Wireless Stylus Pairing via Time-Coincident Touch Authentication
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Solution Overview
Problem
Existing methods for pairing wireless devices, such as electronic pens and tablets, are cumbersome and require extra transceivers or user input of security credentials, leading to complexity and inefficiency in the pairing process.
Innovation Solution
A method using a touchscreen on a host device combined with a switch on a stylus device, where the time-coincidence of a touch and release on the host device surface is used as out-of-band communication to authenticate pairing, eliminating the need for extra transceivers and user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pairing methods using propagating signals and security credentials are used, then wireless device pairing can be authenticated, but the process becomes cumbersome and requires extra components
Solution Approach 1:
The patent extracts the authentication function from the complex traditional pairing process by using a dedicated switch on the stylus device that directly interacts with the touchscreen sensor. This separation allows authentication to occur through a simple physical action (pressing the stylus tip) without requiring security credentials or complex signal exchanges, thus maintaining reliability while reducing complexity
Solution Approach 2:
The patent introduces an intermediary mechanism - a physical switch on the stylus device that generates a detectable signal when pressed. This intermediary translates a simple user action into an authentication signal, eliminating the need for complex cryptographic exchanges while ensuring secure pairing through a tangible, intentional user gesture
2Reliability
If out-of-band communication with extra radio transceivers is used, then device pairing authentication can be achieved, but manufacturing complexity and expense increase
Solution Approach 1:
The patent makes the existing touchscreen sensor perform multiple functions: it serves both as the display interface and as the authentication sensor for stylus pairing. The switch on the stylus device also serves dual purposes - it's both a mechanical component and an authentication signal generator. This multi-functionality eliminates the need for separate radio transceivers while maintaining authentication reliability
Solution Approach 2:
The patent enables the existing components (touchscreen sensor and stylus switch) to serve the authentication function themselves without requiring additional dedicated hardware. The system uses its own existing infrastructure for pairing authentication, eliminating the need for extra transceivers and reducing manufacturing complexity
3Reliability
If security credentials such as PIN codes are required for pairing, then authentication security is maintained, but user operation becomes cumbersome
Solution Approach 1:
The patent replaces the mechanical/cognitive process of typing security credentials with a simple mechanical action - pressing the stylus tip against the touchscreen. This physical gesture substitution eliminates the need for users to input PIN codes or hexadecimal characters, making the operation intuitive and effortless while maintaining authentication security through the deliberate nature of the action
Data Source
AI summary
In some embodiments, a wireless pairing method involves a touchscreen on a wireless host device combined with a switch on a wireless stylus device. The wireless pairing method uses the time-coincidence of a touch on the host device screen with the detection of a tip switch press on the stylus device as a mode of out-of-band communication to authenticate a pairing of the devices. In such embodiments, a user presses a tip portion of the stylus device against a pairing spot on the host device surface; the wireless devices then form a bonded pair if the touch and/or release of the tip portion of the stylus device with respect to the host device surface are within a pre-determined time co-incidence window of the detection by the host device of that touch and/or release of the tip portion of the stylus device.