Picture display device with uniformity correction of electron supply

PCT No. PCT/IB94/00171 Sec. 371 Date Feb. 16, 1995 Sec. 102(e) Date Feb. 16, 1995 PCT Filed Jun. 23, 1994 PCT Pub. No. WO95/01705 PCT Pub. Date Jan. 12, 1995A picture display device (W) includes a display unit (1) having a vacuum envelope which is provided with a transparent face plate (3), having a luminescent screen, and a rear plate (4). The display unit has 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(611) for withdrawing each electron current at predetermined locations from its transport duct and for directing the withdrawn current toward desired pixels of the luminescent screen. In order to direct the correct quantity of electrons into the electron transport ducts for 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.