Display Device Random Coordinate Initialization for After-Image Reduction
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Solution Overview
Problem
Display devices, such as OLED and LCD, experience after-image issues due to pixel circuit degradation over time, and existing methods to reduce this by shifting the image display reference coordinate are less effective when the device is powered back on after shutdown, as they often reset to a fixed start coordinate, limiting the image display range.
Innovation Solution
Initializing the image display reference coordinate as a random coordinate within a shift pattern when power is applied, allowing the coordinate to shift along the pattern, and processing the input image based on these coordinates to generate and display an output image, which includes scaling and shifting the image to fill any blank regions on the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image display reference coordinate is reset to a fixed start coordinate after power restoration, then the coordinate initialization is simple and deterministic, but the image display reference coordinate may not encompass all of the shift pattern, reducing after-image reduction efficiency
Solution Approach 1:
The patent applies preliminary action by pre-defining a shift pattern that includes multiple coordinates (start coordinate, intermediate coordinates, and end coordinate) before operation. When power is applied or restored, the system selects a starting point within this pre-established pattern rather than always resetting to a fixed coordinate, thereby ensuring comprehensive coverage of the shift pattern for effective after-image reduction.
2Reliability
If the image display reference coordinate shifts periodically to reduce pixel circuit degradation, then after-image reduction is improved, but the image display range may be limited when the coordinate does not encompass the entire shift pattern
Solution Approach 1:
The patent applies dynamics by making the image display reference coordinate movable rather than fixed. The coordinate shifts along a defined shift pattern that spans the entire display area, ensuring that the dynamic coordinate traversal covers all regions of the display panel. This dynamic shifting prevents pixel circuit degradation while maintaining full image display range through comprehensive coordinate coverage.
Data Source
AI summary
A method of operating display device includes initializing an image display reference coordinate as a random coordinate among coordinates included in a shift pattern when power is applied to the display device, shifting the image display reference coordinate from the random coordinate along the shift pattern, and displaying an input image to a display panel included in the display device based on the image display reference coordinate.