Inkjet Chamber Bump Layout for Uniform Nanoparticle Discharge
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Solution Overview
Problem
Inkjet printing processes for forming light control patterns in display devices often result in defects due to non-uniform concentration of nanoparticles, leading to visible stains and imperfections.
Innovation Solution
An inkjet printing device with a chamber design featuring a centerline and bump portions on its inner surface, along with uniform concentration control of nanoparticles, ensures consistent ink discharge through multiple nozzles, preventing defects in light control patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid ink with nanoparticles is sprayed through inkjet nozzles, then light control patterns are formed, but non-uniform concentration of nanoparticles causes visible stains and defects
Solution Approach 1:
The patent applies local quality by creating a bump portion at a specific location within the chamber - farther from the centerline than the outer column nozzles. This localized structural modification alters the flow dynamics specifically in that region, enabling uniform nanoparticle distribution across all nozzles without affecting the entire chamber design. The bump portion locally modifies the ink flow path to prevent concentration variations.
Solution Approach 2:
The patent changes the physical parameter of the chamber structure by introducing a bump portion with specific geometric characteristics (disposed farther from the centerline than the outer column nozzles). This structural parameter change modifies the flow field and pressure distribution within the chamber, resulting in uniform nanoparticle concentration at all nozzle outlets, thereby eliminating stains and defects.
2Area of stationary object
If inkjet nozzles are arranged in multiple columns including center and outer columns, then coverage area is increased, but concentration uniformity across nozzles becomes difficult to maintain
Solution Approach 1:
The patent uses local quality by positioning a bump portion specifically farther from the centerline than the outer column nozzles. This localized feature creates appropriate flow resistance or redirection in that specific region, compensating for the positional differences between center and outer nozzles. As a result, all nozzles receive ink with uniform nanoparticle concentration despite their different locations, maintaining composition stability while achieving broad coverage.
Solution Approach 2:
The patent applies asymmetry by introducing a bump portion that is not symmetrically positioned relative to the chamber centerline - specifically, it is disposed farther from the centerline than the outer column nozzles. This asymmetric structural feature creates non-uniform flow modification that compensates for the asymmetric arrangement of nozzles, ensuring uniform nanoparticle distribution across all columns while maintaining the multi-column configuration for extended coverage.
Data Source
AI summary
An inkjet printing device includes a chamber having an imaginary centerline that divides a length of the chamber in the first direction into two halves, and a plurality of inkjet nozzles coupled to the chamber and receiving ink from the chamber, the inkjet nozzles being arranged in a plurality of columns along a first direction. The inkjet nozzles include a center column nozzle disposed adjacent to the centerline of the chamber and an outer column nozzle disposed farther from the centerline than the center column nozzle. The chamber includes a bump portion disposed farther from the centerline than the outer column nozzle, the bump portion including a bump on an inner surface of the chamber.