Integrated Display Layout for Fingerprint and Vein Imaging

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Solution Overview

Problem

The integration of fingerprint authentication modules in electronic devices increases component count and cost, and existing display devices lack the capability to capture both visible and infrared images for biometric authentication.

Innovation Solution

A display device incorporating a first light-emitting element for visible light, a second light-emitting element for infrared light, and a light-receiving element sensitive to both, with a light-blocking layer and resin layers to optimize component integration and image capture.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate fingerprint sensor module is added to the electronic device, then the authentication function is achieved, but the number of components and cost increase

Engineering Contradiction:

Improveauthentication functionVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the fingerprint sensor and display into a single integrated structure where the display panel serves dual purposes: visual display and fingerprint capture. The touch sensor layer and light-receiving elements are integrated within the display structure, eliminating the need for a separate fingerprint sensor module while maintaining authentication functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The display panel is designed to perform multiple functions simultaneously: it displays visual information, detects touch input, and captures fingerprint images for authentication. The light-emitting elements and light-receiving elements within the display enable the same structure to serve as both display and imaging components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a separate fingerprint sensor module is added to the electronic device, then the authentication function is achieved, but the cost increases

Engineering Contradiction:

Improveauthentication functionVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If the display device captures fingerprint images using visible light only, then the structure is simple, but the authentication accuracy is limited

Engineering Contradiction:

ImprovestructureVSAvoidauthentication accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent employs multiple light sources emitting at different wavelengths (visible light and infrared light) to illuminate the fingerprint. The light-receiving elements capture reflected light across different wavelength ranges, allowing the system to obtain fingerprint images with enhanced contrast and detail by utilizing both visible and infrared reflections from the fingerprint ridges and valleys.

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

Reduces the number of components and cost while enabling biometric authentication through fingerprint and vein image capture using both visible and infrared light, maintaining a high screen occupancy rate.

Implementation Method 1

The first light-emitting element has a function of emitting visible light upward

Methodology Applied

Scientific EffectLight emission: Light Emitting Diode

Implementation Method 2

The second light-emitting element has a function of emitting invisible light upward

Methodology Applied

Scientific EffectInvisible light emission: Light Emitting Diode

Implementation Method 3

The light-receiving element is a photoelectric conversion element having sensitivity to the visible light and the invisible light

Methodology Applied

Scientific EffectPhotoelectric conversion: Photoelectric Effect

Data Source

PatentUS12620258B2Display device, display module, and electronic device

Publication Date: 2026.05.05 SEMICON ENERGY LAB CO LTD

AI summary

A display device having both a touch detection function and a function of capturing an image of a shape of a fingerprint or a vein is provided. The display device includes a first substrate, a first light-emitting element, a second light-emitting element, a light-receiving element, a light-blocking layer, a first resin layer, and a second resin layer. The first light-emitting element and the light-receiving element are arranged over the first substrate, and the first resin layer is provided over the first light-emitting element and the light-receiving element. The light-blocking layer is provided over the first resin layer, and the second light-emitting element is provided over the light-blocking layer. The second resin layer is provided over the second light-emitting layer. The first light-emitting element emits visible light upward, and the second light-emitting element emits invisible light upward. The light-receiving element is a photoelectric conversion element having sensitivity to visible light and invisible light. In a plan view, the light-blocking layer includes a portion positioned between the first light-emitting element and the light-receiving element, and the second light-emitting element overlaps with the light-blocking layer and is positioned inside the outline of the light-blocking layer.