Display Mura Correction Using Segmented Reference and Spot Memories
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face inefficiencies in correcting mura (non-uniformity) issues, particularly in liquid crystal display (LCD) and organic light emitting display (OLED) technologies, where visual inspection processes struggle to accurately correct manufacturing-induced defects, leading to suboptimal display quality.
Innovation Solution
A display device and method that utilize a first memory for storing mura correcting data corresponding to reference pixels and a second memory for spot-mura correction data, with controllers generating and applying correction data to pixel data based on position and weight values, allowing for efficient correction of both mura in larger pixel arrays and spot-muras in individual pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single memory stores all correction data for both mura and spot-mura, then memory coverage is complete, but memory size becomes excessively large
Solution Approach 1:
The patent divides the correction data storage into two separate memories: a first memory for storing mura correction data corresponding to reference pixels, and a second memory for storing spot-mura correction data corresponding to individual pixels. This segmentation reduces the memory size required for each individual memory while maintaining comprehensive correction coverage for both mura and spot-mura defects.
2Measurement precision
If correction data is stored for every individual pixel, then correction precision is high, but memory requirements and processing complexity increase
Solution Approach 1:
The patent applies partial correction by using spot-mura correction data only for pixels that have spot-mura defects, while other pixels use mura correction data derived from reference pixels. This approach achieves necessary correction precision without the excessive complexity of processing correction data for every single pixel uniformly.
Solution Approach 2:
The patent uses reference pixels (n×m pixels) to generate mura correction data that represents a group of pixels. Instead of storing and processing correction data for each individual pixel, the system copies the correction characteristics from reference pixels to correct multiple pixels, reducing processing complexity while maintaining correction effectiveness.
3Quantity of substance
If only reference pixel data is used for correction, then memory size is reduced, but localized spot-mura defects cannot be corrected
Solution Approach 1:
The patent segments the correction approach into two parts: mura correction using reference pixel data for general non-uniformity, and spot-mura correction using individual pixel data for localized defects. This segmentation ensures that memory size remains manageable while both types of defects can be corrected with appropriate precision.
Solution Approach 2:
The patent applies different correction strategies to different locations: reference pixel-based correction for general mura areas and spot-mura specific correction for localized defect areas. This local quality approach ensures that each type of defect receives the most appropriate correction method, improving overall manufacturing precision.
Data Source
AI summary
A display device includes: a first memory storing mura correcting data respectively corresponding to a plurality of reference pixels, each of the plurality of reference pixels comprising (n×m) pixels, the mura correcting data configured to correct mura of a reference pixel (‘n’ and ‘m’ are natural numbers being equal to or more than 2); a first correction controller configured to generate mura correcting data of a pixel using the mura correcting data of the reference pixel stored in the first memory; a second memory storing spot correcting data respectively corresponding to a plurality of spot-muras; a second correction controller configured to output the spot correcting data from the second memory based on a position data of the spot-mura; and an operation part configured to correct pixel data of the pixel using the mura correcting data and the spot correcting data of the pixel.