Reflective Electrode Layout for Efficient Light-Emitting Displays
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Solution Overview
Problem
Existing display devices face challenges in improving light emission efficiency, reducing the risk of voltage drop in electrical signals, and minimizing electrical connection defects due to misalignment of light emitting elements.
Innovation Solution
The display device incorporates a cathode electrode with a base and bridge configuration, where the base cathode electrode covers a wider area than the bridge, and is electrically connected to a reflective electrode layer forming a reflective surface for the light emitting element, while the anode and cathode electrodes are formed as a single layer with the same conductive material, and transparent electrodes are connected to form a continuous layer without overlapping the reflective electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional electrode structure is used, then the device structure is simple, but the light emission efficiency is insufficient
Solution Approach 1:
The electrode structure is segmented into multiple functional layers: reflective electrode layers (anode and cathode) and transparent electrode layers (anode and cathode). This segmentation allows each layer to perform its specific function optimally - reflective layers for electrical connection and light reflection, transparent layers for light transmission - thereby improving light emission efficiency while maintaining manageable structural complexity
Solution Approach 2:
The patent introduces a vertical stacking dimension to the electrode structure, creating multiple layers at different heights. The reflective electrode layers are positioned at the bottom while transparent electrode layers are positioned above them, creating a three-dimensional electrode architecture that enhances both electrical performance and optical efficiency
2Reliability
If the cathode electrode covers a wider area, then the electrical connection stability is improved, but the risk of voltage drop increases
Solution Approach 1:
The cathode electrode is segmented into two distinct parts: a base cathode electrode with wider area coverage for stable electrical connection, and a bridge cathode electrode that connects to the light emitting element. This segmentation allows the wider base to provide stability while the bridge portion maintains efficient electrical connection, preventing voltage drop
Solution Approach 2:
Different regions of the cathode electrode are given different properties: the base cathode electrode has a wider area for stability, while the bridge cathode electrode is positioned specifically to optimize electrical connection to the light emitting element. This local differentiation of electrode properties resolves the contradiction between connection stability and voltage drop prevention
3Reliability
If transparent electrode layers overlap with reflective electrode layers, then the electrical connection is enhanced, but misalignment defects occur
Solution Approach 1:
Instead of horizontal overlapping of transparent and reflective electrode layers, the patent uses vertical stacking - transparent electrode layers are positioned above reflective electrode layers in the vertical dimension. This dimensional change eliminates alignment issues while maintaining electrical connection through the vertical stack
Solution Approach 2:
The patent introduces intermediate insulating layers and banks as mediators between the transparent and reflective electrode layers. These intermediary structures provide precise positioning and electrical isolation, ensuring that the transparent electrodes are correctly aligned with reflective electrodes without direct overlapping, thereby preventing misalignment defects
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 configuration enhances light emission efficiency and reduces the risk of voltage drop and electrical connection defects, ensuring stable electrical connections and improved display performance.
Implementation Method 1
a cathode reflective electrode layer disposed on the cathode electrode... the cathode reflective electrode layer may form a reflective surface for the light emitting element
Data Source
AI summary
There are provided a display device and a method of manufacturing the display device. The display device includes: a substrate; and a display element layer disposed on the substrate. The display element layer includes: an anode electrode and a cathode electrode; an anode reflective electrode layer disposed on the anode electrode; a cathode reflective electrode layer disposed on the cathode electrode; a light emitting element including a first element electrode and a second element electrode; an anode transparent electrode layer electrically connecting the anode reflective electrode layer and the first element electrode to each other; and a cathode transparent electrode layer electrically connecting the cathode reflective electrode layer and the second element electrode to each other.