Environment perception based liquid crystal screen comfort degree dimming method and system

Abstract

This invention discloses a method and system for comfort dimming of a liquid crystal display (LCD) screen based on environmental perception, belonging to the field of LCD display terminal technology. The method includes the following steps: generating a confident environmental reference by performing environmental perception correction and pseudo-environment component removal on environmental observation results; generating a comprehensive color reference, a comprehensive color transition reference state, and a coordinated comfort target based on the confident environmental reference; and achieving coordinated adjustment of brightness and white point through observation locking, pre-adaptation, coordinated convergence maintenance, comprehensive evaluation, and bidirectional correction. This scheme improves the accuracy of environmental reference, dimming continuity, and coordinated stability, solving the problems of distorted environmental observation, abrupt dimming changes, and lack of coordination between brightness and white point in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal display terminal technology, and in particular to a method and system for adjusting the dimming of liquid crystal displays based on environmental perception. Background Technology

[0002] In applications such as automotive displays, smart cockpits, tablet terminals, smart TVs, and industrial control display equipment, LCD display terminals typically require adjustments to parameters such as screen brightness, white point, or color temperature based on changes in ambient light, usage time, and display tasks to improve display visibility, visual comfort, and information recognition. Existing LCD dimming technologies fall into two main categories: one focuses on establishing a backlight drive curve, obtaining a backlight dimming curve suitable for a specific mode by pre-setting the correspondence between current values, PWM (Pulse Width Modulation) values, and target optical indicators; the other focuses more on hardware drive circuits, controlling the voltage or current of white and colored LED groups separately to adjust parameters such as brightness, color temperature, color coordinates, and spectral radiance.

[0003] For example, the invention patent with publication number CN117765886A discloses a method for obtaining the backlight dimming curve of an LCD screen that meets night vision compatibility requirements, including: Step 1, determining the preset current value of each colored light at its maximum and minimum brightness; Step 2, measuring the PWM value corresponding to each colored light at its maximum, intermediate, and minimum brightness; Step 3, obtaining the night mode quadratic function curve of each colored light based on the three sets of brightness and the corresponding PWM value; Step 4, lighting up the colored lights based on the night mode quadratic function curve, and detecting whether the radiance and color coordinates of the mixed light meet the preset requirements; if they meet the requirements, proceed to Step 5; if they do not meet the requirements, proceed to Step 6; Step 5, using the night mode quadratic function curve as the backlight dimming curve of the LCD screen in night mode; Step 6, modifying the preset current value, and proceeding to Step 2 again.

[0004] For example, Chinese utility model patent CN216980096U discloses a fast dimming circuit and a backlight device for an LCD screen. A white lamp group control circuit is formed by connecting a microprocessor, a high-current constant current device, and a white lamp group to control the voltage of the white lamp group and adjust its brightness. A colored lamp group control circuit is formed by connecting a microprocessor, a low-current constant current device, a switching circuit, and a colored lamp group. The outputs of the low-current constant current device and the switching circuit are respectively connected to the colored lamp group. The colored lamp group control circuit is used to control the voltage of the colored lamp group to adjust its brightness and to control its current to adjust its color temperature, color coordinates, and spectral radiance.

[0005] However, in the process of implementing the inventive technical solution in the embodiments of this application, it was found that the above-mentioned technology has at least the following technical problems: Current LCD screen comfort dimming solutions typically rely directly on ambient illuminance or overall ambient color results collected by environmental sensors for subsequent brightness and white point adjustments. However, in practical applications, the output of environmental sensors is easily affected by factors such as screen light emission, cover glass reflection, and side-incident light, causing discrepancies between the sensor's environmental observations and the actual external environment. Generating a dimming baseline based on distorted environmental observations can lead to subsequent brightness and white point adjustments deviating from actual environmental requirements, thus affecting dimming accuracy and display comfort.

[0006] Furthermore, existing dimming solutions typically adjust directly based on current environmental values, target values, or output values, lacking an intermediate reference mechanism for a continuous transition from the current state to the target state. When environmental changes, content switching, or fluctuations in the current screen output status information occur, the system tends to rapidly adjust towards the new target, leading to sudden changes in brightness, white point abruptly, and discontinuous changes in the overall color state, thereby affecting display stability and user visual comfort.

[0007] Furthermore, in existing LCD screen dimming controls, brightness adjustment and white point adjustment often employ relatively independent control methods, lacking a collaborative mechanism for overall color continuity. In complex scenarios, if the pace of brightness and white point adjustments is inconsistent, the order is unreasonable, or frequent reversals and replanning occur during adjustment, it can easily lead to inconsistent overall color performance, making it difficult to balance environmental adaptability, display readability, and adjustment stability, thus affecting the comfortable dimming effect of the LCD screen in various scenarios. Summary of the Invention

[0008] To address the problems in existing LCD screen dimming processes, such as distorted environmental observation results due to screen light emission, cover plate reflection, and side-incident light, lack of continuous transition references for brightness and white point adjustments, insufficient coordination between the two, and susceptibility to abrupt changes and inconsistencies, this invention provides an environment-aware LCD screen comfort dimming method for LCD display terminals. The method includes the following steps: acquiring scene-related input information for dimming decisions in each control cycle; performing environment-aware correction and pseudo-environment component removal on the raw observation results output by the environmental sensor, and generating a confidence environment benchmark for the current control cycle; and generating a comprehensive color benchmark for the current control cycle based on the confidence environment benchmark, content information, and current screen output state information, and further recursively calculating the comprehensive color transition parameters. The system assesses the current state; based on the confidence environment benchmark, content information, time period information, and current display configuration parameters, it generates a collaborative comfort target for the current scene; it calculates the collaborative adaptation difference between the collaborative comfort target and the comprehensive color transition reference state; it enters the observation and locking phase based on the collaborative adaptation difference; when the observation and locking phase confirms that a new scene trend has formed and that the collaborative adaptation difference of the current control cycle has persistence and effectiveness, it enters the pre-adaptation phase; when it is confirmed that the current output has begun to converge towards the collaborative comfort target of the current round along the direction established in the pre-adaptation phase, it enters the collaborative convergence maintenance phase; after completing one round of collaborative adjustment, it comprehensively evaluates and bidirectionally corrects the adjustment effect of the current round, and based on the comprehensive evaluation results, it corrects the subsequent dimming strategy and performs reverse correction on the front-end environment perception link.

[0009] Another aspect of the present invention provides an environment-aware LCD screen comfort dimming system, applied to an environment-aware LCD screen comfort dimming method, comprising: a scene perception and environment benchmark generation module, used to acquire scene-related input information, and perform environment perception correction and pseudo-environment component stripping on the raw observation results output by the environment sensor to generate a confidence environment benchmark for the current control cycle; a reference state and target generation module, used to generate a comprehensive color benchmark for the current control cycle based on the confidence environment benchmark, content information, and current screen output state information, and recursively calculate a comprehensive color transition reference state, and generate a cooperative comfort target for the current scene based on the confidence environment benchmark, display content information, time period information, and current display configuration parameters; a cooperative adjustment control module, used to calculate a cooperative adaptation difference based on the relationship between the cooperative comfort target and the comprehensive color transition reference state, and perform observation locking, pre-adaptation advancement, and cooperative convergence maintenance control based on the cooperative adaptation difference to adjust the LCD screen output towards the cooperative comfort target; and an evaluation and correction module, used to comprehensively evaluate the adjustment effect of the current round after completing a round of cooperative adjustment, and perform correction on subsequent dimming strategies and environment perception parameters based on the evaluation results.

[0010] The beneficial effects of the technical solution provided in this application embodiment include at least the following: By implementing an environmental perception correction and pseudo-environment component removal mechanism, additional observational components introduced by screen output, cover plate reflection, and side-incident light are removed from the original environmental sensor observations. This is then combined with the environmental perception confidence value to generate a confident environmental baseline. Consequently, subsequent brightness and white point adjustments are no longer directly based on uncorrected original environmental observations, thus improving the accuracy and reliability of environmental input and providing a more reliable environmental reference basis for subsequent comfortable dimming.

[0011] By introducing a comprehensive color transition reference state and calculating the co-adaptive difference based on it, the system no longer directly chases brightness and white point rapidly based on the current target value. Instead, it judges the actual adjustment needs of the current cycle around the continuous transition position. As a result, it can effectively suppress sudden changes in brightness, white point, and violations of comprehensive color continuity under environmental changes, content switching, or output fluctuations, thereby improving the continuity and stability of the dimming process.

