Pixel Shift Driving Method for Display Device Afterimage Reduction
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Solution Overview
Problem
Display devices often experience afterimages due to hysteresis characteristics of transistors in pixel circuits and degradation of light emitting diodes, especially when displaying static or moving images with fixed elements like logos, leading to temporary or permanent image retention.
Innovation Solution
A display device and driving method that implement a pixel shift technique by shifting image portions connected to different scan and data lines in alternating directions within frame periods, with specific shift amounts and cycles to create the illusion of movement without perceived image distortion, thereby reducing afterimage effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pixel shift technique is implemented to reduce afterimage effects, then image degradation distribution is improved, but image position stability deteriorates
Solution Approach 1:
The patent applies periodic action by alternately shifting image portions in different directions across alternating frame periods. First pixels connected to first data lines are shifted in a first direction in one frame period, then shifted in a opposite second direction in the next frame period. This periodic bidirectional shifting distributes pixel usage evenly over time, reducing afterimage effects while maintaining overall image position stability through the alternating pattern.
Solution Approach 2:
The patent implements dynamics by making the image position adjustable and time-dependent rather than fixed. Different pixels are dynamically shifted in different directions based on their connection to specific data lines and scan lines. The shift direction and amount are dynamically controlled frame by frame, allowing the system to adaptively distribute pixel stress while preventing permanent afterimages.
2Reliability
If the shift amount of image portions is increased to enhance pixel shift effect, then afterimage visibility is reduced, but image distortion perception increases
Solution Approach 1:
The patent applies local quality by differentiating the shift behavior of different image portions based on their spatial location and data line connections. First pixels connected to first data lines are shifted in a first direction, while second pixels connected to second data lines are shifted in a second direction. This localized differential shifting ensures that each region experiences appropriate stress distribution to reduce afterimages without creating noticeable global distortion.
Solution Approach 2:
The patent implements asymmetry by using different shift directions for different pixel groups in alternating frame periods. Rather than uniformly shifting all pixels in the same direction, the patent creates asymmetric shift patterns where adjacent or related pixel groups move in opposite directions. This asymmetric approach distributes mechanical stress more evenly across the display structure, reducing afterimage visibility while maintaining perceptual image stability.
Data Source
AI summary
A display device includes: a plurality of first pixels connected to a first scan line; a plurality of second pixels connected to a second scan line; and a plurality of third pixels connected to a third scan line, wherein, from a position in a first frame period, an image portion displayed by the first pixels, the second pixels, and the third pixels, which are connected to first data lines, is shifted in a first direction, in a second frame period next to the first frame period, wherein an image portion displayed by the first pixels and the second pixels, which are connected to second data lines, is shifted in the first direction, in the second frame period, wherein an image portion displayed by the third pixels connected to the second data lines is shifted in a direction different from the first direction, in the second frame period.