METHOD AND SYSTEM FOR PROGRAMMING, CALIBRATING AND DRIVING A LIGHT EMITTING DEVICE DISPLAY

• US 20130027381A1
• Filed: 08/07/2012
• Published: 01/31/2013
• Est. Priority Date: 12/15/2004
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Nathan, Arokia, Servati, Peyman, Chaji, Gholamreza Reza
• Granted Patent: US 8,736,524 B2
• Time in Patent Office: Days
• US Class Current: 345/212
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/0262 The 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
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/0295 by monitoring each display pixel
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3241 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
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 3/3283 in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

A method and system for programming, calibrating and driving a light emitting device display is provided. The system may include extracting a time dependent parameter of a pixel for calibration.

Claims

1-18. -18. (canceled)

19. A method of driving a display array, the display array including a plurality of pixel circuits, each pixel circuit including a driving transistor, at least one switch transistor, a storage capacitor and a light emitting device, the method comprising the steps of:

applying a current or voltage to the light emitting device;

monitoring a current or voltage flowing through the light emitting device;

predicting a shift in the voltage of the light emitting device, based on the monitored current or voltage and determining the state of the pixel circuit; and

providing, to the light emitting device, a bias associated with the shift in the voltage of the light emitting device.

20. A method according to claim 19, wherein the light emitting device is an organic light emitting diode.

21. A method according to claim 20, wherein the predicting step includes the step of:

estimating an intermediate voltage of the organic light emitting diode.

22. A system for driving a display array, the display array including a plurality of pixel circuits, each pixel circuit including a driving transistor, at least one switch transistor, a storage capacitor and a light emitting device, the system comprising:

a monitor for monitoring a current or voltage on the pixel circuit;

a data process unit for predicting a shift in the voltage of the light emitting device, based on the monitored current or voltage and determining the state of the pixel circuit; and

a circuit for providing, to the light emitting device, a bias associated with the shift in the voltage of the light emitting device.

23. A system according to claim 22, wherein the light emitting device is an organic light emitting diode.

24. A system according to claim 23, wherein the data process unit estimates an intermediate voltage of the organic light emitting diode.

25. A system according to claim 22, wherein the light emitting device is an organic light emitting diode.

26. A system according to claim 22, wherein at least one of the transistors is a thin film transistor.

27. A system according to claim 22, wherein the transistor of the pixel circuit is a n-type or p-type TFT.