Image Shift Controller for Display Afterimage Reduction
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Solution Overview
Problem
Flat panel displays, such as those used in monitors and televisions, experience display quality degradation due to afterimage effects when showing a single image for a long time or repeatedly displaying still images at long intervals, leading to reduced image clarity and user experience.
Innovation Solution
A display device with an image shift controller that generates shifted image data by modulating original image data to sequentially move the display image along a preset shift path, using a nonvolatile memory to store shift path values and compare frame data to determine when to shift the image, thereby reducing afterimage effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single image is displayed for a long time or still images are repeatedly displayed at long intervals, then the display device can maintain stable operation and low power consumption, but afterimage effects occur leading to degraded display quality
Solution Approach 1:
The patent applies the dynamics principle by making the displayed image movable instead of static. The image shifts sequentially along a preset path on the display panel, changing its position over time. This dynamic movement prevents the persistent stimulation of the same pixel locations that causes afterimage effects, while the system maintains stable operation and low power consumption during prolonged display periods.
Solution Approach 2:
The patent uses an image shift controller as an intermediary component between the image source and the display panel. This controller modifies the image data by applying shift values from a lookup table to sequentially move the image position. The intermediary controller enables the image to change position without requiring physical movement of the display panel or complex hardware modifications, thereby preventing afterimage effects through controlled data manipulation.
2Object-affected harmful factors
If the image is shifted sequentially along a preset path, then afterimage effects are reduced, but the device complexity increases due to the image shift controller and memory components
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple shift values in a lookup table within the memory component before the image display begins. The image shift controller simply retrieves these pre-computed values sequentially without performing complex real-time calculations. This approach reduces the computational burden on the controller during operation, simplifying the device structure while still achieving effective image shifting to prevent afterimage effects.
3Object-affected harmful factors
If the image is shifted continuously, then display quality is maintained during prolonged static image display, but additional power is consumed by the image shift controller and memory operations
Solution Approach 1:
The patent applies periodic action by shifting the image at specific intervals rather than continuously. The image shift controller retrieves shift values from the lookup table at predetermined time intervals, creating a periodic shifting pattern. This approach maintains display quality by periodically disrupting the static image display that causes afterimage effects, while consuming less power than continuous shifting would require.
Data Source
AI summary
A display device including a controller and a display panel. The controller receives original image data and output a display image signal. The display panel receives the display image signal and displays a display image corresponding to the display image signal. The controller includes an image shift controller and a memory. The image shift controller generates shifted image data by modulating the original image data to shift the display image sequentially along a preset shift path on the display panel. The memory stores a shift path value indicating a distance by which the display image has been shifted on the preset shift path. The image shift controller generates the display image signal by processing the shifted image data. When the display device is powered on, the image shift controller generates shifted image data corresponding to a shift path value stored in the memory.