Long-term history of display intensities

Patent metadata

Field	Value
Publication number	US-10699622-B2
Application number	US-201815874799-A
Country	US
Kind code	B2
Filing date	Jan 18, 2018
Priority date	Jun 4, 2017
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A data processing system can store a long-term history of pixel luminance values in a secure memory and use those values to create burn-in compensation values that are used to mitigate burn-in effect on a display. The long-term history can be updated over time with new, accumulated pixel luminance values.

First claim

What is claimed is:

1. A non-transitory machine readable medium storing executable instructions which when executed by a data processing system cause the data processing system to perform a method comprising:
storing a long-term history in a secure memory in a secure processing system, the long-term history storing, for each pixel in a plurality of pixels in a display, a value representing a long-term display intensity;
encrypting, by the secure processing system for each pixel in the plurality of pixels, the long-term history to create an encrypted long-term history;
transmitting the encrypted long-term history from memory in the secure processing system to a non-volatile storage managed by a file system maintained by an application processing system;
transmitting, during boot up of the data processing system, the encrypted long-term history from the non-volatile storage managed by the file system to memory in the secure processing system;
decrypting, by the secure processing system, the encrypted long-term history to obtain the long-term display intensity for each pixel;
generating, for each pixel, a compensation value based on the long-term display intensity for each pixel, the compensation value to mitigate a burn-in effect on the display;
transmitting, from the secure processing system to the application processing system, the compensation value for each pixel for use in compensating for burn-in effect on the display.

2. The medium as in claim 1 wherein the file system maintains user files in a first partition in the non-volatile storage, wherein the file system is not a component of the secure processing system and wherein the method further comprises:
compressing and encrypting, by the secure processing system, the long-term history to create a compressed and encrypted long-term history;
transmitting the compressed and encrypted long-term history to a second non-volatile storage maintained by the application processing system.

3. The medium as in claim 2 wherein the encrypted long-term history is stored in the first partition and is a primary backup of the long-term history and is used at boot up of the data processing system to read the long-term history from the first partition into memory in the secure processing system.

4. The medium as in claim 3 wherein the compressed and encrypted long-term history is compressed with a lossy compression algorithm and is a secondary backup of the long-term history that is used at boot up of the data processing system when the primary backup fails.

5. The medium as in claim 3 wherein the encrypted long-term history and the compressed and encrypted long-term history are associated with a display identifier that uniquely identifies the display.

6. The medium as in claim 3 wherein the second non-volatile storage is a second partition of the non-volatile storage.

7. The medium as in claim 3 wherein the method further comprises:
uploading the compressed and encrypted long-term history to a user's private cloud archive storage account.

8. The medium as in claim 1 , wherein the method further comprises:
generating, by the application processing system, a downsampled set of compensation values from at least a subset of a set of data that includes the compensation value for each pixel;
storing, by the application processing system, the downsampled set of compensation values in non-volatile storage for use in compensating for burn-in effect on the display during at least a portion of the boot up of the data processing system.

9. The medium as in claim 8 , wherein the method further comprises:
compensating for burn-in effect during at least an initial portion of the boot-up of the data processing system using the downsampled set of compensation values;
compensating, for each pixel, for burn-in effect after the initial portion using the compensation value for each pixel.

10. The medium as in claim 1 , wherein the method further comprises:
generating burn-in metrics for groups of pixels in the plurality of pixels, the burn-in metric for each group corresponding to a common range of long-term history values for each pixel in the group;
storing the burn-in metric for each group of pixels in a second secure memory in the secure processing system; and
transmitting the burn-in metrics from the second secure memory in the secure processing system to a second non-volatile storage managed by the file system maintained by the application processing system.

11. The medium as in claim 1 , wherein the method further comprises:
accumulating, in an accumulation buffer in the application processing system, burn-in statistics of display intensities; and
updating the long-term history, in the secure memory in the secure processing system, with the accumulated burn-in statistics.

12. The medium of claim 11 , the method further comprising:
generating burn-in metrics for groups of pixels in the plurality of pixels, the burn-in metric for each group corresponding to a common range of a long-term history values for each pixel in the group;
storing the burn-in metric for each group of pixels in a second secure memory in the secure processing system; and
transmitting the burn-in metrics from the second secure memory in the secure processing system to a second non-volatile storage managed by the file system maintained by the application processing system.

13. A method comprising:
storing a long-term history in a secure memory in a secure processing system, the long-term history storing, for each pixel in a plurality of pixels in a display, a value representing a long-term display intensity;
encrypting, by the secure processing system for each pixel in the plurality of pixels, the long-term history to create an encrypted long-term history;
transmitting the encrypted long-term history from memory in the secure processing system to a non-volatile storage managed by a file system maintained by an application processing system;
transmitting, during boot up of the data processing system, the encrypted long-term history from the non-volatile storage managed by the file system to memory in the secure processing system;
decrypting, by the secure processing system, the encrypted long-term history to obtain the long-term display intensity for each pixel;
generating, for each pixel, a compensation value based on the long-term display intensity for each pixel, the compensation value to mitigate a burn-in effect on the display;
transmitting, from the secure processing system to the application processing system, the compensation value for each pixel for use in compensating for burn-in effect on the display.

14. The method as in claim 13 wherein the file system maintains user files in a first partition in the non-volatile storage, wherein the file system is not a component of the secure processing system and wherein the method further comprises:
compressing and encrypting, by the secure processing system, the long-term history to create a compressed and encrypted long-term history;
transmitting the compressed and encrypted long-term history to a second non-volatile storage maintained by the application processing system.

15. The method as in claim 14 wherein the encrypted long-term history is stored in the first partition and is a primary backup of the long-term history and is used at boot up of the data processing system to read the long-term history from the first partition into memory in the secure processing system.

16. The method as in claim 15 wherein the compressed and encrypted long-term history is compressed with a lossy compression algorithm an

Assignees

• Apple Inc

Inventors

• Thompson Ross
• Cote Guy
• Tann Christopher P
• Hauck Jerrold V
• Hendry Ian C
• Heppolette Vanessa C
• Machalek Adam J
• Dunn Alan M
• Sazegari Ali
• Lindberg Lars M
• Spence Arthur L

Classifications

• G06F9/4401 Primary

  Bootstrapping (security arrangements therefor G06F21/57) · CPC title

• G09G3/006

  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) · CPC title

• G06F3/0622

  in relation to access · CPC title

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2330/026

  Arrangements or methods related to booting a display · CPC title