Light sensation self-adaption and white balance cooperative adjustment method and device for LED display screen

Abstract

The invention relates to a light sensation self-adaption and white balance cooperative adjustment method and device for an LED display screen, and the method comprises the steps: collecting the illumination value of current ambient light and the spectral distribution of the ambient light, and calculating the color temperature value of the ambient light; according to the color temperature value, inquiring a pre-stored color temperature-gain parameter corresponding relation library to determine a corresponding white balance gain parameter; according to the illumination value, a backlight brightness adjustment amount is calculated through a pre-constructed logarithm compensation model; associating and binding the white balance gain parameter and the backlight brightness adjustment amount, and outputting the white balance gain parameter and the backlight brightness adjustment amount to a pulse width modulation signal generation unit and a digital-to-analog converter through a microcontroller; and outputting the white balance gain parameter to a digital-to-analog converter, outputting the backlight brightness adjustment amount to a pulse width modulation signal generation unit, generating a synchronous adjustment signal to drive an LED display unit, and carrying out cooperative adjustment of backlight brightness and white balance so as to achieve the purpose of unified regulation and control of visual comfort and color rendition authenticity.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a method and device for coordinated adjustment of light sensitivity adaptation and white balance of an LED display screen. Background Art

[0002] LED displays, with their advantages of high brightness, long life, and vibrant colors, have been widely used in indoor and outdoor advertising, stage performances, sports stadiums, traffic information displays, and high-end conference systems. However, displays that coordinate adaptive light sensitivity with white balance still need improvement. Traditional LED displays have the following drawbacks: First, the current mainstream adaptive light sensitivity solution relies on photosensors deployed on the display or in the surrounding environment to detect ambient light intensity. Based on a preset or dynamically calculated brightness-light curve, the system maps the detected light value to a target average brightness level for the display. This then drives the LEDs through pulse-width modulation or current adjustment for global or local brightness adjustment. This technology effectively addresses visibility issues under varying ambient light conditions and significantly improves energy efficiency. However, its adjustment mechanism primarily focuses on the brightness dimension. Second, to ensure color accuracy, LED displays undergo white balance calibration during production and maintenance. This typically involves adjusting the driving ratio of the red, green, and blue primary color LEDs at a specific target brightness to ensure that the display achieves a specified color temperature when displaying a full white image. Advanced systems may feature multi-level white balance based on temperature sensor feedback or preset curves, maintaining a relatively stable white balance across a limited number of brightness levels. However, this correction is typically performed at static or discrete brightness points, with the adjustment mechanism primarily focused on the color dimension. Third, in existing implementations, the two key technologies (sensor adaptation and white balance adjustment) typically operate independently or weakly coupled, resulting in a disconnect between sensor adaptation and white balance. Fourth, independent adjustment modules make it difficult to achieve optimal coordination between brightness and color during dynamic changes. For example, in the pursuit of extreme energy savings (by keeping brightness very low), color accuracy may be sacrificed due to the inability to maintain white balance. Alternatively, when rapid response to sudden changes in ambient light is required, a delay in white balance correction may result in brief, unusual color shifts. Summary of the Invention

[0003] The main purpose of the present invention is to provide a method and device for coordinated adjustment of light perception and white balance of an LED display screen. Through ambient light perception and hardware-level coordinated control, the backlight brightness and white balance of the LED display screen are synchronously optimized in a dynamic lighting environment to achieve the purpose of unified regulation of visual comfort and color reproduction authenticity.

[0004] To achieve the above objectives, the present invention provides a method for coordinated adjustment of light sensitivity adaptation and white balance of an LED display screen, comprising the following steps: Collect the current ambient light illumination value and ambient light spectrum distribution, and calculate the ambient light color temperature value; According to the color temperature value, querying a pre-stored color temperature-gain parameter correspondence library to determine a corresponding white balance gain parameter; Calculating a backlight brightness adjustment amount using a pre-built logarithmic compensation model according to the illumination value; Associating and binding the white balance gain parameter with the backlight brightness adjustment amount, and outputting the result to a pulse width modulation signal generation unit and a digital-to-analog converter via a microcontroller; The white balance gain parameter is output to a digital-to-analog converter, and the backlight brightness adjustment amount is output to a pulse width modulation signal generation unit to generate a synchronous adjustment signal to drive the LED display unit to perform coordinated adjustment of the backlight brightness and white balance.

