Cathode ray tube displays
    91.
    发明公开
    Cathode ray tube displays 失效
    Kathodenstrahlröhrenaufzeichnungsvorrichtung。

    公开(公告)号:EP0272893A2

    公开(公告)日:1988-06-29

    申请号:EP87311189.2

    申请日:1987-12-18

    申请人: THORN EMI plc

    IPC分类号: H04N3/16 H04N5/44

    CPC分类号: H04N5/44

    摘要: Display apparatus which includes a cathode ray tube. Electrical signals carrying information indicative of visual images are conveyed to an electrode in the tube and an electron beam is modulated in response to the signal and scans the screen in line and field directions to generate visual images. The line scan causes the beam to move alternately in the forward sweep (display) and flyback directions and the apparatus is arranged to cause the ratio of blanking period to display period to be greater than conventional values, i.e. at least 23.08%. Increasing blanking time and hence available flyback time over conventional values allows display improvement techniques, such as increasing field rate or number of lines per field, to be used without requiring, for example, line output transistors with higher voltage ratings.

    摘要翻译: 包括阴极射线管的显示装置。 携带指示视觉图像的信息的电信号被传送到管中的电极,并且响应于信号调制电子束并且沿着线和场方向扫描屏幕以产生视觉图像。 线扫描使得光束在正向扫描(显示)和反激方向上交替移动,并且该设备被布置成使得消隐周期的显示周期的比率大于常规值,即至少23.08%。 增加消隐时间,因此与常规值相比可获得的回扫时间允许使用显示改进技术,例如增加现场速率或每个场的行数,而不需要例如具有较高额定电压的线路输出晶体管。

    Vertical deflection circuit
    92.
    发明公开
    Vertical deflection circuit 失效
    Vertikal-Ablenkschaltung。

    公开(公告)号:EP0242124A1

    公开(公告)日:1987-10-21

    申请号:EP87303081.1

    申请日:1987-04-09

    IPC分类号: H04N3/16 H04N9/29

    摘要: A vertical deflection amplifier (20) of a video display apparatus includes first (Q1) and second (Q2) transistor amplifier output stages arranged in a totem-pole, push-pull configuration. A vertical deflection winding (Lv) is coupled to the output stages at a deflection amplifier output terminal (22). An S-capacitor (C1) is coupled to the deflection winding (L v ) at a second terminal (21) remote from the output terminal (22). A source (23) of deflection rate signals is coupled to the deflection amplifier (20) for generating a deflection current (iv) in the deflection winding (Lv). A base current generating circuit (40) is coupled to one (Q1) of the transistor amplifier output stages for providing base current (i 1) thereto. The S-capacitor voltage (V1) is applied to the base current generating circuit (40) for enabling conduction of base current (i1) in the one amplifier output stage (Q1). When the video display apparatus is first turned on, the initially discharged S-capacitor (C1) is slowly charged from a DC voltage supply (+30V) to delay generation of vertical deflection past completion of picture tube degaussing.

    摘要翻译: 视频显示装置的垂直偏转放大器(20)包括以图腾柱推挽配置布置的第一(Q1)和第二(Q2)晶体管放大器输出级。 垂直偏转绕组(Lv)在偏转放大器输出端(22)处耦合到输出级。 S电容器(C1)在远离输出端子(22)的第二端子(21)处耦合到偏转绕组(Lv)。 偏转率信号的源极(23)耦合到偏转放大器(20),用于在偏转绕组(Lv)中产生偏转电流(iv)。 基极电流产生电路(40)耦合到晶体管放大器输出级的一个(Q1),以向其提供基极电流(i1)。 将S电容电压(V1)施加到基极电流发生电路(40),以使得能够导通一个放大器输出级(Q1)中的基极电流(i1)。 当视频显示装置首次接通时,初始放电的S电容器(C1)从DC电压源(+ 30V)缓慢充电,以延迟在显像管消磁完成之后产生垂直偏转。