France Telecom Etablissement Autonome De Droit Public (Centre National

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

France Telecom Etablissement Autonome De Droit Public (Center National

Gilbert Martel

Patrice Senn

Alan Lelah

Denis Pradel

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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Meylan, France

Gilbert Martel