Scanning orders in inversion schemes of displays

• US 8,786,586 B2
• Filed: 05/24/2011
• Issued: 07/22/2014
• Est. Priority Date: 05/24/2011
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Bae, Hopil, Ge, Zhibing
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): POLO, GUSTAVO D
• Application Number:
  US13/143,186
• Publication Number:
  US 20120299900A1
• Time in Patent Office: 1,155 Days
• Field of Search: 345/88, 345/100, 345208-214, 345/691
• US Class Current: 345/210
• CPC Class Codes: G09G 2310/02 Addressing, scanning or driving the display screen or processing steps related thereto
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general

Abstract

Updating an image of a display is provided by scanning rows of sub-pixels of the display by applying voltages to pixel electrodes of adjacent sub-pixels in different lines such that polarity changes in opposite directions can occur in two sub-pixels that are adjacent to a particular sub-pixel. In one example, a positive-polarity voltage can be applied to one sub-pixel that is adjacent to a particular sub-pixel, causing a swing in the polarity of the sub-pixel from negative to positive. A negative-polarity voltage can be applied to another sub-pixel that is adjacent to the particular sub-pixel, swinging the polarity of the pixel electrode from positive to negative. A change in brightness of the particular sub-pixel that may result from a voltage swing one direction in an adjacent sub-pixel may be offset by a change in brightness of the particular sub-pixel that may result from a voltage swing in another adjacent sub-pixel.

Claims

1. A method of updating an image displayed by a display screen in a first image frame, the display screen including a plurality of sub-pixels, the method comprising:

updating one or more target sub-pixels by applying a target voltage to the one or more target sub-pixels;

updating, after the update of the one or more target sub-pixels, one or more first sub-pixels by applying a first voltage to the one or more first sub-pixels, the one or more first sub-pixels being adjacent to the one or more target sub-pixels, wherein the application of the first voltage changes a voltage polarity of the one or more first sub-pixels in one of a positive direction and a negative direction and the application of the first voltage causes a first brightness change to the one or more target sub-pixels; and

updating, after the update of the one or more first sub-pixels, one or more second sub-pixels by applying a second voltage to the one or more second sub-pixels, the one or more second sub-pixels being adjacent to the one or more target sub-pixels, wherein the application of the second voltage changes a voltage polarity of the one or more second sub-pixels in an opposite direction as the change in voltage polarity of the one or more first sub-pixels and the application of the second voltage causes a second brightness change to the one or more target sub-pixels, the second brightness change offsetting the first brightness change.

2. The method of claim 1, wherein the application of the target voltage changes a voltage polarity of the one or more target sub-pixels.

3. The method of claim 1, wherein the plurality of sub-pixels are updated according to an inversion scheme, and the one or more target sub-pixels, one or more first sub-pixels, and one or more second sub-pixels are included in a block of sub-pixels of the inversion scheme.

4. The method of claim 3, wherein the inversion scheme is one of a 2-line inversion scheme and a 2-dot inversion scheme.

5. The method of claim 4, wherein the block further includes one or more third sub-pixels adjacent to the one or more second sub-pixels, the sub-pixels being arranged in rows such that the one or more first sub-pixels are a first row of the block, the one or more target sub-pixels are a second row of the block, the one or more second sub-pixels are a third row of the block, and the one or more third sub-pixels are a fourth row of the block, and wherein a scanning order of the block is second row, first row, fourth row, and third row.

6. The method of claim 3, wherein the block further includes one or more third sub-pixels adjacent to the one or more second sub-pixels, the method further comprising:

updating, before the update of the one or more second subpixels, the one or more third sub-pixels by applying a third voltage to the one or more third sub-pixels.

7. The method of claim 6, wherein the application of the third voltage changes the voltage polarity of the one or more third sub-pixels.

8. An apparatus comprising:

a display screen including a plurality of sub-pixels including one or more target sub-pixels, one or more first sub-pixels, and one or more second sub-pixels, the one or more target sub-pixels being in between and adjacent to each of the one or more first sub-pixels and the one or more second sub-pixels; and

a scanning system that scans the plurality of sub-pixels to update the sub-pixels, including

updating the one or more target sub-pixels by applying a target voltage to the one or more target sub-pixels,

updating, after the update of the one or more target sub-pixels, one or more first sub-pixels by applying a first voltage to the one or more first sub-pixels, wherein the application of the first voltage changes a voltage polarity of the one or more first sub-pixels in one of a positive direction and a negative direction and the application of the first voltage causes a first brightness change to the one or more target sub-pixels, and

updating, after the update of the one or more first sub-pixels, one or more second sub-pixels by applying a second voltage to the one or more second sub-pixels, wherein the application of the second voltage changes a voltage polarity of the one or more second sub-pixels in an opposite direction as the change in voltage polarity of the one or more first sub-pixels and the application of the second voltage causes a second brightness change to the one or more target sub-pixels, the second brightness change offsetting the first brightness change.

