Optical Sensing Module Light-Blocking Element Stray Noise
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Solution Overview
Problem
Current optical sensing modules are affected by stray light, which reduces the accuracy of fingerprint identification due to noise generation, compromising user experience in consumer electronic devices.
Innovation Solution
An optical sensing module with a light-blocking element is integrated between the optical sensing layer and the display panel, featuring multiple light-blocking layers with different-sized openings to block undesired light, enhancing signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical sensing modules are used in fingerprint identification devices, then identification functionality is provided, but stray light affects sensing accuracy by generating noise
Solution Approach 1:
A light-blocking element is introduced as an intermediary component between the display panel and the optical sensing layer. This element selectively blocks stray light from reaching the optical sensing layer while allowing intended light to pass through, thereby eliminating harmful interference without compromising the sensing function
Solution Approach 2:
The light-blocking element is designed with a segmented structure featuring multiple light-blocking layers, each containing openings of different sizes. This segmentation allows the structure to selectively block specific wavelengths or directions of light while maintaining transparency for intended optical signals, thus resolving the contradiction between blocking stray light and maintaining sensing accuracy
2Reliability
If a light-blocking element is added to block stray light, then noise interference is reduced, but device structure becomes more complex
Solution Approach 1:
The light-blocking element is merged with the existing optical assembly structure, combining the light-blocking function with the microlens array and substrate. By integrating multiple functions into a single component or assembly, the overall device complexity is minimized while still achieving effective stray light blocking
Solution Approach 2:
The light-blocking element employs local quality differentiation through its segmented structure with varying opening sizes in different layers. This allows different regions of the element to have different optical properties, enabling selective light blocking while maintaining overall structural compactness and minimizing complexity
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 integration of a light-blocking element significantly reduces noise interference, improving the accuracy and reliability of optical sensing modules in electronic devices, particularly in fingerprint identification systems.
Implementation Method 1
The light-blocking element overlaps a portion of the optical sensing layer in a normal direction of the optical sensing layer. The optical assembly includes a plurality of light-blocking layers
Data Source
AI summary
An electronic device are provided. The electronic device includes a display panel and an optical sensing module. The optical sensing module is disposed on a side of the display panel and includes an optical sensing layer, an optical assembly, and a light-blocking element. The optical assembly is disposed between the optical sensing layer and the display panel. The light-blocking element overlaps a portion of the optical sensing layer in a normal direction of the optical sensing layer. The optical assembly includes a plurality of light-blocking layers, and at least a portion of the plurality of light-blocking layers have different-sized openings.