Title (en)

LIQUID CRYSTAL ELECTRO-OPTICAL DEVICE AND METHOD FOR DRIVING THE SAME

Publication

EP 0420129 A3 19920422 (EN)

Application

EP 90118351 A 19900924

Priority

JP 24873189 A 19890925

Abstract (en)

[origin: EP0420129A2] A liquid crystal electro-optical device and a method for driving the same are disclosed. The liquid crystal electro-optical device comprises a pair of substrates and nematic liquid crystals disposed between said pair of substrates in a helical structure. In the present invention the liquid crystal electro-optical device having a duty number of 200 or more is driven at a frame frequency of 200 to 280Hz, and thereby high contrast can be obtained.

IPC 1-7

G09G 3/36

IPC 8 full level

G02F 1/133 (2006.01); G09G 3/36 (2006.01)

CPC (source: EP)

G09G 3/3622 (2013.01)

Citation (search report)

• [A] HITACHI REVIEW. vol. 38, no. 2, April 1989, TOKYO JP pages 103 - 108; K.KINUGAWA ET AL.: 'High Resolution Super-Twisted Nematic Liquid Crystal Displays'
• [A] IEE PROCEEDINGS I. SOLID- STATE & ELECTRON DEVICES. vol. 133, no. 4, August 1986, STEVENAGE GB pages 145 - 151; J.R.HUGHES ET AL.: 'Contrast variations in high-level multiplexed twisted nematic liquid crystal displays'
• [A] TRANSACTIONS OF THE INSTITUTE OF ELECTRONICS, & COMMUNICATION ENGINEERING vol. E71, no. 11, November 1988, TOKYO JP pages 1063 - 1069; E.KANEKO: 'Directly Addressed Matrix Liquid Crystal Display Panels with High Information Content'

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0420129 A2 19910403; EP 0420129 A3 19920422; JP 2873616 B2 19990324; JP H03174116 A 19910729

DOCDB simple family (application)

EP 90118351 A 19900924; JP 24178290 A 19900911