Abstract: An apparatus for reducing Moire interference in a color cathode ray tube produced due to inconsistent spacing of scanning lines with respect to the dot pitches of a shadow mask during the display of video signals. The apparatus includes a sync signal dividing section for dividing by 2 horizontal and vertical sync signals separated from an input video signal, a vertical position control signal output section for outputting to a vertical position control section a voltage signal which varies according to a scanning Moire control signal selectively inputted by a user, and a horizontal position control signal output section for outputting to a horizontal oscillation control section a voltage signal which varies according to a video Moire control signal selectively inputted by the user, so that the vertical position of the even or odd scanning lines as well as the horizontal position of the even or odd image dots are adjusted to suppress the Moire interference.

Abstract: Apparatus and method for automatically adjusting a picture size of a video appliance such as a monitor. According to the apparatus and method, since electrical characteristic data of the video appliance employing the apparatus of the present invention is preset therein, regardless of input of any external data, a user's one time input or automatic picture-adjusting mode selection makes external input data and preset characteristic data be compared, and the horizontal and vertical picture size of the video appliance in the video appliance is automatically adjusted. Therefore, the adjusting step is simplified in the manufacturing process of monitor, promoting productivity, and decreasing the cost thereof.