution of brightness adjustment areas within the display partition and identify the concentrated distribution of brightness changes; Based on the overall span and distribution of brightness adjustments, assess the difficulty of adjusting the display zones when performing contrast adjustments. The adjustment difficulty is used as the load level of brightness change in each display zone during the current display cycle.

7. The method for dynamic contrast optimization of a display screen according to claim 6, characterized in that, Based on the load level of brightness changes in each display zone, the analysis of the load capacity of the corresponding display zone during backlight output adjustment and pixel brightness compensation processes includes: Based on the load level of brightness changes in each display zone, extract the corresponding backlight brightness adjustment range of the display zone during contrast adjustment. Within the backlight brightness adjustment range, analyze the response status of pixel brightness compensation in the display partition; Based on the response status of pixel brightness compensation, evaluate the degree of coordination between backlight brightness adjustment and pixel brightness compensation within the display zone; Based on the degree of coordination and matching, the analysis shows the stable load-bearing capacity of the display partition under the combined effect of backlight output adjustment and pixel brightness compensation.

8. The method for optimizing dynamic contrast of a display screen according to claim 1, characterized in that, Step S3 includes: When the displayed content changes, the brightness output state of the contrast adjustment area and the brightness constraint area in the current display cycle is obtained as the cycle start brightness state of the corresponding display area. Based on the initial brightness state of the cycle, the direction and magnitude of brightness change of each display area in adjacent display cycles are tracked to form a brightness evolution trajectory; Based on the brightness evolution trajectory, the contrast adjustment area relaxes the boundary of brightness variation range according to the display layer enhancement requirements; The brightness constraint area synchronously restricts the magnitude of brightness changes, suppressing the abrupt trend of brightness changes in adjacent display cycles; Based on the simultaneous relaxation and restriction, the brightness variation range of the contrast adjustment area and the brightness constraint area is coordinated and adjusted to maintain it within the brightness range that the display area can stably display, and the brightness range is used as the brightness output adjustment range of the corresponding display area in adjacent display cycles.

9. The method for optimizing dynamic contrast of a display screen according to claim 8, characterized in that, Based on the brightness evolution trajectory, the contrast adjustment area is widened to relax the brightness variation boundary according to the display layer enhancement requirements, including: Based on the brightness evolution trajectory, identify the main evolution direction of brightness change in the contrast adjustment area within adjacent display cycles; Analyze the brightness variation segments in the contrast adjustment region that contribute significantly to the display hierarchy along the evolution direction; Assess the margin of brightness variation that the brightness variation segment can withstand during a continuous display cycle; Based on the brightness variation margin, the boundary of the brightness variation range of the contrast adjustment area within adjacent display cycles is broadened in stages.

10. A dynamic contrast optimization system for a display screen, characterized in that, For performing the dynamic contrast optimization method for a display screen as described in claim 1, the dynamic contrast optimization system for a display screen includes: The brightness distribution reference determination module is used to obtain the brightness distribution status of the image to be displayed within the current display cycle of the display screen, and to collect the output backlight brightness range of the display screen to determine the brightness distribution reference of the image to be displayed on the display screen. The display partitioning module is used to divide the display screen into multiple display partitions based on the brightness allocation benchmark, and calculate the brightness change load of each partition in combination with the brightness change requirements of each partition; based on the brightness change load of each partition, and in combination with the capacity of each partition to handle backlight changes and pixel brightness compensation, the contrast adjustment area and brightness constraint area are determined. The output amplitude adjustment module is used to limit the brightness output adjustment amplitude of each display area in adjacent display cycles when the displayed content changes, based on the contrast adjustment area and the brightness constraint area. The contrast control parameter update module is used to update the contrast control parameters of the display screen according to the brightness output status of the contrast adjustment area and the brightness constraint area in the current display cycle when the brightness output adjustment range of each display area meets the preset conditions.

Images