CA2503237A1 - Step calibration driving method and circuit for amoled displays - Google Patents

Step calibration driving method and circuit for amoled displays Download PDF

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Publication number
CA2503237A1
CA2503237A1 CA 2503237 CA2503237A CA2503237A1 CA 2503237 A1 CA2503237 A1 CA 2503237A1 CA 2503237 CA2503237 CA 2503237 CA 2503237 A CA2503237 A CA 2503237A CA 2503237 A1 CA2503237 A1 CA 2503237A1
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CA
Canada
Prior art keywords
pixel
driving method
voltage
circuit
oled
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 2503237
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 2503237 priority Critical patent/CA2503237A1/en
Priority to CN2005800480205A priority patent/CN101116129B/en
Priority to US11/304,162 priority patent/US7619597B2/en
Priority to CA002590366A priority patent/CA2590366C/en
Priority to EP13187593.2A priority patent/EP2688058A3/en
Priority to JP2007545796A priority patent/JP5128287B2/en
Priority to KR1020077016146A priority patent/KR20070101275A/en
Priority to EP11168677.0A priority patent/EP2383720B1/en
Priority to PCT/CA2005/001897 priority patent/WO2006063448A1/en
Priority to EP05819617.1A priority patent/EP1836697B1/en
Priority to TW094144535A priority patent/TWI402790B/en
Priority to CA002526782A priority patent/CA2526782C/en
Publication of CA2503237A1 publication Critical patent/CA2503237A1/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 US14/253,422 priority patent/US9275579B2/en
Priority to US14/261,755 priority patent/US9280933B2/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

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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
    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
    • 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]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems

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  • 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 for providing a stable current source for active matrix light emitting displays, in particular, active matrix organic light emitting diode (AMOLED) displays. The techniques include a driving method to generate a gate-source voltage independent of the first order and second order effects of the shift in the threshold voltage of the drive thin film transistor (TFT), OLED voltage, and OLED efficiency.

Description

FIELD OF THE INVENTION
The present invention generally relates to a light emitting device displays, and particularly, to a driving technique for AMOLED, and to enhance the brightness stability of the OLED by using circuit compensation.
SUMMARY OF INVENTION
Disclosed technique extracts the time dependent parameters of the pixel such as VT-shift, clock feed-through, and charge injection effects. The programming-voltage is calibrated with the extracted information, resulting in a stable pixel current over time.
Advantages The pixel circuit provides a stable current independent of the VT-shift in the drive and switch TFTs and OLED degradation under prolonged display operation, to efficiently improve the display operating lifetime.

FIG. 1 is a circuit diagram of an embodiment of a pixel circuit and its corresponding waveforms.
FIG. 2 shows the driver and extraction blocks for the pixel of FIG. 1.
FIG. 3 shows the extraction algorithm.
FIG.4 shows integration of the new pixel for high resolution and large area displays.

FIG.1 (a-b) shows a pixel circuit along with its control signals. This method is valid with complementary device (p-type transistor) as well.
The pixel circuit comprises three transistors T1, T2 and T3, a storage capacitor 10 and an organic light-emitting diode (OLED) 11. The pixel circuit is connected to two select lines (SELL and SEL2), a signal line (VDATA), a monitor line (Monitor), a voltage line (VDD), and a common ground.
Transistors Tl, T2 and T3 can be amorphous silicon, poly silicon, or organic thin-film transistors (TFT) or standard NMOS in CMOS technology.
The source and drain terminals of the driving transistor Tl are connected to the ground and cathode electron of the OLED 11, respectively. The gate terminal of T1 is connected to the input signal line (VDATA) through T2 and the drain terminal of Tl is connected to the output signal line through T3.
The source terminal of T2 is connected to the gate of Tl and its drain terminal is connected to the input signal line (VDATA). The drain terminal of T3 is connected to the source terminal of Tl and its source terminal is connected to the output signal line (Monitor).
Transistor T3 is a switch. The gate terminal of T3 is connected to SEL2. The source terminal of T3 is connected to monitor line (Monitor), and the drain terminal is connected to the cathode terminal of the OLED 11. The cathode electrode of the OLED 11 is connected to the common VDD.
The operation of presented pixel in FIGI (a) consists of two operating cycles:
programming cycles and driving cycle. At the end of the programming cycles node A is charged to (VP+VT) where VP is a programming voltage and VT is the threshold voltage of T1.
With reference to the waveform shown on FIG.1 (b) we describe the following operating cycles.
Here, VB is the bias voltage during the extraction cycle, V~ the intermediate value of the threshold voltage, and Vs is the resolution of the driver, 20, depicted in FIG
2 where 1~, 21, is the switch resistance. The responsibilities of DPU, 22, block are controlling of the programming cycle, contrast, and brightens and performing the calibration procedure. The current sense amplifier (SA), 23, block is used to extract the VT, during the extraction cycle. This block can be shared between few columns result in less overhead. Also, the calibration of the pixel circuit can be done one at a time, so the extraction circuits can be shared between the all columns.

