Back Gate Voltage Control for Uneven Deterioration in Foldable Displays
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Solution Overview
Problem
Foldable and rollable display apparatuses experience uneven deterioration due to differences in driving time across various display areas, leading to reduced display quality.
Innovation Solution
A display apparatus comprising a display panel, a gate driver, a data driver, a time sensor, and a voltage controller that adjusts back gate voltage based on operation time to compensate for differences in deterioration across display areas, with specific configurations for pixels in different areas to enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a foldable or rollable display apparatus is used to maximize flexible characteristics, then the display can be folded or rolled, but different display areas experience different driving times leading to uneven deterioration
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple display areas and applying different back gate voltages to each area based on its specific operation time. The voltage controller adjusts the back gate voltage individually for each display area according to the sensed operation time, ensuring that areas with different deterioration rates receive appropriate compensation voltages to maintain uniform display quality across the entire panel.
2Ease of operation
If display areas are driven with different driving times, then the display can support foldable/rollable configurations, but the rate of deterioration differs between areas
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the back gate voltage parameter based on the operation time of each display area. The voltage controller senses the operation time of each area and modifies the back gate voltage parameter accordingly, increasing the voltage for areas with longer operation times to compensate for accelerated deterioration, thereby stabilizing the overall display quality across areas with different usage patterns.
3Device complexity
If uniform back gate voltage is applied to all display areas, then the circuit design is simplified, but areas with longer operation time deteriorate faster
Solution Approach 1:
The patent applies segmentation by dividing the display panel into multiple display areas with distinct back gate voltage control. Instead of using a single uniform voltage for the entire panel, the system segments the voltage control into area-specific controls, with each display area receiving an independently adjusted back gate voltage based on its operation time, thereby preventing uniform deterioration while maintaining manageable circuit complexity through modular voltage control.
Data Source
AI summary
A display apparatus includes: a display panel comprising a gate line, a data line and a plurality of display areas; a gate driver configured to output a gate signal to the gate line; a data driver configured to output a data voltage to the data line; a time sensor configured to sense an operation time of the display panel; and a voltage controller configured to adjust a back gate voltage according to the operation time sensed by the time sensor and the display areas.