GB2036403A - Circuit for driving electro- optical display unit - Google Patents

Circuit for driving electro- optical display unit

Info

Publication number
GB2036403A
GB2036403A GB7934451A GB7934451A GB2036403A GB 2036403 A GB2036403 A GB 2036403A GB 7934451 A GB7934451 A GB 7934451A GB 7934451 A GB7934451 A GB 7934451A GB 2036403 A GB2036403 A GB 2036403A
Authority
GB
United Kingdom
Prior art keywords
pulse train
circuit
display unit
divided
electrodes
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.)
Withdrawn
Application number
GB7934451A
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.)
Hitachi Ltd
Original Assignee
Hitachi 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
Priority claimed from JP1243978A external-priority patent/JPS54106261A/en
Priority claimed from JP1347378A external-priority patent/JPS54107296A/en
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB2036403A publication Critical patent/GB2036403A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/40—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect
    • G01R13/404—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for discontinuous display, i.e. display of discrete values
    • G01R13/407—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for discontinuous display, i.e. display of discrete values using a plurality of passive display elements, e.g. liquid crystal or Kerr-effect display elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/40—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect
    • G01R13/404—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for discontinuous display, i.e. display of discrete values
    • G01R13/405—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for discontinuous display, i.e. display of discrete values using a plurality of active, i.e. light emitting, e.g. electro-luminescent elements, i.e. bar graphs

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

A circuit for driving a liquid crystal bar graph display unit has a major object to provide a circuit of simple construction, which may be used even when the numbers of block electrodes and segment electrodes are altered. In order to perform this object, the analog value of an input signal is converted to a pulse train of the number proportional to the analog value of the input signal. This pulse train is further divided in frequency by n (where n represents the number of segments per one block) so as to form the pulse train of l/n as compared with the original pulse train. The voltage to be applied to the segment electrodes is further selected in response to the original pulse train and the number of pulses divided in frequency into l/n, and the voltage to be applied to the block electrodes is selected in response to the number of pulses thus divided as above. <IMAGE>
GB7934451A 1978-02-08 1979-02-02 Circuit for driving electro- optical display unit Withdrawn GB2036403A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1243978A JPS54106261A (en) 1978-02-08 1978-02-08 Bar graph display device
JP1347378A JPS54107296A (en) 1978-02-10 1978-02-10 Display unit for bar graph

Publications (1)

Publication Number Publication Date
GB2036403A true GB2036403A (en) 1980-06-25

Family

ID=26348062

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7934451A Withdrawn GB2036403A (en) 1978-02-08 1979-02-02 Circuit for driving electro- optical display unit

Country Status (2)

Country Link
GB (1) GB2036403A (en)
WO (1) WO1979000676A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056430A2 (en) * 1981-01-19 1982-07-28 Siemens Aktiengesellschaft Procedure for driving a liquid crystal rising bar graph display
EP0058756A1 (en) * 1981-01-26 1982-09-01 Siemens Aktiengesellschaft Monolithic integrated control circuit for a nematic display unit, in particular a bar graph display
DE3151627A1 (en) * 1981-12-28 1983-07-07 SWF-Spezialfabrik für Autozubehör Gustav Rau GmbH, 7120 Bietigheim-Bissingen Switching arrangement for an instrument with an electro-optical display unit, particularly for motor vehicles

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5229938B2 (en) * 1972-08-12 1977-08-04
JPS5346420B2 (en) * 1973-04-21 1978-12-13
JPS51149797A (en) * 1974-04-13 1976-12-22 Sankurutsukusu Kenkyusho:Kk Display unit using field light emission and receining elements

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056430A2 (en) * 1981-01-19 1982-07-28 Siemens Aktiengesellschaft Procedure for driving a liquid crystal rising bar graph display
EP0056430A3 (en) * 1981-01-19 1982-08-25 Siemens Aktiengesellschaft Procedure for driving a liquid crystal rising bar graph display
EP0058756A1 (en) * 1981-01-26 1982-09-01 Siemens Aktiengesellschaft Monolithic integrated control circuit for a nematic display unit, in particular a bar graph display
DE3151627A1 (en) * 1981-12-28 1983-07-07 SWF-Spezialfabrik für Autozubehör Gustav Rau GmbH, 7120 Bietigheim-Bissingen Switching arrangement for an instrument with an electro-optical display unit, particularly for motor vehicles

Also Published As

Publication number Publication date
WO1979000676A1 (en) 1979-09-20

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)