Foldable Display Power Management via Dynamic Region Activation
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Solution Overview
Problem
Foldable displays with large screens face increased power consumption and reduced battery lifetime due to the load of the display panel, and users experience eye fatigue from screen flickering during folding and unfolding.
Innovation Solution
A foldable display system that includes a flexible display panel with a measuring part to track the folding angle and an image processor to adjust the image size and black pattern on the screen, using a display panel driver to activate the entire screen when unfolded and a part of the screen when folded, and a gate driver to manage data voltages for pixels, ensuring efficient power use and minimizing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the screen size of the foldable display is increased to provide a larger viewing area, then the display area is improved, but the power consumption increases and battery lifetime is reduced
Solution Approach 1:
The display panel is divided into multiple independent display regions that can be selectively activated. When the device is folded, only the visible region is activated while other regions remain inactive, reducing power consumption. The gate driver selectively applies scanning signals to specific regions based on the folding state, enabling dynamic power management across different display segments.
2Area of moving object
If the entire screen is activated to display images, then the display area is improved, but the power consumption increases
Solution Approach 1:
Instead of activating the entire display panel, the system activates only the necessary portion of the screen based on the folding angle. The image processor generates display signals that correspond only to the visible region, and the gate driver activates corresponding pixel regions, thereby reducing power consumption while maintaining adequate display coverage for the current device state.
3Use of energy by moving object
If the screen displays black during folding and unfolding, then the power consumption is reduced, but the user experiences flickering and eye fatigue
Solution Approach 1:
The display system dynamically adjusts the activated region and displayed content based on the real-time folding angle detected by the measuring part. During folding and unfolding transitions, the system smoothly varies the display region boundaries and scales images appropriately, preventing abrupt black screen transitions and reducing flickering while maintaining power efficiency.
Solution Approach 2:
The image processor dynamically changes display parameters including the size and position of the activated region, image scaling factors, and black pattern dimensions based on the folding angle. These parameter adjustments ensure smooth transitions during folding/unfolding, eliminating flickering effects while optimizing power consumption for each device state.
4Ease of operation
If the image size and black pattern size are adjusted during folding, then the user experience is improved, but the device complexity increases
Solution Approach 1:
The measuring part continuously monitors the folding angle and provides real-time feedback to the image processor. Based on this feedback, the image processor automatically adjusts the image size, black pattern dimensions, and activated region boundaries. This closed-loop control system maintains optimal display parameters for each folding state without requiring complex manual intervention, balancing user experience with manageable device complexity.
Data Source
AI summary
A foldable display comprises a flexible display panel including a screen which displays an image; a measuring part configured to measure a folding angle of the flexible display panel; and an image processor configured to vary a size of the image displayed on the screen and a size of a black pattern displayed on the screen of the flexible display panel while the folding angle of the flexible display panel is varied.