Dynamic Pixel Shift Controller for Display Afterimage Prevention
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Solution Overview
Problem
Display devices, such as liquid crystal and organic light emitting display devices, often experience afterimages due to hysteresis in transistors and LED deterioration, especially when showing still images or images with high grayscale concentration, which affects display quality.
Innovation Solution
A display device and driving method that adjusts the pixel shift range and speed based on the image type, using a shift controller to determine if an image is moving or still, and applying scaling only when necessary to prevent afterimages while maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pixel shift technique is applied to prevent afterimage, then afterimage prevention is improved, but display quality may deteriorate due to image distortion or blurring
Solution Approach 1:
The patent applies different shift ranges dynamically based on image type: a first shift range for moving images and a second (smaller) shift range for still images. This dynamic adjustment prevents afterimages in moving images while maintaining display quality for still images, resolving the contradiction between afterimage prevention and display quality.
Solution Approach 2:
The patent changes the shift range parameter according to image characteristics. By detecting whether an image is static or moving, the system adjusts the shift range parameter accordingly - using a larger range for moving images to prevent afterimages and a smaller range for still images to preserve display quality.
2Reliability
If a large shift range is used for moving images to prevent afterimage, then afterimage prevention is improved, but image distortion may increase
Solution Approach 1:
The system dynamically adjusts the shift range based on image type detection. For moving images, a larger first shift range is applied to effectively prevent afterimages. For still images, a smaller second shift range is used to minimize image distortion while still providing some afterimage prevention benefit.
Data Source
AI summary
A display device includes a shift controller which generates an output image by shifting an input image within a shift range; and pixels which displays the output image. The shift controller sets the shift range to a first range when the input image is a moving image, and sets the shift range to a second range smaller than the first range when the input image is a still image.