INTEGRATED TOUCH SCREENS
First Claim
1. A touch screen including a plurality of display pixels, the touch screen comprising:
- a color filter layer;
a thin film transistor (TFT) layer including a plurality of drive lines;
a liquid crystal layer disposed between the TFT layer and the color filter layer; and
a plurality of sense lines disposed between liquid crystal layer and the color filter layer.
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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
28 Claims
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1. A 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) layer including a plurality of drive lines; a liquid crystal layer disposed between the TFT layer and the color filter layer; and a plurality of sense lines disposed between liquid crystal layer and the color filter layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A 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; a pixel material disposed between the plurality of drive lines and the color filter layer, the pixel material including one of a light modifying material and a light generating 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; 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 layer. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of operating an integrated touch screen including a plurality of circuit elements, the method comprising:
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operating a first group of the circuit elements as display circuitry in a first display operation that displays an image on the touch screen; and operating a second group of the circuit elements as touch sensing circuitry in a first touch sensing operation that senses a touch on or near the touch screen, wherein operating the first group in the first display operation occurs concurrently with operating the second group in the first touch sensing operation. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A touch screen including a plurality of display pixels, the touch screen comprising:
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a first substrate having a plurality display pixels disposed thereon, each display pixel having 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; the plurality of display pixels having common electrodes for receiving a common voltage during the display mode of operation and a stimulation voltage during a 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 directly or indirectly on the second substrate on a side thereof facing the first substrate. - View Dependent Claims (27, 28)
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Specification