OLED Bus Electrode Contact via Laser Ablation
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Solution Overview
Problem
Organic light emitting display apparatuses face issues with IR drop and unintended brightness differences due to the absence of a bus electrode, leading to manufacturing challenges and reduced luminous stability.
Innovation Solution
The apparatus includes a bus electrode with an insulating layer and a pixel electrode, where a first and second intermediate layer are formed with openings to expose the bus electrode, allowing the opposite electrode to contact the bus electrode directly, thereby minimizing IR drop and brightness differences. This is achieved through a manufacturing method involving laser beam irradiation to create openings in the intermediate layers, ensuring high electrical conductivity and uniform brightness across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the opposite electrode is formed integral to all pixels without a bus electrode, then the device structure is simple, but IR drop occurs and brightness uniformity deteriorates
Solution Approach 1:
The opposite electrode is segmented into two functional parts: a common opposite electrode layer covering all pixels, and separate bus electrode contacts that provide localized electrical connection points. This segmentation allows the system to maintain structural simplicity while establishing multiple low-impedance connection paths to prevent IR drop and ensure uniform brightness across pixels.
2Reliability
If a bus electrode is added to prevent IR drop, then brightness uniformity improves, but device complexity increases
Solution Approach 1:
The bus electrode functionality is merged with the common opposite electrode by forming the bus electrode contacts as protrusions from the same conductive material layer. This merging eliminates the need for separate bus electrode structures, reducing device complexity while maintaining the ability to prevent IR drop and ensure brightness uniformity.
3Reliability
If the opposite electrode contacts the bus electrode through openings in intermediate layers, then electrical conductivity improves, but manufacturing precision requirements increase
Solution Approach 1:
The bus electrode contacts are designed as protrusions that extend through the intermediate layers to make direct contact with the common opposite electrode, creating equipotential regions that ensure reliable electrical connection. This design reduces the precision requirements for opening alignment by providing tolerance for positional variations while maintaining effective electrical conductivity.
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 enhances manufacturing efficiency and achieves high luminous stability by preventing IR drop and brightness differences, ensuring consistent performance across the display apparatus.
Implementation Method 1
a method of manufacturing an organic light emitting display apparatus includes irradiating a laser beam onto at least a part of the opposite electrode corresponding to the bus electrode so that at least a part of layers between the opposite electrode and the bus electrode is removed
Data Source
AI summary
An organic light emitting display apparatus and a method of manufacturing the same are disclosed. The organic light emitting display apparatus includes, for example, a bus electrode, an insulating layer covering the bus electrode and having a bus electrode hole exposing at least a part of the bus electrode, a pixel electrode formed on the insulating layer and electrically coupled with the bus electrode, a pixel defining layer exposing a part of the pixel electrode and a part of the bus electrode, a first intermediate layer on the pixel defining layer and the pixel electrode, the first intermediate layer having a first opening to expose the part of the bus electrode, an emission layer disposed on the first intermediate layer, and an opposite electrode to correspond to the pixel electrode and the bus electrode and contacting the bus electrode through the first opening and the bus electrode hole.