OLED Array Substrate Blue Layer Segmentation for Color Decay Compensation
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Solution Overview
Problem
Organic light-emitting diode (OLED) displays face a color shift issue due to the differential decay rates of blue, red, and green organic light-emitting material layers, leading to reduced display life and luminance, as blue layers degrade faster, causing a warm tone and reduced resolution when trying to maintain white balance.
Innovation Solution
An array substrate with a light-emitting functional layer comprising organic light-emitting material layers of different colors, where the blue layer has a higher decay rate, is designed with sub-layers and a third electrode to enable decay compensation by switching between sub-layers, maintaining display quality and extending device life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the area of the blue organic light-emitting material layer is increased to balance color decay, then color stability is improved, but display resolution is reduced
Solution Approach 1:
The blue organic light-emitting material layer is divided into multiple sub-layers (first blue sub-layer, second blue sub-layer, third blue sub-layer) with different decay characteristics. This segmentation allows each sub-layer to contribute differently to the overall blue emission, enabling color stability compensation without increasing the total area and thus maintaining display resolution.
2Stability of the object's composition
If the area of the blue organic light-emitting material layer is increased to maintain white balance, then color decay compensation is improved, but device complexity increases
Solution Approach 1:
The blue light-emitting layer is segmented into multiple sub-layers with different decay rates, allowing differential compensation of color decay while maintaining a relatively simple overall device structure without requiring additional complex components.
Solution Approach 2:
The patent introduces a dynamic control mechanism that adjusts the driving voltages applied to different blue sub-layers based on their decay characteristics. This dynamic voltage adjustment enables white balance maintenance without increasing structural complexity, as the control is achieved through electrical parameters rather than physical modifications.
3Stability of the object's composition
If multiple blue sub-layers with different decay rates are introduced, then color decay compensation is improved, but manufacturing complexity increases
Solution Approach 1:
The blue organic light-emitting material layer is segmented into multiple sub-layers that can be deposited sequentially using standard OLED manufacturing processes. Each sub-layer uses the same base material but with different thicknesses or compositions, allowing them to be manufactured using existing equipment and techniques without requiring entirely new manufacturing processes.
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 effectively prolongs the service life of OLED displays by compensating for color decay through sub-layer switching, maintaining display effectiveness and preventing color shifts, thus enhancing the display's overall performance and lifespan.
Implementation Method 1
An organic light-emitting diode (OLED) display has been widely used in a field of display technology. A basic structure of the OLED display includes an anode, a light-emitting functional layer and a cathode, wherein the light-emitting functional layer is made of an organic light-emitting material.
Data Source
AI summary
An array substrate and a manufacturing method thereof, and a display device are provided. The array substrate includes: a first electrode, a second electrode and a light-emitting functional layer located between the first electrode and the second electrode. The light-emitting functional layer at least includes an organic light-emitting material layer of a first color and an organic light-emitting material layer of a second color, a color decay rate of the organic light-emitting material layer of the first color being greater than a color decay rate of the organic light-emitting material layer of the second color. The organic light-emitting material layer of the first color at least includes a first sub-layer and a second sub-layer arranged in a stacking manner, and a third electrode is disposed between the first sub-layer and the second sub-layer.