Display Panel Edge Gain Control for Afterimage Prevention
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Solution Overview
Problem
Display devices suffer from afterimages in the edge regions due to continuous display of logos or static images, which are not effectively addressed by existing technologies.
Innovation Solution
A display device with a driving controller that adjusts the load in edge regions by applying varying gain values to input image data based on differences in load and motion between frames, using a data driver to convert the corrected signals into data voltages for the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If logos or static images are continuously displayed in the edge region of the display panel, then the display device can maintain consistent image quality and branding visibility, but afterimages remain in the edge region causing visual discomfort
Solution Approach 1:
The patent applies dynamic gain adjustment to the edge region pixels, where the gain value is varied over time based on the difference between current and previous frame data. This dynamic adjustment causes the pixel output to fluctuate, preventing the formation of static afterimages while maintaining branding visibility through controlled gain values.
Solution Approach 2:
The patent applies different gain values specifically to edge region pixels versus center region pixels. The edge region receives a gain-adjusted signal while the center region maintains normal display, allowing localized prevention of afterimages without affecting overall image quality or branding visibility in the center area.
2Object-affected harmful factors
If the gain value is increased to reduce afterimages in the edge region, then afterimage effects are minimized, but the load on the edge region pixels increases causing potential burn-in or degradation
Solution Approach 1:
The patent applies gain adjustment only to the edge region pixels that are prone to afterimages, rather than increasing the load uniformly across all pixels. This partial action selectively addresses the afterimage problem in the edge region while maintaining normal operating conditions for the majority of the display area, thus minimizing overall pixel load and energy consumption.
Solution Approach 2:
The gain adjustment is applied periodically based on frame differences rather than continuously. By detecting changes between frames and applying gain only when necessary, the patent reduces the cumulative load on edge region pixels while still effectively preventing afterimages during periods when they are likely to occur.
3Device complexity
If uniform gain is applied to the entire display panel, then the processing is simple, but the afterimage problem in edge regions is not effectively addressed
Solution Approach 1:
The patent segments the display panel into edge region and center region, applying different processing to each. The edge region receives gain-adjusted signals based on frame differences, while the center region maintains normal display. This segmentation allows effective afterimage prevention in the edge region without unnecessarily complicating the processing of the entire display panel.
Data Source
AI summary
A display device includes: a display panel, which displays an image; a driving controller, which determines a gain reduction region based on input image data input to the display panel, and generates a data signal by correcting the input image data by applying a gain to the input image data to correspond to the gain reduction region; and a data driver, which converts the data signal into a data voltage to output the data voltage to the display panel. The driving controller is configured to generate first, second, and third data signals by correcting first, second, and third input image data input to first, second, and third regions of the display panel by applying first, second, and third gain values to the first, second, and third input image data, respectively.