Flexible Display Substrate Bending Around Driver and FPC Connections
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Solution Overview
Problem
Flexible electronic paper displays face issues with damage to driver circuits and limited bending due to the presence of driver circuits, which affects their convenience and usability.
Innovation Solution
A display device design featuring a flexible element substrate with a bent portion that includes a driver circuit, where the circuit is strategically placed to increase strength and reduce damage, and a supporting portion that holds the substrate, allowing for increased flexibility and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a driver circuit is provided in a flexible electronic paper display, then the display can be driven and controlled, but the circuit may be damaged when the electronic paper is bent
Solution Approach 1:
The patent divides the flexible substrate into distinct regions: a bent portion that can be flexed and a flat portion that remains planar. The driver circuit is specifically located in the flat portion, separating it from the bending area. This segmentation allows the display to maintain flexibility in the bent region while protecting the circuit in the flat region from damage during bending operations.
2Ease of operation
If a driver circuit is provided in a flexible electronic paper display, then the display functionality is enabled, but the bending of the electronic paper is limited by the driver circuit
Solution Approach 1:
The flexible substrate is segmented into a bent portion and a flat portion, with the driver circuit confined to the flat portion. This allows the bent portion to achieve greater bending freedom without being constrained by the circuit structure, while the flat portion maintains the necessary circuit functionality.
Solution Approach 2:
The patent utilizes the spatial dimension by distributing circuit components across different regions of the flexible substrate. The driver circuit is positioned in the flat portion while display elements extend into the bent portion, creating a dimensional separation that resolves the conflict between circuit protection and bending freedom.
3Ease of operation
If the element substrate is bent at the connecting portion between external terminal electrode and external connecting wiring, then flexibility is improved, but the strength of the connecting portion may be reduced
Solution Approach 1:
The connecting portion is segmented into a bent region for flexibility and a flat region for structural strength. The external terminal electrode and external connecting wiring are positioned such that the bending occurs in a designated area while the critical connecting portions remain in flat areas, maintaining their mechanical strength.
Solution Approach 2:
Different regions of the substrate have different mechanical properties optimized for their function: the bent portion is designed for flexibility with appropriate curvature radius, while the connecting portions in flat areas maintain higher structural strength to prevent damage during assembly and operation.
Data Source
AI summary
To provide a display device including a flexible panel that can be handled without seriously damaging a driver circuit or a connecting portion between circuits. The display device includes a bent portion obtained by bending an element substrate. A circuit for driving the display device is provided in the bent portion and a wiring extends from the circuit, whereby the strength of a portion including the circuit for driving the display device is increased and failure of the circuit is reduced. Furthermore, the element substrate is bent in a connecting portion between an external terminal electrode and an external connecting wiring (FPC) so that the element substrate provided with the external terminal electrode fits the external connecting wiring, whereby the strength of the connecting portion is increased.