Transmitter Multi-Frequency Signal Stylus Detection
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Solution Overview
Problem
Capacitive touch sensitive screens face challenges in accurately detecting stylus inputs and button presses, especially in professional graphics or typesetting applications, due to the small contact area and interference from finger touches.
Innovation Solution
A transmitter that emits an electrical signal with multiple frequencies, allowing the touch sensitive device to detect the relative position and status of the stylus, including sensor information, by generating a mixed signal using a frequency synthesizer module and amplifying it for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitive touch sensitive screen is used to detect stylus inputs, then the screen can detect finger touches accurately, but it cannot accurately detect the small contact area of stylus tips and distinguish button presses
Solution Approach 1:
The electrical signal is segmented into multiple frequency components, with each frequency representing a specific sensor status. The frequency synthesizer module generates multiple frequencies corresponding to different button presses and sensor states, allowing the touch screen to detect and distinguish each functional input separately
Solution Approach 2:
The system changes the frequency parameter of the electrical signal to encode different sensor statuses. By modulating the frequency of the transmitted signal based on sensor states, the touch screen can distinguish between different button presses and sensor conditions through frequency analysis
2Adaptability or versatility
If multiple sensors are integrated into the stylus to provide multi-functional input, then the versatility of the stylus is improved, but the complexity of detecting and distinguishing each sensor status increases
Solution Approach 1:
A single electrical signal transmission channel is used to convey information from multiple sensors. The frequency synthesizer module enables one signal to represent multiple sensor statuses simultaneously through frequency modulation, reducing the need for separate detection channels for each sensor
Solution Approach 2:
The frequency synthesizer module acts as an intermediary that translates multiple sensor statuses into a unified electrical signal with distinct frequency components. This mediator simplifies the detection process by converting complex multi-sensor information into a single analyzable signal
3Device complexity
If a single frequency electrical signal is transmitted, then the transmission is simple, but the touch sensitive device cannot determine the transmitter status and relative position accurately
Solution Approach 1:
The system adds the frequency dimension to the electrical signal to encode additional information. By varying the frequency of the transmitted signal according to transmitter status and position, the system conveys more information without increasing the basic signal transmission structure
Data Source
AI summary
The present invention provides a transmitter which is configured to transmit an electrical signal to a touch sensitive device according to a transmitter status. After analyzing the electrical signal, the touch sensitive device is able to find out the transmitter status and a relative position of the transmitter with respect to the touch sensitive device. The electrical signal is mixed from a plurality of signals having different frequencies.