Synthesis of tricyanopyrrolidone derivatives as synergists for improving contrast ratio of liquid crystal displays

• Three tricyanopyrrolidone derivatives as synergists were synthesized for improving contrast ratio of LCD color filters.
• The polymeric binders were synthesized for preparing color filter photo resists.
• Color filter photo resists were prepared using the synergists and examined contrast ratio.
• Physical properties such as color and dispersion of the synergists were evaluated.
• The relationship between chemical structure and contrast ratio were analyzed and discussed.

The contrast ratio is an important color property of liquid crystal displays. Color properties are classified as colors' purity, contrast ratio, and brightness; these mainly depend on pigment properties. The contrast ratio in particular can be improved by minimizing the light scattering of pigment particles, which is directly related to their degree of dispersion. Therefore, synergists are usually employed to increase the contrast ratio by augmenting the dispersion efficiency. In this study, tricyanopyrrolidone derivatives as blue color synergists were synthesized and examined for their performance to improve the contrast ratio of liquid crystal displays. The results of this study prove that tricyanopyrrolidone derivatives as synergists for blue pigment effectively improve the contrast ratio.

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