Electroluminescent Lighting Device High Aperture Ratio
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Solution Overview
Problem
Organic light emitting elements in lighting devices are vulnerable to external environments such as moisture and oxygen, leading to degraded luminescence efficiency and reduced stability.
Innovation Solution
An electroluminescent lighting device with a substrate, power line, buffer layer, anode layer, emission layer, and cathode layer, featuring a point contact structure with an insulation buffer layer between the anode electrode and auxiliary power line, and an encapsulation layer to protect against moisture and oxygen, enhancing aperture ratio and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power line is directly contacted with the anode electrode, then the electrical connection is simple, but the risk of short circuit increases and the emission area is reduced
Solution Approach 1:
The patent introduces a buffer layer as an intermediary component between the power line and the anode electrode. This buffer layer acts as a mediator that provides both electrical connection and insulation, eliminating the direct contact that causes short circuits while maintaining device reliability. The buffer layer is specifically positioned to contact the power line at designated points while insulating other areas, thus preventing short circuits without requiring additional complex hardware.
Solution Approach 2:
The patent transitions from a two-dimensional planar contact structure to a three-dimensional stacked structure. By stacking the buffer layer between the power line and anode electrode, the design utilizes the vertical dimension to achieve both electrical connection and insulation simultaneously. This dimensional change allows the power line to be positioned below the anode electrode while maintaining connection through the buffer layer, thereby preventing short circuits and maximizing the emission area.
2Reliability
If the power line occupies more area, then the electrical connection is more robust, but the aperture ratio is reduced
Solution Approach 1:
The patent segments the power line structure into multiple functional zones along its length. The power line is divided into a first portion that contacts the buffer layer for electrical connection, and a second portion that is insulated by the buffer layer to prevent short circuits. This segmentation allows different sections of the power line to serve different purposes, maintaining robust electrical connection while minimizing the area occupied by the power line structure and maximizing the aperture ratio.
Solution Approach 2:
The buffer layer exhibits local quality variations along the power line. At certain locations, the buffer layer provides electrical contact with the power line, while at other locations, it provides insulation. This localized differentiation of the buffer layer's function allows the power line to maintain robust electrical connection where needed while being insulated where direct contact would cause short circuits, thereby optimizing both connection robustness and aperture ratio.
3Device complexity
If the organic light emitting element is exposed to external environment, then the device structure is simple, but the luminescence efficiency degrades due to moisture and oxygen
Solution Approach 1:
The patent employs the buffer layer as a flexible thin film structure that provides encapsulation and protection to the organic light emitting element. This thin film approach offers effective barrier protection against moisture and oxygen penetration while maintaining device flexibility and not significantly increasing structural complexity. The buffer layer's thin film nature allows it to conform to the device structure while providing comprehensive protection, thus improving luminescence efficiency stability without substantial complexity increase.
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 solution protects the light emitting element from external environments, improves luminescence efficiency, and achieves a high aperture ratio and extended lifetime by maximizing the emission area and preventing short circuits without additional hardware.
Implementation Method 1
an electroluminescent lighting device including: a substrate having an emission area and a non-emission area surrounding the emission area; a power line disposed in the emission area and defining an open area
Data Source
AI summary
The present disclosure relates to an electroluminescent lighting device having high aperture ratio. The present disclosure provides an electroluminescent light device comprising: a substrate having an emission area and a non-emission area surrounding the emission area; a power line disposed in the emission area and defining an open area; a buffer layer covering the substrate having the power line; a power contact hole formed at the buffer layer for exposing some of the power line; an anode layer disposed on the buffer layer and contacting the power line through the power contact hole; a passivation layer covering the power contact hole on the anode layer; an emission layer on the anode layer; and a cathode layer on the emission layer.