Beam current measurement
    1.
    发明申请
    Beam current measurement 审中-公开
    光束电流测量

    公开(公告)号:US20060043958A1

    公开(公告)日:2006-03-02

    申请号:US10527895

    申请日:2003-08-08

    IPC分类号: G01N27/00

    摘要: The display apparatus comprises a picture tube (CRT) with an electron gun which generates an electron beam (BB) directed towards a display screen. The electron gun comprises a first and a second electrode (CA, G1). The electron beam (EB) originates from the first electrode (CA). The voltage between the first electrode (CA) and the second electrode ( G1) controls the intensity of the electron beam (EB). A beam current (IB) flows in the first electrode (CA) in response to the electron beam (EB). A (ICA) in the first electrode (CA) is the sum of the beam current (IB) and a current (IC) flowing through a capacitance (CWN) between the first and the second electrode (CA, G1). A compensation circuit (COM) supplies a compensation current (ICO) to the first electrode (CA) to compensate for a capacitive current (IC) through a capacitance (CIN) between the first and the second electrode (CA, G1). A beam current measurement circuit (BMC) measures the total current (IT) which is the sum of the total current in the first electrode (ICA) and the compensation current (ICO).

    摘要翻译: 显示装置包括具有电子枪的显像管(CRT),该电子枪产生指向显示屏的电子束(BB)。 电子枪包括第一和第二电极(CA,G 1)。 电子束(EB)起源于第一电极(CA)。 第一电极(CA)与第二电极(G 1)之间的电压控制电子束(EB)的强度。 射束电流(IB)响应于电子束(EB)在第一电极(CA)中流动。 “img id =”custom-character-00001“he =”2.56mm“wi =”46.20mm“file =”US20060043958A1-20060302-P00999.TIF“alt =”在提交时丢失或难以辨认“img-content =” 第一电极(CA)中的字符“img-format =”tif“/>(ICA)是流过第一和第二电极之间的电容(CWN)的电流(IB)和电流(IC)的总和 电极(CA,G 1)。 补偿电路(COM)通过第一和第二电极(CA,G 1)之间的电容(CIN)向第一电极(CA)提供补偿电流(ICO)以补偿电容电流(IC)。 光束电流测量电路(BMC)测量作为第一电极(ICA)中的总电流与补偿电流(ICO)之和的总电流(IT)。