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CA2521986A1 - A driving and aging extraction scheme for current programmed amoled pixel circuit with no unwanted emission - Google Patents

A driving and aging extraction scheme for current programmed amoled pixel circuit with no unwanted emission Download PDF

Info

Publication number
CA2521986A1
CA2521986A1 CA002521986A CA2521986A CA2521986A1 CA 2521986 A1 CA2521986 A1 CA 2521986A1 CA 002521986 A CA002521986 A CA 002521986A CA 2521986 A CA2521986 A CA 2521986A CA 2521986 A1 CA2521986 A1 CA 2521986A1
Authority
CA
Canada
Prior art keywords
driving
unwanted emission
pixel circuit
amoled pixel
extraction scheme
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.)
Abandoned
Application number
CA002521986A
Other languages
French (fr)
Inventor
Nathan Arokia
Chaji G. Reza
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.)
Ignis Innovation Inc
Original Assignee
Ignis Innovation Inc
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 Ignis Innovation Inc filed Critical Ignis Innovation Inc
Priority to CA002521986A priority Critical patent/CA2521986A1/en
Priority to EP13187593.2A priority patent/EP2688058A3/en
Priority to CA002526782A priority patent/CA2526782C/en
Priority to JP2007545796A priority patent/JP5128287B2/en
Priority to TW094144535A priority patent/TWI402790B/en
Priority to PCT/CA2005/001897 priority patent/WO2006063448A1/en
Priority to EP05819617.1A priority patent/EP1836697B1/en
Priority to CA002590366A priority patent/CA2590366C/en
Priority to EP11168677.0A priority patent/EP2383720B1/en
Priority to KR1020077016146A priority patent/KR20070101275A/en
Priority to US11/304,162 priority patent/US7619597B2/en
Priority to CN2005800480205A priority patent/CN101116129B/en
Publication of CA2521986A1 publication Critical patent/CA2521986A1/en
Priority to US12/571,968 priority patent/US8259044B2/en
Priority to JP2012045806A priority patent/JP5822759B2/en
Priority to US13/568,784 priority patent/US8736524B2/en
Priority to US14/157,031 priority patent/US8994625B2/en
Priority to US14/175,493 priority patent/US8816946B2/en
Priority to JP2014240307A priority patent/JP6086893B2/en
Priority to US14/643,584 priority patent/US9970964B2/en
Priority to US14/738,393 priority patent/US10012678B2/en
Priority to US14/816,817 priority patent/US10013907B2/en
Priority to US16/005,177 priority patent/US10699624B2/en
Priority to US16/914,533 priority patent/US11270621B2/en
Priority to US17/582,446 priority patent/US20220223094A1/en
Abandoned 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G09G3/3241—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G09G2300/0866—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes by means of changes in the pixel supply voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

Disclosed is a technique to reduce the unwanted emission in active matrix light emitting displays, in particular, active matrix organic light emitting diode (AMOLED) displays.
Also, the technique can be adopted in hybrid driving scheme to extract the actual threshold voltage shift/mismatch of the drive transistor.

Description

FIELD OF THE INVENTION
The present invention generally relates to a light emitting display devices, and particularly, to a driving technique for AMOLEDs, to reduce the unwanted emission and extract the precise aging of the pixel circuits.
SUMMARY OF INVENTION
The disclosed technique turns off the light emitting device during the programming/calibration cycle, and so it prevents the unwanted emission and effect of light emitting device on the pixel aging.
ADVANTAGES
The unwanted emission is reduced significantly resulting in a higher resolution. Also, individual extraction of circuit aging and light emitting device aging become possible, leading in a more accurate calibration.

FIG. 1: An example of current mirror pixel circuit.
FIG. 2: Pixel configuration during the calibration/programming cycle.
FIG. 3: Simulation results for the voltage on IDATA line.
Z

The disclosed driving technique can be applied to any current mirror pixel circuit fabricated in any technology including poly silicon, amorphous silicon, crystalline silicon, and organic materials.
FIG.1 shows an example of a current mirror AMOLED pixel circuit. The pixel comprises two switches T3 and T2, a drive transistor T4, a programming transistor T1, OLED
10, and a storage capacitor 11.
In the conventional current programming, SEL goes high, and a programming current (IP) is applied to IDATA. Considering that the width of T1 is 'n' times larger than the width of T4, the current flowing through the OLED 10 during the programming cycle is (n+1)IP.
Since'n' should be large to gain significant speed improvement, the unwanted emission becomes considerable.
In the disclosed driving scheme, VDD goes to a reference voltage during the programming cycle.
The reference voltage should be chosen carefully so that the voltage at node B
becomes smaller than the ON voltage of the OLED 10. As a result, the OLED 10 turns off and the unwanted emission is zero. FIG. 2 shows the pixel configuration at this cycle. Here, the voltage of the IDATA line consists of VP+VT+ 4VT where VP includes the drain-source voltage of T4 and the gate-source voltage of T1, VT is the threshold voltage of Tl (T4), and ~VT is the VT
shift/mismatch. At the end of programming cycle, VDD goes to its original value, and so voltage at node B goes to VpLED~ However, the gate voltage of T4/T1 is fixed and stored in the storage capacitor 11 since the switches are OFF. Therefore, the pixel current during the driving cycle becomes independent of the VT.
More importantly, this method can be adopted in hybrid driving scheme to extract the VT-shift or VT-mismatch. It is obvious that the only variant parameter in the voltage of the IDATA line is the VT shift/mismatch. Therefore, OVT can be extracted and the programming data can be calibrated with 4VT.
The simulation result for the voltage on IDATA line for different VT is depicted in FIG. 3. As is can be seen, the voltage of IDATA line includes the shift in the threshold voltage of T1 and T4.
Here, the programming current is 1 ~A.

