Fingerprint Identification Module with Shading Gap

Solution Overview

Problem

Existing fingerprint identification devices face challenges in reducing device size and manufacturing costs while maintaining effective fingerprint recognition capabilities.

Innovation Solution

The fingerprint identification module incorporates a color filter substrate with a first shading member and a protective cover with a second shading member, maintaining a gap of 0.2 mm to 0.7 mm in thickness direction, allowing the light beam to pass through for fingerprint recognition without the need for the light source to be positioned near the protective cover or the cover to have an optical coating, thus reducing device size and costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the light source is positioned near the protective cover or the cover is given an optical coating to enhance light transmission, then fingerprint recognition capability is improved, but device size and manufacturing costs increase

Engineering Contradiction:

Improvefingerprint recognition capabilityVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent divides the optical path into two separate regions: one for light emission (through the color filter substrate) and one for light reception (through the protective cover). This segmentation allows each component to be optimized independently, eliminating the need for complex optical coatings on the protective cover while maintaining effective fingerprint recognition capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a gap between the color filter substrate and protective cover as an intermediary optical path. This gap allows light to transmit between the two components without requiring the protective cover to have special optical properties, thereby simplifying the overall structure and reducing manufacturing costs while maintaining recognition capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the light source is positioned near the protective cover or the cover is given an optical coating to enhance light transmission, then fingerprint recognition capability is improved, but manufacturing costs increase

Engineering Contradiction:

Improvefingerprint recognition capabilityVSAvoidmanufacturing costs

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent divides the optical path into two separate regions: one for light emission (through the color filter substrate) and one for light reception (through the protective cover). This segmentation allows each component to be optimized independently, eliminating the need for complex optical coatings on the protective cover while maintaining effective fingerprint recognition capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses standard, readily available materials for the protective cover without requiring expensive optical coatings. By accepting that the protective cover serves primarily protective functions rather than optical enhancement functions, the design prioritizes cost-effective manufacturing while achieving the necessary fingerprint recognition performance through the color filter substrate's optical properties.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Volume of stationary object

If the gap between the first shading member and second shading member is reduced to minimize device thickness, then device size is reduced, but light transmission for fingerprint recognition is compromised

Engineering Contradiction:

Improvedevice sizeVSAvoidlight transmission

Core Design Contradiction:

Volume of stationary objectVSIllumination intensity

Solution Approach 1:

The patent optimizes the gap dimensions within the thickness direction to achieve an optimal balance between device compactness and light transmission. By carefully controlling the gap size (0.01 mm to 0.5 mm) in the thickness dimension, the design maintains effective light transmission for fingerprint recognition while minimizing the overall device profile.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent specifies precise parameter ranges for the gap between the color filter substrate and protective cover (0.01 mm to 0.5 mm) to optimize both light transmission and device thickness. This parameter optimization ensures sufficient light intensity for reliable fingerprint recognition while maintaining a compact device form factor.

Inventive Principle:

Principle #35Parameter changes

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 light intensity and reduces the overall size and manufacturing costs of the fingerprint identification device without compromising fingerprint recognition performance.

Implementation Method 1

The color filter substrate includes a first shading member. The protective cover includes a second shading member. There is a gap between the first shading member and the second shading member in the thickness direction of the fingerprint identification module

Methodology Applied

Scientific EffectLight blocking/shading: Absorption (EM radiation)

Data Source

PatentUS11631272B2Fingerprint identification device

Publication Date: 2023.04.18 INNOLUX CORP

AI summary

A fingerprint identification module and a fingerprint identification device are provided. The fingerprint identification module includes a color filter substrate and a protective cover. The color filter substrate includes a first shading member. The protective cover is disposed on the color filter substrate and includes a second shading member. The second shading member faces the color filter substrate. There is a gap between the first shading member and the second shading member in a thickness direction of the fingerprint identification module, and the gap is within a range of 0.2 mm to 0.7 mm.