TOUCH SCREEN LIQUID CRYSTAL DISPLAY
First Claim
1. An electronic device incorporating an in-plane-switching (IPS) liquid crystal display touch screen, the touch screen comprising:
- a first substrate having pairs of electrodes for display pixels of the liquid crystal display;
the pairs of electrodes disposed in an in-plane-switching arrangement;
a second substrate, the second substrate having a color filter plate;
a liquid crystal layer disposed between the first and second substrates; and
a plurality of sense lines disposed between the first substrate and the pairs of electrodes;
in a display mode of operation, the pairs of electrodes operative as pixel electrodes and common electrodes, the pixel electrodes connected to receive display data and the common electrodes connected to receive a Vcom modulation voltage; and
in a touch sensing mode of operation, the common electrodes connected to receive a stimulation signal and the plurality of sense lines connected to capacitive sensing circuitry.
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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.
107 Citations
45 Claims
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1. An electronic device incorporating an in-plane-switching (IPS) liquid crystal display touch screen, the touch screen comprising:
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a first substrate having pairs of electrodes for display pixels of the liquid crystal display; the pairs of electrodes disposed in an in-plane-switching arrangement; a second substrate, the second substrate having a color filter plate; a liquid crystal layer disposed between the first and second substrates; and a plurality of sense lines disposed between the first substrate and the pairs of electrodes; in a display mode of operation, the pairs of electrodes operative as pixel electrodes and common electrodes, the pixel electrodes connected to receive display data and the common electrodes connected to receive a Vcom modulation voltage; and in a touch sensing mode of operation, the common electrodes connected to receive a stimulation signal and the plurality of sense lines connected to capacitive sensing circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A mobile telephone incorporating an in-plane-switching (IPS) liquid crystal display touch screen, the touch screen comprising:
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a first substrate, the first substrate having pairs of electrodes for display pixels of the liquid crystal display; the pairs of electrodes disposed in an in-plane-switching arrangement; a second substrate having a color filter plate; a liquid crystal layer disposed between the first and second substrates; and a plurality of sense lines disposed between the first substrate and the pairs of electrodes; in a display mode of operation, the pairs of electrodes operative as pixel electrodes and common electrodes, the pixel electrodes connected to receive display data and the common electrodes connected to receive a common voltage modulation voltage; and in a touch sensing mode of operation, the common electrodes connected to receive a stimulation signal and the plurality of sense lines connected to capacitive sensing circuitry. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A touch screen comprising an in-plane-switching (IPS) liquid crystal display with integral touch sensing, the touch screen comprising:
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a first substrate having pairs of electrodes for display pixels of the liquid crystal display; the pairs of electrodes disposed in an in-plane-switching arrangement; a second substrate having a color filter plate; a liquid crystal layer disposed between the first and second substrates; and a plurality of sense lines disposed between the first substrate and the pairs of electrodes; in a display mode of operation, the pairs of electrodes operative as pixel electrodes and common electrodes, the pixel electrodes connected to receive display data and the common electrodes connected to receive a common voltage modulation voltage; and in a touch sensing mode of operation, the common electrodes connected to receive a stimulation signal and the plurality of sense lines connected to capacitive sensing circuitry. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification