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彩色电视接收机和监示器是彩色电视系统的终端设备,真实地重现被传送的图象,不仅要有较好的图象清晰度,还要色彩鲜艳逼真。由于黑电平对图象的色彩有很大关系,所以电视机黑电平的调整必须十分精细正确,同时黑电平也必须十分稳定。彩色三枪显象管的三个电子枪,其跨导和电子束的截止电压值是不可能完全一致的,图1是一种可能的状态。可以明显地看出,三个枪的跨导和截止电压值(-E_(g0))均不一致。由电子管的理论可以知道,射束电流的截止偏压值是与帘栅极电压(E_(g2))有关,即 -E_(g0)=f(E-(g2))且-E_(g0)∝E_(g2) 所以为了要取得屏幕光栅的暗平衡(即在屏幕亮度较低时,红绿蓝三色具有相同亮度),必须将三个枪的帘
Color television receivers and monitors are terminal devices for color television systems that faithfully reproduce the transmitted images, not only with good image clarity but also with vivid colors. Since the black level has a great influence on the color of the image, the adjustment of the black level of the television must be very fine and accurate, and the black level must also be very stable. Color three guns three electron guns, the transconductance and electron beam cut-off voltage values are not exactly the same, Figure 1 is a possible state. It is evident that the transconductance and cut-off voltage values (-E_ (g0)) of the three guns are not uniform. From the theory of the electron tube, it can be known that the off-bias value of the beam current is related to the screen grid voltage (E_ (g2)), ie -E_ g0 = fE_g2 and -E_ g0. ΑE_ (g2) Therefore, in order to obtain the dark balance of the screen raster (that is, when the screen brightness is low, the red, green and blue colors have the same brightness), the curtain of three guns