Device and method for panel conditioning

Patent metadata

Field	Value
Publication number	US-11380260-B2
Application number	US-201816603189-A
Country	US
Kind code	B2
Filing date	Mar 27, 2018
Priority date	Apr 7, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

An electronic device comprises a controller. The controller is configured to provide a first signal to a display of the electronic device to turn off the display. The controller is also configured to provide a second signal to the display to alter a gate source voltage of a drive transistor coupled to a light emitting diode (LED) of a pixel of the display while the display is turned off.

First claim

What is claimed is:

1. An electronic device, comprising a controller configured to:
provide a first signal to a pixel of a display of the electronic device when the displayed is to be turned off to disconnect a drive transistor coupled to a light emitting diode (LED) of the pixel from a power source; and
provide a second signal to the display to alter a gate-to-source voltage of the drive transistor while the display is turned off, wherein the controller is configured to provide the second signal as a waveform signal.

2. The electronic device of claim 1 , wherein the controller is configured to provide the second signal to alter a gate-to-source voltage of a second drive transistor coupled to a second LED of second pixel of the display while the display is turned off.

3. The electronic device of claim 1 , wherein the controller is configured to prevent emission of light from the display during a period of time in which the second signal is provided to the display.

4. The electronic device of claim 1 , wherein the controller is configured to determine the waveform signal provided based on a characteristic of the electronic device.

5. The electronic device of claim 4 , wherein the controller is configured to determine the waveform signal by determining at least one of an amplitude of a waveform, a frequency of the waveform, or a duty cycle of the waveform based on the characteristic of the electronic device.

6. The electronic device of claim 1 , wherein the controller is configured to determine the waveform signal provided based on stored image data of the display.

7. The electronic device of claim 6 , wherein the controller is configured to determine the waveform signal by determining at least one of an amplitude of a waveform, a frequency of the waveform, or a duty cycle of the waveform based on the stored image data of the display.

8. A tangible, non-transitory computer-readable medium configured to store instructions executable by a processor of an electronic device to:
deactivate a first portion of a display of the electronic device;
provide a first control signal to the first portion of the display to prevent emission of light from the first portion of the display during a period of time in which the first portion of the display is deactivated; and
while providing the first control signal:
provide a second control signal to the display to modify a gate-to-source voltage of a drive transistor coupled to a light emitting diode (LED) of the first portion of the display; and
provide a third control signal to modify an additional gate-to-source voltage of an additional drive transistor coupled to an additional LED of an additional pixel of the display.

9. The non-transitory computer-readable medium of claim 8 , comprising instructions to control an output of a power supply coupled to the drive transistor to prevent the emission of light from the LED during the period of time in which the display is deactivated.

10. The non-transitory computer-readable medium of claim 8 , comprising instructions to control a switch coupled to the drive transistor to prevent the emission of light from the LED during the period of time in which the display is deactivated.

11. The non-transitory computer-readable medium of claim 8 , comprising instructions to sense at least one of an operational characteristic of the display, an attribute affecting the display, and an input to the display.

12. The non-transitory computer-readable medium of claim 8 , comprising instructions to transmit image data for display on a second portion of the display of the electronic device during the period of time in which the first portion of the display is deactivated.

13. The non-transitory computer-readable medium of claim 8 , comprising instructions to modify a second gate-to-source voltage of a second drive transistor coupled to a second LED of the first portion of the display while the display is deactivated.

14. A method, comprising:
deactivating a first portion of a display of an electronic device after presenting image data via the first portion of the display; and
modifying a gate-to-source voltage of a drive transistor coupled to a light emitting diode (LED) of the first portion of the display based at least in part on a control signal generated based on the image data while the display is deactivated.

15. The method of claim 14 , comprising sensing at least one of an operational characteristic of the display, an attribute affecting the display, and an input to the display while the display is deactivated.

16. The method of claim 14 , comprising sensing at least one of an operational characteristic of the display, an attribute affecting the display, and an input to the display while the gate-to-source voltage of the drive transistor is being modified.

17. The method of claim 14 , comprising generating the control signal as a waveform signal.

18. The method of claim 14 , comprising generating the control signal as a fixed bias voltage value.

19. The method of claim 18 , comprising determining the fixed bias voltage value based on a characteristic of the electronic device.

20. The method of claim 18 , comprising determining the fixed bias voltage value based on stored image data of the display.

Assignees

• Apple Inc

Inventors

• Tan Junhua
• Brahma Kingsuk
• Ryu Jie Won
• Gao Shengkui
• Shen Shiping
• Gharghi Majid
• Nho Hyunwoo
• Hwang Injae
• Murugan Kavinaath
• Chang Sun-Il
• Lin Chin-Wei
• Kim Hyunsoo
• Zhang Rui
• Richmond Jesse Aaron
• Wang Yun
• Lin Hung Sheng

Classifications

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title