WRITING DATA TO SUB-PIXELS USING DIFFERENT WRITE SEQUENCES

• US 20120299983A1
• Filed: 05/24/2011
• Published: 11/29/2012
• Est. Priority Date: 05/24/2011
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Chang, Shih Chang, Yu, Cheng Ho, Ge, Zhibing, Bae, Hopil
• Granted Patent: US 8,648,845 B2
• Time in Patent Office: Days
• US Class Current: 345/691
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2310/0218 with collection of electrodes in groups for n-dimensional addressing
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• 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 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

With respect to liquid crystal display inversion schemes, a large change in voltage on a data line can affect the voltages on adjacent data lines due to capacitive coupling between data lines. The resulting change in voltage on these adjacent data lines can give rise to visual artifacts in the data lines'"'"' corresponding sub-pixels. Various embodiments of the present disclosure serve to prevent or reduce persisting visual artifacts by offsetting their effects or by distributing their presence among different colored sub-pixels. In some embodiments, this may be accomplished by using different write sequences during the update of a row of pixels.

Claims

1. A method of scanning a display, the display including a plurality of display pixels that are each associated with a set of a plurality of data lines, comprising:

electrically connecting each display pixel in a line of the display pixels to the associated set of data lines during an update of the line of display pixels, the line of display pixels including a first display pixel associated with a first set of data lines and a second display pixel associated with a second set of data lines;

sequentially applying voltages to the first set of data lines in a first write sequence of the data lines during the update of the line of display pixels; and

sequentially applying voltages to the second set of data lines in a second sequence of the data lines, different than the first write sequence, during the update of the line of display pixels.

2. The method of claim 1, wherein each set of data lines includes a left data line, a center data line, and a right data line.

3. The method of claim 2, wherein sequentially applying voltages to the first set includes applying a first voltage to the center data line in the first set, and sequentially applying voltages to the second set includes applying a second voltage to the center data line in the second set, the second voltage being applied concurrently with the application of the first voltage.

4. The method of claim 3, wherein the left data line is a red data line, the center data line is a green data line, the right data line is a blue data line, the first write sequence is a green-blue-red write sequence, and the second write sequence is a green-red-blue write sequence.

5. The method of claim 1, wherein the first and second display pixels are adjacent, sequentially applying voltages to the first set includes applying a first voltage to a first data line in the first set, and sequentially applying voltages to the second set includes applying a second voltage to a second data line in the second set, the second voltage being applied concurrently with the application of the first voltage, and the first and second data lines being adjacent data lines.

6. The method of claim 1, wherein the first write sequence and second write sequence form a pattern that is repeated in adjacent pairs of display pixels.

7. The method of claim 1, wherein the first set includes a first data line, a second data line, and a third data line, the first data line being adjacent to each of the second and third data lines, and wherein sequentially applying voltages to the first set includes applying a first voltage to the first data line, applying a second voltage to the second data line such that a voltage value of the second data line changes from a positive polarity to a negative polarity, and applying a third voltage to the third data line such that a voltage value of the third data line changes from a negative polarity to a positive polarity, the application of the first voltage being prior to the application of each of the second and third voltages.

8. The method of claim 1, wherein the first set includes a first data line and a second data line, the first data line being adjacent to the second data line, the second set includes a third data line, the third data line being adjacent to the first data line, and wherein sequentially applying voltages to the first set includes applying a first voltage to the first data line, applying a second voltage to the second data line such that the polarity of a voltage value of the second data line changes, and sequentially applying voltages to the second set includes applying a third voltage to the third data line such that the polarity of a voltage value of the third data line changes, the application of the first voltage being prior to the application of each of the second and third voltages, the second voltage having a polarity that is opposite the polarity of the third voltage.

9. The method of claim 1, wherein the first and second display pixels are adjacent, the first set includes a first data line and a second data line, the first and second data lines being adjacent to each other, and the second set includes a third data line and a fourth data line, the third and fourth data lines being adjacent to each other, and wherein

sequentially applying voltages to the first set includes applying a first voltage to the first data line, and applying a second voltage to the second data line after the application of the first voltage, the application of the second voltage changing the polarity of a voltage value of the second data line, the polarity of the second voltage being the same as the polarity of the first voltage, and

sequentially applying voltages to the second set includes applying a third voltage to the third data line, and applying a fourth voltage to the fourth data line after the application of the third voltage, the application of the fourth voltage changing the polarity of a voltage value of the fourth data line, the polarity of the fourth voltage being opposite of the polarity of the third voltage.

10. The method of claim 1, wherein the line of display pixels further includes a third display pixel associated with a third set of data lines and a fourth display pixel associated with a fourth set of data lines, the method further comprising:

sequentially applying voltages to the third set of data lines in a third write sequence of the data lines during the update of the line of display pixels; and

sequentially applying voltages to the fourth set of data lines in a fourth write sequence of the data lines, during the update of the line of display pixels,

wherein the each of the first, second, third, and fourth write sequences are different from each other.

11. The method of claim 10, wherein each set of data lines includes a left data line, a center data line, and a right data line.

12. The method of claim 11, wherein the first write sequence is a red-green-blue write sequence, the second write sequence is a blue-green-red write sequence, the third write sequence is a blue-red-green write sequence, and the fourth write sequence is a red-blue-green write sequence.

13. 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 scanning a display, the display including a plurality of display pixels that are each associated with a set of a plurality of data lines, the method comprising:

electrically connecting each display pixel in a line of the display pixels to the associated set of data lines during an update of the line of display pixels, the line of display pixels including a first display pixel associated with a first set of data lines and a second display pixel associated with a second set of data lines;

sequentially applying voltages to the first set of data lines in a first write sequence of the data lines during the update of the line of display pixels; and

sequentially applying voltages to the second set of data lines in a second sequence of the data lines, different than the first write sequence, during the update of the line of display pixels.