[0005] Furthermore, the steps of collecting the current ambient light illumination value and the ambient light spectral distribution and calculating the ambient light color temperature value include: The three light sensors installed on the side, top, and bottom of the display collect the ambient light illumination value and ambient light spectral distribution in different zones. Calculate the average ambient light illumination value based on the ambient light illumination values ​​collected by the partitions; The ambient light color temperature value is calculated according to the ambient light spectral distribution.

[0006] Furthermore, the step of searching a pre-stored color temperature-gain parameter correspondence library to determine a corresponding white balance gain parameter according to the color temperature value includes: Evaluate the expected impact of ambient light on the color temperature of the display surface area based on the spatial relationship between the deployment positions of the three zoned light sensors and the display screen; According to the evaluation result and the ambient light color temperature value, selecting a preset color temperature point closest to the current ambient light color temperature value from a pre-stored color temperature-gain parameter correspondence library; The gain parameter corresponding to the preset color temperature point is determined as the white balance gain parameter.

[0007] Furthermore, the step of constructing the color temperature-gain correspondence library includes: Under standard observation conditions, simulate different ambient light exposures of specific color temperatures, adjust the gain parameters of the RGB primary colors until the chromaticity coordinates of the specific white area presented on the display screen are consistent with the chromaticity coordinates of the simulated ambient light, and record the corresponding RGB gain parameters as the reference white balance gain parameters under the corresponding simulated ambient light conditions; Record each group of simulated ambient light color temperature values ​​and the corresponding reference white balance gain parameters; Based on the recorded sets of simulated ambient light color temperature values ​​and corresponding reference white balance gain parameters, a color temperature-gain correspondence library is constructed.

[0008] Furthermore, the step of calculating the backlight brightness adjustment amount according to the illumination value using a pre-built logarithmic compensation model includes: Based on the pre-built logarithmic compensation model, the rate of change of ambient light illumination value is monitored in real time; When the change rate exceeds a preset rapid change threshold, a smooth transition mechanism is enabled to calculate the backlight brightness adjustment amount, and the smooth transition mechanism limits the instantaneous change amplitude of the backlight brightness adjustment amount; When the change rate is lower than the preset rapid change threshold, the backlight brightness adjustment amount is directly calculated according to the logarithmic compensation model.

[0009] The logarithmic compensation model is based on the logarithmic perception characteristics of the human visual system to light intensity, and establishes a logarithmic compensation model of the ambient light illumination value and the backlight brightness compensation amount.

[0010] Furthermore, the step of associating and binding the white balance gain parameter with the backlight brightness adjustment amount and outputting the result to a pulse width modulation signal generating unit and a digital-to-analog converter via a microcontroller includes: Marking the white balance gain parameter and the backlight brightness adjustment amount as a collaborative adjustment parameter pair at the same time; The coordinated adjustment parameter pair is output to the input register of the digital-to-analog converter and the control register of the pulse width modulation signal generating unit through the parallel output interface of the microcontroller.

[0011] Furthermore, the step of outputting the white balance gain parameter to a digital-to-analog converter, outputting the backlight brightness adjustment amount to a pulse width modulation signal generation unit, generating a synchronous adjustment signal to drive the LED display unit, and performing coordinated adjustment of the backlight brightness and white balance includes: Converting the backlight brightness adjustment amount into a pulse width modulation duty cycle signal through a pulse width modulation signal generation unit; Convert the white balance gain parameter into the driving voltage of RGB pixels through a digital-to-analog converter; Integrating the pulse width modulation duty cycle signal with the drive voltage to generate a unified display drive instruction set, wherein the pulse width modulation duty cycle signal is used to control the backlight brightness and the drive voltage is used to control the RGB pixel intensity; Based on the display driving instruction set, the LED display unit is synchronously driven to perform coordinated adjustment of backlight brightness and white balance.

[0012] The present invention also provides a method and device for coordinated adjustment of light sensitivity adaptation and white balance of an LED display screen, comprising: The data acquisition module is used to collect the current ambient light illumination value and ambient light spectrum distribution, and calculate the ambient light color temperature value; A white balance generation module is configured to query a pre-stored color temperature-gain parameter correspondence library to determine a corresponding white balance gain parameter according to the color temperature value; a brightness calculation module, configured to calculate a backlight brightness adjustment amount based on the illumination value using a pre-built logarithmic compensation model; The collaborative control module is used to associate and bind the white balance gain parameter with the calculated backlight brightness adjustment amount, and output it to the pulse width modulation signal generation unit and the digital-to-analog converter through the microcontroller.

