OLED Encapsulation Moisture Layer for Uniform Ink Spreading
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Solution Overview
Problem
Existing methods for forming organic encapsulation layers in OLED panels often result in uneven thickness, leading to encapsulation failures and quality issues due to difficulties in evenly spreading organic ink on inorganic encapsulation layers.
Innovation Solution
A light-emitting panel structure comprising a moisture layer made of amphiphilic surface active materials on the peripheral area of a first inorganic layer, which moistens the area to facilitate even spreading of organic ink, forming a uniform organic encapsulation layer, and a second inorganic layer is laminated on top, with both inorganic layers being made of silicon nitride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If organic ink is sprayed on inorganic encapsulation layer using existing methods, then organic encapsulation layer is formed, but the thickness is uneven leading to encapsulation failure
Solution Approach 1:
A moisture layer made of amphiphilic surface active material is introduced as an intermediary between the inorganic encapsulation layer and the organic ink. This moisture layer modifies the surface properties to enable uniform spreading of the hydrophobic organic ink, resulting in even thickness distribution and preventing encapsulation failure.
Solution Approach 2:
The surface energy parameters of the inorganic encapsulation layer are changed by applying a moisture layer with amphiphilic surface active material. This parameter change transforms the surface from hydrophilic to having balanced hydrophobic and hydrophilic characteristics, allowing uniform deposition of organic ink.
2Ease of manufacture
If organic ink is sprayed directly on inorganic encapsulation layer, then encapsulation layer is formed, but uneven spreading occurs due to surface properties
Solution Approach 1:
The moisture layer acts as a mediator that facilitates the spreading of organic ink across the inorganic encapsulation layer. The amphiphilic nature of the moisture layer material allows it to bridge the hydrophilic inorganic surface and hydrophobic organic ink, enabling uniform coverage.
Solution Approach 2:
The moisture layer is applied specifically to the peripheral area of the inorganic encapsulation layer where uniform spreading is most critical. This localized application improves ink distribution without requiring treatment of the entire surface.
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 ensures a uniform thickness of the organic encapsulation layer, reducing encapsulation failure rates and improving the quality of OLED panels by ensuring even ink distribution and adherence.
Implementation Method 1
a moisture layer disposed on a peripheral area of the first inorganic layer and configured to moisten the peripheral area of the first inorganic layer so that the organic ink is evenly spread
Implementation Method 2
the moisture layer is made of an amphiphilic surface active material including at least one of quaternary ammonium salt, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, polyvinyl alcohol, and polyvinyl chloride
Data Source
AI summary
A light-emitting panel, a method of manufacturing the light-emitting panel, and a display device include a light-emitting substrate, a first inorganic layer, an organic encapsulation layer, and a second inorganic layer laminated with each other from bottom to top in turn. The organic encapsulation layer is made of an organic ink. A moisture layer is disposed on a peripheral area of the first inorganic layer and is configured to moisten the peripheral area of the first inorganic layer so that the organic ink is evenly spread on the first inorganic layer prior to formation of the organic encapsulation layer.