Texture Recognition Light Path Structure for Ambient Light Filtering
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Solution Overview
Problem
Ambient light interference causes inaccurate fingerprint recognition due to its intensity being greater than the intensity of detected light reflected from the fingerprint, leading to inaccurate texture information acquisition.
Innovation Solution
A texture recognition assembly with a light path structure comprising multiple light shielding layers and light transmitting layers, where light transmitting holes are arranged to form non-overlapping channels with a specific inclination angle, collimating light to reduce ambient light interference and enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional light path structure is used, then light transmission is achieved, but ambient light interference causes inaccurate texture recognition
Solution Approach 1:
The light path structure is segmented into multiple light shielding layers with light transmitting holes arranged in specific patterns. Each layer segments the light paths, allowing only light within specific angular ranges to reach the optical sensing structure, thereby filtering out ambient light while transmitting detection light
Solution Approach 2:
Different regions of the light path structure have different light transmission properties. The light transmitting holes are selectively positioned and sized to create local quality variations, allowing the structure to transmit detection light from specific angles while blocking ambient light from other directions
2Object-affected harmful factors
If light shielding layers are added to block ambient light, then ambient light interference is reduced, but device complexity increases
Solution Approach 1:
Multiple light shielding layers are merged into a single integrated light path structure component. The layers are stacked and aligned to form a unified structure that performs multiple light filtering functions simultaneously, reducing the need for separate components and simplifying the overall device assembly
Solution Approach 2:
The light path structure serves multiple functions: it transmits detection light, blocks ambient light, and defines light paths. By making the structure multi-functional, the patent avoids adding separate components for each function, thereby managing complexity while achieving multiple objectives
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 ambient light interference, improving the accuracy of texture recognition by maintaining a higher proportion of detection light intensity relative to ambient light intensity, even under strong ambient conditions.
Implementation Method 1
a light path structure, which is on a side of the optical sensing structure distal to the substrate, at least in the texture recognition region and does not cover the binding region, and includes a plurality of light transmitting channels such that light incident on the light path structure passes through the light path structure only via the light transmitting channels
Implementation Method 2
the light path structure includes at least two light shielding layers and a light transmitting layer located between any adjacent two of the at least two light shielding layers
Data Source
AI summary
A texture recognition assembly (100) includes: a substrate (1); an optical sensing structure (2) on the substrate; and a light path structure (3) on a side of the optical sensing structure distal to the substrate and including an inclined light transmitting channel (Q) such that light incident on the light path structure can only pass through the light transmitting channel. The light path structure includes at least two light shielding layers (31, 31a, 31b, 31c) and a light transmitting layer (32, 32a, 32b) located between any adjacent two of the at least two light shielding layers, the light shielding layer (31a) closest to the optical sensing structure includes a first light transmitting hole (311a), the light shielding layer (31b) farthest away from the optical sensing structure includes a second light transmitting hole (322b), the first light transmitting hole and the second light transmitting hole define the light transmitting channel.