Stacked Electroluminescent Elements with Crosstalk Control
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Solution Overview
Problem
Existing electroluminescent elements face challenges with reduced light output and significant crosstalk between adjacent elements, limiting their efficiency and flexibility in applications such as displays and lighting.
Innovation Solution
The configuration of conductive materials on substrates allows for simultaneous energization while preventing crosstalk through the use of a semiconductor layer for switch threshold control and the inclusion of hole and electron transport layers, enabling vertical or horizontal stacking and flexible configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conductive materials are configured to enable simultaneous energization of stacked elements, then light output is improved, but crosstalk between adjacent elements increases
Solution Approach 1:
The conductive material is segmented into distinct first and second conductive materials with different geometries. The first conductive material has a first geometry optimized for electrical connection, while the second conductive material has a second geometry optimized for light emission. This segmentation allows independent optimization of electrical performance and optical performance, enabling simultaneous energization of stacked elements while maintaining electrical isolation to prevent crosstalk between adjacent elements.
2Productivity
If hole transport and electron transport layers are added to enhance charge efficiency, then light production control is improved, but device complexity increases
Solution Approach 1:
The hole transport layer and electron transport layer are designed to perform multiple functions simultaneously. These layers not only transport charges but also serve as part of the encapsulation structure and provide mechanical support. By making these layers multi-functional, the patent achieves improved charge transport efficiency and light production control without proportionally increasing device complexity.
3Area of moving object
If stacked construction is used to increase light output in compact areas, then area efficiency is improved, but crosstalk between layers increases
Solution Approach 1:
The patent applies local quality by giving different geometries to conductive materials at different locations and layers. The first conductive material in lower layers has a geometry that provides strong electrical connection for energization, while the second conductive material in upper layers has a geometry optimized for light emission with reduced electrical field leakage. This local optimization allows stacked construction for area efficiency while minimizing crosstalk between layers through geometry-based electrical isolation.
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 output, reduces crosstalk, and allows for flexible and efficient construction of electroluminescent elements, enabling improved performance in displays and lighting applications with reduced impact on structural integrity.
Implementation Method 1
The hole transport substance is designed to improve and promote the transport efficiency of positive charge within the element
Implementation Method 2
The electron transport layer may improve the flow of negatively charged particles
Implementation Method 3
Electroluminescent (EL), Organic Light Emitting Diode (OLED), and light emitting polymers are known
Data Source
AI summary
An electroluminescent element comprises at least the following layers, in sequence: a first substrate (1), a first conductive layer (2), a first dielectric layer (3), a first light emitting layer (4), a second conductive layer (5), a second light emitting layer (4′), a second dielectric layer (3′), a third conductive layer (2′), and a second substrate (6). At least one of the first and second substrates (1, 6) is transparent or translucent; and at least some of the layers are transparent or translucent so as to allow light from the first and/or second light emitting layers (4, 4′) to be emitted through the transparent substrate or substrates (1, 6). The second conductive layer (5) may be encapsulated between the first and second light emitting layers (4) and between the first and second dielectric layers (3, 3′). The elements may be stacked horizontally or vertically.