Quantum Dot Display Panel Patterning via Electrostatic Attraction

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Solution Overview

Problem

High-resolution AMOLED displays face challenges due to the limitations of the mask evaporation method, including difficult alignment, low yield, and inability to achieve smaller-area light emission, which restricts their competitiveness with LCDs.

Innovation Solution

A manufacturing method for a quantum dot display panel involving the formation of a functional layer with a processed region containing ions of one polarity and a quantum dot layer with opposite polarity, allowing for precise control of the quantum dot light-emitting structure layer pattern through mutual attraction forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mask evaporation method is used to form organic light-emitting layer, then light emission can be achieved, but alignment difficulty and low yield occur

Engineering Contradiction:

Improveproduct yieldVSAvoidalignment difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces the mechanical mask evaporation method with a chemical patterning approach using photodegradable substances. The organic light-emitting layer is formed through photochemical reactions that selectively decompose materials in specific regions, eliminating the need for physical masks and their associated alignment problems. This substitution of mechanical positioning with optical-chemical patterning resolves the alignment difficulty while maintaining manufacturing reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces photodegradable substances as intermediaries in the patterning process. These substances act as mediators that translate optical patterns into chemical changes, enabling precise spatial control of the organic light-emitting layer formation. The photodegradable substances decompose upon light exposure to create desired patterns without requiring mechanical masks, thereby improving both alignment accuracy and product yield.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If mask evaporation method is used, then organic light-emitting layer can be formed, but inability to realize smaller-area light emission occurs

Engineering Contradiction:

Improvelight emission area controlVSAvoidevaporation region control ability

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent replaces the mechanical constraint approach of mask evaporation with optical-chemical patterning using photodegradable substances. By controlling the exposure region with light, the invention achieves precise control over the area where the organic light-emitting layer forms. This optical control mechanism enables smaller-area light emission with higher precision than mechanical mask positioning can achieve.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent applies local quality by creating spatially differentiated regions with different chemical properties. The photodegradable substances decompose only in illuminated regions, creating localized areas with specific functional properties. This enables precise control of the organic light-emitting layer formation in specific small areas, achieving high manufacturing precision for light emission area control.

Inventive Principle:

Principle #3Local quality

3Manufacturing precision

If imprinting or printing techniques are used to form organic light-emitting layer, then pattern formation is achieved, but resolution is limited

Engineering Contradiction:

Improvedisplay resolutionVSAvoidpatterning technique complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent replaces mechanical imprinting and printing techniques with optical-chemical patterning. Instead of using physical stamps or print heads that limit resolution, the invention uses light exposure to trigger selective decomposition of photodegradable substances. This optical approach achieves higher display resolution by overcoming the physical limitations of mechanical patterning methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 method enables accurate control of the quantum dot light-emitting structure layer pattern, improving the display quality and overcoming the technical difficulties of high-resolution AMOLED production.

Implementation Method 1

a material of the first functional layer includes a photodegradable substance

Methodology Applied

Scientific EffectPhotodegradation: Photodissociation

Implementation Method 2

forming a quantum dot layer having a second polarity in the processed region, wherein the second polarity and the first polarity are opposite electrical polarities

Methodology Applied

Scientific EffectElectrostatic attraction: Ion Repulsion/Attraction

Data Source

PatentUS11611015B2Quantum dot display panel, manufacturing method thereof, and display device

Publication Date: 2023.03.21 BOE TECHNOLOGY GROUP CO LTD

AI summary

Disclosed are a quantum dot display panel, a manufacturing method thereof and a display device. The manufacturing method includes: forming a first functional layer on a substrate; processing the first functional layer so that the first functional layer includes a processed region and the processed region includes ions having a first polarity; forming a quantum dot layer having a second polarity in the processed region. The second polarity and the first polarity are opposite electrical polarities.