CA2503283A1 - Method for scaled current programming of amoled displays - Google Patents

Method for scaled current programming of amoled displays Download PDF

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Publication number
CA2503283A1
CA2503283A1 CA 2503283 CA2503283A CA2503283A1 CA 2503283 A1 CA2503283 A1 CA 2503283A1 CA 2503283 CA2503283 CA 2503283 CA 2503283 A CA2503283 A CA 2503283A CA 2503283 A1 CA2503283 A1 CA 2503283A1
Authority
CA
Canada
Prior art keywords
current
programming
amoled displays
current programming
amoled
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
CA 2503283
Other languages
French (fr)
Inventor
Nathan Arokia
Chaji G. Reza
Servati Peyman
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 CA 2503283 priority Critical patent/CA2503283A1/en
Priority to CN2005800464787A priority patent/CN101111880B/en
Priority to CA002523841A priority patent/CA2523841C/en
Priority to EP11175225.9A priority patent/EP2383721B1/en
Priority to EP05807905A priority patent/EP1825455A4/en
Priority to PCT/CA2005/001730 priority patent/WO2006053424A1/en
Priority to US11/274,957 priority patent/US7889159B2/en
Priority to JP2007541598A priority patent/JP2008521033A/en
Priority to TW094140360A priority patent/TWI389085B/en
Publication of CA2503283A1 publication Critical patent/CA2503283A1/en
Priority to US12/952,951 priority patent/US8319712B2/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
    • 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
    • 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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed

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)
  • Electroluminescent Light Sources (AREA)

Abstract

Disclosed is a technique for fast programming of the current cell and/or current mirror circuits, in particular current-programmed active matrix organic light emitting diode (AMOLED) displays.

Description

FIELD OF THE INVENTION
The present invention generally relates to a light emitting device displays, and particularly, to a driving technique for AMOLED. The present technique enhances the settling time of the current-programmed AMOLED displays.
BACKGROUND OF INVENTION
The small current required by the OLEDs coupled with a large parasitic capacitance increases the settling time of the programming of the current-programmed AMOLED displays.
More importantly, design of external driver supplying that current is very challenging and impractical.
For example, in the CMOS technology, the transistors must work in sub-threshold regime to provide the small current required by the OLEDs. Therefore, to use current-programmed AMOLED pixel circuits, suitable driving schemes are desirable.
Current scaling is one method that can be used to manage the challenges associated with the small current required by the OLEDs. In the current mirror pixel circuit, the current scaling can be done by resizing the mirror transistors. If the size of the drive transistor is smaller than the size of the other mirror transistor, the current passing through the OLED is scaled down. However, this method is not applicable for other current-programmed pixel circuits.
Also, by resizing the two mirror transistors the effect of mismatch increases.
SUMMARY OF INVENTION
This invention provides a simple current programming technique, suitable for the use in AMOLED displays. Despite the other current scaling technique, resizing is not required in the new technique, resulting in a better matching between two mirror transistors in the current-mirror pixel circuits.

FIG. 1 current scaling in a current-mirror pixel circuit with virtual-ground technique.

FIG. 1 shows a current-mirror pixel circuit with the new current scaling technique as an example.
Here, T3, T4 are the switch network, 10. During the programming cycle T3 and T4 are ON. A
current equal to (IB+IP) is passing through T3 and T4, and the gate-source voltage of T1 is self adjusted to ( Ip SIB + YT ) where VT is the threshold voltage of the drive transistor, Tl. Here, IP
is the programming current, and IB the bias current. However, the voltage stored in the storage IP + IB - YB + YT . Since the source of T2 is connected to VGND, the capacitance, 11, is VAS = , current flowing through the OLED during the programming time is IP;Xer = IP + IB + ~.Yez - 2~ ~ VB ~ (IP + IB) If IB » IP, we can rewrite the pixel current as IP~er = Ir + (Ie +,(3.VB2 - 2~ ~ VB ~ IB ) By choosing VB properly (VB= ~ ), the pixel current becomes equal to the programming current (IP). Therefore, it avoids unwanted emission during the programming cycle.
During the driving cycle, VGND is zero, so that the gate-source voltage of Tl (T2) becomes equal to Vas. Therefore, the current of the pixel is given by Ipixel = Ip + IB + ~3.YB2 - 2~ ~ YB ~ (IP + IB) .
If IB » IP, we can rewrite the pixel current as z IP~er = Ir + (Ie +,Q.VB - 2~ ~ VB ~ Ia ) By choosing VB properly (VB= ~ ), the pixel current becomes equal to the programming current (IP).

Claims
CA 2503283 2004-11-16 2005-04-08 Method for scaled current programming of amoled displays Abandoned CA2503283A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
CA 2503283 CA2503283A1 (en) 2005-04-08 2005-04-08 Method for scaled current programming of amoled displays
PCT/CA2005/001730 WO2006053424A1 (en) 2004-11-16 2005-11-15 System and driving method for active matrix light emitting device display
CA002523841A CA2523841C (en) 2004-11-16 2005-11-15 System and driving method for active matrix light emitting device display
EP11175225.9A EP2383721B1 (en) 2004-11-16 2005-11-15 System and Driving Method for Active Matrix Light Emitting Device Display
EP05807905A EP1825455A4 (en) 2004-11-16 2005-11-15 System and driving method for active matrix light emitting device display
CN2005800464787A CN101111880B (en) 2004-11-16 2005-11-15 System and driving method for active matrix light emitting device display
US11/274,957 US7889159B2 (en) 2004-11-16 2005-11-15 System and driving method for active matrix light emitting device display
JP2007541598A JP2008521033A (en) 2004-11-16 2005-11-15 System and driving method for active matrix light emitting device display
TW094140360A TWI389085B (en) 2004-11-16 2005-11-16 System and driving method for active matrix light emitting device display
US12/952,951 US8319712B2 (en) 2004-11-16 2010-11-23 System and driving method for active matrix light emitting device display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2503283 CA2503283A1 (en) 2005-04-08 2005-04-08 Method for scaled current programming of amoled displays

Publications (1)

Publication Number Publication Date
CA2503283A1 true CA2503283A1 (en) 2006-10-08

Family

ID=37101403

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2503283 Abandoned CA2503283A1 (en) 2004-11-16 2005-04-08 Method for scaled current programming of amoled displays

Country Status (1)

Country Link
CA (1) CA2503283A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10192485B2 (en) 2016-01-04 2019-01-29 Boe Technology Group Co., Ltd. Pixel compensation circuit and AMOLED display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10192485B2 (en) 2016-01-04 2019-01-29 Boe Technology Group Co., Ltd. Pixel compensation circuit and AMOLED display device

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