Display Luminance Deviation Compensation via Defective Pixel Detection
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Solution Overview
Problem
Existing methods for compensating luminance deviation in display devices are not accurate and fail to effectively detect defective pixels, leading to suboptimal image quality.
Innovation Solution
A method and device that write test pixel data to a display panel, capture images, analyze luminance characteristics, detect defective pixels, and derive compensation data to reduce luminance deviations by interpolating or replacing measured values with neighboring pixel data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods are used to compensate luminance deviation, then the process is simple, but the luminance deviation cannot be accurately compensated and image quality deteriorates
Solution Approach 1:
The patent divides the screen into multiple regions and performs luminance measurement and compensation separately for each region. This segmentation allows accurate detection of local luminance deviations while maintaining a systematic compensation approach that doesn't overly complicate the overall process.
Solution Approach 2:
The patent performs preliminary luminance measurement and defective pixel detection before compensation. By capturing images and analyzing luminance characteristics in advance, the system prepares compensation data that accurately reflects the actual luminance deviation, enabling precise compensation without requiring complex real-time adjustments.
2Measurement precision
If compensation data is derived from all pixels including defective ones, then the process is straightforward, but the luminance deviation compensation becomes inaccurate due to defective pixels
Solution Approach 1:
The patent extracts and identifies defective pixels from the overall pixel set by analyzing luminance characteristics. These defective pixels are then excluded from the compensation data derivation process. This extraction of harmful elements (defective pixels) ensures that compensation data is derived only from normal pixels, improving accuracy without requiring overly complex processing.
Solution Approach 2:
The patent introduces an intermediary step of defective pixel detection and removal between image capture and compensation data derivation. This intermediary process filters out defective pixels before they can corrupt the compensation data, acting as a mediator that protects the overall compensation accuracy while maintaining processing efficiency.
3Measurement precision
If compensation is performed without detecting defective pixels, then the process is fast, but the compensation accuracy deteriorates due to overcompensation of neighboring pixels
Solution Approach 1:
The patent performs preliminary detection of defective pixels and their neighboring regions before compensation. By identifying these areas in advance and adjusting the compensation strategy accordingly, the system avoids overcompensation without requiring complex real-time adjustments during the compensation process itself.
Solution Approach 2:
The patent takes preliminary anti-action by identifying defective pixels and their surrounding areas before compensation occurs. This allows the system to pre-adjust the compensation parameters for these regions, preventing the harmful effect of overcompensation before it happens, thereby maintaining both accuracy and efficiency.
Data Source
AI summary
The present disclosure relates to a method and a device for compensating for a luminance deviation, in which test pixel data is written to pixels disposed on a screen of a display panel and an image of the screen is captured, a luminance deviation is determined by analyzing luminance characteristics based on a measured luminance value of each of the pixels, which is obtained from data of the image of the screen captured by an imaging device, and a defective pixel is detected, and compensation data for reducing the luminance deviation between the pixels is derived for each pixel, so that a measured luminance value or compensation data of the defective pixel can be removed.