Display Substrate Cathode Connection for Reduced Voltage Drop
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Solution Overview
Problem
The challenge of effectively connecting a main cathode to an auxiliary cathode in display devices with top-emitting products, particularly in large-sized displays, to alleviate voltage drop issues and improve display uniformity.
Innovation Solution
A display substrate design with a connection structure that includes a conductive layer and a top structure, where the orthographic projection of the second conductive layer is inside the orthographic projection of the top structure, and the first electrode layer is electrically connected to the connection structure, allowing for adequate electrical connection and reducing voltage drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cathode is made very thin to improve transparency effect in large-sized top-emitting displays, then the transparency is improved, but voltage drop (IR drop) problem occurs in the cathode
Solution Approach 1:
The patent introduces a connection structure as an intermediary component between the main cathode and auxiliary cathode. This connection structure includes a first conductive layer, second conductive layer, and top structure that provides a dedicated electrical pathway, mediating the electrical connection while maintaining the thin cathode design for transparency.
Solution Approach 2:
The connection structure extends in multiple dimensions - the first conductive layer is on the base substrate, the second conductive layer is above it, and the top structure extends further upward. This multi-dimensional arrangement creates an effective electrical connection path without requiring a thick cathode, thus maintaining transparency while reducing voltage drop.
2Reliability
If a connection structure is introduced to connect main cathode to auxiliary cathode, then voltage drop is alleviated, but device complexity increases
Solution Approach 1:
The connection structure is merged with the existing cathode system architecture. The first conductive layer connects to the main cathode, the second conductive layer connects to the auxiliary cathode, and the top structure bridges them, combining multiple functions into an integrated structure that reduces voltage drop without requiring entirely separate components.
Solution Approach 2:
The connection structure serves multiple functions: it provides electrical connection between cathodes, maintains structural integrity, and supports the overall device architecture. The top structure can also serve as a platform for additional functional layers, making the design versatile and reducing the need for separate dedicated components.
Data Source
AI summary
The present disclosure provides a display substrate, a manufacturing method thereof and a display device. The display substrate includes: a substrate structure including a base substrate; and a light-emitting structure, a pixel defining layer and a connection structure, wherein the light-emitting structure includes a conductive structure layer, a first light-emitting layer and a first electrode layer. The connection structure includes a first conductive layer, a second conductive layer and a top structure, wherein an orthographic projection of the second conductive layer on the base substrate is inside an orthographic projection of the top structure on the base substrate, and the top structure includes a second light-emitting layer, wherein an orthographic projection of the first light-emitting layer on the base substrate partially overlaps with an orthographic projection of the second light-emitting layer on the base substrate.