Patent ID: 6534920
Filing Date: 2003-03-18
Classification: G09G,H04N

Abstract:
A horizontal deflection circuit for performing bidirectional scanning with an electron beam in the horizontal direction of a screen for displaying an image, comprising:a horizontal deflection coil; a first current supply circuit for supplying said horizontal deflection coil with first horizontal deflection current for forward horizontal deflection; a second current supply circuit for supplying said horizontal deflection coil with second horizontal deflection current for backward horizontal deflection; a first driving circuit for driving said first current supply circuit so that voltage generated by said first horizontal deflection current is in synchronization with a first timing signal indicating a trace scanning period; a second driving circuit for driving said second current supply circuit so that voltage generated by said second horizontal deflection current is in synchronization with a second timing signal indicating a retrace scanning period; a deflection current correction circuit for correcting said first horizontal deflection current and said second horizontal deflection current based on a first correction waveform periodically changing at vertical scanning intervals; and a driving timing correction circuit for correcting the driving timing of said first current supply circuit by the first driving circuit and the driving timing of said second current supply circuit by the second driving circuit based on a second correction waveform periodically changing at the vertical scanning intervals corresponding to said first correction waveform so that the horizontal positions of corresponding portions of forward and backward video signals coincide in each position in the vertical direction of the screen.