Connection Electrode Layer for Light Emitting Element Integration
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Solution Overview
Problem
Current display devices face challenges in efficiently integrating light emitting elements with substrates, particularly in forming smooth connections that enhance electrical contact and light emission efficiency.
Innovation Solution
A display device design that utilizes a sacrificial layer to separate light emitting elements from a temporary substrate, forming a connection electrode layer with a smooth surface that directly contacts the pixel electrode, and includes an electrode layer, semiconductor layers, and a superlattice layer to improve electrical connection and light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting elements are directly integrated with substrates using conventional methods, then the integration process is simplified, but the electrical connection reliability and light emission efficiency are insufficient due to poor contact quality
Solution Approach 1:
The connection electrode layer is formed in advance on the substrate before the light emitting element is transferred and connected. This preliminary preparation of the connection interface ensures that when the light emitting element is subsequently connected, there is already a pre-formed smooth electrode surface ready to provide reliable electrical contact, thus improving connection reliability without adding complex integration steps
Solution Approach 2:
A connection electrode layer is introduced as an intermediary component between the substrate and the light emitting element. This intermediate layer serves as a mediator that enhances electrical contact quality by providing a smooth, dedicated contact surface, thereby improving reliability while the layer is integrated into the existing device structure
2Productivity
If conventional integration methods are used, then the manufacturing process is simpler, but the light emission efficiency is reduced due to poor electrical contact
Solution Approach 1:
The connection electrode layer is formed preliminarily on the substrate before the light emitting element is assembled. This advance preparation creates an optimized electrical contact interface that enhances light emission efficiency by ensuring low-resistance electrical connection, while the preliminary formation approach avoids adding complex manufacturing steps
Solution Approach 2:
The connection electrode layer provides localized quality enhancement at the specific contact interface between the substrate and light emitting element. By concentrating the improved electrical contact properties at this critical local region, the overall light emission efficiency is enhanced without requiring complex changes to the entire device structure
3Manufacturing precision
If a connection electrode layer with smooth surface is formed, then electrical contact quality improves, but the fabrication process becomes more complex
Solution Approach 1:
The smooth connection electrode layer is formed preliminarily on the substrate using standard thin film deposition techniques before the light emitting element is transferred. This preliminary formation of a smooth surface contact layer achieves high manufacturing precision for the contact interface while utilizing existing fabrication capabilities, avoiding the need for complex post-assembly processing
Data Source
AI summary
A light emitting element, a display device including the same, and method of fabricating the display device are provided. The display device including a pixel electrode on a substrate, a light emitting element on the pixel electrode, and including a first semiconductor layer, an active layer on the first semiconductor layer, and a second semiconductor layer on the active layer, a connection electrode layer between the light emitting element and the pixel electrode, and directly contacting the pixel electrode, an insulating layer on the substrate and the pixel electrode, and surrounding the light emitting element, and a common electrode on the insulating layer directly contacting the second semiconductor layer of the light emitting element.