OLED Upper Electrode Feed Structure for Uniform Voltage Supply
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Solution Overview
Problem
The configuration for supplying voltage to the upper electrode in OLED display devices is susceptible to improvements, particularly in terms of efficiency and uniformity.
Innovation Solution
A display device configuration featuring a substrate with a circuit layer, a metal-made feed line, a lower electrode, a rib, a partition, and a conductive layer, where the lower portion of the conductive layer is in contact with the feed line, allowing for improved voltage supply to the upper electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If voltage is supplied to the upper electrode through conventional configurations, then the display device can operate, but the voltage supply efficiency and uniformity are insufficient
Solution Approach 1:
The upper electrode is divided into multiple segments (first upper electrode and second upper electrode) that are electrically disconnected from each other. Each segment is supplied with voltage through separate conductive layers and contact holes, allowing independent voltage control and improved uniformity across different regions of the display device.
Solution Approach 2:
Conductive layers are introduced as intermediary structures between the pixel circuits and the upper electrodes. These conductive layers include conductive holes that extend through multiple insulating layers, providing efficient electrical pathways that improve both voltage supply efficiency and uniformity.
2Device complexity
If the upper electrode is supplied with common voltage, then the structure is simple, but the voltage distribution uniformity deteriorates
Solution Approach 1:
The upper electrode is segmented into multiple electrically isolated regions, each with its own voltage supply path. This segmentation allows different regions to receive voltage independently, ensuring uniform voltage distribution even when using a relatively simple common voltage supply structure.
Solution Approach 2:
The voltage supply structure is extended into the third dimension by forming conductive holes that penetrate multiple insulating layers vertically. This vertical extension creates efficient electrical pathways without significantly increasing planar complexity, thereby maintaining structural simplicity while improving voltage distribution uniformity.
Data Source
AI summary
According to one embodiment, a display device includes a substrate, a circuit layer including a metal-made feed line in a surrounding area, an insulating layer covering the circuit layer, a lower electrode, a rib, a partition above the rib, an upper electrode connected to the partition, an organic layer between the electrodes and a conductive layer connected to the partition. The partition and the conductive layer each includes a metal-made lower portion and an upper portion protruding from a side surface of the lower portion. The lower portion of the conductive layer and the feed line are in contact with each other in the first contact portion in the surrounding area.