公开(公告)号：EP0938809B1

公开(公告)日：2003-09-03

申请号：EP97911391.7

申请日：1997-11-12

申请人： Thomson Licensing S.A.

发明人： TRIPOD, Luc

IPC分类号： H04N3/185 ,  H04N3/233

CPC分类号： H04N3/233 ,  H04N3/185

摘要： A circuit for regulating an anode voltage (EHT) in an information display apparatus. A horizontal deflection circuit (10) has trace and retrace modes of operation. The horizontal deflection circuit further has a fixed retrace capacitance (CR1); and a series combination of a switched retrace capacitance (CR2) and a switch element (TR1), which combination is coupled in parallel with the fixed retrace capacitance. The switch element is in a closed position as the horizontal deflection circuit enters the retrace mode of operation. A voltage divider network (R1, R2) samples the anode voltage. A control circuit (20) is responsive to the sample voltage (V1) for controlling the switch element, such that the control circuit effects regulation of the anode voltage by selecting a time during the retrace period at which to place the switch element in an open position. The control circuit may also provide a raster width compensation voltage for an east-west pincushion correction circuit.