Display Panel Calibration via Color Space Crosstalk Correction
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Solution Overview
Problem
Current display calibration methods require complex circuitry and are not accurate due to cross-talk issues, where the output of one sub-pixel is influenced by other sub-pixels, leading to errors in color reproduction.
Innovation Solution
A method involving non-linear transformations for color space conversion and cross-talk correction, using Adjusted Average Picture Level (AAPL) to dynamically adjust parameters, and blending gammas to correct for cross-talk without adding circuitry, allowing for simpler and more accurate calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex circuitry is used for display calibration, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the cross-talk correction function from complex hardware circuitry and implements it through software-based color space conversion operations. By separating the correction logic from dedicated hardware, the system achieves accurate cross-talk compensation without adding physical complexity to the display device.
Solution Approach 2:
The patent replaces physical calibration hardware with computational methods. Instead of using additional circuitry to measure and correct cross-talk, the system uses color space conversion algorithms that mathematically compensate for cross-talk effects, substituting mechanical/electrical systems with information-processing approaches.
2Manufacturing precision
If cross-talk correction is implemented, then color accuracy is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent makes the display driver circuitry multi-functional by having it perform both the standard gamma correction and the cross-talk correction through integrated color space conversion. This universal approach allows a single circuit to handle multiple calibration functions without requiring separate dedicated hardware for each correction type.
Solution Approach 2:
The patent achieves cross-talk correction by transforming color signal parameters through color space conversion rather than physically adjusting display parameters. By changing the mathematical representation of color values and applying conversion matrices, the system corrects cross-talk effects without requiring physical recalibration of the display hardware.
3Adaptability or versatility
If polynomial color space converters are used, then adaptability is improved, but ease of operation worsens
Solution Approach 1:
The patent segments the color space conversion process into distinct matrix multiplication operations for different color components. By breaking down the complex polynomial conversion into separate, manageable matrix operations that can be applied independently to red, green, and blue channels, the system maintains adaptability while improving programmability and ease of implementation.
Data Source
AI summary
A method of calibrating a display panel includes making measurements of color components produced by the display panel, receiving an input image signal consisting of one or more pixel represented by input color component values, applying a first non-linear transform to the input color component values of the pixel to produce transformed color component values, wherein the first non-linear transform is either based upon the measurements and the panel design or a ratio of values of color components based upon the measurements, applying a crosstalk correction transform to the transformed color component values to produce crosstalk corrected color component values, applying a second non-linear transform to the crosstalk corrected color component values to produce final color component values, and sending the final color component values to the display panel. A method of calibrating a display panel, includes making measurements of color components displayed on the display panel, using the measurements to generate at least one non-linear crosstalk correction transform, receiving an input image signal consisting of one or more pixel represented by input color component values, changing parameters used in the at least one crosstalk correction transform based upon a current of the panel, and applying one of the at least one crosstalk correction transform having parameters that are a closest fit to the measurements.