Flexible Display Driver Circuit Layout for Bend Stress Dispersion
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Solution Overview
Problem
Flexible electronic paper displays are prone to circuit breaking due to bending, and the degree of bending is limited by the driver circuit, lacking in portability and structural simplicity compared to paper media.
Innovation Solution
A display device design with a flexible display panel, supporting portion, signal line driver circuit inside the supporting portion, and scanning line driver circuit on the display panel perpendicular to the supporting portion, using different transistor materials and stress concentration regions to disperse stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible display panel is bent for portability, then the device becomes more portable and flexible, but the driver circuit may break due to bending stress
Solution Approach 1:
The driver circuit is divided into multiple independent driver circuits distributed across different regions of the flexible display panel. This segmentation ensures that if one driver circuit is damaged due to bending, other driver circuits can continue to function, thereby maintaining overall system reliability while enabling flexible bending for portability.
2Device complexity
If the driver circuit is integrated onto the flexible display panel, then the structure is simplified, but the bending stress concentrates and causes circuit breaking
Solution Approach 1:
The integrated driver circuit is segmented into multiple independent driver circuits positioned at different locations on the flexible display panel. This segmentation reduces stress concentration at any single point during bending while maintaining the overall integrated structure, thus simplifying the device structure without compromising circuit reliability.
Solution Approach 2:
Different regions of the flexible display panel are designed with different functional characteristics. Driver circuits are strategically positioned in regions that experience lower bending stress, while other regions are designed to accommodate the bending requirements. This local differentiation allows the structure to be simplified while protecting the driver circuits from breaking during bending.
Data Source
AI summary
The display device includes: a flexible display panel including a display portion in which scanning lines and signal lines cross each other; a supporting portion for supporting an end portion of the flexible display panel; a signal line driver circuit for outputting a signal to the signal line, which is provided for the supporting portion; and a scanning line driver circuit for outputting a signal to the scanning line, which is provided for a flexible surface of the display panel in a direction which is perpendicular or substantially perpendicular to the supporting portion.