Point Defect Compensation in Electronic Displays
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Solution Overview
Problem
Defective display pixels on electronic display panels can cause visual errors and image artifacts, leading to inefficient and costly replacements, as they result in incorrect color perception and image quality issues.
Innovation Solution
The implementation of image processing circuitry that identifies defective pixels and distributes their target luminance to surrounding non-defective pixels using a compensation mask, effectively concealing the defect by adjusting the light emission of nearby pixels based on the pixel arrangement and image content features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If defective display pixels are replaced by replacing entire display panels, then image quality is improved, but manufacturing cost and time consumption increase
Solution Approach 1:
The patent segments the display panel into individual pixels and applies compensation to only the defective pixels rather than replacing the entire panel. The image processing circuitry identifies defective pixels and redistributes their luminance to surrounding non-defective pixels, achieving localized correction that maintains manufacturing efficiency while improving image quality.
Solution Approach 2:
The patent changes the luminance parameter of surrounding non-defective pixels to compensate for defective pixels. By adjusting the brightness values of adjacent pixels based on a compensation mask, the system corrects visual errors without physical replacement, thereby improving image quality while maintaining manufacturing productivity.
2Productivity
If defective display pixels are compensated using image processing, then manufacturing efficiency is improved, but visual errors may remain noticeable
Solution Approach 1:
The patent applies local quality compensation by creating a compensation mask that targets specific defective pixels and their surrounding areas. The compensation parameters are locally adjusted based on the spatial distribution of defective pixels and the characteristics of surrounding non-defective pixels, ensuring that compensation is applied precisely where needed to minimize visual errors while maintaining overall image quality.
3Manufacturing precision
If compensation parameters are optimized based on pixel arrangement and image features, then image quality is improved, but processing complexity increases
Solution Approach 1:
The patent performs preliminary identification and classification of defective pixels during the compensation process. The image processing circuitry first identifies defective pixels, determines their types (dark, bright, or color-defective), and then applies appropriate compensation strategies. This preliminary action simplifies the overall processing by organizing the compensation workflow into manageable stages.
Solution Approach 2:
The patent implements dynamic compensation by adjusting compensation parameters based on the specific characteristics of each defective pixel and its surrounding environment. The compensation mask is dynamically generated considering pixel arrangement patterns (such as pentile or RGB layouts) and image content features, allowing the system to adapt to different display configurations and image types without requiring complex fixed algorithms.
Data Source
AI summary
An electronic device may display image content via an electronic display by controlling light emission from display pixels of the electronic display. A processor of the electronic device may receive image data destined for a defective display pixel (e.g., dim pixel, dead pixel). The processor may convert a gray level of the image data into a luminance domain to generate a target luminance that would have been emitted by the defective display pixel had the display pixel not been defective. After selecting a compensation mask, the processor may distribute the target luminance of the defective display pixels to nearby non-defective pixels of the electronic display to conceal the presence of the defective display pixel.