Integrated Pressure Sensors for Adaptive Touchpad Vibration Feedback
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Solution Overview
Problem
Existing pressure-sensitive touchpads lack accurate finger pressure measurement and wide-range vibration feedback, leading to an inconsistent and less satisfying user experience.
Innovation Solution
A pressure measurement and vibration feedback system with integrated sensors, a cushioning layer, and a boost control chip that dynamically adjusts vibration intensity based on pressure, utilizing a modular circuit design for precise pressure detection and efficient feedback generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional touchpads are used without pressure-sensitive sensors, then the device structure remains simple, but the user experience is inconsistent and lacks accurate pressure measurement capability
Solution Approach 1:
The patent combines multiple functions into the integrated sensor module: pressure sensing, vibration feedback actuation, and signal processing are merged into a single component. This allows accurate pressure measurement while reducing overall system complexity by eliminating separate components for each function.
Solution Approach 2:
The integrated sensor serves multiple purposes: it detects finger pressure, generates vibration feedback, and provides tactile response. This multi-functionality enables accurate pressure measurement without requiring additional dedicated components, thus improving measurement capability while maintaining structural simplicity.
2Adaptability or versatility
If vibration feedback intensity is kept constant, then the feedback mechanism is simple, but the user experience lacks dynamic response to varying pressure levels
Solution Approach 1:
The system dynamically adjusts vibration feedback intensity based on real-time pressure sensor readings. The controller modulates the vibration motor output according to the detected pressure level, enabling the feedback mechanism to adapt to varying user interactions while maintaining a relatively simple overall structure.
Solution Approach 2:
The system implements a closed-loop feedback mechanism where pressure sensors continuously monitor finger pressure and the controller adjusts vibration feedback accordingly. This feedback loop enables adaptive response to pressure variations without requiring complex external control systems.
3Ease of operation
If the touchpad surface is made fully flexible for better pressure distribution, then user comfort improves, but the structural integrity and durability decrease
Solution Approach 1:
The touchpad employs different material properties in different regions: the contact surface is made flexible for comfort and pressure distribution, while the underlying structure and border areas maintain higher stiffness for structural integrity. This localized differentiation allows both comfort and durability to coexist.
Solution Approach 2:
The touchpad uses composite construction combining flexible materials for the pressure-sensitive surface with rigid or semi-rigid materials for the support structure. This composite approach enables the flexible surface to provide comfort during interaction while the rigid framework maintains overall structural strength and durability.
4Area of stationary object
If multiple separate sensors are used to cover the entire touchpad area, then pressure detection coverage improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple sensor functions are merged into integrated sensor modules that can cover the entire touchpad area. These modules combine pressure sensing, vibration actuation, and signal processing in single units, reducing the number of discrete components and simplifying the assembly process while maintaining comprehensive coverage.
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 system provides precise finger pressure measurement, wide-range vibration feedback, and a compact design, enhancing user experience with intuitive haptic feedback and improved durability, suitable for various touch-input devices.
Implementation Method 1
the pressure detection and boost control chip performs slow pressure detection via multiple differential voltages of multiple Wheatstone bridge circuits
Implementation Method 2
multiple integrated sensors arranged in a relief notch region of the cushioning layer
Implementation Method 3
the pressure detection and boost control chip switches to fast pressure detection mode. It controls a boost circuit to rapidly raise a drive voltage
Data Source
AI summary
A pressure measurement and vibration feedback system and an operating method for the system are disclosed. The system is arranged with its touch surface facing downward and sequentially includes a cover plate and a PCB board fixed together by a bonding adhesive. A plurality of integrated sensors and a cushioning layer for preventing excessive pressure are provided on the side of the PCB board facing away from the cover plate, the cushioning layer having a relief notch. The integrated sensors are located in the notch area and protrude above the cushioning layer, each sensor having an integrated sensor circuit. The PCB board side facing away from the cover plate is further provided with symmetrically arranged connectors, each connector being electrically connected one-to-one to a corresponding integrated sensor and further connected to a sensing circuit on the PCB board.