Flexible OLED Display Afterimage Reduction via Partial Area Control
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Solution Overview
Problem
Flexible displays with OLEDs experience image sticking and luminance deviations due to hysteresis variations in thin film transistors, leading to afterimages when the display is folded, bent, or unfolded.
Innovation Solution
An electronic device with a display panel divided into two areas, where a processor controls the display in a partial display state by dividing each frame into sub-periods, deactivating one area and activating the other, and managing the thin film transistors to reduce afterimages and luminance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display is folded, bent, or unfolded, then the display can change size and form factor, but hysteresis variations in thin film transistors cause image sticking and luminance deviation
Solution Approach 1:
The patent applies preliminary action by initializing the thin film transistors before they are activated for normal display operation. The method includes a preliminary initialization period where the TFTs are reset to a known state, preventing hysteresis effects from causing image sticking when the display transitions between folded and unfolded states.
Solution Approach 2:
The patent implements periodic action by dividing the display operation into distinct time periods: an initialization period, a normal display period, and a deinitialization period. This periodic cycling ensures that TFTs are regularly reset to maintain stable operation and prevent cumulative hysteresis effects during flexible display operations.
2Reliability
If the display panel is divided into first and second areas with different activation states, then afterimage can be reduced, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display panel into a first area and a second area that can be independently controlled. The first area undergoes initialization and deinitialization cycles to prevent afterimages, while the second area remains continuously active. This segmentation allows differential treatment of display regions to address afterimage issues without affecting the entire display.
Solution Approach 2:
The patent implements local quality by applying different operational modes to different regions of the display. The first area receives initialization signals and operates in a controlled cycle to maintain image quality, while the second area operates continuously without initialization. This local differentiation optimizes afterimage prevention where needed without unnecessarily complicating the entire display system.
Data Source
AI summary
An electronic device and a method capable of reducing an afterimage of a display are provided. The method includes the operations of where a display panel is divided into a first area and a second area, in response to a specified event, controlling a display panel in a partial display state in which a first area is deactivated and a second area is activated, while the display panel is in the partial display state, dividing each frame into a first sub-period and a second sub-period, and controlling first pixels corresponding to the first area, controlling the first pixels to receive a data voltage corresponding to an inactive state, by supplying the first gate signal to the first pixels in the first sub-period, and controlling the first pixels to receive a bias voltage, by supplying the first gate signal to the first pixels in the second sub-period.