Patent Publication Number: US-11662845-B2

Title: Touch screen panel and display device having the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 16/825,971, filed Mar. 20, 2020, which is a continuation of U.S. patent application Ser. No. 14/806,010, filed Jul. 22, 2015, now U.S. Pat. No. 10,606,397, which claims priority to and the benefit of Korean Patent Application No. 10-2014-0136864, filed Oct. 10, 2014, the entire content of all of which is incorporated herein by reference. 
    
    
     BACKGROUND 
     Field 
     The present disclosure generally relates to a touch screen panel and a display device having the same. 
     Description of the Related Technology 
     Display devices are used in a variety of multimedia devices, such as television sets, mobile phones, tablet computers, navigation systems, game consoles, etc. Traditionally, peripheral devices, such as a keyboard or a mouse, have been used as the input devices for such displays. 
     Touch screen panels have been developed as an input for displays and are formed directly on the display. Touch screen panels can be classified into add-on, touch-on-cover glass, and touch-on-display types. Touch-on-display type touch screen panels can further be classified into in-cell and on-cell types. 
     SUMMARY OF CERTAIN INVENTIVE ASPECTS 
     One inventive aspect is a touch screen panel that can reduce the influence of driving noise to prevent reductions in touch sensitivity. 
     Another aspect is a display device having the touch screen panel. 
     Another aspect is a display device including a display panel and a touch screen panel. The display device further includes an electrostatic discharge line. The display panel displays an image and the touch screen panel is formed on the display panel. 
     The touch screen panel includes a noise shielding layer, a plurality of first touch sensors, a plurality of second touch sensors, a first pad part, and a first line part. The noise shielding layer and the first touch sensors are formed on a base layer. The first pad part is insulated from and overlaps the noise shielding layer and includes a plurality of signal pads. The first line part includes a plurality of touch signal lines to connect a corresponding signal pad of the signal pads and a corresponding touch sensor of the first and second touch sensors. 
     The touch screen panel further includes an insulating layer. The insulating layer is interposed between the first touch sensors and the second touch sensors and between the noise shielding layer and the first pad part. 
     The first pad part further includes a first auxiliary pad electrically connected to the noise shielding layer through a contact hole formed through the insulating layer. The first auxiliary pad is provided in a plural number and applied with a constant direct current voltage. 
     Each of the first touch sensors includes a plurality of first sensing parts arranged in a first direction and first connection parts each connecting two first sensing parts adjacent to each other among the first sensing parts. Each of the second touch sensors includes a plurality of second sensing parts arranged in a second direction crossing the first direction and second connection parts each connecting two second sensing parts adjacent to each other among the second sensing parts. 
     The display panel is an organic light-emitting diode (OLED) display panel configured to include a base substrate, a wire layer, a device layer, and a sealing layer. The wire layer is formed on the base substrate. The wire layer includes a plurality of driving lines electrically connected to the device layer, a second line part including a plurality of display signal lines connected to the driving lines, and a second pad part including a plurality of pads connected to the display signal lines. The device layer is formed on the wire layer and the sealing layer covers the device layer and provides the base layer. The touch screen panel further includes a base substrate and the base substrate provides the base layer. 
     The noise shielding layer of the touch screen panel overlaps the second line part of the display panel or a second pad part. 
     The touch screen panel further includes the electrostatic discharge line applied with a constant direct current voltage. The base layer includes a sensing area in which the first and second touch sensors are formed and a non-sensing area, in which the electrostatic discharge line is formed, surrounding the sensing area, and the sensing area and the non-sensing area are defined on an upper surface of the base layer. 
     In the touch screen panel, the first auxiliary pad is provided in a plural number. One end of the electrostatic discharge line is connected to one first auxiliary pad of the first auxiliary pads, and the other end of the electrostatic discharge line is connected to the other first auxiliary pad of the first auxiliary pads. 
     The first pad part further includes a plurality of second auxiliary pads to apply the direct current voltage to the electrostatic discharge line. One end of the electrostatic discharge line is connected to one second auxiliary pad of the second auxiliary pads, and the other end of the electrostatic discharge line is connected to the other second auxiliary pad of the second auxiliary pads. 
     Another aspect is a touch screen panel comprising a base layer; a noise shielding layer formed over the base layer; a plurality of first touch sensors formed over the base layer; a plurality of second touch sensors formed over the base layer and electrically insulated from the first touch sensors, wherein the second touch sensors cross the first touch sensors; a first pad area electrically insulated from and overlapping the noise shielding layer, wherein the first pad area comprises a plurality of signal pads; and a plurality of touch signal lines respectively electrically connecting the signal pads to the first and second touch sensors. 