[0013] The driving execution module is used to output the white balance gain parameter to the digital-to-analog converter, output the backlight brightness adjustment amount to the pulse width modulation signal generation unit, generate a synchronous adjustment signal to drive the LED display unit, and perform coordinated adjustment of the backlight brightness and white balance.

[0014] The present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the above-mentioned LED display screen photosensitivity adaptation and white balance coordinated adjustment method are implemented.

[0015] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the above-mentioned LED display screen photosensitivity adaptation and white balance coordinated adjustment method are implemented.

[0016] The method and device for adaptive light perception and coordinated white balance adjustment of LED display screens provided by the present invention have the following beneficial effects: the present invention eliminates color deviation and brightness discomfort of the display screen through real-time coordinated adjustment of ambient light color temperature and illuminance, and maintains the color authenticity and visual comfort of the picture in a dynamic lighting environment; innovatively integrates the logarithmic perception model and the spatial color temperature compensation algorithm to achieve human eye bionic adjustment with low computing power overhead, reducing system power consumption and hardware costs; adopts a multi-sensor weight distribution and signal synchronization binding mechanism to effectively suppress screen tearing caused by sudden changes in ambient light, spatial non-uniformity and transmission delays; the modular design supports complex working conditions such as in-vehicle and outdoor conditions, and ensures stable driving of high refresh rate screens through atomic-level instruction set integration, thereby improving product reliability; the parameter library pre-calibration and interpolation mechanism simplifies the production line debugging process, avoiding the efficiency and consistency defects of traditional manual white balance correction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 1 is a flow chart of a method for coordinated adjustment of photosensitivity adaptation and white balance of an LED display screen according to an embodiment of the present invention; Figure 2 This is a structural block diagram of a method and device for adaptive light perception and coordinated white balance adjustment of an LED display screen in one embodiment of the present invention; Figure 3 It is a schematic block diagram of the structure of a computer device according to an embodiment of the present invention.

[0018] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] Reference Figure 1 , which is a flow chart of a method for coordinated adjustment of photosensitivity adaptation and white balance of an LED display screen proposed by the present invention, comprising the following steps: S1, collect the current ambient light illumination value and ambient light spectrum distribution, and calculate the ambient light color temperature value; S2, according to the color temperature value, querying a pre-stored color temperature-gain parameter correspondence library to determine a corresponding white balance gain parameter; S3, calculating a backlight brightness adjustment amount according to the illumination value using a pre-built logarithmic compensation model; S4, associating and binding the white balance gain parameter with the backlight brightness adjustment amount, and outputting the result to a pulse width modulation signal generation unit and a digital-to-analog converter via a microcontroller; S5, outputting the white balance gain parameter to a digital-to-analog converter, outputting the backlight brightness adjustment amount to a pulse width modulation signal generating unit, generating a synchronous adjustment signal to drive the LED display unit, and performing coordinated adjustment of the backlight brightness and white balance.

[0021] In one embodiment, for step S1, The steps of collecting the current ambient light illumination value and the ambient light spectral distribution and calculating the ambient light color temperature value include: The three light sensors installed on the side, top, and bottom of the display collect the ambient light illumination value and ambient light spectral distribution in different zones. Calculate the average ambient light illumination value based on the ambient light illumination values ​​collected by the partitions; The ambient light color temperature value is calculated according to the ambient light spectral distribution.