[0012] By constructing a closed-loop collaborative control mechanism encompassing observation and locking, pre-adaptive advancement, coordinated convergence and maintenance, and bidirectional correction, brightness and white point are no longer simply acted as independent adjustment variables, but rather coordinated at the comprehensive color level. This allows for the rational determination of the dominant adjustment method, advancement rhythm, and relative relationship based on environmental changes, content characteristics, and display requirements in different scenarios, reducing oscillations, reversals, and replanning phenomena, and improving the stability, coordination, and environmental adaptability of LCD screens in comfortable dimming under complex scenarios. Attached Figure Description

[0013] Figure 1 A flowchart illustrating a method for adjusting the dimming comfort of a liquid crystal display screen based on environmental perception, provided in an embodiment of this application; Figure 2 The flowchart for environmental perception credibility correction and pseudo-environment component stripping provided in Embodiment 1 of this application; Figure 3 This is a flowchart of the method for forming a long-term coordinated rhythm template and an environmental modification template provided in Embodiment 2 of this application; Figure 4 This is a schematic diagram of a comfort dimming system for an LCD screen based on environmental perception, provided in an embodiment of this application. Detailed Implementation

[0014] This application provides an environment-aware LCD screen comfort dimming method and system, primarily addressing the problems in existing LCD screen dimming processes, such as distorted environmental observation results due to screen light emission, cover plate reflection, and side-incident light, lack of continuous transition references for brightness and white point adjustment, insufficient coordination between the two, and susceptibility to abrupt changes and inconsistencies. It proposes a dimming scheme oriented towards environmental correction, continuous transition, and coordinated control. Specifically, the LCD display terminal first performs environment-aware correction and pseudo-environment component removal on the environmental observation results to generate a confident environmental reference. Then, based on the confident environmental reference, it generates a comprehensive color reference and a comprehensive color transition reference state, and further generates a coordinated comfort target. Subsequently, it calculates the coordinated adaptation difference based on the coordinated comfort target and the comprehensive color transition reference state, and sequentially performs observation locking, pre-adaptation advancement, coordinated convergence maintenance, comprehensive evaluation, and bidirectional correction according to the coordinated adaptation difference, thereby achieving coordinated adjustment of brightness and white point. This scheme improves the accuracy of environmental references, dimming continuity, and comprehensive color coordination. To better understand the above technical solution, the following will provide a detailed description of the technical solution in conjunction with the accompanying drawings and specific implementation methods.

[0015] Example 1: This example provides a method for comfort dimming of an LCD screen based on environmental perception, applied to an LCD display terminal with environmental information acquisition capabilities, display content analysis capabilities, and a display control interface. For example... Figure 1 As shown, after the LCD display terminal obtains scene-related input information, it sequentially performs environmental perception correction and pseudo-environment component stripping, comprehensive color benchmark generation, comprehensive color transition reference state recursion, cooperative comfort target generation, and cooperative adjustment control. Based on the cooperative adaptation difference between the cooperative comfort target and the comprehensive color transition reference state, it enters the observation and locking stage. After confirming that the scene trend is stable, it performs pre-adaptation advancement and cooperative convergence maintenance, and finally outputs the evaluation results for subsequent correction.

[0016] For ease of explanation, the term "comprehensive color" in the following text refers to the color formed by the combined effects of the luminance and white point dimensions. "Comprehensive color reference" represents the baseline state that the luminance and white point dimensions should reach in the current scene. "Comprehensive color transition reference state" represents the position that the luminance and white point dimensions have continuously advanced to within the current control cycle. "Cooperative comfort target" represents the comprehensive color adjustment target expected to be achieved in the current round. "Cooperative adaptation difference" represents the degree of deviation of the cooperative comfort target from the comprehensive color transition reference state. The original observation results from the environmental sensors are denoted as X. raw When only two environmental observation components, illuminance and composite color, are used, X(t) can be expressed as X. raw (t)=[E raw (t), C raw(t)]. Where t represents the control cycle number corresponding to the LCD display terminal executing control according to the preset dimming rhythm. To facilitate a unified description of the brightness dimension and the white point dimension, the following uses the brightness dimension control quantity B(t) and the white point dimension control quantity W(t) to represent the output state in the unified control domain. Both are preferably mapped to the preset normalized interval [0, 1] or the corresponding device-allowed control interval, and are converted into backlight driving parameters and white point driving parameters respectively during actual execution.

[0017] The LCD display terminal acquires scene-related input information for dimming decisions in each control cycle. When multiple consecutive control cycles perform adjustments around the same collaborative comfort goal, this continuous adjustment process is recorded as the current cycle. Scene-related input information includes dynamic input information and preset parameter information.

[0018] Dynamic input information includes at least environmental information, content information, current screen output status information, time period information and current display configuration parameters, reference environmental information, and interactive operation information. Among these, environmental information includes at least the original ambient illuminance value E. raw (t) and the overall color result of the original environment C raw (t), and may further include the environmental illuminance change trend V obtained based on environmental illuminance sequences of multiple consecutive control periods. E (t) and initial environmental stability S E (t). Among them, E raw (t) is used to characterize the current ambient brightness level, C raw (t) is used to characterize the comprehensive color features of the current ambient light in the comprehensive color dimension, preferably represented by comprehensive color coordinates, comprehensive color temperature, or equivalent white point representation; C raw (t) is mainly used for the generation of subsequent white point benchmarks, cooperative comfort targets, and comprehensive color correlation states, E raw (t) is mainly used for the generation of subsequent luminance references and luminance-related states. V E (t) is preferably represented by the moving average of the illuminance difference between adjacent periods, S E (t) It is preferable to use the normalized result of the illuminance fluctuation amplitude, variance or range within the preset window.

[0019] The content information should at least include the brightness characteristic L of the displayed content. c (t), percentage of neutral color areas N c (t), Content Type T c (t), Information display priority parameter P c (t), Sensor neighborhood content characteristics L n (t) and the brightness distribution characteristics of the screen edge area L e (t). Wherein, the information display priority parameter Pc (t) is determined by the interface element category, display area position, area ratio, local contrast ratio, and alarm flags; the LCD display terminal first maps the interface element category, display area position, and alarm flags to category scores according to a preset mapping table, and maps the area ratio and local contrast ratio to numerical scores. Then, it weights and sums each score according to a preset weight and normalizes it to obtain P. c (t); where, the more important the interface element category, the closer the display area is to the main display area, the larger the area ratio, and the higher the alarm flag level, the higher the corresponding score; the lower the local contrast, the higher the corresponding score. Sensor neighboring area content characteristics L n (t) represents the combined feature quantity extracted within the projection area of ​​the environmental sensor's field of view, preferably including at least the average brightness of the neighboring area, the proportion of high brightness in the neighboring area, and the average value of the comprehensive color characterization of the neighboring area; the LCD display terminal first determines the projection area of ​​the environmental sensor's field of view on the screen, and then calculates the average brightness of all pixels in that area, the proportion of pixels exceeding the preset high brightness threshold, and the average value of the equivalent white point characterization, as L. n (t) is a component of the brightness distribution characteristics of the screen edge region. e (t) represents the combined feature quantity extracted within a preset width range of the screen edge, preferably including at least the average brightness of the edge region, the proportion of high brightness in the edge region, and the brightness gradient of the edge region; the LCD display terminal first determines the preset width range of the screen edge, and then calculates the average brightness of all pixels within this range, the proportion of pixels exceeding the preset high brightness threshold, and the brightness change rate between adjacent edge sampling positions, as L. e (t) is a component of (t).

[0020] The current screen output status information includes at least the current brightness output value B. out (t), Current white point output value W out (t), Current adjustment status indicator S adj (t) and the most recently output direction reversal flag F rev (t).

[0021] The time period and the current display configuration parameters must include at least the current time period identifier T. s (t), Current display mode identifier M d (t) and the set of adjustment boundary parameters L bd (t). Wherein, the set of adjustment boundary parameters L bd (t) includes at least the allowable control range of the luminance dimension, the allowable control range of the white point dimension, the maximum change in luminance per cycle, and the maximum change in white point per cycle.

[0022] Reference environmental information should include at least the auxiliary environmental result X. aux (t) and historical environmental results Xhist (t). Among them, the auxiliary environment result X aux (t) refers to the environmental reference result obtained by the auxiliary environmental sensor, which is used for cross-validation or deviation comparison with the current corrected environmental result; the LCD display terminal reads the auxiliary environmental illuminance value E output by the auxiliary environmental sensor within the current control cycle. aux (t) and the comprehensive color result of the auxiliary environment C aux (t), and form X aux (t)=[E aux (t),C aux (t)].

[0023] The interactive operation information includes at least the manual adjustment indicator, the manual adjustment direction, the manual adjustment range, and the time when the manual adjustment occurred. The interactive operation information is an optional enhanced input.

[0024] The preset parameter information includes at least the optical structure parameter θ, the spectral correction parameter Γ, the additional observation increment calibration parameter Λ, and the default safety environment template parameter X. safe Among them, Γ is preferably represented by a spectral correction matrix or a spectral correction lookup table, Λ is preferably represented by an additional observation increment lookup table, a set of fitting coefficients, or a set of piecewise mapping parameters, and X... safe Ideally, it should include at least a default ambient illuminance reference and a default ambient comprehensive color reference.

[0025] After acquiring the above input information, the LCD display terminal performs a validity determination on each input item in each control cycle, and generates a subsequent input sufficiency coefficient Q based on the determination result. in (t). Validity determination includes at least accessibility determination, timeliness determination, completeness determination, sample size determination, and outlier determination.

[0026] The availability determination is used to judge whether the corresponding input item successfully returns valid data within the current control cycle. If the corresponding input source returns non-empty data within the current control cycle, and the data is not an invalid placeholder value, default error code, communication failure flag, or read timeout flag, the availability is determined to be successful; otherwise, the availability is determined to be unsuccessful.