     In exemplary embodiments, the touch screen panel further comprises an insulating layer interposed: i) between the first touch sensors and the second touch sensors and ii) between the noise shielding layer and the first pad part. The first pad area can further comprise at least one first auxiliary pad electrically connected to the noise shielding layer via a contact hole formed in the insulating layer. The first auxiliary pad can be configured to receive a constant direct current (DC) voltage. Each of the first touch sensors can comprise: i) a plurality of first electrodes arranged in a first direction and ii) a plurality of first connectors each connecting two of the first electrodes, each of the second touch sensors can comprise i) a plurality of second electrodes arranged in a second direction crossing the first direction and ii) a plurality of second connectors each connecting two of the second electrodes, and the first and second electrodes can have a mesh structure. 
     In exemplary embodiments, the touch screen panel is formed on an organic light-emitting diode (OLED) display panel, wherein the OLED display panel comprises a sealing layer, and wherein the base layer is the sealing layer of the OLED display. The base layer can be a base substrate. The touch screen panel can further comprise an electrostatic discharge line configured to receive a constant direct current (DC) voltage, wherein the base layer comprises a sensing area in which the first and second touch sensors are arranged and a non-sensing area in which the electrostatic discharge line is formed, wherein the non-sensing area surrounds the sensing area. The at least one first auxiliary pad can comprise a plurality of first auxiliary pads, one end of the electrostatic discharge line can be electrically connected to one of the first auxiliary pads, and the other end of the electrostatic discharge line can be electrically connected to another of the first auxiliary pads. 
     In exemplary embodiments, the first pad area further comprises a plurality of second auxiliary pads configured to apply the DC voltage to the electrostatic discharge line, wherein one end of the electrostatic discharge line is electrically connected to one of the second auxiliary pads, and wherein the other end of the electrostatic discharge line is electrically connected to another of the second auxiliary pads. 
     Another aspect is a display device comprising a display panel configured to display an image; and a touch screen panel formed over the display panel, wherein the touch screen panel comprises: a noise shielding layer formed over the display panel; a plurality of first touch sensors formed over the display panel; a plurality of second touch sensors formed over the display panel and electrically insulated from the first touch sensors, wherein the second touch sensors cross the first touch sensors; a first pad area electrically insulated from and overlapping the noise shielding layer, wherein the first pad area comprises a plurality of signal pads; and a plurality of touch signal lines respectively electrically connecting the signal pads to the first and second touch sensors. 
     In exemplary embodiments, the touch screen panel further comprises an insulating layer interposed: i) between the first touch sensors and the second touch sensors and ii) between the noise shielding layer and the signal pads. The first pad area can further comprise at least one first auxiliary pad electrically connected to the noise shielding layer via a contact hole formed in the insulating layer. The first auxiliary pad can be configured to receive a constant direct current (DC) voltage. 
     In exemplary embodiments, each of the first touch sensors comprises: i) a plurality of first electrodes arranged in a first direction and a plurality of first connectors each connecting two of the first electrodes, wherein each of the second touch sensors comprises: i) a plurality of second electrodes arranged in a second direction crossing the first direction and ii) a plurality of second connectors each connecting two of the second electrodes, and electrically the first and second electrodes have a mesh structure. 
     In exemplary embodiments, the display panel comprises a base substrate; a wire layer formed over the base substrate; a device layer formed over the wire layer; and a sealing layer covering the device layer, wherein the noise shielding layer and the first touch sensors are directly formed on the sealing layer. 
     In exemplary embodiments, the wire layer comprises a plurality of driving lines electrically connected to the device layer; a plurality of display signal lines electrically connected to the driving lines; and a second pad area comprising a plurality of pads connected to the display signal lines, wherein the noise shielding layer overlaps the display signal lines. 
     In exemplary embodiments, the display device further comprises an electrostatic discharge line configured to receive a constant direct current (DC) voltage, wherein the display panel comprises a sensing area in which the first and second touch sensors are arranged and a non-sensing area in which the electrostatic discharge line is formed, wherein the non-sensing area surrounds the sensing area. 
     In exemplary embodiments, the at least one first auxiliary pad comprise a plurality of first auxiliary pads, wherein one end of the electrostatic discharge line is electrically connected to one of the first auxiliary pads, and wherein the other end of the electrostatic discharge line is electrically connected to another of the first auxiliary pads. 
     In exemplary embodiments, the first pad area further comprises a plurality of second auxiliary pads configured to apply the DC voltage to the electrostatic discharge line, wherein one end of the electrostatic discharge line is electrically connected to one of the second auxiliary pads, and wherein the other end of the electrostatic discharge line is electrically connected to another of the second auxiliary pads. 
