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Three Slot Drive Scheme for Multiplexing of Ferroelectric Liquid Crystal Shutter Devices

IP.com Disclosure Number: IPCOM000103728D
Original Publication Date: 1993-Jan-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Chieu, TC: AUTHOR

Abstract

Disclosed is a driving scheme for the simple multiplexing or/and the multiplexing of two-terminal active-matrix addressed surface-stabilized ferroelectric liquid-crystal (FLC) shutter devices. This driving scheme uses voltage waveforms with three equal time slots, in contrast to other driving schemes with four time slots or more, thus allowing shorter addressing time or higher multiplexing ratio for a given FLC material.

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Three Slot Drive Scheme for Multiplexing of Ferroelectric Liquid Crystal Shutter Devices

       Disclosed is a driving scheme for the simple multiplexing
or/and the multiplexing of two-terminal active-matrix addressed
surface-stabilized ferroelectric liquid-crystal (FLC) shutter
devices.  This driving scheme uses voltage waveforms with three equal
time slots, in contrast to other driving schemes with four time slots
or more, thus allowing shorter addressing time or higher multiplexing
ratio for a given FLC material.

      The present  scheme consists of an on- (11) and an off- (12)
waveform for the column data-lines, and a select (13) and a
non-select (14) waveform for the row select-lines, as shown in the
figure.  The on- (11) and off- (12) data waveforms have exactly
opposite phases with voltage amplitudes Vac varying between positive
and negative polarities with a zero voltage period inbetween, such
that a net zero DC is always maintained.  The non-select (14)
waveform is a constant zero voltage.  The select (13) waveform
consists of non-equal amplitude voltages V1, V2 and V3, with V1 and
V2 having the same polarity and V3 having the opposite polarity such
that
             V1 + V2   =   V3  .

      For the application of the three-slot scheme to two-terminal
active-matrix addressed FLC devices, such as metal-insulator-metal
diodes, the select (13) waveform can be modified to
             V1 + V2   =   V3   - Vth,
wh...