OLED Light-Emitting Base Plate Layout for Lower IR Drop
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Solution Overview
Problem
Large-sized OLED devices experience significant IR drop in the cathode due to high impedance, affecting display uniformity.
Innovation Solution
A light-emitting base plate design with a first electrode wiring connected directly to an electrode signal bus via an electrode signal leading wire, utilizing transparent metal oxide materials for the first electrode layer and larger via holes to reduce impedance and improve signal uniformity, along with layered data and electrode signal leading wires to minimize interference and reduce frame area occupation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional cathode structure is used in large-sized OLED devices, then device simplicity is maintained, but IR drop increases significantly due to high impedance, affecting display uniformity
Solution Approach 1:
The cathode is divided into multiple segments: a first transparent metal oxide electrode layer covering the entire display area, and a second metal electrode layer positioned at the frame area. This segmentation allows the low-impedance metal electrode to compensate for IR drop in the transparent electrode, improving display uniformity while maintaining overall device simplicity.
Solution Approach 2:
The metal electrode layer acts as an intermediary element between the transparent metal oxide electrode and the anode. It provides a low-impedance path that mediates the current flow, reducing IR drop in the high-impedance transparent electrode and thereby improving display uniformity.
2Ease of manufacture
If data signal leading wire and electrode signal leading wire are placed at the same layer, then routing is simplified, but signal interference increases between the two wires
Solution Approach 1:
The data signal leading wire and electrode signal leading wire are positioned in different layers (third wiring layer and second wiring layer respectively). This dimensional separation in the vertical direction eliminates signal interference while maintaining routing simplicity through the layered structure.
3Loss of energy
If via holes are made larger to reduce impedance, then IR drop decreases, but manufacturing precision requirements increase
Solution Approach 1:
The via holes connecting the metal electrode layer to the transparent metal oxide electrode are designed with optimized dimensions and positioning. By carefully controlling the via hole parameters (size, position, depth), the design achieves low impedance connections that reduce IR drop while remaining compatible with standard manufacturing precision capabilities.
Data Source
AI summary
Light-emitting base plate and method for preparing the same and a light-emitting device is provided, relating to the field of display technology. The light-emitting base plate includes a substrate, a functional layer disposed at one side of the substrate, and a first insulating layer and a first electrode layer stacked at one side of the functional layer away from the substrate, the first insulating layer is located between the functional layer and the first electrode layer; wherein the functional layer includes: a first electrode wiring located at the display area, an electrode signal bus located at the frame area, and an electrode signal leading wire connecting the first electrode wiring and the electrode signal bus; the first electrode layer is connected to the first electrode wiring by a first via hole provided at the first insulating layer.