Color Filter Composition Using Sensitizing Dye for Exposure Sensitivity
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Solution Overview
Problem
Color filters in image sensing devices and flat panel displays face defects due to poor sensitivity to exposure, leading to undercut peripheries and reduced transmittance, which can be costly to address with increased initiator concentrations.
Innovation Solution
A color filter composition incorporating a pigment or dye, a binder resin, an ultraviolet-absorbing initiator, and an assistance colorant with high transmittance in the short wavelength region (300-400 nm), such as a yellow azo-based or anthraquinone-based material, to enhance exposure sensitivity and reduce defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the concentration of the initiator is increased to increase exposure sensitivity, then the sensitivity to exposure is improved, but the manufacturing cost increases and transmittance is reduced
Solution Approach 1:
The patent introduces a sensitizing dye as an intermediary substance that absorbs UV light and transfers energy to the initiator, enabling the initiator to work more efficiently at lower concentrations. This mediator (sensitizing dye) bridges the gap between UV light and the initiator, allowing improved exposure sensitivity without increasing initiator concentration, thereby avoiding increased manufacturing costs and transmittance reduction.
Solution Approach 2:
The patent changes the optical parameters of the composition by adding a sensitizing dye with specific absorption characteristics in the UV region (300-400 nm). This parameter change allows the system to achieve better exposure sensitivity through optical enhancement rather than increasing chemical initiator concentration, thus avoiding the associated costs and transmittance issues.
2Reliability
If the concentration of the initiator is increased to increase exposure sensitivity, then the sensitivity to exposure is improved, but the transmittance is reduced
Solution Approach 1:
The sensitizing dye acts as a mediator that absorbs UV light at wavelengths where the initiator has low absorption, and then transfers energy to the initiator. This allows the initiator to remain at low concentration (maintaining high transmittance) while still achieving high exposure sensitivity through the sensitizing dye's optical mediation.
Solution Approach 2:
The patent modifies the spectral absorption parameters of the composition by introducing a sensitizing dye with strong UV absorption (300-400 nm). This parameter change enables the system to achieve high exposure sensitivity through optical absorption enhancement rather than increasing initiator concentration, thereby maintaining high transmittance.
3Ease of manufacture
If a resin composition has poor sensitivity to exposure, then manufacturing cost is reduced, but undercut defects are generated due to depth-dependent variation in photohardening rate
Solution Approach 1:
The sensitizing dye serves as an intermediary that uniformly distributes UV light absorption throughout the coating depth. By absorbing UV light and transferring energy to initiators at various depths, it ensures uniform photohardening rate from surface to substrate interface, preventing undercut defects while maintaining cost-effective initiator concentrations.
Solution Approach 2:
The patent changes the depth-dependent light absorption parameter by introducing a sensitizing dye with strong UV absorption. This creates more uniform energy distribution through the coating depth, resulting in uniform photohardening rate and eliminating undercut defects without requiring excessive initiator concentration.
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 assistance colorant with high transmittance in the short wavelength region improves the sensitivity and uniformity of the color filter photoresist, reducing undercut defects and allowing for deeper exposure, thus enhancing the photohardening process and reducing manufacturing costs.
Implementation Method 1
the initiator absorbs light of an ultraviolet wavelength
Implementation Method 2
the assistance colorant has transmittance of more than about 60% in a short wavelength region
Data Source
AI summary
A color filter composition is provided. The color filter composition according to an exemplary embodiment includes a colorant A including a pigment or a dye, a binder resin B, an initiator C, and an assistance colorant D, wherein the initiator absorbs light of an ultraviolet wavelength, and the assistance colorant has a transmittance of more than 60% between about wavelengths 300 nm to 400 nm.