JPH01180526A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPH01180526A
JPH01180526A JP450888A JP450888A JPH01180526A JP H01180526 A JPH01180526 A JP H01180526A JP 450888 A JP450888 A JP 450888A JP 450888 A JP450888 A JP 450888A JP H01180526 A JPH01180526 A JP H01180526A
Authority
JP
Japan
Prior art keywords
picture element
element group
dummy
display
liquid crystal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP450888A
Other versions
JP2569674B2 (en
Inventor
Yoshiharu Eiki
Nagamasa Ono
Original Assignee
Seiko Epson Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP63004508A priority Critical patent/JP2569674B2/en
Publication of JPH01180526A publication Critical patent/JPH01180526A/en
Application granted granted Critical
Publication of JP2569674B2 publication Critical patent/JP2569674B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To obtain a satisfactory image quality scarcely having an uneven contrast in the whole area of an image display area by placing a dummy picture element group in the outside peripheral part of a display use picture element group and driving a liquid crystal existing thereon by a dummy signal being different from a video display signal.
CONSTITUTION: At the outside of a display use picture element group 6, a dummy picture element group 7 of a picture element electrode group of vertical six columns and horizontal five rows is placed. In this state, an AC dummy signal is always applied continuously to a dummy picture element, and a liquid crystal on said picture element does not hold charge but always driven by an AC signal. In such a way, when the dummy picture element group 7 is driven by the AC signal, an uneven contrast is generated in a boundary of the dummy picture element group 7 and the display picture element group 6 after many hours, but since a transformation of a liquid crystal state in the boundary part is smooth, comparing with the case the outside periphery of the display picture element group 6 is a non-driving area, the uneven contrast is not generated for an extremely long period of time. In such a way, unevenness of the contrast can be prevented, and the display quality of the liquid crystal display device can be improved.
COPYRIGHT: (C)1989,JPO&Japio
JP63004508A 1988-01-12 1988-01-12 Liquid Crystal Display Expired - Lifetime JP2569674B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63004508A JP2569674B2 (en) 1988-01-12 1988-01-12 Liquid Crystal Display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63004508A JP2569674B2 (en) 1988-01-12 1988-01-12 Liquid Crystal Display

Publications (2)

Publication Number Publication Date
JPH01180526A true JPH01180526A (en) 1989-07-18
JP2569674B2 JP2569674B2 (en) 1997-01-08

Family

ID=11585994

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63004508A Expired - Lifetime JP2569674B2 (en) 1988-01-12 1988-01-12 Liquid Crystal Display

Country Status (1)

Country Link
JP (1) JP2569674B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622658A1 (en) * 1993-04-28 1994-11-02 Matsushita Electric Industrial Co., Ltd. Active matrix type liquid crystal display device
JPH06347750A (en) * 1993-06-11 1994-12-22 Kodo Eizo Gijutsu Kenkyusho:Kk Non-light emitting type display device and driving method therefor
US7612750B2 (en) 2001-11-28 2009-11-03 Sharp Kabushiki Kaisha Liquid crystal display device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622658A1 (en) * 1993-04-28 1994-11-02 Matsushita Electric Industrial Co., Ltd. Active matrix type liquid crystal display device
US5373378A (en) * 1993-04-28 1994-12-13 Matsushita Electric Industrial Co. Ltd. Active matrix type liquid crystal display device with peripheral pixel electrodes attached directly to signal lines
JPH06347750A (en) * 1993-06-11 1994-12-22 Kodo Eizo Gijutsu Kenkyusho:Kk Non-light emitting type display device and driving method therefor
US7612750B2 (en) 2001-11-28 2009-11-03 Sharp Kabushiki Kaisha Liquid crystal display device
US8421724B2 (en) 2001-11-28 2013-04-16 Sharp Kabushiki Kaisha Liquid crystal display device

Also Published As

Publication number Publication date
JP2569674B2 (en) 1997-01-08

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