[0027] The timeliness determination is used to determine whether the corresponding input item is still within the preset valid time window. The LCD display terminal reads the acquisition timestamp of the corresponding input item and calculates the time difference between the current control cycle time and the acquisition timestamp. When the time difference is less than or equal to the maximum allowable delay corresponding to the input item, the timeliness is determined to be passed; otherwise, the timeliness is determined to be failed. The maximum allowable delay is preset according to the type of input item. The maximum allowable delay for ambient illuminance, ambient comprehensive color result, current brightness output value, and current white point output value is preferably no greater than 1 control cycle. The maximum allowable delay for content analysis results is preferably no greater than the larger of 1 display refresh cycle and 1 control cycle. The maximum allowable delay for auxiliary environmental results and historically retained environmental results is preferably no greater than the preset reference window length.

[0028] Completeness determination is used to judge whether the corresponding input item is missing necessary fields, missing labels, or missing key features. Necessary fields refer to data fields that are essential for completing the semantic expression of the current input item; missing labels mean that the corresponding input item lacks preset identification information used to determine its category, status, source, or processing path; key features refer to features that are directly called by subsequent calculation steps within the current control cycle, and whose absence would cause the corresponding step to fail, fail to obtain effective output results, or require entering an alternative estimation mode. The LCD display terminal pre-establishes necessary field sets and key feature sets for different types of input items and checks their completeness and validity item by item; when a corresponding field is not successfully obtained, the field is empty, the value is invalid, the label is missing, or it is inconsistent with the preset field format, value type, or encoding rule, the corresponding field or feature is determined to be missing. For environmental information, current screen output status information, content information, time period, and current display configuration parameters, the necessary field set is preferably composed of the basic fields of the corresponding input items in the aforementioned scenario-related input information; the key feature set is determined according to the calculation steps actually required to be executed in the current control cycle. If any necessary field, any necessary label, or any key feature in the set of key features required for the current control cycle is missing, the completeness is deemed to fail. For optional enhanced inputs such as interactive operation information, if there are no user operation events in the current control cycle, it can be recorded as a no-event state instead of being directly judged as a completeness failure.

[0029] The sample size determination is used to determine whether the corresponding input item meets the minimum sample size required for trend calculation, stability calculation, or statistical processing. The LCD screen terminal counts the number of valid samples N for the input item within a preset statistical window. eff And compare it with the minimum number of samples N required for the corresponding processing task. min Comparison, when N eff ≥N min If the sample size is within the acceptable range, then the sample size is considered acceptable; otherwise, the sample size is considered unacceptable. Where N... minPre-set according to the specific calculation task. For example, when performing an environmental illuminance change trend calculation, N min Preferably not less than 3; when performing initial environmental stability calculations, N min Preferably not less than 5; when performing calculations of moving average, moving variance, or window range, N min The preferred value is equal to the corresponding statistical window length.

[0030] Anomaly detection is used to determine whether a corresponding input item has an abnormal observation value that exceeds a preset physical range, has an abnormal single-cycle variation amplitude, or exceeds a preset difference threshold with an adjacent cycle and persists for N control cycles. The preset physical range is pre-set based on the sensor range, display drive range, structural calibration results, and the equipment's allowable operating range. When an input value is less than the lower physical limit or greater than the upper physical limit, it is determined to exceed the preset physical range. The method for determining abnormal single-cycle variation amplitude is: calculate the absolute value of the difference between the current control cycle's input value and the corresponding input value of the previous control cycle; when this absolute value is greater than the threshold value of the previous control cycle's input value, the abnormal value is determined. When the maximum permissible single-cycle change of the input item is reached, it is determined to be an abnormal change amplitude. The maximum permissible single-cycle change is preset based on the sampling period, the upper limit of the physical change rate of the input item, and the factory calibration results. The method for determining adjacent cycle mismatch is as follows: calculate the difference between the input value of the current control cycle and the input value of the previous control cycle. When the absolute value of the difference exceeds the preset difference threshold of the corresponding input item, and this state continues for N control cycles, it is determined that there is an abnormal mismatch between adjacent cycles. Among them, the preset difference threshold is set according to the type of input item, and N is the preset number of consecutive abnormal judgment cycles, preferably 2 or 3.

[0031] The aforementioned set of necessary fields, maximum allowable delay, minimum number of samples, upper and lower limits of physical range, maximum allowable single-cycle change, preset difference threshold, and number of consecutive anomaly judgment cycles N can all be preset based on the sensor sampling cycle, display refresh cycle, LCD screen display terminal output update cycle, device range, and factory calibration results, and remain fixed within the same LCD screen display terminal or switch according to preset modes.

[0032] Based on this, the LCD display terminal calculates the input sufficiency coefficient Q for the current control cycle. in (t). Each input item includes at least ambient illuminance, ambient comprehensive color result, current brightness output value, current white point output value, and content type. The LCD display terminal first maps the availability, timeliness, completeness, sample size, and outlier determination results of each input item to corresponding validity scores. A preset high score is used when the determination passes, a preset low score is used when the determination fails, and a preset intermediate score is used when there are minor anomalies or when caution is required. Then, a weighted sum is calculated based on preset weights and normalized to obtain Q. in(t). The threshold values ​​for normal calculation mode and degradation control mode are preferably set in tiers based on historical calibration samples or preset operating experience. Subsequently, the LCD display terminal displays the data according to Q... in (t) The current state is divided into normal calculation mode, alternative estimation mode, and degraded control mode. These three modes are calculated according to Q. in (t) Triggered sequentially from high to low.

[0033] When Q in (t) When the preset high threshold is reached, and the availability, timeliness and outlier determination of key input items are all passed, the LCD display terminal enters the normal calculation mode and executes the complete environmental perception correction, comprehensive color transition reference state estimation, collaborative comfort target generation and subsequent dimming control process.

[0034] When Q in (t) When the input value is below the normal calculation mode threshold but not below the preset low threshold, and there is no situation where key input items fail for multiple consecutive control cycles, the LCD display terminal enters the alternative estimation mode. In this mode, the LCD display terminal can use historical valid values, sliding window statistics, associated input mapping values, or default conservative values ​​to compensate for missing or unreliable inputs before performing subsequent calculations. Among them, the associated input mapping value is calculated from the available inputs based on the preset associated mapping table.

[0035] When Q in (t) When the input value is below a preset low threshold, or when any key input item fails to achieve availability, timeliness, or outlier determination for N consecutive control cycles, the LCD display terminal enters a degraded control mode. In this mode, the LCD display terminal preferably freezes some control components, reduces the single-cycle change, prohibits dual-leader collaboration, or directly calls the default template to ensure that the system can still maintain basic stable operation when input conditions are insufficient.

[0036] like Figure 2 As shown, after obtaining the current state mode, the LCD display terminal performs environmental perception correction and pseudo-environment component removal on the raw observation results of the environmental sensor to generate the confidence environmental benchmark for the current round. Specifically, the environmental perception correction is used to adjust the raw environmental illuminance value E. raw (t) and the overall color result of the original environment C raw (t) is corrected, and pseudo-environment component stripping is used to remove additional observational components of the non-real environment introduced by screen output, cover plate reflection and side-incident light.

[0037] Specifically, the LCD display terminal first acquires the raw observation results X from the environmental sensor. raw (t), at the same time, the LCD screen display terminal reads B out (t), W out (t), L n(t), L e (t) and θ, Γ, Λ. Subsequently, the LCD display terminal calculates the additional observation increment for the current control cycle based on the current brightness output value, the current white point output value, the content characteristics of the sensor's adjacent area, the brightness distribution characteristics of the screen edge area, and the preset structure and calibration parameters. The additional observation increment refers to the incremental part introduced into the environmental sensor observation results by the display terminal's own output and structural coupling effect within the current control cycle, used to characterize the pseudo-environment component added to the original environmental observation results relative to the real external environmental state. The additional observation increment includes at least the illuminance dimension additional observation increment ΔE. p (t) and the additional observation increment ΔC of the comprehensive color dimension p (t), which can be represented as: ; Where, ΔE p (t) is used to characterize the additional observations introduced in the illuminance dimension by light emitted from the screen itself, reflections from the cover plate, and side-incident stray light, ΔC p (t) is used to characterize the additional observations introduced in the overall color dimension by light emitted from the screen itself, reflection from the cover plate, and side-incident stray light; f E (∙) represents the function for calculating the additional observation increment in the illuminance dimension, f C (∙) represents the function for calculating the additional observation increment of the comprehensive color dimension. E (∙) Preferably, it is implemented in the following manner: First, extract the average brightness and high brightness ratio in the area near the sensor, and extract the average brightness and high brightness ratio at the edge of the screen. Then, combine the current brightness output level and structural calibration parameters, and obtain the direct light output component, cover plate reflection component, and side-incident light component respectively through a preset two-dimensional or three-dimensional lookup table. Finally, sum the three to obtain ΔE. p (t); f C (∙) Preferably, it is implemented in the following manner: First, extract the comprehensive colorimetric values ​​of the sensor's neighboring area and the edge area. Then, combine the current white point output level and structural calibration parameters, obtain the direct light emission offset component, reflection offset component, and side-entry offset component through a preset lookup table, and sum the three to obtain ΔC. p (t).

