JPS5492081A - Driving method of thin film el element - Google Patents

Driving method of thin film el element

Info

Publication number
JPS5492081A
JPS5492081A JP16086877A JP16086877A JPS5492081A JP S5492081 A JPS5492081 A JP S5492081A JP 16086877 A JP16086877 A JP 16086877A JP 16086877 A JP16086877 A JP 16086877A JP S5492081 A JPS5492081 A JP S5492081A
Authority
JP
Japan
Prior art keywords
picture element
voltage
time
writing
light emission
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
JP16086877A
Other languages
Japanese (ja)
Other versions
JPS62509B2 (en
Inventor
Sumio Kita
Matsuhiko Hirano
Shinobu Shiotani
Kichi Hatta
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP16086877A priority Critical patent/JPS5492081A/en
Publication of JPS5492081A publication Critical patent/JPS5492081A/en
Publication of JPS62509B2 publication Critical patent/JPS62509B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Control Of El Displays (AREA)

Abstract

PURPOSE:To control the charging voltage of the writing picture element by controlling the costant current supply time for the writing picture element in accordance with the video signal. CONSTITUTION:Selector switch Sxi of the data side is turned on only for the time according to the degree of modulation, and the voltage proportional to the on-time is applied to writing picture element M(ij). In short, Sxi is the constant current element. Here, Vs - Vp + I.ti/nC is applied to M with control of ti, where the current is referred to as I, the on-time is ti, the electrostatic capacity is C per picture element, the number of the scan electrode is n, the writing voltage is Vs and the clamping voltage Vp respectively. And the pulses of different amplitudes are applied to the EL element with application of Vr and the bipolar pulse at the refresh time, thus ensuring the light emission in the luminance equivalent to the voltage of the amplitude average value. In this case, ti is decided so that 1/2 the toatal sum of the above voltage may be the necessary luminance. The time during which the selected picture element turns to Vs becomes constant regardless of the data quantity if Vs - Vp is charged previously to all picture elements on scan electrode Y. And no light emission is obtained for the semi-selected picture element if Vs is selected properly.
JP16086877A 1977-12-28 1977-12-28 Driving method of thin film el element Granted JPS5492081A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16086877A JPS5492081A (en) 1977-12-28 1977-12-28 Driving method of thin film el element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16086877A JPS5492081A (en) 1977-12-28 1977-12-28 Driving method of thin film el element

Publications (2)

Publication Number Publication Date
JPS5492081A true JPS5492081A (en) 1979-07-20
JPS62509B2 JPS62509B2 (en) 1987-01-08

Family

ID=15724097

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16086877A Granted JPS5492081A (en) 1977-12-28 1977-12-28 Driving method of thin film el element

Country Status (1)

Country Link
JP (1) JPS5492081A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6121943A (en) * 1995-07-04 2000-09-19 Denso Corporation Electroluminescent display with constant current control circuits in scan electrode circuit
JP2005526291A (en) * 2002-05-16 2005-09-02 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ Discharge of light emitting device capacitance by limited current

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6121943A (en) * 1995-07-04 2000-09-19 Denso Corporation Electroluminescent display with constant current control circuits in scan electrode circuit
JP2005526291A (en) * 2002-05-16 2005-09-02 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ Discharge of light emitting device capacitance by limited current

Also Published As

Publication number Publication date
JPS62509B2 (en) 1987-01-08

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