Title: Method and device for driving in time division fashion field effect mode liquid crystal display device for numeric display

Abstract: In a method and device for driving in time division fashion a field effect mode liquid crystal display device for numeric display, having a plurality of sets of segment electrodes, each set being provided for one digit, and a plurality of separated digit electrodes disposed opposite to the plurality of segment electrode sets respectively, the corresponding segment electrodes of the respective digits being commonly connected, the amplitude of voltages applied to the display points in the half-selected and non-selected states are kept constant while the effective value of the voltage applied to the display points in the selected state is arbitrarily set by changing the duty ratio of selection time so that color in the display may be changed.

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Inventors: Kawakami, Hideaki (Hitachi, JA)

Application Number: 471602
Filing Date: 1974-05-20
Publication_date: 1976-08-17
Assignee: Hitachi, Ltd. (JA)
Primary Class(es): 345/52 345/88, 349/142
Other Classes:
US Patent Ref:

3711180	Jan, 1973	Klinger et al.	358/61.
3758195	Sep, 1973	Hedman et al.	350/160.
3835463	Sep, 1974	Tsukamoto et al.	340/324.

Other Refs:
Primary Examiner: Trafton, David L.
Assistant Examiner:
Attorney: Craig & Antonelli