Organic EL Display Insulating Pattern Laser Repair
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Solution Overview
Problem
During the fabrication of organic electroluminescent display devices, extraneous matters like fine dust can cause electric shorts between the anode and cathode, leading to malfunctioning pixels.
Innovation Solution
A method involving the formation of an insulating pattern within the organic layer using a laser to remove extraneous matter, with the pattern extending through the lower conductive layer and covered by an upper conductive layer, ensuring the insulating pattern's height is less than or equal to the total thickness of the organic and lower conductive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic layer is fabricated without additional protective structures, then the manufacturing process is simple, but extraneous matter causes electric shorts between electrodes
Solution Approach 1:
The second electrode is divided into two separate conductive layers (lower and upper) with an insulating pattern inserted between them. This segmentation allows the insulating pattern to be positioned within the electrode structure to prevent electric shorts caused by extraneous matter in the organic layer, while maintaining overall electrode functionality.
Solution Approach 2:
An insulating pattern is introduced as an intermediary element between the lower and upper conductive layers. This insulating pattern extends into the organic layer to physically isolate conductive paths, preventing electric shorts without requiring complete restructuring of the electrode system.
2Reliability
If the insulating pattern extends deeply into the organic layer, then electric short prevention is improved, but the organic layer structure is compromised
Solution Approach 1:
The insulating pattern is positioned locally within the organic layer at specific locations where extraneous matter may exist, rather than extending uniformly throughout. The height of the insulating pattern is controlled to be less than or equal to the total thickness of the organic layer and lower conductive layer, providing localized protection while preserving overall organic layer integrity.
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 approach effectively removes extraneous matter, preventing electric shorts and enabling the repair of malfunctioning pixels, thereby improving the yield of functional organic electroluminescent display devices.
Implementation Method 1
illuminating a laser onto the organic layer through an upper surface of the lower conductive layer to remove an extraneous matter from the organic layer and form a hole penetrating the lower conductive layer
Data Source
AI summary
An organic electroluminescent display device includes a first electrode on a substrate, an organic layer including a light-emitting layer on the first electrode, a second electrode including lower and upper conductive layers sequentially stacked on the organic layer, and an insulating pattern extending into the organic layer through the lower conductive layer.