Undercut Display Electrode Layout for Reflective Layer Isolation
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Solution Overview
Problem
Existing display devices face challenges in efficiently separating auxiliary connection electrodes and reflective layers, leading to potential issues with light output efficiency and color mixing.
Innovation Solution
A display device is designed with an undercut structure to electrically separate auxiliary connection electrodes and a reflective layer, which are formed in a single process from the same material layer, improving manufacturing efficiency and device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the auxiliary connection electrode and reflective layer are formed separately through multiple processes, then the manufacturing precision and electrical separation are improved, but the manufacturing complexity and production time increase
Solution Approach 1:
The auxiliary connection electrode and reflective layer are formed simultaneously in a single deposition process from the same material layer, merging two previously separate manufacturing steps into one. This reduces production time and manufacturing complexity while maintaining proper electrical separation through the undercut structure design
Solution Approach 2:
The planarization layer is designed with an undercut structure that creates vertical separation between the auxiliary connection electrode and reflective layer. By transitioning from a two-dimensional planar structure to a three-dimensional undercut structure, electrical separation is achieved without requiring separate formation processes
2Productivity
If the auxiliary connection electrode and reflective layer are formed in a single process from the same material layer, then the manufacturing efficiency is improved, but the electrical separation and manufacturing precision deteriorate
Solution Approach 1:
The planarization layer is segmented into different regions with different heights - a first planarization part and a second planarization part that extends downward to form an undercut. This segmentation creates physical separation between the auxiliary connection electrode and reflective layer while allowing both to be formed from the same material layer in a single process
Solution Approach 2:
The second planarization part acts as an intermediary structure that physically separates the auxiliary connection electrode and reflective layer. This intermediary undercut structure enables electrical isolation while maintaining the simplicity of single-process formation from the same material layer
3Illumination intensity
If the reflective layer is disconnected from the auxiliary connection electrode, then color mixing is prevented and light output efficiency is improved, but the device complexity increases
Solution Approach 1:
Instead of using complex lateral separation structures, the patent uses vertical dimensionality through the undercut structure to disconnect the reflective layer from the auxiliary connection electrode. This simple vertical separation prevents color mixing and improves light output efficiency without adding device complexity
Solution Approach 2:
The second planarization part is extracted or removed in specific regions to create the undercut structure, physically disconnecting the reflective layer from the auxiliary connection electrode. This extraction creates the necessary electrical isolation for improved light output efficiency while maintaining a relatively simple overall device structure
Data Source
AI summary
A display device and a method of manufacturing a display device are disclosed. A display device includes a planarization layer including a first planarization part on a substrate, and a second planarization part and a third planarization part on the first planarization part, a first pad electrode on the second planarization part, and a second pad electrode on the third planarization part, an organic pattern layer on the first pad electrode and the second pad electrode, a light emitting element on the organic pattern layer, a partition wall, a reflective layer on a side of the partition wall and the first planarization part, a first auxiliary connection electrode connecting the second semiconductor layer and the first pad electrode, and a second auxiliary connection electrode connecting the first semiconductor layer and the second pad electrode, and the planarization layer has an undercut shape.