[0022] In specific implementations, accurate capture of ambient light parameters is achieved through collaborative acquisition of multiple sensor partitions. Since the top light source (such as sunlight) and the side light source (such as lamplight) have significantly different effects on the color temperature of the display screen, traditional single-point detection cannot distinguish spatial non-uniformity. This embodiment uses a three-point light sensor layout and data acquisition to deploy high-precision light sensors (such as multi-channel photodiodes with spectral analysis capabilities or AS7265 spectral sensors) on the side (S), top (T), and bottom (B) of the display screen to address the directional differences in ambient light. For example: the sensor collects the illuminance values ​​of three areas in real time. (Unit: lux) and spectral power distribution (λ=380nm~780nm), the spectral distribution data is converted into digital signal output by the sensor's built-in ADC. The average ambient light illuminance value is calculated using the spatial weighted average algorithm: ,in, is the weight coefficient (the default is 1), which is dynamically adjusted according to the installation environment of the display (such as the top weight of the outdoor screen Increased to 1.2 to enhance the effect of sunlight) to avoid misjudging the overall illumination due to strong local light sources (such as spotlights). Calculate the chromaticity coordinates based on spectral data: Where, The CIE 1931 XYZ tristimulus values ​​are: Where, is the average value of the three-region spectral data , : CIE standard color matching function Use McCamy's approximation formula to convert chromaticity coordinates to correlated color temperature (Unit: K): in Carry out partition detection and anti-interference design. When the top of the display screen is directly exposed to strong sunlight ( ) when the system automatically upgrades Weighting is used to prevent the bottom shadow area data from lowering the overall illumination value, thereby solving the brightness / color temperature misadjustment problem caused by the directionality of ambient light in traditional solutions.

[0023] In one embodiment, for step S2, The step of searching a pre-stored color temperature-gain parameter correspondence library to determine a corresponding white balance gain parameter according to the color temperature value includes: Evaluate the expected impact of ambient light on the color temperature of the display surface area based on the spatial relationship between the deployment positions of the three zoned light sensors and the display screen; According to the evaluation result and the ambient light color temperature value, selecting a preset color temperature point closest to the current ambient light color temperature value from a pre-stored color temperature-gain parameter correspondence library; The gain parameter corresponding to the preset color temperature point is determined as the white balance gain parameter.

[0024] In practice, the traditional method relies only on the ambient light color temperature value collected by a single sensor, without considering the difference in the projection of ambient light in different areas of the display screen, resulting in color deviation in the edge and center areas of the screen after adjustment. The core of this step is to solve the impact of the uneven spatial distribution of ambient light color temperature on the white balance of the display screen. This embodiment uses the ambient light illumination values ​​collected by three partitioned light sensors (top, bottom, and side) to input the ambient light illumination values ​​collected by the three partitioned light sensors (top, bottom, and side) to obtain the ambient light illumination values ​​collected by the three partitioned light sensors (top, bottom, and side). And the corresponding color temperature value , based on the geometric relationship between the sensor position and the display surface area (e.g. Figure 1 As shown in the figure), define the display area for each sensor The influence weight coefficient : Where, For sensors To area The straight-line distance from the center; For sensors To area The incident angle of the light; To prevent the denominator from being zero, such as ). For each region , weighted synthesis of its expected color temperature value : This model quantifies the effect of ambient light directionality on color temperature distribution (e.g., strong light from the top causes the cool color temperature to dominate on the screen), thus avoiding adjustment errors caused by the limited position of the sensor. Preset color temperature point selection rule: Let the set of pre-stored color temperature points in the parameter library be { | }We need to find the following : Where, is the average ambient illumination, is the illumination weight function. The optimal preset color temperature point Corresponding RGB gain parameter group Output as the current white balance gain parameter. By distributing weights across multiple sensors, this helps address regional color shifts caused by non-uniform ambient light (e.g., a bluish tint at the top of the screen and a yellowish tint at the bottom).

[0025] In one embodiment, the step of constructing a color temperature-gain correspondence library includes: Under standard observation conditions, simulate different ambient light exposures of specific color temperatures, adjust the gain parameters of the RGB primary colors until the chromaticity coordinates of the specific white area presented on the display screen are consistent with the chromaticity coordinates of the simulated ambient light, and record the corresponding RGB gain parameters as the reference white balance gain parameters under the corresponding simulated ambient light conditions; Record each group of simulated ambient light color temperature values ​​and the corresponding reference white balance gain parameters; Based on the recorded sets of simulated ambient light color temperature values ​​and corresponding reference white balance gain parameters, a color temperature-gain correspondence library is constructed.

