CHILD SCREEN FRAME GENERATING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a child screen frame generating circuit for generating a child screen frame corresponding to movement, extension, or reduction of child screen video display on a screen. SOLUTION: The child screen frame generating circuit is provided with a frame horizontal display position detection circuit 501 and a frame vertical display position detection circuit 503 for detecting position information of the child screen frame at an upper left end and an upper right end on the basis of a frame display ON / OFF control setting value S106 set by an optional means and a child screen display pulse S107 denoting a child screen video image display period, and the child screen frame generating circuit decides the horizontal display position and the vertical display position of the frame on the basis of the position information of the child screen frame at the upper left end and the upper right end to generate the child screen frame. COPYRIGHT: (C)2004,JPO&NCIPI