ELECTROPHORETIC DEVICE HAVING A TRANSPARENT LIGHT STATE

A metastable light attenuator includes an electrophoretic cell having spaced-apart first and second electrodes, and electrophoretic ink therebetween including charged particles. A programmable controller applies signals to the electrodes generating an intermittent electric field across the ink to dr...

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Bibliographische Detailangaben
1. Verfasser:	O'KEEFFE, Donal
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	A metastable light attenuator includes an electrophoretic cell having spaced-apart first and second electrodes, and electrophoretic ink therebetween including charged particles. A programmable controller applies signals to the electrodes generating an intermittent electric field across the ink to drive particles to one of a first extreme light state in which particles are maximally spread within the cell in the path of light through the cell to strongly attenuate light transmitted through the cell, or a second extreme light state in which particles are maximally concentrated within the cell and removed from the path of light through the cell and to substantially transmit light through the cell, or two or more light states intermediate the first and second light states. The controller applies intermittent signals to the electrodes to drive the particles from one intermediate state to a second intermediate state within a light transmittance range defined by the two intermediate light states to avoid flashing.