JPS5469027A - Liquid crystal driving system - Google Patents

Liquid crystal driving system

Info

Publication number
JPS5469027A
JPS5469027A JP13546477A JP13546477A JPS5469027A JP S5469027 A JPS5469027 A JP S5469027A JP 13546477 A JP13546477 A JP 13546477A JP 13546477 A JP13546477 A JP 13546477A JP S5469027 A JPS5469027 A JP S5469027A
Authority
JP
Japan
Prior art keywords
liquid crystal
state
lamp
duration
signal
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
JP13546477A
Other languages
Japanese (ja)
Other versions
JPS6024958B2 (en
Inventor
Atsushi Motai
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.)
Casio Computer Co Ltd
Original Assignee
Casio Computer Co Ltd
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 Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP52135464A priority Critical patent/JPS6024958B2/en
Publication of JPS5469027A publication Critical patent/JPS5469027A/en
Publication of JPS6024958B2 publication Critical patent/JPS6024958B2/en
Expired legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To avoid deterioration of the effective value of the application voltage at the lamp driving time by varying the pulse duration of the driving voltage according to the state of the load, and thus to hold the normal display state.
CONSTITUTION: Hour and minute display electrode 2 and 3 consisting of the θ -shaped segment electrodes in 2 digits plus colon display electrode 4 are provided on the back of upper electrode substrate 1 at the liquid crystal display part of an electornic watch. At the same time, common electrodes 5W9 are attached to lower electrode substrate 1' which is located oppositely on te back of substrate 1 via the liquid crystal. Dynamic driving signals (c)W(g) are then applied to the liquid crystal display part of such constitution. The chainging state of the liquid crystal driving signal is shown in (a)W(g) when the night illumination lamp is lit up. In addition, switching state of the lamp switch, the driving voltage and the common electrode supply signal to be applied to terminal X or Y are shown in (a), (b) and (c) respectively. The pulse duration of the common signal is set narrower than the time duration of the segment signal by the fixed time duration b under the normal state (no lamp lighting) and then increased up to a fixed duration (a+b) at the lamp lighting time.
COPYRIGHT: (C)1979,JPO&Japio
JP52135464A 1977-11-11 1977-11-11 LCD drive method Expired JPS6024958B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52135464A JPS6024958B2 (en) 1977-11-11 1977-11-11 LCD drive method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52135464A JPS6024958B2 (en) 1977-11-11 1977-11-11 LCD drive method

Publications (2)

Publication Number Publication Date
JPS5469027A true JPS5469027A (en) 1979-06-02
JPS6024958B2 JPS6024958B2 (en) 1985-06-15

Family

ID=15152315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52135464A Expired JPS6024958B2 (en) 1977-11-11 1977-11-11 LCD drive method

Country Status (1)

Country Link
JP (1) JPS6024958B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5792391A (en) * 1980-11-28 1982-06-08 Seiko Instr & Electronics Electronic wrist watch
JPS59222889A (en) * 1983-05-31 1984-12-14 シャープ株式会社 Lquid crystal driving system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62112348U (en) * 1986-01-07 1987-07-17

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5792391A (en) * 1980-11-28 1982-06-08 Seiko Instr & Electronics Electronic wrist watch
JPS59222889A (en) * 1983-05-31 1984-12-14 シャープ株式会社 Lquid crystal driving system

Also Published As

Publication number Publication date
JPS6024958B2 (en) 1985-06-15

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