Display Substrate Cathode Connection Layout for Lower IR Drop
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Solution Overview
Problem
Transparent display products face challenges in reducing IR drop due to the thin cathode, leading to defects like local dark points and adverse display effects, especially when the auxiliary connection structure is damaged during the manufacturing process.
Innovation Solution
A display substrate design that includes a base substrate with a driving circuit layer, a light-emitting unit, and an auxiliary connection structure made of the same material as the first electrode structure, where a protection hole is formed in the planarization layer to protect the auxiliary connection structure, preventing damage during washing and ensuring electrical coupling between the auxiliary electrode and the second electrode, thereby reducing IR drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cathode is made with very small thickness to improve transparency, then the transparency effect is improved, but the IR drop increases
Solution Approach 1:
The cathode is divided into a main cathode and an auxiliary cathode that are electrically connected. The auxiliary cathode is positioned to overlap with the main cathode in the vertical direction, creating multiple current paths that reduce the overall electrical resistance while maintaining the thin thickness of the cathode layers for transparency.
Solution Approach 2:
A transparent conductive oxide layer is introduced as an intermediary between the auxiliary cathode and the main cathode. This intermediate layer facilitates electrical connection while maintaining optical transparency, allowing the auxiliary cathode to reduce IR drop without compromising the transparency of the display device.
2Ease of manufacture
If the auxiliary connection structure is exposed during washing, then the manufacturing process is simplified, but the auxiliary connection structure is damaged
Solution Approach 1:
A protection layer is formed over the auxiliary connection structure before the washing process. This preliminary protective action shields the vulnerable auxiliary connection structure from damage during washing, and the protection layer is subsequently removed after the washing is completed, ensuring both ease of manufacture and structural integrity.
Solution Approach 2:
The protection layer serves as a cushioning barrier that absorbs or distributes mechanical stresses during the washing process before they can reach the auxiliary connection structure. This beforehand cushioning prevents damage to the delicate auxiliary connection structure while allowing the washing process to proceed effectively.
Data Source
AI summary
The present disclosure provides a display substrate, a manufacturing method and a display device. The display substrate includes a base substrate, a driving circuit layer and a light-emitting unit. The driving circuit layer includes a source/drain metal layer, the source/drain metal layer includes a source electrode, a drain electrode and an auxiliary electrode, the light-emitting unit includes a first electrode structure, a light-emitting layer and a second electrode structure, the display substrate further includes an auxiliary connection structure and a protection hole, an orthogonal projection of the auxiliary connection structure onto the base substrate is located within an orthogonal projection of the protection hole onto the base substrate, and a distance between a surface of the auxiliary connection structure away from the base substrate and the base substrate is less than a distance between a surface of the planarization layer away from the base substrate and the base substrate.