公开(公告)号：US20040257008A1

公开(公告)日：2004-12-23

申请号：US10812843

申请日：2004-03-30

Applicant: STMicroelectronics S.A.

Inventor： Jean-Michel Moreau

IPC: G09G001/04

CPC classification number: H04N3/16

Abstract: The invention concerns a scanning circuit, comprising a power supply providing a negative voltage on a first terminal (Tdown), an intermediate voltage on a second terminal (Gnd) and a positive voltage on a terminal of a switch (S), the other terminal of the switch being connected to a third terminal (Tup), a control circuit (6) supplied by connections to the second and third terminals, a differential amplifier receiving a positive and a negative input signal provided by the control circuit, a power amplifier controlled by the differential amplifier, both amplifiers being supplied by connections to the first and third terminals, a deflection coil (Ly) connected between the output of the power amplifier and the second terminal, biasing means setting, when the switch is open, the output of the differential amplifier so that the possible current paths through the power amplifier between the deflection coil and the first terminal are cut.

Abstract translation: 本发明涉及一种扫描电路，包括在第一端子（Tdown）上提供负电压的电源，第二端子上的中间电压（Gnd）和开关（S）的端子上的正电压，另一个端子 所述开关连接到第三端子（Tup），通过连接到所述第二和第三端子提供的控制电路（6），接收由所述控制电路提供的正和负输入信号的差分放大器，控制的功率放大器 通过差分放大器，通过连接到第一和第三端子的两个放大器提供连接在功率放大器的输出端和第二端子之间的偏转线圈（Ly），当开关断开时，偏置装置设定输出 差分放大器，使得穿过偏转线圈和第一端子之间的功率放大器的可能电流路径被切断。