This work proposes a viewing angle switching (VAS) panel using twisted-nematic liquid-crystals (TN-LCs). A large difference in the twisted angle and the phase retardation from different directions results in a large optically anisotropic behavior of a TN-LC layer. The proposed VAS panel is developed using this large optically anisotropic behavior of a TN-LC layer. Optical films are also used in the proposed VAS panel to enhance the optical anisotropy of a TN-LC layer. With the proposed panel, a display is only perceived clearly at a downward direction in a narrow viewing angle mode to ensure high privacy protection. Additionally, the proposed VAS panel achieves a high transmittance of 95%, making it highly promising for mobile device applications.
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