Active Stylus Signal Switching for Multi-Panel Compatibility
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Solution Overview
Problem
Position detection devices that support only the first or second method are unable to receive transmission signals from styluses configured for the alternate method, necessitating frequent stylus switching when used side by side, leading to inconvenience and increased power consumption.
Innovation Solution
An active stylus that switches between sending pulse train and sine wave signals based on detection device compatibility, reducing unnecessary signal transmission and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stylus sends both pulse train signals and sine wave signals alternately to support multiple detection methods, then compatibility with different position detection devices is improved, but power consumption increases
Solution Approach 1:
The stylus dynamically changes the signal transmission parameter (signal type) based on the detected position detection device type. When a first type device is detected, only pulse train signals are sent; when a second type device is detected, only sine wave signals are sent. This parameter adaptation resolves the contradiction by eliminating unnecessary signal transmissions while maintaining full compatibility with either device type.
2Adaptability or versatility
If the stylus is configured to support multiple signal transmission methods, then versatility is improved, but device complexity increases
Solution Approach 1:
The stylus is designed with multi-functional signal transmission capability, incorporating both pulse train and sine wave generation circuits along with a detection device type identification mechanism. This universal design allows the single stylus to work with multiple types of position detection devices by automatically selecting the appropriate signal transmission method, thereby achieving versatility without requiring multiple specialized styluses.
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
Enables seamless operation with both types of position detection devices without stylus switching, optimizing power usage by adapting signal transmission modes accordingly.
Implementation Method 1
an active stylus that sends information in association with a change in an electric field to a sensor controller via capacitive coupling with a sensor
Data Source
AI summary
An active stylus includes at least one electrode, and an integrated circuit coupled to the at least one electrode. The integrated circuit is configured to: operate in a first mode to unilaterally transmit signals to a sensor controller from one of the at least one electrode; determine whether a pen tip of the active stylus is in contact with a sensor panel; responsive to determining that the pen tip is in contact with the sensor panel, transmit a pen pressure value of the pen tip; and responsive to determining that the pen tip is not in contact with the sensor panel, instead of transmitting the pen pressure value, detect an uplink signal transmitted from the sensor panel.