Light Emitting Element Solvent With Ion Removal for Precise Alignment
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Solution Overview
Problem
In the fabrication of inorganic light emitting diode display devices, the alignment of light emitting elements is disrupted by impurity ions eluted from the surface treatment of the substrate, leading to changes in physical properties of the light emitting element solvent, which affects the alignment degree and efficiency of the display device.
Innovation Solution
A light emitting element ink is developed with a solvent containing a solvent molecule and an ion remover that reacts with impurity ions, maintaining the physical properties of the solvent and ensuring precise alignment of light emitting elements through an electric field, using a composition that includes specific molecular formulas and a silyl group to form complexes with impurity ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fluorine treatment is applied to the substrate surface to enable smooth ink deposition, then the ink can be smoothly seated on the substrate, but fluorine ions are eluted into the ink causing changes in electrical conductivity and lowering electric field reactivity
Solution Approach 1:
The patent introduces an intermediary substance (ion remover or ion scavenger) into the ink composition that mediates between the fluorine-treated substrate surface and the light emitting elements. This intermediary selectively binds to eluted fluorine ions, preventing them from interfering with the electrical properties of the ink and the alignment process, thus resolving the contradiction between smooth deposition and alignment precision
Solution Approach 2:
The patent extracts the harmful fluorine ions from the ink system by incorporating ion removers that selectively bind and remove these ions. This extraction process eliminates the source of electrical conductivity changes and electric field reactivity reduction, allowing the ink to maintain its designed properties while still benefiting from fluorine treatment for smooth deposition
2Stability of the object's composition
If ion removers are added to the solvent to remove impurity ions, then the physical properties of the solvent are maintained, but the composition complexity increases
Solution Approach 1:
The patent carefully controls the concentration parameters of ion removers in the ink, maintaining them at low levels (0.01-5 wt%) to remove impurity ions while minimizing impact on overall ink composition and processing characteristics. This parameter optimization allows maintenance of solvent physical properties without excessive complexity
Solution Approach 2:
The patent creates a composite ink composition that integrates multiple functional components (solvent, ion remover, light emitting elements, surfactants) into a unified system. The ion remover is selected and combined with other components to ensure compatibility and synergistic effects, managing composition complexity through thoughtful material integration
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 ion remover effectively prevents changes in the solvent's physical properties, maintaining the designed viscosity, dielectric constant, and electrical conductivity, thereby improving the alignment degree and reliability of the light emitting elements on the electrodes, ensuring consistent performance in the display device fabrication process.
Implementation Method 1
an ion remover capable of removing ions that may be eluted from a surface-treated surface
Implementation Method 2
The light emitting elements may be jetted onto the electrodes in a state in which they are dispersed in a solvent, and may be seated (e.g., deposited) on the electrodes while their positions and orientation directions are changed by an electric field generated on (or at) the electrodes
Data Source
AI summary
A light emitting element solvent and method of fabricating a display device are provided. The light emitting element solvent includes a light emitting element solvent, and light emitting elements dispersed in the light emitting element solvent and each including a plurality of semiconductor layers and an insulating film surrounding outer surfaces of the semiconductor layers, wherein the light emitting element solvent includes a solvent molecule represented by Formula 1 and an ion remover represented by Formula 2.