Display Device Correction Data Generation for Maximum Gray Level Mura
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Solution Overview
Problem
Display devices face challenges in correcting luminance and color mura defects at maximum gray levels, as existing methods cannot generate correction data for these levels, leading to unresolved mura issues.
Innovation Solution
A method is developed to generate correction data by obtaining measured tristimulus data at maximum gray levels, determining target luminance and color coordinate profiles, and storing correction data in the display device, ensuring that red, green, and blue luminance values are adjusted to match or be lower than measured maximum luminance levels, thereby correcting mura defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If correction data is generated using existing methods, then correction data can be obtained for gray levels below maximum, but correction data cannot be generated at maximum gray level
Solution Approach 1:
The patent changes the parameter of gray level from below-maximum to maximum gray level, enabling correction data generation at the previously uncorrectable maximum gray level while maintaining accuracy for all other levels through a unified correction framework
Solution Approach 2:
The correction data generation method is made universal to work across all gray levels including maximum gray level, allowing a single correction algorithm to handle the entire gray level range from minimum to maximum
2Device complexity
If correction data is generated without considering maximum luminance constraints, then correction processing is simpler, but luminance loss occurs and display uniformity deteriorates
Solution Approach 1:
The patent introduces maximum luminance constraints as a new parameter that limits correction values to ensure corrected luminance does not exceed measured maximum luminance, thereby preventing luminance loss while maintaining display uniformity
Solution Approach 2:
The correction data generation uses measured luminance and color coordinate data as feedback to adjust correction values, ensuring that corrections at maximum gray level do not cause luminance loss and maintain display uniformity across all pixels
3Ease of operation
If correction values are allowed to exceed maximum luminance, then correction processing is more flexible, but luminance loss occurs and color accuracy deteriorates
Solution Approach 1:
The patent changes the constraint parameter for correction values by introducing maximum luminance limits, ensuring correction values are adjusted to match or be lower than measured maximum luminance levels, thereby maintaining color accuracy and preventing luminance loss
Solution Approach 2:
Measured color coordinate data provides feedback to adjust correction values, ensuring that corrections maintain accurate color coordinates while respecting luminance constraints, thereby preserving color accuracy in the corrected display
Data Source
AI summary
In a method of generating correction data for a display device, measured tristimulus data at a maximum gray level are obtained, measured luminance and color coordinate profiles are obtained based on the measured tristimulus data, a target color coordinate profile is determined based on the measured color coordinate profile, measured red, green and blue maximum luminances of each pixel are obtained, a maximum target luminance of the each pixel is determined such that red, green and blue luminances of the each pixel become lower than or equal to the measured red, green and blue maximum luminances, respectively, a final target luminance profile is determined based on the measured luminance profile and the maximum target luminance of the each pixel, and correction data may be generated and stored in the display device based on the final target luminance profile and the target color coordinate profile.