Pixel Electrode Layout for Quantum-Dot and OLED Light Extraction

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Solution Overview

Problem

The existing configuration of organic light-emitting layers and quantum-dot light-emitting layers in display devices leads to degradation in light extraction efficiency due to the sequential stacking of layers, causing light from one layer to pass through the other.

Innovation Solution

A display device is designed with a pixel structure where a quantum-dot light-emitting layer and an organic light-emitting layer are positioned to emit different colors, with each layer overlapping a respective pixel electrode, enhancing light extraction efficiency by optimizing the light emission paths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the organic light-emitting layer and quantum-dot light-emitting layer are stacked sequentially, then the device structure is simplified and manufacturing is easier, but the light extraction efficiency from each layer degrades

Engineering Contradiction:

Improveease of manufactureVSAvoidlight extraction efficiency

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The light-emitting layers are divided into separate pixel structures rather than being stacked. Each pixel electrode overlaps with only one type of light-emitting layer (either organic or quantum-dot), creating spatially separated emission regions that prevent light from one layer from passing through the other layer and improving extraction efficiency while maintaining manufacturing simplicity through simultaneous formation of both layer types

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a vertical stacking arrangement (one dimension) to a lateral spatial arrangement where different light-emitting layers are positioned at different horizontal positions over respective pixel electrodes (adding a second dimensional aspect). This dimensional change allows both layer types to coexist without light interference while maintaining a planar device structure

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 configuration significantly improves the light extraction efficiency from both quantum-dot and organic light-emitting layers, reducing degradation and enhancing display performance.

Implementation Method 1

a first light-emitting layer formed over the first pixel electrode and overlapping the first pixel electrode... the first light-emitting layer includes a quantum-dot light-emitting layer that emits light of a first color

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

a second light-emitting layer formed over the second pixel electrode and overlapping the second pixel electrode... the second light-emitting layer includes an organic light-emitting layer that emits light of a second color different from the first color

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11804182B2Display device with pixel structure capable of extracting light from quantum-dot light-emitting layer and organic light-emitting layer of pixel structure

Publication Date: 2023.10.31 SHARP KK

AI summary

A first pixel electrode electrically connected to a first transistor, a second pixel electrode electrically connected to a second transistor, a first light-emitting layer formed over the first pixel electrode and overlapping the first pixel electrode, a second light-emitting layer formed over the second pixel electrode and overlapping the second pixel electrode are provided, the first light-emitting layer includes a quantum-dot light-emitting that emits light of a first color, and the second light-emitting layer includes an organic light-emitting layer that emits light of a second color different from the first color.