Display Electrode Opening Layout for Reliable Contact Connection
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Solution Overview
Problem
Existing display devices face challenges in maintaining electrical connectivity between electrodes and light-emitting elements, leading to potential disconnection and reduced electrical reliability.
Innovation Solution
The proposed display device incorporates a specific structure involving a first electrode, a first insulating film with a distributed Bragg reflector (DBR) structure, and a contact electrode that electrically contacts the first electrode through carefully designed openings in the insulating films, ensuring that the contact electrode is not in direct contact with the first insulating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact electrode directly contacts the first insulating film, then the structure is simpler, but the electrical reliability deteriorates due to potential disconnection
Solution Approach 1:
The patent introduces a second insulating film as an intermediary layer between the contact electrode and the first insulating film. This second insulating film has a second opening that is smaller than the first opening, creating an overlapping structure where the side surface of the first insulating film is covered by the second insulating film. This intermediary layer prevents direct contact between the contact electrode and the first insulating film, eliminating disconnection risks while maintaining structural integrity.
Solution Approach 2:
The patent solves the reliability issue by transitioning from a single-plane contact structure to a multi-dimensional overlapping structure. The second insulating film extends laterally to cover the side surface of the first insulating film, creating a three-dimensional configuration where openings at different levels are offset. This dimensional change ensures continuous electrical connection through the stacked insulating films while preventing electrode disconnection.
2Ease of operation
If the first opening has a large diameter for easy electrode contact, then ease of operation improves, but the risk of electrode disconnection increases
Solution Approach 1:
The patent divides the contact structure into multiple segmented openings: a first opening in the first insulating film with a larger diameter for easy electrode contact, and a second opening in the second insulating film with a smaller diameter for stable connection. This segmentation allows each opening to fulfill different functional requirements - the larger first opening facilitates electrode placement while the smaller second opening ensures reliable electrical connection.
Solution Approach 2:
The patent applies different opening diameters at different locations/levels of the insulating film stack. The first opening has a larger diameter (8-10 μm) to facilitate easy electrode contact and alignment, while the second opening has a smaller diameter (4-6 μm) to provide stable electrical connection. This local quality variation optimizes both ease of operation and connection reliability at different stages of the contact structure.
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 effectively prevents disconnection of the contact electrode and enhances electrical reliability by ensuring a stable electrical connection through the use of overlapping insulating films and carefully sized openings.
Implementation Method 1
The first insulating film may include a first refractive layer having a first refractive index, and a second refractive layer disposed on the first refractive layer and having a second refractive index greater than the first refractive index. The first insulating film may be a distributed Bragg reflector.
Implementation Method 2
a first refractive layer having a first refractive index, and a second refractive layer disposed on the first refractive layer and having a second refractive index greater than the first refractive index
Data Source
AI summary
A display device includes a first electrode disposed on a substrate, a first insulating film disposed on the first electrode and having a first opening formed, a second insulating film disposed on the first insulating film and having a second opening, and a contact electrode electrically contacting at least a portion of the first electrode through the first opening and the second opening, wherein a side surface of the first insulating film defines the first opening, and the second insulating film overlaps the side surface of the first insulating film such that the contact electrode and the first insulating film are not in contact with each other.