Under-screen Optical Fingerprint Identification with Multi-angle Light Emission
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Solution Overview
Problem
Existing under-screen optical fingerprint identification technologies collect only two-dimensional planar images, which are inadequate for distinguishing real fingers from counterfeit prostheses, leading to poor anti-counterfeiting effectiveness.
Innovation Solution
An under-screen optical fingerprint identification apparatus with a photodetection array featuring three types of pixels and corresponding filter layers, along with a light-emitting layer that emits detection light of different wavebands from various angles, allowing the construction of three-dimensional stereoscopic images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light-emitting area emits detection light from one angle, then the device structure is simple, but the measurement precision of fingerprint three-dimensional features is insufficient
Solution Approach 1:
The light-emitting area is divided into multiple light-emitting units, each emitting detection light from different angles. This segmentation allows the system to capture three-dimensional fingerprint features by combining multiple angular perspectives, resolving the contradiction between measurement precision and structural simplicity.
Solution Approach 2:
The patent transitions from single-angle to multi-angle light emission by adding spatial dimensionality to the light-emitting structure. This enables three-dimensional fingerprint feature capture while maintaining a planar overall layout, effectively resolving the contradiction between measurement precision and device complexity.
2Measurement precision
If only one type of pixel is used in the photodetection array, then the device structure is simple, but the measurement precision of fingerprint features is insufficient
Solution Approach 1:
The photodetection array is segmented into multiple types of pixels (first-type, second-type, third-type), each equipped with specific filter layers to detect different wavelength components of reflected light. This segmentation enables precise fingerprint feature measurement while maintaining a systematic and organized structure.
Solution Approach 2:
Different types of pixels are assigned different filter layer configurations optimized for specific wavelength detection. This local quality differentiation allows each pixel type to specialize in detecting particular spectral characteristics of fingerprint features, improving overall measurement precision without requiring complete structural redesign.
3Loss of information
If a single filter layer is used, then the device structure is simple, but the loss of information about fingerprint spectral characteristics occurs
Solution Approach 1:
The filter layer system is segmented into multiple filter layers, each with different spectral transmission characteristics. This segmentation allows simultaneous detection of multiple wavelength components of reflected light, preserving comprehensive fingerprint spectral characteristic information while maintaining a modular and manageable structure.
4Reliability
If only two-dimensional fingerprint images are collected, then the device structure is simple, but the anti-counterfeiting effectiveness is poor
Solution Approach 1:
The patent transitions from two-dimensional fingerprint image capture to three-dimensional feature detection by incorporating multi-angle light emission and multi-wavelength detection. This dimensionality enhancement significantly improves anti-counterfeiting effectiveness by capturing depth information and spectral characteristics that are difficult to replicate with counterfeit samples.
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 approach enhances the anti-counterfeiting effect by capturing the three-dimensional features of fingerprints, improving the accuracy of identifying real fingers and distinguishing them from counterfeit models.
Implementation Method 1
the light-emitting layer has an identification area corresponding to the contact area, wherein the identification area comprises a plurality of light-emitting units, each of which comprises a light-transmitting area, and at least three light-emitting areas located around the light-transmitting area, wherein the at least three light-emitting areas correspondingly emit detection light of different wavebands from at least three different angles
Implementation Method 2
the at least three light-emitting areas emit detection light to the object to be identified, and signal light formed by the detection light being reflected by the object to be identified propagates to the photosensitive pixel array
Implementation Method 3
The fingerprint chip performs a photoelectric signal conversion to obtain a fingerprint image including finger valley information and finger ridge information
Implementation Method 4
the photosensitive pixel array comprises at least three types of pixels, and at least three different filter layers are correspondingly provided on surfaces of or above the three types of pixels
Data Source
AI summary
The present disclosure provides an under-screen optical fingerprint identification apparatus and a fingerprint identification method. The under-screen optical fingerprint identification apparatus comprises: a photodetection array which has a photosensitive area on which a photosensitive pixel array is provided, wherein the photosensitive pixel array comprises at least three types of pixels; and a fingerprint contact identification area located above the photodetection array and comprising a light-emitting layer and a cover layer, wherein the cover layer has a contact area, and the light-emitting layer has an identification area corresponding to the contact area, wherein the identification area comprises light-emitting units, each of which comprises a light-transmitting area and at least three light-emitting areas located therearound for emitting detection light of corresponding wavebands, wherein the detection light is reflected by an object to be identified to form signal light which passes through the filter layers and reaches corresponding three types of pixels.