Emission Defining Layer Structure for Sidewall-Safe Display Pixels
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Solution Overview
Problem
Existing display devices face challenges in partitioning the emission area of light emitting elements without damaging their sidewalls, which can lead to defects and reduced light efficiency.
Innovation Solution
A display device is designed with a plurality of pixel electrodes and light emitting elements, where an emission defining layer surrounds the side surfaces of the light emitting elements, partitioning their emission areas without the need for etching or exposing the sidewalls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sidewall etching is performed to partition emission areas, then emission area partitioning is achieved, but light emitting element sidewalls are damaged
Solution Approach 1:
The emission defining layer is divided into multiple segments: a bottom layer that contacts the substrate and light emitting element sidewalls, and a top layer that defines the emission area opening. This segmentation allows the bottom layer to protect sidewalls while the top layer achieves precise emission area partitioning, resolving the contradiction between partitioning precision and sidewall integrity.
Solution Approach 2:
The bottom layer of the emission defining layer is formed in advance to contact and protect the light emitting element sidewalls before the emission area partitioning is completed by the top layer. This preliminary action prevents sidewall damage during subsequent processing steps, maintaining sidewall integrity while enabling precise emission area definition.
2Manufacturing precision
If sidewall etching is performed to partition emission areas, then emission area partitioning is achieved, but defects are generated in light emitting elements
Solution Approach 1:
The emission defining layer acts as an intermediary structure between the substrate and the emission area opening. It provides a protective barrier that prevents direct contact between etching processes and light emitting elements, thereby achieving emission area partitioning without generating defects in the light emitting elements.
Solution Approach 2:
The emission defining layer is formed beforehand to establish a protective structure before emission area partitioning is performed. This preliminary formation prevents defects by ensuring that no etching or damaging processes directly contact the light emitting element sidewalls during subsequent manufacturing steps.
3Manufacturing precision
If sidewall etching is performed to partition emission areas, then emission area partitioning is achieved, but the fabrication process becomes more complex
Solution Approach 1:
The emission defining layer combines multiple functions into a single integrated structure: it provides emission area definition, sidewall protection, and process isolation. This merging eliminates the need for separate sidewall protection steps and simplifies the overall fabrication process while maintaining precise emission area partitioning.
Solution Approach 2:
The emission defining layer serves multiple purposes simultaneously: it defines the emission area opening, protects light emitting element sidewalls from damage, and acts as an isolation layer during fabrication. This multi-functionality reduces the total number of process steps and simplifies the fabrication process complexity.
Data Source
AI summary
A display device and a method for fabrication thereof are provided. A display device includes a plurality of pixel electrodes spaced from each other on a substrate, a plurality of light emitting elements respectively located on the plurality of pixel electrodes, a common electrode layer on the plurality of light emitting elements, and an emission defining layer defining emission areas in which the plurality of light emitting elements are located, wherein the emission defining layer is in contact with a side surface of each of the plurality of light emitting elements and surrounds the side surface of each of the plurality of light emitting elements.