Integrated Piezoelectric Touch Panel for Low-Power Haptic Feedback
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Solution Overview
Problem
Existing touch panels face challenges with large volume, complex modules, high driving voltage, and high power consumption due to the use of linear motors and piezoelectric sheets, which hinder thin design and user experience.
Innovation Solution
A touch panel design comprising a control substrate, touch layer, and piezoelectric layer stacked with a control circuit for electrical connection, allowing for global tactile feedback, simplified module structure, and reduced thickness, weight, and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If linear motors and piezoelectric sheets are used to provide tactile feedback, then tactile feedback function is achieved, but volume, device complexity, driving voltage, and power consumption increase
Solution Approach 1:
The patent combines the piezoelectric layer with the touch panel structure, integrating tactile feedback functionality directly into the panel layers rather than using separate linear motor modules. This merging approach reduces overall volume and simplifies the device structure while maintaining the tactile feedback function.
Solution Approach 2:
The piezoelectric layer serves multiple functions: it provides tactile feedback to users, detects touch pressure through capacitance changes, and can be controlled by the control circuit. This multi-functionality eliminates the need for separate components, reducing volume and complexity.
2Ease of operation
If linear motors and piezoelectric sheets are used to provide tactile feedback, then tactile feedback function is achieved, but device complexity increases
Solution Approach 1:
The patent merges the piezoelectric layer with existing touch panel layers (touch layer, control substrate), creating an integrated structure that reduces module complexity. The control circuit directly controls the piezoelectric layer without requiring separate driver circuits or control modules.
Solution Approach 2:
The piezoelectric layer performs multiple functions including tactile feedback generation, touch pressure detection, and signal transmission to the control circuit, eliminating the need for separate modules and reducing overall device complexity.
3Ease of operation
If linear motors and piezoelectric sheets are used to provide tactile feedback, then tactile feedback function is achieved, but driving voltage and power consumption increase
Solution Approach 1:
The piezoelectric layer is integrated with the touch panel's control circuit, allowing direct control and more efficient energy utilization. This integration reduces power loss and enables lower driving voltages compared to separate linear motor systems.
Solution Approach 2:
The patent utilizes the piezoelectric effect to convert electrical energy to mechanical vibration at low voltages, changing the energy conversion parameter from high-voltage motor operation to low-voltage piezoelectric actuation, thereby reducing power consumption.
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 achieves thinner, lighter, and more energy-efficient touch panels with richer pressure and touch feelings through piezoelectric layer pressure detection and vibration feedback, while minimizing electromagnetic interference.
Implementation Method 1
a piezoelectric layer (201) which are stacked... in a case that a user's finger touches the touchpad, capacitance of the touched position will change, the touch panel will detect the capacitance change
Implementation Method 2
the control circuit is electrically connected with the touch layer and the piezoelectric layer respectively, and is configured to apply electrical signals to the touch layer and the piezoelectric layer
Data Source
AI summary
A touch panel, the touch panel includes a control substrate, a touch layer (202) and a piezoelectric layer (201) that are stacked; the control substrate includes a first substrate (10) and a control circuit layer (11) arranged on the first substrate (10), and the touch layer (202) and the piezoelectric layer (201) are located on the control substrate, the control circuit layer (11) comprises a control circuit (110), and the control circuit (110) is electrically connected with the touch layer (202) and the piezo electric layer (201) respectively, and is configured to apply electrical signals to the touch layer (202) and the piezoelectric layer (201) and/or receive electrical signals from the touch layer (202) and the piezoelectric layer (201) respectively. The touch panel can realize the global tactile feedback function, and has a simple structure and has the advantages of thinner, lighter, lower driving voltage, and lower power consumption.