14. The non-transitory computer-readable storage medium of claim 13, wherein each set of data lines includes a left data line, a center data line, and a right data line, and wherein sequentially applying voltages to the first set includes applying a first voltage to the center data line in the first set, and sequentially applying voltages to the second set includes applying a second voltage to the center data line in the second set, the second voltage being applied concurrently with the application of the first voltage.

15. The non-transitory computer-readable storage medium of claim 13, wherein the first and second display pixels are adjacent, and sequentially applying voltages to the first set includes applying a first voltage to a first data line in the first set, and sequentially applying voltages to the second set includes applying a second voltage to a second data line in the second set, the second voltage being applied concurrently with the application of the first voltage, and the first and second data lines being adjacent data lines.

16. The non-transitory computer-readable storage medium of claim 13, wherein the first write sequence and second write sequence form a pattern that is repeated in adjacent pairs of display pixels.

17. The non-transitory computer-readable storage medium of claim 13, wherein the first set includes a first data line, a second data line, and a third data line, the first data line being adjacent to each of the second and third data lines, and wherein sequentially applying voltages to the first set includes applying a first voltage to the first data line, applying a second voltage to the second data line such that a voltage value of the second data line changes from a positive polarity to a negative polarity, and applying a third voltage to the third data line such that a voltage value of the third data line changes from a negative polarity to a positive polarity, the application of the first voltage being prior to the application of each of the second and third voltages.

18. The non-transitory computer-readable storage medium of claim 13, wherein the first set includes a first data line and a second data line, the first data line being adjacent to the second data line, the second set includes a third data line, the third data line being adjacent to the first data line, and wherein sequentially applying voltages to the first set includes applying a first voltage to the first data line, applying a second voltage to the second data line such that the polarity of a voltage value of the second data line changes, and sequentially applying voltages to the second set includes applying a third voltage to the third data line such that the polarity of a voltage value of the third data line changes, the application of the first voltage being prior to the application of each of the second and third voltages, the second voltage having a polarity that is opposite the polarity of the third voltage.

19. The non-transitory computer-readable storage medium of claim 13, wherein the first and second display pixels are adjacent, the first set includes a first data line and a second data line, the first and second data lines being adjacent to each other, and the second set includes a third data line and a fourth data line, the third and fourth data lines being adjacent to each other, and wherein:

sequentially applying voltages to the first set includes applying a first voltage to the first data line, and applying a second voltage to the second data line after the application of the first voltage, the application of the second voltage changing the polarity of a voltage value of the second data line, the polarity of the second voltage being the same as the polarity of the first voltage; and

sequentially applying voltages to the second set includes applying a third voltage to the third data line, and applying a fourth voltage to the fourth data line after the application of the third voltage, the application of the fourth voltage changing the polarity of a voltage value of the fourth data line, the polarity of the fourth voltage being opposite of the polarity of the third voltage.

20. The non-transitory computer-readable storage medium of claim 13, wherein the line of display pixels further includes a third display pixel associated with a third set of data lines and a fourth display pixel associated with a fourth set of data lines, the method further comprising:

sequentially applying voltages to the third set of data lines in a third write sequence of the data lines during the update of the line of display pixels; and

sequentially applying voltages to the fourth set of data lines in a fourth write sequence of the data lines, during the update of the line of display pixels,

wherein the each of the first, second, third, and fourth write sequences are different from each other.

21. A display apparatus, comprising:

a display including a plurality of display pixels that are each associated with a set of a plurality of data lines; and

a processor programmed for scanning the display by

electrically connecting each display pixel in a line of the display pixels to the associated set of data lines during an update of the line of display pixels, the line of display pixels including a first display pixel associated with a first set of data lines and a second display pixel associated with a second set of data lines,

sequentially applying voltages to the first set of data lines in a first write sequence of the data lines during the update of the line of display pixels, and

sequentially applying voltages to the second set of data lines in a second sequence of the data lines, different than the first write sequence, during the update of the line of display pixels.

22. The display apparatus of claim 21, wherein each set of data lines in the display includes a left data line, a center data line, and a right data line, and wherein the processor is further programmed for sequentially applying voltages to the first set includes applying a first voltage to the center data line in the first set, and sequentially applying voltages to the second set includes applying a second voltage to the center data line in the second set, the second voltage being applied concurrently with the application of the first voltage.

23. The display apparatus of claim 21, wherein the first and second display pixels are adjacent, and wherein the processor is further programmed for sequentially applying voltages to the first set by applying a first voltage to a first data line in the first set, and sequentially applying voltages to the second set by applying a second voltage to a second data line in the second set, the second voltage being applied concurrently with the application of the first voltage, and the first and second data lines being adjacent data lines.

24. The display apparatus of claim 21, wherein the first write sequence and second write sequence form a pattern that is repeated in adjacent pairs of display pixels.

25. The display apparatus of claim 21, wherein the first set includes a first data line, a second data line, and a third data line, the first data line being adjacent to each of the second and third data lines, and wherein the processor is further programmed for sequentially applying voltages to the first set by applying a first voltage to the first data line, applying a second voltage to the second data line such that a voltage value of the second data line changes from a positive polarity to a negative polarity, and applying a third voltage to the third data line such that a voltage value of the third data line changes from a negative polarity to a positive polarity, the application of the first voltage being prior to the application of each of the second and third voltages.