OLED Touch Structure With Organic Pad Layers for Bending and Signal Isolation
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Solution Overview
Problem
Existing OLED display panels with large-sized touch displays face issues with touch performance and bending performance due to interference from voltage signals and poor bending capabilities of inorganic layers in the touch structure, which affect the functionality and flexibility of the display.
Innovation Solution
The touch structure incorporates organic layers and conductive layers stacked with protective pad layers to reduce signal interference and improve bending performance by using organic materials with higher resistivity and better bending properties, and includes a protective pad layer between the conductive and organic layers to prevent corrosion during etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inorganic layers are used in the touch structure, then signal interference is reduced, but bending performance deteriorates
Solution Approach 1:
The patent changes the material parameter from inorganic to organic, specifically using high-resistivity organic materials (such as polyimide or polyethylene terephthalate) for the protective pad layer. This parameter change maintains the electrical isolation function (reducing signal interference) while introducing superior bending flexibility characteristic of organic materials, thus resolving the contradiction between signal interference reduction and bending performance.
Solution Approach 2:
The patent creates a composite structure by combining organic protective pad layer materials with conductive layer materials. The protective pad layer uses organic materials with high resistivity properties, forming a composite touch structure that leverages the electrical isolation properties of organic materials while maintaining the conductive function of the conductive layers, thereby achieving both reduced signal interference and improved bending performance.
2Stability of the object's composition
If inorganic layers are used in the touch structure, then structural stability is improved, but flexibility deteriorates
Solution Approach 1:
The patent changes the material composition parameter from inorganic to organic for the protective pad layer. Organic materials inherently possess greater flexibility while maintaining adequate structural stability through proper material selection and layer design. This parameter change directly addresses the contradiction by improving flexibility without sacrificing necessary structural stability.
3Reliability
If protective pad layer is added between conductive and organic layers, then corrosion prevention is improved, but device complexity increases
Solution Approach 1:
The patent introduces a protective pad layer as an intermediary component between the conductive layer and the organic layer. This intermediary layer serves multiple functions: it prevents corrosion of the conductive layer during etching processes, provides electrical isolation, and maintains structural integrity. While it adds a layer to the structure, the protective pad layer uses standard organic materials and conventional deposition techniques, thereby limiting the increase in device complexity while achieving significant reliability improvements.
Data Source
AI summary
A touch structure includes at least one touch functional layer group and at least one protective pad layer. The at least one touch functional layer group includes an organic layer and a conductive layer that are sequentially stacked. The at least one protective pad layer is arranged in one-to-one correspondence with the at least one touch functional layer group. A protective pad layer is located between a conductive layer and an organic layer of a corresponding touch functional layer group. An orthographic projection of the protective pad layer on the organic layer at least partially overlaps with an orthographic projection of the conductive layer on the organic layer.