Picture display device comprising a flat-panel type display...

H - Electricity – 04 – N

Patent

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Details

H04N 9/12 (2006.01) G09G 1/20 (2006.01) G09G 3/00 (2006.01) H04N 5/70 (2006.01)

Patent

CA 2142285

2142285 9501705 PCTABS00035 Picture display device (W) comprising a display unit (1) having a vacuum envelope which is provided with a transparent face plate (3) with a luminescent screen and a rear plate (4), said display unit comprising a plurality of juxtaposed sources (5) for emitting electrons, a plurality of electron transport ducts (6, 6', 6'') cooperating with the sources for transporting the electrons in the form of electron currents, and selection means (611) for withdrawing each electron current at predetermined locations from its transport duct and for directing said current towards desired pixels of the luminescent screen. In order to direct the correct quantity of electrons into the electron transport ducts for the relevant video information, the voltages applied to the grids are modulated with a video signal and a uniformity correction signal. One of these signals controls a pulse-duration and the other signal controls a pulse-height of the drive signals.

L'invention concerne un dispositif d'affichage d'image (W) qui comprend un élément afficheur (1) dont l'ampoule à vide comporte une fenêtre transparente (3), un écran luminescent et un panneau arrière (4). Cet élément est équipé de plusieurs sources (5) juxtaposées qui émettent des électrons, de plusieurs conduits d'acheminement des électrons (6, 6', 6'') qui, en combinaison avec les sources, acheminent les électrons sous forme de courants d'électrons, et d'un organe de sélection (611) permettant de retirer un courant d'électrons de son conduit d'acheminement et de le diriger vers les pixels voulus de l'écran luminescent. Pour envoyer dans les conduits d'acheminement la quantité d'électrons correspondant à l'information vidéo pertinente, la tension appliquée aux grilles est modulée au moyen d'un signal vidéo et d'un signal de correction d'uniformité. L'un de ces signaux permet de contrôler la durée d'impulsion et l'autre l'amplitude d'impulsion des signaux d'attaque de grille.

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