Patent ID: 6912015
Filing Date: 2005-06-28
Classification: H04N

Abstract:
1. A video display apparatus comprising: a horizontal deflection circuit for deflecting an electron beam back and forth in the horizontal direction to form forward and backward scanning lines in the horizontal direction on a screen; a vertical deflection circuit for deflecting said electron beam in the vertical direction; and a vertical velocity modulation circuit for modulating the scanning speed in the vertical direction of an electron beam for successively forming scanning lines in the horizontal direction on a screen, wherein said vertical velocity modulation circuit comprises: a parallel scanning circuit for outputting a parallel scanning signal for making the forward and backward scanning lines formed by said horizontal deflection circuit parallel; a movement control circuit for producing a movement control signal for controlling the movement in the vertical direction of the scanning lines such that a part of the scanning line having a luminance which is not less than a predetermined value in a luminance change portion in the vertical direction on the basis of a luminance signal moves farther apart from a part of the adjacent scanning line having a lower luminance than said predetermined value; a synthesizing circuit for synthesizing the parallel scanning signal outputted by said parallel scanning circuit and the movement control signal produced by said movement control circuit; and a vertical velocity modulation coil for generating a magnetic field for modulating the scanning speed in the vertical direction of the electron beam on the basis of a signal synthesized by said synthesizing circuit.