Force Sensor with Directional Electrodes for Horizontal Touch
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Solution Overview
Problem
Existing touch panels cannot sense horizontal forces or movements, limiting their ability to recognize touch intentions and extend human-computer interaction to multi-dimensional domains.
Innovation Solution
A force sensor comprising a first and second substrate with sensing and directional electrodes, allowing relative movement upon horizontal force application, generating signals to determine touch position, direction, and magnitude of force through voltage induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional touch panel structure is used, then touch position can be determined, but horizontal force sensing capability is lost
Solution Approach 1:
The touch panel is divided into multiple independent force sensing units, each equipped with sensing electrodes and directional electrodes. Each unit can independently sense horizontal forces in different directions, allowing the system to achieve comprehensive horizontal force sensing capability while maintaining modular structure that doesn't excessively increase overall complexity.
Solution Approach 2:
The invention transitions from traditional two-dimensional touch position sensing to three-dimensional force sensing by adding horizontal force detection capability. The sensing electrode and directional electrode configuration enables detection of force magnitude and direction in the horizontal plane, extending the sensing dimension from 2D position to 3D force vector.
2Measurement precision
If sensing electrode and directional electrode are positioned close together, then horizontal force sensitivity increases, but signal interference increases
Solution Approach 1:
An insulating layer is introduced as an intermediary between the sensing electrode and directional electrode. This insulating layer physically separates the two electrodes while allowing the sensing mechanism to function, thereby reducing signal interference and crosstalk between adjacent electrodes while maintaining sufficient sensitivity for horizontal force detection.
Solution Approach 2:
The insulating layer is selectively applied in specific regions between electrodes where interference occurs, rather than uniformly across the entire sensor. This localized approach maintains signal strength and sensitivity in critical areas while providing interference isolation where needed, optimizing the balance between sensitivity and signal quality.
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
Enables the recognition of touch intentions by sensing horizontal forces, enriching human-computer interaction and extending touch control technology to multi-dimensional domains without requiring movement of the touch object.
Implementation Method 1
the sensing electrode is configured to generate, under induction of a voltage signal applied to the directional electrode, a sensing signal associated with the relative position
Data Source
AI summary
The disclosure provides a force sensor and a method of manufacturing the same, a touch panel and a touch display panel. The force sensor includes opposite first and second substrates, and a sensing electrode and a directional electrode arranged on the first and second substrates respectively, the first substrate is movable relative to the second substrate when being applied by a touch action with a force tending to incur a horizontal movement, to enable a relative movement between the sensing electrode and the directional electrode corresponding to at least one of a direction and a magnitude of the force and changing a relative position of the sensing electrode relative to the directional electrode, and the sensing electrode is configured to generate a sensing signal associated with the relative position and for determining a touch position and at least one of the direction and the magnitude of the force applied at the touch position.