Segmented V com
First Claim
1. A touch screen comprising:
- a liquid crystal 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 by providing a common voltage 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 to form capacitive coupling nodes therebetween; and
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 capacitive coupling nodes;
wherein during the touch function, the plurality of touch drive electrodes are operative to transmit at least one stimulation voltage along one or multiple ones of the plurality of touch drive electrodes to the capacitive coupling nodes.
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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.
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Citations
26 Claims
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1. A touch screen comprising:
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a liquid crystal 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 by providing a common voltage 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 to form capacitive coupling nodes therebetween; and 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 capacitive coupling nodes; wherein during the touch function, the plurality of touch drive electrodes are operative to transmit at least one stimulation voltage along one or multiple ones of the plurality of touch drive electrodes to the capacitive coupling nodes. - 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)
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24. A method of integrating the functions of a liquid crystal display and a touch screen comprising:
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providing a counter electrode segmented into a plurality of touch drive electrodes for operating as a common voltage electrode by providing a common voltage during a display function and operating as the plurality of touch drive electrodes during a touch function; and providing a plurality of touch sense electrodes spaced apart from the plurality of touch drive electrodes to form capacitive coupling nodes therebetween, the plurality of touch sense electrodes adapted for coupling to capacitance touch sensing circuitry; wherein during the touch function, the plurality of touch drive electrodes are operative to transmit at least one stimulation voltage along one or multiple ones of the plurality of touch drive electrodes to the capacitive coupling nodes. - View Dependent Claims (25, 26)
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Specification