9. The apparatus of claim 8, wherein the application of the target voltage changes a voltage polarity of the one or more target sub-pixels.

10. The apparatus of claim 8, wherein scanning system scans the plurality of sub-pixels according to an inversion scheme, and the one or more target sub-pixels, one or more first sub-pixels, and one or more second sub-pixels are included in a block of adjacent sub-pixels of the inversion scheme.

11. The apparatus of claim 10, wherein the inversion scheme is one of a 2-line inversion scheme and a 2-dot inversion scheme.

12. The apparatus of claim 11, wherein the block further includes

one or more third sub-pixels adjacent to the one or more second sub-pixels,

the one or more third sub-pixels arranged in rows such that the one or more first sub-pixels are a first row of the block, the one or more target sub-pixels are a second row of the block, the one or more second sub-pixels are a third row of the block, and the one or more third sub-pixels are a fourth row of the block, and wherein the scanning system scans the block in a scanning order of the block, the scanning order being second row, first row, fourth row, and third row.

13. The apparatus of claim 10, wherein the block further includes

one or more third sub-pixels adjacent to the one or more second sub-pixels, and the scanning of the plurality of lines of sub-pixels by the scanning system further includes updating, before the update of the one or more second sub-pixels, the one or more third sub-pixels by applying a third voltage to one or more third sub-pixels.

14. The apparatus of claim 13, wherein the application of the third voltage changes a voltage polarity of the one or more third sub-pixels.

15. A non-transitory computer-readable storage medium storing computer-readable instructions that, when executed by a computing device, cause the device to perform a method of updating an image displayed by a display screen in a first image frame, the display screen including a plurality of sub-pixels, the method comprising:

updating one or more target sub-pixels by applying a target voltage to the one or more target sub-pixels;

updating, after the update of the one or more target sub-pixels, one or more first sub-pixels by applying a first voltage to the one or more first sub-pixels, the one or more first sub-pixels being adjacent to the one or more target sub-pixels, wherein the application of the first voltage changes of a voltage polarity of the one or more first sub-pixels in one of a positive direction and a negative direction and the application of the first voltage causes a first brightness change to the one or more target sub-pixels; and

updating, after the update of the one or more first sub-pixels, one or more second sub-pixels by applying a second voltage to one or more second sub-pixels, the one or more second sub-pixels being adjacent to the one or more target sub-pixels, wherein the application of the second voltage changes a voltage polarity of the one or more second sub-pixels in an opposite direction as the change in voltage polarity of the one or more first sub-pixels and the application of the second voltage causes a second brightness change to the one or more target sub-pixels, the second brightness change equal to or less than the first brightness change.

16. The non-transitory computer-readable storage medium of claim 15, wherein the application of the target voltage changes the voltage polarity of the one or more target sub-pixels.

17. The non-transitory computer-readable storage medium of claim 15, wherein the plurality of sub-pixels are updated according to an inversion scheme, and the one or more target subpixels, the one or more first sub-pixels, and the one or more second sub-pixels are included in a block of adjacent sub-pixels of the inversion scheme.

18. The non-transitory computer-readable storage medium of claim 17, wherein the inversion scheme is one of a 2-line inversion scheme and a 2-dot inversion scheme.

19. The non-transitory computer-readable storage medium of claim 18, wherein the block further includes one or more third sub-pixels adjacent to the one or more second sub-pixels,

the one or more third sub-pixels arranged in rows such that the one or more first sub-pixels are a first row of the block, the one or more target sub-pixels are a second row of the block, the one or more second sub-pixels are a third row of the block, and the one or more third sub-pixels are the fourth row of the block, and wherein a scanning order of the block is second row, first row, fourth row, and third row.

20. The non-transitory computer-readable storage medium of claim 17, wherein the block further includes one or more third sub-pixels adjacent one or more second sub-pixels, the method further comprising:

updating, before the update of the one or more second sub-pixels, the one or more third sub-pixels by applying a third voltage to the one or more third sub-pixels.

21. The non-transitory computer-readable storage medium of claim 20, wherein the application of the third voltage changes a voltage polarity of the one or more third sub-pixels.