Stmicroelectronics S.a.

Eric Cirot

Michel Barou

Jean-Raphaël Bezal

Danika Chaussy

A device for controlling a matrix screen includes a scanning circuit. The scanning circuit includes a row control block which successively selects each row, and a column control block which, for each selected row, selects or deselects a set of columns of the screen with the aid of column selection or deselection signals. The temporal evolution of each column selection signal and of each column deselection signal includes a first and a second part separated by an intermediate porch. The column control block, for each column of the screen, determines if the corresponding column has to be selected or deselected, determines the value of the capacitance seen by the column termed the column-capacitance, and adjusts temporal evolution characteristics of the selection or deselection signal of at least one column to be selected or deselected as a function of the determined value of its column-capacitance.

Method of controlling a matrix screen and corresponding device

A device for producing a video image sharpness improvement signal (DOC-DOC), with black level clipping of an associated video signal, comprises a differential transconductance stage processing the video signal and whose bias currents (Imax) are directly proportional to the active component (&#x394;V) of the video signal so as to bring about a black level sharpness improvement signal clipping.

Growing community of inventors

Grenoble, France

Eric Cirot