Touch screen liquid crystal display
First Claim
1. An integrated device including a liquid crystal display and a touch screen, comprising:
- a first polarizer;
a second polarizer;
a first substrate having select line circuitry formed thereon, the first substrate being disposed between the first polarizer and the second polarizer;
a second substrate disposed between the first polarizer and the second polarizer;
a liquid crystal layer disposed between the first and second substrates;
a plurality of touch drive electrodes formed on the first substrate;
a plurality of touch sense electrodes disposed between the first and second substrates and operative as a touch sensor during a touch mode of operation, the plurality of touch sense electrodes are spaced apart from the plurality of touch drive electrodes to form capacitive coupling nodes;
a counter electrode segmented to form the plurality of touch sense electrodes, the counter electrode operating as a common voltage electrode by providing a common voltage during a display mode of operations and operating as the plurality of touch sense electrodes during the touch mode of operation;
at least one capacitance touch sensing circuit coupled to the plurality of touch sense electrodes during the touch mode of operation for measuring a change in capacitance at the capacitive coupling nodes via the plurality of touch sense electrodes; and
the touch drive electrodes coupled to the select line circuitry formed on the first substrate;
wherein during the touch mode of operation, 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.
598 Citations
10 Claims
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1. An integrated device including a liquid crystal display and a touch screen, comprising:
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a first polarizer; a second polarizer; a first substrate having select line circuitry formed thereon, the first substrate being disposed between the first polarizer and the second polarizer; a second substrate disposed between the first polarizer and the second polarizer; a liquid crystal layer disposed between the first and second substrates; a plurality of touch drive electrodes formed on the first substrate; a plurality of touch sense electrodes disposed between the first and second substrates and operative as a touch sensor during a touch mode of operation, the plurality of touch sense electrodes are spaced apart from the plurality of touch drive electrodes to form capacitive coupling nodes; a counter electrode segmented to form the plurality of touch sense electrodes, the counter electrode operating as a common voltage electrode by providing a common voltage during a display mode of operations and operating as the plurality of touch sense electrodes during the touch mode of operation; at least one capacitance touch sensing circuit coupled to the plurality of touch sense electrodes during the touch mode of operation for measuring a change in capacitance at the capacitive coupling nodes via the plurality of touch sense electrodes; and the touch drive electrodes coupled to the select line circuitry formed on the first substrate; wherein during the touch mode of operation, 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)
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Specification