Pixel Layout for OLED and Quantum-Dot Light Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing configuration of organic light-emitting layers and quantum-dot light-emitting layers in display devices results in degradation of 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 enhance light extraction efficiency by overlapping them over respective pixel electrodes, allowing for independent control of light emission from each layer.
Engineering Contradictions & Design Principles
Engineering 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
Solution Approach 1:
The patent divides the light-emitting function into separate, non-overlapping regions: quantum-dot light-emitting layers are positioned in first pixels while organic light-emitting layers are positioned in second pixels. This spatial segmentation prevents light from one layer type from passing through the other layer type, thereby maintaining high light extraction efficiency for each layer while preserving manufacturing simplicity through a unified pixel structure approach.
2Volume of moving object
If the organic light-emitting layer is formed on the quantum-dot light-emitting layer, then the device structure is compact, but light from each layer passes through the other layer causing efficiency degradation
Solution Approach 1:
The patent transitions from a vertical stacking arrangement (one dimension) to a lateral adjacency arrangement (two dimensions). By positioning quantum-dot and organic light-emitting layers side-by-side in different pixel regions rather than stacking them vertically, the design maintains compact device structure while preventing light interference between layer types, thus preserving light extraction efficiency.
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 improves the light extraction efficiency from both quantum-dot and organic light-emitting layers, reducing degradation and enhancing display performance by allowing for optimized light emission from each layer.
Implementation Method 1
the first light-emitting layer includes a quantum-dot light-emitting layer that emits light of a first color
Implementation Method 2
the second light-emitting layer includes an organic light-emitting layer that emits light of a second color different from the first color
Data Source
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.