Stretchable Display Interconnect Layout for Oxidation-Resistant Contacts
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Solution Overview
Problem
Existing display devices face challenges in minimizing damage to extension lines during manufacturing and improving contact resistance between connection patterns and extension lines, particularly in stretchable and flexible substrates.
Innovation Solution
The display device incorporates a stretchable lower substrate with lower and upper pattern layers, including lower and upper planarization layers, and a connection pattern that electrically connects light-emitting elements and extension lines through contact holes in the planarization layers, enhancing electrical connectivity and reducing line resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extension lines are disposed on planarization layers during manufacturing, then electrical connectivity is improved, but the extension lines are damaged or oxidized during the manufacturing process
Solution Approach 1:
The extension line is formed before the upper planarization layer is deposited. This preliminary action allows the extension line to be protected by the subsequent planarization layers, preventing oxidation and damage during manufacturing while maintaining electrical connectivity.
Solution Approach 2:
The upper planarization layer is formed to cover and protect the extension line before any potential damage or oxidation can occur. This protective layer acts as a cushion against harmful factors during the manufacturing process.
2Reliability
If contact holes are formed through planarization layers to improve electrical connection, then contact resistance is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The contact connection is divided into multiple segments: contact holes through the first planarization layer, auxiliary lines, and contact holes through the second planarization layer. This segmentation allows for better electrical connection while distributing the manufacturing complexity across standard photolithography and etching steps.
Solution Approach 2:
An auxiliary line is introduced as an intermediary element between the extension line and the connection pattern. This auxiliary line facilitates electrical connection through the planarization layers using standard manufacturing techniques, reducing overall process complexity.
3Reliability
If multiple planarization layers are used to protect extension lines, then reliability is improved, but device complexity increases
Solution Approach 1:
The upper planarization layer serves multiple functions: it protects the extension line from oxidation and damage, provides a planar surface for subsequent processing, and serves as a dielectric layer for the auxiliary line. This multi-functionality justifies the additional layer by eliminating the need for separate protective layers.
Data Source
AI summary
The present disclosure describes a stretchable display device and a method for manufacturing a stretchable display device. The device includes: a substrate, a pattern layer on the substrate and including plate patterns, and line patterns extending from the plate patterns. The device includes pixel circuits respectively disposed on the plate patterns, light-emitting elements respectively connected to the pixel circuits. The device further includes an extension line, a planarization layer, an auxiliary line disposed on the planarization layer and electrically connected to the extension line through a contact hole, and a connection pattern configured to electrically connect the light-emitting element and the auxiliary line through a contact hole in the planarization layer, and electrically connect the light-emitting element and the extension line through contact holes.