34.2: Electro‐Optical Response of Compensated Helix Ferroelectric: Continuous Gray Scale, Fastest Response and Lowest Control Voltage Demonstrated to Date

Abstract

Electrooptical response of display cells with helix-free FLC is considered at high frequencies of the electric field. The light modulation frequency 3.5 kHz at  1.5 V and the response time 35μs are achieved due to the soliton mode of FLC director reorientation.

Optical response of helix‐free FLC: Continuous gray scale, fastest response, and lowest control voltage

“…Third, FLC speed ability increases in the soliton mode: the optical response time decreased to 30 µs at the light modulation frequency 5 kHz and to 24 µs at the modulation frequency 7 kHz, compared with 35 µs at the frequency 3.5 kHz( and Fig. ) for HF‐32B at the same control voltage ±1.5 V.…”

P.84: Increasing the Light Modulation Frequency Due to the Increase of FLC Viscosity

“…they shows the continuous gray scale, lack of hysteresis and lack of temperature dependence of the optical response time in rather wide temperature interval (see [3]). …”

“…First, the value of the frequency, up to which the viscosity of this material can be considered rotational (optical response time does not almost depend on frequency) reduces to 50 Hz, while it was 70 Hz for the composition HF-32B (Figure 2). Second, the interval in which the dominant dissipative factor is the shear viscosity extended from 100 Hz to 7 kHz, while for the composition HF-32B the maximal frequency was of 3.5 kHz ( [3] and Figure 4). Third, FLC speed ability increases in the soliton mode: the optical response time decreased to 30s at the light modulation frequency 5 kHz and to 24 s at the modulation frequency 7 kHz, compared with 35 s at the frequency 3.5 kHz ( [3] and Figure 4) for HF-32B at the same control voltage ± 1.5 V.…”

“…Recently in CHF based electrooptical cell in the soliton mode of director reorientation at the control voltage of ± 1.5 volts we have obtained the optical response time of about 35 μs and the light modulation frequency of 3.5 kHz with continuous gray scale and hysteresis lack [3].…”

Paper No 9.1: Unique Parameters of Display Cells Based on New FLC, and Prospects of Their Applications (Invited Paper)

“…Today researchers are solving probably the most difficult and important task of obtaining the hysteresis-free grayscale modulation characteristics at simultaneous maintaining the high rate (in kHz range) and radical reducing the values of control voltage and power consumption [6][7][8][9][10][11]. All this opens a possibility to create FLC based displays of new generation with unique parameters and functional properties.…”