IP Library › Granted Patent US 11,676,556
Granted Patent B2
US 11,676,556 · App. 17/647,126 · Granted Jun 13, 2023

Row crosstalk mitigation

Inventors: Vehbi Calayir (Santa Clara, CA); Rodrigo Calderon Rico (Cupertino, CA); Bret Rothenberg (Los Altos, CA); Chengrui Le (San Jose, CA)
Assignee: APPLE INC.
G09G3/3688G09G3/3283G09G3/3291G09G2320/0209
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Quick Facts
Patent No.
US 11,676,556
App. No.
17/647,126
Granted
Jun 13, 2023
Kind
B2
Abstract

A method and light-emitting diode (LED) device configured to compensate for crosstalk between rows of the LED device.

Claims (70)

1. An apparatus comprising:

a light emitting diode (LED) display panel comprising a plurality of light emitting pixels divided into rows, the rows of light emitting pixels each further divided into at least one region;

a row driver is configured to receive image data from a graphics processing unit, the row driver is configured to compensate for crosstalk between the rows of light emitting pixels using direct current (DC) compensation for crosstalk, the direct current compensation for crosstalk further comprising:

calculating peak current for each LED pixel of the display panel;

using the peak current for each pixel to calculate a DC change in V LED (ΔV DC ) for that LED pixel for every backlight update;

using ΔV DC for each LED pixel to calculate a charge loss (ΔQ loss_DC ) for that LED pixel;

using ΔQ loss_DC for each LED pixel to calculate a change in luminance (Δlum %_ DC ) for that LED pixel;

adjusting the peak current for each LED pixel based on Δlum %_ DC for that LED pixel;

and the row driver is further configured, to output crosstalk compensated image data;

switching circuitry configured to receive the crosstalk compensated image data and configured to route the crosstalk compensated image data to the display panel for display.

2. The apparatus of claim 1 wherein the apparatus is a tablet computer, mobile phone, augmented reality display, notebook computer, computer display, or digital watch.

3. A method comprising:

receiving image data from a graphics-processing unit by a row driver;

compensating for crosstalk between rows of light emitting pixels in a display panel by the row driver using direct current (DC) compensation for crosstalk, the direct current compensation for crosstalk further comprising:

calculating a peak current for each LED pixel of the display panel;

using the peak current for each pixel to calculate a DC change in V LED (ΔV DC ) for that LED pixel for every backlight update;

using ΔV DC for each LED pixel to calculate a charge loss (ΔQ loss_DC ) for that LED pixel;

using ΔQ loss_DC for each LED pixel to calculate a change in luminance (Δlum %_ DC ) for that LED pixel;

adjusting the peak current for each LED pixel based on Δlum %_ DC for that LED pixel;

outputting crosstalk compensated image data to switching circuitry;

receive the crosstalk compensated image data by the switching circuitry; and,

routing the crosstalk compensated image data to the display panel for display.

4. The method of claim 3 wherein the display panel is incorporated in a tablet computer, mobile phone, augmented reality display, notebook computer, computer display, or digital watch.

5. A non-transitory computer-readable storage medium encoded with data and instructions, when read by a computer causes the computer to:

receive image data from a graphics-processing unit by a row driver;

compensate for crosstalk between rows of light emitting pixels in a display panel by the row driver using direct current (DC) compensation for crosstalk, the direct current compensation further comprising:

calculating a peak current for each LED pixel of the display panel;

using the peak current for each pixel to calculate a DC change in V LED (ΔV DC ) for that LED pixel for every backlight update;

using ΔV DC for each LED pixel to calculate a charge loss (ΔQ loss_DC ) for that LED pixel;

using ΔQ loss_DC for each LED pixel to calculate a change in luminance (Δlum %_ DC ) for that LED pixel;

adjusting the peak current for each LED pixel based on Δlum % DC for that LED pixel;

output crosstalk compensated image data to switching circuitry;

receive the crosstalk compensated image data by the switching circuitry; and,

route the crosstalk compensated image data to the display panel for display.

