Color shift free newly two-domain fringe-field switching mode

The fringe-field switching (FFS) mode is a representative mode exhibiting both a wide viewing angle and high transmittance due to the in-plane rotation of the liquid crystal (LC) director. However, it shows a color shift in off-normal directions, especially along perpendicular and parallel to the director in the on state, since the LC director only rotates in one direction. To solve this problem, we suggested a new cell structure with pixel electrodes which remain in a 90° rotational symmetry. This structure allows the LCs existing in the top and bottoms halves in the center of a pixel to remain in a 90° rotational symmetry from the off state to the on state. As a result, the light that passes through the long axis of the LC in an oblique direction passes through the short axis of the LC director, and the color shift is minimized due to the ideal self-compensation. Therefore, it shows good color gamut characteristics across its range, irrespective of the applied voltage in the wide viewing directions.