Display Electrode Segmentation for Moisture Suppression
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Solution Overview
Problem
The reliability of display devices using a specific electrode configuration is compromised due to moisture generation from oxidation-reduction reactions between the first metal layer and the transparent electrode, leading to organic layer deterioration and abnormal light emission.
Innovation Solution
A display device configuration where the first electrode includes a metal layer with a hydrogen absorption capacity and a transparent electrode covering its surface, with the peripheral edge of the first metal layer separated from the transparent electrode to prevent oxidation-reduction reactions, and optionally using sidewalls or gaps to further isolate the metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the transparent electrode covers the side surface of the metal layer to improve water蒸气 barrier performance, then the barrier effect is enhanced, but oxidation-reduction reactions occur at the contact interface generating moisture that deteriorates the organic layer
Solution Approach 1:
The metal layer is divided into a first metal layer and a second metal layer, with the first metal layer serving as a hydrogen absorption layer and the second metal layer as a reflective layer. This segmentation prevents direct contact between the transparent electrode and the hydrogen-absorbing first metal layer, eliminating the oxidation-reduction reaction interface while maintaining the water vapor barrier function through the second metal layer's coverage.
Solution Approach 2:
The second metal layer acts as an intermediary between the transparent electrode and the first metal layer. It allows the transparent electrode to cover the metal layer structure for water vapor barrier protection while preventing direct contact between the transparent electrode and the hydrogen-absorbing first metal layer, thus avoiding moisture generation from oxidation-reduction reactions.
2Quantity of substance
If the first metal layer is positioned close to the transparent electrode to maximize hydrogen absorption capacity, then hydrogen absorption is optimized, but direct contact causes oxidation-reduction reactions that generate moisture
Solution Approach 1:
The metal layer is segmented into two functional layers: the first metal layer positioned at the bottom for hydrogen absorption, and the second metal layer positioned above it for reflection. This segmentation physically separates the hydrogen absorption function from the interface with the transparent electrode, preventing moisture generation while maintaining hydrogen absorption capacity.
Solution Approach 2:
The solution moves the potential oxidation-reduction reaction interface to a different dimensional arrangement by stacking the metal layers vertically. The first metal layer absorbs hydrogen in the lower dimension, while the second metal layer interfaces with the transparent electrode in the upper dimension, separating the harmful reaction from the absorption function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration suppresses moisture generation and organic layer deterioration, enhancing the reliability and preventing abnormal light emission, thereby improving the overall performance of the display device.
Implementation Method 1
a first metal layer having a hydrogen absorption capacity
Data Source
AI summary
Provided is a display device capable of suppressing deterioration in reliability. A display device includes: a plurality of first electrodes; a second electrode facing the plurality of first electrodes; and an organic light-emitting layer provided between the plurality of first electrodes and the second electrode. Each of the first electrode includes: a metal layer having a main surface facing the organic light-emitting layer; and a transparent electrode covering a main surface of the metal layer and a side surface of the metal layer and containing a transparent conductive oxide. The metal layer includes: a first metal layer having a hydrogen absorption capacity; and a second metal layer provided on the first metal layer and facing the organic light-emitting layer with the transparent electrode interposed therebetween. A peripheral edge of the first metal layer is separated from the transparent electrode.