Touch Processing Device for Stylus Detection
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Solution Overview
Problem
Capacitive touch sensitive screens face challenges in accurately detecting stylus inputs and distinguishing between different objects, such as fingers and styli, due to the small contact area and the need for precise detection of buttons in professional graphics and typesetting applications.
Innovation Solution
A touch processing device with a transmitter module that generates and transmits two-dimensional sensing information using multiple frequencies, allowing for the detection and differentiation of various objects on a touch sensitive panel, including styli, fingers, and other objects, by analyzing signal strengths and ratios of frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive touch sensitive screens are used to detect stylus inputs, then the sensitivity to finger touches is improved, but the ability to accurately detect stylus inputs with small contact area deteriorates
Solution Approach 1:
The sensing information is segmented into multiple frequency components. The transmitter detecting module analyzes signals at different frequencies to distinguish between different objects (finger, stylus, palm) based on their unique capacitive characteristics at each frequency, enabling accurate detection of small contact areas while maintaining object differentiation capability
Solution Approach 2:
The system changes the parameter of frequency analysis to differentiate objects. By detecting capacitive changes at multiple frequencies and analyzing the ratio of signal strengths across frequencies, the system can identify whether the touching object is a finger, stylus, or palm, resolving the contradiction between detection sensitivity and object differentiation
2Adaptability or versatility
If multiple sensing methods are employed to distinguish different objects, then the object differentiation capability is improved, but the device complexity increases
Solution Approach 1:
The touch processing device performs multiple functions using a single sensing system. The same capacitive sensing hardware that detects touch position also detects object type by analyzing frequency characteristics, eliminating the need for separate sensing methods and reducing device complexity while maintaining object differentiation capability
Solution Approach 2:
Instead of adding multiple physical sensing methods, the system differentiates objects by changing the analysis parameter to frequency domain characteristics. The transmitter detecting module analyzes the ratio of signal strengths at different frequencies to identify object type, achieving multi-functionality without increasing hardware complexity
3Device complexity
If the touch sensitive screen detects only capacitive changes, then the sensing simplicity is maintained, but the ability to detect buttons on stylus deteriorates
Solution Approach 1:
The system uses electrical signal vibration at multiple frequencies to detect button presses on the stylus. The transmitter detecting module identifies specific frequency patterns and signal strength ratios that correspond to button activation, enabling button detection while maintaining the simplicity of capacitive sensing without requiring additional mechanical or optical sensors
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 detection and processing of multiple objects on a capacitive touch sensitive screen, improving input accuracy and enabling the generation of diverse images for subsequent processing.
Implementation Method 1
capacitive touch sensitive screens...detect the capacitive changes caused by a stylus...generate at least one two-dimensional (2D) sensing information, wherein the at least one 2D sensing information is a sensing information corresponding to a plurality of sensing points with respect to at least one frequency
Data Source
AI summary
The present invention provides a touch processing device which is configured to connect to a touch sensitive panel having a plurality of sensing points. The touch processing device comprises a transmitter detecting module and an information transmitting module. The transmitter detecting module is configured to detect a transmitter transmitting an electrical signal only when approaching or touching the touch sensitive panel and to generate at least a two-dimensional sensing information. The at least one two-dimensional sensing information is sensing information corresponding to the plurality of sensing points with respect to at least one frequency. The information transmitting module is configured to transmit the at least one two-dimensional sensing information.