Switchable Waveform Electronic Pen for Cross-Tablet Compatibility
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Solution Overview
Problem
Users face inconvenience and economic inefficiency due to the need to switch between different types of electronic pens based on whether a tablet receives sine wave or rectangular wave signals for position detection, as existing pens are designed for specific signal types and require separate configurations.
Innovation Solution
An electronic pen that includes a conductive core, power supply circuit, and signal transmission circuit capable of generating both sine wave and rectangular wave signals, with a control system to selectively supply either signal based on user input, allowing it to be compatible with both types of tablets without the need for multiple pens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If an electronic pen uses a sine wave signal for transmission, then power loss is minimized and battery life is prolonged, but the circuit configuration becomes relatively complicated due to the need for a transformer
Solution Approach 1:
The electronic pen is designed with a switchable signal generation circuit that can output either sine wave signals or rectangular wave signals. This multi-functionality allows the same pen to work with both types of tablets (sine wave type and rectangular wave type), eliminating the need for users to choose between battery life and compatibility.
Solution Approach 2:
The signal transmission circuit incorporates a switching mechanism that dynamically changes the output waveform based on the tablet type. The circuit can switch between sine wave mode (for better battery life) and rectangular wave mode (for simpler configuration), making the system adaptable to different requirements.
2Device complexity
If an electronic pen uses a rectangular wave signal for transmission, then the signal generation circuit is configured simply, but power loss increases and battery life shortens
Solution Approach 1:
The electronic pen integrates both sine wave and rectangular wave signal generation capabilities in a single device. Users can select the appropriate waveform based on their needs: rectangular wave for simplicity or sine wave for extended battery life, while maintaining compatibility with both tablet types.
Solution Approach 2:
The signal transmission circuit allows changing the waveform parameter (from rectangular to sine wave) to optimize performance. By switching the signal type, users can adjust the balance between circuit simplicity and power consumption according to their specific requirements.
3Reliability
If users need to switch between different types of electronic pens based on tablet type, then compatibility with specific tablets is ensured, but user convenience decreases and economic efficiency is reduced
Solution Approach 1:
The electronic pen is designed as a universal device that can interface with both sine wave type tablets and rectangular wave type tablets. A single pen with switchable waveform output replaces the need for multiple dedicated pens, greatly improving user convenience and economic efficiency while maintaining full compatibility with different tablet types.
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
The electronic pen provides a convenient and economical solution by enabling compatibility with both sine wave and rectangular wave tablets using a single device, simplifying configuration and reducing the need for multiple pens.
Implementation Method 1
outputs via the conductive core body a signal coming from the signal transmission part to the tablet by capacitive coupling
Data Source
AI summary
An electronic pen includes a conductive core-side member, a power supply circuit, a signal transmission circuit, an input reception circuit, and a control circuit. The signal transmission circuit receives a power supply voltage from the power supply circuit, generates a first signal and a second signal each having a different waveform, and selectively supplies either the first signal or the second signal to the core-side member. The input reception circuit which receives a designation input designating either the first signal or the second signal to be supplied from the signal transmission circuit to the core-side member. The control circuit controls the signal transmission circuit to supply either the first signal or the second signal to the core-side member according to the designation input received by the input reception circuit.