[0038] The LCD display terminal separates the additional observation increments from the original observation results to obtain preliminary corrected environmental results, including E. pre (t) represents the initial corrected ambient illuminance value, C pre (t) represents the preliminary corrected environmental color result, which can be expressed as: ; Subsequently, the LCD display terminal further performs spectral correction on the preliminary corrected environmental results based on the spectral correction parameter Γ, obtaining the corrected environmental illuminance value E.cor (t) and the corrected environmental color result C cor (t). During the operation phase, the LCD display terminal first reads the preliminary correction environment result E. pre (t) and C pre (t), and then according to C pre (t) Based on the corresponding comprehensive color characterization state, the current channel ratio characteristics of the environmental sensor, or the preset spectral category determination rule, determine the spectral correction interval to which the current preliminary corrected environmental result belongs; subsequently, read the correction parameter group corresponding to this spectral correction interval from the spectral correction parameter Γ, and apply it to E. pre (t) and C pre (t) Perform corrections separately to obtain E cor (t) and C cor (t). When E pre (t) or C pre (t) When it falls between two adjacent correction intervals, the LCD display terminal interpolates the two adjacent correction parameter groups according to the preset interpolation rules before performing correction; under the same input conditions, the same spectral correction interval, and the same spectral correction parameters, E cor (t) and C cor The output of (t) is uniquely determined, thus ensuring the objectivity and reproducibility of the spectral correction process. To ensure the validity of the results, the LCD display terminal also performs boundary constraints and single-cycle limiting processing on the correction results, ensuring that the corrected ambient illuminance value is not lower than a preset lower limit, the corrected comprehensive environmental color result is within a preset effective range, and the change in the current cycle correction result relative to the previous effective environmental result does not exceed a preset maximum correction range. The preset effective range and maximum correction range are preferably preset based on the range of the environmental sensor, the allowable range of the comprehensive color characterization space, and the maximum reasonable environmental change corresponding to the control cycle of the LCD display terminal.

[0039] In obtaining E cor (t) and C cor After (t), the LCD display terminal further calculates the environmental perception reliability value Q for the current control cycle. env (t). The LCD display terminal calculates the residual correlation evaluation quantity, consistency evaluation quantity, and physical constraint effectiveness evaluation quantity, respectively, and then sums them according to preset weights to obtain Q. env (t).

[0040] The residual correlation evaluation metric is used to characterize whether there is still residual coupling between the corrected environmental result and the current screen output. Within the most recent M effective control cycles, the LCD display terminal calculates the absolute correlation between the corrected environmental illuminance sequence and the brightness output sequence, and the absolute correlation between the corrected environmental comprehensive color sequence and the white point output sequence, respectively. It also counts the number of synchronous changes where the direction of change of the corrected environment is consistent with the direction of change of the output and the amount of change exceeds the corresponding preset difference threshold. When the correlation and the number of synchronous changes do not exceed the preset first threshold, the residual correlation evaluation metric is judged to be high. When any indicator is between the preset first threshold and the preset second threshold, it is judged to be medium. When any indicator exceeds the preset second threshold, it is judged to be low. The consistency evaluation metric is used to characterize the degree of consistency between the corrected environmental results and the reference environmental results. The LCD display terminal calculates the deviation between the current corrected environmental results and the auxiliary environmental results, the historically maintained environmental results, and the most recently valid environmental cache results, and compares them with the corresponding preset deviation thresholds. When none of the deviations is greater than the preset first deviation threshold, the consistency evaluation metric is judged as high; when any deviation is between the preset first deviation threshold and the preset second deviation threshold, it is judged as medium; and when any deviation is greater than the preset second deviation threshold, it is judged as low. The physical constraint validity evaluation metric is used to characterize whether the corrected environmental results meet the preset physical constraint conditions. The LCD display terminal checks at least the following conditions: E cor (t) Whether it is non-negative, C cor (t) Whether it is within the preset effective range, and whether the change in the current control cycle relative to the previous effective environmental result does not exceed the preset maximum correction range; when all the above conditions are met, the physical constraint effectiveness evaluation quantity is judged as high; when only a slight exceedance occurs, it is judged as medium; when a negative value, out-of-bounds, or sudden exceedance occurs, it is judged as low. Preferably, the LCD display terminal converts the above three evaluation quantities into normalized scores in the interval [0, 1] through a preset mapping table, and performs weighted summation according to preset weights to obtain the basic environmental perception credibility value.

[0041] When the preceding control cycle feedback results output by the comprehensive evaluation module (described later) are available, the LCD display terminal further corrects the basic environment perception reliability value based on feedback results such as output oscillation, replanning, direction reversal, and comprehensive color continuity violation. Specifically, the LCD display terminal counts the occurrence of the above feedback events within the most recent P control cycles; when the number of output oscillations exceeds a preset oscillation threshold, and the absolute correlation between the current corrected environment result and the current output sequence is still higher than a preset correlation threshold, the basic environment perception reliability value is lowered by a preset oscillation correction amount; when the number of replanning exceeds a preset threshold, and the current corrected environment result is inconsistent with the direction of the auxiliary environment result or the historically maintained environment result, the basic environment perception reliability value is lowered by a preset replanning correction amount; when the output direction is reversed, and the corrected environment result synchronously reverses direction within K consecutive control cycles, and this direction reversal is not supported by the auxiliary environment result, the basic environment perception reliability value is lowered by a preset reversal correction amount; when the comprehensive color continuity violation reaches a preset level, and the current C cor (t) When the change in the comprehensive color result relative to the previous effective environment exceeds the preset comprehensive color change threshold, the basic environment perception confidence value is lowered by the preset comprehensive color correction amount. The LCD display terminal sums up the above correction amounts to obtain the total correction amount, and subtracts it from the basic environment perception confidence value to obtain the final environment perception confidence value Q. env (t); When the corrected result exceeds the preset range, upper and lower limit constraints are applied to it.

[0042] After obtaining Q env After (t), the LCD display terminal performs a weighted fusion of the current corrected environment result, the historical retained environment result, and the default safe environment template to generate the confidence environment benchmark X for the current round. conf (t), which can be represented as: ; Among them, X cor (t)=[E cor (t), C cor [(t)],X hist (t)=[E hist (t), C hist [(t)],X safe =[E safe C safe ], where α(t), β(t), and γ(t) are fusion weights that adaptively change with confidence level and satisfy α(t) + β(t) + γ(t) = 1. The LCD display terminal pre-establishes a weight mapping rule table and uses the environmental perception confidence level, input sufficiency level, and historical retention environmental result validity as input conditions to output the corresponding initial weights α0, β0, and γ0. Specifically, the LCD display terminal first sets Q env(t) Compared with the preset credibility grading threshold, the credibility of environmental perception is divided into three levels: high, medium, and low; then Q is... in The input sufficiency is compared with the preset sufficiency classification threshold (t) to classify it into three levels: high, medium, and low. Simultaneously, it is determined whether the historical retention environment results are valid within the current control period. Subsequently, the corresponding initial weights α0, β0, and γ0 are read from the preset weight mapping rule table; the initial weights for different combinations are uniquely determined by the preset mapping rule table. After reading the initial weights, the LCD display terminal performs normalization processing on α0, β0, and γ0 to obtain the final fused weights α(t), β(t), and γ(t). Under the conditions of the same confidence level, the same input sufficiency level, the same historical result validity status, and the same mapping rule table, the values ​​of α(t), β(t), and γ(t) are uniquely determined.

[0043] After obtaining the confidence environment reference for the current control cycle, the LCD display terminal does not directly use it as the basis for immediate control. Instead, it combines the content information and the current screen output status information of the current control cycle to first generate the comprehensive color reference for the current control cycle, and then recursively calculates the comprehensive color transition reference state based on this.

[0044] Specifically, the LCD display terminal generates a comprehensive color reference X for the current control cycle based on a confidence environment reference, content information, and current screen output status information. base (t), preferably represented as X base (t)=[B base (t), W base (t)]. Where B is... base (t) is the brightness reference, W base (t) represents the white point reference. The LCD display terminal pre-establishes a brightness reference mapping table and a white point reference mapping table; among them, for B... base (t), first, the confidence ambient illuminance, ambient illuminance change trend, display content brightness characteristics, and current brightness output value are classified into categories, and then the brightness reference value is read from the preset brightness reference mapping table according to the corresponding category combination; for W base (t) First, the confidence environment comprehensive color reference, neutral color area proportion, content type, and current white point output value are classified into categories. Then, the white point reference value is read from the preset white point reference mapping table according to the corresponding category combination. Under the same input category conditions and the same mapping table conditions, B base (t) and W base The output of (t) is uniquely determined.

