Light-emitting diode displays with predictive luminance compensation

Patent metadata

Field	Value
Publication number	US-10453388-B2
Application number	US-201815967402-A
Country	US
Kind code	B2
Filing date	Apr 30, 2018
Priority date	Sep 14, 2015
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

An electronic device may be provided with a display. A content generator may generate frames of image data to be displayed on the display. The display may have an array of pixels that emit light to display images. The pixels may contain light-emitting devices such as organic light-emitting diodes, quantum dot light-emitting diodes, and light-emitting diodes formed from discrete semiconductor dies. As a result of aging, the light producing capabilities of the light-emitting devices may degrade over time. The electronic device may have a temperature sensor that gathers temperature measurements and an ambient light sensor. A pixel luminance degradation compensator may apply compensation factors to uncorrected pixel luminance values associated with the frames of image data to produce corresponding corrected pixel luminance values for the display. The compensation factors may be based on aging history information such as pixel luminance history, ambient light exposure, and temperature measurements.

First claim

What is claimed is:

1. An electronic device, comprising:
a display having pixels, each pixel having a respective light-emitting device;
control circuitry configured to display content on the pixels of the display;
an ambient light sensor; and
a pixel luminance degradation compensator implemented on the control circuitry configured to use ambient light sensor measurements from the ambient light sensor to compensate for light-exposure-induced pixel luminance degradation in the light-emitting devices, wherein the ambient light sensor measurements include ambient light spectrum information, and wherein the control circuitry is configured to use the ambient light spectrum information to compensate for the light-exposure-induced pixel luminance degradation.

2. The electronic device defined in claim 1 wherein the light-emitting devices comprise light-emitting diodes.

3. The electronic device defined in claim 2 wherein the ambient light sensor comprises a color ambient light sensor.

4. The electronic device defined in claim 1 wherein the control circuitry is configured to use the ambient light spectrum information to produce pixel aging factors for the pixels.

5. The electronic device defined in claim 1 wherein the control circuitry is configured to use the ambient light sensor to determine an amount that the pixels are exposed to ultraviolet light over time.

6. The electronic device defined in claim 5 wherein the control circuitry is configured to implement a pixel luminance degradation compensator and is configured to produce pixel aging factors for the pixel luminance degradation compensator based at least partly on the amount that the pixels are exposed to the ultraviolet light over time.

7. The electronic device defined in claim 1 wherein the control circuitry is configured to implement a pixel luminance degradation compensator.

8. The electronic device defined in claim 7 wherein the pixel luminance degradation compensator is configured to maintain pixel aging history information for the pixels.

9. The electronic device defined in claim 8 wherein the ambient light sensor comprises a color ambient light sensor configured to gather an ambient light spectrum and wherein the pixel luminance degradation compensator is configured to use the ambient light spectrum to maintain the pixel aging history information.

10. The electronic device defined in claim 9 further comprising a temperature sensor that provides temperature measurements to the pixel luminance degradation compensator, wherein the pixel luminance degradation compensator is configured to determine the pixel aging factors based at least partly based on the temperature measurements.

11. The electronic device defined in claim 10 wherein the pixel luminance degradation compensator is configured to adjust the pixel luminance values for the pixels by applying compensation factors to the pixel luminance values and wherein the compensation factors are based at least partly on the pixel aging factors.

12. An electronic device, comprising:
a display having pixels, wherein each of the pixels has a respective light-emitting diode;
an ambient light sensor configured to gather ambient light information; and
control circuitry on which a content generator and a pixel luminance degradation compensator are implemented, wherein the content generator is configured to produce image content for the display with uncorrected pixel luminance values and wherein the pixel luminance degradation compensator is configured to adjust the uncorrected pixel luminance values based at least partly on the history of the ambient light information to produce corresponding corrected pixel luminance values for the image content to compensate for ambient-light-induced pixel luminance degradation in the light-emitting diodes.

13. The electronic device defined in claim 12 wherein the pixel luminance degradation compensator is configured to produce the corrected pixel luminance values by applying compensation factors to the uncorrected pixel luminance values.

14. The electronic device defined in claim 13 wherein the light-emitting diodes comprise organic light-emitting diodes.

15. The electronic device defined in claim 13 wherein the light-emitting diodes comprise discrete crystalline semiconductor dies.

16. The electronic device defined in claim 12 further comprising a temperature sensor that gathers temperature measurements, wherein the pixel luminance degradation compensator is configured to produce the compensation factors at least partly based on the temperature measurements.

17. The electronic device defined in claim 16 wherein the pixel luminance degradation compensator is configured to produce the compensation factors based on encrypted pixel aging history information maintained in the control circuitry.

18. The electronic device defined in claim 17 wherein the pixel luminance degradation compensator is configured to adjust the uncorrected pixel luminance values based at least partly on the encrypted pixel luminance history information to produce corresponding corrected pixel luminance values for the image content.

19. An electronic device, comprising:
an organic light-emitting diode display having pixels;
a color ambient light sensor configured to gather ambient light sensor measurements indicative of an amount of exposure of the pixels to ultraviolet light over time; and
control circuitry on which a content generator and a pixel luminance degradation compensator are implemented, wherein the content generator is configured to produce image content for the display with uncorrected pixel luminance values and wherein the pixel luminance degradation compensator is configured to adjust the uncorrected pixel luminance values based at least partly on the amount of exposure of the pixels to ultraviolet light to compensate for ultraviolet-light-induced luminance degradation and produce corresponding corrected pixel luminance values for the image content.

Assignees

• Apple Inc

Inventors

• Lee Jiye
• Zhang Yifan
• Chen Chieh-Wei
• Koh Tae-Wook
• Chang Hongwei
• Drzaic Paul S

Classifications

• H05B45/20

  Controlling the colour of the light · CPC title

• H05B47/11

  by determining the brightness or colour temperature of ambient light · CPC title

• G09G2320/046

  Dealing with screen burn-in prevention or compensation of the effects thereof · CPC title

• G09G2360/144

  the light being ambient light · CPC title

• G09G3/32

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title