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油膜光阀是当前大型投影电视比较成熟的一种方案。它在亮度、清晰度、对比度以及实现彩色显示等方面都具有较好的特性。和一般电视显像管类似,在油膜光阀管中,电子枪产生的电子束在扫描时受到电视信号的调制。由于油膜光阀采用一般显像管所用的密度调制方式时,画面容易出现所谓“勾边”现象——即在图像的黑白分明的边界处出现不应有的亮条,破坏图面的逼眞性,因此在油膜光阀中巳不再采用密度调制。现在国外油膜光阀主要是采用聚焦调制和射束微摆调制。此外,采用什么样的调制方式还关系到彩色方案的选择。我们学习国外的先进经验,在调制方式上进行了一些初步试验,本文主要从电子枪的角度谈谈对聚焦调制的一些认识。
Film light valve is the current large-scale projection television a more mature program. It has good features in terms of brightness, sharpness, contrast and color display. Similar to a typical television picture tube, in an oil film tube, the electron beam from the electron gun is modulated by the television signal during scanning. As the oil film light valve used in the general picture of the density modulation used in the picture prone to the so-called “Cloak” phenomenon - that is, in the black and white image of the border there should be an unwanted light bar, destruction of the pressing force of the surface, Therefore, the film light valve has no longer used density modulation. Now foreign oil film light valve is mainly used to focus modulation and beam micro-pendulum modulation. In addition, what kind of modulation is also related to the choice of color scheme. We learn advanced foreign experience in the modulation on the way to conduct some preliminary tests, this paper mainly from the perspective of the electron gun talk about some of the focus on modulation.