OLED Conductive Reflective Layer for Voltage Drop Reduction
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Solution Overview
Problem
Conventional organic light emitting diodes (OLEDs) face challenges in achieving high color quality and luminance due to structural limitations that result in low constructive interference effects, leading to undesirable degradation in driving voltage, efficiency, and lifetime when attempting to control color coordinates.
Innovation Solution
The OLED design incorporates a functional layer on the light-transmitting upper electrode for mutual reinforcement and interference of transmitted light, with a conductive reflective layer connected through ohmic contact to the upper electrode, reducing resistance and voltage drop, especially in large-area devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a reflective layer is formed on the first electrode to reflect light toward the second electrode, then luminous efficiency is improved, but device complexity increases due to additional layers and manufacturing steps
Solution Approach 1:
The patent combines the reflective layer and conductive layer into a single integrated structure. The reflective layer is formed directly on the first electrode, and the second electrode is formed directly on the reflective layer, merging multiple functions into fewer layers to reduce device complexity while maintaining luminous efficiency.
Solution Approach 2:
The reflective layer serves dual purposes: it reflects light toward the second electrode to improve luminous efficiency, and it also acts as a conductive layer to maintain electrical connectivity. This multi-functionality reduces the need for separate layers, thereby reducing device complexity.
2Illumination intensity
If the area of the OLED is increased to improve luminance, then light transmission area is enlarged, but voltage drop increases due to higher resistance in the electrode
Solution Approach 1:
The patent introduces a conductive layer specifically in the region where voltage drop is problematic (the second electrode region). This local enhancement of electrical conductivity addresses the voltage drop issue in large-area devices without requiring the entire device structure to be redesigned, thus maintaining luminance while reducing power loss.
Solution Approach 2:
The conductive layer acts as an intermediary between the reflective layer and the external circuit, providing a low-resistance path for current flow. This intermediary layer reduces the overall resistance of the electrode structure, thereby reducing voltage drop in large-area OLEDs while maintaining high luminance.
3Illumination intensity
If the thickness of the organic thin film layer is increased to improve light emission, then light transmission is enhanced, but manufacturing precision requirements increase to maintain uniformity
Solution Approach 1:
The patent divides the organic thin film layer into multiple sub-layers, each with specific functions (hole injection, hole transport, electron transport, etc.). This segmentation allows for better control of each layer's thickness and properties, reducing the overall manufacturing precision requirements while maintaining uniform light emission across the device.
Solution Approach 2:
The patent optimizes the thickness parameters of each organic sub-layer to achieve the desired light transmission while maintaining manufacturing feasibility. By carefully selecting and controlling the thickness of each layer within specific ranges, the patent achieves high light transmission without excessively stringent manufacturing precision requirements.
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 enhances color quality, luminance, and lifetime while reducing power consumption by minimizing voltage drop and maintaining uniform brightness across the OLED.
Implementation Method 1
a functional layer that enables mutual reinforcement and interference of transmitted light is formed on a portion of the upper electrode
Implementation Method 2
a conductive reflective layer connected through ohmic contact to the upper electrode, reducing resistance and voltage drop
Implementation Method 3
a reflective layer for reflecting light emitted from the emission material layer to travel toward the second electrode
Data Source
AI summary
Disclosed are an organic light emitting diode and a method of manufacturing the same, the organic light emitting diode including: a light-transmitting substrate including a first region and a second region separated from the first region; a first lower electrode formed on the first region of the light-transmitting substrate and a second lower electrode formed on the second region thereof; a first organic thin film layer including a first emission material layer, formed on the first lower electrode of the first region, and a second organic thin film layer including a second emission material layer, formed on the second lower electrode of the second region; and a light-transmitting upper electrode formed on the first organic thin film layer and the second organic thin film layer and configured such that portions corresponding to the first region and the second region are connected to each other.