Device and method for panel conditioning
The present disclosure relates generally to systems and methods that may reduce a reduction in visual artifacts related to hysteresis of a light emitting diode (LED) electronic display. In one example, an electronic device may include a controller. The controller is may provide a signal to a pixel of a display of the electronic device while at least a portion of the display is turned off. The signal may include a first current and a second current. The first current may be designed to increase an ambient temperature corresponding to the pixel. The second current may be generated as part of an active panel conditioning operation. By applying the first current and the second current, hysteresis settling times from the pixel may improve, therefore improving speeds of sensing and compensation operations of the electronic device.
1. An electronic device, comprising:
a display having a plurality of pixels, wherein each pixel of the plurality of pixels comprises:
a respective light-emitting device;
a respective transistor coupled to the respective light-emitting device and configured to deliver current to the respective light-emitting device when the respective transistor is on; and
a respective switch coupled to the respective transistor to direct the current away from the respective light-emitting device when the respective switch is closed; and
a controller configured to:
transmit at least a first control signal to a first pixel of the plurality of pixels to turn on a first transistor of the first pixel and to close a first switch of the first pixel;
transmit an active panel conditioning current through the first transistor and the first switch while bypassing a first light-emitting device of the first pixel; and
in response to an ambient temperature of the display being less than a threshold temperature value, transmit an additional heat-generating current along with the active panel conditioning current through the first transistor and the first switch while bypassing the first light-emitting device of the first pixel.
2. The electronic device of claim 1 , wherein the controller is configured to provide the active panel conditioning current at a fixed bias voltage value.
3. The electronic device of claim 2 , wherein the controller is configured to determine the fixed bias voltage value based on a characteristic of the electronic device.
4. The electronic device of claim 2 , wherein the controller is configured to determine the fixed bias voltage value based on stored image data of the display.
5. The electronic device of claim 1 , wherein the controller is configured to provide the active panel conditioning current as a waveform signal, and wherein the additional heat-generating current is provided to increase an amplitude of the active panel conditioning current.
6. The electronic device of claim 5 , wherein the controller is configured to determine the waveform signal provided based on a characteristic of the electronic device.
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 the waveform signal, a frequency of the waveform signal, or a duty cycle of the waveform signal based on the characteristic of the electronic device.
8. The electronic device of claim 5 , wherein the controller is configured to generate the waveform signal provided based on stored image data of the display.
9. The electronic device of claim 8 , wherein the controller is configured to determine the waveform signal by determining at least one of an amplitude of the waveform signal, a frequency of the waveform signal, or a duty cycle of the waveform signal based on the stored image data of the display.
10. The electronic device of claim 1 , wherein the controller is configured to provide the active panel conditioning current to alter a gate source voltage of a drive transistor coupled to a light-emitting diode (LED) of the first pixel.
11. The electronic device of claim 1 , wherein the first switch being closed is configured to prevent emission of light from the display during a period of time in which the active panel conditioning current is provided to the display.
12. A tangible, non-transitory computer-readable medium configured to store instructions executable by a processor of an electronic device to:
perform an active panel conditioning operation by:
transmitting at least a control signal to a pixel of a display of the electronic device to turn on a transistor of the pixel and to close a switch of the pixel;
transmitting an active panel conditioning current through the transistor and the switch while bypassing a light-emitting device of the pixel; and
in response to an ambient temperature of the display being less than a threshold temperature value, transmitting an additional heat-generating current with the active panel conditioning current through the transistor and the switch while bypassing the light-emitting device; and
in response to completing the active panel conditioning operation, perform a sensing operation.
13. The non-transitory computer-readable medium of claim 12 , comprising instructions to pause an output from a power supply coupled to the display while the switch is closed.
14. The non-transitory computer-readable medium of claim 12 , wherein the light-emitting device comprises a light-emitting diode (LED), and wherein the switch electrically couples the transistor and a supply line when closed to transmit at least the active panel conditioning current.
15. The non-transitory computer-readable medium of claim 12 , comprising instructions to sense, during the sensing operation, at least one of an operational characteristic of the display, an attribute affecting the display, and an input to the display.
16. The non-transitory computer-readable medium of claim 12 , comprising instructions to select a value of the additional heat-generating current based at least in part on a temperature difference between the ambient temperature and the threshold temperature value.
17. The non-transitory computer-readable medium of claim 12 , comprising instructions to perform at least a portion of the sensing operation substantially simultaneous to at least a portion of an additional active panel conditioning operation performed to an additional pixel.
18. A method, comprising:
operating a switch closed of a pixel of a display;
transmitting an active panel conditioning current through the switch while bypassing a light-emitting device of the pixel; and
in response to an ambient temperature being less than a threshold temperature value, transmitting an additional heat-generating current along with the active panel conditioning current through the switch while bypassing the light-emitting device.
19. The method of claim 18 , 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 switch is closed.
20. The method of claim 18 , comprising:
operating the switch open of the pixel; and
sensing at least one of an operational characteristic of the display, an attribute affecting the display, and an input to the display while a gate source voltage of a drive transistor of the pixel is modified.