Active Pen Dual-Electrode Circuit for Simultaneous Uplink Reception
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Solution Overview
Problem
Existing active pens experience delays in receiving uplink signals due to the time-division manner of transmission and reception, which affects the synchronization of communication methods.
Innovation Solution
The active pen incorporates first and second electrodes for simultaneous transmission and reception using a booster circuit, a reception circuit, and a stop filter to prevent potential interference between the downlink and uplink signals, allowing for concurrent signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transmission and reception are performed in a time-division manner, then device complexity is reduced, but reception delay increases
Solution Approach 1:
The patent merges transmission and reception operations into a simultaneous process by using two separate electrodes (first electrode for transmission, second electrode for reception). This allows the active pen to transmit downlink signals and receive uplink signals at the same time without time-division multiplexing, thereby eliminating reception delays while maintaining manageable device complexity through dedicated hardware paths.
Solution Approach 2:
The patent transitions from temporal dimension (time-division) to spatial dimension by introducing separate physical electrodes for transmission and reception. The first electrode and second electrode are positioned differently in space, allowing simultaneous independent operation without interference, thus resolving the contradiction between simplicity and speed.
2Speed
If simultaneous transmission and reception are performed, then reception speed is improved, but signal interference increases
Solution Approach 1:
The patent segments the communication functions into separate physical components: first electrode for transmission, second electrode for reception, transmission circuit for generating downlink signals, and reception circuit for detecting uplink signals. This segmentation isolates the signal paths, allowing simultaneous operation without mutual interference despite the close proximity of components.
Solution Approach 2:
The patent introduces a stop filter as an intermediary component in the reception circuit to block the downlink signal frequency from reaching the uplink signal detection path. This intermediary element prevents the transmitted signal from interfering with the received signal, enabling simultaneous transmission and reception without harmful interference.
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
This design prevents delays in uplink signal reception and enhances the detection of uplink signals with reduced noise, ensuring timely and accurate communication with the sensor controller.
Implementation Method 1
a transmission circuit that uses a booster circuit to cause a change in the first electrode to thereby transmit a downlink signal
Implementation Method 2
a reception circuit that uses the second electrode to detect an uplink signal
Implementation Method 3
a stop filter that prevents a change in a potential of the first electrode from affecting a potential of the uplink signal detected by the reception circuit
Data Source
AI summary
An active pen includes an integrated circuit that transmits a downlink signal through a first electrode and receives an uplink signal through a second electrode different from the first electrode. The active pen includes a stop filter inserted between the second electrode and the integrated circuit. The integrated circuit, in operation, performs transmission of the downlink signal and the reception of the uplink signal at the same time.