Display Device Vertical Light Emitting Element Arrangement
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Solution Overview
Problem
Current display devices face challenges in maximizing the number of light emitting elements per unit area, leading to limitations in luminance and efficiency due to the parallel arrangement of these elements on substrates.
Innovation Solution
The display device incorporates a unique arrangement where light emitting elements are disposed non-parallel to the substrate, with a specific configuration of electrodes and insulating layers that allow for increased density and efficient packing of light emitting elements, including first and second electrodes, connection electrodes, and insulating layers to surround and connect the elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If light emitting elements are arranged in parallel on the substrate, then the device structure is simple and easy to manufacture, but the number of light emitting elements per unit area is limited
Solution Approach 1:
The patent transitions from a two-dimensional parallel arrangement to a three-dimensional vertical arrangement by disposing light emitting elements on the side surface of the first electrode rather than on the substrate plane. This dimensional change allows multiple light emitting elements to be stacked vertically, significantly increasing the number of elements per unit area while maintaining manufacturing feasibility through standardized assembly processes
2Quantity of substance
If light emitting elements are disposed vertically on the first electrode, then the number of light emitting elements per unit area increases, but the electrical connection complexity increases
Solution Approach 1:
The patent implements a nested connection structure where the second electrode is positioned inside the opening of the first insulating layer, and connection electrodes are embedded within the insulating layers to establish electrical pathways. This nesting approach allows multiple electrical connections to be integrated within the vertical stack, managing connection complexity while supporting high-density light emitting element arrangements
3Reliability
If more insulating layers and connection electrodes are added to support vertical arrangement, then the electrical connections become more reliable, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the device into distinct functional layers including first insulating layer, second insulating layer, connection electrodes, and light emitting elements. Each layer is independently formed and positioned, allowing for modular manufacturing and assembly. This segmentation enables reliable electrical connections through standardized interfaces while maintaining manufacturing efficiency through repeated use of the same fabrication processes for each layer
Data Source
AI summary
A display device includes first electrodes comprising a first sub-electrode and a second sub-electrode, a first insulating layer comprising openings partially exposing upper surfaces of the first electrodes, second electrodes disposed on the first insulating layer and overlapping the first electrodes in a plan view, light emitting elements disposed on the first electrodes and comprising first light emitting elements and second light emitting elements, first connection electrodes to contact first ends of the light emitting elements and the first electrodes, a second insulating layer to surround the light emitting elements, and second connection electrodes. The first connection electrodes include a first electrode part and a second electrode part. The second connection electrodes include a third electrode part and a fourth electrode part.