Capacitive Touch Screen Stylus Detection via Multi-Frequency Transmitter
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Solution Overview
Problem
Capacitive touch sensitive screens face challenges in accurately detecting stylus inputs and determining the status of functional buttons, as they are less sensitive to stylus touches compared to finger touches, limiting precise control and button press detection.
Innovation Solution
A method and system that utilize a transmitter with a power supply module, sensor module, frequency synthesizer, and signal amplifying module to transmit electrical signals with multiple frequencies, allowing the touch sensitive device to calculate signal strengths and relative positions, and determine the status of sensors on the transmitter, such as a stylus, by intersecting first and second electrodes and sensing points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive touch sensitive screens are used to detect stylus inputs, then the screen can detect finger touches with high sensitivity, but the detection accuracy of stylus inputs and button statuses deteriorates
Solution Approach 1:
The patent changes the electrical parameters of the stylus by incorporating a transmitter that emits multiple frequencies. The touch-sensitive screen detects these frequency signals to distinguish stylus inputs from finger touches and to identify button press statuses. This parameter change enables the screen to accurately detect stylus inputs and determine the status of functional buttons on the stylus.
Solution Approach 2:
The patent introduces a transmitter as an intermediary component within the stylus. This transmitter emits frequency signals that act as a mediator between the stylus and the touch-sensitive screen, enabling the screen to detect not only the presence of the stylus but also the status of functional buttons through the modulated frequency signals.
2Device complexity
If the screen detects only capacitive changes, then the system remains simple, but the ability to determine button press status deteriorates
Solution Approach 1:
The patent modifies the electrical characteristics of the stylus by incorporating a transmitter that emits multiple frequencies. The touch-sensitive screen detects these frequency signals to distinguish stylus inputs from finger touches and to identify button press statuses. This parameter change enables the screen to accurately detect stylus inputs and determine the status of functional buttons.
Solution Approach 2:
The touch-sensitive screen is enhanced to perform multiple functions: detecting finger touches, detecting stylus inputs, and determining the status of functional buttons on the stylus. This multi-functionality is achieved by detecting frequency signals emitted by the transmitter in the stylus, allowing a single device to handle diverse input scenarios.
3Adaptability or versatility
If a stylus with multiple function buttons is used, then input functionality is enhanced, but the difficulty of detecting and measuring button status deteriorates
Solution Approach 1:
The patent introduces a transmitter as an intermediary component within the stylus. This transmitter emits frequency signals that act as a mediator between the stylus and the touch-sensitive screen, enabling the screen to detect not only the presence of the stylus but also the status of functional buttons through the modulated frequency signals.
Solution Approach 2:
The transmitter in the stylus provides feedback to the touch-sensitive screen by emitting frequency signals that change based on the status of functional buttons. When a button is pressed, the transmitter modulates its frequency signal accordingly, providing real-time feedback to the screen about the button status, which simplifies the detection process.
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 of stylus positions and button statuses on capacitive touch sensitive screens, enhancing input precision and functionality by using mixed frequency signals to modulate transmitter statuses, allowing for multiple function inputs and improved user control.
Implementation Method 1
The transmitter transmits an electrical signal mixed by signals having a plurality of frequencies
Implementation Method 2
capacitive touch sensitive screens
Data Source
AI summary
The present invention provides a method for detecting a transmitter approximating or touching a touch sensitive device. The transmitter transmits an electrical signal mixed by signals having a plurality of frequencies. The touch sensitive device includes a plurality of first electrodes, a plurality of second electrodes and a plurality of sensing points intersected by those first and second electrodes. The method includes: calculating the signal strength of the electrical signal received by each of the first electrodes and second electrodes; and calculating a relative position between the transmitter and the touch sensitive device according to the calculated signal strengths.