Color Conversion Panel Low Refractive Index Layer

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Solution Overview

Problem

Current display devices with color conversion panels using semiconductor nanocrystals face challenges in simplifying the manufacturing process while maintaining high display quality and reducing external light reflectance.

Innovation Solution

A color conversion panel design featuring a low refractive index layer with specific thickness and pigment/dye content, overlapping color filters, and semiconductor nanocrystals, which absorbs external light and enhances color display quality without a separate light blocking member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a separate light blocking member is added to reduce external light reflectance, then external light reflectance is reduced, but device complexity and manufacturing process become more complex

Engineering Contradiction:

Improveexternal light reflectanceVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent combines the light blocking function with the low refractive index layer by incorporating blue pigment or dye into the layer. This merging eliminates the need for a separate light blocking member, thereby reducing device complexity while maintaining the ability to reduce external light reflectance through selective wavelength absorption.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The low refractive index layer is designed to serve multiple functions simultaneously: reducing external light reflectance through selective absorption of blue light wavelengths, maintaining optical performance for display colors, and providing a low refractive index environment. This multi-functionality eliminates the need for separate dedicated light blocking components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If a separate light blocking member is added to reduce external light reflectance, then external light reflectance is reduced, but manufacturing process becomes more complex

Engineering Contradiction:

Improveexternal light reflectanceVSAvoidmanufacturing process

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The light blocking function is merged into the low refractive index layer formation process by incorporating blue pigment or dye during the same manufacturing steps. This eliminates the need for separate manufacturing processes for light blocking members, thereby simplifying the overall manufacturing process while achieving the same light reflectance reduction effect.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If blue pigment or dye is added to the low refractive index layer to absorb external light, then external light reflectance is reduced, but the layer's optical properties may be compromised

Engineering Contradiction:

Improveexternal light reflectanceVSAvoidoptical properties

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies local quality by selectively absorbing specific wavelengths (blue light from external sources) while maintaining transparency and optical performance for the display wavelengths (red, green, and blue display colors). The blue pigment or dye is incorporated at controlled concentrations (1-2 wt%) to achieve wavelength-selective absorption without compromising overall optical properties.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by carefully controlling the concentration of blue pigment or dye (1-2 wt%) and the thickness of the low refractive index layer (1-6 μm) to achieve optimal balance between external light absorption and display optical performance. These parameter optimizations ensure that external blue light is absorbed while display quality is maintained.

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

The solution simplifies the manufacturing process and reduces external light reflectance, resulting in a display device with improved color display quality and excellent color gamut.

Implementation Method 1

a low refractive index layer disposed on the substrate, the first color filter, and the second color filter, the low refractive index layer including at least one of a first blue pigment and a first blue dye

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

a first color conversion layer overlapping the first color filter and including a semiconductor nanocrystal, a second color conversion layer overlapping the second color filter and including a semiconductor nanocrystal

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS11950482B2Color conversion panel and display device including the same

Publication Date: 2024.04.02 SAMSUNG DISPLAY CO LTD

AI summary

A color conversion panel includes a first color filter and a second color filter that are disposed on a substrate, a low refractive index layer disposed on the substrate, the first color filter, and the second color filter, the low refractive index layer including at least one of a first blue pigment and a first blue dye, a first color conversion layer overlapping the first color filter and including a semiconductor nanocrystal, a second color conversion layer overlapping the second color filter and including a semiconductor nanocrystal, and a transmissive layer that overlaps the low refractive index layer.