[0045] Subsequently, the LCD display terminal recursively calculates a new comprehensive color transition reference state based on the comprehensive color transition reference state of the previous control cycle and the comprehensive color reference of the current control cycle. The comprehensive color transition reference state is preferably represented as X. ref(t)=[B ref (t),W ref (t)]. Where B is... ref (t) represents the brightness transition reference state, W ref (t) represents the white point transition reference state, which can be expressed as: ; Where, λ B (t) and λ W (t) represents the recursive fusion intensity of the luminance dimension and the white point dimension, respectively, used to characterize the absorption ratio of the corresponding dimension to the previous control cycle state and the current comprehensive color reference; λ B (t) or λ W The larger λ is, the more the corresponding dimension tends to maintain the transitional reference state of the previous control cycle, and the slower the update speed; B (t) or λ W The smaller (t) is, the more the corresponding dimension is biased towards absorbing the comprehensive color reference of the current control cycle, and the faster the update speed. The LCD display terminal pre-establishes a fusion intensity mapping table and determines λ according to the following rules. B (t) and λ W (t): First, based on the confidence ambient illuminance reference and the confidence ambient comprehensive color reference from the most recent consecutive control cycles, calculate the luminance-related environmental stability and the white point-related environmental stability respectively, and classify them into three levels: high stability, medium stability, and low stability; then, based on the environmental perception confidence value Q... env (t) Compared with the preset credibility grading threshold, the credibility of environmental perception is divided into three levels: high, medium, and low; then, based on the input sufficiency coefficient Q... in (t) Compared with the preset sufficiency classification threshold, the input sufficiency is divided into three levels: high, medium, and low. Then, combining the current adjustment state indicator and the most recent direction reversal or replanning state, the corresponding basic fusion intensity is read from the preset fusion intensity mapping table and corrected. When the environmental stability level is high, the environmental perception confidence level is high, and the input sufficiency level is high, a smaller recursive fusion intensity is read; when the environmental stability level is low, the environmental perception confidence level is low, the input sufficiency level is low, or there have been direction reversals or replannings in the most recent consecutive control cycles, a larger recursive fusion intensity is read; when the input sufficiency level is low and the environmental perception confidence level is lower than the preset confidence threshold, the comprehensive color transition reference state of the previous control cycle remains unchanged. Finally, the LCD display terminal reads and corrects the λ... B (t) and λ W (t) Implement upper and lower limit constraints to ensure that the limits are always within the preset effective range.

[0046] After obtaining the comprehensive color transition reference state for the current control cycle, the LCD display terminal further combines the confidence environment benchmark, content information, time period information, and current display configuration parameters of the current round to generate a collaborative comfort target for the current scenario. The collaborative comfort target refers to the target state that the LCD display terminal expects to achieve jointly in terms of brightness and white point dimensions from a comprehensive color perspective within the current control cycle, used to characterize the target position of coordinated brightness and white point adjustment in the current scenario; the collaborative comfort target is preferably represented as a two-dimensional target vector X. tar (t)=[B tar (t), W tar [(t)], where B tar (t) represents the target brightness control value, W tar (t) represents the target white point control quantity.

[0047] In terms of brightness, the target brightness control quantity can be expressed as: ; Where, ΔB cont (t) represents the content correction amount, ΔB pri (t) represents the information display priority correction amount, ΔB mode (t) represents the brightness dimension display mode correction amount. The LCD display terminal pre-establishes a content correction mapping table, a priority correction mapping table, and a brightness mode mapping table. For ΔB... cont (t), the LCD display terminal first extracts the average brightness, bright area ratio, dark area ratio, content type, and key display area brightness contrast features of the currently displayed content, and divides them into corresponding levels according to preset thresholds. Then, based on the combination of average brightness level, bright area ratio level, dark area ratio level, content type level, and key area contrast level, it reads the corresponding brightness content correction amount from the content correction mapping table; for ΔB pri (t), the LCD display terminal first determines the priority level of the current dominant information element and the contrast status of the key display area, and then reads the corresponding brightness priority correction amount from the priority correction mapping table based on the combination of priority level and contrast status; for ΔB mode (t), the LCD display terminal reads the corresponding brightness dimension display mode correction amount from the preset brightness mode mapping table according to the current time period identifier and display mode identifier.

[0048] In the white point dimension, the target white point control quantity can be expressed as: ; Wherein, ΔW neu (t) represents the correction amount for the neutral color region, ΔW mode (t) represents the white point dimension display mode correction amount, ΔW pull(t) represents the pullback correction amount to the neutral white point. The LCD display terminal pre-establishes a neutral color correction mapping table, a white point mode mapping table, and a pullback correction mapping table. For ΔW neu (t), the LCD display terminal first extracts the proportion of neutral color areas and content type of the currently displayed image, and divides them into corresponding levels according to preset thresholds. Then, based on the combination of neutral color area level and content type level, it reads the corresponding white point correction amount from the neutral color correction mapping table; among them, the higher the proportion of neutral color areas, the stronger the restriction on white point offset. For ΔW mode (t), the LCD display terminal reads the corresponding white point dimension display mode correction amount from the preset white point mode mapping table based on the current time period identifier and display mode identifier. For ΔW pull (t), the LCD display terminal first calculates the deviation of the current white point reference from the preset neutral white point, and combines the neutral color area proportion level, content type level, environmental stability level, and environmental perception credibility level. Based on the combination of deviation level, neutral color area level, content type level, environmental stability level, and credibility level, it reads the corresponding pull-back correction amount from the pull-back correction mapping table; ΔW pull The direction of (t) is fixed so that the target white point moves closer to the preset neutral white point direction.

[0049] When the validity score of a key input item required for calculating a certain target component is lower than a preset lower limit, the LCD display terminal generates the corresponding restricted target value; when the target calculations in both the brightness and white point dimensions are insufficient to support the generation of a complete target, the LCD display terminal generates a conservative target control vector with limited deviation from the current output, which can be expressed as: ; Where, ΔB max1 and ΔW max1 These represent the maximum allowable deviations of the target brightness control value and the target white point control value relative to the current output value within the current control cycle, respectively, used to limit the target deviation between the cooperative comfort target and the current output. The LCD display terminal pre-establishes a limiting mapping table and determines ΔB based on the current time period identifier, display mode identifier, input adequacy level, environmental perception confidence level, and remaining adjustable space. max1 and ΔW max1 Under the same input conditions and the same mapping table, ΔB max1 and ΔW max1The value of `limit` is uniquely determined. `limit(∙)` represents a limiting function, used to restrict the target offset within a preset range. Specifically, when the target offset is greater than the corresponding positive upper limit, the positive upper limit value is used; when the target offset is less than the corresponding negative lower limit, the negative lower limit value is used; otherwise, the target offset remains unchanged. For example, for `limit(x, -L, L)`: when x > L, L is used; when x < -L, -L is used; when -L ≤ x ≤ L, x is used.

[0050] After generating the collaborative comfort target for the current control cycle, the LCD display terminal does not directly start adjustment based on the difference between the current actual screen output value and the target brightness control amount and the target white point control amount. Instead, it uses the comprehensive color transition reference state of the current control cycle as a comparison benchmark to calculate the collaborative adaptation difference between the collaborative comfort target and the comprehensive color transition reference state.

[0051] Cooperative adaptation difference optimization is represented as a two-dimensional target vector ΔX ada (t)=[ΔB ada (t), ΔW ada [(t)], where ΔB ada (t) represents the co-adaptive difference in the brightness dimension, ΔW ada (t) represents the co-adaptation difference in the white point dimension, which can be expressed as follows: ; To avoid unnecessary adjustments triggered by transient noise or short-term fluctuations, the LCD display terminal can also perform effective adjustment threshold judgment and amplitude limiting processing on the co-adaptation difference. That is, it is only considered a valid adjustment request when the co-adaptation difference in the corresponding dimension persists and exceeds the preset effective adjustment threshold. Simultaneously, the difference can be limited using `clip(∙)` to keep it within the maximum allowable offset range of the corresponding dimension. Here, `clip(∙)` represents the difference limiting function, used to limit the co-adaptation difference within the allowable offset range of the current control cycle. The LCD display terminal pre-sets the maximum allowable offset amplitude ΔB for the brightness dimension and the white point dimension respectively. lim and ΔW lim Within the same control cycle, when ΔB ada (t) is greater than ΔB lim When, take ΔB lim When ΔB ada (t) is less than -ΔB lim When, take -ΔB lim In all other cases, ΔB remains constant. ada (t) remains unchanged; when ΔW ada (t) is greater than ΔW lim When, take ΔW lim When ΔW ada (t) is less than -ΔW limWhen, take -ΔW lim In all other cases, keep ΔW ada (t) remains unchanged. For example, for clip(x, -L, L): when x>L, take L; when x<-L, take -L; when -L≤x≤L, take x. Under the same input conditions and the same limiting parameter, the output of clip(∙) is uniquely determined.

[0052] After obtaining the cooperative adaptation difference for the current control cycle, the LCD display terminal first enters the observation and locking phase. The observation and locking phase is used to comprehensively confirm the persistence, effectiveness, and overall color influence of the current adjustment demand, so as to avoid false triggering of adjustments caused by instantaneous noise, short-term environmental disturbances, or short-term changes in content.

[0053] During the observation and locking phase, the LCD display terminal continuously monitors the duration, direction of change, and amplitude stability of the brightness dimension co-adaptation difference and the white point dimension co-adaptation difference within a preset observation window. After completing the continuity judgment, it further calculates the comprehensive color change impact index J of the brightness component. BW The combined color change impact index J of (t) and white point component WB (t). Among them, the comprehensive color change impact index J of the luminance component. BW The combined color change impact index J of (t) and white point component WB (t) represents the degree of impact on the overall color continuity when the current control cycle advances only the brightness dimension or only the white point dimension, respectively, while keeping the other dimension unchanged. The LCD display terminal pre-establishes impact index calculation rules and calculates the overall color shift, single-cycle change amplitude, and sensitivity coefficient of the neutral color region of the current content caused by advancing the corresponding dimension alone. Subsequently, the above three quantities are normalized and weighted according to preset weights to obtain J. BW (t) and J WB (t). Among them, the comprehensive color offset is determined based on the change in the comprehensive color representation quantity relative to the current comprehensive color state after individual advancement; the single-cycle change amplitude is determined based on the expected advancement amount of the current control cycle for that dimension; and the neutral color region sensitivity coefficient is read from the preset sensitivity mapping table based on the current neutral color region proportion level. Under the same input conditions, the same weights, and the same mapping table, J BW (t) and J WB The value of (t) is uniquely determined.