[0026] In specific implementation, this step is the core foundation of white balance adjustment. Through scientific experiments, an accurate mapping relationship between ambient light color temperature and RGB gain parameters is established to solve the color deviation problem caused by the traditional method relying on empirical parameters. This embodiment uses a standard D65 light source (color temperature 6500K) to illuminate the display screen in a dark room environment to ensure that there is no external light interference. The CIE1931 standard colorimetry system is used to define the target white area as the display area within 10° of the central viewing angle (avoiding color difference at the edge of the screen). Use a programmable spectrum light source (such as an LED mixing system) according to the preset color temperature sequence Generate ambient light (covering 2500K–10000K, with a step size of 500K). Measure the initial chromaticity coordinates of the white area in the center of the display. ,Adjust RGB gain parameters through iterative optimization algorithm , until the chromaticity coordinates are displayed Convergence conditions are met: ( 0.0015 CIE units), where The chromaticity coordinates of the current simulated ambient light (derived from the color temperature Calculated by the blackbody radiation trajectory formula): (McCamy approximation).

[0027] For each , store the corresponding optimal gain parameter group , cubic spline interpolation is used to generate a continuous function for adjacent color temperature points: In the formula, the coefficient Determined by boundary conditions (gain parameter continuity, first-order derivative continuity).

[0028] In one embodiment, for step S3, The step of calculating the backlight brightness adjustment amount according to the illumination value using a pre-built logarithmic compensation model includes: Based on the pre-built logarithmic compensation model, the rate of change of ambient light illumination value is monitored in real time; When the change rate exceeds a preset rapid change threshold, a smooth transition mechanism is enabled to calculate the backlight brightness adjustment amount, and the smooth transition mechanism limits the instantaneous change amplitude of the backlight brightness adjustment amount; When the change rate is lower than the preset rapid change threshold, the backlight brightness adjustment amount is directly calculated according to the logarithmic compensation model.

[0029] The logarithmic compensation model is based on the logarithmic perception characteristics of the human visual system to light intensity, and establishes a logarithmic compensation model of the ambient light illumination value and the backlight brightness compensation amount.

[0030] In practice, traditional linear adjustment models suffer from large brightness jumps, high energy consumption, and poor visual adaptability in high dynamic range scenarios. This step innovatively introduces a segmented logarithmic compensation model and a rate-of-change response mechanism to address two core issues: visual discomfort caused by sudden changes in ambient light and the nonlinearity of human brightness perception. According to the Weber-Fechner law, the human eye's perceived brightness intensity P and physical brightness L are logarithmically related: , where k is the visual sensitivity constant, : Brightness perception threshold. To match this characteristic, establish the ambient illumination E and backlight brightness compensation The mapping model: Real-time calculation of ambient illumination change rate : (Unit: lx / s) Where, : Current sampled illumination value, : Illumination value of the previous cycle, : Sampling interval (default 100 ms). Smooth transition trigger condition: When (typical value 50 lx / s), smooth transition is enabled; when When , the model calculation results are directly output. Smooth transition algorithm: Use the S-curve (Sigmoid) transition function to limit the adjustment range: In sudden changes (such as switching lights on and off), the brightness transitions with a gradual saturation curve to avoid step-jump transition time. Adaptive changes: =2.5 / (Unit: seconds) In one embodiment, for step S4, The steps of outputting the white balance gain parameter to a digital-to-analog converter, outputting the backlight brightness adjustment amount to a pulse width modulation signal generation unit, generating a synchronous adjustment signal to drive an LED display unit, and performing coordinated adjustment of backlight brightness and white balance include: Converting the backlight brightness adjustment amount into a pulse width modulation duty cycle signal through a pulse width modulation signal generation unit; Convert the white balance gain parameter into the driving voltage of RGB pixels through a digital-to-analog converter; Integrating the pulse width modulation duty cycle signal with the drive voltage to generate a unified display drive instruction set, wherein the pulse width modulation duty cycle signal is used to control the backlight brightness and the drive voltage is used to control the RGB pixel intensity; Based on the display driving instruction set, the LED display unit is synchronously driven to perform coordinated adjustment of backlight brightness and white balance.

