CA2528641A1 - A method and system for calibrating a light emitting device display - Google Patents

A method and system for calibrating a light emitting device display Download PDF

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Publication number
CA2528641A1
CA2528641A1 CA002528641A CA2528641A CA2528641A1 CA 2528641 A1 CA2528641 A1 CA 2528641A1 CA 002528641 A CA002528641 A CA 002528641A CA 2528641 A CA2528641 A CA 2528641A CA 2528641 A1 CA2528641 A1 CA 2528641A1
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CA
Canada
Prior art keywords
row
display array
error
pixel circuits
current
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.)
Granted
Application number
CA002528641A
Other languages
French (fr)
Other versions
CA2528641C (en
Inventor
Sanjiv Sambandan
Peyman Servati
Arokia Nathan
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
Priority claimed from CA002490861A external-priority patent/CA2490861A1/en
Application filed by Ignis Innovation Inc filed Critical Ignis Innovation Inc
Priority to CA2528641A priority Critical patent/CA2528641C/en
Publication of CA2528641A1 publication Critical patent/CA2528641A1/en
Application granted granted Critical
Publication of CA2528641C publication Critical patent/CA2528641C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G09G3/3258—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 voltage across 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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G3/2096—Details of the interface to the display terminal specific for a flat panel
    • 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

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)
  • Control Of El Displays (AREA)

Abstract

A method and system for calibrating a light emitting device display is provided. The display includes a plurality of pixel circuits, each having a light emitting device. The system for the calibration monitors current drawn from a row of the display array, and generates a correction parameter to correct brightness level of the light emitting device.

Claims (26)

