BLACK IMAGE INSERTION FOR CAPACITIVE SENSING
First Claim
1. A method comprising:
- transmitting a first display image for display on a first portion of a display screen of a display device;
transmitting a black image for display on the first portion of the display screen after outputting the first display image, wherein the black image comprises a plurality of contiguous display lines of the display screen;
identifying a transmitter electrode located substantially within the first portion of the display screen; and
driving a signal on the identified transmitter electrode to determine positional information when the black image is displayed on the first portion of the display screen.
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0 Petitions
Accused Products
Abstract
Embodiments of the invention generally provide, when performing capacitive sensing, driving a modulated signal on transmitter electrodes located only within a black image of the display device. When updating a display screen based on a newly received display frame, an input device may first insert the black image on the display screen. Once the black image is displayed, the input device may use the electrodes within the area of the screen displaying the black image to track the input object using capacitive sensing (e.g., determine if the user is pressing a finger or stylus on the screen). In this manner, performing capacitive sensing affects only the pixels displaying the black image which is not perceived by the user. After performing capacitive sensing using the electrodes, the input device may replace the black image with display data from the new display frame.
23 Citations
20 Claims
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1. A method comprising:
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transmitting a first display image for display on a first portion of a display screen of a display device; transmitting a black image for display on the first portion of the display screen after outputting the first display image, wherein the black image comprises a plurality of contiguous display lines of the display screen; identifying a transmitter electrode located substantially within the first portion of the display screen; and driving a signal on the identified transmitter electrode to determine positional information when the black image is displayed on the first portion of the display screen. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A display device comprising:
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a display screen; a plurality of transmitter electrodes configured for determining positional information using capacitive sensing; and a processor configured to; transmit a first display image for display on a first portion of the display screen, transmit a black image for display on the first portion of the display screen after outputting the first display image, wherein the black image comprises a plurality of contiguous display lines of the display screen, identify a first one of the transmitter electrodes located substantially within the first portion of the display screen, and drive a signal on the first transmitter electrode to determine positional information when the black image is displayed on the first portion of the display screen. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A processing system for a display device, the processing system comprising:
a display driver module configured to update a display screen, the display driver module configured to; transmit a first display image for display on a first portion of a display screen of a display device, and transmit a black image for display on the first portion of the display screen after outputting the first display image, wherein the black image comprises a plurality of contiguous display lines of the display screen; and
transmitter circuitry configured to;identify a transmitter electrode located substantially within the first portion of the display screen, and drive a signal on the identified transmitter electrode to determine positional information when the black image is displayed on the first portion of the display screen. - View Dependent Claims (16, 17, 18, 19, 20)
Specification