| http://www.w3.org/ns/prov#value | - A display apparatus including a cathode ray tube, and a horizontal deflection output circuit for driving a horizontal deflecting coil to deflect an electron beam of said cathode ray tube, said display apparatus further comprising:a luminance detecting circuit connected to a flyback transformer which supplies an anode voltage to said cathode ray tube, for detecting a luminance of said cathode ray t
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