OLED Insulating Member Prevents Electrode Short-Circuit
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Solution Overview
Problem
In OLED display devices, the second upper electrode layer can short-circuit with the lower electrode and cause abnormal light emission when in contact with the lateral surface of the organic compound layer, especially with highly conductive materials, leading to degradation and reduced display quality.
Innovation Solution
A display device design featuring insulating members, such as sidewalls or inter-element insulating layers, that cover the lateral surfaces of the organic layers, preventing the common electrode from contacting the organic layer and reducing the risk of short-circuits and abnormal emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second upper electrode layer is in contact with the lateral surface of the organic compound layer, then the common electrode can be formed continuously, but short-circuit between electrodes and abnormal light emission occur
Solution Approach 1:
An insulating member is introduced as an intermediary component between the organic compound layer and the second upper electrode layer. This insulating member prevents direct contact and short-circuit between the highly conductive organic compound layer and the electrode, while still allowing the common electrode to be formed continuously across multiple light emitting elements.
2Area of stationary object
If the second upper electrode layer contacts the lateral surface of the organic compound layer, then electrode coverage is maximized, but abnormal light emission occurs on the lateral surface
Solution Approach 1:
The insulating member serves as a mediator that blocks the path for abnormal light emission from the lateral surface of the organic compound layer. It prevents the second upper electrode layer from directly contacting the lateral surface, thereby eliminating the source of abnormal light emission while maintaining comprehensive electrode coverage through the top surface.
3Use of energy by moving object
If the organic compound layer uses highly conductive material, then current supply efficiency is improved, but short-circuit risk increases
Solution Approach 1:
The insulating member acts as a protective barrier that isolates the highly conductive organic compound layer from the second upper electrode layer. This allows the organic compound layer to maintain its high conductivity for efficient current supply while the insulating member prevents unintended short-circuits between the conductive organic material and the electrode.
Data Source
AI summary
Provided is a display device capable of preventing a common electrode from coming into contact with a lateral surface of an organic layer. The display device includes a plurality of light emitting elements, an insulating member, and a common electrode. The plurality of light emitting elements is two-dimensionally arranged. The light emitting elements each include a first electrode, an organic layer including a light emitting layer, and a second electrode in this order. The first electrode, the organic layer, and the second electrode are isolated for each of the light emitting elements. The common electrode is provided on the second electrodes of two or more of the light emitting elements. The insulating member covers the lateral surface of the organic layer of each of the light emitting elements.