JPS54116197A - Liquid crystal display unit - Google Patents

Liquid crystal display unit

Info

Publication number
JPS54116197A
JPS54116197A JP2390478A JP2390478A JPS54116197A JP S54116197 A JPS54116197 A JP S54116197A JP 2390478 A JP2390478 A JP 2390478A JP 2390478 A JP2390478 A JP 2390478A JP S54116197 A JPS54116197 A JP S54116197A
Authority
JP
Japan
Prior art keywords
frequency
fed
selection
liquid crystal
δεh
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
JP2390478A
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 JP2390478A priority Critical patent/JPS54116197A/en
Publication of JPS54116197A publication Critical patent/JPS54116197A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To obtain excellent contrast without no realtion to the number of digits, by driving two frequency dynamic method for the display unit using the liquid crystal caried with frequency for the anisotropy of dielectric constant.
CONSTITUTION: When the anisotropy of dielectric constant has positive value ΔεL at lower frequency than the frequency fx and negative value ΔεH at higher frequency than fc, if the absolute value of ΔεH/(ΔεL+ΔεH) is greater, the value of the ratio of the effective voltage at selection condition to that non-selective condition VON/VOFF is greater, obtaining excellent contrast. Each frequency is selected so that this can be satisfied, and rectangular wave Ao at addressing (at selection) is fed at timing signal and low frequency Bo is fed at non-selection, and when CON and COFF are respectively fed as the data signal at ON and OFF in phase or opposite phase to the wave form Ao, the voltage FON(R-CON), FOFF (R-COFF) is fed to the liquid crystal video element, high harmonic is fed at selection causing OFF state and ON state is caused at non-selection.
COPYRIGHT: (C)1979,JPO&Japio
JP2390478A 1978-03-01 1978-03-01 Liquid crystal display unit Pending JPS54116197A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2390478A JPS54116197A (en) 1978-03-01 1978-03-01 Liquid crystal display unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2390478A JPS54116197A (en) 1978-03-01 1978-03-01 Liquid crystal display unit

Publications (1)

Publication Number Publication Date
JPS54116197A true JPS54116197A (en) 1979-09-10

Family

ID=12123444

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2390478A Pending JPS54116197A (en) 1978-03-01 1978-03-01 Liquid crystal display unit

Country Status (1)

Country Link
JP (1) JPS54116197A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967592A (en) * 1982-10-06 1984-04-17 セイコーインスツルメンツ株式会社 Display unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967592A (en) * 1982-10-06 1984-04-17 セイコーインスツルメンツ株式会社 Display unit

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