H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/57 (2006.01) H04N 3/18 (2006.01) H04N 3/20 (2006.01) H04N 5/63 (2006.01)
Patent
CA 2072321
A television apparatus includes a kinescope having a high voltage supply, a deflection circuit, a cathode driver amplifier and a control circuit for controlling operating modes of the receiver. A first means responsive to a turn-off command signal from the control circuit disables the high voltage supply and initiates turn off of the deflection circuit at a controlled rate. Concurrently, a second means responsive to the turn-off command applies a turn on drive signal to at least one electron gun of said kinescope for discharging high voltage therefrom. Advantageously, during turn-off the high voltage is drained from the kinescope as the displayed raster collapses thus providing benefits such as (1) the safety feature of having a fully discharged kinescope, (2) avoidance of kinescope spot burn and (3) prevention of kinescope after-glow.
L'invention est un appareil de télévision qui comprend un tube image ayant une alimentation haute tension, un circuit de déviation, un amplificateur d'attaque cathodique et un circuit de commande des modes de fonctionnement du récepteur. Un premier dispositif commandé par un signal de coupure transmis par le circuit de commande met l'alimentation haute tension hors fonction et amorce la mise hors tension du circuit de déviation à une vitesse contrôlée. Simultanément, un second dispositif commandé par le même signal de coupure transmet un signal de mise sous tension à l'un des canons électroniques au moins du tube image pour en abaisser la haute tension résiduelle. Durant l'opération de coupure, la haute tension du tube image s'évanouit en même temps que l'image affichée, ce qui procure les avantages suivants : 1) sécurité accrue du fait que le tube image est déchargé complètement, 2) absence de brûlure de l'écran par le spot et 3) absence de luminosité résiduelle sur l'écran.
Heidebroek Wolfgang
Wu Zeith Chun Hsing
Craig Wilson And Company
Thomson Consumer Electronics S.a.
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