Capacitive Stylus Data Transfer Using Proximity-Gated Communication
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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 to transmit pen signals, with a sensor controller reporting the stylus's position to a host processor, allowing data transmission only during a stylus detection period to prevent data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If data is transmitted from a computer to a stylus using an uplink signal, then the stylus does not need to include communication devices (reducing size and weight), but the data transmission speed is low and the stylus may be moved out of the communicable region during transmission (causing data leakage and interception)
Solution Approach 1:
The system performs preliminary detection of the stylus presence and position before initiating data transmission. The sensor controller detects whether the stylus is within the communicable region and reports this to the host processor, which then determines whether to transmit data. This preliminary action prevents data transmission when the stylus is not in the correct position, avoiding data leakage and interception while maintaining the lightweight uplink signal approach.
2Productivity
If data transmission continues when the stylus is moved out of the communicable region, then data can be transmitted without interruption, but the data is not normally received by the stylus and may be intercepted by unrelated communication devices
Solution Approach 1:
The sensor controller continuously monitors the stylus position and provides feedback to the host processor during the transmission process. The host processor uses this feedback information to determine whether to continue or interrupt data transmission. When the stylus moves out of the communicable region, the sensor controller stops reporting, causing the host processor to interrupt transmission, thereby preventing data interception while maintaining transmission continuity when conditions are favorable.
3Speed
If the data transmission speed is increased to reduce transmission time, then data can be transmitted faster, but the likelihood of the stylus being moved out of the communicable region during transmission increases
Solution Approach 1:
The system performs preliminary detection of the stylus presence and position before initiating data transmission. The sensor controller detects whether the stylus is within the communicable region and reports this to the host processor, which then determines whether to transmit data. This preliminary action prevents data transmission when the stylus is not in the correct position, avoiding data leakage and interception while maintaining the lightweight uplink signal approach.
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 is transmitted only when the stylus is within a detectable range, maintaining secure and complete data transfer.
Implementation Method 1
a stylus configured to 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.