# US 10,123,005 B2 · Displays with unit-specific display identification data

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- Number: US 10,123,005 B2
- Document ID: US10123005B2
- Status: Granted
- Kind: B2
- Application number: 15/048,365
- Filed: 2016-02-19
- Published: 2016-09-08
- Granted: 2018-11-06
- Earliest claimed: 2015-03-06
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Mingxia Gu; Andrew P. Aitken; Bongsun Lee; Gabriel Marcu; Ian C. Hendry; Jun Qi; Victor H. Yin; Wei Chen; Yanming Li
- Web page: https://patentgrep.com/patent/US10123005B2

## CPC

- H04N 17/04: for receivers
- 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)}
- G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
- G09G 2320/0666: for control of colour parameters, e.g. colour temperature
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- G09G 2320/0693: Calibration of display systems
- G09G 2370/042: for monitor identification
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A display may store extended display identification data for communicating the capabilities of the display to a source device such as a graphics processing unit. The extended display identification data may include a red primary color value, a green primary color value, and a blue primary color value. The primary color values in the extended display identification data may be determined during manufacturing. For example, a light sensor may measure the native primary colors of the display, and calibration computing equipment may determine if the native primary colors of the display are within a target color gamut. If the native primary colors of the display are outside of the target color gamut by an amount larger than a threshold, the primary color values in the extended display identification data may be adjusted to account for the color variation.

## Claims

### Claim 1

A method for calibrating a display during manufacturing, comprising:
with a light sensor, measuring a primary color value of the display;
with calibration computing equipment, determining whether the measured primary color value is within a target color gamut; and
with the calibration computing equipment, generating extended display identification data based on whether the measured primary color value of the display is within the target color gamut, wherein generating the extended display identification data comprises storing the measured primary color value in an extended display identification data file when the measured primary color value is outside of the target color gamut by an amount larger than a predetermined threshold.

### Claim 2 (depends on 1)

The method defined in claim 1 wherein the extended display identification data comprises first, second, and third color values and wherein generating the extended display identification data comprises determining the first color value based on whether the measured primary color value of the display is within the target color gamut.

### Claim 3 (depends on 2)

The method defined in claim 2 wherein determining whether the measured primary color value is within the target color gamut comprises determining that the measured primary color value is outside of the target color gamut.

### Claim 4 (depends on 3)

The method defined in claim 3 wherein the target color gamut is defined by first, second, and third target primary color values, the method further comprising:
in response to determining that the measured primary color value is outside of the target color gamut, determining whether a difference between the measured primary color value and the first target primary color value is greater than the predetermined threshold.

### Claim 5 (depends on 4)

The method defined in claim 4 further comprising:
in response to determining that the difference between the measured primary color value and the first target primary color value is greater than the predetermined threshold, determining the first color value in the extended display identification data to be equal to the measured primary color value.

### Claim 6 (depends on 4)

The method defined in claim 4 further comprising:
in response to determining that the difference between the measured primary color value and the first target primary color value is greater than the predetermined threshold, determining which color bin out of a plurality of color bins the measured primary color value is located in.

### Claim 7 (depends on 6)

The method defined in claim 6 wherein the plurality of color bins is based on previously gathered color data from a plurality of displays.

### Claim 8 (depends on 1)

The method defined in claim 1 wherein the extended display identification data comprises first, second, and third color values and wherein generating the extended display identification data comprises determining the first color value to be equal to the measured primary color value when the measured primary color value of the display is not within the target color gamut, the method further comprising:
with the light sensor, measuring two additional primary color values of the display;
with the calibration computing equipment, determining whether the two additional measured primary color values are within the target color gamut; and
with the calibration computing equipment, determining the second and third color values based on whether the two additional measured primary color values are within the color gamut.

### Claim 9 (depends on 8)

The method defined in claim 8 wherein the first, second, and third color values comprise chromaticity coordinates for a red channel, chromaticity coordinates for green channel, and chromaticity coordinates for a blue channel.

### Claim 10 (depends on 1)

The method defined in claim 1 wherein the target color gamut is a DCI P3 color gamut.

### Claim 11 (depends on 1)

The method defined in claim 1 further comprising:
storing the extended display identification data in the display.

### Claim 12

A method for calibrating a display during manufacturing, comprising:
with calibration computing equipment, gathering gamma information from the display;
extracting primary color information from the gamma information, wherein the primary color information comprises a first measured primary color value, a second measured primary color value, and a third measured primary color value; and
generating extended display identification data based on the extracted primary color information, wherein generating the extended display identification data comprises storing the first measured primary color value, the second measured primary color value, and the third measured primary color value in an extended display identification data file when the first, second, and third measured primary color values are outside of a target color space by an amount larger than a threshold.

### Claim 13 (depends on 12)

The method defined in claim 12 wherein the first, second, and third measured primary color values comprise a red value, a green value, and a blue value, the method further comprising:
storing the extended display identification data in the display.

### Claim 14 (depends on 12)

The method defined in claim 12 further comprising:
determining whether the first, second, and third measured primary color values are within the target color space.

### Claim 15 (depends on 14)

The method defined in claim 14 wherein generating the extended display identification data comprises generating the extended display identification data based on whether the first, second, and third measured primary color values are within the target color space.

### Claim 16

A display that displays colors within a color gamut defined by first, second, and third primary color values, comprising:
an array of display pixels; and
a timing controller that provides digital display data to the array of display pixels and that stores extended display identification data, wherein the extended display identification data includes first, second, and third measured primary color values that are outside of the color gamut by an amount larger than a threshold, wherein the first, second, and third measured primary color values in the extended display identification data are different than the first, second, and third primary color values that define the color gamut, and wherein the first, second, and third measured primary color values in the extended display identification data are based on color sensor measurements gathered during manufacturing.

### Claim 17 (depends on 16)

The display defined in claim 16 wherein the color gamut comprises a DCI P3 color gamut.

### Claim 18 (depends on 16)

The display defined in claim 16 wherein the first, second, and third measured primary color values in the extended display identification data comprise a red color value, a green color value, and a blue color value.

### Claim 19 (depends on 16)

The display defined in claim 16 wherein the timing controller provides the extended display identification data to a graphics processing unit to communicate the color gamut of the display to the graphics processing unit.