On the response speed of pi-cells

Direct Optical Quantification of Backflow in a90°Twisted Nematic Cell

“…5 155 Pa s. Good agreement in the backflow region ͑t , 6 ms͒ using the modified set of viscosity coefficients is now observed and is significantly better than that obtained by modeling the relaxation process with the published viscosity values. The value of ͑h 1 -h 2 ͒͞g 1 is within 10% of unity and has a value of 0.97 for the modified set of viscosity coefficients, thus agreeing with predictions based on ellipsoidal molecules [16]. In addition, the general rule derived from microscopic models [17] that for nematic liquid crystals, h 1 .…”

Response times in pi-cell liquid crystal displays

“…s, and η 12 =0.0Pa . s [7,8]. The same cell gap (3µm) is used in our simulation to compare with the various pretilt angle and voltage's effect on the response times.…”

“…The Pi-cell operates between the bend deformation at the critical voltage (Uc) and the near homeotropic state at high voltage. Many researchers [4][5][6][7][8][9][10] only studied the response times of the cell with various pretilt angles, which is switched between Uc and on-state voltage. However, the response time is sensitive with the different driven voltage and pretilt angle, but it has not analyzed in detail before.…”

P‐125: Sequential Color LCD Using No‐Bias Bend Mode

“…Previous studies clearly stated that optically compensated bend (OCB) mode liquid crystal display (LCD) is capable of fast response time [1][2][3][4][5][6]. OCB is a pi-cell which operates from bend to bend states with a critical holding voltage.…”