Differential Resistance Electrodes for Light-Emitting Element Alignment
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Solution Overview
Problem
Existing display devices face challenges in achieving reliable alignment and arrangement of light-emitting elements on electrodes, leading to inconsistent light emission and reduced fabrication yields.
Innovation Solution
The use of electrodes with varying electrical resistance regions, where the light-emitting elements are aligned and connected to regions with specific resistance characteristics, such as indium tin oxide and aluminum, to ensure proper alignment and emission, involves forming electrodes with alternating high and low resistance areas and treating them with ions or plasma to enhance resistance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting elements are directly formed on electrodes without alignment control, then the fabrication process is simple, but the alignment precision deteriorates leading to inconsistent light emission
Solution Approach 1:
The electrode is divided into multiple regions with different electrical resistance characteristics. High resistance regions are positioned to align with light-emitting elements, while low resistance regions are positioned elsewhere. This local differentiation of electrical resistance properties enables precise alignment control of light-emitting elements without requiring complex external alignment mechanisms, thereby improving manufacturing precision while maintaining relatively simple device structure.
2Manufacturing precision
If additional alignment steps are performed to align light-emitting elements to electrodes, then the alignment precision improves, but the fabrication complexity and time increase
Solution Approach 1:
The electrode structure itself provides the alignment function through its differential resistance regions. During fabrication, the light-emitting elements naturally align to the high resistance regions of the electrode due to the electrical field distribution, eliminating the need for separate alignment steps. This self-aligning mechanism maintains high alignment precision while avoiding additional fabrication steps, thereby improving productivity and fabrication yield.
3Manufacturing precision
If electrodes with varying resistance regions are used to control light-emitting element alignment, then the alignment precision improves, but the manufacturing complexity increases
Solution Approach 1:
The electrode is fabricated with spatially varying electrical resistance parameters. By controlling the resistance distribution pattern during electrode formation, the high resistance regions are positioned to correspond with desired light-emitting element locations. This parameter variation approach enables precise alignment control while using standard electrode fabrication techniques, balancing manufacturing precision with ease of manufacture.
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 improves the fabrication yield and reliability of display devices by ensuring precise alignment and consistent light emission through differential electric fields, enhancing the display's overall performance.
Implementation Method 1
the arrangement position of the light-emitting element is controlled by first electrode and second electrodes of the display, whose electrical resistance varies from region to region
Implementation Method 2
treating them with ions or plasma to enhance resistance differences
Implementation Method 3
treating them with ions or plasma to enhance resistance differences
Data Source
AI summary
A method of fabricating a display device includes forming a circuit layer on a base layer, forming a first preliminary electrode and a second preliminary electrode on the circuit layer, forming a photoresist layer on the first preliminary electrode and the second preliminary electrode, patterning the photoresist layer to form a photoresist pattern, treating a region of each of the first preliminary electrode and the second preliminary electrode to form a first electrode and a second electrode having regions of lower and higher electrical resistance, and disposing a light-emitting element on the first electrode and the second electrode at regions having lower electrical resistance.