Display Device Optical Filter Integration for Thin Biometric Sensing

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Solution Overview

Problem

Existing display devices integrating biometric sensors face challenges with increased thickness and manufacturing costs due to separate optical filters, which are not integrated with the optical pattern layer.

Innovation Solution

The optical filter is integrally formed with the optical pattern layer having a collimator array structure, reducing the need for additional space and manufacturing processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the optical filter is formed as a separate part from the optical pattern layer, then the optical filter can effectively block light of specific wavelengths, but the thickness and manufacturing cost of the display device increase

Engineering Contradiction:

Improvelight blocking effectivenessVSAvoiddisplay device thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The optical filter is integrated into the optical pattern layer to form a single unified structure. The optical pattern layer includes both the collimator array structure and the optical filter, eliminating the need for a separate optical filter component. This merging reduces the overall thickness of the display device while maintaining the light blocking effectiveness of the optical filter.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If the optical filter is formed as a separate part from the optical pattern layer, then the optical filter can effectively block light of specific wavelengths, but the manufacturing cost of the display device increases

Engineering Contradiction:

Improvelight blocking effectivenessVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Length of stationary object

If the optical filter is integrated with the optical pattern layer, then the thickness and manufacturing cost are reduced, but the optical structure becomes more complex

Engineering Contradiction:

Improvedisplay device thicknessVSAvoidoptical structure complexity

Core Design Contradiction:

Length of stationary objectVSDevice complexity

Solution Approach 1:

The optical pattern layer is divided into multiple layers including a first optical pattern layer and a second optical pattern layer. The optical filter is positioned between these layers, allowing the complex optical structure to be organized into distinct functional segments. This segmentation manages the complexity by creating a modular layered structure rather than a monolithic design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The optical filter is positioned in a specific spatial relationship between the first and second optical pattern layers, utilizing the third dimension (vertical stacking) to organize the optical components. This dimensional arrangement manages structural complexity by distributing components across multiple layers rather than concentrating them in a single plane.

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

This integration reduces the thickness and manufacturing costs of the display device while maintaining effective light management and biometric sensing capabilities.

Implementation Method 1

the optical filter, which may block transmission of light having a suitable wavelength (e.g., a predetermined wavelength), for example, such as about 580 nm or greater

Methodology Applied

Scientific EffectOptical filtering: Absorption (EM radiation)

Implementation Method 2

the optical pattern layer having a collimator array structure

Methodology Applied

Scientific EffectCollimation: Lens

Data Source

PatentEP4372431B1Method of manufacturing a display device

Publication Date: 2025.11.05 SAMSUNG DISPLAY CO LTD

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AI summary

A display device includes: a photo sensor layer to receive light reflected from an external object; a substrate on the photo sensor layer; an optical pattern layer on the substrate, the optical pattern layer including a light blocking portion, and a light transmitting portion corresponding to an opening penetrating the light blocking portion in one direction; an optical filter in the light transmitting portion of the optical pattern layer; and a light emitting device layer on the optical pattern layer.