Title: Method of driving a liquid crystal display apparatus

Abstract: A pulse applying method comprising applying a pulse train having a constant period to any one of a selection electrode and a control electrode which are opposed each other through a liquid crystal, while applying to the other a pulse train having a specific phase relationship with the said pulse train, whereby setting the total application time per unit period of the pulse applied between the selection electrode and the control electrode to two states, one being of the case where the liquid crystal operates and the other of the case where the liquid crystal does not operate, thus making the liquid crystal display unit indicative and non-indicative. A clear display with uniform contrast is obtainable. Moreover, a low-voltage drive is possible and the response speed is high.

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Other info:

Inventors: Fujita, Masanori (Matsudo, JP)
Oda, Hajime (Sakura, JP)

Application Number: 773307
Filing Date: 1977-03-01
Publication_date: 1980-01-29
Assignee: Kabushiki Kaisha Seikosha (JP)
Primary Class(es): 345/53 345/208
Other Classes:
US Patent Ref:

3918041	Nov, 1975	Mao	340/336.
3981004	Sep, 1976	Shimizu et al.	340/336.
3995942	Dec, 1976	Kawakami et al.	340/336.
4019178	Apr, 1977	Hashimoto et al.	340/336.
4048633	Sep, 1977	Sano	340/336.

Other Refs:
Primary Examiner: Curtis, Marshall M.
Assistant Examiner:
Attorney: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.