Light-Emitting Display Structure With Etched Grooves for Light Extraction
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Solution Overview
Problem
Current display devices face challenges in enhancing light emission efficiency and process efficiency while maintaining reduced manufacturing costs, particularly in forming concavo-convex patterns on light emitting elements without separate process steps.
Innovation Solution
A display device and manufacturing method that incorporate a concavo-convex pattern on the light emitting element by forming grooves in the second semiconductor layer exposed through openings in the insulating layer, integrated with the process of forming the pixel circuit, using etching gases like boron trichloride and chlorine to create conductive patterns and grooves, thereby increasing light extraction efficiency and eliminating the need for a separate process step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a separate process step is used to form the concavo-convex pattern on the light emitting element, then the light extraction efficiency is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the formation of the concavo-convex pattern on the light emitting element with the existing pixel circuit formation process. Specifically, the pattern is created by integrating etching steps for the light emitting element surface into the same process sequence used to form pixel electrodes and circuit patterns, thereby eliminating the need for a separate dedicated process step while achieving improved light extraction efficiency
2Illumination intensity
If a separate process step is used to form the concavo-convex pattern, then the light emission efficiency is improved, but the manufacturing time and cost increase
Solution Approach 1:
The patent merges the concavo-convex pattern formation process with the pixel circuit fabrication process by using the same etching equipment and process conditions. The pattern is formed during the same manufacturing cycle used to create pixel electrodes and conductive patterns, thereby reducing total manufacturing time while maintaining improved light emission efficiency
3Illumination intensity
If the concavo-convex pattern is formed by etching the light emitting element surface, then the light extraction efficiency is improved, but the process difficulty increases
Solution Approach 1:
The patent employs existing etching equipment and process conditions used for forming pixel circuits and conductive patterns to also create the concavo-convex pattern on the light emitting element. By using the same equipment and process parameters, the patent avoids the need for specialized equipment or complex additional process steps, thereby maintaining ease of manufacture while achieving improved light extraction efficiency
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
The approach enhances light emission efficiency by minimizing light loss through the concavo-convex pattern and increases process efficiency by integrating the pattern formation with existing pixel circuit processes, reducing manufacturing costs and time.
Implementation Method 1
using etching gases like boron trichloride and chlorine to create conductive patterns and grooves
Data Source
AI summary
A display device includes: a substrate; a connection electrode on the substrate; a light emitting element on the connection electrode and including a first semiconductor layer, an active layer, and a second semiconductor layer sequentially arranged in a third direction; and an insulating layer covering the connection electrode and the light emitting element. The insulating layer has openings spaced apart from each other and exposing the second semiconductor layer of the light emitting element, and the second semiconductor layer has a plurality of grooves corresponding to the openings in the insulating layer.