ELECTRIC DIMMING DEVICE AND ITS DRIVING METHOD

Title:

ELECTRIC DIMMING DEVICE AND ITS DRIVING METHOD

Document Type and Number:

WIPO Patent Application WO/2002/086607

Kind Code:

A1

Abstract:

An electric dimming device used in an imaging device or a display device, and a method for driving the device. When a diaphragm adjusting control signal is changed from the current diaphragm adjusting value (±VX1) to a large value (±VY1) (that is, when the light transmittance of a positive liquid crystal is raised the light transmittance of a negative liquid crystal is lowered), a period for which the value (±VZ1) is larger than the large value (±VY1). The energy and time of this large value (±VZ1) are determined according to a preset value. Therefore, the response speed of when the light transmittance can be remarkably raised, and a rate of change of one or less field period required as the diaphragm mechanism of a video camera can be realized.

Inventors:

KAWABATA MASARU (JP)
UDAKA TORU (JP)
YANAGIDA TOSHIHARU (JP)
TAKAOKA TOSHIFUMI (JP)
TANAKA KAZUHIRO (JP)

Application Number:

PCT/JP2002/003923

Publication Date:

October 31, 2002

Filing Date:

April 19, 2002

Export Citation:

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Assignee:

SONY CORP (JP)
KAWABATA MASARU (JP)
UDAKA TORU (JP)
YANAGIDA TOSHIHARU (JP)
TAKAOKA TOSHIFUMI (JP)
TANAKA KAZUHIRO (JP)

International Classes:

G02F1/133; G03B9/02; H04N5/238; G02F1/1335; G02F1/139; (IPC1-7): G02F1/133; G02F1/137

Domestic Patent References:

WO1999065013A1

1999-12-16

Foreign References:

JP2002122843A	2002-04-26
JP2002122845A	2002-04-26

Other References: