Touch Pad Click Suppression During Stylus Handwriting
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Solution Overview
Problem
Non-discrete type touch pads unintentionally register click operations when a stylus is used for input due to inconsistent pen pressure, disrupting handwriting and causing discontinuous pressure values.
Innovation Solution
A touch pad with an integrated circuit that detects both finger and stylus inputs, featuring a button function stop unit to prevent unintended click operations and suppress displacement, using force sensors and a button function stop unit to manage input states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the touch pad uses a force sensor to detect press force for button actuation, then the click operation can be realized, but unintended click operations occur when using a stylus for handwriting input
Solution Approach 1:
The patent applies different pressure thresholds for different input objects (finger vs. stylus). The integrated circuit detects the type of input object and adjusts the press force threshold locally - using a lower threshold for finger input to enable click operations, and a higher threshold for stylus input to prevent unintended clicks during handwriting.
2Ease of operation
If the touch screen is displaced downward in a click pad to realize click operation, then the click function is achieved, but the handwriting operation is disturbed when pen pressure changes abruptly
Solution Approach 1:
The patent makes the touch screen displacement dynamic by controlling it only during finger-based click operations. The integrated circuit detects when a finger is pressing and enables touch screen displacement for click feedback, but prevents displacement during stylus handwriting input, thereby maintaining handwriting stability while preserving click functionality.
3Adaptability or versatility
If the touch pad is designed to receive both finger and stylus inputs, then the versatility is improved, but the button actuation threshold cannot be optimized for both input types simultaneously
Solution Approach 1:
The patent dynamically changes the press force threshold parameter based on the detected input object type. The integrated circuit identifies whether a finger or stylus is being used and adjusts the pressure threshold accordingly - setting a lower threshold for finger input to facilitate click operations and a higher threshold for stylus input to prevent unintended activation, thereby optimizing performance for both input types.
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
Prevents unintended click operations and maintains consistent pen pressure during stylus input, enhancing user experience by stabilizing handwriting and pressure detection.
Implementation Method 1
a force sensor detects the press force applied to the touch screen 204, and the output of the force sensor is compared with a threshold to realize the click
Data Source
AI summary
A touch pad is configured to receive input operations using objects including a finger and a stylus. The touch pad includes a touch screen including a touch detection surface that serves as a button and as a position detection region for detecting positions of the objects. The touch pad includes an integrated circuit having an object detection function of detecting the positions of the objects on the touch detection surface and a button function of detecting a press state of the button based on a force applied to the touch detection surface. The touch pad includes a button function stop unit configured to cause, according to an operation state of the stylus or according to a setting related to an input operation of the stylus, the integrated circuit to stop outputting a button press state value indicative of the press state detected by the button function.