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Title:
METHOD FOR SETTING FRAME FREQUENCY OF LIQUID CRYSTAL DISPLAY DEVICE, ITS DRIVE METHOD AND ELECTRONIC EQUIPMENT USING IT
Document Type and Number:
Japanese Patent JP09281463
Kind Code:
A
Abstract:

To make a display without a flicker, lowering. etc., in a contrast ratio possible and to make high picture quality and low power consumption possible by changing a frame frequency according to a response speed of a display element in a liquid crystal display device simultaneously selecting several pieces of scanning lines among plural pieces of scanning lines and driving the display element.

For lowering the frame frequency, multi-line drive is performed, and the power consumption is reduced. An ATP method (a) including a regular liquid crystal making the frame frequency 45Hz and with the response speed 200ms is compared with the case (b) of the multi-line drive driving four pieces of scanning lines by simultaneous selection. In the ATP method (a), since a selection period is once in one frame, a change in transmissivity at an ON time is violent, and since the frame frequency is late also, a remarkably large flicker is observed. Further, the mean transmissivity at the ON time is reduced remarkably also. On the contrary, in the case (b) using a four line simultaneous selection method at the frame frequency of 45Hz, the selected number of times become four times to be dispersed uniformly to the whole frame period, and a voltage is applied to the liquid crystal uniformly.


Inventors:
Kurumisawa, Takashi
Ito, Akihiko
Yamazaki, Taku
Application Number:
JP1997000029472
Publication Date:
October 31, 1997
Filing Date:
February 13, 1997
Export Citation:
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Assignee:
SEIKO EPSON CORP
International Classes:
G02F1/133; G09F9/35; G09G3/36; G02F1/13; G09F9/35; G09G3/36; (IPC1-7): G02F1/133; G09F9/35; G09G3/36