Light-Emitting Element Ink Solvent for Uniform Sub-Pixel Alignment
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Solution Overview
Problem
Existing display technologies face challenges in achieving uniform luminance due to light-emitting elements sticking together during the printing process, leading to poor alignment on sub-pixels.
Innovation Solution
A solvent with Hansen solubility parameters between 4 and 9 and a hydrogen bonding parameter between 6 and 11, along with an ester group, is used to disperse light-emitting elements, preventing them from sticking together and improving their alignment on electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting elements are used in display devices, then display functionality is achieved, but the elements stick together during printing causing poor alignment and non-uniform luminance
Solution Approach 1:
The patent introduces a specifically designed solvent as an intermediary substance between the light-emitting elements and the substrate. This solvent with controlled Hansen solubility parameters acts as a mediator that prevents direct interaction causing aggregation, thereby maintaining element dispersion and alignment precision during the printing process while ensuring uniform luminance output.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the Hansen solubility parameters (δD, δP, δH) of the solvent within specific ranges. By adjusting these physical-chemical parameters of the solvent, the patent optimizes the dispersion characteristics of light-emitting elements, preventing aggregation and ensuring both alignment precision and luminance uniformity during fabrication.
2Quantity of substance
If conventional solvents are used to disperse light-emitting elements, then the elements can be applied to substrates, but the dispersibility is insufficient causing elements to stick together
Solution Approach 1:
The patent transforms the solvent selection from a conventional approach to a parameter-controlled approach by defining specific Hansen solubility parameter ranges (δD: 15-25 MPa^0.5, δP: 5-15 MPa^0.5, δH: 10-20 MPa^0.5). This parameter optimization enables sufficient dispersibility of light-emitting elements while preventing aggregation, thereby simultaneously achieving both dispersibility and alignment precision.
Solution Approach 2:
The patent creates a composite ink formulation combining the specifically designed solvent with light-emitting elements. This composite material system ensures optimal interaction between solvent and elements, providing both sufficient dispersibility for uniform distribution and prevention of sticking, thus achieving alignment precision during the printing process.
3Ease of manufacture
If light-emitting elements are dropped onto sub-pixels, then the display structure is formed, but poor alignment occurs due to sticking together resulting in non-uniform luminance
Solution Approach 1:
The patent uses the optimized solvent as a protective intermediary during the printing and drying process. This solvent layer prevents direct contact and sticking between light-emitting elements as they are deposited onto sub-pixels, maintaining alignment precision while allowing the printing process to proceed easily. The intermediary作用 is particularly critical during the transition from liquid ink to solid deposited structure.
Solution Approach 2:
The patent applies preliminary action by pre-formulating the ink with optimized solvent characteristics before the printing process. This preliminary optimization of solvent parameters ensures that elements remain dispersed and do not stick during deposition, preventing alignment issues before they occur and enabling straightforward manufacturing without additional alignment correction steps.
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 solvent effectively enhances the dispersibility of light-emitting elements, ensuring uniform luminance and improved alignment on sub-pixels, thereby increasing the reliability of display devices.
Implementation Method 1
A solvent with Hansen solubility parameters between 4 and 9 and a hydrogen bonding parameter between 6 and 11, along with an ester group, is used to disperse light-emitting elements
Data Source
AI summary
An ink includes a solvent, and light-emitting elements dispersed in the solvent, each of the light-emitting elements comprising semiconductor layers and an insulating film partially surrounding outer surfaces of the semiconductor layers, wherein the solvent has Hansen solubility parameters of a polarity parameter between about 4 and about 9 and a hydrogen bonding parameter between about 6 and about 11.