Display-Integrated Fingerprint Sensing via Scattered Light
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Solution Overview
Problem
Conventional fingerprint authentication systems in electronic devices require a dedicated fingerprint reader separate from the display screen, which increases device size and complexity, and do not allow for real-time biometric identification during user interaction.
Innovation Solution
An electronic display with a fingerprint reading area integrated into the screen, utilizing a photosensing element to detect scattered light from a user's finger, which outputs fingerprint image data to a processor for real-time authentication, enabling continuous validation and user classification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated fingerprint reader is disposed separate from the display screen, then the fingerprint reading function is achieved, but the device size and complexity increase
Solution Approach 1:
The patent integrates the fingerprint reader functionality directly into the display screen by incorporating photosensing elements behind the display cover glass. The display cover glass itself becomes part of the fingerprint sensing structure, allowing the fingerprint reading function to be merged with the existing display components rather than adding a separate dedicated reader
Solution Approach 2:
The display cover glass serves multiple functions: it acts as both the display protective layer and the fingerprint sensing interface. The photosensing elements behind the cover glass detect scattered light from fingers placed on the display surface, enabling the display structure to perform both display and biometric authentication functions
2Reliability
If a dedicated fingerprint reader is disposed separate from the display screen, then the fingerprint reading function is achieved, but the device size increases
Solution Approach 1:
The fingerprint sensing area is merged with the display screen area, allowing both functions to occupy the same physical space. The photosensing elements are positioned behind the display cover glass within the display assembly, eliminating the need for additional space that would be required for a separate fingerprint reader
3Reliability
If conventional fingerprint readers are used separate from the display, then authentication is achieved, but real-time authentication during user interaction is not possible
Solution Approach 1:
The system enables continuous fingerprint authentication by having photosensing elements that constantly monitor the display surface for finger contact. As users naturally interact with the display throughout normal operation, the system continuously captures fingerprint images and performs authentication in real-time without interrupting or pausing the user experience
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
This solution allows for compact, integrated fingerprint reading within the display, enabling continuous and real-time biometric authentication, enhancing security and user experience by allowing authentication during screen interaction.
Implementation Method 1
at least one photosensing element configured to detect received scattered light, the received scattered light resulting from interaction of light with an object in at least partial optical contact with the front surface within the fingerprint reading area
Data Source
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AI summary
This disclosure provides systems, methods and apparatus related to biometric authentication of a user of an electronic device. An electronic display has a display cover glass with a front surface that includes a viewing area, and a fingerprint reading area within the viewing area. At least one photosensing element is configured to detect received scattered light, the received scattered light resulting from interaction of light with an object in at least partial optical contact with the front surface within the fingerprint reading area and to output, to a processor, fingerprint image data.