Piezoelectric Touch Sensor Position-Dependent Vibration Control
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Solution Overview
Problem
Existing touch sensors do not provide reliable tactile feedback, leading to erroneous operations due to unintentional touches and varying pressure detection based on input position, causing discomfort and inefficiency in user interaction.
Innovation Solution
A tactile sensation providing apparatus that includes a load detection unit and a tactile sensation providing unit, controlled by a unit that adjusts the pressure load and standard based on the pushed position to ensure consistent tactile feedback regardless of input position, using piezoelectric elements to provide vibrations corresponding to the detected pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch sensor has a low threshold to receive an input, then the touch sensor is sensitive to user input, but it triggers erroneous operations in response to unintentional motions
Solution Approach 1:
The patent changes the parameter of vibration intensity based on the pressed position. When the pressed position corresponds to a button region, a first vibration intensity is provided, but when it corresponds to a non-button region, a second vibration intensity (lower than the first) is provided. This allows the system to maintain high sensitivity for button inputs while reducing false feedback from unintentional touches in non-button areas.
2Loss of information
If visual feedback is used to confirm input operations, then the operator can confirm the input, but the view of the input object is blocked by the finger
Solution Approach 1:
The patent introduces tactile vibration as an intermediary feedback mechanism. Instead of relying solely on visual feedback that requires the user to see the display, the system provides tactile vibrations through the touch sensor itself. This intermediary tactile channel allows input confirmation without requiring the user to maintain visual contact with the display, thus not blocking the view of input objects.
3Ease of operation
If tactile sensation is provided when the touch sensor receives an input, then feedback is provided to the operator, but the tactile sensation varies depending on the pushed position
Solution Approach 1:
The patent dynamically changes the vibration intensity parameter based on the detected pressed position. By analyzing the position information from the touch sensor, the system determines whether the press corresponds to a button or non-button region and adjusts the vibration intensity accordingly. This ensures consistent and appropriate tactile feedback regardless of the pressed position.
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 apparatus ensures consistent tactile feedback across different input positions, reducing erroneous operations and enhancing user experience by providing a standardized tactile sensation, thus improving operational efficiency and comfort.
Implementation Method 1
a piezoelectric element configured to detect a pressure load when an object presses by a certain pressure a touch face of a touch sensor
Implementation Method 2
using piezoelectric elements to provide vibrations corresponding to the detected pressure
Data Source
AI summary
For providing a tactile sensation regardless of an input position of a user when receiving a pressure at which the tactile sensation is to be provided, The tactile sensation providing apparatus includes: a load detection unit configured to detect a different pressure load depending on a pushed position even when an object presses by a uniform pressure a touch face of a touch sensor to detect a touch input; a tactile sensation providing unit which provides the tactile sensation to the object pressing the touch face of the touch sensor; and a control unit which controls according to the pushed position on the touch face such that the tactile sensation providing unit provides the tactile sensation to the pressing object when the pressing object, applying the uniform pressure, presses any position on the touch face for providing the tactile sensation.