JPS5487499A - Liquid-crystal display unit - Google Patents

Liquid-crystal display unit

Info

Publication number
JPS5487499A
JPS5487499A JP15600777A JP15600777A JPS5487499A JP S5487499 A JPS5487499 A JP S5487499A JP 15600777 A JP15600777 A JP 15600777A JP 15600777 A JP15600777 A JP 15600777A JP S5487499 A JPS5487499 A JP S5487499A
Authority
JP
Japan
Prior art keywords
frequency
liquid
crystal display
driving
display element
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.)
Pending
Application number
JP15600777A
Other languages
Japanese (ja)
Inventor
Haruo Nakamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP15600777A priority Critical patent/JPS5487499A/en
Publication of JPS5487499A publication Critical patent/JPS5487499A/en
Pending legal-status Critical Current

Links

Landscapes

  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

PURPOSE: To prevent a contrast between selected and unselected effective voltage value rates from lowering in case of many digits, by selecting driving frequencies with positive and negative dielectric anisotropies given for two-frequency dynamic driving.
CONSTITUTION: A torsionally-nematic liquid-crystal display element is used which is made of a liquid-cystal composite body. This liquid-crystal composite body, whose anisotropy of the dielectric constant varies with a frequency, has the positive dielectric anisotropy below frequency (fc) and negative dielectric anisotropy above frequency (fc). Then, this liquid-crystal display element is dynamically driven by a two-frequency method; frequency (fL) of a low frequency component as two- frequency driving is lower than (fc), and frequency (fH) of a high-frequency component is higher than (fc). In addition, a low frequency is applied during an addressing operation to turn on it.
COPYRIGHT: (C)1979,JPO&Japio
JP15600777A 1977-12-23 1977-12-23 Liquid-crystal display unit Pending JPS5487499A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15600777A JPS5487499A (en) 1977-12-23 1977-12-23 Liquid-crystal display unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15600777A JPS5487499A (en) 1977-12-23 1977-12-23 Liquid-crystal display unit

Publications (1)

Publication Number Publication Date
JPS5487499A true JPS5487499A (en) 1979-07-11

Family

ID=15618281

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15600777A Pending JPS5487499A (en) 1977-12-23 1977-12-23 Liquid-crystal display unit

Country Status (1)

Country Link
JP (1) JPS5487499A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6173928A (en) * 1984-09-20 1986-04-16 Matsushita Electric Ind Co Ltd Liquid-crystal driving system
JPS61254932A (en) * 1985-05-07 1986-11-12 Seiko Epson Corp Liquid crystal electrooptic device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6173928A (en) * 1984-09-20 1986-04-16 Matsushita Electric Ind Co Ltd Liquid-crystal driving system
JPH0548886B2 (en) * 1984-09-20 1993-07-22 Matsushita Electric Ind Co Ltd
JPS61254932A (en) * 1985-05-07 1986-11-12 Seiko Epson Corp Liquid crystal electrooptic device

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