Light Emitting Display Pixel Compensation by Excluding Upper Values
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Solution Overview
Problem
Abnormal pixels in light emitting display panels result in reduced luminance and smeared images due to insufficient compensation of data voltage differences, with large compensation value differences leading to inadequate compensation for pixels with minor abnormalities.
Innovation Solution
A light emitting display apparatus calculates final compensation values for abnormal pixels by excluding upper compensation values within a predetermined percentage, using only lower compensation values to compensate the input image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If compensation values are increased to compensate for abnormal pixels with large luminance differences, then luminance compensation for severely abnormal pixels is improved, but compensation for abnormal pixels with small degree of abnormality becomes insufficient
Solution Approach 1:
The patent applies different compensation strategies to different groups of abnormal pixels based on their specific luminance characteristics. By dividing abnormal pixels into multiple groups according to their luminance levels and applying differentiated compensation values, the system achieves locally optimized compensation that addresses both severely abnormal and mildly abnormal pixels appropriately, rather than using a uniform compensation approach
Solution Approach 2:
The patent uses a two-stage compensation approach where first compensation values are applied to all abnormal pixels, and then second compensation values are selectively applied to specific groups. This partial action approach ensures that pixels with small degree of abnormality receive appropriate compensation without being over-compensated, while pixels with large luminance differences receive additional compensation through the second stage
2Device complexity
If a single compensation value is used for all abnormal pixels, then the compensation process is simple, but pixels with different degrees of abnormality cannot be adequately compensated
Solution Approach 1:
The patent changes the compensation parameter strategy by introducing multiple compensation values (first compensation values and second compensation values) instead of a single compensation value. By adjusting compensation parameters based on luminance level groups, the system maintains computational feasibility while significantly improving display quality consistency across different types of abnormal pixels
3Illumination intensity
If compensation values are set to ensure adequate compensation for all abnormal pixels, then luminance uniformity is improved, but the risk of over-compensation and image distortion increases
Solution Approach 1:
The patent implements a feedback mechanism by measuring the actual luminance levels of abnormal pixels and using this information to determine appropriate compensation values. By basing compensation on actual measured luminance characteristics rather than uniform assumptions, the system achieves luminance uniformity while avoiding over-compensation that would cause image distortion or smearing
Data Source
AI summary
A light emitting display apparatus includes a light emitting display panel having normal pixels and abnormal pixels, a control driver configured to receive input image data of the normal pixels and the normal pixels and convert the input image data into image data, and a data driver configured to output data voltages corresponding to the image data to the normal pixels and the abnormal pixels. Compensation values for compensating the input image data of the abnormal pixels are stored in the control driver. The control driver calculates final compensation values for the abnormal pixels by using lower compensation values excluding upper compensation values included in an upper K % of the compensation values, and compensates the input image data of the abnormal pixels by using the final compensation values.