Foldable Display Fingerprint Optics With Transmission Holes
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Solution Overview
Problem
Current foldable display devices face challenges in reliably detecting fingerprint authentication information due to limitations in optical layer design and refractive index mismatch, leading to inefficiencies and potential authentication errors.
Innovation Solution
A foldable display device design featuring a window with a defined fingerprint detection region, an optical layer with transmission holes, a protection layer with a higher refractive index than the window, and a sensor positioned below the protection layer, optimizing light pathways to enhance fingerprint detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional optical layer design is used in foldable display devices, then the device structure is simple, but the fingerprint authentication reliability is poor due to refractive index mismatch and unstable light transmission
Solution Approach 1:
The patent introduces an optical layer with transmission holes as an intermediary component between the window and the sensor. This optical layer mediates the light transmission path, allowing light to pass through the transmission holes to reach the sensor while maintaining structural integrity. The optical layer acts as a mediator that resolves the refractive index mismatch issue by providing a controlled optical pathway, thereby improving fingerprint authentication reliability without significantly increasing device complexity.
Solution Approach 2:
The patent applies local quality by creating transmission holes at specific locations in the optical layer that correspond to the fingerprint detection region. Rather than uniformly modifying the entire optical layer, the transmission holes are locally positioned to optimize light transmission only where needed for fingerprint authentication. This localized modification improves authentication reliability while minimizing additional complexity.
2Reliability
If the protection layer has the same refractive index as the window, then the manufacturing process is simple, but light transmission stability is poor leading to authentication errors
Solution Approach 1:
The patent changes the refractive index parameter of the protection layer, making it higher than that of the window material. This parameter change optimizes the optical properties and light transmission stability through the layered structure. By adjusting the refractive index parameter, the patent improves light transmission stability and reduces authentication errors, while the manufacturing process remains feasible with standard materials and techniques.
3Measurement precision
If the sensor is positioned closer to the optical layer, then the device thickness is reduced, but the light reception efficiency decreases leading to detection errors
Solution Approach 1:
The patent addresses the spatial constraint by introducing transmission holes that create a focused light pathway in the vertical dimension. The transmission holes are positioned and sized to guide light efficiently from the window through the optical layer to the sensor, optimizing the light reception efficiency. This dimensional optimization allows the sensor to be positioned at an optimal distance for detection precision while minimizing the overall device thickness.
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 design improves the reliability and efficiency of fingerprint authentication by ensuring stable light transmission and reception, reducing authentication errors and enhancing the overall performance of the fingerprint detection system.
Implementation Method 1
an optical layer disposed below the window and in which at least one transmission hole overlapping the fingerprint detection region is defined
Implementation Method 2
A refractive index of the protection layer is greater than a refractive index of the window
Data Source
AI summary
A display device includes a window on which a fingerprint detection region in which fingerprint information is detected is defined, an optical layer disposed below the window and in which at least one transmission hole overlapping the fingerprint detection region is defined, a protection layer disposed below the optical layer, and a sensor. A refractive index of the protection layer is greater than a refractive index of the window. A distance from the optical layer to the window is less than a distance from the optical layer to the sensor.