Touch Sensing Device Pen Tilt Rotation Detection
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Solution Overview
Problem
Conventional touch sensing devices face challenges in accurately distinguishing between a hand and a pen, particularly in measuring the tilt and rotation of a pen, due to limitations in existing technologies such as capacitive touch screens, which often result in operation errors and difficulties in distinguishing between the two.
Innovation Solution
A touch sensing device with a grid of first and second axis electrodes and a controller that determines the contact position, additional information, tilt, and rotation of a pen by analyzing electrode signals, using distinct frequencies and profiles to differentiate between the pen's signals and distinguish tilt and rotation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a capacitive (C-type) touch screen is used, then the transmittance of light is improved and external light reflection is reduced, but operation errors occur due to unintended contact of hand using a pen
Solution Approach 1:
The touch sensing device segments the sensing function by using multiple independent electrodes (first electrode, second electrode, third electrode) that can independently detect different types of contact. This allows the system to distinguish between hand contact and pen contact by analyzing which electrodes are activated and their signal characteristics, thereby resolving the operation errors while maintaining good light transmittance.
Solution Approach 2:
The invention changes the detection parameters by measuring not only the presence of contact but also the electrical characteristics (capacitance values, signal strengths) of different electrodes. By analyzing these parameter variations, the system can differentiate between hand and pen contacts, improving operation accuracy while maintaining the advantages of capacitive touch screens.
2Adaptability or versatility
If software processing is used to distinguish hand from pen based on contact area, then the distinction capability is improved, but the device complexity increases
Solution Approach 1:
The invention replaces complex software processing with a simpler hardware-based solution using multiple electrodes with different geometries and positions. The hand-pen distinction is achieved through hardware-level signal differentiation rather than complex software algorithms, reducing device complexity while maintaining distinction capability.
Solution Approach 2:
The invention introduces intermediate electrodes (second electrode positioned between first and third electrodes) that act as mediators to detect pen contact. These intermediate electrodes provide additional sensing points that help distinguish pen contact from hand contact without requiring complex software processing, as the physical arrangement of electrodes naturally provides the discrimination capability.
3Adaptability or versatility
If tilt information and rotation information measurement are added, then the user interface diversity is improved, but the device complexity increases
Solution Approach 1:
The existing multi-electrode configuration serves multiple functions: it detects contact position, distinguishes hand from pen contact, and measures tilt and rotation information. By making the electrode system universal and multi-functional, the invention adds tilt and rotation measurement capabilities without requiring separate dedicated sensors, thereby improving user interface diversity while minimizing increases in device complexity.
Solution Approach 2:
The invention merges the tilt and rotation measurement functions with the existing contact detection function by using the same electrode signals for multiple purposes. The capacitance values and signal characteristics from the electrodes are analyzed to extract both contact position information and orientation information (tilt and rotation), combining multiple measurement functions into a single integrated system.
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 accurate measurement of pen tilt and rotation, enhancing user interface diversity and preventing operation errors by effectively distinguishing between hand and pen inputs.
Implementation Method 1
C-type touch screens operate in a way such that they sense a change in a capacitance of a transparent electrode occurring due to the contact of an object
Data Source
AI summary
A touch sensing device determines a contact location of a pen by using a first electrode signal generated from a first electrode of the pen, determines additional information related to the pen by using a second electrode signal generated from a second electrode of the pen, and can determine tilt information of the pen and/or rotation information of the pen by using a profile of the first electrode signal and a profile of the second electrode signal.