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The polarity effects of dielectric anisotropy on the electro-optical characteristics of a twisted nematic mode driven by a fringe electric field that has wide viewing angle characteristics was the focus of this study. The device used in this study was designed to be a normally black mode between parallel polarizers. The perfect polarization conversion of the incident light, which passed through a polarizer, was achieved when it passed through a twisted Liquid Crystal (LC) layer. When an electric field was applied, the LC molecules with a positive (or negative) dielectric anisotropy rotated parallel (or perpendicular) to the horizontal component of a fringe electric field as the transmittance increased. According to the calculated results, an enhanced transmittance of the Fringe Field-Twisted Nematic (FF-TN) mode with a positive dielectric anisotropy of + 8.2 was be obtained.