Accurate Modeling of the Dynamics of TN Devices with Flow

• Published in: SID International Symposium Digest of technical papers Vol. 29; no. 1; pp. 985 - 988
• Main Authors: Jamal, Syed H., Kelly, Jack R.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01-05-1998
• ISSN: 0097-966X; 2168-0159
• DOI: 10.1889/1.1833930

We have modeled the switching behavior of a TN cell using the one dimensional Ericksen‐Leslie equations of nematodynamics. We compare the modeling results with experimental data on the luminance versus time of a normally white twisted nematic (NWTN) cell. Excellent agreement between experiment and model is achieved at all voltages and viewing angles. To achieve this agreement, only two viscosity parameters are required; these are combinations of the Leslie viscosity coefficients, namely γ1(i.e. α3)−α2 and α4)+α5. These parameters are easily determined from dynamic optical measurements of a TN cell.
With an adaptive time step, the equations can be solved on a time scale that makes interactive computing possible. Combined accuracy and speed make the model useful as a device design tool. For example, liquid crystal response to different active addressing schemes could be accurately modeled, eliminating the need for costly and time consuming testbedding of different schemes.