Basic technologies of a drive system with digital drivers that have gray-scale interpolative functions are reported. The driver reported in this paper is a 3-bit driver, although it is the first digital driver in practical use that performs gray-scale interpolation. It has also become the starting point of the following higher multi-gray-scale drivers. The driver is designed by 5 volt withstanding process that is the standard process of a digital LSI. It should be used in combination with the AC common driving scheme (ACCDS). The ACCDS itself is not a new concept, however, the floating gate driving method proposed in this paper makes the ACCDS possible without deteriorating picture quality. In addition in this paper, the issue of the transparency asymmetry with respect to polarity of the drive voltage is discussed and the importance of estimating the asymmetry compensation errors inevitable in a drive system that performs gray-scale interpolation is discussed. It is also shown that the floating gate driving method can be simplified as long as the compensation errors are under a certain limit.
