Stylus Data Transfer via Capacitive Coupling for Leakage Prevention
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Solution Overview
Problem
Existing data communication systems using uplink signals in styluses are prone to data interception due to low data transmission speed and the stylus being moved out of the communicable region during data transfer, leading to incomplete or intercepted data transmission.
Innovation Solution
A data communication system utilizing capacitive coupling between a pen point electrode and a sensor electrode group, where data is transmitted during a stylus detection period, ensuring the stylus is within a predetermined distance from the operation surface, thereby preventing data leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If data is transmitted from computer to stylus using uplink signal, then stylus does not need communication device (reduces size and weight), but data transmission speed is low and stylus may be moved out of communicable region during transmission
Solution Approach 1:
The system performs preliminary detection of stylus position before data transmission begins. The sensor controller detects whether the stylus is within the communicable region (predetermined distance from operation surface) and only initiates data transmission if the stylus is properly positioned, thereby preventing data leakage without requiring complex communication devices in the stylus
Solution Approach 2:
The system continuously monitors the stylus position during transmission and uses feedback to control the transmission process. The sensor controller checks the stylus detection status and adjusts transmission timing accordingly, ensuring data is only transmitted when the stylus is within the communicable region, thus maintaining reliability while keeping the stylus simple
2Productivity
If data transmission continues when stylus is moved out of communicable region, then data transmission can complete, but data is not normally received by stylus and may be intercepted
Solution Approach 1:
The system performs preliminary position verification before initiating data transmission. The sensor controller confirms the stylus is within the communicable region (detected by capacitive coupling signal strength) and only then starts transmission, preventing incomplete or interceptable data from being sent
Solution Approach 2:
The system uses continuous feedback from the sensor controller to monitor stylus position during transmission. When the stylus moves out of the communicable region, the feedback signal changes and the system responds by stopping transmission or waiting for proper positioning, thereby eliminating data interception risks while maintaining transmission efficiency
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
Reduces the likelihood of data interception by ensuring data transmission occurs only when the stylus is within range, maintaining secure and complete data transfer.
Implementation Method 1
transmit a pen signal with an electric field by capacitive coupling between a pen point electrode and a sensor electrode group
Data Source
AI summary
A data communication a system including: a stylus including a pen point electrode; a sensor controller; and a host processor. The stylus of data communication system is configured to transmit a pen signal with an electric field by capacitive coupling between the pen point electrode and a sensor electrode group; report, by the sensor controller, a position of the stylus in an operation surface to the host processor in response to detection of the pen signal by the sensor electrode group; supply, by the host processor, data to the sensor controller; and transmit, by the sensor controller, the data to the stylus in a stylus detection period in which the pen signal that is detected by the sensor electrode group indicates that the stylus is present within a predetermined distance from the operation surface.