Quantum Dot Backlight Module Concave PCB Isolation Layer

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Solution Overview

Problem

Current quantum dot light sources are prone to failure under high temperatures and oxygen exposure, and their manufacturing costs are high due to poor particle uniformity and significant light decay of luminescent materials in LED backlight modules.

Innovation Solution

A quantum dot light source design featuring a concave circuit board with receiving chambers for light-emitting diodes, a quantum dot film with an isolation layer to protect against oxygen and moisture, and a bonding layer to secure the film, using a metal substrate and copper layer for electrical connection, and employing blue light-emitting diodes to enhance color saturation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If quantum dot is used in backlight module, then color gamut performance is improved, but reliability deteriorates due to failure under high temperature and oxygen exposure

Engineering Contradiction:

Improvecolor gamut performanceVSAvoidstability under high temperature and oxygen

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent introduces an isolation layer made of inert materials (such as silicon oxide, silicon nitride, or parylene) that creates a protective barrier around the quantum dot film, effectively isolating it from oxygen and moisture in the environment. This inert environment prevents oxidation and degradation of the quantum dots, thereby maintaining their optical properties and reliability under high temperature conditions.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent employs thin film structures (isolation layer and bonding layer) that conformally cover the quantum dot film and surrounding areas. These flexible thin films provide comprehensive protection against environmental factors while maintaining the structural integrity and optical performance of the quantum dot layer.

Inventive Principle:

Principle #30Flexible shells and thin films

2Ease of manufacture

If luminescent material is used in LED backlight, then manufacturing is simplified, but performance deteriorates due to significant light decay and poor particle uniformity

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidlight decay and color performance

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

The patent transitions from using traditional luminescent materials to quantum dot materials, representing a fundamental change in the optical parameters and material properties. Quantum dots exhibit size-dependent emission wavelengths and superior photostability, enabling better color performance and reduced light decay while maintaining manufacturability through solution processing techniques.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite material structures including the quantum dot film combined with isolation layers and bonding layers. This composite approach integrates the optical advantages of quantum dots with the protective and structural benefits of surrounding materials, achieving both high performance and manufacturing feasibility.

Inventive Principle:

Principle #40Composite materials

3Illumination intensity

If quantum dot film is extensively used to cover LED, then color performance is improved, but manufacturing cost increases

Engineering Contradiction:

Improvecolor saturationVSAvoidmanufacturing cost

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent applies the quantum dot film selectively in specific regions rather than uniformly across the entire backlight module. The isolation layer is designed to cover critical areas where quantum dots are most vulnerable, while the bonding layer provides structural support. This localized approach maintains color performance in essential areas while reducing overall material consumption and manufacturing costs.

Inventive Principle:

Principle #3Local quality

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 extends the life of quantum dot films, reduces manufacturing costs, and improves color gamut performance in liquid crystal panels by using less quantum dot film while maintaining stable light-emitting quality.

Implementation Method 1

A quantum dot can emit fluorescence under the excitation of the light

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Implementation Method 2

an isolation layer which surrounds the quantum dot layer

Methodology Applied

Scientific EffectPhysical barrier protection:

Data Source

PatentUS10088132B2Quantum dot light source and quantum dot backlight module

Publication Date: 2018.10.02 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

A quantum dot light source and a quantum dot backlight module are disclosed. The quantum dot light source includes a light strip including a circuit board and multiple light-emitting diodes, wherein an outer side surface of the circuit board is concave to provide multiple receiving chambers, the receiving chambers are used to install the light-emitting diodes, and the light-emitting diodes do not exceed the outer side surface of the circuit board, and a quantum dot film covering on the receiving chambers of the circuit board. The manufacturing cost of the quantum dot light source of the present invention is lower, and the light-emitting quality is stable.