Core-Shell Green Dye for Fine CMOS Color Filter Patterning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing color filters for CMOS image sensors face challenges in forming fine patterns due to limitations in particle size and chemical resistance of pigments, leading to issues with film-thinning and processability, especially in manufacturing smaller pixels.
Innovation Solution
A core-shell compound is introduced, comprising a core represented by Chemical Formula 1 and a shell represented by Chemical Formula 2, which includes long-chain alkyl or cycloalkyl groups, providing excellent chemical resistance and suitable for use as a green dye in a photosensitive resin composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pigment-based color filters are used, then chemical resistance is improved, but manufacturing precision deteriorates due to particle size limitations
Solution Approach 1:
The invention uses a core-shell compound where the core contains the coloring moiety (squarylium, cyanine, or xanthene dye) and the shell contains the polymer backbone. This composite structure allows the coloring portion to provide excellent chemical resistance while the polymer shell enables fine pattern formation, resolving the contradiction between chemical resistance and manufacturing precision
Solution Approach 2:
The color filter material is segmented into distinct functional components: the core (coloring portion) and the shell (polymer portion). This segmentation allows each component to independently fulfill its function - the core provides chemical resistance through its stable dye structure while the shell provides pattern formation capability through its polymer properties
2Productivity
If film thickness is reduced for smaller pixels, then productivity is improved, but chemical resistance deteriorates
Solution Approach 1:
The core-shell compound structure allows the coloring portion to be highly concentrated in the core region, providing sufficient chemical resistance even in thin films. The polymer shell provides structural integrity and pattern definition, enabling the overall film to be made thinner for smaller pixels while maintaining adequate chemical resistance
3Manufacturing precision
If pigment particle size is reduced for fine patterns, then manufacturing precision is improved, but chemical resistance deteriorates
Solution Approach 1:
The invention transitions from discrete pigment particles to a molecular-level composite where the coloring moiety is integrated into the core-shell structure. The core contains the dye molecules that provide chemical resistance, while the polymer shell enables fine pattern formation. This composite approach eliminates the trade-off between particle size and chemical resistance that plagues traditional pigment systems
Data Source
AI summary
A core-shell compound, a photosensitive resin composition including the same, a photosensitive resin layer manufactured using the photosensitive resin composition, a color filter including the photosensitive resin layer, and a CMOS image sensor including the color filter, the core-shell compound including a core represented by Chemical Formula 1 and a shell surrounding the core, the shell being represented by Chemical Formula 2: