小结(字符显示的必要工作条件):(1)必须同时引入正常的行、场逆程脉冲。其中行逆程脉冲的作用是:确定字符在屏幕横向上的位置:而场逆程脉冲的作用是确定字符在屏幕纵向上的位置。因此,二者缺一不可,若任何一种脉冲丢失或幅度过小,都会导致字符消失。 Summary (characters show the necessary working conditions): (1) must be introduced at the same time normal line field reverse pulse. The effect of the line reverse pulse is to determine the position of the character in the horizontal direction of the screen: the effect of the field inverse pulse is to determine the position of the character in the longitudinal direction of the screen. Therefore, both are indispensable, if any kind of pulse is lost or the amplitude is too small, can cause the character to disappear.