Display device and method of fabricating the same
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Solution Overview
Problem
High-resolution display devices face challenges with high pixel integration leading to narrowed spacing between light emitting elements, resulting in cathode electrode disconnection defects during the formation of multiple light emitting layers using photo lithography.
Innovation Solution
A display device design that includes a substrate with an anode electrode, a pixel defining layer, a first auxiliary electrode, a light emitting layer, a cathode electrode, a cathode capping layer, spacers, and a second auxiliary electrode, which reduces cathode electrode resistance and prevents disconnection by spacing apart the light emitting layers using photo lithography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photo lithography method is used to form multiple light emitting layers with high pixel integration, then manufacturing precision is improved, but cathode electrode disconnection defects occur due to narrowed spacing between light emitting elements
Solution Approach 1:
The patent introduces a first auxiliary electrode as an intermediary component between the light emitting layers and the cathode electrode. This auxiliary electrode serves as a mediator that maintains electrical connection stability while allowing the light emitting layers to be spaced apart, thus preventing cathode electrode disconnection defects during photo lithography processing
Solution Approach 2:
The patent creates a three-dimensional structure by positioning the first auxiliary electrode in a lower dimension beneath the light emitting layers. This vertical arrangement allows the light emitting layers to be separated in the horizontal plane while maintaining electrical connectivity through the auxiliary electrode in the vertical dimension
2Measurement precision
If spacing between light emitting elements is narrowed to achieve high-resolution display, then display quality is improved, but cathode electrode resistance increases and disconnection defects occur
Solution Approach 1:
The first auxiliary electrode acts as a conductive intermediary that bridges the gap between separated light emitting elements, maintaining low resistance electrical pathways even when the spacing between pixels is narrowed to achieve high display resolution
Solution Approach 2:
The patent merges the electrical conduction function with the structural spacing function by combining the first auxiliary electrode with the pixel defining layer structure, allowing multiple light emitting elements to be electrically connected while maintaining their spatial separation for high-resolution display
Data Source
AI summary
A display device includes: a substrate including a light emitting area and a non-light emitting area; an anode electrode on the light emitting area of the substrate; a pixel defining layer on the non-light emitting area of the substrate and defining a first opening; a first auxiliary electrode on the pixel defining layer; a light emitting layer on the anode electrode and spaced apart from the first auxiliary electrode; a cathode electrode on the light emitting layer and the first auxiliary electrode; a cathode capping layer on the cathode electrode; a spacer on the cathode capping layer and defining a second opening; and a second auxiliary electrode on the cathode capping layer and the spacer.