Optical Properties of Color Filters for Liquid Crystal Displays

Abstract

Liquid crystal displays LCD have become used widely recently. Color filter CF is obviously one of the key components of those. High contrast ratio of LCD is still demanding. Deterioration of contrast ratio has been pointed out to be caused by the leakage light of CF set between the crossed Nicols polarizers. Adding organic pigment in vehicle and dispersed with Zirconia bead of different diameter, photoresist of CF with different mechanical dispersion intensity level was made. CF was made by coating photoresist on glass substrate and dried. Optical properties of CF samples with different mechanical dispersion levels were measured and the degree of depolarization of those was investigated. We revealed that increasing mechanical dispersion level in manufacturing process of photoresist decreased the degree of depolarization, which increased the contrast ratio.