Oblon, Fisher, Spivak, McClelland & Maier
Display device
 The present invention relates to display devices used as terminal devices for an electronic computer or the like, and more particularly to digital displays in a specific display region on a display device having character display functions. In digital display, read errors tend to occur if the digit places or decimal points on the display screen disagree with each other. The invention has solved this problem by the use of special codes designating on the display screen a region permitting the display of only digits and specific symbols attendant to digits. Therefore the display device of the invention is characterized in that when an input data appears in the designated digital region (or digital area), it is determined whether the input data is of a digit or of a specific symbol attendant to a digit. The date, when discriminated as a specific symbol, is written into the last significant digit place in the digital area causing the existing digit to be carried. This display device is characterized also by its ability to coordinate decimal points on the display screen. The device of the invention is further characterized in that any digital input overflow can be detected according to the manner in which a carry is completed, i.e., whether a digit or a specific symbol attendant to a digit has been detected or a predetermined specific symbol, not a digit, has been detected. 
Mitsubishi Denki Kabushiki Kaisha
G G
G09G G06F
inventional inventional
Yoshiteru Kiyoto Osamu
Nakamura Ohkawa Watanabe