CA2551237A1 - Stable driving scheme for amoled displays using feedback elements - Google Patents

Stable driving scheme for amoled displays using feedback elements Download PDF

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Publication number
CA2551237A1
CA2551237A1 CA002551237A CA2551237A CA2551237A1 CA 2551237 A1 CA2551237 A1 CA 2551237A1 CA 002551237 A CA002551237 A CA 002551237A CA 2551237 A CA2551237 A CA 2551237A CA 2551237 A1 CA2551237 A1 CA 2551237A1
Authority
CA
Canada
Prior art keywords
pixel
sensor
voltage
aging
driving 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
CA002551237A
Other languages
French (fr)
Inventor
Arokia Nathan
G. Reza Chaji
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 CA002551237A priority Critical patent/CA2551237A1/en
Priority to EP07701644.2A priority patent/EP1971975B1/en
Priority to CA 2570898 priority patent/CA2570898C/en
Priority to EP12156251.6A priority patent/EP2458579B1/en
Priority to KR1020087019498A priority patent/KR20090006057A/en
Priority to JP2008549724A priority patent/JP5164857B2/en
Priority to PCT/CA2007/000013 priority patent/WO2007079572A1/en
Priority to CN2007800077270A priority patent/CN101395653B/en
Priority to TW096100837A priority patent/TWI415067B/en
Priority to US11/651,099 priority patent/US8253665B2/en
Publication of CA2551237A1 publication Critical patent/CA2551237A1/en
Priority to US13/243,330 priority patent/US8564513B2/en
Priority to US13/413,517 priority patent/US8624808B2/en
Priority to US13/649,888 priority patent/US9269322B2/en
Priority to US14/095,583 priority patent/US9058775B2/en
Priority to US14/491,885 priority patent/US10229647B2/en
Priority to US14/993,174 priority patent/US9489891B2/en
Priority to US15/288,019 priority patent/US10262587B2/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
    • 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
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G09G2360/147—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel
    • G09G2360/148—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel the light being detected by light detection means within each pixel

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 provide a stable AMOLED display to deal with instability of backplane and OLED, using a sensor element which provides feedback by optical, thermal, or other means of transduction.

Description

Applicant: Ignis Innovation Inc.

Inventor:
Dr. Arokia Nathan 55 Culpepper Dr.
Waterloo, ON, N2L3G1 CANADA
Citizenship: Canadian G. Reza Chaji 507-196 Westmount Road North Waterloo, ON, N2L3G5 CANADA
Canadian resident Filing: Canada or USA
I

ABSTRACT
Disclose 7s a stable AMOLED dis la to deaL-mdth.. instability- of backplane and w ic prov thermal, or other means of transduction.

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 effects of differential aging of the pixel circuits significantly.

SUMMARY OF INVENTION

The disclosed technique stabilizes the pixel luminance by adjusting the gate voltage of the drive transistor. Although the new method can be used for each individual pixel circuits, it can be applied to some reference pixel circuits to provide aging knowledge for an off-panel algorithm.

ADVANTAGES
The new technique does not require any more driving cycle or driving circuitry than the ones used in AMLCD displays, resulting in a low cost application for portable devices including mobiles and PDAs. Also, it is insensitive to the temperature change and mechanical stress.

FIG. 1: shows two pixel circuits for the new driving technique.

FIG. 2: shows charge-pump amplifier configuration to extract the pixel aging.
FIG. 3: shows trans-resistance amplifier configuration to extract the pixel aging.
I

FIG. 1 shows two pixel circuits that can provide constant luminance over the lifetime of the display. FIG. 1(a) is a pixel circuit with OLED 10 at the source of the drive transistor T1 and FIG. 1(b) is a pixel circuit with OLED 10 at the drain of the drive transistor Tl. The pixel circuits comprise two switches T2 and T3, a drive transistor T1, OLED 10, a storage capacitor CS, and a generic sensor (e.g. optical, thermal, and etc) S1. Here, Vbl can be connected to ground, Vdd, or the source of the drive TFT. All the transistors can be fabricated using amorphous silicon, nano/macro crystalline silicon, poly silicon, cmos, and organic. Also, the transistors can be replaced by PMOS.

During the programming cycle, node A is charged to a programming voltage through T2 while SEL[i] is high. The aging of the drive TFT Tl and OLED 10 can be compensated in two different ways: in-pixel compensation, and of-panel calibration.

In-pixel compensation During the programming cycle of next adjacent row, SEL[i+l]/SEL[i-1] is high.
Therefore, the voltage at node A is discharged through the sensor S1. However, the amount of discharged voltage depends on the resistance of the sensor which is controlled by the OLED luminance or temperature. Therefore, as the pixel ages the amount of discharged voltage will reduce.

