数字表自问世到出售至今时间并不算长,但其数量却越来越多。目前,在市售的数字表中,其显示部分有用液晶的显示设备(LCD)和发光二极管(LED)等,也有用象数字印刷转盘那样的机械显示设备。本文献仅对前者加以论述。不言而喻,对钟表来说可靠性是其重要特性之一,此特点在数字表中也是一样的。 The number of tables since the advent of the sale date is not a long time, but the number is more and more. Presently, in the commercially available digital watch, display devices (LCDs) and light-emitting diodes (LEDs), which have liquid crystal displays on their display portions, are also used, and mechanical display devices such as digital printing carousels are also used. This article only discusses the former. It goes without saying that the reliability of the clock is one of its important features, this feature is the same in the digital table.