[0054] The LCD display terminal compares the magnitude of the combined color change impact index of the luminance component and the white point component, and combines the amplitude and duration of the difference in the two dimensions to determine whether to adopt a luminance-dominated mode, a white point-dominated mode, or a dual-dominated collaborative mode for the current round.

[0055] If the difference in adaptive brightness persists, and the overall color change impact index of the brightness component is lower than that of the white point component, or if the current scene requires significantly higher brightness visibility than white point adjustment, then the LCD display terminal determines that the current adjustment adopts a brightness-dominated approach.

[0056] If the white point dimension collaborative adaptation difference persists, and the comprehensive color change impact index of the white point component is lower than that of the comprehensive color change impact index of the brightness component, or the current scene's comprehensive color adaptation requirement for white point adjustment is higher than the immediate requirement for brightness adjustment, then the LCD display terminal determines that the current adjustment adopts the white point-dominated mode.

[0057] If the adaptive differences in both the brightness and white point dimensions persist, and both meet the effective adjustment thresholds, while the overall color change impact indices of both the brightness and white point components are within acceptable ranges, then the LCD display terminal determines that this round of adjustment adopts a dual-dominant collaborative approach of brightness and white point. Here, "acceptable range" means that the corresponding overall color change impact index does not exceed the preset impact threshold J. th The range of values; when the combined color change impact index of the luminance component and the combined color change impact index of the white point component are both less than or equal to J. th At that time, it was determined to be within an acceptable range.

[0058] When the input is insufficient, the reliability of the environmental perception is low, the current situation is still within the influence range of the previous round of adjustment, or there is a reversal or replanning of the output direction in the most recent consecutive control cycles, the LCD display terminal prohibits dual-dominant coordination and only allows one of the following modes: brightness-dominant mode, white point-dominant mode, or hold mode.

[0059] When the LCD display terminal confirms during the observation and locking phase that a new scene trend has formed and that the collaborative adaptation difference of the current control cycle is sustainable and effective, the LCD display terminal does not directly advance the brightness and white point to the collaborative comfort target of the current cycle. Instead, it first enters the pre-adaptation phase. The purpose of setting up the pre-adaptation phase is to release the change components that are more likely to cause violations of the overall color continuity in a restricted and gradual manner before formally entering collaborative convergence, thereby establishing a stable starting point for subsequent collaborative convergence.

[0060] The pre-adaptation phase outputs the current actual screen brightness value B. out (t) and the current actual white point output value W on the screen out (t) serves as the starting point for execution. The comprehensive color transition reference state is used as the adjustment reference baseline. Combined with the current round's collaborative adaptation difference, dominant adjustment mode, input sufficiency level, and environmental perception credibility state, the pre-adaptive advancement strategy for this round is determined.

[0061] When the current round is determined to be dominated by white points, the LCD display terminal first performs a small pre-adaptive adjustment on the white point dimension, while maintaining the same or only performing a weak follow adjustment on the brightness dimension. This can be represented as: ; When the current round is determined to be brightness-dominated, the LCD display terminal first performs pre-adaptive advancement on the brightness dimension, while keeping the white point dimension unchanged or delaying compensation. This can be expressed as: ; Among them, K B (t) and K W (t) represents the pre-adaptive propagation coefficients in the luminance and white point dimensions, respectively, ΔB pre and ΔW pre ε represents the upper limit of single-cycle pre-adaptive propulsion in the corresponding dimension. B (t) and ε W (t) represent weak following amount or delayed compensation amount respectively; the above amounts are preferably determined by a preset pre-adaptation parameter mapping table based on the amplitude level of the co-adaptation difference, the duration level of the co-adaptation difference, the credibility level of environmental perception, the input sufficiency level, and the current dominant adjustment mode.

[0062] When the current round is determined to be a dual-dominant collaborative mode, brightness and white point do not necessarily start simultaneously or at the same speed. Instead, the dimension with the smaller impact of overall color change and clearer adjustment needs is preferred to establish the direction first, and the other dimension follows up under constrained conditions. The single-cycle advancement amount, the order of precedence, and whether the other component is allowed to weakly follow during the pre-adaptation phase are not fixed parameters, but are jointly determined by the amplitude of the collaborative adaptation difference, the duration of the collaborative adaptation difference, the current dominant adjustment mode, the credibility of environmental perception, and the input sufficiency level.

[0063] Once the LCD display terminal confirms that the current output has begun to converge towards the cooperative comfort target of the current round along the direction established in the pre-adaptation phase, it enters the cooperative convergence maintenance phase. The role of the cooperative convergence maintenance phase is to ensure that brightness changes and white point changes are no longer driven as independent adjustment trajectories, but rather generate a comprehensive color cooperative convergence trajectory around the cooperative comfort target of the current round. This allows the two dimensions to jointly approach the target brightness control amount and the target white point control amount at the comprehensive color level.

[0064] During the co-convergence maintenance phase, the relative relationship between brightness change and white point change is constrained. This relative relationship includes at least the co-convergence ratio ρ of white point change relative to brightness change. BW (t) The number of startup lead cycles n for the relative brightness of the white point lead (t), the maximum change in a single period, and the cumulative rate of change; where ρ BW (t) and nlead (t) The preferred approach is determined using a pre-set collaborative constraint mapping table, based on the current scene type, the proportion of neutral color areas, the environmental perception credibility level, and the comprehensive color change impact index. The cumulative change rhythm is used to limit the cumulative advancement ratio and speed of the white point dimension relative to the brightness dimension within multiple consecutive control cycles. The LCD display terminal uses a pre-set rhythm constraint table to constrain the proportional relationship between the cumulative change in white point and the cumulative change in brightness within a continuous window, as well as the upper limit of the cumulative change, thereby preventing the white point dimension from accumulating too quickly or lagging too much relative to the brightness dimension during continuous advancement. In the brightness dimension, the LCD display terminal advances in the following manner: ; In terms of white point dimensions, LCD display terminals are advanced in the following manner: ; Where, ΔB max2 This indicates the maximum allowable increase in the brightness dimension within the current control cycle, used to limit the change in brightness output per cycle; the LCD display terminal determines ΔB based on the current scene type, neutral color area proportion level, environmental perception confidence level, input sufficiency level, and remaining adjustable space in the brightness dimension. max2 ΔW max2 This represents the maximum allowable increment of the white point dimension within the current control cycle, used to limit the change in white point output per cycle; the LCD display terminal determines ΔW based on the current scene type, neutral color area proportion level, environmental perception confidence level, input sufficiency level, and remaining adjustable space of the white point dimension. max2 k B (t) and k W (t) represent the advancement coefficients of the brightness and white point dimensions within the current control cycle, respectively, used to characterize the absorption ratio of the cooperative adaptation difference in the corresponding dimensions. The LCD display terminal pre-establishes an advancement coefficient mapping table and, based on the current scene type and cooperative ratio ρ, [the table is then used to define the advancement coefficient mapping table]. BW (t), Start-up leading cycle number n lead (t), the proportion of neutral color areas and the credibility level of environmental perception are determined by k B (t) and k W (t); Under the same input conditions and the same mapping table, k B (t) and k W The value of (t) is uniquely determined. Specifically, when the current scene prioritizes brightness, increasing k... B (t) or decrease k W (t); When the current scenario requires the white dot to follow slowly, increase n. lead (t) for k W (t) constraint; when the proportion of neutral color regions is high or the environmental perception credibility is low, reduce kW (t) to reduce the speed of advancement in the white point dimension; finally, for k B (t) and k W (t) Implement upper and lower limit constraints to keep them within the preset valid range.

[0065] During the collaborative convergence maintenance phase, the LCD display terminal continuously monitors the changing trends of the collaborative adaptation difference in the brightness dimension and the collaborative adaptation difference in the white point dimension. When the collaborative adaptation difference in both dimensions falls within their respective maintenance threshold ranges for M consecutive control cycles, the current collaborative convergence process is deemed to have met the maintenance condition and enters the maintenance state. In the maintenance state, the LCD display terminal only performs minor compensation or maintains the current output stability to wait for the next effective scene change to occur. When the sign of the collaborative adaptation difference in either dimension reverses, the absolute value increases again for K consecutive control cycles, or the target control quantity flips relative to the target direction of the previous control cycle in a preset direction, the current convergence process is deemed to have failed, and the process returns to the observation and locking phase for re-evaluation.

