Mura Compensation Data Compression Using Spatial Frequency Separation
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Solution Overview
Problem
Display panels exhibit luminance non-uniformity (mura) due to process deviations and electrical signal noise, necessitating increased data size for compensation, which is inefficient as panels and driving circuits become more integrated.
Innovation Solution
A mura compensation data generation device generates optical information for pixels, extracts high and low spatial frequency components, and compresses them using different algorithms, storing the compressed data in an external circuit to minimize data size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mura compensation data is stored in full resolution for all pixels, then compensation precision is improved, but data storage capacity increases
Solution Approach 1:
The patent divides the mura compensation data into two distinct segments: low spatial frequency components (representing overall luminance trends) and high spatial frequency components (representing fine detail variations). This segmentation allows each component to be processed and stored with appropriate precision, reducing total data requirements while maintaining compensation accuracy.
Solution Approach 2:
The patent applies different storage strategies to different spatial frequency components based on their characteristics. Low spatial frequency data, which varies smoothly across the display, can be compressed more aggressively, while high spatial frequency data requiring finer precision is handled differently. This local quality approach optimizes the balance between data size and compensation precision for each component type.
2Volume of moving object
If display panels and driving circuits are integrated, then device compactness is improved, but data size for mura compensation increases
Solution Approach 1:
The patent extracts only the essential components needed for mura compensation by separating spatial frequency information. Instead of storing complete high-resolution compensation data for all pixels, the system extracts and stores only the critical low spatial frequency components that represent the dominant mura patterns, significantly reducing data size while maintaining effective compensation in integrated displays.
Data Source
AI summary
A method performed by a mura compensation data generation device, the method includes: generating optical information for a plurality of pixels of a display panel operating based on test data; generating, based on the optical information, raw mura compensation data to compensate input video data provided to the display panel; extracting a high spatial frequency component and a low spatial frequency component from the raw mura compensation data; generating a compressed high spatial frequency component, by compressing, based on a first compression algorithm, the high spatial frequency component; generating a compressed low spatial frequency component, by compressing, based on a second compression algorithm, the low spatial frequency component; and storing the compressed high spatial frequency component and the compressed low spatial frequency component in an external storage circuit.