Curable Resin Composition with Upconversion for Uniform Filter Curing
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Solution Overview
Problem
During the curing process of a color filter layer in display devices, the bottom of the filter often experiences low curing rates due to light absorption by coloring agents, leading to significant undercuts and reduced luminous efficiency.
Innovation Solution
A curable resin composition incorporating upconversion particles that absorb near-infrared light and emit ultraviolet light is used, enabling effective curing throughout the entire thickness of the filter, including the bottom, by converting infrared light to ultraviolet light for photocuring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photocuring is used to form a color filter layer, then the coloring agent provides the desired color function, but the curing rate at the bottom of the filter is very low due to light absorption
Solution Approach 1:
The patent introduces an upconversion particle as an intermediary substance that absorbs near-infrared light and converts it to ultraviolet light. This UV light then acts as the actual curing agent for the photocurable resin, bypassing the problem of visible light absorption by the coloring agent. The upconversion particle mediates between the infrared light source and the photocurable resin, enabling effective curing throughout the filter thickness.
Solution Approach 2:
The patent changes the wavelength parameter of the curing light from the visible range (which is absorbed by coloring agents) to the ultraviolet range (which can penetrate the coloring agent). By using upconversion particles to convert near-infrared light to UV light, the curing process operates at a different spectral parameter where the coloring agent does not interfere, thereby achieving uniform curing throughout the filter.
2Length of stationary object
If the filter thickness is increased to improve optical performance, then the optical function is enhanced, but the undercut becomes more significant due to low curing rate at the bottom
Solution Approach 1:
The upconversion particle serves as a mediator that enables deep penetration of curing energy into thicker filter structures. By converting infrared light to UV light within the filter matrix, the curing radiation can reach and cure resin at the bottom of thicker filters, preventing the formation of large undercuts that would otherwise occur in thick sections.
Solution Approach 2:
The patent converts the harmful effect of light absorption (which normally prevents curing at depth) into a beneficial upconversion process. The upconversion particles absorb the infrared light that would otherwise pass through without effect, and re-emit it as UV light that actively cures the resin, thereby turning the absorption problem into a curing solution for thick filters.
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 approach enhances curing rates across the entire filter thickness, reducing undercuts and improving luminous efficiency of the display device.
Implementation Method 1
one or more particles to absorb light in the near-infrared region and to emit light in the ultraviolet region
Implementation Method 2
a photoinitiator
Data Source
AI summary
A curable resin composition for a color filter of a display device includes, among other things: a coloring agent; and a photoinitiator; and further includes one or more particles configured to absorb light in the near-infrared region of light and configured to emit light in the ultraviolet region of light.