Mura Compensation via DeMura Table Decompression and Upsampling
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Solution Overview
Problem
Mura defects on display panels, caused by non-uniform brightness regions due to manufacturing and assembly errors, impede panel performance and user experience.
Innovation Solution
A method and image processing device for Mura compensation, involving decompression and upsampling of a compressed DeMura table to generate a reconstructed table, which is used for compensation on the display panel, utilizing a decompression circuit, upsampling circuit, and compensation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a full-resolution DeMura table is stored for Mura compensation, then Mura compensation precision is improved, but storage memory requirements increase
Solution Approach 1:
The patent extracts only the essential low-frequency components of the DeMura table using downsampling, separating the critical compensation data from the redundant high-frequency details. This allows storing a compressed version that retains the most important Mura defect correction information while significantly reducing memory usage.
Solution Approach 2:
The patent performs preliminary downsampling and compression of the DeMura table before storage. By pre-processing the full-resolution table into a compressed format that captures the essential compensation data, the system prepares the information in advance for efficient storage and retrieval during display operation.
2Quantity of substance
If a compressed DeMura table is stored to reduce memory usage, then storage memory is reduced, but Mura compensation precision deteriorates
Solution Approach 1:
The patent transforms the compressed DeMura data into the spatial domain through upsampling operations, converting it back into a usable compensation table format. This dimensional transformation restores the compensation data to a form that can be applied across the display panel while maintaining the benefits of compressed storage.
Solution Approach 2:
The patent changes the resolution parameter of the DeMura table dynamically - storing at low resolution for memory efficiency and reconstructing at high resolution for compensation precision. By adjusting the resolution parameter between storage and operation phases, the system achieves both memory savings and accurate Mura compensation.
3Measurement precision
If Mura compensation is performed without compression, then Mura compensation precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the Mura compensation process into distinct functional modules: a compression unit that downsamples the DeMura table for storage, and a reconstruction unit that upsamples the compressed data for compensation. This segmentation allows each module to perform its specific function efficiently, reducing overall device complexity while maintaining compensation precision.
Solution Approach 2:
The patent uses copying techniques to reconstruct the high-resolution DeMura table from its compressed low-resolution version. By creating a reconstructed copy of the compensation data through upsampling operations, the system achieves full-resolution compensation precision without requiring storage of the original large-scale table.
Data Source
AI summary
A method and an image processing device for mura detection on a display are proposed. The method includes the following steps. A compressed DeMura table corresponding to the display panel is obtained. Decompression is performed on the compressed DeMura table to generate a decompressed DeMura table. Upsampling is performed on the decompressed DeMura table to generate a reconstructed DeMura table. Mura compensation is performed on the display panel based on the reconstructed DeMura table.