Stretchable Display Driving Circuit with Segmented Conductive Lines
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Solution Overview
Problem
Flexible displays are prone to failure due to deformation, which damages conductive components and leads to electrical signal loss, as high-tensile-strength conductive materials have high resistance, especially on a small scale.
Innovation Solution
The display device incorporates a dual-layer conductive structure for data lines, with a brittle and rigid first conductive portion and a ductile second conductive portion, allowing for reduced impedance and deformation without signal failure, using materials like copper, aluminum, and molybdenum, and a package layer to protect light-emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-tensile-strength conductive materials are used, then durability and resistance to deformation are improved, but electrical resistance increases causing signal loss
Solution Approach 1:
The data line is divided into two distinct portions: a first conductive portion made of brittle and rigid material (such as molybdenum) with low resistance, and a second conductive portion made of ductile material (such as copper or aluminum) with high tensile strength. This segmentation allows each portion to fulfill its specific function optimally without compromising the other
Solution Approach 2:
Different portions of the data line are assigned different material properties according to their functional requirements. The first conductive portion uses rigid material for low resistance in stable regions, while the second conductive portion uses ductile material for high tensile strength in deformable regions. This local differentiation resolves the contradiction between resistance and durability
2Adaptability or versatility
If the display is made flexible and deformable, then adaptability is improved, but conductive components are damaged leading to failure
Solution Approach 1:
The data line is segmented into a first conductive portion for stable regions and a second conductive portion for deformable regions. The second portion's ductile material properties enable it to withstand deformation without damage, while the first portion maintains low resistance in stable areas
Solution Approach 2:
The material properties of the data line are changed along its length, with the second conductive portion using ductile materials that can accommodate deformation. This parameter change allows the display to be flexible while maintaining conductive component integrity during deformation
3Reliability
If rigid conductive materials are used, then electrical resistance is reduced, but resistance to deformation is poor
Solution Approach 1:
The data line is divided into a first conductive portion using rigid material for low resistance and a second conductive portion using ductile material for deformation resistance. This segmentation allows the system to achieve both low resistance and deformation resistance through different portions
Solution Approach 2:
Rigid material properties are applied locally in the first conductive portion where low resistance is critical, while ductile material properties are applied locally in the second conductive portion where deformation resistance is critical. This local quality assignment resolves the contradiction between resistance and deformability
Data Source
AI summary
A plurality of package units is on a surface of a substrate, and a driving circuit is on the surface of the substrate. Each package unit includes at least one pixel, and each pixel is provided with a plurality of light-emitting elements. The driving circuit electrically connects to the light-emitting elements and is configured to transmit a plurality of gate driving signals and a plurality of data signals to drive the plurality of light-emitting elements to emit light to display images. The driving circuit is partially in the package units and is partially between adjacent package units. The substrate and a portion of the driving circuit between adjacent package units are made to be stretchable, while the package units are not stretchable.