Organic Electroluminescent Device Scan Line Placement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic electroluminescent devices have limited space efficiency due to scan lines being formed outside the metal line layers, which restricts the number of devices that can be formed on a substrate.
Innovation Solution
The formation of scan lines between indium tin oxide (ITO) films, along with insulating and organic layers, and metal line layers that cross over the ITO films, allows for a more compact design by placing data and scan line connection sections on the same plane, optimizing substrate space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If scan lines are formed outside the metal line layers, then the device structure is simple and easy to manufacture, but the substrate space is reduced and the number of devices per substrate decreases
Solution Approach 1:
The scan lines are moved from the conventional position outside the metal line layers to a position between the ITO films, utilizing the vertical stacking dimension. This allows scan lines and metal line layers to coexist in the same horizontal plane at different vertical levels, effectively increasing substrate space utilization and enabling higher device density without complicating the manufacturing process
2Ease of manufacture
If scan lines are formed outside the metal line layers, then the manufacturing process is conventional and straightforward, but the device size is larger and brightness is reduced
Solution Approach 1:
By positioning scan lines between ITO films at a different vertical level, the invention allows the luminescent area to extend to the edges of the substrate without being interrupted by scan lines. This maximizes the light-emitting area and enhances brightness while maintaining manufacturing simplicity through conventional layer-by-layer deposition processes
3Device complexity
If scan lines are formed outside the metal line layers, then the device structure is conventional, but the space occupation is increased and device density is reduced
Solution Approach 1:
The scan lines are nested within the structure formed by the ITO films, specifically positioned between them in the vertical stacking sequence. This nesting approach allows scan lines to occupy space that would otherwise be unused, enabling higher device density on the substrate while maintaining a relatively simple overall device structure
Solution Approach 2:
The invention utilizes the vertical dimension by placing scan lines at a different vertical level than the metal line layers, allowing both to coexist in the same horizontal footprint. This dimensional reorganization maximizes substrate space utilization and increases the number of devices that can be formed per substrate
Data Source
AI summary
The present invention relates to an organic electroluminescent device including scan lines formed in parallel with ITO films between the ITO films. The organic electroluminescent device includes ITO films, scan lines, an insulating layer, organic layers, and metal layers. The ITO films are formed on a substrate. The scan lines each are formed between the ITO films on the substrate. The insulating layer is formed on other areas than luminescent areas of the ITO films and connection areas of the scan lines. The organic layers are formed on the luminescent areas. The metal line layers are formed on the organic layers and the connection area, wherein the metal line layers cross over the ITO films. In the organic electroluminescent device, the scan lines are formed between ITO films. Therefore, the brightness of the organic electroluminescent device can be enhanced, or the size of the organic electroluminescent device can be reduced.