Stacked Light-Emitting Structure With Transparent Electrodes
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Solution Overview
Problem
Current light-emitting structures face challenges in adjusting light color and achieving high resolution due to complex structures and low luminous efficiency, particularly in emitting pure monochromatic light and improving display resolution.
Innovation Solution
A light-emitting structure with at least two stacked light-emitting layers and transparent electrodes acting as shared anodes or cathodes between them, allowing for flexible color adjustment and improved resolution by mixing light colors effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a P-N type semiconductor connected tandem laminated structure is used, then the light-emitting structure can be realized, but the structure becomes complex and the light color changes with voltage, failing to emit pure monochromatic light
Solution Approach 1:
The patent divides the light-emitting device into multiple independent light-emitting layers, each emitting a specific color (red, green, blue). Each layer is controlled independently through separate control circuits, allowing the device to emit pure monochromatic light by activating only the required layer, thereby avoiding the color mixing issue of tandem structures.
Solution Approach 2:
The patent employs a shared transparent electrode that serves as both the cathode for one light-emitting layer and the anode for the adjacent layer. This multi-functional electrode design simplifies the overall structure by reducing the number of separate electrodes and connection interfaces, thereby lowering structural complexity while maintaining reliability.
2Shape
If ultra-thin spacing layers (zinc oxide, polymer, etc.) are used between light-emitting layers, then the layers can be spaced, but the hole and electron mobility cannot be balanced, resulting in low luminous efficiency
Solution Approach 1:
The patent introduces a transparent electrode as an intermediary between light-emitting layers. This electrode serves as both a structural spacer maintaining layer separation and an active component for charge injection and transport. By using a material with balanced electron and hole mobility characteristics, the transparent electrode resolves the mobility imbalance issue while maintaining the necessary spacing between layers.
3Manufacturing precision
If RGB pixels are separated to improve resolution, then high resolution can be achieved, but the light color adjustment capability is limited
Solution Approach 1:
The patent transitions from a planar pixel arrangement to a vertical stacked architecture where multiple light-emitting layers are arranged in the thickness direction. This dimensional change allows each pixel location to emit multiple colors by selectively activating different layers, thereby maintaining high resolution while significantly enhancing light color adjustment capability through independent control of each layer.
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
The structure simplifies the light-emitting process, enhances color adjustment capabilities, and increases display resolution by allowing for the precise mixing of light colors, suitable for both display and illuminating applications.
Implementation Method 1
a transparent electrode, which is disposed between the adjacent light-emitting layers
Implementation Method 2
The light-emitting layer is mainly used to emit red light, green light or blue light
Data Source
AI summary
Provided in embodiments of the present disclosure are a light-emitting structure, a display apparatus and an illuminating apparatus. The light-emitting structure includes at least two light-emitting layers stacked layer by layer, wherein the at least two light-emitting layers are used to emit at least two colors; and a transparent electrode, which is disposed between adjacent light-emitting layers. By means of providing the transparent electrode between adjacent light-emitting layers, the present disclosure adjusts the light colors of the light-emitting structure effectively, and improves the resolution of the light-emitting structure.