Display Panel Afterimage Mitigation via Frame Signal Comparison
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Solution Overview
Problem
Display devices, such as LCDs and OLEDs, suffer from afterimage formation when displaying the same image for an extended period, leading to deteriorated image quality due to the slow response of liquid crystals.
Innovation Solution
A display device with a matrix-form display panel, an image signal comparator, and a panel driver that compares image signals across successive frames, increasing a count value if a proportion of identical signals exceeds a critical value, and displays a non-image signal, such as black or gray, on specific pixel rows or lines when the count reaches preset instruction values to mitigate afterimage formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same image signal is displayed continuously for a long time, then the display device can maintain stable operation, but afterimage sticking occurs and image quality deteriorates
Solution Approach 1:
The patent applies periodic action by inserting non-image signals (such as black or gray signals) at regular intervals during continuous display of the same image. The control unit detects when an image signal is repeatedly displayed and periodically inserts these non-image signals to refresh the liquid crystal molecules, preventing afterimage sticking while maintaining stable operation of the display device.
2Object-affected harmful factors
If a non-image signal is inserted to reduce afterimage, then afterimage sticking is reduced, but image display continuity is interrupted
Solution Approach 1:
The patent applies partial action by inserting non-image signals only in specific situations - when the control unit detects that the same image signal is displayed repeatedly for a predetermined number of frames. The non-image signal is inserted for only one frame at a time, providing just enough refresh to prevent afterimage sticking without excessively interrupting the continuous image display.
3Object-affected harmful factors
If image signals are compared across multiple frames to detect still images, then afterimage can be prevented, but processing complexity increases
Solution Approach 1:
The patent applies self-service by implementing the image comparison and detection functions within the display device itself. The control unit automatically compares current frame image signals with previous frame signals, detects when still images are being displayed, and autonomously decides when to insert non-image signals, eliminating the need for external processing systems.
Data Source
AI summary
A display device includes a display panel which includes a plurality of pixels in a matrix form, an image signal comparator which compares image signals corresponding to at least two successive frames and increases a count value if a proportion of the image signals that are the same as each other exceeds a preset critical value, and a panel driver which drives the display panel to display a non-image signal on at least a part of the display panel during at least one frame if the count value reaches a preset instruction value.