Vertical Light-Emitting Display Structure With Moisture Barrier Layer
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Solution Overview
Problem
Existing display devices face challenges in easily forming light-emitting elements and preventing short circuits, particularly in organic light-emitting diodes, which are vulnerable to external moisture and oxygen, affecting lifespan and reliability.
Innovation Solution
The display device incorporates a substrate with a pixel electrode, a bank defining a light-emitting area, a first organic layer made of a polyimide-based compound with a cyano group, and a planarization layer filled between light-emitting elements, along with a common electrode, to facilitate easy formation of light-emitting elements and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If organic light-emitting diodes are used to enhance light emission efficiency, then light emission efficiency is improved, but vulnerability to external moisture and oxygen increases, affecting lifespan and reliability
Solution Approach 1:
The encapsulation structure is divided into multiple functional layers: a lower encapsulation layer (first encapsulation layer) that provides initial protection, and an upper encapsulation layer (second encapsulation layer) that provides additional protection. This segmented approach allows each layer to perform specific protective functions, creating a comprehensive barrier against moisture and oxygen while maintaining the light emission efficiency of the organic LED.
Solution Approach 2:
The patent applies beforehand cushioning by pre-establishing a multi-layer encapsulation structure before the organic light-emitting diode is exposed to the external environment. This encapsulation structure is designed in advance to provide protective cushioning against moisture and oxygen, preventing their harmful effects on the organic LED and thereby extending its lifespan and improving reliability.
2Reliability
If a multi-layer encapsulation structure is added to protect against moisture and oxygen, then reliability is improved, but device complexity increases
Solution Approach 1:
The encapsulation layers are designed to perform multiple functions simultaneously: they provide protection against moisture and oxygen, serve as structural support, and maintain the optical properties necessary for light emission. By making the encapsulation structure multi-functional, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving improved reliability.
3Use of energy by moving object
If light-emitting elements are formed with extended vertical dimension to improve light emission, then light emission efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs thin-film encapsulation layers that can conform to the extended vertical dimensions of the light-emitting elements. These flexible thin films provide effective protection and maintain structural integrity even when the light-emitting elements have increased vertical height, thereby reducing the stringency of manufacturing precision requirements while still achieving improved light emission efficiency.
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 the formation of light-emitting elements, improves lifespan and reliability by protecting against moisture and oxygen, and increases light emission efficiency through a wavelength conversion layer.
Implementation Method 1
a transmittance at which light of a wavelength of about 308 nanometers (nm) transmits through the first organic layer may be smaller than a transmittance at which the light of the wavelength of about 308 nm transmits through the bank... the transmittance at which light of a wavelength of 308 nm may transmit through the first organic layer is about 0 percent (%), where an absorption at which the first organic layer absorbs the light of the wavelength of about 308 nm is about 100%
Data Source
AI summary
A display device includes a substrate, a pixel electrode disposed on the substrate, a bank covering an edge of the pixel electrode and defining a light-emitting area, a first organic layer disposed on the bank and non-overlapping the light-emitting area, a plurality of light-emitting elements arranged on the pixel electrode, where each of the plurality of light-emitting elements extends perpendicular to the pixel electrode, a planarization layer disposed on the pixel electrode, the bank and the first organic layer, where the planarization layer is filled between the plurality of light-emitting elements, and a common electrode disposed on the planarization layer and the plurality of light-emitting elements, where the first organic layer is disposed between the bank and the planarization layer, and overlaps the bank.