CA2508972A1 - New timing schedule for stable operation of amoled displays - Google Patents

New timing schedule for stable operation of amoled displays Download PDF

Info

Publication number
CA2508972A1
CA2508972A1 CA002508972A CA2508972A CA2508972A1 CA 2508972 A1 CA2508972 A1 CA 2508972A1 CA 002508972 A CA002508972 A CA 002508972A CA 2508972 A CA2508972 A CA 2508972A CA 2508972 A1 CA2508972 A1 CA 2508972A1
Authority
CA
Canada
Prior art keywords
timing schedule
stable operation
vt
new timing
amoled displays
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
CA002508972A
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 CA002508972A priority Critical patent/CA2508972A1/en
Priority claimed from TW095120426A external-priority patent/TW200707376A/en
Priority claimed from CA002549722A external-priority patent/CA2549722C/en
Publication of CA2508972A1 publication Critical patent/CA2508972A1/en
Application status is Abandoned legal-status Critical

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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]
    • G09G3/3225Control 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
    • G09G3/3233Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active 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
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0819Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active 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
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0852Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active 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
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861Several 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0262The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/04Maintaining the quality of display appearance
    • G09G2320/043Preventing or counteracting the effects of ageing

Abstract

Disclosed is a technique for driving technique to increase the accuracy in the AMOLED
voltage programmed pixel circuits.

Description

FIELD OF THE INVENTION
The present invention generally relates to a light emitting device display, and more particularly, to a driving technique of the active matrix organic light emitting diode (AMOLED), and the enhancement of OLED brightness stability by using compensation.
SUMMARY OF INVENTION
The invention provides the enough time for the pixel circuit to generate an accurate threshold voltage of the drive TFT. As a result, it generate a very stable current despite the pixel aging BRIEF DESCRIPTION OF THE DRAWINGS
FIG.1 is timing diagrams for AMOLED displays: (a) conventional, (b) segmented, and (c) parallel.
FIG. 2 shows two VPPCs based on segmented and parallel scheduling: (a) 3-TFT
circuit and (b) bootstrapped circuit.

For the voltage-programmed AMOLED display, the operating cycles are the compensation voltage generation, VT-generation, current-regulation, and driving cycles.
Typically, these operating cycles are performed sequentially for a matrix structure, as indicated in FIG.1 (a). For example, the entire programming cycles of the first row are executed, and then the second row is programmed. Since the VT-generation cycle requires a large timing budget to generate an accurate VT, this timing schedule cannot be adopted in large-area displays.
FIG.1 (b) is the new timing schedule that extends the timing budget of the VT-generation cycle without affecting the programming time. To achieve that, the rows in the AMOLED are categorized as few segments. The programming of each segment starts with executing the first and second operating cycles. After that, the current-calibration cycle is preformed for the entire segment. As a result, the timing budget of the VT-generation cycle is extended to j.iP where j is the number of rows in each segment, and iP
is the timing budget of the first operating cycle. Also, the frame time (iF) is 2n.iP where n is the number of rows in the display. As a result, iP is twice as small as the one in the conventional 2-TFT matrix. Also, this timing schedule cannot be applied to the new 2-TFT pixel without a few modifications.
The other timing schedule, displayed in FIG.1 (c), extends the timing budget of the VT-generation cycle, whereas iP is preserved as iF/n. The current-regulation cycle of each segment is preformed in parallel with the first operating cycles of the next segment.
However, the pixel circuit must be able to support the parallel operation.
FIG. 2 shows the modified pixel circuits that can support the new timing schedules.
In the circuit in FIG.2 (a), storage capacitor is charge to a negative voltage (-V~omp) during the first operating cycle while the gate voltage is zero. During the second operating cycle node B is charge up to -VT. It is obvious that this cycle can be done without affecting the data line, so that the other operating cycle can be executed for the other rows. During the third operating cycle, node A is charged to a programming voltage resulting in VGS=VP+VT. It is evident that this pixel can be used with both the segmented and parallel timing schedule.

The pixel in FIG.2 (b), however, employs bootstrapping effect to add a programming voltage to the stored VT. During the first operating cycle, node A is charged to a compensating voltage, VDp-VOLED~ and node B is discharged to ground. During the second operating cycle, voltage at node A changes to the VT of T1. The current regulation occurs in the third operating cycle during which node B is charge to a programming voltage so that node A changes to Vp+VT. It is obvious that this pixel circuit has the capability of adopting both segmented and parallel timing schedule.

