Display Driver Edge Boost Compensation via Color Dilution
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Solution Overview
Problem
Display systems experience visual performance issues due to perceptual bias of edge boost when displaying images with grayscale or gradual color changes, leading to jagged perceived brightness, especially in high-resolution or high-dynamic-range displays.
Innovation Solution
A display driver with an input buffer, image processor, and output buffer that preprocesses input images by detecting significant color changes between adjacent color bands, optimizing transitions through color dilution or frame rate control to compensate for edge boost, and identifying intermediate transition regions for smoother transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display panel displays high-resolution or high-dynamic-range images with grayscale patterns, then the image quality and contrast are improved, but the perceptual bias of edge boost causes jagged appearance and visual performance degradation
Solution Approach 1:
The patent applies preliminary action by pre-processing the input image to identify transition regions and predict edge boost effects before displaying the image. The display driver IC performs edge boost prediction and generates compensation data in advance, which is then used to adjust the display output and eliminate jagged artifacts.
Solution Approach 2:
The patent implements feedback by using the predicted edge boost information to dynamically adjust the display output. The system feeds back the edge boost prediction results to modify the compensation data, creating a closed-loop control mechanism that continuously optimizes the displayed image to counteract perceptual bias.
2Reliability
If the display driver IC processes images with gradual color changes, then the visual performance can be improved, but the processing complexity and computational load increase
Solution Approach 1:
The patent applies local quality by focusing processing efforts only on transition regions where color changes occur, rather than processing the entire image uniformly. The system identifies specific transition regions and applies edge boost prediction and compensation only to these localized areas, reducing overall processing complexity while maintaining visual performance.
Solution Approach 2:
The patent implements segmentation by dividing the image processing into distinct stages: transition region identification, edge boost prediction, compensation data generation, and final display output. This segmented approach allows each processing stage to be optimized independently, managing computational load effectively.
3Measurement precision
If the display system displays images with significant color changes, then the color accuracy is improved, but the transition regions appear jagged due to edge boost perception
Solution Approach 1:
The patent applies preliminary anti-action by predicting edge boost effects and generating compensation data before the jagged artifacts can appear. The system preemptively adjusts the display output in transition regions to counteract the perceived edge enhancement, thereby preventing jagged appearance while preserving color accuracy.
Solution Approach 2:
The patent introduces an intermediary mechanism by using compensation data as a mediator between the original image and the final display output. This compensation data acts as an intermediate layer that smooths transitions in perceptual color space, resolving the conflict between color accuracy and transition smoothness.
Data Source
AI summary
A method and a display driver for compensating the perceptual bias of edge boost when driving a display panel are provided. The method can pre-process an input image to compensate for a perceptual bias of edge boost, e.g., at a contiguous group of color bands in the input image prior to sending the input image in a form of plural frames to a display panel for display. The method includes the steps of partitioning an input image into one or more grayscale regions, segmenting the grayscale regions into a plurality of color bands, detecting a subtle but perceivably significant change of color or luminance between two adjacent color bands, identifying a transition region and performing color dilution on the transition region. The display driver can include an input buffer, an image processor configured to execute the above method and an output buffer.