Capacitive Touch Sensor Electrode Geometry for Axis Reduction
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Solution Overview
Problem
Conventional touch sensing devices become complex and costly as the number of sensing axes increases, leading to higher manufacturing costs and circuit complexity.
Innovation Solution
The use of an array of rhombic-shaped first electrodes and triangular-shaped second electrodes, with first electrodes connected to first sensing axes and second electrodes connected to second sensing axes, reduces the number of sensing axes required to accurately determine touch location, simplifying circuits and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of sensing axes is increased to improve touch location accuracy, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The sensing device is divided into multiple sensing units, each containing a first electrode and multiple second electrodes arranged around its peripheral. Each sensing unit independently determines touch location through capacitance changes, allowing the system to achieve high measurement precision without proportionally increasing overall device complexity.
Solution Approach 2:
The patent transitions from conventional rectangular electrode arrangements to a dimensional reconfiguration where first electrodes are surrounded by second electrodes in a radial arrangement. This geometric transformation enables accurate touch location determination with fewer sensing axes by optimizing the capacitance sensing geometry.
2Measurement precision
If the number of sensing axes is increased to improve touch location accuracy, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The sensing device is divided into multiple sensing units, each containing a first electrode and multiple second electrodes arranged around its peripheral. Each sensing unit independently determines touch location through capacitance changes, allowing the system to achieve high measurement precision without proportionally increasing overall device complexity.
Solution Approach 2:
The patent transitions from conventional rectangular electrode arrangements to a dimensional reconfiguration where first electrodes are surrounded by second electrodes in a radial arrangement. This geometric transformation enables accurate touch location determination with fewer sensing axes by optimizing the capacitance sensing geometry.
3Measurement precision
If the number of sensing axes is increased to improve touch location accuracy, then measurement precision is improved, but packaging cost increases
Solution Approach 1:
The sensing device is divided into multiple sensing units, each containing a first electrode and multiple second electrodes arranged around its peripheral. Each sensing unit independently determines touch location through capacitance changes, allowing the system to achieve high measurement precision without proportionally increasing overall device complexity.
Solution Approach 2:
The patent transitions from conventional rectangular electrode arrangements to a dimensional reconfiguration where first electrodes are surrounded by second electrodes in a radial arrangement. This geometric transformation enables accurate touch location determination with fewer sensing axes by optimizing the capacitance sensing geometry.
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
This configuration allows for accurate touch location determination with fewer sensing axes, thereby lowering manufacturing costs and simplifying the touch sensor's circuitry.
Implementation Method 1
at the moment the touch occurs, a capacitance effect is generated; the location of the touch can be determined from the change in capacitance detected by the capacitance sensor
Data Source
AI summary
The present invention relates to a projecting capacitive touch sensing device, display panel, and image display system. The projecting capacitive touch sensing comprises an array of a plurality of sensing units, each sensing unit including: a first electrode made of a sensing material, at least one second electrode made of a sensing material and being disposed around the peripheral of the first electrode, at least one first sensing axis electrically connected to the first electrode, and at least one second sensing axis electrically connected to the second electrodes. The first electrode is quadrangle, while the second electrodes are triangular-shaped. The first electrode and the plurality of second electrodes are arranged to form a rectangular, and a non-sensing area is defined between the first electrode and the second electrodes.