Touch Panel With Elastic Dielectric Layer For Pressing Force Detection
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Solution Overview
Problem
Current touch panels in mobile devices lack perceptual feedback for finger pressing force and do not effectively distinguish between screen fingerprint recognition and other touch inputs, making it difficult to determine when a user initiates fingerprint unlocking.
Innovation Solution
A touch panel design featuring a substrate with driving and sensing electrodes, where an elastic dielectric material is placed between overlapping sensing electrodes, allowing the control circuit to differentiate capacitance changes based on panel bending, enabling pressing recognition by comparing capacitance between electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional capacitive touch panel is used, then the touch panel can detect finger contact, but it cannot distinguish between screen fingerprint recognition and other touch inputs, and cannot provide perceptual feedback for finger pressing force
Solution Approach 1:
The touch panel divides the sensing function into multiple independent sensing electrodes (first sensing electrode and second sensing electrode) that can independently measure different capacitance changes. This segmentation allows the system to distinguish between different types of touch inputs and detect pressing force by comparing capacitance measurements from different electrode pairs.
Solution Approach 2:
The patent adds a new dimension to touch detection by introducing multiple sensing electrodes at different positions and orientations. Instead of relying on a single capacitance measurement, the system now measures capacitance changes across multiple electrode pairs, adding spatial dimensionality to the detection process. This enables differentiation between fingerprint recognition (which causes specific localized capacitance changes) and other touch inputs.
2Measurement precision
If the elastic dielectric material is disposed between the first sensing electrode and the second sensing electrode, then the capacitance changes can indicate pressing actions, but the structure becomes more complex
Solution Approach 1:
The patent uses an elastic dielectric material as a flexible component between the sensing electrodes. This thin film material can deform elastically in response to pressing forces, changing the capacitance between electrodes. The flexible nature of this material allows it to integrate into the existing touch panel structure without requiring rigid mechanical components, thereby limiting the increase in structural complexity.
Solution Approach 2:
The elastic dielectric material serves as an intermediary element that translates mechanical pressing force into electrical capacitance changes. Rather than directly measuring force, the system measures the capacitance change caused by the dielectric material's deformation. This intermediary approach simplifies the measurement process while maintaining pressing recognition accuracy.
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 design effectively recognizes pressing actions by varying capacitance differences due to elastic dielectric material deformation, providing feedback and improving user interaction with touch displays.
Implementation Method 1
the elastic dielectric material deforms accordingly, so that a distance between the at least one driving electrode and the at least one first sensing electrode and a distance between the at least one driving electrode and the at least one second sensing electrode is different
Implementation Method 2
a capacitance between the at least one driving electrode and the at least one first sensing electrode and a capacitance between the at least one driving electrode and the at least one second sensing electrode is different accordingly
Data Source
AI summary
A touch panel, a touch display and a method of manufacturing the touch panel are provided. The touch panel includes a substrate, at least one driving electrode, at least one first sensing electrode, at least one second sensing electrode, and an elastic dielectric material. The at least one first sensing electrode is disposed on the substrate and is electrical insulating from the at least one driving electrode. The at least one second sensing electrode is disposed on the at least one first sensing electrode and overlapped with the at least one first sensing electrode. The elastic dielectric material is disposed between the at least one first sensing electrode and the at least one second sensing electrode.