In-cell low power modes
First Claim
1. A processing system for a display device comprising an integrated sensing device, the processing system comprising:
- a display driver module configured to;
update a display of the display device with display frames in a display update mode;
enter a wait-for-sleep period in response to a first instruction; and
enter a display sleep mode in response to expiration of the wait-for-sleep period and a completion of one of the display frames;
a receiver module communicatively coupled with the display driver module and configured to;
receive resulting signals from a first plurality of sensor electrodes, the resulting signals comprising effects corresponding to a presence of an object in a sensing region associated with the first plurality of sensor electrodes; and
change from a first receiver state to a second receiver state in response to the first instruction and the expiration of the wait-for-sleep period, wherein the second receiver state corresponds to a receiver doze mode, and an output of the receiver module changes from a high voltage state to a low voltage state based on the receiver module entering the second receiver state; and
a transmitter module communicatively coupled with the receiver module and configured to;
change from a first transmitter state to a second transmitter state in response to sensing the output of the receiver module changing from the high voltage state to the low voltage state and the expiration of the wait-for-sleep period, wherein the first transmitter state corresponds to an active sensing mode, and the second transmitter state corresponds to a transmitter sleep mode; and
enter the active sensing mode from the transmitter sleep mode in response to a trigger signal from the receiver module, wherein the display driver module remains in the display sleep mode and the transmitter module is configured to drive modulated signals onto a second plurality of sensor electrodes in the active sensing mode.
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Accused Products
Abstract
Embodiments described herein include a method and apparatus for capacitive sensing in input devices integrated with a display device. In one embodiment, a processing system for a display device comprising an integrated capacitive sensing device is provided that includes a display driver module, a transmitter module, and a receiver module. The display driver and transmitter modules are configured to operate in a display update mode and a sleep mode. The receiver module is configured to, while operating in a doze mode, communicate with and trigger the transmitter module to enter the active sensing mode while the display driver module remains in the sleep mode when presence of an object is detected based on the resulting signals.
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Citations
20 Claims
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1. A processing system for a display device comprising an integrated sensing device, the processing system comprising:
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a display driver module configured to; update a display of the display device with display frames in a display update mode; enter a wait-for-sleep period in response to a first instruction; and enter a display sleep mode in response to expiration of the wait-for-sleep period and a completion of one of the display frames; a receiver module communicatively coupled with the display driver module and configured to; receive resulting signals from a first plurality of sensor electrodes, the resulting signals comprising effects corresponding to a presence of an object in a sensing region associated with the first plurality of sensor electrodes; and change from a first receiver state to a second receiver state in response to the first instruction and the expiration of the wait-for-sleep period, wherein the second receiver state corresponds to a receiver doze mode, and an output of the receiver module changes from a high voltage state to a low voltage state based on the receiver module entering the second receiver state; and a transmitter module communicatively coupled with the receiver module and configured to; change from a first transmitter state to a second transmitter state in response to sensing the output of the receiver module changing from the high voltage state to the low voltage state and the expiration of the wait-for-sleep period, wherein the first transmitter state corresponds to an active sensing mode, and the second transmitter state corresponds to a transmitter sleep mode; and enter the active sensing mode from the transmitter sleep mode in response to a trigger signal from the receiver module, wherein the display driver module remains in the display sleep mode and the transmitter module is configured to drive modulated signals onto a second plurality of sensor electrodes in the active sensing mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for operating a display device comprising an integrated sensing device, the method comprising:
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updating a display of the display device with display frames while a display module is in a display update mode; placing the display module in a wait-for-sleep period in response to a first instruction; placing the display module in a display sleep mode in response to an expiration of the wait-for-sleep period and a completion of one of the display frames; determining a presence of an object from signals received from first sensor electrodes by a receiver module; changing the receiver module from a first receiver state to a second receiver state in response to the first instruction and the expiration of the wait-for-sleep period, wherein the second receiver state corresponds to a receiver doze mode, and an output of the receiver module changes from a high voltage state to a low voltage state based on the receiver module entering the second receiver state; placing a transmitter module in an active sensing mode in response to a trigger signal provided by the receiver module, wherein the display driver module remains in the display sleep mode; changing the transmitter module from a first transmitter state to a second transmitter state in response to sensing the output of the receiver module changing from the high voltage state to the low voltage state, and the expiration of the wait-for-sleep period, wherein the first transmitter state corresponds to an active sensing mode, and the second transmitter state corresponds to a transmitter sleep mode; and driving modulated signals from the transmitter module onto second sensor electrodes of the capacitive sensing device while in the active sensing mode. - View Dependent Claims (17, 18, 19, 20)
updating images on the display device with the display driver module and driving transmitter signals from the transmitter module onto the second sensor electrodes for capacitive sensing while the transmitter module is in the active sensing mode.
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18. The method of claim 16 further comprising:
changing the output state of the receiver module from the second receiver state to the first receiver state in response to determining a lack of presence of an object from signals received from the first sensor electrodes by the receiver module operating in a second capacitive sensing mode.
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19. The method of claim 16, wherein the first instruction is received from a host processor.
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20. The method of claim 16 comprising:
driving the modulated signals onto one or more common electrodes while the transmitter module is in the active sensing mode.
Specification