[0031] In specific implementation, the traditional time-sharing transmission mode will cause the backlight brightness and white balance parameters to be updated out of sync, resulting in instantaneous color cast on the screen (such as the screen briefly turns red when the brightness suddenly changes). This step is achieved through hardware-level collaborative binding and parallel output mechanism. Level 1 synchronization accuracy is achieved to address visual tearing caused by unsynchronized brightness and color temperature adjustments. In this embodiment, a coordinated parameter pair data structure (containing RGB gain parameters in Q8.8 format and a 12-bit PWM duty cycle value) is defined with a timestamp (based on a microcontroller's 0.1μs precision timer). Binding is triggered when ambient light sampling is complete and the parameter changes exceed 5%. A 16-bit parallel interface is used to time-share the gain parameters to the DAC input registers and the PWM values ​​to the control registers (the transmission sequence is: Gain R → Gain G → Gain B → PWM duty cycle). This is coupled with a 10MHz synchronous clock and differential signal transmission (RS-422 standard, clock jitter <±1ns). After data transfer is complete, a rising edge of the LOAD_EN signal is triggered, forcing the PWM and DAC units to synchronize and load the new parameters within 5ns (with a settling time constraint of ≥20ns to meet 74HC register requirements). A three-level fault tolerance mechanism is embedded in the synchronization process: automatic reset if LOAD_EN exceeds 1μs, CRC-8 checksum (polynomial 0x07) is added to the parameter package, and fallback to D65 safety mode after three consecutive errors.

[0032] In one embodiment, for step S5, The steps of outputting the white balance gain parameter to a digital-to-analog converter, outputting the backlight brightness adjustment amount to a pulse width modulation signal generation unit, generating a synchronous adjustment signal to drive an LED display unit, and performing coordinated adjustment of backlight brightness and white balance include: Converting the backlight brightness adjustment amount into a pulse width modulation duty cycle signal through a pulse width modulation signal generation unit; Convert the white balance gain parameter into the driving voltage of RGB pixels through a digital-to-analog converter; Integrating the pulse width modulation duty cycle signal with the drive voltage to generate a unified display drive instruction set, wherein the pulse width modulation duty cycle signal is used to control the backlight brightness and the drive voltage is used to control the RGB pixel intensity; Based on the display driving instruction set, the LED display unit is synchronously driven to perform coordinated adjustment of backlight brightness and white balance.

[0033] In specific implementation, this solution realizes atomic-level synchronization of backlight brightness and white balance through hardware signal integration. In this embodiment, by inputting the backlight brightness adjustment amount into the pulse width modulation signal generation unit, based on the conversion formula (40.95 is the brightness-to-duty cycle conversion factor, and D0 is the base duty cycle.) This generates a 12-bit pulse-width modulated duty cycle signal to drive the LED backlight module. The white balance gain parameter is simultaneously input into a 16-bit digital-to-analog converter and converted into precise drive voltages for the RGB pixels using a voltage mapping model (Vc = 3.3•(1 + 0.33 ln Gc) (C ∈ {R,G,B}, 0.33 is the nonlinear compensation factor, and 3.3V is the base voltage). The duty cycle signal and the three drive voltages are then combined into a unified display driver instruction set. This instruction set includes a synchronization flag 0xA5, four 12-bit payloads (storing the duty cycle value and RGB drive voltages, respectively), and a CRC-8 checksum. This instruction set is transmitted to the LED display unit driver chip via a low-voltage differential signaling interface at 1.2Gbps. Ultimately, backlight brightness adjustment (controlling the MOSFET on-time via the duty cycle) and white balance adjustment (adjusting the RGB current source via the drive voltage) are performed synchronously within a single clock cycle. In an ambient light switching test of an automotive LED display (3000K / 200lx → 6500K / 50lx), this embodiment achieved control indicators of 0.9μs latency, chromaticity shift ΔE <0.8 (CIEDE2000 standard), and backlight power consumption fluctuation of ±3%, completely eliminating color shift caused by sudden brightness changes.

[0034] Reference Figure 2, is a structural block diagram of a method and device for adaptive light perception and coordinated white balance adjustment of an LED display screen in one embodiment of the present invention, comprising: The data acquisition module is used to collect the current ambient light illumination value and ambient light spectrum distribution, and calculate the ambient light color temperature value; A white balance generation module is configured to query a pre-stored color temperature-gain parameter correspondence library to determine a corresponding white balance gain parameter according to the color temperature value; a brightness calculation module, configured to calculate a backlight brightness adjustment amount based on the illumination value using a pre-built logarithmic compensation model; The collaborative control module is used to associate and bind the white balance gain parameter with the calculated backlight brightness adjustment amount, and output it to the pulse width modulation signal generation unit and the digital-to-analog converter through the microcontroller.

