Color Filter Composition Single-Layer Process Cost Reduction
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Solution Overview
Problem
The existing methods for forming color filters require repeated heat treatment processes, which increase costs and limit the use of heat-sensitive dyes with high transparency, as they cannot withstand multiple heating cycles.
Innovation Solution
A colorant composition comprising a first and second color material with specific transmittance ranges at various wavelengths, allowing for the formation of a color filter that reduces process costs and enables the realization of red and blue colors with a single filter layer, using a photosensitive resin composition that includes these color materials along with additional components like binder resins and solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated heat treatment processes are used to form color filters, then the color filter can be formed with good adhesion and curing, but the process cost increases and heat-sensitive dyes with high transparency cannot be used
Solution Approach 1:
The patent combines multiple color materials (first color material absorbing green light, second color material absorbing red light) into a single photosensitive resin composition that can be applied in one coating process. This merging of color filtering functions into one layer eliminates the need for repeated heat treatment processes, reducing both cost and thermal exposure while maintaining color filter formation quality.
Solution Approach 2:
The patent changes the chemical composition parameters of the photosensitive resin by selecting specific color materials with defined absorption characteristics and transmittance ranges. The first color material has transmittance of 60% or less at 530nm and 90% or more at 620nm, while the second color material has transmittance of 60% or less at 600nm and 90% or more at 480nm. These parameter specifications enable single-coat formation with reduced heat treatment requirements.
2Reliability
If repeated heat treatment processes are used to form color filters, then the color filter can be formed with good adhesion and curing, but heat-sensitive dyes with high transparency cannot be used
Solution Approach 1:
The patent merges multiple color filtering functions into a single photosensitive resin composition containing both first and second color materials. This approach eliminates repeated heat treatment, thereby enabling the use of heat-sensitive dyes that would otherwise degrade under multiple heating cycles, thus expanding dye selection range while maintaining formation quality.
Solution Approach 2:
The patent creates a composite photosensitive resin composition combining color materials with specific absorption and transmittance characteristics. The composite structure integrates first color material (absorbing green, transmitting red) and second color material (absorbing red, transmitting green), enabling versatile dye selection including heat-sensitive options while achieving desired color filtering performance in a single layer.
3Ease of manufacture
If multiple color materials are combined in one photosensitive resin composition, then the transmittance is excellent and process cost is reduced, but the composition complexity increases
Solution Approach 1:
The patent manages composition complexity by precisely defining transmittance parameters for each color material. The first color material has transmittance of 60% or less at 530nm and 90% or more at 620nm; the second color material has transmittance of 60% or less at 600nm and 90% or more at 480nm. These clear parameter specifications simplify formulation despite multiple components, enabling cost reduction through single-coat application.
Solution Approach 2:
The patent applies local quality by assigning specific optical functions to specific color materials within the composite. The first color material is optimized for absorbing green light while transmitting red, and the second color material is optimized for absorbing red light while transmitting green. This functional differentiation achieves excellent spectral transmittance characteristics without requiring complex overall composition design.
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 achieves excellent transmittance and reduces process costs by allowing the formation of a color filter that can express both red and blue colors with a single coating, utilizing color materials with high transmittance and heat stability.
Implementation Method 1
the coating film is irradiated with ultraviolet rays by a negative mask for forming a desired image to cure an exposed portion
Implementation Method 2
the first color material and the second color material each have a transmittance of 60% or less at a wavelength of 490 nm or more and 605 nm or less, a transmittance of 90% or more at a wavelength of 470 nm or less, and a transmittance of 98% or more at a wavelength of 620 nm or more
Data Source
AI summary
The present invention relates to a colorant composition including a first color material and a second color material, in which the first color material and the second color material each have a transmittance of 60% or less at a wavelength of 490 nm or more and 605 nm or less, a transmittance of 90% or more at a wavelength of 470 nm or less, and a transmittance of 98% or more at a wavelength of 620 nm or more.