Wearable Fingerprint Sensor Integrated Under Display
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Solution Overview
Problem
Conventional fingerprint authentication systems in wearable devices face challenges in providing an intuitive user interface and accurate authentication, especially when the fingerprint sensor is separate from the display and is susceptible to environmental humidity, making it difficult to detect wet fingers and resulting in a non-intuitive user experience.
Innovation Solution
A wearable device with a display unit, a sensor unit that recognizes operating tools, and a control unit that shows guidance displays to guide the operation of the operating tool, integrating fingerprint authentication with the display to ensure accurate recognition and intuitive operation, regardless of humidity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate fingerprint sensor is used away from the display, then the sensor can be protected from humidity, but the user interface becomes non-intuitive and authentication accuracy decreases
Solution Approach 1:
The patent merges the fingerprint sensor and display into a single integrated component, allowing the sensor to be positioned directly beneath the display surface. This enables users to place their fingers directly on the display area for authentication, creating an intuitive interface while maintaining sensor protection through the display layer as a barrier against humidity.
Solution Approach 2:
The display serves as an intermediary layer between the user's finger and the fingerprint sensor. It provides a protective barrier against environmental humidity while allowing optical or capacitive signals to pass through for fingerprint detection, thus protecting the sensor without isolating it from user interaction.
2Ease of operation
If the fingerprint sensor is integrated with the display, then the user interface becomes intuitive, but the sensor becomes susceptible to environmental humidity
Solution Approach 1:
The display acts as a protective intermediary that shields the fingerprint sensor from direct exposure to humidity while allowing the sensor to function. The display material is selected to be impermeable or low-permeability to moisture, creating a barrier that prevents humidity from reaching the sensor components.
Solution Approach 2:
The display utilizes a thin film structure that provides environmental protection to the underlying sensor. This thin film barrier effectively blocks humidity and other environmental factors while maintaining the necessary optical or capacitive properties for fingerprint detection to occur through the display surface.
3Reliability
If a separate fingerprint sensor is used, then sensor protection is improved, but device complexity increases
Solution Approach 1:
The patent combines the fingerprint sensor and display into a single integrated assembly, eliminating the need for separate sensor housings, windows, and mounting structures. This integration reduces the number of components and simplifies the overall device structure while maintaining sensor protection through the display layer itself.
Solution Approach 2:
The display serves multiple functions: it provides the user interface for interaction, protects the fingerprint sensor from environmental damage, and acts as a transmission medium for fingerprint detection. This multi-functionality eliminates the need for dedicated protective structures, thereby reducing device complexity.
Data Source
AI summary
An information processor including a sensor unit that recognizes an operating tool that comes into contact with a display unit, and a control unit that shows a guidance display for guiding an operation of the operating tool on the display unit.