Flexible printed circuit for connecting touch screen and liquid crystal display device using the same
Discussed is a Flexible Printed Circuit (FPC). The FPC includes a plurality of touch lines respectively connected to a plurality of touch electrode lines, a first film adhered to the touch lines, a second film overlapping the first film at an upper end surface of the first film and covering the touch lines, and a feedback compensation signal electrode adhered to a lower end surface of the first film, and receiving a feedback compensation signal for removing noise.
1. A Flexible Printed Circuit (FPC) for connecting a touch screen, comprising:
a plurality of touch lines respectively connected to a plurality of touch electrode lines;
a first film adhered to the touch lines;
a second film overlapping the first film at an upper end surface of the first film and covering the touch lines; and
a feedback compensation signal electrode adhered to a lower end surface of the first film, and receiving a feedback compensation signal for removing noise,
wherein the feedback compensation signal electrode is provided as a plurality of lines disposed under and respectively corresponding to the touch lines in a one-to-one manner, and
wherein the feedback compensation signal electrode receives the feedback compensation signal that inverts a feedback common voltage from a display panel.
2. The FPC of claim 1 , wherein,
a plurality of touch line pads respectively connected to a plurality of touch line pins of a touch board connector are disposed at respective distal ends of the touch lines, and
a feedback compensation signal electrode pad connected to a feedback compensation signal electrode pin of the touch board connector is disposed at a distal end of the feedback compensation signal electrode.
3. The FPC of claim 2 , wherein,
the touch lines are respectively connected to a plurality of driving electrode lines receiving a noise driving signal having noise among the touch electrode lines, and
the touch line pads are respectively connected to a plurality of touch line pins connected to a touch driver of a touch IC among a plurality of pins arranged in the touch board connector.
4. The FPC of claim 2 , wherein,
the touch lines are respectively connected to a plurality of receiving electrode lines receiving a noise sensing signal having noise among the touch electrode lines, and
the touch line pads are respectively connected to a plurality of touch line pins connected to a touch sensing unit of a touch IC among a plurality of pins arranged in the touch board connector.
5. A Liquid Crystal Display (LCD) device, comprising:
a panel, a plurality of data lines and a plurality of gate line being arranged in the panel;
a touch screen comprising a plurality of touch electrodes for sensing a touch;
a plurality of touch electrode lines respectively connected to the touch electrodes;
a touch IC determining whether the touch electrodes are touched using a sensing signal generated by a driving signal applied to the touch electrodes;
a touch board connector mounted on the touch board with the touch IC mounted thereon, and connected to the touch IC;
a Flexible Printed Circuit (FPC) connecting the touch electrode lines to the touch board connector;
a common voltage generator supplying a common voltage to a plurality of common electrodes disposed in the panel; and
a compensation signal generator inverting a noise signal fed back from a feedback common voltage from the panel to generate a feedback compensation signal, and transferring the feedback compensation signal to the touch board connector,
wherein a feedback compensation signal electrode receiving the feedback compensation signal through the touch board connector and a plurality of touch lines respectively connected to the plurality of the touch electrode lines are disposed in the FPC,
the touch lines are adhered to an upper end surface of a first film and the feedback compensation signal electrode is adhered to a lower end surface of the first film, and
the feedback compensation signal electrode is provided as a plurality of lines disposed under and respectively corresponding to the touch lines in a one-to-one manner, and
wherein the feedback compensation signal electrode receives the inverted noise signal fed back from the panel.
6. The LCD device of claim 5 , wherein,
the noise signal is a feedback common voltage which is applied from the common voltage generator to the panel and fed back from the panel with noise being added into the feedback common voltage, and
the feedback compensation signal is generated by inverting the feedback common voltage.
7. The LCD device of claim 5 , wherein,
the FPC is a driver FPC that transfers a driving signal applied to the touch screen, or
the FPC is a sensor FPC that applies a sensing signal, applied from the touch screen, to the touch IC.
8. The LCD device of claim 5 , wherein,
the touch screen is a capacitive touch screen using a mutual type, or
the touch screen is a capacitive touch screen using a self-cap type.
9. The LCD device of claim 5 , wherein,
the touch screen and the panel are provided as one body, or
the touch screen is adhered to an upper glass substrate configuring the panel.