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1.前言 为了实现墙壁电视,很多单位正在研制用矩阵屏显示电视图象的装置,同时正在研究主要问题之一——灰度级的显示方法。 虽然矩阵屏的亮度控制有模拟信号法和数字信号法,但从装置的毫无调整、工作稳定和集成化(小形、低功耗)等方面看,数字方法是适当的。作者们以前试验了用加权的数个亮度控制脉冲来控制电视图象显示器的亮度~1)、~2),这方面,别人也发表了几个实例~3)、~4)~5)。但是因为作成实际的显示装置时要求电路结构简单,所以灰度级不能过多,因此必须探讨不只是灰度级多,而
1. INTRODUCTION In order to implement wall-mounted televisions, many units are developing devices for displaying television images using matrix displays. At the same time, one of the major problems is being studied, a method of displaying grayscale images. Although the matrix screen brightness control analog signal method and digital signal method, but no adjustment of the device, stable and integrated (small, low power) and other aspects, the digital method is appropriate. The authors have previously experimented with a number of brightness control pulses weighted to control the brightness of a television image display ~ 1), ~ 2), in this regard, others also published a few examples ~ 3), ~ 4) ~ 5). However, since the actual display device requires a simple circuit structure, the gray level can not be excessively large. Therefore, it is necessary to explore not only the gray level but also the