[0066] After completing one round of coordinated adjustment, the LCD display terminal performs a comprehensive evaluation of the adjustment effect of the current round. The comprehensive evaluation includes at least the costs of parameter transitions, lag, oscillation, reverse manual intervention, overall color discontinuity, and insufficient data. The LCD display terminal can calculate the sub-item results for each evaluation dimension separately and obtain the comprehensive evaluation result J for the current round based on preset weights. all It can be represented as: ; Among them, J step J represents the cost of parameter transition. lag J represents the lagged cost. osc J represents the cost of oscillation. man J represents the cost of reverse manual intervention. col J represents the cost of color discontinuity in the overall color scheme. dat J represents the cost of insufficient data, with ω1 to ω6 being the corresponding weights. If there is no manual input from the user in the current round, then J... man The parameter transition cost can be zero or excluded from the evaluation. The optimal parameter transition cost is determined based on the single-cycle change amplitude and slope of brightness and white point; the optimal hysteresis cost is determined based on the continuous deviation of the current output from the cooperative comfort target; the optimal oscillation cost is determined based on the number of output direction reversals and the output fluctuation amplitude; the optimal reverse manual intervention cost is determined based on whether the user's manual adjustment direction is opposite to the system's current adjustment direction and the frequency of such occurrences; the optimal cost of comprehensive color discontinuity is determined based on the degree of abrupt change in the comprehensive color trajectory and the degree of non-smoothness of the comprehensive color shift; and the optimal cost of insufficient data is determined based on the input sufficiency level and the duration of alternative estimation or downgraded control.

[0067] After obtaining the comprehensive evaluation results, the LCD display terminal not only corrects the subsequent dimming strategy, but also performs reverse correction on the environmental perception correction link.

[0068] Regarding dimming strategy correction, when the lag cost exceeds the limit while the oscillation cost and parameter transition cost do not, the LCD display terminal shortens the observation lock time and / or increases the pre-adaptive advancement ratio of the corresponding dimension by a fixed step size; when the oscillation cost or parameter transition cost exceeds the limit, the LCD display terminal extends the observation lock time by a fixed step size, reduces the pre-adaptive advancement ratio of the corresponding dimension, tightens the single-cycle limiting threshold, and increases the freeze trigger sensitivity; when the comprehensive color discontinuity cost exceeds the limit, the LCD display terminal reduces the upper limit of the coordination ratio by a fixed step size, adjusts the brightness and white point priority order, and tightens the dual-dominant coordination conditions; when the data insufficiency cost exceeds the limit, the LCD display terminal tightens the default template calling conditions and triggers the degradation control strategy in advance.

[0069] Regarding the environmental perception correction link, when dimming oscillations are significant and the corrected environmental result remains highly synchronized with screen output changes, the LCD display terminal increases the pseudo-environment stripping intensity by a fixed step size. When the corrected environmental result deviates significantly from the auxiliary environmental result but no significant coupling oscillations occur during dimming, the LCD display terminal decreases the corresponding pseudo-environment stripping intensity by a fixed step size. When the cost of integrated color discontinuity is high and the frequency of environmental integrated color changes is abnormal, the LCD display terminal tightens the environmental correction result limiting threshold by a fixed step size and increases the trigger sensitivity of the environmental hold mode. Simultaneously, the LCD display terminal can also adjust the environmental perception credibility threshold and the historical environmental result inheritance duration by a fixed step size based on the comprehensive evaluation results. All corrected parameters are subject to upper and lower limit constraints to ensure the objectivity, reproducibility, and stability of parameter updates in subsequent rounds.

[0070] Example 1 provides a method for comfort dimming of an LCD screen based on environmental perception. After acquiring scene-related input information, the LCD display terminal first performs environmental perception correction and pseudo-environment component removal on the original observation results of the environmental sensor to generate a confidence environmental reference. Then, based on the confidence environmental reference, it generates a comprehensive color reference, a comprehensive color transition reference state, and a cooperative comfort target, and calculates the cooperative adaptation difference. Subsequently, it achieves coordinated adjustment of brightness and white point through observation locking, pre-adaptation advancement, and cooperative convergence maintenance. Finally, it performs bidirectional correction of the dimming strategy and environmental perception link based on the comprehensive evaluation results, thereby improving the accuracy of environmental reference, dimming continuity, and comprehensive color coordination.

[0071] Example 2: Building upon Example 1, to enable the LCD display terminal to quickly recall historically effective adjustment experience for recurring similar scenarios after multiple runs, this example further provides a method for forming, recalling, and updating a long-term collaborative rhythm template and an environmental correction template. For example... Figure 3As shown, the method includes steps such as historical sample recording, effective sample screening, scenario-based signature classification, template generation, template invocation, and template iterative update.

[0072] During multiple rounds of operation, the LCD display terminal continuously records the scene signature, control process parameters, and comprehensive evaluation results corresponding to each round of adjustment. The scene signature is composed of environmental illuminance level, environmental stability level, environmental comprehensive color characteristic level, content type, neutral color area proportion level, information display priority level, input sufficiency level, and environmental perception credibility level. After obtaining multiple historical samples, the LCD display terminal selects valid samples that meet preset evaluation conditions and categorizes them according to the scene signature. Valid samples are preferably historical samples whose comprehensive evaluation results are below a preset upper limit and show no severe oscillations or significant discontinuities in comprehensive color.

[0073] When the number of valid samples for a certain scenario reaches the preset minimum number of samples, the LCD display terminal performs statistical extraction on the control process parameters in the valid samples of that scenario to generate a long-term collaborative rhythm template and an environmental correction template for the corresponding scenario. The long-term collaborative rhythm template may include at least the observation lock duration, pre-adaptation advancement ratio, brightness and white point priority order, upper limit of the collaborative ratio, single-cycle limiting threshold, freezing conditions, and dual-dominant collaborative triggering conditions. The environmental correction template may include at least the pseudo-environment stripping strength, environmental perception credibility threshold, environmental retention mode triggering conditions, environmental correction result limiting strength, and historical environmental result inheritance duration.

[0074] When the LCD display terminal re-enters a scenario that matches the applicable feature range of the template, the corresponding template is used as the initial control basis for the current control cycle. Based on the template and combined with the real-time input of the current cycle, the environmental correction, target generation, coordinated adjustment, and comprehensive evaluation processes in Example 1 are executed. The LCD display terminal does not replace real-time calculation with the template, but uses the template as the initial control basis to shorten the time required to enter a stable adjustment state and improve control consistency in repetitive scenarios.

[0075] Furthermore, the long-term collaborative rhythm template and the environmental correction template are not fixed. During subsequent operation, the LCD display terminal continues to incorporate newly added valid samples into the corresponding scenario categories and iteratively updates the long-term collaborative rhythm template and the environmental correction template based on these new valid samples. In this way, the LCD display terminal can develop reusable control experience for different scenarios during long-term operation, while maintaining its adaptability to changes in the environment, content, and the terminal's usage status.

[0076] Example 3: Figure 4As shown, this application also provides an environment-aware LCD screen comfort dimming system for implementing the aforementioned method. The system corresponds to the method steps in Embodiment 1 and the template calling and updating process in Embodiment 2, and includes a scene perception and environmental baseline generation module, a reference state and target generation module, a collaborative adjustment control module, and an evaluation and correction module.

[0077] The scene perception and environmental benchmark generation module is used to acquire scene-related input information and, in accordance with the environmental perception correction and pseudo-environment component stripping process in Example 1, performs correction processing on the original observation results output by the environmental sensor to generate a confidence environmental benchmark for the current control cycle.

[0078] The reference state and target generation module is used to generate a comprehensive color reference for the current control cycle based on the confidence environment benchmark, display content information and current screen output state information, and recursively calculate the comprehensive color transition reference state; at the same time, it generates a collaborative comfort target for the current scene by combining display content information, time period information and current display configuration parameters.

[0079] The collaborative adjustment control module is used to calculate the collaborative adaptation difference based on the relationship between the collaborative comfort target and the comprehensive color transition reference state, and to perform observation locking, pre-adaptation advancement and collaborative convergence maintenance control based on the collaborative adaptation difference, so as to adjust the LCD screen output to converge toward the collaborative comfort target.

[0080] The evaluation and correction module is used to comprehensively evaluate the adjustment effect of the current round after completing a round of coordinated adjustment, and to correct the subsequent dimming strategy and environmental perception parameters based on the evaluation results. When historical sample accumulation is available, it can also be combined with the template mechanism in Example 2 to call or update the long-term coordinated rhythm template and environmental correction template.

Claims

1. A method for adjusting the dimming comfort of a liquid crystal display screen based on environmental perception, characterized in that, Applied to LCD display terminals, the process includes the following steps: Within each control cycle, scene-related input information is acquired for the dimming decision of the current round. Scene-related input information includes dynamic input information and preset parameter information. Dynamic input information includes at least environmental information, content information, current screen output status information, time period information and current display configuration parameters, reference environmental information and interactive operation information. Environmental perception correction and pseudo-environment component removal are performed on the raw observation results of environmental sensors, and a confidence environmental benchmark for the current control cycle is generated based on this. Based on the confidence environment benchmark, content information and current screen output status information, a comprehensive color benchmark for the current control cycle is generated, and the comprehensive color transition reference state is calculated based on this benchmark. Based on the confidence environment benchmark, content information, time period information, and current display configuration parameters, generate a collaborative comfort target for the current scenario; Calculate the cooperative adaptation difference between the cooperative comfort target and the integrated color transition reference state; Based on the aforementioned collaborative adaptation difference, the observation and locking phase is initiated. When a new scenario trend forms during the observation and locking phase, and the collaborative adaptation difference of the current control cycle remains in the same direction for several consecutive preset control cycles and exceeds the corresponding effective adjustment threshold, the pre-adaptation phase begins. When the current actual brightness output value and the current actual white point output value of the LCD display terminal are adjusted along the advancement direction determined in the pre-adaptation stage, and the absolute value of the difference between the current actual brightness output value and the target brightness control value decreases, and the absolute value of the difference between the current actual white point output value and the target white point control value decreases, the coordinated convergence and maintenance stage is entered. After completing one round of coordinated adjustment, the adjustment effect of the current round is comprehensively evaluated and bidirectionally corrected. Based on the comprehensive evaluation results, the subsequent dimming strategy is corrected, and the environmental perception correction process is reversed.