Claims

CA002508972A 2005-06-08 2005-06-08 New timing schedule for stable operation of amoled displays Abandoned CA2508972A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002508972A CA2508972A1 (en) 2005-06-08 2005-06-08 New timing schedule for stable operation of amoled displays

Applications Claiming Priority (17)

Application Number Priority Date Filing Date Title
CA002508972A CA2508972A1 (en) 2005-06-08 2005-06-08 New timing schedule for stable operation of amoled displays
TW095120426A TW200707376A (en) 2005-06-08 2006-06-08 Method and system for driving a light emitting device display
CA002549722A CA2549722C (en) 2005-06-08 2006-06-08 Method and system for driving a light emitting device display
CN201210152425.5A CN102663977B (en) 2005-06-08 2006-06-08 For driving the method and system of light emitting device display
JP2008515013A JP5355080B2 (en) 2005-06-08 2006-06-08 Method and system for driving a light emitting device display
EP20060752777 EP1904995A4 (en) 2005-06-08 2006-06-08 Method and system for driving a light emitting device display
CN 200680026953 CN101228569B (en) 2005-06-08 2006-06-08 Method and system for driving a light emitting device display
US11/449,487 US7852298B2 (en) 2005-06-08 2006-06-08 Method and system for driving a light emitting device display
KR1020087000382A KR20080032072A (en) 2005-06-08 2006-06-08 Method and system for driving a light emitting device display
PCT/CA2006/000941 WO2006130981A1 (en) 2005-06-08 2006-06-08 Method and system for driving a light emitting device display
US12/893,148 US8860636B2 (en) 2005-06-08 2010-09-29 Method and system for driving a light emitting device display
JP2013138321A JP2013190829A (en) 2005-06-08 2013-07-01 Method and system for driving light emitting device display
JP2014133475A JP6207472B2 (en) 2005-06-08 2014-06-30 Method and system for driving a light emitting device display
JP2014154749A JP2014240972A (en) 2005-06-08 2014-07-30 Method and system for driving light emitting device display
US14/481,370 US9330598B2 (en) 2005-06-08 2014-09-09 Method and system for driving a light emitting device display
US15/090,769 US9805653B2 (en) 2005-06-08 2016-04-05 Method and system for driving a light emitting device display
US15/717,043 US10388221B2 (en) 2005-06-08 2017-09-27 Method and system for driving a light emitting device display

Publications (1)

Publication Number Publication Date
CA2508972A1 true CA2508972A1 (en) 2006-12-08

Family

ID=37545621

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002508972A Abandoned CA2508972A1 (en) 2005-06-08 2005-06-08 New timing schedule for stable operation of amoled displays

Country Status (2)

Country Link
CN (1) CN101228569B (en)
CA (1) CA2508972A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105741770A (en) * 2016-04-25 2016-07-06 广东欧珀移动通信有限公司 Light emitting control method of light emitting element, light emitting control device and mobile terminal
CN105741769A (en) * 2016-04-25 2016-07-06 广东欧珀移动通信有限公司 Display screen adjusting method, display screen adjusting device and terminal
CN105913800A (en) * 2016-04-25 2016-08-31 广东欧珀移动通信有限公司 Optical sensor based display control method, apparatus and intelligent terminal

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006130981A1 (en) 2005-06-08 2006-12-14 Ignis Innovation Inc. Method and system for driving a light emitting device display
KR101269000B1 (en) 2008-12-24 2013-05-29 엘지디스플레이 주식회사 Organic electro-luminescent display device and driving method thereof
CN103003864B (en) * 2010-07-12 2015-04-01 夏普株式会社 Display device and method for driving same
CN101976545A (en) * 2010-10-26 2011-02-16 华南理工大学 Pixel drive circuit of OLED (Organic Light Emitting Diode) display and drive method thereof
CN101986378A (en) * 2010-11-09 2011-03-16 华南理工大学 Pixel driving circuit for active organic light-emitting diode (OLED) display and driving method thereof
CN103258501B (en) * 2013-05-21 2015-02-25 京东方科技集团股份有限公司 Pixel circuit and driving method thereof
JP2016062076A (en) 2014-09-22 2016-04-25 Nltテクノロジー株式会社 Pixel circuit, method for driving the same and display device
JP2016075836A (en) * 2014-10-08 2016-05-12 Nltテクノロジー株式会社 Pixel circuit, method for driving the pixel circuit, and display device
CN107068053B (en) * 2017-02-21 2019-07-09 京东方科技集团股份有限公司 Compensation data method and compensation device, the display device of OLED display

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3221085B2 (en) 1992-09-14 2001-10-22 富士ゼロックス株式会社 Parallel processor
JP3767877B2 (en) 1997-09-29 2006-04-19 サーノフ コーポレーション Active matrix light emitting diode pixel structure and method thereof
JP3800050B2 (en) 2001-08-09 2006-07-19 日本電気株式会社 Display device drive circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105741770A (en) * 2016-04-25 2016-07-06 广东欧珀移动通信有限公司 Light emitting control method of light emitting element, light emitting control device and mobile terminal
CN105741769A (en) * 2016-04-25 2016-07-06 广东欧珀移动通信有限公司 Display screen adjusting method, display screen adjusting device and terminal
CN105913800A (en) * 2016-04-25 2016-08-31 广东欧珀移动通信有限公司 Optical sensor based display control method, apparatus and intelligent terminal
CN105913800B (en) * 2016-04-25 2018-09-04 广东欧珀移动通信有限公司 A kind of display control method, device and intelligent terminal based on optical sensor
CN105741770B (en) * 2016-04-25 2019-04-19 Oppo广东移动通信有限公司 A kind of light-emitting control method of light-emitting component, device and mobile terminal

Also Published As

Publication number Publication date
CN101228569B (en) 2012-07-04
CN101228569A (en) 2008-07-23

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