Dual-Electrode Stylus Control Circuit for Lower Hover Power
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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 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 from either the tip or tail electrode during hover states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the stylus simultaneously transmits two types of downlink signals from both tip and tail sides to handle contact on either side, then the operation response is improved, but the consumption of electrical energy increases
Solution Approach 1:
The patent applies dynamics by making the transmission mode switchable between static states. The control circuit dynamically adjusts the transmission configuration based on real-time detection of contact state and grasp state, transitioning between single-signal and dual-signal transmission modes as needed, thereby optimizing energy consumption while maintaining operational responsiveness.
Solution Approach 2:
The patent changes the transmission parameter (number of simultaneous signals) based on operational conditions. By detecting whether the stylus is in contact with the touch surface and how it is being grasped, the system adjusts the transmission mode parameter between transmitting one or two downlink signals simultaneously, thus balancing response speed and energy consumption.
2Loss of time
If the downlink signal is transmitted even when the stylus is 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 implements periodic action by transmitting downlink signals only during specific periods when needed, rather than continuously. The control circuit periodically evaluates the contact state and grasp state, and activates signal transmission only when the conditions warrant it, thus reducing overall energy consumption while maintaining responsive performance when actually needed.
Solution Approach 2:
The transmission state transitions dynamically between active and inactive based on real-time conditions. The system remains in hover state without transmission until contact or specific grasp patterns are detected, at which point transmission activates temporarily to reduce time lag, then deactivates again, creating a dynamic on-demand transmission strategy.
3Adaptability or versatility
If the stylus transmits downlink signal from both tip electrode and tail electrode, then the versatility is improved, but the device complexity increases
Solution Approach 1:
The patent achieves universality by enabling the stylus to handle multiple contact scenarios (tip contact, tail contact, hover states) through a unified dual-electrode transmission system. The same physical structure with tip and tail electrodes serves multiple functions by selectively activating appropriate transmission modes based on detected contact and grasp states.
Solution Approach 2:
The system manages complexity dynamically by switching between different transmission configurations rather than maintaining all configurations simultaneously active. The control circuit adapts the operational state of the transmission circuits based on real-time conditions, effectively managing the complexity of having dual transmission capabilities without requiring permanent activation of all components.
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 effectively reduces electrical energy consumption while maintaining operation response by selectively transmitting signals from the stylus, optimizing energy use during hover states when both tip and tail electrodes are not in contact with the touch surface.
Implementation Method 1
a stylus which includes an antenna also on a tail side opposite a tip side from which a pen signal is transmitted and which can transmit an eraser signal from the antenna is disclosed
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.