JPS5559347A - Test system for liquid crystal display element - Google Patents

Test system for liquid crystal display element

Info

Publication number
JPS5559347A
JPS5559347A JP13267178A JP13267178A JPS5559347A JP S5559347 A JPS5559347 A JP S5559347A JP 13267178 A JP13267178 A JP 13267178A JP 13267178 A JP13267178 A JP 13267178A JP S5559347 A JPS5559347 A JP S5559347A
Authority
JP
Japan
Prior art keywords
display element
liquid crystal
crystal display
resistance
amount
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
JP13267178A
Other languages
Japanese (ja)
Inventor
Genji Iwabuchi
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 JP13267178A priority Critical patent/JPS5559347A/en
Publication of JPS5559347A publication Critical patent/JPS5559347A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays

Landscapes

  • Engineering & Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

PURPOSE: To secure an easy, quick and accurate detection for the short circuit and the disconnection of the liquid crystal display element through decision of the quality of the display element by detecting the amount of the current flowing to the liquid crystal display element via the resistance connected to the liquid crystal driving circuit and then comparing the current amount with the reference value.
CONSTITUTION: The pulse delivered from square wave oscillator 19 is applied to driving circuit 20 to drive liquid crystal display element 18. Resistance 21 parallel to capacitor 22 is connected to circuit 20, and the both ends of resistance 21 feature the voltage difference proportional to the amount of the current flowing only to element 18. The voltage difference is applied to deciding unit 26 via differential amplifier 24 to be compared with the reference voltage set at decision reference setter 25. As a result, the short circuit and the disconnection of element 18 can be detected easily, quickly and accurately, and the quality of the display element can be displayed on display unit 27 using the lamp or the like.
COPYRIGHT: (C)1980,JPO&Japio
JP13267178A 1978-10-30 1978-10-30 Test system for liquid crystal display element Pending JPS5559347A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13267178A JPS5559347A (en) 1978-10-30 1978-10-30 Test system for liquid crystal display element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13267178A JPS5559347A (en) 1978-10-30 1978-10-30 Test system for liquid crystal display element

Publications (1)

Publication Number Publication Date
JPS5559347A true JPS5559347A (en) 1980-05-02

Family

ID=15086768

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13267178A Pending JPS5559347A (en) 1978-10-30 1978-10-30 Test system for liquid crystal display element

Country Status (1)

Country Link
JP (1) JPS5559347A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5924265A (en) * 1982-07-31 1984-02-07 Canon Inc Apparatus for measuring current consumption
FR2618562A1 (en) * 1987-07-24 1989-01-27 Nuovo Pignone Spa METHOD FOR THE CONTINUOUS AND AUTOMATIC MONITORING OF ELECTRICAL OPERATION AND CONFORMITY OF THE CONTROL IN A LIQUID CRYSTAL DISPLAY UNIT
WO1995014238A1 (en) * 1993-11-18 1995-05-26 Eev Limited Fault detection arrangement for a liquid crystal display
JP2021092716A (en) * 2019-12-12 2021-06-17 スタンレー電気株式会社 Liquid crystal device and inspection method of liquid crystal device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5924265A (en) * 1982-07-31 1984-02-07 Canon Inc Apparatus for measuring current consumption
FR2618562A1 (en) * 1987-07-24 1989-01-27 Nuovo Pignone Spa METHOD FOR THE CONTINUOUS AND AUTOMATIC MONITORING OF ELECTRICAL OPERATION AND CONFORMITY OF THE CONTROL IN A LIQUID CRYSTAL DISPLAY UNIT
WO1995014238A1 (en) * 1993-11-18 1995-05-26 Eev Limited Fault detection arrangement for a liquid crystal display
JP2021092716A (en) * 2019-12-12 2021-06-17 スタンレー電気株式会社 Liquid crystal device and inspection method of liquid crystal device

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