Optical Fingerprint Recognition Using Microlens Array Segmentation
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Solution Overview
Problem
During optical fingerprint recognition, the accuracy of fingerprint information is compromised due to light scattering when the distance between the finger and the sensor is great, causing the sensor to receive light reflected by multiple ridges and valleys simultaneously.
Innovation Solution
An optical fingerprint recognition apparatus comprising a light emitting structure, a collimating structure, and photosensitive sensors, where the collimating structure filters detecting light reflected by the finger, allowing only light within a predetermined scattering angle to pass through, ensuring that each photosensitive sensor receives light from a specific position on the finger, thereby enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between the finger and the sensor is increased, then the fingerprint recognition area is enlarged, but the accuracy of fingerprint information recognition deteriorates due to light scattering
Solution Approach 1:
The patent divides the light collection path into multiple discrete angular segments using a microlens array. Each microlens focuses light from a specific angular range onto corresponding photosensitive sensors, effectively segmenting the scattered light into distinct spatial channels. This segmentation allows the system to maintain accurate fingerprint recognition across enlarged areas while preventing light from multiple ridges/valleys from mixing and causing misidentification.
Solution Approach 2:
The microlens array acts as an intermediary optical element between the finger and the photosensitive sensors. It mediates the light paths by focusing scattered light from different angular positions onto specific sensor elements, thereby controlling which portions of the finger surface contribute to each sensor's measurement and preventing cross-contamination of light signals.
2Area of stationary object
If the distance between the finger and the sensor is increased, then the field of view is widened, but the sensor receives light from multiple ridges and valleys simultaneously
Solution Approach 1:
The microlens array segments the wide field of view into multiple discrete angular zones. Each lens element handles a specific angular sector, ensuring that light from different ridges and valleys is directed to separate sensor elements. This prevents information loss by maintaining distinct optical paths for different finger surface features, even when the field of view is widened.
Solution Approach 2:
The patent introduces an angular dimension to the light collection process through the microlens array. Instead of collecting light uniformly from all directions (2D plane), the system adds angular selectivity by mapping different scattering angles to spatial positions on the sensor array. This dimensional transformation allows the system to distinguish between light from different ridges and valleys even at increased distances.
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 effectively filters out interfering light, allowing each photosensitive sensor to receive light from a specific position on the finger, thereby improving the accuracy of fingerprint information recognition during the optical fingerprint recognition process.
Implementation Method 1
due to scattering of light reflected by the finger, the sensor may simultaneously receive light reflected by a plurality of ridges and/or valleys
Implementation Method 2
light reflected by a plurality of ridges and/or valleys
Implementation Method 3
the sensing electrode is connected to the anode of the diode and is used for receiving the light transmitted through the collimating structure and converting the light transmitted through the collimating structure into current
Data Source
AI summary
The embodiments of the present disclosure provide an optical fingerprint recognition apparatus and a display panel. The apparatus comprises: a light emitting structure (1), a collimating structure (2) and a plurality of photosensitive sensors (3); the light emitting structure (1) is used for generating detecting light; the collimating structure (2) is used for filtering the detecting light reflected by a finger, such that light with a scattering angle in a predetermined range transmits through the collimating structure (2); the photosensitive sensors (3) are used for receiving the light transmitted through the collimating structure (2) and acquiring fingerprint information according to the received light. The embodiments of the present disclosure are used for manufacturing a display panel. The present disclosure can enhance accuracy of the recognized fingerprint information during an optical fingerprint recognition process.