In the first operating cvcle, node A is discharged to zero, and node B is charged to VDD.
In the second o~eratin;~cycle, node A is charged to (VB +V~). The value of V~
is defined based on the algorithm shown in FIG. 3. Here, VT(i~j) is the extracted threshold voltage for the pixel(i~j) at the previous extraction cycle, and s(i~j) the previous state of the pixel. When s(i~j)=Less state, the actual VT is less than V~,~(i,j), V~ is set to (V~,{i~j)-Vs). When s(i,j)=Equal state, the actual VT is equal to VT(i~j), VTM is set to VT(i~j).
When s(i~j)=Greater state, the actual VT is greater than VT(i~j), V~ is set to (VT(i~j)+Vs).
In the third operating cycle, SEL1 goes to zero. Here, the gate-source voltage of Tl is given by YES=VB+YTM+AVB+AYTM-~Y~-AYH
where, ~VB, ~V~,~, , OVA, and OVH are the secondary effects depending on VB, V~,, V~, and VH, respectively. The SA block is tuned to sense the current larger than (3(VB)2, so that the gate-source voltage of T1 should be larger than (VB+VT,). As a result, after few iterations, V~,~, and VT(i,j) converge to VTM =YTl-Y~(YB+YT,'~YTZ-vH)~
Y - Caa l(2 . Cs) .
1+Cg2/(2~CS) In the fourth operatincycle, node A is charged to [VP~VT(i~j)-y(VP-VB)].
In the fifth operatine cycle, SEL 1 goes to zero. Considering the secondary effects, we can write the gate-source voltage of T1 as Y~S=vp+vT,.
Therefore, the pixel current becomes independent of the first and second order effects of the VT-shift.
To reduce the number of signal lines, we can use the same signal as SEL2 for SEL1. In this case, SELL stays at high in the third operating cycle, and the Vos remains at (VB+V~; therefore, the secondary effects cannot be detected.
The operation of the pixel circuit shown in FIG.1 (c) is the same as the above one except that the OLED is at the source of the TFT.
FIG. 4 shows the results for both cases: case I, SEL I goes to zero in third operating cycle; case II, SEL1 stays at high in the third operating cycle. It is seen, that the pixel current of the second case is smaller than that of the first case for a given programming voltage due to the secondary effects of the VT-shift. Also, the pixel current of the second case increases as the VT of Tl increases (a), and decreases as the VT of T2 decreases (b). However, the pixel current of the first case is stable. The maximum error induced in the pixel current is less than %0.5 for any shift in the VT of the drive and switch TFTs. Here, OVT~R and OV~,R are the minimum detectable shift in the VT of T1 and T2, respectively. It is obvious that OVTZR iS larger than OVTiR because the effect of a shift in VTR on the pixel current is dominant. These two parameters are controlled by the resolution of the driver (Vs), and the SNR of the SA block. Since a shift smaller than ~VT1R
cannot be detected, and also the time constant of VT-shift is large, the extraction cycles (first, second, and third operating cycles) can be done after a long time interval consisting of several frames, leading to lower power consumption. Also, the major operating cycles become programming (fourth) and driving (fifth) cycles. As a result, the programming time reduces significantly, providing for high-resolution, large-area AMOLED displays where a high-speed programming is prerequisite.
FIG. 5 shows the integration of the new pixel circuit along with the required blocks and timing diagram. Here, an extra memory is required to store the extracted values for the threshold voltages of the drive TFTs. Aiso, the DUP block should be modified to perform the calibration.
As FIG. 5 shows, only one extraction procedure occurs during a frame time.
Also, the VT
extraction of the pixel circuits at the same row is preformed at the same time. Therefore, the maximum time required to refresh a frame is zF =nwp+zE.
Here, iF is the frame time, iP the time required to write the pixel data into the storage capacitor, iE
the extraction time, and n the number of row in the display. Assuming iE
=m.iP, we can rewrite the frame time as zF = (n + m)zP , For example, for a QVGA display (240x320) with frame rate of 60Hz, if m=10, the programming time of each row is 66p,s, and the extraction time is 0.66ms.

Claims
CA 2503237 2004-12-15 2005-04-08 Step calibration driving method and circuit for amoled displays Abandoned CA2503237A1 (en)

Priority Applications (26)

Application Number Priority Date Filing Date Title
CA 2503237 CA2503237A1 (en) 2005-04-08 2005-04-08 Step calibration driving method and circuit for amoled displays
CA002526782A CA2526782C (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
CA002590366A CA2590366C (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
CN2005800480205A CN101116129B (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
KR1020077016146A KR20070101275A (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
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
TW094144535A TWI402790B (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
US14/253,422 US9275579B2 (en) 2004-12-15 2014-04-15 System and methods for extraction of threshold and mobility parameters in AMOLED displays
US14/261,755 US9280933B2 (en) 2004-12-15 2014-04-25 System and methods for extraction of threshold and mobility parameters in AMOLED displays
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

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105761673A (en) * 2014-12-31 2016-07-13 乐金显示有限公司 Organic light emitting diode display device and driving method thereof
EP3168835A1 (en) * 2015-11-10 2017-05-17 LG Display Co., Ltd. Organic light emitting diode display and gamma compensation method for driving the same
CN110288949A (en) * 2019-08-08 2019-09-27 京东方科技集团股份有限公司 A kind of pixel circuit and its driving method, display device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105761673A (en) * 2014-12-31 2016-07-13 乐金显示有限公司 Organic light emitting diode display device and driving method thereof
EP3168835A1 (en) * 2015-11-10 2017-05-17 LG Display Co., Ltd. Organic light emitting diode display and gamma compensation method for driving the same
US9990888B2 (en) 2015-11-10 2018-06-05 Lg Display Co., Ltd. Organic light emitting diode display and method for driving the same
CN110288949A (en) * 2019-08-08 2019-09-27 京东方科技集团股份有限公司 A kind of pixel circuit and its driving method, display device
US11335264B2 (en) 2019-08-08 2022-05-17 Hefei Boe Joint Technology Co., Ltd. Pixel circuit and driving method thereof, and display apparatus

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