Display Device Electrode Material and Thickness Optimization
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Solution Overview
Problem
Current display device fabrication processes are inefficient, particularly in the use of electrodes and materials for light emitting elements, leading to suboptimal performance and increased production costs.
Innovation Solution
The use of a substrate with a pixel area including emission and non-emission areas, where the light emitting element is connected to electrodes made of different conductive materials (amorphous indium tin oxide and crystalline indium tin oxide) with varying thicknesses, and an auxiliary insulating layer to enhance the fixation and alignment of the light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the light emitting element is aligned using conventional methods, then the alignment process is simple, but the alignment precision and fixation reliability are insufficient
Solution Approach 1:
The patent introduces an auxiliary insulating layer as an intermediary component between the light emitting element and the substrate. This layer includes a first region that contacts the light emitting element and a second region that contacts the substrate, serving as a mediator to achieve precise alignment and reliable fixation without complex fabrication processes
Solution Approach 2:
The auxiliary insulating layer is segmented into functionally distinct regions: a first region for contacting and aligning with the light emitting element, and a second region for contacting and fixing to the substrate. This segmentation allows each region to be optimized for its specific function, improving overall alignment precision and fixation reliability
2Productivity
If electrodes of uniform material and thickness are used, then the fabrication process is simplified, but the light output efficiency and device performance are suboptimal
Solution Approach 1:
The patent applies local quality by using different conductive materials with different thicknesses for the first electrode and second electrode. The first electrode uses a material and thickness optimized for its specific location and function, while the second electrode uses different material and thickness parameters, allowing each electrode to be locally optimized for maximum light output efficiency
Solution Approach 2:
The patent changes the parameters of the electrodes by using different conductive materials (e.g., ITO for first electrode, IZO or IGZO for second electrode) and different thicknesses. This parameter variation optimizes the electrical and optical properties at different locations, improving overall device performance without excessive complexity
3Reliability
If the same conductive material is used for both electrodes, then the material selection is simplified, but the device performance and light emission characteristics are compromised
Solution Approach 1:
The patent employs composite materials by combining different conductive oxide materials for the first and second electrodes. The first electrode uses one conductive material (e.g., ITO) while the second electrode uses a different conductive material (e.g., IZO or IGZO), creating a composite electrode structure that leverages the complementary properties of different materials to enhance device performance and reliability
Data Source
AI summary
A display device may include: a substrate including a plurality of pixel areas each including an emission area and a non-emission area; and a pixel located in each of the pixel areas. The pixel may include: a light emitting element including a first end and a second end that face each other; a first electrode located on the first end of the light emitting element and electrically connected to the first end; and a second electrode located on the second end of the light emitting element and electrically connected to the second end. The first electrode and the second electrode may include different conductive materials, and have different thicknesses.