OLED Anode Structure with Reflective Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED technologies face challenges in achieving high work function for anode materials, leading to increased power consumption and reduced lifetime, and the anode structures fail to completely shield light for thin film transistors, affecting display performance.
Innovation Solution
The OLED design incorporates a first electrode structure with a light reflecting layer and an insulating layer, where the first electrode and light reflecting layer overlap in a specific direction, with the insulating layer separating them, allowing for a high work function and low surface roughness, and the light reflecting layer shields the thin film transistor from light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anode structures are used, then the device can be manufactured, but the work function is insufficient leading to increased power consumption and reduced lifetime
Solution Approach 1:
The anode structure is segmented into multiple functional layers: a first electrode layer (transparent conductive oxide), a light reflecting layer (metal layer), and an insulating layer. This segmentation allows each layer to perform its specific function - the first electrode provides basic conductivity, the light reflecting layer enhances work function and shields light, and the insulating layer provides electrical isolation, collectively achieving high work function and low power consumption
Solution Approach 2:
The patent employs composite material structure combining transparent conductive oxide (ITO, IZO, or GZO) with metal layers (Al, Ag, or AlNd) and insulating materials. This composite approach creates an anode structure with superior properties: the metal layer raises the work function to 4.5eV or higher, the transparent conductive oxide maintains electrical conductivity, and the combination achieves both high reliability and low power consumption
2Device complexity
If the first electrode and light reflecting layer are directly contacted, then the structure is simple, but electrical short circuit occurs and device fails
Solution Approach 1:
An insulating layer is introduced as an intermediary between the first electrode layer and the light reflecting layer. This insulating layer prevents direct contact and electrical short circuit while allowing the two conductive layers to maintain their respective functions. The insulating layer acts as a mediator that enables the composite structure to work reliably without increasing excessive complexity
3Ease of manufacture
If the light reflecting layer is disposed without overlapping the first electrode, then the manufacturing process is simpler, but light shielding for thin film transistors is insufficient
Solution Approach 1:
The light reflecting layer is extended in the vertical dimension to overlap with the first electrode in the planar view. This dimensional extension ensures that the light reflecting layer completely blocks light from reaching the thin film transistor while maintaining manufacturing feasibility through standard layer deposition 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
This configuration reduces the turn-on voltage, increases the OLED's lifetime, improves preparation yield, and enhances light emitting uniformity and stability by maintaining a high work function and reducing surface roughness of the first electrode, while effectively shielding the thin film transistor.
Implementation Method 1
a light reflecting layer, the light reflecting layer is disposed on a side of the first electrode away from the light emitting structure
Implementation Method 2
an insulating layer is at least partially disposed between the at least portion of the light reflecting layer and the first electrode overlapped with each other
Implementation Method 3
holes injected from the anode and electrons injected from the cathode are combined in the light emitting layer and excited to generate light
Data Source
AI summary
An organic light emitting diode and a manufacturing method thereof, a display panel are provided. The organic light emitting diode includes a light emitting structure and a first electrode structure. The first electrode structure is configured to drive the light emitting structure to emit light and includes a first electrode and a light reflecting layer, the light reflecting layer is disposed on a side of the first electrode away from the light emitting structure, wherein the first electrode and at least a portion of the light reflecting layer are overlapped with each other in a first direction, an insulating layer is at least partially disposed between the at least part of the light reflecting layer and the first electrode overlapped with each other, and the first direction is perpendicular to a plane on which the light reflecting layer is located.