CN-122024631-A - Control method of LED display screen and display screen

CN122024631ACN 122024631 ACN122024631 ACN 122024631ACN-122024631-A

Abstract

The invention discloses a control method of an LED display screen and the display screen, the method comprises the steps of analyzing an input image data stream, extracting original brightness data and chromaticity information of each pixel unit, dynamically monitoring aging state factors of the pixel units, calling a nonlinear attenuation compensation algorithm to generate brightness compensation coefficients, establishing an associated mapping of the aging state factors and brightness attenuation degrees by the nonlinear attenuation compensation algorithm, obtaining a mapping relation through training an LED photoelectric degradation experimental data set, carrying out self-adaptive weighted fusion on the original brightness data and the brightness compensation coefficients to generate compensated brightness signals, simultaneously executing color space conversion compensation based on thermal drift characteristics of the chromaticity information, and dynamically dividing refreshing control zones according to brightness distribution characteristics of the pixel units in a display area. According to the invention, through the synergistic control of the pixel-level aging nonlinear compensation and the content-driven partition refreshing, the long-term color uniformity of the display screen is obviously improved, the dynamic blurring and the flicker are eliminated, and the energy efficiency of the system is synchronously optimized.

Inventors

WANG CHENGMING
CHEN JIEMING
LIU HUI
LIU JIACHANG
Mo Lundiao
CHEN SHIQIANG

Assignees

广东科而美光电有限公司

Dates

Publication Date: 20260512
Application Date: 20251230

Claims (10)

1. The control method of the LED display screen is characterized by comprising the following steps: Analyzing an input image data stream, and extracting original brightness data and chromaticity information of each pixel unit; Dynamically monitoring an aging state factor of the pixel unit; A nonlinear attenuation compensation algorithm is called to generate a brightness compensation coefficient, the nonlinear attenuation compensation algorithm establishes an association mapping between an aging state factor and brightness attenuation degree, and the mapping relation is obtained through training of an LED photoelectric degradation experimental data set; Performing self-adaptive weighted fusion on the original brightness data and the brightness compensation coefficient to generate a compensated brightness signal, and simultaneously performing color space conversion compensation based on the thermal drift characteristic of the chromaticity information; According to the brightness distribution characteristics of pixel units in a display area, dynamically dividing a refresh control partition, wherein the refresh control partition comprises: When the maximum brightness requirement in the subarea is lower than or equal to the visually recognizable threshold value, a low-frequency refreshing strategy is activated, and when the maximum brightness requirement is higher than the dynamic range threshold value, the method is switched to a high-frequency refreshing strategy; Applying a visual optimization process for a high frequency refresh zone, comprising: inserting a black frame sequence on the premise of keeping the frame period integrity, wherein the black frame insertion density is inversely related to the real-time brightness level of the subarea; And outputting the driving signals after visual optimization processing to a display system, and updating a database of the aging state factors.
2. The method for controlling an LED display according to claim 1, wherein the method for monitoring the aging state factor comprises: Setting a distributed temperature sensor network on the layout of a display screen PCB, and acquiring local area temperature data; based on a thermal design model of the display screen, a thermal resistance network model from the pixel unit to the nearest temperature sensor is established; calculating the real-time equivalent junction temperature of each pixel unit by using the thermal resistance network model and the local area temperature data read in real time; Accumulating the effective lighting time of each pixel unit; The aging state factor comprises the real-time equivalent junction temperature and the effective luminous time length, and the nonlinear attenuation compensation algorithm takes the real-time equivalent junction temperature as key input.
3. The method for controlling an LED display according to claim 1, wherein the nonlinear attenuation compensation algorithm uses a multivariate regression model, and the input vector is a normalized combination of the historical effective light emitting time length and the real-time equivalent junction temperature, and the output is a brightness compensation coefficient.
4. The method for controlling an LED display according to claim 1, wherein the refresh policy switching process employs a gradual smoothing mechanism, comprising: The refresh rate is limited to below the threshold of human eye persistence of vision, and the brightness output variation curve satisfies the constraint of monotonic continuity.
5. The method of claim 1, wherein the method of color space conversion compensation comprises: And searching a compensation matrix in a pre-stored color gamut mapping table according to the real-time heat load parameters, and carrying out color coordinate correction on the compensated brightness signals by matrix multiplication.
6. The method according to claim 1, wherein the refresh control partition is dynamically generated based on image content characteristics, and comprises performing independent partition control on an image area having a brightness distribution gradient exceeding a set threshold, and wherein the partition boundary is dynamically updated as the image content changes.
7. The method for controlling an LED display according to claim 1, wherein the method for performing content type recognition comprises: and when the static content is identified, enabling the regional time-sharing refresh optimization strategy.
8. The method of claim 6, wherein the step of performing timing interleaving control on adjacent refresh control sections comprises: The black frame inserting time sequence of each partition is in non-overlapping distribution in the frame period, and the refresh phase difference between the partitions maintains a fixed proportion relation.
9. The method for controlling an LED display screen according to claim 1, further comprising an ambient light adaptive compensation system: and continuously acquiring the environmental optical parameters through the high dynamic range light sensor, inputting the environmental optical parameters into the compensation decision system, and executing triple dynamic adjustment.
10. A control display screen for an LED display screen, the control display screen comprising: A first obtaining unit for obtaining original luminance data and chrominance information; the second obtaining unit is used for obtaining an aging state factor according to the original brightness data and the chromaticity information; a third obtaining unit for obtaining a brightness compensation coefficient according to the aging state factor; A fourth obtaining unit for obtaining a compensated luminance signal according to the luminance compensation coefficient; The fifth obtaining unit is used for obtaining the maximum brightness requirement in the subarea according to the compensated brightness signal; The first judging unit is used for judging whether the maximum brightness requirement in the partition is higher than a dynamic range threshold value, and switching to a high-frequency refreshing strategy when the maximum brightness requirement in the partition is higher than the dynamic range threshold value; and the sixth obtaining unit is used for obtaining the driving signal after the visual optimization processing according to the high-frequency refreshing strategy.