     According to at least one embodiment, the noise shielding layer included in the touch screen panel prevents the noise, which is generated from the second line part or the pad part of the display panel, from exerting influence on the first pad part of the touch screen panel. Thus, the touch sensitivity of the touch screen panel may be improved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other advantages of the present disclosure will become readily apparent by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein: 
         FIG.  1    is a perspective view showing a display device according to an exemplary embodiment. 
         FIG.  2    is an exploded perspective view showing a display device according to an exemplary embodiment. 
         FIG.  3    is a cross-sectional view showing a display panel according to an exemplary embodiment. 
         FIG.  4    is a plan view showing a display panel according to an exemplary embodiment. 
         FIG.  5    is a cross-sectional view showing a touch screen panel according to an exemplary embodiment. 
         FIGS.  6 A and  6 B  are views showing a touch screen panel according to an exemplary embodiment. 
         FIG.  6 C  is a view showing a touch sensing part according to an exemplary embodiment. 
         FIG.  7    is a perspective view showing a panel part of a touch screen panel according to an exemplary embodiment. 
         FIGS.  8 A to  8 C  are cross-sectional views showing a pad part of a touch screen panel according to an exemplary embodiment. 
         FIGS.  9  and  10    are views showing a touch screen panel according to exemplary embodiments. 
     
    
    
     DETAILED DESCRIPTION OF CERTAIN INVENTIVE EMBODIMENTS 
     It will be understood that when an element or layer is referred to as being “on”, “connected to” or “coupled to” another element or layer, it can be directly on, connected or coupled to the other element or layer or intervening elements or layers may also be present. In contrast, when an element is referred to as being “directly on,” “directly connected to” or “directly coupled to” another element or layer, there are no intervening elements or layers present. Like numbers refer to like elements throughout. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the described technology. 
     Spatially relative terms, such as “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the described technology. As used herein, the singular forms, “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “includes” and/or “including”, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the described technology belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     Hereinafter, the described technology will be explained in detail with reference to the accompanying drawings. 
       FIG.  1    is a perspective view showing a display device DA according to an exemplary embodiment.  FIG.  2    is an exploded perspective view showing a display device DA according to an exemplary embodiment. 
     A display surface in which an image IM is displayed is substantially parallel to a surface defined by a first direction DR 1  and a second direction DR 2  and a line normal to the display surface is substantially parallel to a third direction DR 3 . The third direction DR 3  is substantially normal to front and rear surfaces of each member of the display device DA. However, the first, second, and third directions DR 1 , DR 2 , and DR 3  should not be limited thereto or thereby. 
       FIG.  1    shows a mobile phone as the display device DA according to an exemplary embodiment. However, the display device DA should not be limited to the mobile phone embodiment. For instance, the display device DA can be applied to a large-sized electronic device, such as a television set, an outdoor billboard, etc., and/or a small or medium-sized electronic device, such as a personal computer, a notebook computer, a personal digital assistant, a navigation unit, a game unit, a mobile electronic device, a wrist-type electronic device, a camera, etc., but the described technology should not be limited thereto or thereby. 
     Referring to  FIG.  1   , the display device DA includes a plurality of areas distinct from each other when viewed in a plan view. The display device DA includes a display area  100 -AR in which the image IM is displayed and a non-display area  100 -BR arranged adjacent to the display area  100 -AR. As a representative example,  FIG.  1    shows an internet search bar as the image IM. In the  FIG.  1    embodiment, the display area  100 -AR has a substantially quadrangular shape and the non-display area  100 -BR surrounds the display area  100 -AR. That is, the non-display area  100 -BR corresponds to an edge of the non-display area  100 -BR. 
     Referring to  FIGS.  1  and  2   , the display device DA includes a window member or window  100 , a lower frame  200 , a display panel  300 , and a touch screen panel  400 . Each of the window member  100 , the display panel  300 , and the touch screen panel  400  includes areas respectively corresponding to the display area  100 -AR and the non-display area  100 -BR of the display device DA. 
     The window member  100  includes a display area  100 -AR configured to transmit the image IM displayed in the display panel  300  and a non-display area  100 -BR arranged adjacent to the display area  100 -AR. The window member  100  may be formed of glass, sapphire, or plastic. 
     The lower frame  200  is connected to the window member  100  to accommodate the display panel  300  and the touch screen panel  400 . The lower frame  200  is manufactured by assembling a plurality of parts or is integrally formed in a single unitary and individual unit by, for example, an injection molding method. The lower frame  200  may include a plastic or metal material. In the present exemplary embodiment, the lower frame  200  can be omitted from the display device DA. 
     The display panel  300  includes a front surface  300 -FS, a side surface  300 -SS, and a rear surface (not shown). The front surface  300 -FS of the display panel  300  includes a display area (not shown) and a non-display area (not shown). The display area  100 -AR of the display panel  300  displays the image IM. The display panel  300  includes a base substrate, a wire layer, a device layer, and a sealing layer. 
