Display Image Compensation for HDR Color Stability
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Solution Overview
Problem
High-dynamic-range (HDR) displays face instability in color performance due to temperature changes, particularly in liquid crystal display (LCD) panels, as operating temperature increases with brightness, leading to variations in color across different zones of the panel.
Innovation Solution
A display image compensation method that calculates current temperature information based on display time length and pixel data, generates pixel compensation data when temperature variations exceed a preset value, and applies this data to compensate image signals to maintain consistent chroma across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If display brightness is increased to achieve HDR capability, then illumination intensity is improved, but temperature increases causing color performance instability
Solution Approach 1:
The system pre-calculates temperature information based on display time length and pixel data before actual display occurs. Compensation data is generated in advance based on predicted temperature changes, allowing the system to proactively adjust for temperature-induced color shifts before they occur, rather than reacting after temperature changes have already degraded color performance
Solution Approach 2:
The system changes display parameters (pixel data) based on calculated temperature information. By adjusting pixel values according to predicted temperature changes, the system compensates for upcoming color performance degradation, maintaining stable color output despite temperature increases associated with high brightness HDR display
2Illumination intensity
If local dimming algorithm is applied to enhance HDR capability, then illumination intensity is improved, but temperature difference between zones increases causing color performance variation
Solution Approach 1:
The display panel is divided into multiple image zones, each with independent temperature calculation and compensation. The system calculates temperature information separately for different zones based on their specific display time lengths and pixel data, then generates zone-specific compensation data to address local temperature variations caused by local dimming, preventing color performance differences between zones
Solution Approach 2:
Different compensation strategies are applied to different zones based on their local temperature characteristics. Each zone receives customized pixel compensation data tailored to its specific temperature conditions, allowing the system to maintain uniform color performance across the entire panel despite localized temperature differences created by local dimming
3Measurement precision
If temperature sensing circuit is added to measure temperature for compensation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses its own operational parameters (display time length and pixel data) to calculate temperature information without external temperature sensors. By leveraging internally available data to infer temperature effects, the system achieves temperature compensation functionality while avoiding the added complexity and cost of dedicated temperature sensing circuits
Solution Approach 2:
The system uses display time length and pixel data as intermediary variables to represent temperature information. Instead of directly measuring temperature, the system calculates temperature effects through these intermediary parameters that are already available in the display system, eliminating the need for separate temperature measurement hardware
Data Source
AI summary
An electronic device and a display image compensation method thereof are provided. The display image compensation method includes: receiving a first image signal and a second image signal sequentially at different time points, and displaying the first image signal by using a display unit; calculating current temperature information according to a display time length of the first image signal on the display unit and pixel data of the first image signal, and calculating a variation between the current temperature information and reference temperature information; and generating pixel compensation data corresponding to the current temperature information when the variation is greater than a preset value, compensating the second image signal according to the pixel compensation data, and outputting the compensated second image signal to the display unit.