Description

Control method of LED display screen and display screen Technical Field The application relates to the technical field of display control, in particular to a control method of an LED display screen and the display screen. Background The LED display screen is used as a core carrier for modern information display and is widely applied to the fields of commercial display, public information release and high-end viewing and listening. With the development of display technology to high resolution and high dynamic range, the stability and dynamic image quality of long-term operation of the system become the focus of attention in the industry, and the current mainstream control system still has significant limitations when coping with two general challenges: First, the photoelectric characteristics of the LED pixel cells may deteriorate nonlinearly with service time and environmental conditions. In a long-term continuous working state, the luminous efficiency attenuation of the semiconductor material and the junction temperature rise are in strong correlation, and the attenuation rates of LEDs with different wavelengths are different. The traditional compensation method based on a fixed attenuation curve or a simple linear model is difficult to accurately match with the complex coupling relation between temperature, time and brightness in the actual aging process, so that regional brightness degradation, color coordinate drift and other phenomena occur on the screen. Especially when displaying large-area solid-color backgrounds, the color misalignment and brightness non-uniformity caused by the pixel-level aging difference can significantly reduce the visual uniformity, and the characteristic of accelerated aging in a high-temperature region can further exacerbate the uncontrollable degradation of the display quality. Secondly, the existing refresh rate control mechanism has difficulty in optimizing the high dynamic content performance and the system energy efficiency. In the fixed global refresh rate mode, an ultra-high refresh strategy is often forced to be adopted to meet the definition requirement of high-speed moving images, so that energy consumption of a static display area is reduced, flicker perceivable by human eyes is introduced into a low-gray-scale picture, and otherwise, dynamic blurring artifacts are generated when a high-brightness moving object is presented if low-frequency refresh is adopted to reduce the power consumption. The single refreshing strategy is seriously mismatched with the image content characteristics and the local brightness requirements, so that the visual experience of a high-end display scene is limited, and the energy efficiency improvement of a large-size display screen is also limited. Disclosure of Invention In order to solve the above problems, an embodiment of the present invention provides a method for controlling an LED display screen, including: Analyzing an input image data stream, and extracting original brightness data and chromaticity information of each pixel unit; Dynamically monitoring an aging state factor of the pixel unit; A nonlinear attenuation compensation algorithm is called to generate a brightness compensation coefficient, the nonlinear attenuation compensation algorithm establishes an association mapping between an aging state factor and brightness attenuation degree, and the mapping relation is obtained through training of an LED photoelectric degradation experimental data set; Performing self-adaptive weighted fusion on the original brightness data and the brightness compensation coefficient to generate a compensated brightness signal, and simultaneously performing color space conversion compensation based on the thermal drift characteristic of the chromaticity information; According to the brightness distribution characteristics of pixel units in a display area, dynamically dividing a refresh control partition, wherein the refresh control partition comprises: When the maximum brightness requirement in the subarea is lower than or equal to the visually recognizable threshold value, a low-frequency refreshing strategy is activated, and when the maximum brightness requirement is higher than the dynamic range threshold value, the method is switched to a high-frequency refreshing strategy; Applying a visual optimization process for a high frequency refresh zone, comprising: inserting a black frame sequence on the premise of keeping the frame period integrity, wherein the black frame insertion density is inversely related to the real-time brightness level of the subarea; And outputting the driving signals after visual optimization processing to a display system, and updating a database of the aging state factors. Further, the method for monitoring the aging state factor comprises the following steps: Setting a distributed temperature sensor network on the layout of a display screen PCB, and acquiring local area temperature data; based on a thermal design