Light-Emitting Element Grooves for Higher Extraction Efficiency
Find Innovative SolutionsGenerate Solutions
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 adding separate process steps.
Innovation Solution
A display device is designed with a concavo-convex pattern on the surface of light emitting elements, achieved 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, which increases light extraction efficiency and omits the need for a separate process step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a separate process step is added to form concavo-convex patterns on light emitting elements, then light extraction efficiency is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the formation of concavo-convex patterns on light emitting elements with the existing pixel circuit formation process. The etching step that creates the concavo-convex pattern is integrated into the pixel circuit fabrication sequence, allowing both structures to be formed simultaneously without adding a separate process step. This merging of operations resolves the contradiction by achieving improved light extraction efficiency while maintaining manufacturing process simplicity.
2Illumination intensity
If a separate process step is added to form concavo-convex patterns, then light emission efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates concavo-convex pattern formation into the existing pixel circuit fabrication process, eliminating the need for a separate manufacturing step. By combining these operations, the patent achieves improved light emission efficiency through the enhanced light extraction provided by the concavo-convex structure while avoiding the additional manufacturing costs that would result from a separate process step.
3Productivity
If process efficiency is improved by integrating steps, then manufacturing time is reduced, but process precision requirements increase
Solution Approach 1:
The patent merges the concavo-convex pattern formation with pixel circuit fabrication into a single integrated process. This integration improves process efficiency by eliminating separate manufacturing steps while managing precision requirements through careful process design. The etching parameters and sequence are optimized to achieve both the concavo-convex pattern and pixel circuit structures with appropriate precision within the unified process.
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 approach enhances light emission efficiency and reduces manufacturing costs by integrating the concavo-convex pattern formation into the existing pixel circuit process, thereby improving process efficiency and minimizing light loss.
Implementation Method 1
forming a concavo-convex pattern on one surface of the light emitting element from which light is emitted and a method of manufacturing the same
Data Source
Figure 1
Figure 2
Figure 3
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.