Circuit for eyesight protection in a television set

Details Circuit for eyesight protection in a television set Circuit for eyesight protection in a television set

H - Electricity

04

N

343/4, 350/83

H04N 5/44 (2006.01) G01S 17/02 (2006.01) G08B 21/18 (2006.01)

Patent

CA 1263743

ABSTRACT This disclosure depicts a circuit for protecting eyesight from the screen of a TV set. An infrared transmitter is provided on a side of the front of the TV set so that pulse signals therefrom after reflecting upon a viewer within a predetermined distance are received on a receiving-amplifying portion for remote control which is already installed in the TV set. A monostable multivibrator has an input to which is applied the pulse output signal from the remote control receiving-amplifying portion thereto. A delay circuit portion has an input operatively connected to the output of the monostable circuit portion. The monostable multivibrator produces higher level signals on the output thereof when the higher level signals are applied on its input over a predetermined time and produces lower level signals otherwise. A video amplifier driving circuit portion for controlling the "ON" and "OFF" of video amplifier which has an input operatively connected to the output of the delay circuit portion and also has an output.

517965

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