Performance characteristics of nematic liquid crystal display devices

Electrochemistry of Nematic Liquid Crystals

“…Tr~e ~ R/1~ [4] in agreement with the experimental results (9,10). An intriguing aspect of nematic liquid crystals is that they can sustain direct current excitation for over 1000 hr before failure.…”

Nematic Liquid Crystals: Applications, Section 3.3

“…Hence an AC field is preferred. It is found that an AC field enhances the life of the display almost >50 times compared to that of a DC field [60]. Dynamic scattering mode displays can be operated at any frequency below the cut-off frequency.…”

“…These workers have also found that there are three types of turbulent flow: DSM-like, DSM1, and DSM2 [57-591. Figure 7 shows the threshold characteristic of a dynamic scattering mode display for a material (N-014) for various cell gaps (6-127 pm) [60]. With increasing voltage above the threshold v t h d , the transmission drops and scattering increases.…”

“…The minimum current density should be about 0.1-0.5 pA/cm2 for the scattering to occur. Figure 8 shows the current density ( j ) vs. the applied voltage (V) for N-014 at 25°C for the cells with cell gaps ranging from 6-127 pm [60]. Only a small deviation from ohmic behavior is observed.…”

Introduction to Liquid Crystals

“…92 ,105 Measurements show that the threshold voltage and contrast ratio in dynamic scattering devices are almost completely insensitive to temperature throughout the nematic range. 78 The conductivity in nematics is governed by ionic equilibrium 106 and is inversely proportional to the viscosity and square root of the dissociation constant. Both the viscosity and equilibrium constant are exponentially dependent on temperature as is the conductivity.…”