Electro Optical Characteristics of High-Pretilt Twisted Liquid Crystal pi-Cells

We studied the transformation between the twist state and bend state of a twist-stabilized optical compensated bend (TOCB) nematic liquid crystal cell. The theoretical calculation results show that when driving the TOCB cell, the bend-to-twist transition results in an optical bounce in the optical transmittance. To eliminate the optical bounce, the substrate pretilt angle should be larger than a critical value (26°). The TOCB cell with a critical pretilt angle of about 26° does not require a warm-up voltage, but achieves high transmittance, fast response, and a wide viewing angle.