Inkjet Printing Organic Light Emitting Layer Uniformity
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Solution Overview
Problem
The formation of organic light emitting layers in display devices often results in non-uniform thickness due to fine residual substances on the anode electrode, affecting wetting and display quality.
Innovation Solution
A method involving the use of an ink non-reactive solvent with a boiling point of 70°C or higher, discharged through an inkjet print device, to create a uniform layer on the anode electrode before applying organic light emitting ink, ensuring improved wetting and uniform thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic light emitting ink is discharged directly on the anode electrode, then the process is simple, but the thickness of the organic light emitting layer becomes non-uniform due to fine residual substances affecting wetting
Solution Approach 1:
The patent applies preliminary action by discharging an ink non-reactive solvent on the anode electrode before discharging the organic light emitting ink. This preliminary solvent treatment modifies the surface properties of the anode electrode, improving wetting characteristics and ensuring uniform distribution of the subsequent ink layer, thereby achieving uniform thickness despite the presence of fine residual substances
Solution Approach 2:
The ink non-reactive solvent acts as an intermediary substance between the anode electrode and the organic light emitting ink. It mediates the interaction by creating a uniform surface layer that enhances wetting and ink distribution, resolving the contradiction between process simplicity and manufacturing precision
2Productivity
If fine residual substances remain on the anode electrode after forming the pixel-defining film, then the manufacturing process is efficient, but wetting of the organic light emitting ink deteriorates
Solution Approach 1:
The ink non-reactive solvent serves as an intermediary that bridges the gap between the anode electrode with residual substances and the organic light emitting ink. It improves wetting quality by modifying surface properties without requiring additional cleaning steps, thus maintaining manufacturing efficiency while enhancing reliability
Solution Approach 2:
The patent changes the physical-chemical parameters of the anode electrode surface by applying the ink non-reactive solvent. This alters surface energy and wettability characteristics, enabling better ink adhesion and distribution without compromising manufacturing 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 approach enhances the uniformity of the organic light emitting layer, leading to improved display quality by preventing residual substances from interfering with ink wetting and allowing for consistent light emission.
Implementation Method 1
fine residual substances which are invisible to the naked eye may remain on the anode electrode, and such fine residual substances may affect or deteriorate wetting of the organic light emitting ink
Implementation Method 2
forming an ink non-reactive solvent portion by discharging an ink non-reactive solvent at the opening and forming an organic light emitting layer by discharging an organic light emitting ink on the ink non-reactive solvent portion
Data Source
AI summary
A method for fabricating an organic light emitting display device includes forming a first electrode on a substrate; forming a pixel-defining film having an opening exposing the first electrode; forming an ink non-reactive solvent portion by discharging of an ink non-reactive solvent at the opening and forming an organic light emitting layer by discharging an organic light emitting ink on the ink non-reactive solvent portion; and forming a second electrode on the organic light emitting layer.