Touch screen liquid crystal display
First Claim
1. A touch screen display having a plurality of display pixels, the touch screen display comprising:
- a display having a plurality of pixel electrodes and a counter electrode;
the counter electrode segmented into a plurality of touch drive electrodes, the counter electrode operating as a common voltage electrode during a display function and operating as the plurality of touch drive electrodes during a touch function;
a plurality of touch sense electrodes spaced apart from the plurality of touch drive electrodes and disposed transverse to the plurality of touch drive electrodes to form capacitance sensing nodes at each crossing of the plurality of touch drive electrodes and the plurality of touch sense electrodes resulting from mutual capacitive coupling between the crossing plurality of touch drive electrodes and plurality of touch sense electrodes;
at least one capacitance touch sensing circuit operatively coupled to the plurality of touch sense electrodes during the touch function for measuring a change in capacitance at the capacitance sensing nodeswherein each of a plurality of storage capacitors corresponding to a plurality of display pixels is configured to receive a common voltage during the display function.
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Accused Products
Abstract
Disclosed herein are liquid-crystal display (LCD) touch screens that integrate the touch sensing elements with the display circuitry. The integration may take a variety of forms. Touch sensing elements can be completely implemented within the LCD stackup but outside the not between the color filter plate and the array plate. Alternatively, some touch sensing elements can be between the color filter and array plates with other touch sensing elements not between the plates. In another alternative, all touch sensing elements can be between the color filter and array plates. The latter alternative can include both conventional and in-plane-switching (IPS) LCDs. In some forms, one or more display structures can also have a touch sensing function. Techniques for manufacturing and operating such displays, as well as various devices embodying such displays are also disclosed.
675 Citations
28 Claims
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1. A touch screen display having a plurality of display pixels, the touch screen display comprising:
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a display having a plurality of pixel electrodes and a counter electrode; the counter electrode segmented into a plurality of touch drive electrodes, the counter electrode operating as a common voltage electrode during a display function and operating as the plurality of touch drive electrodes during a touch function; a plurality of touch sense electrodes spaced apart from the plurality of touch drive electrodes and disposed transverse to the plurality of touch drive electrodes to form capacitance sensing nodes at each crossing of the plurality of touch drive electrodes and the plurality of touch sense electrodes resulting from mutual capacitive coupling between the crossing plurality of touch drive electrodes and plurality of touch sense electrodes; at least one capacitance touch sensing circuit operatively coupled to the plurality of touch sense electrodes during the touch function for measuring a change in capacitance at the capacitance sensing nodes wherein each of a plurality of storage capacitors corresponding to a plurality of display pixels is configured to receive a common voltage during the display function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification