OLED Cathode Connection via Bank Gap
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Solution Overview
Problem
The existing top emission type organic light emitting display devices require an additional partition for electrical connection between the cathode and auxiliary electrodes, leading to a lower yield due to the additional mask process needed for partition formation.
Innovation Solution
A top emission type organic light emitting display device is designed without an additional partition, where the cathode electrode is connected to the auxiliary electrode via a gap space between the first and second banks, with the first bank having a larger upper surface width than its lower surface width, and the second bank being thinner, allowing electrical connection without the need for an additional mask process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional partition is provided for electrical connection between the cathode electrode and auxiliary electrode, then the electrical connection is ensured, but the manufacturing complexity increases due to the additional mask process
Solution Approach 1:
The invention extracts and eliminates the unnecessary partition structure from the device. By removing the partition that caused the additional mask process, the invention achieves electrical connection between the cathode electrode and auxiliary electrode through the organic emitting layer itself, thereby reducing manufacturing complexity while maintaining reliability
Solution Approach 2:
The organic emitting layer is given a dual function: it serves both as the light-emitting functional layer and as the electrical connection path between the cathode electrode and auxiliary electrode. This multi-functionality eliminates the need for the separate partition structure and its associated mask process
2Reliability
If an additional partition is provided for electrical connection, then the electrical connection is ensured, but the manufacturing yield decreases due to the additional mask process
Solution Approach 1:
The invention removes the partition structure that necessitated the additional mask process. By extracting this unnecessary component, the manufacturing process is simplified, leading to improved yield while the electrical connection function is maintained through the organic emitting layer's inherent conductivity
Solution Approach 2:
The invention merges the electrical connection function into the existing organic emitting layer deposition process. By combining the light-emitting function and electrical connection function into a single layer deposition step, the manufacturing process is streamlined, reducing the number of process steps and improving overall yield
Data Source
Figure 1~2
Figure 3A~3B
Figure 3C~3D
AI summary
Disclosed is an organic light emitting display device that may include anode (180,200) and cathode (250) electrodes on a substrate (100), an organic emitting layer (240) provided between the anode electrode (200) and the cathode electrode (250), an auxiliary electrode (190,210) connected with the cathode electrode (250), a first bank (221) on the auxiliary electrode (210), and a second bank (222) between the auxiliary electrode (210) and the anode electrode (200), wherein the first (221) and second (222) banks are spaced from each other, wherein a width in an upper surface of the first bank (221) is larger than a width in a lower surface of the first bank (221), and the cathode electrode (250) is connected with the auxiliary electrode (210) via a gap space between the first bank (221) and the second bank (222).