Dual-Electrode Stylus Circuit for Low-Power Signal Switching
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Solution Overview
Problem
Active-type styluses that use stored electrical energy to transmit signals from both the tip and tail sides increase electrical energy consumption, particularly when simultaneously transmitting signals for contact on either side, leading to inefficiencies in operation response and energy usage.
Innovation Solution
A stylus with a cylindrical housing featuring a tip and tail electrode, a power circuit, and dual transmission circuits that generate distinct downlink signals, controlled by a circuit to alternate transmission modes based on the grasp state, reducing energy consumption by selectively transmitting signals only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the stylus transmits downlink signals from both tip and tail sides simultaneously to handle contact on either side, then the operation response is improved, but the consumption of electrical energy increases
Solution Approach 1:
The patent implements dynamic transmission mode switching based on the hover state and grasp state detection. The control circuit dynamically adjusts which transmission circuit operates (first, second, or both simultaneously) according to real-time conditions, optimizing energy consumption while maintaining responsive operation when needed
Solution Approach 2:
The control circuit periodically determines the hover state and grasp state to switch between different transmission modes. This periodic assessment allows the system to alternate between energy-saving single-circuit transmission and responsive dual-circuit transmission based on operational requirements
2Loss of time
If the stylus transmits downlink signals in hover state to reduce time lag, then the operation response is improved, but the consumption of electrical energy increases
Solution Approach 1:
The patent applies partial action by transmitting downlink signals from only one transmission circuit (either first or second) during hover state, rather than both simultaneously. This reduces energy consumption while still providing timely position detection feedback to the electronic device
Solution Approach 2:
The control circuit self-adjusts the transmission strategy based on detected states. When hover state is determined, it automatically switches to energy-efficient single-circuit transmission, managing its own energy consumption without external intervention
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 solution reduces electrical energy consumption while maintaining operation response by selectively transmitting signals from the tip or tail side, or both, depending on the grasp state, thereby optimizing energy usage in hover and contact states.
Implementation Method 1
a first transmission circuit which, in operation, receives power from the power circuit and generates a first downlink signal that is transmitted toward an outside of the housing through the tip electrode, a second transmission circuit which, in operation, receives power from the power circuit and generates a second downlink signal that is transmitted toward the outside of the housing through the tail electrode
Data Source
AI summary
A stylus includes a first transmission circuit, a second transmission circuit, and a control circuit which controls the first and second transmission circuits according to a first transmission mode in which the control circuit controls the first transmission circuit to transmit a first downlink signal from a tip electrode and controls the second transmission circuit to not transmit a second downlink signal from a tail electrode, a second transmission mode in which the control circuit controls the first transmission circuit to not transmit the first downlink signal from the tip electrode and controls the second transmission circuit to transmit the second downlink signal from the tail electrode, and a third transmission mode in which the control circuit controls the first transmission circuit to transmit the first downlink signal from the tip electrode and controls the second transmission circuit to transmit the second downlink signal from the tail electrode.