Auxiliary Electrode Design for Display Devices to Prevent Voids
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display devices, the formation of voids in under-cut regions due to insufficient filler flow affects image quality and reduces the contact area between the upper electrode and the auxiliary electrode, leading to unreliable electrical connections.
Innovation Solution
The implementation of a display device structure with a base insulating layer having penetrating holes, where the auxiliary electrode extends onto the sides of these holes, and additional insulating layers with protrusions and penetrating holes are used to increase the contact area and ensure proper filler flow, preventing void formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the vertical thickness of insulating layers on the auxiliary electrode is reduced, then the under-cut region size is reduced and void formation is prevented, but the contact area between the upper electrode and auxiliary electrode is reduced
Solution Approach 1:
The auxiliary electrode is designed to extend not only horizontally but also vertically by protruding from the side surface of the insulating layer. This three-dimensional configuration allows the electrode to maintain adequate contact area with the upper electrode while reducing the horizontal under-cut region size, thereby preventing void formation during filler injection.
Solution Approach 2:
The auxiliary electrode is positioned within the penetrating hole of the insulating layer and extends onto its side surface, creating a nested configuration. This allows the electrode to utilize the vertical space within and around the insulating layer structure, maximizing contact area while minimizing the external under-cut region.
2Manufacturing precision
If the under-cut region size is reduced to prevent voids, then void formation is prevented, but the contact area between upper electrode and auxiliary electrode is reduced
Solution Approach 1:
By extending the auxiliary electrode vertically onto the side surface of the insulating layer, the design compensates for the reduced horizontal under-cut region. This vertical extension ensures adequate electrical contact area is maintained even when the overall under-cut region is minimized for better filler filling.
Solution Approach 2:
The auxiliary electrode is strategically positioned to extend specifically onto the side surface of the insulating layer where contact with the upper electrode is needed. This localized extension ensures electrical connection reliability is maintained in the critical contact region while the overall under-cut region remains small.
Data Source
AI summary
A display device includes an auxiliary electrode in order to prevent uneven brightness by the voltage drop. The display device further includes an under-cut region formed by stacked insulating layers. In the display device, the under-cut region is completely filled by filler due to changing a shape of the auxiliary electrode, so that the quality of the displaying image is improved. Also, in the display device, the contact area between an upper electrode of a light-emitting structure and the auxiliary electrode is increased, so that the reliability and the degree of integration are improved.