Sub-Pixel Trench Electrode Layout for Leakage-Resistant Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving improved reliability and efficiency in sub-pixel separation and electrical connectivity, particularly in high-integration displays such as OLED on Silicon (OLEDoS) devices.
Innovation Solution
The display device incorporates a trench between sub-pixels with an electrode layer that protrudes beyond the first electrode, featuring a concave portion with a protective layer and multiple conductive layers, enhancing separation and electrical connectivity through a method that includes forming an insulating pattern, polishing, and creating a trench to expose the first electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trench is formed between sub-pixels to improve separation and reduce current leakage, then reliability is improved, but device complexity increases due to additional manufacturing steps
Solution Approach 1:
An insulating pattern is formed in the boundary area between sub-pixels before forming the first electrode. This preliminary insulating layer simplifies subsequent trench formation because the trench can be etched through the insulating pattern rather than requiring complex isolation structures to be built after electrode formation, thus improving reliability while managing manufacturing complexity
Solution Approach 2:
The boundary area between sub-pixels is segmented into distinct functional zones: the insulating pattern provides electrical isolation, the trench provides physical separation, and the electrode layer provides electrical connectivity. This segmentation allows each component to be optimized independently, improving overall reliability without requiring all isolation functions to be achieved by a single complex structure
2Reliability
If the electrode layer width is increased to improve electrical connectivity, then electrical conductivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The electrode layer is designed to extend beyond the first electrode in the planar dimension, creating an overlapping configuration. This dimensional extension provides redundant electrical pathways and improves connectivity reliability without requiring increased thickness or complex three-dimensional structures that would demand higher manufacturing precision
Solution Approach 2:
The insulating pattern serves as an intermediary structure that allows the electrode layer to extend into the boundary area while maintaining proper electrical isolation. This mediator enables the electrode layer to achieve improved connectivity through extended width without compromising manufacturing precision, as the insulating pattern provides a clear boundary guide for the electrode layer formation
Data Source
AI summary
A display device includes: a first sub-pixel and a second sub-pixel, wherein each of the first sub-pixel and the second sub-pixel includes: a first electrode including a concave portion; a protective layer in the concave portion of the first electrode; an electrode layer on the first electrode and the protective layer; a light emitting structure on the electrode layer; and a second electrode on the light emitting structure, wherein the display device comprises a trench between the first electrode of the first sub-pixel and the first electrode of the second sub-pixel, and wherein a width of the electrode layer in a first direction is greater than a width of the first electrode in the first direction.