Multi-Channel Pressure Sensor for Touch Input Devices
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Solution Overview
Problem
Current touch input devices can only detect touch position and not the pressure magnitude of a touch, limiting their functionality in computing systems.
Innovation Solution
A touch input device with a pressure sensor that includes multiple channels, where the distance between the pressure sensor and a reference potential layer changes with touch pressure, outputting a signal with capacitance information to detect pressure magnitude using SNR improvement scaling factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch screen is used to detect touch position, then ease of operation is improved, but the ability to detect pressure magnitude is lost
Solution Approach 1:
The patent combines a touch screen with a pressure sensor assembly to create an integrated input device that simultaneously provides touch position detection and pressure magnitude detection. The touch screen and pressure sensor are merged into a single device structure, allowing both functions to operate together without compromising either ease of operation or pressure detection capability.
Solution Approach 2:
The touch input device is designed to perform multiple functions: it detects both touch position (through the touch screen) and pressure magnitude (through the pressure sensor). This multi-functional design allows the single device to replace what would otherwise require separate input mechanisms, maintaining ease of operation while adding pressure detection capability.
2Measurement precision
If a pressure sensor with multiple channels is used to detect pressure magnitude, then pressure detection accuracy is improved, but device complexity increases
Solution Approach 1:
The pressure sensor is divided into multiple channels, each independently detecting pressure at different locations or aspects. This segmentation allows the system to capture pressure magnitude more accurately by combining information from multiple channels, while each individual channel remains relatively simple in structure.
Solution Approach 2:
The patent transitions from single-channel to multi-channel pressure detection, adding a dimensional aspect to the measurement system. By incorporating multiple detection channels that can be processed independently and combined, the system achieves higher precision without requiring each individual component to be overly complex.
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 high-pressure detection accuracy and enhances the capability of touch input devices to detect pressure magnitude, improving user interaction with computing systems.
Implementation Method 1
The pressure sensor outputs a signal including information on a capacitance which is changed according to the distance
Data Source
AI summary
A touch input device capable of detecting a pressure of a touch on a touch surface may be provided. The touch input device includes: a display module; and a pressure sensor which is disposed at a position where a distance between the pressure sensor and a reference potential layer is changeable according to the touch on the touch surface. The distance is changeable according to a pressure magnitude of the touch. The pressure sensor outputs a signal including information on a capacitance which is changed according to the distance. The pressure sensor includes a plurality of electrodes to form a plurality of channels. The pressure magnitude of the touch is detected on the basis of a change amount of the capacitance detected in each of the channels and an SNR improvement scaling factor assigned to each of the channels.