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;
a liquid crystal layer disposed between the TFT substrate and the color filter layer;
each drive line including groups of the plurality display pixels connected to a transparent continuous layer of conductive material serving as a common electrode for the drive line and the groups of the plurality of display pixels;
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 form 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
22 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; a liquid crystal layer disposed between the TFT substrate and the color filter layer; each drive line including groups of the plurality display pixels connected to a transparent continuous layer of conductive material serving as a common electrode for the drive line and the groups of the plurality of display pixels; 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 form 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 layer; 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 a continuous layer of transparent conductive material serving as a common electrode for the drive line; a pixel material disposed between the plurality of drive lines and the color filter layer, the pixel material; 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; 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 layer; and touch sensing circuitry connected to receive the sense signals from the plurality of sense lines. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. 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 group including a transparent continuous layer of conductive material serving as a common electrode for the group, the common electrode 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; a pixel material disposed between the first and second substrates; and a plurality of sense lines disposed between the second substrate and the pixel material. - View Dependent Claims (19, 20, 21, 22)
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Specification