Multilayer Color Filter Display for Reduced Specular Reflection

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Solution Overview

Problem

Existing display devices face challenges in reducing specular reflection without degrading color characteristics.

Innovation Solution

A display device design incorporating a color filter layer with multiple layers and specific refractive indices, along with light blocking patterns and wavelength conversion substrates, to manage light emission and reduce specular reflection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a conventional single-layer color filter is used, then the device structure is simple, but specular reflection is high and color characteristics are degraded

Engineering Contradiction:

Improvecolor filter structureVSAvoidspecular reflection

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The color filter is divided into multiple layers (first color filter layer and second color filter layer) with different refractive indices. Each layer is segmented to perform specific optical functions: the first layer with higher refractive index reduces specular reflection, while the second layer with lower refractive index maintains color characteristics. This segmentation resolves the contradiction by breaking down the single-layer structure into functional layers.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the color filter structure are assigned different local qualities through varying refractive indices. The first color filter layer has a higher refractive index specifically targeted at reducing specular reflection, while the second layer has a lower refractive index to preserve color characteristics. This local differentiation allows simultaneous optimization of both anti-reflection and color properties.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If a multi-layer color filter with different refractive indices is implemented, then specular reflection is reduced, but device complexity increases

Engineering Contradiction:

Improvespecular reflectionVSAvoidcolor filter structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The multi-layer color filter structure serves multiple functions simultaneously: the first layer with higher refractive index provides anti-specular reflection functionality, while the second layer with lower refractive index maintains color characteristics. This multi-functionality design allows the system to achieve both reflection reduction and color preservation without requiring separate independent components, thus managing the complexity effectively.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If the first color filter layer has high refractive index, then specular reflection is reduced, but color characteristics may be affected

Engineering Contradiction:

Improvespecular reflectionVSAvoidcolor characteristics

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The color filter structure employs asymmetric layering where the first color filter layer has a higher refractive index optimized for reducing specular reflection, while the second color filter layer has a lower refractive index specifically optimized for maintaining color characteristics. This asymmetric design with different refractive indices in different layers allows the system to prioritize anti-reflection in the first layer while the second layer compensates to preserve color accuracy.

Inventive Principle:

Principle #4Asymmetry

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 specular reflection while maintaining high-quality color characteristics, enhancing the display performance without compromising image quality.

Implementation Method 1

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

The self-light emitting element may include two opposing electrodes and an emission layer interposed therebetween. In case that the self-light emitting element is the organic light emitting element, electrons and holes provided from the two electrodes recombine in the emission layer to generate an exciton, the generated exciton changes from an excited state to a ground state, and light may be emitted.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12439798B2Display device with improved color filter

Publication Date: 2025.10.07 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes display area; a non-display area; a display substrate; and a color conversion substrate disposed on the display substrate, the display substrate includes a first base portion, and a light emitting element disposed in the display area on the first base portion, the color conversion substrate includes a second base portion facing the first base portion, and a color filter layer disposed between the second base portion and the light emitting element, the display area includes a first light emitting area emitting first light, the color filter layer includes a first color filter disposed in the first light emitting area, and the first color filter includes at least two layers.