In-Display Fingerprint Sensing via Layer Integration
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Solution Overview
Problem
Traditional fingerprint sensors for mobile devices require additional modules that increase cost and thickness, limit fingerprint scanning to predefined areas, and can interfere with acoustic wave phenomenology, especially when using flexible substrates.
Innovation Solution
Integrating a light source and detector on the same layer of the display, allowing the display to function as a fingerprint sensor by illuminating and detecting backscattered light to identify fingerprints anywhere on the screen, eliminating the need for discrete sensors and reducing device thickness and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete fingerprint sensor modules are added to the display stack, then fingerprint scanning capability is improved, but device thickness increases
Solution Approach 1:
The patent merges the fingerprint sensing function with the display structure by integrating light sources and detectors directly into the display layers. This eliminates the need for separate discrete sensor modules, thereby maintaining fingerprint scanning capability while reducing overall device thickness.
Solution Approach 2:
The display structure is designed to serve multiple functions: it acts as both the visual display and the fingerprint sensor. The light sources and detectors are integrated into the display stack, enabling the display to perform both illumination/display and fingerprint detection functions simultaneously.
2Reliability
If discrete fingerprint sensor modules are added to the display stack, then fingerprint scanning capability is improved, but device cost increases
Solution Approach 1:
By combining the fingerprint sensing components with the display structure, the patent eliminates the need for separate sensor modules, thereby reducing component count and assembly complexity. This integration approach lowers manufacturing costs while maintaining fingerprint scanning functionality.
Solution Approach 2:
The display structure performs dual functions as both display and fingerprint sensor, eliminating the need for additional dedicated sensor components. This multi-functionality reduces overall device cost by avoiding redundant hardware and simplifying the bill of materials.
3Reliability
If traditional fingerprint sensors are used, then fingerprint scanning is possible, but scanning is limited to predefined areas
Solution Approach 1:
The patent transitions from point-based or region-based sensing to area-based sensing by distributing light sources and detectors across multiple display layers. This enables fingerprint detection across the entire display surface rather than being confined to predefined zones.
Solution Approach 2:
The display structure serves as both the display and the sensing surface, enabling any area of the display to function as a fingerprint sensor. This universal functionality allows users to place their fingerprints anywhere on the display surface for authentication.
4Adaptability or versatility
If flexible substrates are used in traditional fingerprint sensors, then device flexibility is improved, but acoustic wave phenomenology is interfered with
Solution Approach 1:
The patent replaces acoustic wave-based fingerprint sensing with optical sensing using light sources and detectors. This substitution eliminates the acoustic wave phenomenology that conflicts with flexible substrates, while maintaining the ability to detect fingerprint characteristics through optical means.
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 accurate fingerprint identification across the entire display area without adding thickness or cost, reducing the need for additional hardware and improving user interaction detection efficiency.
Implementation Method 1
illuminating, with a light source, a position of a user interaction on the display
Implementation Method 2
detecting, with a detector, a backscattered light from the position
Data Source
AI summary
Methods and systems for sensing a user interaction (e.g., a fingerprint) with a display of an electronic device are disclosed. In some embodiments, the method includes illuminating, with a light source, a position of a user interaction on the display. In some embodiments, the method includes detecting, with a detector, a backscattered light from the position. In some embodiments, the light source and the detector are located on a same layer of the display.