Display with dual-function capacitive elements
First Claim
1. A touch screen including a display region having display pixels and a non-display border region, the touch screen comprising:
- a plurality of first common voltage lines disposed in rows including at least one row having a plurality of first portions that are electrically separate in the at least one row in the display region;
a plurality of second common voltage lines disposed in columns including at least one column having a plurality of second portions that are electrically separate in the at least one column in the display region;
a plurality of first regions and a plurality of second regions, each region including a plurality of display pixels each having a capacitive element, wherein in the plurality of first regions, the capacitive elements are electrically connected together via one or more of each of the plurality of first and second portions of the first and second common voltage lines, and wherein in the plurality of second regions, the capacitive elements are electrically connected together by a plurality of third common voltage lines disposed in columns;
the plurality of first regions electrically separated from the plurality of second regions in the display region in a touch sensing mode of operation; and
wherein capacitive elements within each region are configured to provide a display function in a display mode of operation of the touch screen and to provide capacitive coupling between at least one region of the plurality of first regions serving as a drive region, and one region of the plurality of second regions serving as a sense region, in the touch sensing mode of operation.
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Abstract
A touch screen including display pixels with capacitive elements is provided. The touch screen includes first common voltage lines connecting capacitive elements in adjacent display pixels, and a second common voltage line connecting first common voltage lines. Groups of pixels can be formed as electrically separated regions by including breaks in the common voltage lines. The regions can include a drive region that is stimulated by stimulation signals, a sense region that receives sense signals corresponding to the stimulation signals. A grounded region can also be included, for example, between a sense region and a drive region. A shield layer can be formed of a substantially high resistance material and disposed to shield a sense region. A black mask line and conductive line under the black mask line can be included, for example, to provide low-resistance paths between a region of pixels and touch circuitry outside the touch screen borders.
121 Citations
28 Claims
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1. A touch screen including a display region having display pixels and a non-display border region, the touch screen comprising:
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a plurality of first common voltage lines disposed in rows including at least one row having a plurality of first portions that are electrically separate in the at least one row in the display region; a plurality of second common voltage lines disposed in columns including at least one column having a plurality of second portions that are electrically separate in the at least one column in the display region; a plurality of first regions and a plurality of second regions, each region including a plurality of display pixels each having a capacitive element, wherein in the plurality of first regions, the capacitive elements are electrically connected together via one or more of each of the plurality of first and second portions of the first and second common voltage lines, and wherein in the plurality of second regions, the capacitive elements are electrically connected together by a plurality of third common voltage lines disposed in columns; the plurality of first regions electrically separated from the plurality of second regions in the display region in a touch sensing mode of operation; and wherein capacitive elements within each region are configured to provide a display function in a display mode of operation of the touch screen and to provide capacitive coupling between at least one region of the plurality of first regions serving as a drive region, and one region of the plurality of second regions serving as a sense region, in the touch sensing mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a touch screen including a display region having display pixels and a non-display border region, the touch screen having a plurality of first common voltage lines disposed in rows including at least one row having a plurality of first portions that are electrically separate in the at least one row in the display region, a plurality of second common voltage lines disposed in columns including at least one column having a plurality of second portions that are electrically separate in the at least one column in the display region, a plurality of first regions and a plurality of second regions, each region including a plurality of display pixels each having a capacitive element, wherein in the plurality of first regions, the capacitive elements are electrically connected together via one or more of each of the plurality of first and second portions of the first and second common voltage lines, and wherein in the plurality of second regions, the capacitive elements are electrically connected together by one or more of a plurality of third common voltage lines disposed in columns, the plurality of first regions electrically separated from the plurality of second regions in the display region in a touch sensing mode of operation, and wherein capacitive elements within each region are configured to provide a display function in a display mode of operation of the touch screen and to provide capacitive coupling between at least one region of the plurality of first regions serving as a drive region, and one region of the plurality of second regions serving as a sense region, in the touch sensing mode of operation, the method comprising:
