Apparatus for automatic control of display device bias

Details Apparatus for automatic control of display device bias Apparatus for automatic control of display device bias

H - Electricity

04

N

350/83

H04N 5/57 (2006.01) H04N 9/72 (2006.01)

Patent

CA 1241108

RCA 81836 ABSTRACT APPARATUS FOR AUTOMATIC CONTROL DISPLAY DEVICE BIAS A television receiver with a planar faceplate kinescope includes an automatic kinescope bias (AKB) control system (14a,b,c) wherein the kinescope electron gun (16,18) is energized to induce a cathode input current, representative of the kinescope black image current level, in response to an auxiliary drive signal (VG) applied to the electron gun during AKB operating intervals. The auxiliary signal (VG) exhibits an amplitude for inducing the cathode current only during horizontal trace intervals encompassed by the interval when the auxiliary signal occurs.

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