Display Screen as Light Source for Optical Fingerprint Sensor
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Solution Overview
Problem
Existing optical fingerprint imaging systems are limited to capturing fingerprint images only, lacking versatility in application and functionality.
Innovation Solution
An information detection and display apparatus is developed, incorporating an optical sensor, a protective layer, and a display screen that serves as a light source, enabling both fingerprint image capture and display capabilities, as well as detecting the touching position of a finger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical fingerprint imaging system uses a separate backlight board and sensor, then fingerprint image capturing is achieved, but the system has limited usage and cannot display information
Solution Approach 1:
The display screen is designed to serve dual functions: as a display device for showing information and as a light source for fingerprint image capturing. This multi-functionality resolves the contradiction by enabling the system to both display information and capture fingerprints without requiring separate dedicated components for each function.
Solution Approach 2:
The patent combines the display screen and light source functions into a single component. The display screen is integrated with the optical sensor assembly, merging what were previously separate functions (display and illumination) into one unified structure, thereby reducing overall system complexity while expanding versatility.
2Adaptability or versatility
If a display screen is added to the optical sensor assembly, then the system can display information, but the structure becomes more complex
Solution Approach 1:
The display screen is designed to serve dual functions: as a display device for showing information and as a light source for fingerprint image capturing. This multi-functionality resolves the contradiction by enabling the system to both display information and capture fingerprints without requiring separate dedicated components for each function.
3Adaptability or versatility
If the display screen serves as a light source, then the system achieves multiple functions, but the image capturing sensitivity may be affected
Solution Approach 1:
The system dynamically switches between display mode and fingerprint capture mode. When fingerprint capture is needed, the display screen transitions to function purely as a light source, optimizing illumination for the sensor. This dynamic operation ensures that the light source characteristics can be optimized for each specific function, maintaining image sensitivity while enabling multiple functions.
Solution Approach 2:
The display screen's operational parameters (such as brightness, color temperature, and emission intensity) can be adjusted depending on the mode of operation. When used as a light source for fingerprint capture, the parameters are optimized to provide consistent, high-quality illumination that maintains sensor sensitivity and image quality.
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
The apparatus enhances functionality by allowing fingerprint image capture and display, providing additional applications such as displaying information or instructions during the capture process, while maintaining effective image representation and sensitivity.
Implementation Method 1
a display screen disposed underneath the optical sensor, wherein the display screen serves as a light source when the optical sensor is used for detecting optical information
Implementation Method 2
At the interface, part of the light 1011 is reflected while the other part passes through. Thereafter, reflected light 1012 penetrates through the protective glass 103 again and reaches the optical fingerprint sensor 102. In the optical fingerprint sensor 102, the reflected light 1012 is converted into electrical signals
Data Source
AI summary
An information detection and display apparatus, and detecting method and displaying method thereof are provided. The information detection and display apparatus includes: an optical sensor; a protective layer disposed on the optical sensor; and a display screen disposed underneath the optical sensor, wherein the display screen serves as a light source when the optical sensor is used for detecting optical information. The information detection and display apparatus can be used for generating optical fingerprint image, detecting finger touching, and displaying information. Thus, the information detection and display apparatus has multiple functions and applications.