Flexible Touch Sensing Device with Orthogonal Electrodes
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Solution Overview
Problem
Conventional capacitive touch sensing devices face challenges with glass substrates being non-flexible and having low capacitance sensitivity due to thickness, and PET/ITO substrates forming high resistance ITO electrodes, hindering large area manufacturing and stacked structure fabrication.
Innovation Solution
A touch sensing device is designed with a substrate featuring first and second electrodes arranged orthogonally, covered by insulating and protecting layers, and an adhesive or isolating layer for bonding to a display device, utilizing materials like glass, PET, and transparent conductive oxides to enhance flexibility and capacitance sensitivity without external bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glass substrate is used for touch sensing panel, then low resistance ITO electrode can be formed and large area manufacturing is enabled, but the substrate becomes non-flexible and capacitance sensitivity decreases
Solution Approach 1:
The patent merges the touch sensing electrode layer and the display electrode layer into a single integrated transparent electrode layer formed on the same substrate. This integration eliminates the need for separate bonding processes while maintaining both the flexibility of thin substrates and the manufacturing capabilities of glass-based processes.
Solution Approach 2:
The patent employs composite material structures including transparent conductive oxide layers (such as ITO, IZO, or AZO) combined with insulating layers and protective coatings. This composite approach enables simultaneous achievement of electrical conductivity, flexibility, and manufacturability by selecting materials with complementary properties.
2Reliability
If glass substrate is used for touch sensing panel, then low resistance ITO electrode can be formed, but capacitance sensitivity decreases due to substrate thickness
Solution Approach 1:
The patent utilizes thin film structures for the transparent electrode layers, reducing the overall substrate thickness to improve capacitance sensitivity. The thin film approach maintains electrical conductivity while minimizing the distance between the touch surface and the sensing electrodes, thereby enhancing measurement precision.
Solution Approach 2:
The patent employs composite material structures including transparent conductive oxide layers (such as ITO, IZO, or AZO) combined with insulating layers and protective coatings. This composite approach enables simultaneous achievement of electrical conductivity, flexibility, and manufacturability by selecting materials with complementary properties.
3Adaptability or versatility
If PET/ITO substrate is used for touch sensing panel, then flexibility is achieved, but high resistance ITO electrodes are formed hindering stacked structure fabrication
Solution Approach 1:
The patent merges the touch sensing electrode layer and the display electrode layer into a single integrated transparent electrode layer formed on the same substrate. This integration eliminates the need for separate bonding processes while maintaining both the flexibility of thin substrates and the manufacturing capabilities of glass-based processes.
Solution Approach 2:
The patent employs composite material structures including transparent conductive oxide layers (such as ITO, IZO, or AZO) combined with insulating layers and protective coatings. This composite approach enables simultaneous achievement of electrical conductivity, flexibility, and manufacturability by selecting materials with complementary properties.
4Ease of manufacture
If external bonding assembly process is used to attach touch sensing panel to display panel, then device assembly is achieved, but manufacturing complexity and time increase
Solution Approach 1:
The patent merges the touch sensing electrode layer and the display electrode layer into a single integrated transparent electrode layer formed on the same substrate. This integration eliminates the need for separate bonding processes while maintaining both the flexibility of thin substrates and the manufacturing capabilities of glass-based processes.
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 enables a flexible, high capacitance sensitivity touch sensing device that can be integrated into display devices without external assembly, improving manufacturing efficiency and product stability.
Implementation Method 1
The first electrodes and the second electrodes are configured to sense capacitance variation in respond to a conductor indirectly touching the second electrodes
Data Source
AI summary
A touch sensing device is provided. The device includes a substrate; a plurality of first electrodes formed on the substrate and arranged along a first direction without overlapping one another; a first insulating layer formed on the substrate and covering the plurality of first electrodes; and a plurality of second electrodes formed on the first insulating layer and arranged along a second direction without overlapping one another, wherein the first direction is orthogonal to the second direction.