Capacitive Touch Sensing Circuit with Composite Conductive Layers
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Solution Overview
Problem
Conventional capacitive touch panels have a thick structure due to two sensing layers and high impedance from indium tin oxide conductive elements, limiting sensitivity and signal transmission efficiency.
Innovation Solution
A touch sensing circuit with a single process to form both capacitive sensing layers on a substrate, incorporating a transparent conductive layer, a conductive layer, and an insulating layer, with interconnected electrode units and conductive lines to reduce thickness and impedance, enhancing signal sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two sensing layers are used to achieve capacitive sensing effect, then the sensing capability is improved, but the structure becomes thick
Solution Approach 1:
The patent combines two separate sensing layers into a single integrated structure where a conductive layer is formed on an insulating layer that is disposed on a transparent conductive layer. This merging approach maintains the capacitive sensing capability while reducing the overall structure thickness compared to using two separate sensing layers.
Solution Approach 2:
The patent uses a composite structure consisting of multiple functional layers: transparent conductive layer, insulating layer, and conductive layer. Each layer serves a specific function, and their combination achieves the desired capacitive sensing effect with reduced thickness through optimized material selection and layer configuration.
2Shape
If indium tin oxide conductive elements are used, then the transparent sensing layers can be formed, but the whole resistance becomes high
Solution Approach 1:
The patent employs a composite conductive structure combining transparent conductive layer (made of indium tin oxide or similar transparent conductive material) and conductive layer (made of metal or metal oxide with lower resistance). This composite approach maintains transparency while reducing overall resistance by leveraging the complementary properties of different materials.
Solution Approach 2:
The patent applies different material properties to different parts of the structure: the transparent conductive layer provides transparency and basic conductivity, while the conductive layer provides enhanced electrical conductivity. This local differentiation of material properties allows the structure to simultaneously achieve transparency and low resistance.
3Reliability
If conventional capacitive touch panel structure is used, then the basic sensing function is achieved, but the signal transmission sensitivity is limited
Solution Approach 1:
The patent uses composite material layers with optimized electrical properties to enhance signal transmission sensitivity. The combination of transparent conductive layer and conductive layer creates a structure with improved electrical characteristics that increases sensitivity compared to conventional single-material structures.
Solution Approach 2:
The patent optimizes parameters such as layer thickness, material composition, and electrical conductivity to enhance signal transmission sensitivity. By adjusting these parameters in the multi-layer structure, the sensing sensitivity is improved while maintaining the basic sensing function.
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 results in a thinner, lower-impedance touch sensing circuit with improved signal transmission sensitivity and portability, addressing the limitations of conventional capacitive touch panels.
Implementation Method 1
an insulating layer having a thickness of 1 μm-5 μm disposed between the transparent conductive layer and the conductive layer
Data Source
AI summary
The present invention discloses a touch sensing circuit for capacitive touch panel formed on a substrate comprises a transparent conductive layer having a thickness of 100 Å-500 Å; a conductive layer having a thickness of 1000 Å-5000 Å; and an insulating layer having a thickness of 1 μm-5 μm disposed between the transparent conductive layer and the conductive layer.