Fingerprint Sensor Appearance Effect Layer Design

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Solution Overview

Problem

Fingerprint identification modules lack diversity in appearance effects, failing to achieve texture pattern appearances.

Innovation Solution

A fingerprint identification apparatus comprising a circuit board, fingerprint sensor, appearance effect layer, and covering layer, where the appearance effect layer includes a color layer and texture layer, with the texture layer formed using a transparent colloid and the color layer prepared via non-conductive vacuum metallization or screen-printing, and a surface hardening layer applied using transparent paint or ink.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a simple cover plate is used to protect the fingerprint sensor, then the sensor is protected and sensitivity is improved, but the appearance effect lacks diversity and texture patterns cannot be achieved

Engineering Contradiction:

Improvesensor protection and sensitivityVSAvoidappearance effect diversity

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The appearance effect layer is divided into multiple independent layers: color layer(s) for base color and texture layer(s) for surface patterns. This segmentation allows each layer to contribute specific appearance properties, enabling diverse texture patterns (matte, glossy, metallic, etc.) while maintaining sensor protection functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses composite material structures where different material layers (color layers and texture layers) are combined to achieve complex appearance effects. The color layer provides base coloration while texture layers provide surface patterns, creating composite appearance properties that neither layer could achieve alone.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If multiple layers are added to achieve texture patterns, then appearance diversity is improved, but the total thickness increases

Engineering Contradiction:

Improveappearance effect diversityVSAvoidtotal thickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The appearance effect layer uses thin film structures where color layers and texture layers are deposited as ultra-thin coatings rather than bulk materials. This allows multiple functional layers to be stacked while maintaining minimal total thickness, as each layer contributes appearance functionality without significant thickness accumulation.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

Instead of achieving appearance effects through thickness (adding bulk layers), the patent transitions to achieving effects through surface dimension modifications. Texture layers create optical effects through surface microstructures and patterns rather than through thickness, allowing diverse appearances with minimal thickness increase.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 provides a comprehensive appearance effect, addressing the limitations of conventional methods by enabling diverse texture and color patterns, enhancing the appearance of fingerprint identification modules in mobile devices without compromising sensor functionality.

Implementation Method 1

the color layer prepared by non-conductive vacuum metallization

Methodology Applied

Scientific EffectVacuum metallization: Physical Vapour Deposition

Implementation Method 2

the texture layer formed using a transparent colloid

Methodology Applied

Scientific EffectSpraying: Spray

Implementation Method 3

the surface hardening layer is a transparent hardened protection layer prepared by means of spraying using a transparent paint or ink

Methodology Applied

Scientific EffectSpraying: Spray

Data Source

PatentEP3379391B1Fingerprint recognition device and manufacturing method therefor

Publication Date: 2020.12.02 SHENZHEN GOODIX TECH CO LTD

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AI summary

The present disclosure relates to the technical filed of fingerprint identification, and in particular, relates to a fingerprint identification apparatus and a method for manufacturing the same. The fingerprint identification apparatus includes: a circuit board, a fingerprint sensor, an appearance effect layer, and a covering layer; wherein the fingerprint sensor is arranged on the circuit board, the covering layer is coated over the fingerprint sensor, the appearance effect layer is arranged between the fingerprint sensor and the covering layer, and the appearance effect layer comprises a texture layer and a color layer. In the fingerprint identification apparatus and the method for manufacturing a fingerprint identification apparatus according to the above embodiments of the present disclosure, a texture layer is coated over on the fingerprint sensor or under the cover, and an appearance effect layer is formed by the texture layer and the color layer, such that an appearance effect of the fingerprint identification apparatus is comprehensively reflected. In this way, the problems that the conventional appearance preparation process of the fingerprint identification module is limited and the prepared appearance effect lacks diversity are solved, and the requirements on diversity of the appearance effect imposed by the fingerprint identification apparatus and such mobile terminals as mobile phones employing the fingerprint identification apparatus are accommodated.