[0035] The driving execution module is used to output the white balance gain parameter to the digital-to-analog converter, output the backlight brightness adjustment amount to the pulse width modulation signal generation unit, generate a synchronous adjustment signal to drive the LED display unit, and perform coordinated adjustment of the backlight brightness and white balance.

[0036] For the specific implementation of each module in the above device example, please refer to the above method embodiment, which will not be repeated here.

[0037] Reference Figure 3 In an embodiment of the present invention, a computer device is also provided. The computer device may be a server, and its internal structure may be as follows: Figure 3 As shown. The computer device includes a processor, memory, display screen, input device, network interface and database connected via a system bus. The processor of the computer design is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store the corresponding data in this embodiment. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the above method is implemented.

[0038] Those skilled in the art will understand that Figure 3 The structure shown in the figure is merely a block diagram of a portion of the structure related to the solution of the present invention and does not constitute a limitation on the computer device to which the solution of the present invention is applied.

[0039] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which implements the above-described method when executed by a processor. It is understood that the computer-readable storage medium in this embodiment can be a volatile readable storage medium or a non-volatile readable storage medium.

[0040] In summary, the present invention collects the illuminance value and spectral distribution of the current ambient light and calculates the color temperature value of the ambient light; based on the color temperature value, queries a pre-stored color temperature-gain parameter correspondence library to determine the corresponding white balance gain parameter; based on the illuminance value, calculates the backlight brightness adjustment amount through a pre-built logarithmic compensation model; associates and binds the white balance gain parameter with the backlight brightness adjustment amount, and outputs them to a pulse width modulation signal generation unit and a digital-to-analog converter through a microcontroller; outputs the white balance gain parameter to the digital-to-analog converter, and outputs the backlight brightness adjustment amount to the pulse width modulation signal generation unit, generates a synchronous adjustment signal to drive the LED display unit, and performs coordinated adjustment of the backlight brightness and white balance, so as to achieve the purpose of unified regulation of visual comfort and color reproduction authenticity.

[0041] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware using a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the above-described method embodiments. Any reference to memory, storage, database, or other media provided herein and used in the embodiments may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double-speed SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct RAMbus dynamic RAM (DRDRAM), and RAMbus dynamic RAM.

[0042] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, apparatus, article, or method comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, apparatus, article, or method. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, apparatus, article, or method comprising the element.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for coordinated adjustment of light sensitivity adaptation and white balance of an LED display, characterized in that: The following steps are involved: Collect the current ambient light illumination value and ambient light spectrum distribution, and calculate the ambient light color temperature value; According to the color temperature value, querying a pre-stored color temperature-gain parameter correspondence library to determine a corresponding white balance gain parameter; Calculating a backlight brightness adjustment amount using a pre-built logarithmic compensation model according to the illumination value; Associating and binding the white balance gain parameter with the backlight brightness adjustment amount, and outputting the result to a pulse width modulation signal generation unit and a digital-to-analog converter via a microcontroller; The white balance gain parameter is output to a digital-to-analog converter, and the backlight brightness adjustment amount is output to a pulse width modulation signal generation unit to generate a synchronous adjustment signal to drive the LED display unit to perform coordinated adjustment of the backlight brightness and white balance.

2. The LED display screen photosensitivity adaptation and white balance coordinated adjustment method according to claim 1, characterized in that: The step of collecting the current ambient light illumination value and the ambient light spectral distribution and calculating the ambient light color temperature value includes: The three light sensors installed on the side, top, and bottom of the display collect the ambient light illumination value and ambient light spectral distribution in different zones. Calculate the average ambient light illumination value based on the ambient light illumination values ​​collected by the partitions; The ambient light color temperature value is calculated according to the ambient light spectral distribution.

3. The LED display screen photosensitivity adaptation and white balance coordinated adjustment method according to claim 1, characterized in that: The step of searching a pre-stored color temperature-gain parameter correspondence library to determine the corresponding white balance gain parameter according to the color temperature value includes: Evaluate the expected impact of ambient light on the color temperature of the display surface area based on the spatial relationship between the deployment positions of the three zoned light sensors and the display screen; According to the evaluation result and the ambient light color temperature value, selecting a preset color temperature point closest to the current ambient light color temperature value from a pre-stored color temperature-gain parameter correspondence library; The gain parameter corresponding to the preset color temperature point is determined as the white balance gain parameter.

