Black Matrix Ink for Offset Printing Substrate
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Solution Overview
Problem
The production of liquid crystal display devices is hindered by the need for multiple mask processes, which increase production costs and time.
Innovation Solution
An ink for forming a black matrix using an off-set printing device, comprising an organic pigment, binder, thermally cross-linkable monomer, high-boiling point printing solvent, low-boiling point carrier solvent, and additive, allowing for the formation of a black matrix without the need for mask processes through off-set printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple mask processes are used to form the black matrix, then the black matrix can be formed with good pattern precision, but the production time and cost increase significantly
Solution Approach 1:
The patent extracts the black matrix formation process from the conventional mask process sequence. By using a printing method that directly deposits black matrix material in the desired lattice pattern, the complex multi-step mask process (photoresist coating, exposure, development, etching, stripping) is replaced with a single printing and drying step, eliminating the need for photoresist and etching chemicals while maintaining pattern precision
Solution Approach 2:
The patent uses a printing plate with a predetermined lattice pattern to copy the black matrix structure directly onto the substrate. The printing plate acts as a master template that transfers the black matrix pattern through material deposition, replacing the photomask copying process and enabling direct formation of the black matrix without requiring photoresist patterns
2Manufacturing precision
If multiple mask processes are used to form the black matrix, then the black matrix pattern can be precisely controlled, but the production cost increases
Solution Approach 1:
The patent removes the expensive photoresist materials, exposure equipment, and etching chemicals from the manufacturing process. By using a direct printing method with black matrix-forming ink, the process eliminates multiple material layers and chemical processing steps, significantly reducing material costs and equipment requirements while maintaining pattern precision through the printing plate
Solution Approach 2:
The patent employs a disposable printing plate that can be easily replaced when worn or damaged. This simple, low-cost printing plate replaces expensive photomasks and photoresist systems. The printing plate can be a simple stencil or template that is discarded after limited use, eliminating the need for costly photomask fabrication and alignment systems
3Ease of operation
If conventional ink formulations are used for black matrix formation, then the ink can be easily applied, but the ink remains soluble and affects subsequent color filter formation
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by incorporating crosslinking agents and reactive monomers alongside the black pigment and solvent. This transforms the ink from a simple suspension into a chemically active formulation that undergoes polymerization upon exposure to UV light or heat, changing from a soluble state to an insoluble crosslinked network that resists subsequent processing
Solution Approach 2:
The patent utilizes a phase transition in the ink's chemical state through crosslinking. The ink starts as a fluid solution that can be easily printed and deposited, then undergoes a chemical phase transition when exposed to UV light or heat, transforming from a soluble liquid state to an insoluble solid crosslinked polymer network. This phase change ensures the black matrix remains stable during subsequent color filter formation processes
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
This method reduces production costs and time while improving efficiency by eliminating the need for mask processes, enabling the stable formation of a black matrix with a lattice pattern on the substrate.
Implementation Method 1
a thermally cross-linkable monomer
Implementation Method 2
a thermally cross-linkable monomer
Implementation Method 3
a printing solvent that has a boiling point equal to or more than 100 degrees Celsius; a carrier solvent that has a boiling point less than 100 degrees Celsius
Data Source
AI summary
An ink used to form a black matrix on a substrate using an off-set printing device, wherein the off-set printing device includes a stage on which the substrate is placed, a printing roll which is covered by a blanket, and a cliché which includes a concave portion and a convex portion, the ink includes: an organic pigment; a binder; a thermally cross-linkable monomer; a printing solvent that has a boiling point equal to or more than 100 degrees Celsius; a carrier solvent that has a boiling point less than 100 degrees Celsius; and an additive.