Fingerprint Identification Circuit Light Shielding Design
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Solution Overview
Problem
Fingerprint identification circuits in mobile products face reduced service life and reliability due to exposure to ambient light when not in use, as they lack a black matrix to shield external light, which affects the fingerprint identification member.
Innovation Solution
A fingerprint identification circuit with a light-shielding member and a partially-transparent member on an opposite substrate, where the orthogonal projection of the partially-transparent member overlaps the fingerprint identification member, allowing light during use while shielding ambient light during non-use, and includes strip-like light-shielding patterns made of metal or black matrix material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no black matrix is arranged at the fingerprint identification member region, then the fingerprint identification member can receive reflected light beams, but external ambient light beams can pass through and adversely affect the service life and reliability of the fingerprint identification member
Solution Approach 1:
The opposite substrate is segmented into different functional regions: a light-shielding member (black matrix) for protection and a partially-transparent member for light transmission. This segmentation allows simultaneous achievement of ambient light shielding and operational light reception for the fingerprint identification member
Solution Approach 2:
Different regions of the opposite substrate are assigned different optical properties: the light-shielding member has light-blocking properties to protect the fingerprint identification member during non-use, while the partially-transparent member has light-transmitting properties to allow reflected light beams to reach the fingerprint identification member during operation
2Reliability
If a light-shielding member is added to block ambient light, then the reliability of the fingerprint identification member is improved, but the structure complexity and manufacturing difficulty increase
Solution Approach 1:
The light-shielding member and partially-transparent member are merged into a single opposite substrate structure, where both functional elements are integrated onto the same substrate. This reduces overall device complexity compared to adding separate shielding components while maintaining the protective function
Solution Approach 2:
The opposite substrate serves multiple functions: it acts as both a structural support and incorporates the light-shielding member for protection and the partially-transparent member for light transmission. This multi-functionality reduces the need for additional separate components, simplifying the overall device structure
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 enhances the accuracy of fingerprint identification, prolongs the service life, and improves the reliability of the fingerprint identification member by controlling light exposure, ensuring effective operation and extended lifespan.
Implementation Method 1
The opposite substrate comprises a light-shielding member and a partially-transparent member... the orthogonal projection of the partially-transparent member onto the array substrate at least partially overlaps an orthogonal projection of the fingerprint identification member onto the array substrate
Data Source
AI summary
A fingerprint identification circuit, a method for manufacturing the fingerprint identification circuit, and a display device are provided. The fingerprint identification circuit includes: an array substrate and an opposite substrate arranged opposite to the array substrate; a fingerprint identification member arranged at a side of the array substrate proximate to the opposite substrate; and a backlight source arranged at a side of the array substrate distal to the opposite substrate. A light-shielding member and a partially-transparent member are arranged on the opposite substrate. An orthogonal projection of the partially-transparent member onto the array substrate at least partially overlaps an orthogonal projection of the fingerprint identification member onto the array substrate.