Touch Screen Vibration Modulation for Stylus Tactile Feedback
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Solution Overview
Problem
Existing touch-sensitive devices lack the tactile feedback simulation of writing on paper when using a stylus, failing to replicate the slip-stick motion and resonance sensations essential for user satisfaction.
Innovation Solution
A method and apparatus that vibrate the touch-sensitive screen to simulate the sensation of writing on paper by modulating the vibration based on stylus velocity, using a combination of pulse rate and amplitude modulation to mimic the friction and resonance of paper, and incorporating sensors and signal generators to adjust the vibration accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stylus is used on a touch-sensitive screen, then writing input can be detected, but the tactile feedback of writing on paper is lost
Solution Approach 1:
The screen is made to vibrate mechanically when contacted by the stylus, simulating the slip-stick motion of pencil on paper. The vibration frequency and amplitude are modulated based on stylus velocity to recreate the tactile sensation of writing on paper fibers.
Solution Approach 2:
The invention creates a virtual copy of the paper writing sensation by analyzing the characteristics of pencil-on-paper friction and reproducing them through controlled screen vibrations, allowing the digital interface to mimic the analog writing experience.
2Ease of operation
If the screen vibrates continuously, then tactile feedback is provided, but energy consumption increases
Solution Approach 1:
Instead of continuous vibration, the screen applies periodic vibrational pulses that correspond to the stylus movement characteristics. The vibration is activated only when stylus contact is detected and deactivated when writing stops, reducing overall energy consumption while maintaining tactile feedback during active use.
Solution Approach 2:
The vibration parameters (frequency, amplitude, duration) are dynamically adjusted based on real-time stylus velocity and pressure data, allowing the system to provide appropriate tactile feedback only when and where needed, optimizing energy usage.
3Ease of operation
If vibration amplitude is increased to simulate paper texture, then writing sensation is improved, but device stability decreases
Solution Approach 1:
The vibration parameters including amplitude, frequency, and duration are dynamically changed based on stylus velocity and pressure measurements. This allows the system to simulate paper texture effectively while maintaining device stability by adjusting parameters within acceptable ranges rather than using fixed high-amplitude vibrations.
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
Enhances user experience by providing a realistic tactile feedback that mimics the sensation of writing on paper, improving appeal and satisfaction when using a stylus on touch-sensitive screens.
Implementation Method 1
arranging the screen to vibrate when contacted by the stylus to provide user feed-back
Implementation Method 2
Paper comprises a fibre mat in a binder with individual fibres having a random orientation resulting in a rough surface having local variations in the coefficient of friction (sliding or static)
Implementation Method 3
a vibration exciter exciting the screen to vibrate so as to transmit the vibration to the stylus
Data Source
AI summary
An apparatus including a touch sensitive screen having a face adapted to receive a user's hand-writing via a hand-held stylus. The screen includes means exciting the screen to vibrate so as to transmit the vibration to the stylus to simulate the sensation of a writing implement writing on paper as the stylus is moved over the face of the screen. The apparatus may include means for period modulating the electrical signal applied to the exciting means and means for amplitude modulating the electrical signal. The apparatus may include means for sensing the velocity of movement of the stylus over the screen face and means for modulating the vibration according to the sensed velocity.