OLED Panel Auxiliary Light-Emitting Layer Reduces Lateral Leakage
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Solution Overview
Problem
Existing OLED display panels face issues with lateral leakage and imbalanced hole and electron transport, leading to reduced luminous efficiency and increased power consumption.
Innovation Solution
Incorporating a first auxiliary light-emitting layer with a radialene compound doped into a host material, which enhances hole injection capability and balances carrier injection and transport, thereby reducing operation voltage and lateral leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional OLED structure is used, then device simplicity is maintained, but lateral leakage occurs and luminous efficiency decreases
Solution Approach 1:
The patent divides the light-emitting layer into two distinct segments: a first light-emitting layer and a second light-emitting layer. This segmentation allows each layer to perform specific functions - the first layer primarily emits light while the second layer transports electrons, thereby reducing lateral leakage and improving luminous efficiency without creating a monolithic complex structure.
Solution Approach 2:
The patent introduces a vertical dimension to the light-emitting structure by stacking multiple light-emitting layers with different orientations and functions. The first light-emitting layer is disposed in a first direction while the second light-emitting layer is disposed in a second direction different from the first, creating a multi-dimensional charge transport pathway that reduces lateral leakage.
2Loss of energy
If conventional single light-emitting layer is used, then device complexity is low, but hole and electron transport balance is poor
Solution Approach 1:
The patent segments the charge transport function by creating separate first and second light-emitting layers with different orientations. This segmentation enables independent optimization of hole and electron transport pathways, achieving better transport balance and reducing power consumption through more efficient charge recombination.
Solution Approach 2:
The patent employs composite light-emitting layer structures where multiple layers with different material compositions and orientations work together. The first and second light-emitting layers are formed with different materials optimized for their respective functions, creating a composite structure that achieves superior charge transport balance.
3Object-affected harmful factors
If conventional OLED structure is used, then manufacturing process is simple, but lateral leakage causes adjacent pixels to emit light
Solution Approach 1:
The patent segments the light-emitting function across multiple oriented layers, which confines charge recombination and light emission to specific pixel regions. The first and second light-emitting layers with different orientations create a more controlled charge transport pathway that prevents lateral leakage to adjacent pixels while maintaining manufacturability.
Solution Approach 2:
The patent applies local quality by giving different orientations and material compositions to different light-emitting layers. The first light-emitting layer is optimized for one function while the second light-emitting layer is optimized for another, with each layer having specific local properties that collectively solve the lateral leakage problem.
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 improves luminous efficiency, reduces power consumption, and suppresses lateral leakage by efficiently injecting and transporting holes and electrons in the OLED panel.
Implementation Method 1
The first auxiliary light-emitting layer comprises a host material and a dopant material, and the dopant material comprises a compound of the following chemical formula (I)
Implementation Method 2
enhances hole injection capability and balances carrier injection and transport
Implementation Method 3
organic light-emitting diodes (OLEDs) are emerging as a new generation of display elements and have attracted a lot of attention, because of their various advantages such as self-luminous
Data Source
AI summary
An OLED display panel is provided. The OLED display panel comprises a first electrode; an opposite second electrode; and a plurality of stacking layers sandwiched between the first electrode and the second electrode. The plurality of stacking layers at least comprises a first auxiliary light-emitting layer and a light-emitting layer sequentially disposed on the first electrode. The first auxiliary light-emitting layer comprises a host material and a dopant material, and the dopant material comprises a compound of the following chemical formula (I):where n is an integer equal to or larger than 1, X1, X2 and Xn+2 each independently has a chemical structure ofR′ is selected from any one of a substituted aryl group and a substituted heteroaryl group, and a substituent in the substituted aryl group and a substituent in the substituted heteroaryl group each includes at least one electron acceptor group.