Display Mura Compensation with Dynamic Reference-Pixel Weights
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices exhibit nonuniform pixel luminance, resulting in visible mura stains despite strict manufacturing conditions, which existing technologies fail to adequately address.
Innovation Solution
A mura compensation device and system that includes a first memory, a second memory, and a compensator, which generate and apply grayscale compensation values and weights to adjust grayscale data based on pixel characteristics and panel states to compensate for luminance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If grayscale compensation is applied to all pixels uniformly, then manufacturing precision is improved, but luminance uniformity deteriorates due to individual pixel variations
Solution Approach 1:
The patent divides the display panel into multiple reference pixels (e.g., 4×4 blocks) and calculates separate grayscale compensation values for each reference pixel based on its local luminance characteristics. This local compensation approach accounts for spatial variations in pixel performance while maintaining manufacturing precision.
Solution Approach 2:
The patent segments the compensation process into multiple stages: measuring luminance of reference pixels, calculating compensation values for each segment, and applying weights to different reference pixels. This segmentation allows detailed local compensation without requiring individual pixel-level processing.
2Stability of the object's composition
If detailed grayscale compensation values are generated for each reference pixel, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple reference pixel compensation values into a single compensation frame by applying weights to each reference pixel's compensation value. This merging reduces the overall data structure complexity while preserving the benefits of local compensation through the weighted combination.
Solution Approach 2:
The patent applies partial compensation by selecting only certain reference pixels (e.g., corner pixels) to receive full compensation weights while others receive reduced weights. This partial action approach reduces the complexity of calculating and storing compensation values for all pixels while maintaining effective luminance uniformity.
3Ease of operation
If fixed compensation weights are applied to all reference pixels, then ease of operation is improved, but compensation accuracy deteriorates due to different defective states
Solution Approach 1:
The patent implements dynamic weight adjustment where compensation weights for reference pixels are modified based on detected defective states. The system automatically adjusts weights for reference pixels exhibiting mura or other defects, enabling accurate compensation across different panel conditions while maintaining ease of operation through automated detection and adjustment.
Solution Approach 2:
The system incorporates feedback mechanisms where luminance measurements from reference pixels inform the adjustment of compensation weights. The compensator uses measured luminance values to dynamically adjust weights, creating a closed-loop system that maintains compensation accuracy across varying panel states without requiring manual intervention.
Data Source
AI summary
A mura compensation device includes a first memory which stores a grayscale compensation value of a reference pixel defined by m×n pixels included in a display panel, and a weight, where each of m and n is a positive integer equal to or greater than 2, a second memory which receives the grayscale compensation value from the first memory and stores the grayscale compensation value, and a compensator which applies the grayscale compensation value and the weight to grayscale data to generate compensated grayscale data. The compensator applies an individual weight to the weight depending on a normal state or defective states of the display panel to adjust the weight.