Display Luminance Compensation via Offset Mapping
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Solution Overview
Problem
Display devices often exhibit luminance deviations due to variations in manufacturing processes, leading to inconsistent image quality and potential distortions like mura, where the same data signal results in different luminance levels across display pixels.
Innovation Solution
A method and apparatus for compensating luminance in display devices by capturing an image of a test display, generating imaging data, mapping luminance values to center the maximum luminance value within a unit mapping area, calculating a representative luminance value, and setting a luminance correction value to compensate for deviations, which is then used to generate compensation image data and correct display pixel luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If luminance values are mapped directly based on position codes without centering adjustment, then mapping simplicity is maintained, but luminance uniformity deteriorates due to spot effects and manufacturing variations
Solution Approach 1:
The patent applies preliminary action by performing offset calculation and luminance value reassignment before final mapping. The controller calculates the offset between the center of gravity of luminance values and the center of the unit mapping area, then reassigns luminance values to corrected positions before generating the compensation image signal. This preliminary correction ensures luminance uniformity is achieved in the final display.
2Manufacturing precision
If the maximum luminance value is positioned at the center of the unit mapping area through offset adjustment, then luminance distribution uniformity is improved, but processing time increases due to additional calculation steps
Solution Approach 1:
The patent replaces complex iterative mechanical adjustment methods with a direct mathematical calculation approach. Instead of repeatedly adjusting and testing luminance positions, the system calculates the offset directly using the center of gravity formula, determining the exact position correction needed in a single computational step. This substitution of mechanical iteration with mathematical calculation significantly reduces processing time while achieving precise luminance uniformity.
3Measurement precision
If multiple mapping adjustments are performed to correct luminance deviations, then compensation accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent extracts and corrects only the essential offset component causing luminance non-uniformity, rather than performing multiple comprehensive adjustments. By identifying and correcting specifically the positional offset between the luminance center of gravity and the unit mapping area center, the system achieves effective compensation with minimal computational operations, avoiding unnecessary complex calculations.
Data Source
AI summary
A method for compensating luminance of a display device according to some embodiments of the present disclosure includes capturing an image of the display device, generating imaging data, primarily mapping display pixels of the display device and the imaging data so that a unit mapping area corresponding to the display pixels includes luminance values for image pixels of an imaging device, setting an offset value of the imaging data with respect to the display pixels so that a maximum luminance value among the luminance values is positioned at a center of the unit mapping area, secondarily mapping the imaging data according to the offset value with respect to the display pixels, calculating a representative luminance value, and setting a luminance correction value corresponding to the representative luminance value with respect to one of the display pixels.