Display Panel Grayscale Calibration for Watermark and Contrast Control
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Solution Overview
Problem
Current gamma voltage adjustment methods for display panels fail to differentiate between sub-pixel colors, leading to reduced adjustment accuracy and a noticeable decrease in contrast when attempting to remove watermarks in displayed screen images.
Innovation Solution
A grayscale calibrating method that differentiates between first and second sub-pixels of different colors by adjusting the white balance component of the first sub-pixels in abnormal display regions, thereby enhancing the display effect without affecting the second sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If gamma voltage adjustment is applied to all RGB sub-pixels to remove watermarks, then the watermark issue is improved, but the contrast of the displayed screen image is reduced
Solution Approach 1:
The patent segments the adjustment process by sub-pixel type and display region. It identifies different sub-pixel colors (first sub-pixels and second sub-pixels) and applies different grayscale adjustment strategies to each, rather than uniformly adjusting all RGB sub-pixels. This segmentation allows selective adjustment of only those sub-pixels contributing to the watermark effect, preserving contrast in other regions.
Solution Approach 2:
The patent implements local quality adjustment by identifying abnormal display regions where watermarks occur and applying grayscale adjustments only to first sub-pixels within those specific regions. The adjustment magnitude is locally adapted based on the watermark severity and sub-pixel characteristics, rather than applying global gamma voltage adjustment across the entire display.
2Object-affected harmful factors
If gamma voltage adjustment is increased to improve watermark removal, then the watermark issue is better addressed, but the adjustment accuracy is reduced
Solution Approach 1:
The patent segments the adjustment process by sub-pixel type and display region. It identifies different sub-pixel colors (first sub-pixels and second sub-pixels) and applies different grayscale adjustment strategies to each, rather than uniformly adjusting all RGB sub-pixels. This segmentation allows selective adjustment of only those sub-pixels contributing to the watermark effect, preserving contrast in other regions.
Solution Approach 2:
The patent implements local quality adjustment by identifying abnormal display regions where watermarks occur and applying grayscale adjustments only to first sub-pixels within those specific regions. The adjustment magnitude is locally adapted based on the watermark severity and sub-pixel characteristics, rather than applying global gamma voltage adjustment across the entire display.
Data Source
AI summary
The present application provides a grayscale calibrating method for a display panel and a display device. The grayscale calibrating method for a display panel includes obtaining a screen image to be displayed of the display panel, and determining whether the screen image to be displayed exists in an abnormal display region; when the screen image to be displayed exits in the abnormal display region, increasing the grayscale of each of the first sub-pixels located in the first display region by changing a white balance component to improve the display effect of the abnormal display region.