Liquid crystal display device having touch sensor embedded therein, method for driving the same, and method for fabricating the same
First Claim
1. A liquid crystal display device having touch sensors embedded therein, comprising:
- a liquid crystal layer interposed between upper and lower substrates;
a plurality of pixels, respectively formed in pixel regions of the lower substrate, each of the plurality of pixels including a pixel electrode and a common electrode applying a horizontal electric field to the liquid crystal layer, a pixel thin film transistor connected with a gate line and a data line to drive the pixel electrode, and a common thin film transistor connected with the gate line and a common line to drive the common electrode;
touch sensors, each forming a sensing capacitor between an object touching the upper substrate and the common electrode to sense touch and then to output a sensing signal;
readout lines to supply sensing driving voltage to the touch sensors and to output the sensing signal from the respective touch sensors; and
sensor gate lines formed in parallel with gate lines, wherein each of the touch sensors includes;
the common electrode formed in plural pixels; and
a sensor thin film transistor to charge the common electrode with the sensing driving voltage from the corresponding readout line and then to output the sensing signal from the common electrode to the corresponding readout line in response to control of the corresponding sensor gate line.
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Abstract
Disclosed is a liquid crystal display device having touch sensors embedded therein. The liquid crystal display device includes a liquid crystal layer interposed between upper and lower substrates, pixels, each of which includes pixel and common electrodes applying a horizontal electric field to the liquid crystal layer, a pixel thin film transistor to drive the pixel electrode, and a common thin film transistor to drive the common electrode, touch sensors, each of which forms a sensing capacitor between an object and the common electrode, sensor power lines, readout lines, and sensor gate lines. Each touch sensor includes the common electrode, a first sensor thin film transistor charging the common electrode with the sensing driving voltage in response to control of the previous sensor gate line, and a second sensor thin film transistor outputting the sensing signal to the readout line in response to control of the current sensor gate line.
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Citations
18 Claims
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1. A liquid crystal display device having touch sensors embedded therein, comprising:
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a liquid crystal layer interposed between upper and lower substrates; a plurality of pixels, respectively formed in pixel regions of the lower substrate, each of the plurality of pixels including a pixel electrode and a common electrode applying a horizontal electric field to the liquid crystal layer, a pixel thin film transistor connected with a gate line and a data line to drive the pixel electrode, and a common thin film transistor connected with the gate line and a common line to drive the common electrode; touch sensors, each forming a sensing capacitor between an object touching the upper substrate and the common electrode to sense touch and then to output a sensing signal; readout lines to supply sensing driving voltage to the touch sensors and to output the sensing signal from the respective touch sensors; and sensor gate lines formed in parallel with gate lines, wherein each of the touch sensors includes; the common electrode formed in plural pixels; and a sensor thin film transistor to charge the common electrode with the sensing driving voltage from the corresponding readout line and then to output the sensing signal from the common electrode to the corresponding readout line in response to control of the corresponding sensor gate line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for driving a liquid crystal display device having touch sensors embedded therein, comprising:
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storing data in a plurality of pixels by driving gate lines and data lines, and applying horizontal electric fields based on the data to a liquid crystal layer using a pixel electrode and a common electrode of each pixel, during a data recording period, wherein the pixel electrode is driven by a pixel thin film transistor, the common electrode is driven by a common thin film transistor, the pixel thin film transistor and the common thin film transistor connect to the same gate line; and sensing touch through a touch sensor using a sensing capacitor formed between an object touching an upper substrate of the liquid crystal display device and the common electrode by driving the common electrode formed in the unit of plural pixels, during a touch sensing period, wherein the touch sensing through the touch sensor includes; allowing a sensor thin film transistor of the touch sensor to supply sensing driving voltage from a readout line to the common electrode of the touch sensor in response to a first gate pulse supplied to a sensor gate line; and allowing the sensor thin film transistor to output a sensing signal generated from the common electrode by the touch sensing to the readout line in response to a second gate pulse supplied to the sensor gate line. - View Dependent Claims (17, 18)
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Specification