H - Electricity – 04 – N
Patent
H - Electricity
04
N
355/25, 350/83
H04N 9/16 (2006.01) H01J 29/52 (2006.01) H04N 5/18 (2006.01) H04N 9/72 (2006.01) H04N 9/73 (2006.01) H04N 17/04 (2006.01)
Patent
CA 1156374
ABSTRACT OF THE DISCLOSURE An automatic brightness adjusting circuit for a cathode ray tube is disclosed which includes a video signal source from which a video signal is derived, a cathode ray tube having an electrode normally supplied with the video signal derived from the video signal source, a reference signal source for pro- ducing a reference signal, a signal processing circuit between the video signal source and the cathode ray tube, a switching circuit for selectively supplying either the video signal der- ived from the video signal source or the reference signal to the signal processing circuit, the switching circuit supplying the reference signal to the signal processing circuit during a brightness adjusting period, a control signal generator con- nected to the signal processing circuit for supplying the latter with a control signal the level of which varies gradu- ally during the brightness adjusting period, a level detector connected to the cathode ray tube for detecting a signal level at its electrode, and a control circuit responsive to the level detector for stopping the control signal generator from varying the control signal level and for actuating the switching circuit such that the latter supplies the video sig- nal to the signal processing circuit when the detected signal level of the electrode exceeds a predetermined value. The ad- justing circuit thus constructed can operate stably and per- form the adjusting operation in a short period of time.
368694
Gowling Lafleur Henderson Llp
Sony Corporation
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