Display calibration in electronic displays

• US 10,366,674 B1
• Filed: 12/27/2016
• Issued: 07/30/2019
• Est. Priority Date: 12/27/2016
• Status: Active Grant

• Current Assignee: META Platforms Technologies LLC (Meta Platforms, Inc. (f/k/a Facebook, Inc.))
• Original Assignee: Facebook Technologies, LLC (Meta Platforms, Inc. (f/k/a Facebook, Inc.))
• Inventors: Levin, Kieran Tobias
• Primary Examiner(s): Faulk, Devona E
• Assistant Examiner(s): Beard, Charles L
• Application Number:
  US15/391,681
• Time in Patent Office: 945 Days
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

A system calibrates luminance of an electronic display. The system includes an electronic display, a luminance detection device, and a controller. The luminance detection device is configured to measure luminance parameters of active sections of the electronic display. The controller is configured to instruct the electronic display to activate sections in a sparse pattern and in a rolling manner and instruct the luminance detection device to measure luminance parameters for each of the active sections in the sparse pattern. The controller generates calibration data based on the measured luminance parameters of sections in the sparse pattern.

Claims

1. A system comprising:

a one-dimensional photo-detector configured to measure luminance parameters of pixels of an electronic display, wherein the electronic display includes a plurality of columns of pixels and the luminance parameters include a brightness level for each of the measured pixels; and

a controller configured to;

instruct the electronic display to activate the pixels of the electronic display using a plurality of sparse patterns and each sparse pattern describes a respective subset of pixels within a single respective column, and for each sparse pattern;

there is a fixed number of inactive pixels between adjacent active pixels in the single respective column,

the respective subset of pixels within the respective column is sequentially presented in a rolling manner such that no two pixels of the electronic display are active over a same time period, and

the respective subset of pixels in the single respective column described by the sparse pattern are activated before advancing to another sparse pattern that describes a subset of pixels in an adjacent column,

instruct the one-dimensional photo-detector to measure luminance parameters for each of the pixels in each of the plurality of sparse patterns, and

generate calibration data based on the measured luminance parameters of the pixels in each of the plurality of sparse patterns, the calibration data including a brightness level adjustment to one or more of the pixels such that corresponding brightness levels of the one or more pixels are within a predetermined range of brightness levels.

2. The system of claim 1, wherein the controller is further configured to:

update the electronic display with the determined calibration data.

3. The system of claim 1, wherein the luminance parameters further comprise color wavelength values corresponding to light output from each of the measured pixels.

4. The system of claim 1, wherein the calibration data further includes a color adjustment to one or more of the pixels such that the colors values of corresponding pixels are within a predetermined range of color values.

5. The system of claim 4, wherein the brightness level adjustment is based in part on the color adjustment.

6. The system of claim 1, wherein the one-dimensional photo-detector is a photodiode.

7. The system of claim 1, wherein the controller is further configured to:

retrieve predetermined luminance parameters of each of the pixels in a sparse pattern of the plurality of sparse patterns;

calculate differences between the measured luminance parameters of each of pixels in the sparse pattern and corresponding predetermined luminance parameters of corresponding pixels; and

determine calibration data based in part on the calculated differences for each of pixels in the sparse pattern.

8. The system of claim 7, wherein the controller is further configured to:

determine a luminance quality based in part on the calculated differences.

9. The system of claim 8, wherein the controller is further configured to:

determine calibration data based on the calculated differences, responsive to the determined luminance quality indicating that the measured luminance parameters of the pixels deviate from corresponding predetermined luminance parameters of the corresponding pixels.

10. The system of claim 1, wherein each pixel includes a plurality of sub-pixels.

11. A method comprising:

activating pixels of an electronic display using a plurality of sparse patterns, the electronic display includes a plurality of columns of pixels and each sparse pattern describes a respective subset of pixels in a particular direction within a single respective column, and for each sparse pattern;

there is a fixed number of inactive pixels between adjacent active pixels in the single respective column,

the respective subset of pixels within the respective column is sequentially presented in a rolling manner such that no two pixels of the electronic display and are active over a same time period, and

the respective subset of pixels in the single respective column described by the sparse pattern are activated before advancing to another sparse pattern that describes a subset of pixels in an adjacent column;

measuring, by a one-dimensional photo-detector, luminance parameters for each of the pixels of the electronic display and, the luminance parameters include a brightness level for each of the measured pixels; and

determining calibration data based on the luminance parameters of the pixels in each of the plurality of sparse patterns measured by the one-dimensional photo-detector, the calibration data including a brightness adjustment to one or more pixels such that brightness levels of corresponding pixels are within a range of brightness levels.

12. The method of claim 11, further comprising updating the electronic display with the determined calibration data.

13. The method of claim 11, wherein the luminance parameters further comprise color wavelength values corresponding to light output from each of the measured pixels.

14. The method of claim 11, wherein the calibration data further includes a color adjustment to one or more of the pixels such that the colors values of corresponding pixels are within a predetermined range of color values.

15. The method of claim 11, wherein each pixel includes a plurality of sub-pixels.

16. A system comprising:

a one-dimensional photo-detector configured to measure luminance parameters of pixels of an electronic display, wherein the electronic display includes a plurality of columns of pixels and the luminance parameters include a brightness level and a color for each of the measured pixels, wherein each pixel is composed of a plurality of sub-pixels types, where different types of sub-pixels are configured to emit light at different colors of light; and

a controller configured to;

instruct the electronic display to activate sub-pixels of the same color type in the pixels of the electronic display using a plurality of sparse patterns and each sparse pattern describes a respective subset of sub-pixels within a single respective column, and for each sparse pattern;

there is a fixed number of inactive pixels between adjacent active pixels in the single respective column,

the respective subset of sub-pixels within the respective column is sequentially presented in a rolling manner such that no two sub-pixels of the electronic display are active over a same time period, and

the respective subset of pixels in the single respective column described by the sparse pattern are activated before advancing to another sparse pattern that describes a subset of pixels in an adjacent column,

instruct the one-dimensional photo-detector to measure luminance parameters for each of the pixels in each of the plurality of sparse patterns, and

generate calibration data based on the measured luminance parameters of the pixels in each of the plurality of sparse patterns, the calibration data including a brightness level adjustment to one or more of the pixels such that brightness levels of corresponding pixels are within a range of brightness levels, and a color adjustment to one or more of the pixels is such that colors of corresponding pixels are within a range of colors.