Claims
CA002521986A 2004-12-15 2005-10-17 A driving and aging extraction scheme for current programmed amoled pixel circuit with no unwanted emission Abandoned CA2521986A1 (en)

Priority Applications (24)

Application Number Priority Date Filing Date Title
CA002521986A CA2521986A1 (en) 2005-10-17 2005-10-17 A driving and aging extraction scheme for current programmed amoled pixel circuit with no unwanted emission
CN2005800480205A CN101116129B (en) 2004-12-15 2005-12-15 Method and system for programming, calibrating and driving a light emitting device display
US11/304,162 US7619597B2 (en) 2004-12-15 2005-12-15 Method and system for programming, calibrating and driving a light emitting device display
JP2007545796A JP5128287B2 (en) 2004-12-15 2005-12-15 Method and system for performing real-time calibration for display arrays
TW094144535A TWI402790B (en) 2004-12-15 2005-12-15 Method and system for programming, calibrating and driving a light emitting device display
PCT/CA2005/001897 WO2006063448A1 (en) 2004-12-15 2005-12-15 Method and system for programming, calibrating and driving a light emitting device display
EP05819617.1A EP1836697B1 (en) 2004-12-15 2005-12-15 Method and system for programming, calibrating and driving a light emitting device display
CA002590366A CA2590366C (en) 2004-12-15 2005-12-15 Method and system for programming, calibrating and driving a light emitting device display
EP11168677.0A EP2383720B1 (en) 2004-12-15 2005-12-15 Method and system for programming, calibrating and driving a light emitting device display
KR1020077016146A KR20070101275A (en) 2004-12-15 2005-12-15 Methods and systems for programming, calibrating, and driving light emitting devices
CA002526782A CA2526782C (en) 2004-12-15 2005-12-15 Method and system for programming, calibrating and driving a light emitting device display
EP13187593.2A EP2688058A3 (en) 2004-12-15 2005-12-15 Method and system for programming, calibrating and driving a light emitting device display
US12/571,968 US8259044B2 (en) 2004-12-15 2009-10-01 Method and system for programming, calibrating and driving a light emitting device display
JP2012045806A JP5822759B2 (en) 2004-12-15 2012-03-01 System for display array
US13/568,784 US8736524B2 (en) 2004-12-15 2012-08-07 Method and system for programming, calibrating and driving a light emitting device display
US14/157,031 US8994625B2 (en) 2004-12-15 2014-01-16 Method and system for programming, calibrating and driving a light emitting device display
US14/175,493 US8816946B2 (en) 2004-12-15 2014-02-07 Method and system for programming, calibrating and driving a light emitting device display
JP2014240307A JP6086893B2 (en) 2004-12-15 2014-11-27 Method for extracting circuit parameters
US14/643,584 US9970964B2 (en) 2004-12-15 2015-03-10 Method and system for programming, calibrating and driving a light emitting device display
US14/738,393 US10012678B2 (en) 2004-12-15 2015-06-12 Method and system for programming, calibrating and/or compensating, and driving an LED display
US14/816,817 US10013907B2 (en) 2004-12-15 2015-08-03 Method and system for programming, calibrating and/or compensating, and driving an LED display
US16/005,177 US10699624B2 (en) 2004-12-15 2018-06-11 Method and system for programming, calibrating and/or compensating, and driving an LED display
US16/914,533 US11270621B2 (en) 2004-12-15 2020-06-29 Method and system for programming, calibrating and/or compensating, and driving an LED display
US17/582,446 US20220223094A1 (en) 2004-12-15 2022-01-24 Method and system for programming, calibrating and/or compensating, and driving an led display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002521986A CA2521986A1 (en) 2005-10-17 2005-10-17 A driving and aging extraction scheme for current programmed amoled pixel circuit with no unwanted emission

Publications (1)

Publication Number Publication Date
CA2521986A1 true CA2521986A1 (en) 2007-04-17

Family

ID=37951520

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002521986A Abandoned CA2521986A1 (en) 2004-12-15 2005-10-17 A driving and aging extraction scheme for current programmed amoled pixel circuit with no unwanted emission

Country Status (1)

Country Link
CA (1) CA2521986A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102467877A (en) * 2010-11-05 2012-05-23 胜华科技股份有限公司 Light emitting element drive circuit
CN108538242A (en) * 2018-01-26 2018-09-14 上海天马有机发光显示技术有限公司 Pixel-driving circuit and its driving method, display panel and display device
CN114708828A (en) * 2022-04-29 2022-07-05 深圳市华星光电半导体显示技术有限公司 Pixel circuit and display panel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102467877A (en) * 2010-11-05 2012-05-23 胜华科技股份有限公司 Light emitting element drive circuit
CN102467877B (en) * 2010-11-05 2014-07-23 胜华科技股份有限公司 Light emitting element drive circuit
CN108538242A (en) * 2018-01-26 2018-09-14 上海天马有机发光显示技术有限公司 Pixel-driving circuit and its driving method, display panel and display device
CN114708828A (en) * 2022-04-29 2022-07-05 深圳市华星光电半导体显示技术有限公司 Pixel circuit and display panel

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FZDE Dead