Studies on High Optical Density Black Matrix of Color Filter
Date Issued
2004
Date
2004
Author(s)
Chen, Wei-Yuan
DOI
zh-TW
Abstract
In the present research the relationship between the interaction distance and the particle size of carbon blacks was established by using the Hansen model. With this relationship suitable liquids can be chosen for dispersion of carbon blacks. In addition, polymer grafting on carbon blacks was performed to obtain more uniform dispersion in UV-curable resins, so that thin film black matrix can be fabricated.
First, with the solubility parameters of dispersion liquids and carbon blacks, the interaction forces between them could be estimated with the Hansen model. Besides, the particle size of carbon blacks was measured by using light scattering. The relationship between the particle size of carbon blacks and the interaction distance could then be established. The results indicated that good correlation between them could obtained, and the smaller the interaction distance, the better the dispersion of carbon blacks and the smaller the particle size.
The modified carbon blacks were then dispersed in the cosolvent of DMF (good dispersion liquid) and PGMEA (poor dispersion liquid). By adjusting the composition of the cosolvent, the particle size of the modified carbon blacks could be tailored. In addition, modification on the dispersed carbon blacks was performed with grafting of monomer (MAA) and copolymer (PMMA-co-MAA) by the initiator BPO, and grafting of living polymer (PSt-T). The modified carbon blacks were separated from the liquid by centrifuge and the amount of grafting was estimated. The modified carbon blacks were further mixed with epoxyacrylate resins to form black matrix resins, which were then spin-coated on glass substrate to form thin film. After baking and UV-curing, thin film black matrix was obtained. The dispersion of carbon blacks in the matrix was investigated by AFM. The results indicated that ultra-thin black matrix could be successfully fabricated with the method discussed above.
Subjects
UV可硬化樹脂
碳黑
Hansen model
黑色矩陣
Carbon Black
UV curable resin
Blac
Type
thesis
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