Light-Emitting Element Ink Using Phase-Change Solvent Stability
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Solution Overview
Problem
Existing light-emitting element inks precipitate during storage, leading to non-uniform distribution and reduced product reliability in display apparatus manufacturing.
Innovation Solution
A light-emitting element ink with a solvent having a high melting point, typically between 0°C to 15°C, is used to disperse light-emitting elements, allowing for uniform distribution and alignment on a substrate through a spraying process followed by a heat treatment to solidify the solvent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a solvent with low melting point is used to disperse light-emitting elements, then the dispersion is uniform during manufacturing, but the light-emitting elements precipitate during storage
Solution Approach 1:
The patent changes the melting point parameter of the solvent from low to high (above 0°C), which fundamentally alters the storage behavior. The high melting point solvent remains solid at room temperature, preventing precipitation, while still enabling uniform dispersion during the manufacturing process when heated above its melting point.
Solution Approach 2:
The patent utilizes phase transition of the solvent between solid and liquid states. During storage, the solvent remains in solid state (preventing precipitation). During manufacturing, the solvent is heated to melt and transition to liquid state (enabling uniform dispersion). This phase transition mechanism resolves the contradiction between storage stability and manufacturing uniformity.
2Reliability
If a solvent with high melting point is used, then light-emitting elements remain dispersed during storage, but the solvent requires higher temperature for processing
Solution Approach 1:
The patent selects a specific melting point range (above 0°C) that balances storage stability and processing requirements. This parameter optimization ensures the solvent is stable at room temperature but can be processed with moderate heating, avoiding excessive temperature requirements.
3Ease of manufacture
If light-emitting elements are stored in liquid state, then they can be easily processed, but they precipitate and distribute inconsistently
Solution Approach 1:
The patent uses phase transition control to resolve this contradiction. The solvent is kept in solid state during storage (preventing precipitation and ensuring consistency). During processing, the solvent is heated to liquid state (enabling easy processing and uniform distribution). The phase transition timing controls both consistency and processability.
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
Prevents precipitation of light-emitting elements, ensuring uniform distribution and improved product reliability by maintaining high dielectrophoretic reactivity during the printing process.
Implementation Method 1
the light-emitting element solvent includes a fatty acid ester-based compound having a melting point in a range of 0° C. to 15° C.
Implementation Method 2
spraying the light-emitting element ink onto the target substrate at a temperature greater than or equal to a melting point of the light-emitting element solvent
Data Source
AI summary
A light-emitting element ink comprises: a light-emitting element solvent; and a plurality of light-emitting elements dispersed in the light-emitting element solvent and each comprising a plurality of semiconductor layers and an insulation film partially around the outer peripheral surfaces of the semiconductor layers, wherein the light-emitting element solvent includes a fatty acid ester-based compound having a melting point in the range of 0° C. to 15° C.