Layered OLED–Quantum Dot Display for Color Purity and Power Control

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Solution Overview

Problem

The use of quantum dots in display devices leads to increased power consumption while maintaining high color purity, and organic light-emitting layers suffer from limited color reproduction and temporal deterioration.

Innovation Solution

A display device with a layered structure comprising a first element layer and a second element layer, where the first element layer includes an organic light-emitting layer and a quantum dot layer, and a control unit that generates data corresponding to the first and second element layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a quantum dot is used in a display portion, then color purity is improved, but power consumption increases

Engineering Contradiction:

Improvecolor purityVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The display device is divided into two separate element layers: a first element layer with an organic light-emitting layer and a second element layer with a quantum dot light-emitting layer. Each layer can be independently controlled by separate data signals, allowing selective activation based on image characteristics. This segmentation enables the system to use only the quantum dot layer for color-critical content while using the organic layer for other content, thereby reducing overall power consumption while maintaining color purity where needed.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If an organic light-emitting layer is used, then ease of manufacture is improved, but color reproduction is limited and temporal deterioration occurs

Engineering Contradiction:

Improveease of manufactureVSAvoidcolor reproduction

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The invention merges two different light-emitting technologies (organic light-emitting and quantum dot light-emitting) into a single display device with two stacked element layers. Each layer contributes its strengths: the organic light-emitting layer provides ease of manufacture and good luminance, while the quantum dot light-emitting layer provides superior color reproduction. By combining these technologies and enabling independent control, the system achieves both ease of manufacture and excellent color reproduction simultaneously.

Inventive Principle:

Principle #5Merging (Combining)

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 reduces power consumption and enhances color reproduction by optimizing the operation of the display device.

Implementation Method 1

a first element layer including an organic light-emitting layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

a quantum dot light-emitting layer that emits light

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS12424168B2Display device

Publication Date: 2025.09.23 SHARP DISPLAY TECHNOLOGY CORP

AI summary

A display device includes a display portion including a first element layer including an organic light-emitting layer, and a second element layer including a quantum dot light-emitting layer that emits light of the same color as the organic light-emitting layer and overlapping the first element layer in a plan view viewed in a normal direction of the organic light-emitting layer, and a control unit that generates first data corresponding to the first element layer and second data corresponding to the second element layer based on input data.