We introduce a twisted-nematic LC cell, which can rotate the polarization angle of the polychromatic light. We used interdigitated electrodes to apply an in-plane field to control the twist angle. Thanks to the asymmetrical anchoring in the LC cell, the twist angle could be rotated continuously by increasing the applied electric field. The linearly polarized light incident on the LC cell can be rotated following the twist direction. Since it does not require an additional retardation film such as QWP, there is no degradation of the performance at a specific wavelength even for the polychromatic light.
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