6. The non-transitory computer-readable storage medium of claim 5 wherein the display panel is incorporated in a tablet computer, mobile phone, augmented reality display, notebook computer, computer display, or digital watch.

7. An apparatus comprising:

a light emitting diode (LED) display panel comprising a plurality of light emitting pixels divided into rows, the rows of light emitting pixels each further divided into at least one region;

a row driver is configured to receive image data from a graphics processing unit, the row driver is configured to compensate for crosstalk between the rows of light emitting pixels using alternating current (AC) compensation for crosstalk, the alternating current compensation for crosstalk further comprising:

using an average current to calculate AC output voltage (Vout_ AC ) for each of the rows for every backlight update;

using Vout_ AC to calculate a AC change in V LED (ΔV AC ) for each of the rows;

using ΔV AC to calculate a charge loss (ΔQloss_ DC ) for each LED pixel;

using ΔQloss_ AC for each LED pixel to calculate a change in luminance (Δlum %_ AC ) for that LED pixel;

adjusting the average current for each LED pixel based on Δlum %_ AC for that LED pixel;

and the row driver is further configured to output crosstalk compensated image data;

switching circuitry configured to receive the crosstalk compensated image data and configured to route the crosstalk compensated image data to the display panel for display.

8. The apparatus of claim 7 wherein the apparatus is a tablet computer, mobile phone, augmented reality display, notebook computer, computer display, or digital watch.

9. A method comprising:

receiving image data from a graphics-processing unit by a row driver;

compensating for crosstalk between rows of light emitting pixels in a display panel by the row driver using alternating current (AC) compensation for crosstalk, the alternating current compensation for crosstalk further comprising:

using an average current to calculate AC output voltage (Vout_ AC ) for each of the rows for every backlight update;

using Vout_ AC to calculate a AC change in V LED (ΔV AC ) for each of the rows;

using ΔV AC to calculate a charge loss (ΔQloss_ AC ) for each LED pixel;

using ΔQloss_ AC for each LED pixel to calculate a change in luminance (Alum %_ AC ) for that LED pixel;

adjusting the average current for each LED pixel based on Δlum % AC for that LED pixel;

outputting crosstalk compensated image data to switching circuitry;

receive the crosstalk compensated image data by the switching circuitry; and,

routing the crosstalk compensated image data to the display panel for display.

10. The method of claim 9 wherein the display panel is incorporated in a tablet computer, mobile phone, augmented reality display, notebook computer, computer display, or digital watch.

11. A non-transitory computer-readable storage medium encoded with data and instructions, when read by a computer causes the computer to:

receive image data from a graphics-processing unit by a row driver;

compensate for crosstalk between rows of light emitting pixels in a display panel by the row driver using alternating current (AC) compensation for crosstalk, the alternating current compensation for crosstalk further comprising;

using an average current to calculate AC output voltage (Vout_AC) for each of the rows for every backlight update;

using Vout_ AC to calculate a AC change in V LED (ΔV AC ) for each of the rows;

using ΔV AC to calculate a charge loss (ΔQloss_ AC ) for each LED pixel;

using ΔQloss_ AC for each LED pixel to calculate a change in luminance (Δlum %_ AC ) for that LED pixel;

adjusting the average current for each LED pixel based on Δlum %_ AC for that LED pixel;

output crosstalk compensated image data to switching circuitry;

receive the crosstalk compensated image data by the switching circuitry; and,

route the crosstalk compensated image data to the display panel for display.

12. The non-transitory computer-readable storage medium of claim 11 wherein the display panel is incorporated in a tablet computer, mobile phone, augmented reality display, notebook computer, computer display, or digital watch.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 6, 2022
From: CALAYIR, VEHBI; CALDERON RICO, RODRIGO; ROTHENBERG, BRET; LE, CHENGRUI
To: APPLE INC.
Reel/Frame 058579/0397 →
Continuity (2)
Provisional Application 63134328 · Jan 6, 2021
Related Publication 20220215812A1 · Jul 7, 2022
Cited By (1)
US 12,333,995