Integrated touch screens
First Claim
1. A capacitive touch screen including a plurality of display pixels, the touch screen comprising:
- a color filter layer;
a thin film transistor (TFT) substrate including a plurality of drive lines, wherein the drive lines are configured to transmit a stimulation signal, the stimulation signal used to stimulate the capacitive touch screen for the purpose of detecting touch input events in a touch sensing operation;
a liquid crystal layer disposed between the TFT substrate and the color filter layer;
each drive line including plural Vcom drive rows each Vcom drive row including groups of the plurality display pixels, each display pixel having a TFT including a gate and a common electrode;
the gate of the TFT controlling the TFT to operate in a display operation and in the touch sensing operation;
an integrated gate driver coupled to the gates of the TFTs in each Vcom drive row for operating the Vcom drive rows to display an image on the capacitive touch screen;
a Vcom driver connected to each of the plural Vcom drive row within each drive line for providing the stimulation signal on each individual Vcom drive row within each drive line; and
a plurality of sense lines disposed between liquid crystal layer and the color filter layer, wherein the sense lines are configured to receive signal based on the stimulation signals transmitted by the drive lines and wherein the drive lines and the sense lines forming a plurality of capacitive sensing nodes.
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Accused Products
Abstract
Integrated touch screens are provided including drive lines formed of grouped-together circuit elements of a thin film transistor layer and sense lines formed between a color filter layer and a material layer that modifies or generates light. The common electrodes (Vcom) in the TFT layer can be grouped together during a touch sensing operation to form drive lines. Sense lines can be formed on an underside of a color filter glass, and a liquid crystal region can be disposed between the color filter glass and the TFT layer. Placing the sense lines on the underside of the color filter glass, i.e., within the display pixel cell, can provide a benefit of allowing the color filter glass to be thinned after the pixel cells have been assembled, for example.
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Citations
21 Claims
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1. A capacitive touch screen including a plurality of display pixels, the touch screen comprising:
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a color filter layer; a thin film transistor (TFT) substrate including a plurality of drive lines, wherein the drive lines are configured to transmit a stimulation signal, the stimulation signal used to stimulate the capacitive touch screen for the purpose of detecting touch input events in a touch sensing operation; a liquid crystal layer disposed between the TFT substrate and the color filter layer; each drive line including plural Vcom drive rows each Vcom drive row including groups of the plurality display pixels, each display pixel having a TFT including a gate and a common electrode; the gate of the TFT controlling the TFT to operate in a display operation and in the touch sensing operation; an integrated gate driver coupled to the gates of the TFTs in each Vcom drive row for operating the Vcom drive rows to display an image on the capacitive touch screen; a Vcom driver connected to each of the plural Vcom drive row within each drive line for providing the stimulation signal on each individual Vcom drive row within each drive line; and a plurality of sense lines disposed between liquid crystal layer and the color filter layer, wherein the sense lines are configured to receive signal based on the stimulation signals transmitted by the drive lines and wherein the drive lines and the sense lines forming a plurality of capacitive sensing nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A capacitive touch screen including a plurality of display pixels, the touch screen comprising:
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a color filter substrate; a plurality of drive lines that carry, during a touch sensing operation, stimulation signals that are used to stimulate the touch screen for the purpose of detecting touch and proximity events, each of the plurality of drive lines including groups of the plurality display pixels, each display pixel having a TFT including a gate and a common electrode; a pixel material disposed between the plurality of drive lines and the color filter substrate; display circuitry that controls, during a display operation, the pixel material of each display pixel such that a controlled amount of light from each display pixel passes through the color filter to form an image; the gate of the TFT controlling the TFT to operate in a display operation and in the touch sensing operation; an integrated gate driver coupled to the gates of the TFTs in each Vcom drive row for operating the Vcom drive rows to display an image on the capacitive touch screen; a Vcom driver connected to each of the plural Vcom drive row within each drive line for providing the stimulation signal on each individual Vcom drive row within each drive line; and a plurality of sense lines that receive sense signals based on the stimulation signals, the sense lines being disposed between the pixel material and the color filter substrate; and touch sensing circuitry connected to receive the sense signals from the plurality of sense lines; and wherein the color filter substrate includes a plurality of individual color filters, and the sense lines include conductive material disposed between individual color filters. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A touch screen including a plurality of display pixels, the touch screen comprising:
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a first substrate including a plurality display pixels disposed thereon, each display pixel including a pixel electrode and a switching element for connecting a data line to the pixel electrode to display an image on the touch screen during a display mode of operation, and for disconnecting the data line from the pixel electrode during a touch sensing mode of operation; a plurality of groups of the display pixels, each display pixel within each group including a TFT having a gate and a transparent common electrode, the common electrodes receiving a common voltage during the display mode of operation and a stimulation voltage during the touch sensing mode of operation; a second substrate including a color filter layer having individual color filters; a pixel material disposed between the first and second substrates; and the gate of the TFT controlling the TFT to operate in a display operation and in the touch sensing operation; an integrated gate driver coupled to the gates of the TFTs in each Vcom drive row for operating the Vcom drive rows to display an image on the capacitive touch screen; a Vcom driver connected to each of the plural Vcom drive row within each drive line for providing the stimulation signal on each individual Vcom drive row within each drive line; and a plurality of sense lines disposed on the second substrate and positioned between the individual color filters. - View Dependent Claims (18, 19, 20, 21)
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Specification