Zone-Based Color Calibration for OLED Display Panels
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Solution Overview
Problem
OLED display panels experience primary color shifts due to inconsistent red, green, and blue brightness ratios across zones, leading to irregular and large color shift regions caused by process drift and environmental conditions.
Innovation Solution
A color calibration device and method that divides the display panel into zones, measures color space values, calculates zone calibration parameters, and generates a calibration table to adjust subpixel data using a ratio circuit and image processing circuit, ensuring accurate color calibration by selecting the appropriate calibration table based on operation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If zone-based calibration parameters are applied to correct primary color shifts, then color accuracy is improved, but device complexity increases due to multiple calibration tables and ratio calculations
Solution Approach 1:
The display panel is divided into multiple zones, each with its own calibration parameters. The calibration table is segmented into multiple entries corresponding to different zones, allowing independent calibration of each zone to correct primary color shifts locally without affecting other zones.
Solution Approach 2:
Different calibration parameters are applied to different zones based on their specific color shift characteristics. Each zone receives customized calibration parameters rather than a uniform calibration approach, enabling localized optimization of color accuracy for each region of the display panel.
2Adaptability or versatility
If multiple calibration tables are maintained for different operation conditions, then adaptability is improved, but device complexity and data storage requirements increase
Solution Approach 1:
The system dynamically selects and switches between different calibration tables based on current operation conditions such as temperature, humidity, and display mode. This dynamic adaptation allows the calibration system to optimize color accuracy for different operating scenarios without requiring all possible calibration tables to be active simultaneously.
Solution Approach 2:
Multiple calibration tables are pre-generated and stored for different operation conditions before actual use. The system prepares calibration data in advance for various scenarios (different temperatures, humidity levels, display modes) so that the appropriate calibration table can be quickly selected and applied when needed, rather than calculating calibration parameters in real-time.
3Measurement precision
If real-time calibration calculations are performed for each subpixel, then color accuracy is improved, but processing time and computational load increase
Solution Approach 1:
Calibration parameters are pre-calculated and stored in calibration tables during manufacturing or setup phases. During normal operation, the system retrieves pre-computed calibration data rather than performing real-time complex calculations for each subpixel, significantly reducing processing time while maintaining high color accuracy.
Solution Approach 2:
Instead of performing complex calibration calculations for each subpixel in real-time, the system uses simplified lookup tables that contain pre-computed calibration values. The calibration process is copied into a format that can be quickly retrieved and applied during operation, trading some computational complexity for faster execution.
Data Source
AI summary
The invention provides a color calibration device, a color calibration method and a calibration table generation method. The color calibration device includes a calibration table circuit, a ratio circuit and an image processing circuit. The calibration table circuit provides a selected calibration table including a plurality of zone calibration parameters. Each of the zone calibration parameters corresponds to a corresponding zone among a plurality of zones of a display panel. The ratio circuit calculates a subpixel calibration parameter corresponding to a current subpixel according to at least one of the zone calibration parameters in the selected calibration table. The image processing circuit calibrates original subpixel data of the current subpixel according to the subpixel calibration parameter to generate calibrated subpixel data of the current subpixel.