France Telecom Etablissement Autonome De Droit Public (centre National

France Telecom

Societe D'applications Generales D'electricite Et De Mecanique Sagem

France Telecom Etablissement Autonome De Droit Public (center National

Alan Lelah

Patrice Senn

Gilbert Martel

Philippe Gravey

Denis Pradel

Nicole Wolffer

St&eacute;phane Gosselin

The invention concerns an optical switch for optical beams comprising a series of optical input channels ( ) and a series of optical output channels ( ), two optical index spatial modulating cells ( ) adapted to respectively deflect an optical beam coming out of an input channel and arriving onto an output channel, each series of optical channels ( ) being distributed according to two dimensions transverse to the direction of the channels and the index spatial modulating cells ( ) being each designed to produce deflections according to said two dimensions. The invention is characterised in that it comprises at least a convergent optical assembly ( ) overlapping one first of the two cells ( ) and whereof the focus, defined relative to the light path in the switch, is proximate to the plane of the other cell, and the or each convergent optical assembly ( ) has its optical center (X) bordering a deflecting cell ( ), substantially perpendicular to the center on one side of said cell.

Optical switch based on light spatial modulators

Control protective circuit, in particular of liquid crystal display screen. The protective circuit includes three transistors making possible the transfer of the voltage to output pin, the resetting of middle point and the resetting of the output. Application to the control of liquid crystal display screens.

Protective circuit for a control circuit, in particular of liquid

A circuit for controlling the lines of a display screen and including a t means with a single output is disclosed. The test means includes a single test control line (LCT), a single test output line (LST) and a plurality of sample holders (CEBj) and associated gates (Pj) and switches (Ij). The output voltage of the sample holders is transmitted onto a test output block (ST).

Circuit for controlling the lines of a display screen and including test

Sample and hold circuit for a liquid crystal display screen. The circuit comprises two stages, the first with switched capacitance the second with an amplifier device. Application to the control of liquid crystal display screens.

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Grenoble, France

Alan Lelah