Stretchable OLED Pixel Bridge Layout for Strain Relief
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Solution Overview
Problem
Stretchable OLED displays face damage to light-emitting devices and wires when the stretchable substrate is stretched due to stress concentration and potential crack formation, leading to performance degradation.
Innovation Solution
The design incorporates a stretchable substrate with pixel forming plates connected by bridges that have cut-out grooves and varying strain distribution, using dummy wires and strategically placing signal wires to distribute strain, and employing sensing thin film transistors to measure strain, thereby preventing damage and maintaining display integrity during stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the substrate is stretched to enable flexibility, then adaptability is improved, but the light-emitting devices and wires may be damaged due to stress concentration
Solution Approach 1:
The pixel forming plates are divided into separate units connected by bridges, allowing the structure to segment and move independently during stretching, reducing stress concentration on individual components
Solution Approach 2:
The bridges act as intermediary elements between pixel forming plates, absorbing and distributing mechanical stress during substrate stretching, thereby protecting the light-emitting devices and wires from damage
2Device complexity
If wires are placed directly on the bridge to connect pixels, then device complexity is reduced, but the wires are more susceptible to damage during stretching
Solution Approach 1:
The wire position is optimized locally on the bridge structure, placing wires in regions with lower stress concentration while maintaining electrical connectivity, thereby improving wire durability without significantly increasing device complexity
3Productivity
If the pixel forming plates are closely spaced to increase display density, then productivity is improved, but stress concentration during stretching increases
Solution Approach 1:
The closely spaced pixel forming plates are segmented and connected by bridges that can independently deform during stretching, allowing high display density while distributing stress across multiple flexible connection points
Data Source
AI summary
A diode display includes a substrate having a first island and a second island spaced apart from each other, a first pixel disposed on the first island, and a second pixel disposed on the second island. The first pixel includes a first base layer, a first transistor on the first base layer, a first light emitting element electrically connected to the first transistor, and a first encapsulation layer covering the first light emitting element. The second pixel includes a second base layer, a second transistor on the second base layer, a second light emitting element connected to the second transistor, and a second encapsulation layer covering the second light emitting element.