Simultaneous Hand and Stylus Detection via Frequency Segmentation
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Solution Overview
Problem
Existing coordinate measuring systems cannot simultaneously detect the position of a user's hand touch and a stylus pen, as they perform these detections alternately, preventing simultaneous measurement.
Innovation Solution
A coordinate measuring apparatus with a channel electrode circuit, driver circuit, receiver, and processor that generates and processes distinct driving signals for hand and stylus pen detection, allowing simultaneous reception and processing of signals to determine both positions based on capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detection of hand touch and stylus pen is performed alternately in related art, then device complexity is reduced, but simultaneous detection capability is lost
Solution Approach 1:
The patent segments the detection process by assigning different frequency bands to different detection functions: first frequency band for hand touch detection and second frequency band for stylus pen detection. This allows simultaneous detection of both inputs without interference, resolving the contradiction between detection accuracy and system complexity by frequency division rather than temporal alternation.
Solution Approach 2:
The patent changes the frequency parameter of driving signals to enable simultaneous detection. By using different frequency bands (first frequency band for hand touch, second frequency band for stylus), the system can process both detection tasks concurrently without requiring complex alternating detection mechanisms, thus maintaining detection accuracy while simplifying the overall system architecture.
2Measurement precision
If separate detection processes are used for hand touch and stylus pen, then measurement precision is maintained, but productivity decreases
Solution Approach 1:
The patent implements periodic action by applying driving signals at different frequencies simultaneously to electrodes. The hand touch detection uses periodic signals at a first frequency band while stylus pen detection uses periodic signals at a second frequency band, allowing both measurements to occur concurrently without compromising precision, thereby improving detection speed and productivity.
Solution Approach 2:
By changing the frequency parameter of the driving signals, the system enables parallel processing of hand touch and stylus pen detection. The first frequency band is dedicated to hand touch position detection while the second frequency band handles stylus pen detection, allowing simultaneous high-precision measurement of both inputs without sequential processing delays.
3Device complexity
If same frequency band is used for both hand touch and stylus pen detection, then device complexity is reduced, but signal interference occurs
Solution Approach 1:
The patent segments the frequency spectrum into distinct bands: first frequency band for hand touch detection and second frequency band for stylus pen detection. This frequency segmentation prevents signal interference between the two detection modes while maintaining relatively simple signal processing architecture, thus resolving the contradiction between device complexity and detection reliability.
Solution Approach 2:
The patent changes the frequency parameter of driving signals to different bands for different detection purposes. By assigning the first frequency band to hand touch detection and the second frequency band to stylus pen detection, the system eliminates signal interference and improves detection reliability without significantly increasing device complexity.
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 high-speed simultaneous measurement of hand and stylus pen positions by distinguishing and processing different frequency bands of signals from the electrodes, improving detection accuracy and efficiency.
Implementation Method 1
a receiver configured to receive first receiving signal for detecting capacitance change from a portion of the plurality of electrodes
Implementation Method 2
simultaneously receive second receiving signal corresponding to a signal transmitted from a coordinate indicating apparatus from another portion of the plurality of electrodes
Data Source
AI summary
A coordinate measuring apparatus and a coordinate measuring system are provided. The coordinate measuring apparatus includes a channel electrode circuit including a plurality of electrodes, a driver configured to generate a driving circuit signal and provide the driving signal to the channel electrode circuit, a receiver configured to receive first receiving signal for detecting capacitance change from a portion of the plurality of electrodes, and simultaneously receive second receiving signal corresponding to a signal transmitted from a coordinate indicating apparatus from another portion of the plurality of electrodes, and a processor configured to determine a position of at least one of a hand and the coordinating indicating apparatus based on the received first receiving signal and second receiving signal.