Polarized Display Optical Hole Layout for Fake Fingerprint Detection
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Solution Overview
Problem
Existing display devices face challenges in achieving improved biometric information recognition performance, particularly in distinguishing between genuine and fake biometric inputs, such as fingerprints, due to limitations in optical and capacitive sensing schemes.
Innovation Solution
The display device incorporates a base layer, a circuit layer, an element layer with light emitting and receiving elements, an optical layer with transmission holes, and a polarization layer with a specific transmission axis, where the width perpendicular to the transmission axis is narrower than parallel to it, enhancing the differentiation of biometric input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical and capacitive sensing schemes are used for biometric recognition, then the device structure remains simple, but the ability to distinguish between genuine and fake biometric inputs is insufficient
Solution Approach 1:
The optical layer employs transmission holes with asymmetric dimensions where the width in the first direction is greater than the width in the second direction. This asymmetric geometry creates direction-dependent optical filtering that enhances the ability to distinguish genuine biometric inputs from fake ones, while maintaining a relatively simple overall device structure
Solution Approach 2:
The patent applies local quality by providing different transmission hole dimensions at different locations and orientations within the optical layer. The transmission holes have varying widths in different directions, creating localized optical properties that improve biometric signal differentiation without requiring complete structural redesign of the entire device
2Measurement precision
If the transmission holes in the optical layer have equal width in all directions, then the manufacturing process is simpler, but the signal-to-noise ratio for biometric detection is reduced
Solution Approach 1:
The transmission holes are designed with asymmetric dimensions where the width in the first direction exceeds the width in the second direction. This asymmetry creates directionally selective optical filtering that improves signal-to-noise ratio for biometric detection, while the manufacturing process remains feasible through standard photolithography and etching techniques
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 configuration improves the signal-to-noise ratio and enhances the ability to distinguish between genuine and fake biometric inputs, leading to improved biometric recognition performance.
Implementation Method 1
an element layer on the circuit layer and including a light emitting element and a light receiving element
Implementation Method 2
a polarization layer on the optical layer and having a transmission axis
Data Source
AI summary
A display device includes: a base layer; a circuit layer on the base layer; an element layer on the circuit layer and including a light emitting element and a light receiving element; an optical layer on the element layer and having a first transmission hole corresponding to the light receiving element; and a polarization layer on the optical layer and configured to have a transmission axis, wherein the first transmission hole has a shape in which a width in a direction perpendicular to the transmission axis is smaller than a width in a direction parallel to the transmission axis.