JPS57179724A - Method and device for measuring response speed for liquid crystal element - Google Patents

Method and device for measuring response speed for liquid crystal element

Info

Publication number
JPS57179724A
JPS57179724A JP56066375A JP6637581A JPS57179724A JP S57179724 A JPS57179724 A JP S57179724A JP 56066375 A JP56066375 A JP 56066375A JP 6637581 A JP6637581 A JP 6637581A JP S57179724 A JPS57179724 A JP S57179724A
Authority
JP
Japan
Prior art keywords
liquid crystal
signal
crystal element
voltage
change
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
JP56066375A
Other languages
Japanese (ja)
Inventor
Kazuyuki Funahata
Keiji Nagae
Akio Kobi
Norimasa Kamezawa
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
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56066375A priority Critical patent/JPS57179724A/en
Publication of JPS57179724A publication Critical patent/JPS57179724A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

PURPOSE:To measure the response speed of a liquid crystal element accurately by detecting the change in the configuration of the liquid crystal molecules in said element as a change of the electric capacity of the element with time. CONSTITUTION:The signal VA generated from a driving signal generating circuit 10 is made into a signal VC by a zero cross switching circuit 12, and its rising part is relieved by a lower pass filter 13, whereby it is made into an AC voltage signal VD for driving. The AC voltage signal VB for measurement generated from a measuring signal generating circuit 11 is sinusoidal and is of the voltage value that does not affect the driving state of a liquid crystal element. The signals VD, VB are added by an adder 14, and the combined voltage signal VE is applied to a voltage dividing circuit 100 consisting of a liquid crystal element 15 and a capacitor 16. When the signal VD is applied at the time t0, the configration direction of the liquid crystal molecules in the liquid crystal element changes, and the electric capacity of the element 15 changes. If the AC voltage signal components for measurement of the signal VF applied to the capacitor 16 are detected by a discriminating circuit 17, the change of the liquid crystal molecules with time is detected.
JP56066375A 1981-04-30 1981-04-30 Method and device for measuring response speed for liquid crystal element Pending JPS57179724A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56066375A JPS57179724A (en) 1981-04-30 1981-04-30 Method and device for measuring response speed for liquid crystal element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56066375A JPS57179724A (en) 1981-04-30 1981-04-30 Method and device for measuring response speed for liquid crystal element

Publications (1)

Publication Number Publication Date
JPS57179724A true JPS57179724A (en) 1982-11-05

Family

ID=13314012

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56066375A Pending JPS57179724A (en) 1981-04-30 1981-04-30 Method and device for measuring response speed for liquid crystal element

Country Status (1)

Country Link
JP (1) JPS57179724A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100350304C (en) * 2005-04-19 2007-11-21 浙江大学 Liquid crystal display response time electrooptical automatic measuring instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100350304C (en) * 2005-04-19 2007-11-21 浙江大学 Liquid crystal display response time electrooptical automatic measuring instrument

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