Matrix Display Defect Masking via Human Vision Modeling
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Solution Overview
Problem
Matrix-based electronic display technologies suffer from image quality deficiencies due to defective pixels or sub-pixels, which are often visible and can lead to incorrect image interpretation, especially in high-fidelity applications like medical imaging, and existing solutions require trial and error or rely on redundant sub-pixels.
Innovation Solution
A method and system that utilize a representation of the human vision system to characterize defects and derive drive signals for non-defective pixels to minimize the visual impact of defects, adjusting light output values to match or closely resemble the output of defective sub-pixels, thereby reducing the visibility of defects without the need for redundant sub-pixels or trial and error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel defects are left uncorrected in matrix displays, then device complexity remains low, but image quality and reliability deteriorate significantly
Solution Approach 1:
The patent introduces an intermediary processing layer between the display hardware and the viewer's eye. This layer includes a defect detection module that identifies defective pixels and a compensation module that adjusts the luminance of surrounding pixels. The compensation module acts as a mediator, distributing the defect's visual impact across multiple functioning pixels, thereby reducing the visibility of individual defects without requiring physical replacement of defective components.
Solution Approach 2:
The patent changes the luminance parameter of surrounding pixels to compensate for defective pixels. By dynamically adjusting the drive signals to neighboring pixels based on the detected defect characteristics, the system modifies the display parameters to mask the visual impact of defects. This parameter adjustment approach maintains reliability without adding complex physical structures.
2Reliability
If redundant sub-pixels are added to mask defects, then image quality improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of adding physical redundant sub-pixels during manufacturing, the patent creates virtual copies of the defect's visual impact through software-based compensation. The system detects the defect's luminance characteristics and generates compensatory signals that replicate the appearance of functioning pixels, effectively copying the desired visual output without requiring additional physical components. This approach maintains ease of manufacture while improving defect masking.
3Adaptability or versatility
If trial and error methods are used to correct pixel defects, then adaptability to different defect types improves, but time consumption and productivity decrease
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors pixel performance, detects defects, and automatically adjusts compensation parameters in real-time. The defect detection module provides feedback about defective pixel characteristics, and the compensation module uses this feedback to dynamically optimize the masking strategy. This closed-loop approach enables the system to adapt to various defect types automatically without requiring manual trial and error adjustment, thereby maintaining high productivity.
Solution Approach 2:
The patent performs preliminary defect detection and characterization during the display initialization phase or during idle periods, before the display is actively used. By pre-identifying and pre-compensating for defects, the system eliminates the need for time-consuming trial and error adjustments during actual operation. This preliminary action ensures that defect correction is already optimized when the display is needed, maintaining both adaptability and productivity.
Data Source
AI summary
The present invention provides a method for reducing the visual impact of defects present in a matrix display comprising a plurality of pixels, said pixels comprising at least three sub-pixels, each sub-pixel intended for generating a sub-pixel color which cannot be obtained by a linear combination of the sub-pixel colors of the other sub-pixels of the pixel, the method comprising: providing a representation of a human vision system, characterizing at least one defect sub-pixel present in the display, the defect sub-pixel intended for generating a first sub-pixel color, the defect sub-pixel being surrounded by a plurality of non-defective sub-pixels, deriving drive signals for at least some of the plurality of non-defective sub pixels in accordance with the representation of the human vision system and the characterizing of the at least one defect sub-pixel, to thereby minimize an expected response of the human vision system to the defect sub-pixel, and driving at least some of the plurality of non-defective sub-pixels with the derived drive signals, wherein minimizing the response of the human vision system to the defect sub-pixel comprises changing the light output value of at least one non-defective sub-pixel for generating another sub-pixel color, said another sub-pixel color differing from said first sub-pixel color. The present invention also provides a corresponding system for reducing the visual impact of defects present in a matrix display, and a matrix display with reduced visual impact of defects present in the display.