Composite Quantum Dot Optical Film With Dual-Prism Brightness

Solution Overview

Problem

Existing quantum-dot films require barrier layers for water and oxygen resistance, increasing thickness and manufacturing complexity, and are limited by the use of heavy metals like Cd in CdSe quantum dots.

Innovation Solution

A quantum-dot composite film with a binder and dispersed quantum dots that are water-resistant and oxygen-resistant without a barrier layer, combined with an optical brightness enhancement layer featuring prisms, enhancing brightness and reducing thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If barrier layers are formed over/on each surface of the quantum-dot layer for water and oxygen resistance, then environmental resistance is improved, but total thickness increases and manufacturing complexity increases

Engineering Contradiction:

Improveenvironmental resistanceVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes the barrier layer component from the quantum-dot film structure. The quantum-dot layer itself is engineered to provide water and oxygen resistance through material composition and surface treatment, eliminating the need for separate barrier layers and simplifying the manufacturing process while maintaining environmental resistance

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent combines the quantum-dot layer and barrier layer functions into a single integrated quantum-dot layer. The quantum-dot layer is designed to simultaneously provide optical functionality and environmental resistance, merging multiple layers into one to reduce thickness and manufacturing complexity

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If barrier layers are formed over/on each surface of the quantum-dot layer for water and oxygen resistance, then environmental resistance is improved, but total thickness increases

Engineering Contradiction:

Improveenvironmental resistanceVSAvoidtotal thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent removes the barrier layer component from the quantum-dot film structure. The quantum-dot layer itself is engineered to provide water and oxygen resistance through material composition and surface treatment, eliminating the need for separate barrier layers and simplifying the manufacturing process while maintaining environmental resistance

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent combines the quantum-dot layer and barrier layer functions into a single integrated quantum-dot layer. The quantum-dot layer is designed to simultaneously provide optical functionality and environmental resistance, merging multiple layers into one to reduce thickness and manufacturing complexity

Inventive Principle:

Principle #5Merging (Combining)

3Illumination intensity

If CdSe quantum dots are used for high luminance efficiency and color gamut performance, then optical performance is improved, but environmental harmfulness increases due to heavy metal content

Engineering Contradiction:

Improveluminance efficiencyVSAvoidheavy metal content

Core Design Contradiction:

Illumination intensityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the material composition parameters of the quantum dots by incorporating polymer materials with specific chemical structures that contain elements replacing toxic heavy metals. This maintains the quantum confinement effect and optical performance while achieving RoHS compliance by eliminating Cd and other harmful substances

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite quantum-dot structures combining organic polymer materials with quantum-confined inorganic cores. This composite approach allows the quantum dots to maintain high luminance efficiency and color gamut while the polymer matrix provides environmental stability and eliminates toxic heavy metal content

Inventive Principle:

Principle #40Composite materials

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 film achieves at least twice the brightness of single quantum-dot films while being thinner and more cost-effective, with improved environmental resistance and simplified manufacturing.

Implementation Method 1

The colored spectrum can be generated when the quantum dots are excited by light or electricity. The color of the excited light is determined according to the material and the size of the quantum dot.

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

an optical brightness enhancement layer featuring prisms, enhancing brightness

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS12411271B2Composite quantum dot optical film comprising first and second optical prism films

Publication Date: 2025.09.09 UBRIGHT OPTRONICS CORP

AI summary

The present invention discloses a quantum-dot composite film comprising: a quantum-dot prism film, comprising a quantum-dot layer and a first plurality of prisms disposed over the quantum-dot layer, wherein a first optical prism film and a second optical prism film are disposed over the quantum-dot prism film for increasing the brightness level of the quantum-dot prism film.