Light-Emitting Layer Film Thickness Control via Radical Polymerization
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Solution Overview
Problem
Existing display devices face challenges in precisely forming a light-emitting layer with appropriate film thickness due to the coffee ring phenomenon and unsuitable polymer resin materials when using the dripping technique.
Innovation Solution
The use of an oxetane monomer, an epoxy monomer, and a radical polymerization initiator in the light-emitting layer allows for precise formation of a light-emitting layer with appropriate film thickness, even when formed using a dripping technique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dripping technique is used to form the light-emitting layer, then manufacturing cost and ease of production are improved, but film thickness precision deteriorates due to the coffee ring phenomenon
Solution Approach 1:
The patent changes the chemical composition parameters of the solution by incorporating specific polymer resin materials (polymer or monomer with radical polymerization initiator) to control the drying behavior and film formation process, thereby achieving uniform film thickness despite using the dripping technique
Solution Approach 2:
The patent converts the harmful coffee ring phenomenon into a beneficial effect by utilizing the localized concentration changes during drying to trigger controlled polymerization reactions, which ultimately lead to uniform film formation and appropriate thickness
2Ease of manufacture
If a dripping technique is used to form the light-emitting layer, then manufacturing simplicity is improved, but display performance deteriorates due to improper film thickness
Solution Approach 1:
The patent modifies the solution composition by adding specific polymer resin materials and radical polymerization initiators, which change the chemical and physical parameters of the solution to ensure proper film thickness and prevent display performance deterioration
Solution Approach 2:
The patent performs preliminary polymerization initiation during the drying process itself, ensuring that the film forms with appropriate thickness and uniformity before the light-emitting layer is fully deposited, thereby preventing display performance issues
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 approach prevents display performance deterioration by ensuring precise film thickness and patterning of the light-emitting layer, thereby maintaining luminous efficiency and preventing current leakage.
Implementation Method 1
an oxetane monomer, an epoxy monomer, and a radical polymerization initiator are used
Implementation Method 2
a solution (droplets) containing a functional material (that is, luminescent material) of the light-emitting layer and a predetermined solvent is dripped or applied, and then the solution is dried (the solvent is evaporated) to form the light-emitting layer
Data Source
AI summary
A display device provided with a display region including a plurality of pixels and a frame region surrounding the display region includes a thin film transistor layer, a light-emitting element layer including a plurality of light-emitting elements, each including a first electrode, a light emitting layer, and a second electrode, and each having a different luminescent color. In the light-emitting layer, an oxetane monomer, an epoxy monomer, and a radical polymerization initiator are used.