Rollable Display Terminal Slits for Stress Distribution
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Solution Overview
Problem
As the resolution of rollable display devices increases, the number of terminals for signal input grows, leading to challenges in connecting multiple flexible cables accurately and cost-effectively, resulting in uneven stress distribution when the device is unwound, which can cause significant damage to terminal portions.
Innovation Solution
A rollable electronic device design featuring a flexible display panel with a frame region and terminal portions, where slits are formed between terminal pairs to distribute stress evenly and prevent excessive loading on individual cables during unwinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple flexible cables are connected to terminal portions to drive high-resolution display, then the number of signals that can be processed increases, but the pulling force applied to one flexible cable causes unexpected stress on other flexible cables leading to terminal portion damage
Solution Approach 1:
The terminal portion is segmented by forming slits that divide it into multiple independent regions. Each slit creates a separation between adjacent terminal portions, allowing them to move independently when flexible cables are pulled during unwinding. This prevents stress transmission from one terminal portion to another, eliminating the risk of damage while maintaining the ability to connect multiple flexible cables for high-resolution display driving.
2Quantity of substance
If substrate size increases to accommodate more terminals, then the number of terminals for signal input increases, but connecting one flexible cable to all terminal portions becomes impractical from accuracy and cost viewpoints
Solution Approach 1:
The terminal portion is divided into multiple separate regions by forming slits, which enables independent connection of multiple flexible cables to different terminal portions. This segmentation approach makes it practical to connect multiple flexible cables from accuracy and cost viewpoints, as each connection can be optimized independently rather than requiring one large cable to span the entire substrate.
3Reliability
If slits are formed between terminal portions, then stress distribution is improved and terminal portion damage is prevented, but the structural integrity of the substrate may be compromised
Solution Approach 1:
Slits are formed only in specific localized regions between terminal portions where stress concentration would occur during unwinding. The slits are strategically positioned to release stress at critical interfaces while leaving the rest of the substrate structure intact. This localized modification provides terminal portion protection without significantly compromising the overall structural integrity of the substrate.
Data Source
AI summary
In a display panel, a first slit is formed between a first terminal portion and a second terminal portion that are two of a plurality of terminal portions, and the first slit separates the first terminal portion and the second terminal portion between the first terminal portion and the second terminal portion.