Optical Fingerprint Assembly with Liquid Crystal Light Screening
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Solution Overview
Problem
Current cellphone display screens with optical fingerprint identification systems face issues of high cost, poor integration with display components, and limited functionality due to the use of external silicon-based CMOS or CCD sensors, which are not ideal for compact and cost-effective fingerprint identification.
Innovation Solution
A compact optical fingerprint identification assembly is designed, comprising a light source, a light screening component with a liquid crystal adjusting layer and a light filtering layer, and a photosensitive device, which collimates and filters light to enhance fingerprint identification efficiency, reducing the need for external sensors and spacer layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external silicon-based CMOS or CCD sensors are used for fingerprint identification, then the fingerprint identification effect is improved, but the cost increases and integration with display components deteriorates
Solution Approach 1:
The patent combines the fingerprint identification function with the display panel by integrating the light source component, light screening component, and photosensitive device directly into the display structure. This eliminates the need for external CMOS or CCD sensors and achieves seamless integration between display and fingerprint identification functions.
Solution Approach 2:
The display panel is designed to serve multiple functions: display output and fingerprint identification. The light source component can also serve dual purposes by providing light for both display backlighting and fingerprint illumination, reducing the need for separate components.
2Measurement precision
If external silicon-based CMOS or CCD sensors are used for fingerprint identification, then the fingerprint identification effect is improved, but the cost increases
Solution Approach 1:
The patent combines the fingerprint identification function with the display panel by integrating the light source component, light screening component, and photosensitive device directly into the display structure. This eliminates the need for external CMOS or CCD sensors and achieves seamless integration between display and fingerprint identification functions.
Solution Approach 2:
The patent replaces expensive silicon-based CMOS or CCD sensors with a cost-effective alternative using a light source component, light screening component with liquid crystal adjusting layer, and photosensitive device that can be integrated into the display panel using existing manufacturing processes.
3Device complexity
If a compact structure is designed to reduce spacer layers, then the integration is improved, but the light path adjustment becomes more difficult
Solution Approach 1:
The patent introduces a light screening component with a liquid crystal adjusting layer as an intermediary element between the light source and the photosensitive device. This liquid crystal layer acts as a controllable light deflector that can adjust the light path within the compact integrated structure, solving the light path adjustment difficulty while maintaining compact integration.
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 solution provides a low-cost, compact, and effective fingerprint identification system with improved integration and precision, reducing the number of spacer layers and enhancing the fingerprint identification effect, while maintaining a compact structure.
Implementation Method 1
a light deflecting layer, the pair of electrodes includes a first electrode and a second electrode respectively disposed at two sides of the light deflecting layer to provide a light deflection control voltage for the light deflecting layer
Implementation Method 2
a light screening component disposed at a downstream of the light source component in a light path and configured to collimate light emitted from the light source component, reflected by the fingerprint to be identified and entering the light screening component
Implementation Method 3
a fingerprint identification component disposed at a downstream of the light screening component and configured to receive the light collimated by the light screening component, so as to carry out fingerprint identification
Data Source
AI summary
The present disclosure provides an optical fingerprint identification assembly, a display panel and a display apparatus. The optical fingerprint identification assembly comprises: a light source component configured to provide a light source to illuminate a fingerprint to be identified; a light screening component disposed at a downstream of the light source component in a light path and configured to collimate light emitted from the light source component, reflected by the fingerprint to be identified and entering the light screening component; and a fingerprint identification component disposed at a downstream of the light screening component and configured to receive the light collimated by the light screening component, so as to carry out fingerprint identification. The optical fingerprint identification assembly has the advantages of low cost, compact structure and good identification effect.