Light Emitting Display Device Connection Electrode Potential Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Light emitting display devices with common layers of high mobility suffer from lateral leakage current, leading to unintended operation of adjacent sub-pixels and light leakage, due to the lack of effective potential stabilization and moisture/air barrier in the edge areas.
Innovation Solution
Incorporating a connection electrode connected to the common layer to stabilize its potential and prevent lateral leakage current, while using metal components in the common layer to prevent air and moisture permeation in the edge areas, the display device includes a substrate with sub-pixels, first and second electrodes, an interlayer with stacks, and charge generation layers, with connection electrodes positioned in non-display areas to manage the potential and prevent external intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If common layers with high mobility are used to increase light emission efficiency, then light emission efficiency is improved, but lateral leakage current is generated causing adjacent sub-pixels to operate incorrectly
Solution Approach 1:
The common layer is segmented into multiple regions with different potentials by introducing connection electrodes at specific positions. This segmentation allows the high mobility material to maintain its light emission efficiency while the segmented potential distribution prevents lateral leakage current from affecting adjacent sub-pixels.
Solution Approach 2:
Connection electrodes are introduced as intermediary elements between the common layer and the electrode structure. These connection electrodes act as mediators to stabilize the potential of the common layer, preventing charge accumulation and lateral leakage current while maintaining the high mobility characteristics of the common layer material.
2Reliability
If connection electrodes are added to stabilize common layer potential, then lateral leakage current is prevented, but device complexity increases
Solution Approach 1:
The connection electrodes are merged with the existing electrode structure of the display device. Rather than adding completely separate components, the connection electrodes are integrated into the existing electrode layers, stabilizing the common layer potential while minimizing the increase in device complexity.
Solution Approach 2:
The connection electrodes serve multiple functions: they stabilize the potential of the common layer, prevent lateral leakage current, and are integrated into the existing electrode structure. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Stability of the object's composition
If metal components are used in common layer to prevent moisture and air permeation, then material stability is improved, but manufacturing complexity increases
Solution Approach 1:
The common layer is constructed as a composite material structure, combining organic emissive materials with metal components. The metal components are incorporated into the common layer to provide moisture and air barrier properties, enhancing material stability. This composite approach allows the integration of protective metal elements within the existing manufacturing process for organic light emitting layers.
Data Source
AI summary
A light emitting display device includes a substrate including a display area including a plurality of sub-pixels and a non-display area surrounding the display area, a plurality of first electrodes provided in the plurality of sub-pixels, a second electrode facing the plurality of first electrodes and extending over the entire display area and a part of the non-display area, an interlayer including a plurality of stacks provided between the plurality of first electrodes and the second electrode and a charge generation layer between the plurality of stacks, a first connection electrode provided in the non-display area and connected to the second electrode, and a second connection electrode disposed closer to the display area than the first connection electrode and connected to the charge generation layer, thus stabilizing the potential of a common layer having high mobility by using a connection electrode to prevent lateral leakage current caused by the common layer.