Optical Fingerprint Module with Multi-Layer Diaphragms to Reduce Crosstalk
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Solution Overview
Problem
Existing optical fingerprint recognition technologies face challenges in mass production due to the need to reuse film layers as diaphragm layers, leading to issues like large angle crosstalk, diagonal/moiré stripes, and poor reliability, which affect the accuracy of fingerprint identification.
Innovation Solution
A print recognition module with a light restriction layer directly integrated on the print recognition substrate, comprising multiple diaphragm layers and micro-lenses, which are arranged to minimize crosstalk and improve alignment, allowing for mass production without altering the substrate's manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If film layers are reused as diaphragm layers in mass production, then productivity is improved, but measurement precision deteriorates due to large angle crosstalk and moiré stripes
Solution Approach 1:
The diaphragm structure is segmented into multiple independent diaphragm layers (first diaphragm layer, second diaphragm layer, third diaphragm layer) with alternating light-transmitting and light-blocking patterns. This segmentation allows each layer to independently control light angles, reducing crosstalk and moiré effects while maintaining mass production compatibility through standardized layer fabrication
Solution Approach 2:
The solution transitions from a single-plane diaphragm to a multi-layer stacked architecture extending in the vertical dimension. By arranging diaphragm layers at different heights with alternating transmission patterns, the system controls light propagation in three dimensions, effectively filtering problematic angles without compromising fingerprint recognition accuracy
2Device complexity
If light restriction layer is integrated on the substrate, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The light restriction function is merged directly into the substrate structure by integrating the diaphragm layers and micro-lens array onto the fingerprint recognition substrate. This consolidation eliminates separate light restriction components, simplifying the overall device structure while the micro-lens array provides self-alignment features that mitigate precision requirements
Solution Approach 2:
The micro-lens array integrated on the substrate provides self-alignment functionality, where the lenses automatically guide light transmission paths. This self-service mechanism reduces the need for high-precision manual alignment during assembly, as the optical components self-correct for minor positioning variations
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 reduces crosstalk and improves fingerprint recognition accuracy by optimizing light collimation, enhancing the reliability and efficiency of the optical fingerprint recognition process.
Implementation Method 1
a micro-lens layer on a side of the diaphragm layer facing away from the print recognition substrate; the micro-lens layer includes a plurality of micro-lenses arranged at intervals
Implementation Method 2
the emitted light is reflected by the valleys and ridges of the finger, and then enters the photosensitive device included in the display product. Since the reflected light intensities are different at the positions of valleys and ridges, the photosensitive device generates different electrical signals
Data Source
AI summary
Provided in the present disclosure are a pattern recognition module and a display apparatus. The pattern recognition module includes: a pattern recognition substrate, which includes a base substrate, and a plurality of photosensitive devices arranged in an array and located on one side of the base substrate; and a light constraint layer, which is in direct contact with the side of the pattern recognition substrate that is provided with the plurality of photosensitive devices, and includes at least one diaphragm layer, and a micro-lens layer located on the side of the diaphragm layer that is away from the pattern recognition substrate.