Dual-Electrode Stylus Circuit for Low-Power Hover Response
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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 face increased 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 controlled by a processor to selectively transmit distinct downlink signals from either side based on grasp state determination, reducing energy consumption by switching transmission modes 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 implements dynamic transmission mode switching based on the hover state and grasp state detection. The control circuit determines whether the user is grasping the tip side or tail side of the stylus and dynamically adjusts which transmission circuit is active. This dynamic adaptation allows the system to maintain fast operation response when needed while reducing energy consumption by deactivating unnecessary transmission circuits during hover states.
Solution Approach 2:
The patent employs periodic transmission of downlink signals during hover states rather than continuous transmission. The control circuit activates transmission circuits in alternating periods based on the determined grasp state, transmitting signals from either the tip electrode or tail electrode periodically. This periodic action maintains operational responsiveness while significantly reducing overall electrical energy consumption compared to simultaneous continuous transmission from both sides.
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 applies partial action by transmitting downlink signals from only one transmission circuit (either tip or tail side) during hover state instead of simultaneously from both circuits. The control circuit determines the grasp state and activates only the necessary transmission circuit, providing sufficient signal transmission to maintain low time lag while avoiding the excessive energy consumption of dual-circuit simultaneous transmission.
3Adaptability or versatility
If the stylus is configured to transmit downlink signals from both tip side and tail side to handle contact on either side, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent implements multi-functionality by enabling the stylus to transmit downlink signals from both tip and tail sides through separate transmission circuits, allowing the device to handle contact on either side universally. The control circuit intelligently selects which transmission circuit to activate based on the determined grasp state, making the system adaptable to different contact scenarios while managing the complexity through intelligent control rather than permanent dual-active configuration.
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 tip or tail side of the stylus, optimizing energy use and response in hover 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
Data Source
AI summary
A stylus includes a cylindrical housing, a tip portion provided on a tip side of the housing and including a tip electrode, a tail portion provided on a tail side of the housing and including a tail electrode, a power circuit provided in the housing, 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, the second downlink signal being different from the first downlink signal, and a control circuit which, in operation, controls the first transmission circuit and the second transmission circuit according to a plurality of transmission modes.