Photosensitive Conductive Structure for Touch Sensors
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Solution Overview
Problem
Conventional photosensitive electrically conductive structures in touch sensors experience contact impedance instability due to poor alignment during the screen printing process, leading to signal loss and distortion.
Innovation Solution
A photosensitive electrically conductive structure comprising a substrate, a releasing photosensitizing resin layer with an average molecular weight between 3,000 and 100,000, a nano silver layer, and a photosensitive electrically conductive layer, where the nano silver layer is partially covered by the conductive layer, allowing for simultaneous patterning through an exposure-development process to prevent impedance issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If screen printing process is used to produce peripheral wiring region, then manufacturing simplicity is maintained, but alignment precision deteriorates leading to contact impedance instability
Solution Approach 1:
The patent combines the peripheral wiring layer and the sensing electrode layer into a single integrated photosensitive electrically conductive layer. This merging eliminates the need for separate screen printing processes for each layer, thereby maintaining manufacturing simplicity while achieving precise alignment through a single exposure process. The integrated layer ensures that the peripheral wiring and sensing electrodes are automatically aligned without requiring additional alignment steps.
Solution Approach 2:
The patent replaces the mechanical screen printing process with a photosensitive patterning process. Instead of using screen printing to define both the peripheral wiring and sensing electrodes separately, the invention uses a photosensitive electrically conductive layer that can be patterned through exposure to light. This substitution eliminates alignment issues between layers while maintaining ease of manufacture through a streamlined process.
2Ease of manufacture
If screen printing process is used to produce peripheral wiring region, then manufacturing simplicity is maintained, but contact impedance stability deteriorates
Solution Approach 1:
By merging the peripheral wiring and sensing electrodes into a single photosensitive electrically conductive layer, the invention ensures consistent contact impedance throughout the structure. The integrated layer eliminates misalignment between separate layers that would cause impedance variations, thereby improving reliability while maintaining manufacturing simplicity through a unified patterning process.
Solution Approach 2:
The replacement of screen printing with photosensitive patterning ensures uniform material deposition and precise geometric definition, leading to stable contact impedance. The photosensitive process allows for controlled formation of conductive paths with consistent properties, improving reliability without complicating the manufacturing process.
3Ease of operation
If releasing photosensitizing resin layer with low molecular weight is used, then ease of development is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent specifies a molecular weight range (3,000 to 100,000) for the releasing photosensitizing resin layer, optimizing the balance between developability and mechanical strength. This parameter control ensures that the resin layer is sufficiently lightweight for easy development while maintaining adequate mechanical strength to support the conductive layers during processing and operation.
Solution Approach 2:
The invention uses a composite structure where the releasing photosensitizing resin layer works in conjunction with the photosensitive electrically conductive layer. The resin layer provides ease of development and release functionality, while the conductive layer provides mechanical strength and electrical functionality. This composite approach allows each layer to optimize its specific properties without compromising overall performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively stabilizes touch sensor signals by enhancing the alignment and patterning precision, reducing contact impedance, and enabling efficient mass production with improved optical and mechanical properties.
Implementation Method 1
the releasing photosensitizing resin layer, the nano silver layer and the photosensitive electrically conductive layer are patterned
Implementation Method 2
a nano silver layer disposed on the releasing photosensitizing resin layer
Data Source
AI summary
A photosensitive electrically conductive structure includes: a substrate; a releasing photosensitizing resin layer disposed on the substrate; a nano silver layer disposed on the releasing photosensitizing resin layer; and a photosensitive electrically conductive layer disposed on an edge of the nano silver layer. A visible region is defined in the photosensitive electrically conductive structure where the nano silver layer is not covered by the photosensitive electrically conductive layer and a peripheral wiring region is defined in the photosensitive electrically conductive structure where the nano silver layer is covered by the photosensitive electrically conductive layer. The releasing photosensitizing resin layer has an average molecular weight (Mn) greater than 3,000 but less than 100,000, and the releasing photosensitizing resin layer, the nano silver layer, and the photosensitive electrically conductive layer are patterned. A touch sensor includes at least one layer of the photosensitive electrically conductive structure.