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operating the capacitive elements during the display mode of operation to produce an image on the touch screen; operating the capacitive elements during the touch sensing mode of operation to sense a touch event on or near the touch screen, wherein operating the capacitive elements during the touch sensing mode of operation comprises; driving the capacitive elements in the plurality of first regions of display pixels with a stimulation signal; and sensing electric fields with the capacitive elements in at least one of the plurality of second regions of display pixels, and wherein the display mode of operation and the touch sensing mode of operation alternate periodically. - View Dependent Claims (9, 10)
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11. A stackup of a touch screen including a display region having display pixels and a non-display border region, the stackup comprising:
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a plurality of gate lines; a plurality of data lines; the plurality of gate lines and the plurality of data lines coupled to the plurality of pixels for enabling display of data by the plurality of pixels; a plurality of first common voltage lines disposed in rows including at least one row having a plurality of first portions that are electrically separate in the at least one row in the display region; a plurality of second common voltage lines disposed in columns including at least one column having a plurality of second portions that are electrically separate in the at least one column in the display region; a plurality of first and second regions, each region including a plurality of display pixels each having a capacitive element, wherein in the plurality of first regions, the capacitive elements are electrically connected together via one or more portions of each of the first and second common voltage lines, and wherein in the plurality of second regions, the capacitive elements are electrically connected together by a plurality of third common voltage lines disposed in columns, and the plurality of first regions are electrically separated from the plurality of second regions in the display region in a touch sensing mode of operation, wherein the first regions are drive regions and the second regions are sense regions; at least one bus line forming part of an electrical connection that connects together ones of the plurality of first regions in the touch sensing mode of operation; and wherein the at least one bus line is disposed in the non-display border region of the display screen. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A touch sensing system comprising:
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a stackup of a touch screen including a display region having display pixels and a non-display border region comprising; a plurality of gate lines; a plurality of data lines; a plurality of first common voltage lines disposed in rows including at least one row having a plurality of first portions that are electrically separate in the at least one row in the display region; a plurality of second common voltage lines disposed in columns including at least one column having a plurality of second portions that are electrically separate in the at least one column in the display region; a plurality of first and second regions, each region including a plurality of display pixels each having a capacitive element, wherein in the plurality of first regions, the capacitive elements are electrically connected together via one or more portions of each of the first and second common voltage lines, and wherein in the plurality of second regions, the capacitive elements are electrically connected together by a plurality of third common voltage lines disposed in columns; the plurality of first regions electrically separated from the plurality of second regions in the display region in a touch sensing mode of operation; wherein capacitive elements within each region are configured to provide a display function in a display mode of operation of the touch screen and to provide capacitive coupling between at least one region of the plurality of first regions serving as a drive region, and one region of the plurality of second regions serving as a sense region in the touch sensing mode of operation; a drive circuit configured to provide stimulation signals to the plurality of first regions during the touch mode of operation; and a sense channel connected to the plurality of second regions during the touch sensing mode of operation. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A touch screen including display pixels with capacitive elements, the touch screen comprising:
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a plurality of drive regions of display pixels that is stimulated by stimulation signals; a plurality of sense regions of display pixels that receives sense signals corresponding to the stimulation signals; and at least one grounded region of display pixels that is grounded, wherein the at least one ground region is disposed in between at least one of the plurality of sense regions and one of the plurality of drive regions; capacitive elements of the plurality of drive regions electrically connected together by a grid of portions of first voltage lines disposed in a first direction, the portions of the first voltage lines being electrically separate in the first direction in the display region, and portions of second voltage lines disposed in a second direction, the portions of the second voltage lines being electrically separate in the second direction in the display region; capacitive elements of the plurality of sense regions electrically connected together by third voltage lines disposed in the second direction; the plurality of drive regions electrically separated from the plurality of sense regions during a touch sensing mode of operation; capacitive elements within each region are configured to provide a display function in a display mode of operating of the touch screen and to provide capacitive coupling between the drive regions and the sense regions in the touch sensing mode of operation of the touch screen. - View Dependent Claims (28)
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Specification