2. The LCD screen comfort dimming method based on environmental perception according to claim 1, characterized in that, After obtaining the scene-related input information used for the current dimming decision, the process also includes: Perform validity determination on scene-related input information. The validity determination includes at least availability determination, timeliness determination, completeness determination, sample size determination, and outlier determination. The input sufficiency coefficient for the current control cycle is calculated based on the effectiveness determination results, and the current state is divided into normal calculation mode, alternative estimation mode and degraded control mode. When the current state is classified as an alternative estimation mode, the missing input is compensated using historical valid values, sliding window statistics, or preset conservative values. When the current state is classified as a degraded control mode, some control components are frozen, the single-cycle change amplitude is tightened, and dual-dominant coordinated regulation is prohibited.

3. The LCD screen comfort dimming method based on environmental perception according to claim 1, characterized in that, The process of performing environmental perception correction and pseudo-environment component removal on the raw observation results of environmental sensors includes: Based on the current brightness output state, the current white point output state, the content characteristics of the sensor's adjacent area, the brightness distribution characteristics of the screen edge area, and the preset structure and calibration parameters, calculate the additional observation increment caused by the screen output, cover plate reflection, and side-incident light in the current control cycle. The additional observation increment includes at least the additional observation increment in the illuminance dimension and the additional observation increment in the comprehensive color dimension. The additional observation increments are separated from the original observation results of the environmental sensor, and the separated results are corrected in combination with spectral correction parameters to obtain the corrected environmental illuminance value and the corrected comprehensive environmental color result. The environmental perception confidence value is calculated based on the residual correlation between the corrected environmental results and the current screen output, the deviation between the corrected environmental results and the reference environmental information, and whether the corrected environmental results meet the preset physical constraints. Based on the environmental perception confidence value, the current corrected environmental results, the historical retained environmental results, and the default safe environmental template are weighted and fused to generate a confidence environmental benchmark.

4. The LCD screen comfort dimming method based on environmental perception according to claim 1, characterized in that, The process of generating a comprehensive color reference for the current control cycle and calculating a comprehensive color transition reference state based on it includes: Generate the brightness reference and white point reference for the current control cycle. The brightness reference is determined by the confidence ambient illuminance, the trend of ambient illuminance change, the brightness characteristics of the displayed content, and the current brightness output. The white point reference is determined by the comprehensive color characteristics of the confidence environment, the proportion of neutral color area, the content type, and the current white point output. The brightness transition reference state of the current control cycle is calculated based on the brightness transition reference state of the previous control cycle and the brightness reference state of the current control cycle. Calculate the white point transition reference state for the current control cycle based on the white point transition reference state of the previous control cycle and the white point reference state of the current control cycle. The update intensity of the integrated color transition reference state is determined by the environmental stability, environmental perception confidence, input sufficiency level, and current adjustment state. When the input data is insufficient or the environmental perception confidence is low, the update intensity of the integrated color transition reference state is reduced. When the input data is insufficient and the environmental perception confidence is lower than a preset threshold, the integrated color transition reference state of the previous control cycle is kept unchanged.

5. The LCD screen comfort dimming method based on environmental perception according to claim 1, characterized in that, The generation of the collaborative comfort goal in the current scenario includes: The target brightness control value is generated based on the brightness reference, content correction amount, information display priority correction amount, and display mode correction amount; The target white point control value is generated based on the white point reference, the neutral color area correction amount, the display mode correction amount, and the pull-back correction amount to the neutral white point. Specifically, when the current time period falls within a preset nighttime period and the content type is a preset reading category, the target brightness control amount is reduced and the target white point control amount is shifted towards warm white; when the confidence ambient illuminance exceeds a preset strong light threshold, the target brightness control amount is increased and the target white point control amount is pulled back towards the neutral white point position; when the information display priority parameter exceeds a preset priority threshold, the target weight of the brightness dimension is increased, and the change range of the white point dimension is restricted or delayed. When the key input required for the calculation of a certain target component is insufficient, a corresponding restricted target value is generated; when the target calculations in both the brightness dimension and the white point dimension are insufficient to support the generation of a complete target, a conservative target control vector with a limited deviation from the current output is generated.

6. The LCD screen comfort dimming method based on environmental perception according to claim 1, characterized in that, The cooperative adaptation difference includes: The difference between the target brightness control value and the brightness transition reference state is calculated separately to obtain the brightness dimension co-adaptation difference. The difference between the target white point control value and the white point transition reference state is calculated separately to obtain the white point dimension co-adaptation difference.

7. The LCD screen comfort dimming method based on environmental perception according to claim 1, characterized in that, The pre-adaptation phase includes: In the pre-adaptation phase, the current actual screen brightness output value and the current actual screen white point output value are used as the starting point for execution, and the comprehensive color transition reference state is used as the adjustment reference baseline. The pre-adaptation advancement strategy is determined based on the dominant adjustment method and the magnitude and direction of the corresponding dimension collaborative adaptation difference. When using the white-dot-dominant approach, pre-adaptive advancement is first performed on the white-dot dimension, while the luminance dimension remains unchanged or weakly follows. When using the luminance-dominant approach, pre-adaptive advancement is first performed on the luminance dimension, while the white-dot dimension remains unchanged or is compensated later. When using the luminance and white-dot dual-dominant collaborative approach, the initial advancement ratio and sequence of the two are determined based on the comprehensive color change impact index of the luminance component and the white-dot component, as well as the relative magnitude of the difference in the collaborative adaptation between the two dimensions.

8. The LCD screen comfort dimming method based on environmental perception according to claim 1, characterized in that, The comprehensive evaluation and two-way correction include: The parameter transition cost, lag cost, oscillation cost, reverse manual intervention cost, comprehensive color discontinuity cost, and data insufficiency cost are calculated respectively, and the comprehensive evaluation result of the current round is obtained based on the preset weights. Based on the comprehensive evaluation results, the subsequent dimming strategy is modified. The modification includes at least the observation lock duration, pre-adaptation advance ratio, brightness and white point priority order, synergy ratio upper limit, single-cycle limiting threshold, freeze conditions, default template call conditions, and degradation control strategy when input is insufficient. Based on the comprehensive evaluation results, the environmental perception link is reversed and corrected. The correction includes at least the pseudo-environment stripping intensity, environmental perception credibility threshold, environmental preservation mode triggering conditions, environmental correction result limiting intensity, and historical environmental result inheritance duration. Specifically, when the current round of adjustment oscillation is obvious and the environmental correction result is still highly synchronized with the screen output change, the pseudo-environment stripping intensity is increased; when the cost of comprehensive color discontinuity is high and the frequency of environmental comprehensive color change is abnormal, the pseudo-environment stripping strategy related to white point coupling is enhanced.

9. The LCD screen comfort dimming method based on environmental perception according to claim 1, characterized in that, Also includes: During multiple rounds of operation, the scenario signatures, control process parameters, and comprehensive evaluation results corresponding to each round of adjustment are continuously recorded. The scene signature is composed of environmental illumination level, environmental stability level, environmental comprehensive color feature level, content type, neutral color area proportion level, information display priority level, input sufficiency level, and environmental perception credibility level. Valid samples that meet the preset evaluation conditions are selected from historical operation samples and categorized according to scenario signatures; When the number of valid samples for a certain type of scenario reaches the preset minimum number of samples, statistical extraction is performed on the control process parameters in the valid samples of that type to generate a long-term collaborative rhythm template and an environmental correction template for the corresponding scenario. When the LCD display terminal re-enters a scenario that matches the applicable feature range of the template, the corresponding template is used as the initial control basis for the current control round, and the long-term collaborative rhythm template and the environmental correction template are iteratively updated based on the newly added valid samples.

10. An environment-aware LCD screen comfort dimming system, employing the environment-aware LCD screen comfort dimming method as described in any one of claims 1-9, characterized in that, include: The scene perception and environmental baseline generation module is used to acquire scene-related input information and perform environmental perception correction and pseudo-environment component removal on the raw observation results output by the environmental sensor to generate a confidence environmental baseline for the current control cycle. The reference state and target generation module is used to generate a comprehensive color reference for the current control cycle and recursively calculate the comprehensive color transition reference state based on the confidence environment reference, content information and current screen output state information, and generate a collaborative comfort target for the current scene based on the confidence environment reference, display content information, time period information and current display configuration parameters. The collaborative adjustment control module is used to calculate the collaborative adaptation difference based on the relationship between the collaborative comfort target and the comprehensive color transition reference state, and to perform observation locking, pre-adaptation advancement and collaborative convergence maintenance control based on the collaborative adaptation difference, so as to adjust the LCD screen output to converge toward the collaborative comfort target; The evaluation and correction module is used to comprehensively evaluate the adjustment effect of the current round after completing a round of coordinated adjustment, and to make corrections to subsequent dimming strategies and environmental perception parameters based on the evaluation results.

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