1. A system for calibration of a display array having a plurality of pixel circuits, comprising:
an error extraction system for extracting error including:
a first module for monitoring a row current in a row of the display array;
a second module for generating a reference current; and a third module for obtaining an error between the row current and the reference current, and an error estimation system for estimating a correction parameter based on the error to adjust a data voltage applied to the display array.
2. A system according to claim 1, further comprising a dummy row corresponding to a row of the display array and having a plurality of the pixel circuits, for providing the reference current.
3. A system according to claim 2, wherein the pixel circuits in the dummy row receive data voltages from a data driver, which are identical to those of the pixel circuits in the row of the display array, and wherein the second module monitors a current drawn from the pixel circuits in the dummy row to provide the reference current.
4. A system according to claim 3, further comprising a system for controlling and scheduling a normal display operation and a calibration to the display array, and wherein the controlling and scheduling system selects a row of the display array so as to separately implement the calibration to the rows of the display array.
5. A system according to claim 4, further comprising a first switch system for connecting the rows of the display array to a main voltage supply, a second switch system for selectively connecting a row of the display array to the error estimation system, and a third switch system for connecting the dummy row to the data driver, and wherein the controlling and scheduling system manages the operations of the first, second and third switch systems.
6. A system according to claim 5, wherein during the calibration, the rows of the display array are sequentially connected to the error extraction system through the second switch system, and the dummy row is connected to the data driver through the third switch system.
7. A system according to claim 6, wherein during the calibration, the first module monitors the row current in the selected row of the display array, and the third module compares each monitored row current to the reference current.
8. A system according to claim 5, wherein during the normal display operation, the rows of the display array are connected to the main voltage supply through the first switch system, and the dummy row is disconnected from the data driver.
9. A system according to claim 1, wherein the error estimation system includes a look up table for storing a plurality of correction parameters, and the error estimation system retrieves a corresponding correction parameter for the row of the display array from the look up table based on the error.
10. A system according to claim 9, wherein the error estimation system retrieves the corresponding correction parameter for the row of the display array from the look up table based on the error and a total data voltage applied to the pixel circuits in the row of the display array.
11. A system according to claim 10, wherein the average of the correction parameters for all rows of the display array is applied to data voltages for all of the pixel circuits in the display array.
12. A system according to claim 10, wherein the look up table includes a mapping parameter specific to the total data voltage and the transfer function of the third module.
13. A system according to claim 1, wherein the error estimation system includes a calculation module for calculating a corresponding correction parameter for the row of the display array based on the error.
14. A system according to claim 13, wherein the calculation module calculates the corresponding correction parameter for the row of the display array based on the error and a total data voltage applied to the pixel circuits in the row of the display array.
15. A system according to claim 14, wherein the average of the correction parameters for all rows of the display array is applied to data voltages for all of the pixel circuits in the display array.
16. A system according to claim 1, wherein at least one of the first and second modules includes a current mirror.
17. A system according to claim 1, wherein the pixel circuit includes a light emitting device and a driver transistor connected to the light emitting device, the light emitting device or the driver transistor being connected to a voltage supply in a corresponding row of the display array, and the first module monitoring the row current drawn from the voltage supply.
18. A system according to claim 1, wherein the pixel circuit is a voltage programmed pixel circuit.
19. A system according to claim 1, wherein the display array is an AMOLED
display array.
20. A system according to claim 1, wherein the display array has a-Si, polysilicon, or crystalline based backplane.
21. A system according to claim 1, wherein the pixel circuit has n-type transistors.
22. A system according to claim 1, wherein the pixel circuit has p-type transistors.
23. A method of calibration of a display array having a plurality of pixel circuits, comprising the steps of:
extracting error, including:
providing a reference current;
monitoring a row current in a row of the display array; and for the row, obtaining an error between the row current and the reference current, estimating a correction parameter for the row based on the error and a total data voltages applied to the pixel circuits in the row of the display array.
24. A method according to claim 23, further comprising the steps of:
selecting a next row of the display array and repeating the steps of extracting error and estimating the correction parameter, and calculating an average of the correction parameters for the rows of the display array to apply the average of the correction parameters to data voltages applied to the display array.
25. A method according to claim 24, further comprising the step of applying the average of the correction parameters to data voltages for the pixel circuits in the display array.
26. A method according to claim 23, wherein the step of providing a reference current includes the step of:
connecting a dummy row corresponding to a row of the display array to a data driver generating the data voltages; and monitoring a current drawn from the dummy row to provide the reference current.
CA2528641A 2004-12-01 2005-12-01 A method and system for calibrating a light emitting device display Expired - Fee Related CA2528641C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2528641A CA2528641C (en) 2004-12-01 2005-12-01 A method and system for calibrating a light emitting device display

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA002490861A CA2490861A1 (en) 2004-12-01 2004-12-01 Fuzzy control for stable amoled displays
CA2,490,861 2004-12-01
CA2528641A CA2528641C (en) 2004-12-01 2005-12-01 A method and system for calibrating a light emitting device display

Publications (2)

Publication Number Publication Date
CA2528641A1 true CA2528641A1 (en) 2006-06-01
CA2528641C CA2528641C (en) 2011-03-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2528641A Expired - Fee Related CA2528641C (en) 2004-12-01 2005-12-01 A method and system for calibrating a light emitting device display

Country Status (1)

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CA (1) CA2528641C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3168879A1 (en) * 2015-11-11 2017-05-17 LG Display Co., Ltd. Organic light emitting diode display and method for driving the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3168879A1 (en) * 2015-11-11 2017-05-17 LG Display Co., Ltd. Organic light emitting diode display and method for driving the same
CN106683615A (en) * 2015-11-11 2017-05-17 乐金显示有限公司 Organic light emitting diode display and method for driving the same
US9715853B2 (en) 2015-11-11 2017-07-25 Lg Display Co., Ltd. Organic light emitting diode display and method for driving the same
CN106683615B (en) * 2015-11-11 2019-09-06 乐金显示有限公司 Organic light emitting diode display and its driving method

Also Published As

Publication number Publication date
CA2528641C (en) 2011-03-15

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