UV Curable White Ink for High-Contrast Bezel Printing
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Solution Overview
Problem
Existing methods for creating white bezels in inkjet printing are complex, time-consuming, and fail to maintain adhesion strength and color integrity under high-temperature heat treatments, lacking in simplicity and efficiency.
Innovation Solution
An ultraviolet curable white ink composition for inkjet printing, comprising a pigment dispersion, binder solution, monofunctional monomer, and photoinitiator, which allows for one-time printing of a 30 μm thick white bezel with a 98% contrast ratio, using UV curing and subsequent heat treatment to achieve improved adhesion and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If screen printing method with multiple layers is used to achieve hiding power, then the hiding power and light-shielding characteristics are improved, but the process complexity and manufacturing time increase
Solution Approach 1:
The patent combines multiple printing layers into a single inkjet printing process. The white bezel is formed by printing a white ink composition containing titanium dioxide pigment and binder in one step, eliminating the need for separate screen printing layers. This merging of multiple processes into one resolves the contradiction between achieving sufficient hiding power and reducing process complexity.
Solution Approach 2:
The patent replaces the screen printing method with inkjet printing technology. Inkjet printing allows for precise deposition of white ink in a single pass, achieving the required hiding power without the mechanical complexity of screen printing masks and multiple layer applications. This substitution of printing mechanisms resolves the contradiction between manufacturing precision and device complexity.
2Manufacturing precision
If screen printing method with multiple layers is used to achieve hiding power, then the light-shielding characteristics are improved, but the manufacturing time increases
Solution Approach 1:
The patent merges multiple printing operations into a single inkjet printing step. The white ink composition is applied in one pass to achieve the required light-shielding characteristics, eliminating the time-consuming sequential layers of screen printing. This consolidation directly addresses the contradiction between achieving sufficient light-shielding and reducing manufacturing time.
Solution Approach 2:
The inkjet printing process is designed to deposit the complete white ink composition with optimal pigment and binder ratios in advance, ensuring sufficient light-shielding characteristics are achieved from the first application. This preliminary action with properly formulated ink eliminates the need for subsequent printing passes, resolving the time efficiency contradiction.
3Ease of manufacture
If conventional white ink is used for inkjet printing, then the process is simplified, but the adhesion strength and heat resistance are insufficient
Solution Approach 1:
The patent modifies the chemical parameters of the white ink composition by selecting specific binder resins with high adhesion properties and appropriate glass transition temperatures. The ink composition includes titanium dioxide pigment combined with specially formulated binders that provide enhanced adhesion strength (≥3.0 N/25mm) and heat resistance. These parameter changes maintain process simplicity while dramatically improving reliability.
Solution Approach 2:
The patent creates a composite white ink composition combining titanium dioxide pigment particles with polymer binder resins and controlled amounts of solvents and additives. This composite material structure provides both the simplicity of inkjet printing and the enhanced adhesion strength and heat resistance required for reliable white bezel formation, resolving the contradiction between ease of manufacture and reliability.
4Ease of manufacture
If conventional white ink is used for inkjet printing, then the process is simplified, but the contrast ratio and color integrity are insufficient
Solution Approach 1:
The patent optimizes the optical parameters of the white ink by controlling pigment concentration, particle size distribution, and binder resin selection. These parameter changes ensure the white bezel achieves a contrast ratio of ≥98% while maintaining the simplicity of the inkjet printing process. The optimized composition reflects light effectively while preventing yellowing, resolving the contradiction between process simplicity and manufacturing precision.
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 solution enables the production of a white bezel pattern with enhanced adhesion strength and resistance to high-temperature yellowing, simplifying the process while maintaining desired thickness and color properties.
Implementation Method 1
forming a cured white bezel pattern by irradiating an ultraviolet ray of 1,000 mJ/cm2 or more onto the substrate
Data Source
AI summary
The present invention relates to an ultraviolet curable white ink composition for inkjet printing comprising a pigment dispersion, a binder solution, a monofunctional monomer and a photoinitiator and, more particularly, to an ultraviolet curable white ink composition for inkjet printing which, at the time of forming a pattern, has a thickness of 30 μm or less and a contrast ratio of 98% or more, a method for preparing a white bezel pattern using the same, and an electronic device comprising the white bezel pattern prepared by the method.