Spring-Shaped Pressure Sensing Electrodes for Thin Touch Panels
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Solution Overview
Problem
Conventional touch panels with integrated pressure and touch sensing electrodes are thick and costly, and the complexity of bridging structures reduces product yield and affects accuracy due to limited space and signal interference.
Innovation Solution
A pressure sensing input equipment design featuring alternately arranged first and second electrode layers with pressure sensing electrodes in a spring shape, connected to a Wheatstone bridge circuit, which allows for accurate pressure detection without overlapping and reduces manufacturing complexity by optimizing electrode spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If pressure sensing electrodes and touch sensing electrodes are formed on a single surface, then the product thickness is reduced, but the manufacturing complexity increases due to complicated bridging structures
Solution Approach 1:
The patent combines pressure sensing electrodes and touch sensing electrodes on the same substrate surface, eliminating the need for separate substrates and bridging structures. This merging approach reduces product thickness while maintaining integrated functionality for both pressure and touch sensing.
Solution Approach 2:
The substrate surface serves multiple functions by accommodating both pressure sensing electrodes and touch sensing electrodes. This multi-functional design allows a single surface to handle diverse sensing requirements without increasing overall device complexity.
2Length of moving object
If pressure sensing electrodes occupy large space on the single surface, then the product thickness is reduced, but the distribution density of touch sensing electrodes decreases affecting accuracy
Solution Approach 1:
The patent segments the electrode arrangement by alternately positioning pressure sensing electrodes and touch sensing electrodes in distinct regions. This segmentation allows both electrode types to coexist on the same surface without excessive space occupation, maintaining adequate distribution density for accurate touch sensing.
Solution Approach 2:
Different regions of the substrate surface are assigned different electrode types with optimized local densities. Pressure sensing electrodes are placed in specific areas while touch sensing electrodes are distributed in other areas with sufficient density to maintain sensing accuracy, creating locally optimized electrode configurations.
3Reliability
If pressure sensing electrodes and touch sensing electrodes are arranged alternately and insulated from each other, then signal interference is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent extracts the insulation requirement as a separate design consideration, implementing insulating structures between alternately arranged pressure and touch sensing electrodes. This extraction approach systematically addresses signal interference prevention while establishing clear manufacturing guidelines for electrode positioning and insulation layer thickness.
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 design results in a thinner, lighter touch panel with improved user experience and accuracy, as the spring-shaped pressure sensing electrodes provide sufficient space and increased deformation ability, enhancing the detection of external pressure and touch positions.
Implementation Method 1
the pressure sensing chip determines the pressure magnitude by detecting resistance variation of the first pressure sensing electrodes after pressured
Implementation Method 2
the spring-shaped first pressure sensing electrodes provide sufficient space and increased deformation ability, enhancing the detection of external pressure
Data Source
AI summary
A pressure sensing input equipment includes a first electrode layer, a second electrode layer, a first substrate, and a pressure sensing chip. The first substrate is disposed between the first electrode layer and the second electrode layer. The first electrode layer includes first pressure sensing electrodes and first axial touch sensing electrodes. The first pressure sensing electrodes and the first axial touch sensing electrodes are alternately arranged and insulated from each other and do not overlap. The first pressure sensing electrodes are applied for detecting pressure magnitude. The first pressure sensing electrodes include a first end part and a second end part. The pressure sensing chip is electrically connected to the pressure sensing electrodes, and the pressure sensing chip determines the pressure magnitude by detecting, the resistance variation of the pressure sensing electrodes after pressured. With such design, the pressure sensing input equipment can achieve better pressure magnitude detection.