In-Glass Fingerprint Sensor with Transparent Substrate
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Solution Overview
Problem
Existing fingerprint sensors integrated with display modules face challenges in achieving compact size while maintaining satisfactory performance, as they often require separate areas for sensing and display, which can lead to increased size and complexity.
Innovation Solution
A biometric sensor device with a touch-mode fingerprint sensor integrated under a self-light emitting display, utilizing a transparent substrate and conductive protective layer, allowing for simultaneous fingerprint sensing and image display without additional space, and optionally incorporating a pulse oximeter for dual functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate fingerprint sensor and display module are integrated, then both fingerprint sensing and display functionality are achieved, but the device size and structural complexity increase
Solution Approach 1:
The patent merges the fingerprint sensor and display module into a single integrated structure where the fingerprint sensor is positioned directly behind the display screen. The display module serves dual purposes: displaying information and acting as the front surface of the fingerprint sensor, eliminating the need for separate components and reducing overall device complexity.
Solution Approach 2:
The display module is designed to perform multiple functions simultaneously: it serves as both the display interface for showing information and as the front protective layer and sensing surface for the fingerprint sensor. This multi-functionality allows the same component to fulfill both display and biometric authentication roles.
2Adaptability or versatility
If existing fingerprint sensors are integrated with display modules, then both functions are combined, but satisfactory performance and compact size are not achieved
Solution Approach 1:
The fingerprint sensor is nested within the display module structure, with the sensor active area positioned directly behind the display screen. This nesting arrangement allows the fingerprint sensing function to be embedded within the existing display footprint, maximizing space utilization and minimizing overall device volume.
Solution Approach 2:
The patent transitions from a lateral arrangement where fingerprint sensor and display would occupy separate horizontal spaces to a vertical stacking arrangement where the fingerprint sensor is positioned in the depth dimension directly behind the display. This dimensional change allows both functions to coexist within the same projected area, significantly reducing device footprint.
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 compact and efficient user authentication with minimized device size, allowing for both fingerprint recognition and display functionality within a single unit, while also potentially measuring blood oxygen levels when integrated with a pulse oximeter.
Implementation Method 1
a self-light emitting display, utilizing a transparent substrate and conductive protective layer, allowing for simultaneous fingerprint sensing and image display
Implementation Method 2
utilizing a transparent substrate and conductive protective layer, allowing for simultaneous fingerprint sensing and image display without additional space
Data Source
AI summary
A device includes a touch-mode biometric sensor having a first side facing toward a user and a second side opposite to the first side, and a display arranged under the touch-mode biometric sensor and adjacent to the second side and configured to display an image in response to a sensing result, associated with a biometric feature of the user, of the touch-mode biometric sensor.