Dependence of SSFLC electrooptic switching characteristics and matrix addressing capabilities on cell materials was investigated. Four test cells were made with two FLC mixtures, ZLI 4851-000 and BDH SCE8, in combination with two alignment materials, rubbed polymide (Nissan SE3140) and friction deposited teflon. The cells show a good bistability characterized by memory and symmetric switching. Delay and rise times have been measured and fitted using a uniform director model, allowing a determination of all parameters within this model. Based on this, computed region of operation of normal and fast addressing modes are reported. For both mixtures, teflon aligned cells, compared to polymide aligned cells, show higher elastic restoring torque in the model. For normal addressing modes, teflon cells feature a higher minimum and a lower maximum operating voltage. Furthermore, they allow higher addressing speeds for both normal and fast models.
Influence of alignment techniques on switching behaviour of SSFLC cells / D'Alessandro, Antonio; Ferrara, Vincenzo; Campoli, F.; Maltese, Paolo; Matuszczyk, T.; Matuszczyk, M.; Lagerwall, S. T.. - 3318:(1998), pp. 98-102. (Intervento presentato al convegno Liquid Crystals: Physics, Technology, and Applications tenutosi a Zakopane, Polonia nel 3-8 March 1997) [10.1117/12.299946].
Influence of alignment techniques on switching behaviour of SSFLC cells
D'ALESSANDRO, Antonio;FERRARA, Vincenzo;MALTESE, Paolo;
1998
Abstract
Dependence of SSFLC electrooptic switching characteristics and matrix addressing capabilities on cell materials was investigated. Four test cells were made with two FLC mixtures, ZLI 4851-000 and BDH SCE8, in combination with two alignment materials, rubbed polymide (Nissan SE3140) and friction deposited teflon. The cells show a good bistability characterized by memory and symmetric switching. Delay and rise times have been measured and fitted using a uniform director model, allowing a determination of all parameters within this model. Based on this, computed region of operation of normal and fast addressing modes are reported. For both mixtures, teflon aligned cells, compared to polymide aligned cells, show higher elastic restoring torque in the model. For normal addressing modes, teflon cells feature a higher minimum and a lower maximum operating voltage. Furthermore, they allow higher addressing speeds for both normal and fast models.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
