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Temporal electrical response of chiral smectic liquid crystal displays with V/W-shaped electrooptical characteristic

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Pena J. M. S. , Pérez I. , Urruchi J. , Torres J. C. , Otón J. M.

Opto-Electronics Review

2008

tom Vol. 16, No. 2

189-193

Chiral smectic liquid crystal cells showing V-shaped electrooptical switching have been reported as one of the most promising technologies for high-end display applications. In this work, time-resolved electrical behaviour of these devices has been obtained through a set of systematic measurements. The electrical equivalent circuit has been derived, a number of simulations at different frequencies have been performed using commercial software for analogue circuits. Performance of this electrical model to account for time domain variations of switching currents in chiral smectic LC displays with V/W-shaped electrooptical response has been analyzed as well.

Optoelectronic multiplexer for digital data processing based on liquid crystal pixels and optical fiber elements

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Perez I. , Pena J. M. S. , Torres J. C. , Manzanares R. , Marcos C. , Vazquez C.

Opto-Electronics Review

2007

tom Vol. 15, No. 2

78-81

In this work, we present an optoelectronic digital multiplexer 4:1 based on a multipixel nematic liquid crystal cell. This device uses two optical control signals to select one among four possible optical data inputs. These data signals are generated by four red LEDs, which are guided through plastic optical fiber towards liquid crystal pixels. For our purpose, only four pixels of the cell will be used to modulate the optical signal across them. Each pixel will be addressed by a square waveform coming from the conditioning circuit managed by a microcontroller system. The electronic control allows the multiplexer to work as simple two input logical gates such as AND, NAND, OR, NOR, XOR and XNOR. The operation time of the device is limited by the response time of LC cell that is in the