Touch Panel Tactile Feedback Using Localized Vibration Superposition
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Solution Overview
Problem
Human-computer interaction based on touch panels often results in errors such as fault touches and false touches, affecting accuracy and efficiency, especially in scenarios where users cannot focus on the panel, leading to reduced user experience.
Innovation Solution
A touch panel with pressure detectors and actuators connected to a driving circuit that generates tactile feedback by actuating the cover plate based on detected touch locations and pressures, enhancing user awareness of their operations through vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tactile feedback is provided for all touch inputs, then user awareness of operations is improved, but false touches and fault touches cannot be distinguished from intentional inputs
Solution Approach 1:
The system performs preliminary actions by detecting touch pressure thresholds and patterns before providing tactile feedback. The driving circuit analyzes the magnitude and duration of applied pressure to determine whether a touch input is intentional or accidental, and only provides feedback for valid inputs, preventing false feedback from fault touches
Solution Approach 2:
The system implements feedback by providing tactile feedback through actuators only after validating touch inputs through pressure detection. The feedback loop includes pressure detection, validation against threshold criteria, and conditional actuator activation, ensuring that feedback is provided only for intentional user inputs
2Measurement precision
If multiple actuators are used to provide precise tactile feedback at touch locations, then user interaction accuracy is improved, but device complexity increases
Solution Approach 1:
The system segments the touch panel into multiple detection and actuation zones with dedicated pressure detectors and actuators positioned at specific locations. This segmentation allows precise localized feedback while maintaining a modular structure that can be systematically managed
Solution Approach 2:
The driving circuit serves multiple functions: it processes signals from multiple pressure detectors, determines touch locations, calculates appropriate feedback parameters, and controls multiple actuators. This multi-functionality reduces the need for separate dedicated circuits for each component
3Manufacturing precision
If pressure detectors and actuators are arranged in a 1:4 to 2:1 ratio, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The system optimizes the ratio of pressure detectors to actuators within the range of 1:4 to 2:1, adjusting this parameter to balance manufacturing precision requirements with device complexity. This parameter optimization ensures sufficient detection coverage and feedback precision while controlling component quantity
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 tactile feedback system improves user interaction accuracy by providing real-time feedback, allowing users to correct mistakes promptly, thus enhancing the overall user experience.
Implementation Method 1
The at least one actuator comprises a piezoelectric device
Implementation Method 2
each pressure detector comprises a piezoresistive device
Data Source
AI summary
This application discloses a touch panel including a base substrate, at least one pressure detector and at least one actuator arranged on the base substrate, a driving circuit, a cover plate and a touch layer. The at least one pressure detector is electrically connected to the driving circuit, and the driving circuit is electrically connected to the at least one actuator. The touch layer is configured to determine a touch location. The driving circuit is configured to generate an actuation signal to control vibration amplitude and frequency of each actuator based on the touch location and detection signals of the at least one pressure detector, causing vibrations provided by each actuator on the cover plate to be superimposed on each other, and making the vibration be enhanced at the touch location and be reduced elsewhere. This application also relates to a human-computer interaction method based on touch panel.