Of-panel calibration The idea is to extract the aging of the pixel by reading back the sensor, and calibrate the programming voltage in order to compensate for the pixel aging including VT
shift and OLED
degradation.

FIG. 2 shows using a charge-pump configuration to read back the discharged voltage. At the beginning of the read-back cycle, Swl is ON, and so the line is charged to Vb2. Also, Cl is charged to a voltage, Vpie as a result of leakage contributed from all the pixels connected to the line. Then SEL[i] goes high and so the discharged voltage is developed across C1. The difference between the two extracted voltages can be used to calculate the pixel aging.

Since the sensor S1 is OFF most of the time in this configuration, the sensor Si ages very slightly.
Also, the sensor Si can be biased correctly to suppress its degradation significantly. More importantly, this method can be used for aging extraction of the sensor Sl itself. At this mode, the pixel is OFF, and so the difference between the extracted voltage and the voltage extracted for the OFF state of a fresh pixel results in the extraction of sensor S1 degradation.

FIG. 3 shows a trans-resistance amplifier structure to extract the pixel aging. At the beginning of the read-back cycle, Swl is ON while SEL[i] is low. Therefore, the leakage current is extracted as the output voltage of trans-resistance amplifier. Next, SEL[i] goes high and so the sensor current related to the luminance or temperature of the pixel is read back as the output voltage of trans-resistance amplifier. Using the two extracted voltages, one can calculate the pixel aging.
Since the sensor S1 is OFF most of the time in this configuration, the sensor S1 ages very slightly.
Also, the sensor S1 can be biased correctly to suppress its degradation significantly. More I

importantly, this method can be used for aging extraction of the sensor Sl itself. At this mode, the pixel is OFF, and so the difference between the extracted voltage and the voltage extracted for the OFF state of a fresh pixel results in the extraction of sensor S1 degradation.

I

Claims
CA002551237A 2006-01-09 2006-06-27 Stable driving scheme for amoled displays using feedback elements Abandoned CA2551237A1 (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
CA002551237A CA2551237A1 (en) 2006-06-27 2006-06-27 Stable driving scheme for amoled displays using feedback elements
EP07701644.2A EP1971975B1 (en) 2006-01-09 2007-01-05 Method and system for driving an active matrix display circuit
CA 2570898 CA2570898C (en) 2006-01-09 2007-01-05 Method and system for driving an active matrix display circuit
EP12156251.6A EP2458579B1 (en) 2006-01-09 2007-01-05 Method and system for driving an active matrix display circuit
KR1020087019498A KR20090006057A (en) 2006-01-09 2007-01-05 Method and system for driving an active matrix display circuit
JP2008549724A JP5164857B2 (en) 2006-01-09 2007-01-05 Driving method and display system for active matrix display circuit
PCT/CA2007/000013 WO2007079572A1 (en) 2006-01-09 2007-01-05 Method and system for driving an active matrix display circuit
CN2007800077270A CN101395653B (en) 2006-01-09 2007-01-05 Method and display system for driving pixel circuit with luminous device
US11/651,099 US8253665B2 (en) 2006-01-09 2007-01-09 Method and system for driving an active matrix display circuit
TW096100837A TWI415067B (en) 2006-01-09 2007-01-09 Method and system for driving an active matrix display circuit
US13/243,330 US8564513B2 (en) 2006-01-09 2011-09-23 Method and system for driving an active matrix display circuit
US13/413,517 US8624808B2 (en) 2006-01-09 2012-03-06 Method and system for driving an active matrix display circuit
US13/649,888 US9269322B2 (en) 2006-01-09 2012-10-11 Method and system for driving an active matrix display circuit
US14/095,583 US9058775B2 (en) 2006-01-09 2013-12-03 Method and system for driving an active matrix display circuit
US14/491,885 US10229647B2 (en) 2006-01-09 2014-09-19 Method and system for driving an active matrix display circuit
US14/993,174 US9489891B2 (en) 2006-01-09 2016-01-12 Method and system for driving an active matrix display circuit
US15/288,019 US10262587B2 (en) 2006-01-09 2016-10-07 Method and system for driving an active matrix display circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002551237A CA2551237A1 (en) 2006-06-27 2006-06-27 Stable driving scheme for amoled displays using feedback elements

Publications (1)

Publication Number Publication Date
CA2551237A1 true CA2551237A1 (en) 2007-12-27

Family

ID=38834886

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002551237A Abandoned CA2551237A1 (en) 2006-01-09 2006-06-27 Stable driving scheme for amoled displays using feedback elements

Country Status (1)

Country Link
CA (1) CA2551237A1 (en)

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