Display Brightness Compensation via Temperature-Adaptive Backlight Control
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Solution Overview
Problem
Large-sized display devices face issues with brightness non-uniformity due to non-uniform electrical properties of Thin Film Transistors (TFTs) and backlight modules, which are exacerbated by temperature variations affecting liquid crystal layers.
Innovation Solution
A method and apparatus that acquire ambient temperature and display data information, determine compensation information, and adjust backlight driving signals and display data to ensure uniform brightness across the display device, using a processor to establish and store correspondence relationships between temperature and display data to calculate compensation coefficients for gray-scale values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If backlight-driven local dimming is applied to control backlight brightness, then power consumption is reduced and contrast is improved, but brightness uniformity of the display module deteriorates
Solution Approach 1:
The patent divides the display screen into multiple regions and applies different compensation coefficients to each region based on its specific characteristics. This local quality approach allows each region to be optimized independently, maintaining brightness uniformity while enabling local dimming for power savings.
Solution Approach 2:
The patent dynamically adjusts the backlight driving signals by changing parameters such as duty cycle and pulse width based on detected temperature and brightness uniformity data. This parameter change strategy enables real-time optimization of both power consumption and brightness uniformity.
2Illumination intensity
If temperature variations affect liquid crystal layers, then display quality deteriorates due to brightness non-uniformity, but adding compensation mechanisms increases device complexity
Solution Approach 1:
The patent implements a feedback mechanism where temperature sensors and brightness detectors continuously monitor the display conditions, and the processor automatically adjusts backlight driving signals based on this feedback. This closed-loop control maintains brightness uniformity without requiring complex manual compensation mechanisms.
Solution Approach 2:
The system performs self-compensation by automatically detecting temperature variations and brightness non-uniformity, then adjusting its own operating parameters without external intervention. This self-service approach simplifies the overall device complexity while maintaining display quality.
3Speed
If compensation information is determined through lookup tables, then processing speed is improved, but memory requirements and initial calibration complexity increase
Solution Approach 1:
The patent pre-calculates and stores compensation coefficients in lookup tables during the manufacturing calibration process. This preliminary action allows the system to quickly retrieve and apply compensation values during operation, achieving fast processing while the initial complexity is confined to the manufacturing stage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively adjusts the brightness of the display device at different temperatures, ensuring uniformity and improving display quality by compensating for temperature-induced variations in liquid crystal layers.
Implementation Method 1
temperature variations affecting liquid crystal layers
Data Source
AI summary
The present disclosure proposes a method and apparatus for compensating for brightness of a display device. The method for compensating for the brightness comprises: acquiring ambient temperature information and display data information of the display device; determining compensation information corresponding to the acquired ambient temperature information and the acquired display data information; and compensating for backlight driving signals and/or the display data information of the display device according to the compensation information to adjust the brightness of the display device.