4. The LED display screen photosensitivity adaptation and white balance coordinated adjustment method according to claim 3, characterized in that: The steps of constructing the color temperature-gain correspondence library include: Under standard observation conditions, simulate different ambient light exposures of specific color temperatures, adjust the gain parameters of the RGB primary colors until the chromaticity coordinates of the specific white area presented on the display screen are consistent with the chromaticity coordinates of the simulated ambient light, and record the corresponding RGB gain parameters as the reference white balance gain parameters under the corresponding simulated ambient light conditions; Record each group of simulated ambient light color temperature values ​​and the corresponding reference white balance gain parameters; Based on the recorded sets of simulated ambient light color temperature values ​​and corresponding reference white balance gain parameters, a color temperature-gain correspondence library is constructed.

5. The LED display screen photosensitivity adaptation and white balance coordinated adjustment method according to claim 1, characterized in that: The step of calculating the backlight brightness adjustment amount according to the illumination value using a pre-built logarithmic compensation model includes: Based on the pre-built logarithmic compensation model, the rate of change of ambient light illumination value is monitored in real time; When the change rate exceeds a preset rapid change threshold, a smooth transition mechanism is enabled to calculate the backlight brightness adjustment amount, and the smooth transition mechanism limits the instantaneous change amplitude of the backlight brightness adjustment amount; When the change rate is lower than the preset rapid change threshold, the backlight brightness adjustment amount is directly calculated according to the logarithmic compensation model. The logarithmic compensation model is based on the logarithmic perception characteristics of the human visual system to light intensity, and establishes a logarithmic compensation model of the ambient light illumination value and the backlight brightness compensation amount.

6. The LED display screen photosensitivity adaptation and white balance coordinated adjustment method according to claim 1, characterized in that: The step of associating and binding the white balance gain parameter with the backlight brightness adjustment amount and outputting the result to a pulse width modulation signal generation unit and a digital-to-analog converter via a microcontroller includes: Marking the white balance gain parameter and the backlight brightness adjustment amount as a collaborative adjustment parameter pair at the same time; The coordinated adjustment parameter pair is output to the input register of the digital-to-analog converter and the control register of the pulse width modulation signal generating unit through the parallel output interface of the microcontroller.

7. The LED display screen photosensitivity adaptation and white balance coordinated adjustment method according to claim 1, characterized in that: The step of outputting the white balance gain parameter to a digital-to-analog converter, outputting the backlight brightness adjustment amount to a pulse width modulation signal generation unit, generating a synchronous adjustment signal to drive an LED display unit, and performing coordinated adjustment of backlight brightness and white balance includes: Converting the backlight brightness adjustment amount into a pulse width modulation duty cycle signal through a pulse width modulation signal generation unit; Convert the white balance gain parameter into the driving voltage of RGB pixels through a digital-to-analog converter; Integrating the pulse width modulation duty cycle signal with the drive voltage to generate a unified display drive instruction set, wherein the pulse width modulation duty cycle signal is used to control the backlight brightness and the drive voltage is used to control the RGB pixel intensity; Based on the display driving instruction set, the LED display unit is synchronously driven to perform coordinated adjustment of backlight brightness and white balance.

8. A device for adaptive light perception and coordinated white balance adjustment of an LED display screen, characterized in that: include: The data acquisition module is used to collect the current ambient light illumination value and ambient light spectrum distribution, and calculate the ambient light color temperature value; A white balance generation module is configured to query a pre-stored color temperature-gain parameter correspondence library to determine a corresponding white balance gain parameter according to the color temperature value; a brightness calculation module, configured to calculate a backlight brightness adjustment amount based on the illumination value using a pre-built logarithmic compensation model; The collaborative control module is used to associate and bind the white balance gain parameter with the calculated backlight brightness adjustment amount, and output it to the pulse width modulation signal generation unit and the digital-to-analog converter through the microcontroller. The driving execution module is used to output the white balance gain parameter to the digital-to-analog converter, output the backlight brightness adjustment amount to the pulse width modulation signal generation unit, generate a synchronous adjustment signal to drive the LED display unit, and perform coordinated adjustment of the backlight brightness and white balance.

9. A computer device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor executes the computer program, the steps of the LED display screen photosensitivity adaptation and white balance coordinated adjustment method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for coordinated adjustment of photosensitivity adaptation and white balance of an LED display screen according to any one of claims 1 to 7 are implemented.

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