Flexible Display Circuit Inversion for Stress Distribution
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Solution Overview
Problem
Current display devices lack the ability to deform into various shapes while maintaining structural integrity and flexibility, particularly in the transition between display and non-display areas, leading to potential stress concentration and damage under external forces.
Innovation Solution
A display device design featuring a substrate with defined areas for driving circuits and pixels, where the circuit layer includes conductive patterns and wires with inverted shapes based on virtual straight lines, and a planarization layer to distribute stress evenly, allowing for high elongation and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device uses a conventional rigid structure, then structural integrity is maintained, but the device cannot deform into various shapes
Solution Approach 1:
The patent employs flexible substrate structures and thin-film circuit layers that can bend and deform while maintaining electrical connectivity. The circuit patterns are designed with inverted shapes across the fold line, creating a flexible configuration that allows the display to change shapes without compromising structural integrity.
2Ease of manufacture
If the circuit layer uses conventional symmetric patterns, then manufacturing is simplified, but stress concentration occurs during deformation
Solution Approach 1:
The patent introduces asymmetric circuit patterns where the conductive shapes on either side of the fold line are inverted rather than symmetric. This asymmetric design allows the circuit to accommodate deformation more effectively by distributing stress evenly across the flexure point, preventing stress concentration while maintaining manufacturability through standardized fabrication processes.
3Adaptability or versatility
If the display device allows high elongation, then flexibility is enhanced, but structural integrity may be compromised
Solution Approach 1:
The patent applies inversion symmetry to the circuit patterns across the fold line, where conductive shapes are mirrored and inverted on opposite sides. This inverted configuration allows the structure to elongate and flex more freely while maintaining electrical connectivity and structural integrity, as the inverted geometry naturally accommodates the deformation forces.
Data Source
AI summary
A display device includes a substrate which includes a display area and in which a first opening area is defined, and a non-display area which includes a first driving circuit area and a second driving circuit area adjacent to the first driving circuit area, and in which a second opening area is defined between the first driving circuit area and the second driving circuit area, and a circuit layer disposed on the substrate and including a first driving circuit overlapping the first driving circuit area and including a first conductive pattern and a second driving circuit overlapping the second driving circuit area and including a second conductive pattern. A shape of the first conductive pattern and a shape of the second conductive pattern are inverted from each other based on a first virtual straight line passing through a center of the first driving circuit area and a center of the second driving circuit area in a plan view.