Concurrent Transmitter Set for Multi-Stylus Capacitive Touch Detection
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Solution Overview
Problem
Capacitive touch sensitive screens face challenges in accurately detecting multiple styli and functional buttons, especially in professional graphics or typesetting environments, where precise input and simultaneous detection of multiple styli are required.
Innovation Solution
A set of transmitters that transmit different electrical signals, allowing a touch sensitive device to analyze the statuses and relative positions of multiple styli, including those with varying sensor statuses, by using a combination of frequency synthesizers, signal amplifiers, and sensors, enabling concurrent detection and precise input recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a capacitive touch sensitive screen is used to detect multiple styli concurrently, then the functionality for professional applications is improved, but the measurement precision and reliability of detecting each stylus and its functional buttons deteriorates due to signal interference and cross-talk
Solution Approach 1:
Each stylus is equipped with a unique identifier and functional button status information is segmented and transmitted separately. The touch sensitive screen divides the detection process into identifying the stylus tip location and detecting functional button press status independently, then combines them for comprehensive recognition.
Solution Approach 2:
The system changes detection parameters such as capacitance threshold values and signal filtering settings based on the number and positions of detected styli. When multiple styli are detected, the system dynamically adjusts measurement parameters to maintain precision despite increased complexity.
2Measurement precision
If the touch area made by stylus is reduced for precise input, then the input precision is improved, but the detection of capacitive changes caused by stylus becomes more challenging and less reliable
Solution Approach 1:
The system performs preliminary detection passes to identify the presence and location of styli before conducting the actual precise measurement. This preliminary action allows the system to pre-adjust sensitivity settings and focus detection resources on areas where styli are likely to be detected, improving reliability for small touch areas.
Solution Approach 2:
The system continuously monitors capacitive changes and provides real-time feedback to adjust detection sensitivity. When a stylus with a small touch area is detected, the system increases local sensitivity and applies signal enhancement algorithms to maintain reliable detection despite the reduced capacitive signal.
3Adaptability or versatility
If functional buttons are added to styli for professional applications, then the versatility and functionality are improved, but the device complexity and difficulty of detecting and measuring button status increases
Solution Approach 1:
The functional button detection capability is merged with the existing capacitive touch detection system. Instead of adding a separate detection mechanism, the system combines button press detection with stylus tip location detection by analyzing capacitance changes at different electrode intersections, simplifying the overall device complexity.
Solution Approach 2:
The same capacitive sensing electrodes and detection circuits are used for multiple purposes: identifying stylus tip location, detecting functional button press status, and determining which stylus is being used. This multi-functionality approach avoids adding dedicated detection hardware for each function.
4Productivity
If multiple styli are detected concurrently with their functional button statuses, then the productivity for professional applications is improved, but the difficulty of detecting and measuring increases due to signal interference
Solution Approach 1:
The system adds temporal dimension to the detection process by using time-division multiplexing for stylus identification. Each stylus is assigned different time slots or temporal patterns for signal transmission, allowing the system to distinguish between multiple styli and their button press events by analyzing the timing characteristics of received signals.
Solution Approach 2:
Signal processing algorithms act as intermediaries between the raw capacitive measurements and the final interpretation of stylus positions and button statuses. These intermediary processing steps include noise filtering, signal normalization, and pattern recognition that simplify the interpretation of complex multi-stylus signals.
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 recognition of multiple styli and functional buttons on capacitive touch sensitive screens, enhancing input precision and functionality in professional applications.
Implementation Method 1
a first role transmitter configured to transmit a first electrical signal according to a first role transmitter status to a touch sensitive device
Implementation Method 2
capacitive touch sensitive screens, especially those of projected capacitive types, are very sensitive to finger touches
Data Source
AI summary
The present invention provides a set of transmitters which transmits signals concurrently. The set comprises a first role transmitter configured to transmit a first electrical signal according to a first role transmitter status to a touch sensitive device; and a second role transmitter configured to transmit a second electrical signal according to a second role transmitter status to said touch sensitive device. In consequence, the touch sensitive device is configured to analyze the first and the second electrical signals concurrently transmitted and to get the first and the second role transmitter status as well as a first relative position between the first role transmitter and the touch sensitive device and a second relative position between the second role transmitter and the touch sensitive device.