Compensation accuracy

• US 9,990,882 B2
• Filed: 07/26/2016
• Issued: 06/05/2018
• Est. Priority Date: 08/12/2013
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Chaji, Gholamreza, Zahirovic, Nino
• Primary Examiner(s): Dharia, Prabodh M
• Application Number:
  US15/219,377
• Publication Number:
  US 20160335952A1
• Time in Patent Office: 679 Days
• Field of Search: 345 76, 345 89, 345204-215, 345690, 345699, 345694, 348 56
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• 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 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• 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
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]

Abstract

A system uses image data, representing images to be displayed in successive frames, to drive a display having pixels that include a drive transistor and an organic light emitting device by dividing each frame into at least first and second sub-frames, supplying the image data during one of the sub-frames, supplying compensation data during the other of the sub-frames, compensating image data based on the compensation data, and supplying each pixel with a drive current that is based on the compensated image data during each frame. The compensated image data may be supplied from a driver having a preselected data resolution, and the system determines whether the compensated image data is greater than the data resolution of the driver, and if the compensated image data is greater than the data resolution of the driver, transfers the excess compensated image data to a different sub-frame.

Claims

1. A method of driving a display, the display for displaying image data in successive frames and having pixels that include a drive transistor and an organic light emitting device, said method comprising:

dividing each frame into a plurality of sub-frames,

supplying a pixel with a drive current that is based on data comprising said image data during one of said sub-frames, and

supplying the pixel with a drive current that is based on data comprising compensation data during at least two of said sub-frames, the compensation data divided among said at least two of said sub-frames,

thereby compensating for at least one of performance and a property of said pixel.

2. The method of claim 1 in which said data comprising said compensation data is supplied from a driver having a preselected data resolution, and which includes

determining whether the data comprising said compensation data is greater than the data resolution of said driver, and

if the data comprising said compensation data is greater than the data resolution of said driver, transferring the excess data comprising said compensation data to a different sub-frame.

3. The method of claim 1 in which the sub-frame during which the pixel is supplied with a drive current that is based on data comprising said image data is longer in duration than at least one other sub-frame during which the pixel is supplied with a drive current that is based on data comprising said compensation data.

4. A method of driving a display, the display for displaying image data in successive frames and having pixels that include a drive transistor and an organic light emitting device, said method comprising:

dividing each frame into a plurality of sub-frames,

dividing compensation data among said sub-frames, and

supplying a pixel with a drive current that is based on data comprising a division of said compensation data during each sub-frame into which said compensation data is divided,

thereby compensating for at least one of performance and a property of said pixel.

5. The method of claim 4 in which said compensation data is divided substantially equally among said sub-frames, and any residue value is supplied to one of the sub-frames.

6. The method of claim 4 in which said sub-frames have different sub-frame durations.

7. A method of driving a display, the display for displaying image data in successive frames and having pixels that include a drive transistor and an organic light emitting device, said method comprising:

dividing compensation data among a plurality of frames, and

supplying a pixel with a drive current that is based on data comprising a division of said compensation data during each frame into which said compensation data is divided,

thereby compensating for at least one of performance and a property of said pixel.

8. The method of claim 7, further comprising remapping the image data to a new bit range defined by the total number of bits available in all frames and the number of bits of said compensation data.

9. An apparatus for driving a display, the display for displaying image data in successive frames and having an array of pixels that each include a drive transistor and an organic light emitting device, multiple select lines coupled to said array for delivering signals that select when each pixel is to be driven, and multiple data lines for delivering drive signals to the selected pixels, said apparatus comprising:

a source driver coupled to said data lines and including a processing circuit for receiving said image data and adapted to

divide each frame into a plurality of sub-frames,

supply a pixel with a drive current that is based on data comprising said image data during one of said sub-frames, and

supply the pixel with a drive current that is based on data comprising compensation data during at least two of said sub-frames, the compensation data divided among said at least two of said sub-frames,

to thereby compensate for at least one of performance and a property of each of said pixels.

10. The apparatus of claim 9 which said data comprising said compensation data is supplied from a driver having a preselected data resolution for supplying said data comprising said compensation data, and in which said processing circuit is adapted to

determine whether the data comprising said compensation data is greater than the data resolution of said driver, and

if the data comprising said compensation data is greater than the data resolution of said driver, transfer the excess data comprising said compensation data to a different sub-frame.

11. An apparatus for driving a display, the display for displaying image data in successive frames and having an array of pixels that each include a drive transistor and an organic light emitting device, multiple select lines coupled to said array for delivering signals that select when each pixel is to be driven, and multiple data lines for delivering drive signals to the selected pixels, said apparatus comprising:

a source driver coupled to said data lines and including a processing circuit for receiving said image data and adapted to

divide each frame into a plurality of sub-frames,

divide compensation data among said sub-frames, and

supply a pixel with a drive current that is based on data comprising a division of said compensation data during each sub-frame into which said compensation data is divided,

to thereby compensate for at least one of performance and a property of each of said pixels.

12. The apparatus of claim 11 in which said processing circuit is adapted to divide said compensation data substantially equally among said sub-frames, and any residue value is supplied to one of the sub-frames.

13. The apparatus of claim 11 in which said sub-frames have different sub-frame durations.

14. An apparatus for driving a display, the display for displaying image data in successive frames and having an array of pixels that each include a drive transistor and an organic light emitting device, multiple select lines coupled to said array for delivering signals that select when each pixel is to be driven, and multiple data lines for delivering drive signals to the selected pixels, said apparatus comprising:

a source driver coupled to said data lines and including a processing circuit for receiving said image data and adapted to

divide compensation data among a plurality of frames,

compensate image data based on divisions of said compensation data in each frame to compensate for at least one of performance and a property of each of said pixels, and

supply each pixel with a drive current that is based on the compensated image data during each frame.

15. The apparatus of claim 14, wherein the processing circuit is further adapted to remap the image data to a new bit range defined by the total number of bits available in all frames and the number of bits of said compensation data.

16. The apparatus of claim 14 in which a frame of said plurality of frames supplied with image data is longer than a frame of said plurality of frames supplied with compensation data.