     The touch screen panel  400  includes a first conductive layer  400 -CL 1 , a second conductive layer  400 -CL 2 , an insulating layer  400 -IL, and an upper base member  400 -UBS. The touch screen panel  400  includes a sensing area  400 -AR overlapping the display area  100 -AR of the window member  100  and a non-sensing area  400 -BR overlapping the non-display area  100 -BR of the window member  100 . 
     A pad part or pad area  400 -PD (hereinafter, referred to as a first pad part) of the touch screen panel  400 , to which driving signals are applied, is arranged at one side of the non-sensing area  400 -BR. In the  FIG.  1    embodiment, the first pad part  400 -PD is does not overlap a pad part or pad area  300 -PD (hereinafter, referred to as a second pad part) of the display panel  300 . 
     Hereinafter, configuration of the window member  100 , the lower frame  200 , the display panel  300 , and the touch screen panel  400  will be described with reference to  FIG.  2   . 
     Referring to  FIG.  2   , the touch screen panel  400  and the window member  100  are arranged on the front surface  300 -FS of the display panel  300 . A black matrix (not shown) may be arranged on a rear surface of the window member  100  to define the non-display area  100 -BR of the window member  100 . The black matrix (not shown) is formed by coating a colored organic layer on the window member  100 . 
     An optically clear adhesive film (OCA) can be arranged between the touch screen panel  400  and the window member  100 . The touch screen panel  400  is attached to the window member  100  by the OCA. The touch screen panel  400  is arranged on the front surface  300 -FS of the display panel  300 . 
     The lower frame  200  is connected to the window member  100 . The lower frame  200  covers the rear surface of the display panel  300 . An adhesive member (not shown) is interposed between the rear surface of the display panel  300  and the lower frame  200 . The lower frame  200  is attached to the rear surface of the display panel  300  by the adhesive member (not shown). 
       FIG.  3    is a cross-sectional view showing a display panel according to an exemplary embodiment.  FIG.  4    is a plan view showing a display panel according to an exemplary embodiment. 
     Referring to  FIG.  3   , the display panel  300  includes the base substrate  300 -BS, the wire layer  300 -WL, the device layer  300 -EL, and the sealing layer  300 -CL. The wire layer  300 -WL is formed on the base substrate  300 -BS and the device layer  300 -EL is formed on the wire layer  300 -WL. The sealing layer  300 -CL covers the device layer  300 -EL. The base substrate  300 -BS includes at least one of polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether sulfone (PES), and fiber reinforced plastic (FRP). The display panel  300  may further include a protective film (not shown) formed on a rear surface of the base substrate  300 -BS. In addition, the display panel  300  may further include a polarizing plate (not shown) formed on the sealing layer  300 -CL. 
     Referring to  FIG.  4   , the device layer  300 -EL (refer to  FIG.  3   ) of the display panel  300  includes a plurality of pixels PX. The pixels PX overlap the display area  300 -AR. The wire layer  300 -WL (refer to  FIG.  3   ) of the display panel  300  includes a plurality of driving lines SGL- 1 , a plurality of signal lines SGL- 2 , gate pads GL-P connected to the signal lines SGL- 2 , and data pads DL-P. 
     The driving lines SGL- 1  are electrically connected to the device layer  300 -EL. The driving lines SGL- 1  include gate lines GL arranged in the second direction DR 2  and data lines DL arranged in the first direction DR 1 . Each pixel PX is connected to a corresponding gate line of the gate lines GL and a corresponding data line of the data lines DL. In some embodiments, each pixel PX includes an organic light-emitting diode (OLED) and a circuit configured to control the intensity of current applied to the OLED. Each circuit includes at least one thin film transistor and at least one capacitor. The configuration of the pixels can be varied depending on the light-emission technology of the display panel, e.g., the display panel can be one of a liquid crystal display panel, an OLED display panel, an electrophoretic display panel, etc. 
     The data lines DL are respectively connected to the signal lines SGL- 2 . At least one of the signal lines SGL- 2  is connected to a driving circuit DCV. The signal lines SGL- 2  are connected to the gate pads GL-P and the data pads DL-P. 
     The driving circuit DCV connected to the gate lines GL is arranged at one side of the non-display area  300 -BR. The driving circuit DVC applies gate signals to the gate lines GL. The driving circuit DVC receives various signals, e.g., a clock signal, a control signal, etc., from the gate pads GL-P arranged in the non-display area  300 -BR. 
     The non-display area  300 -BR includes the second pad part  300 -PD in which the gate pads GL-P and the data pads DL-P are formed and a peripheral area formed adjacent to the second pad part  300 -PD. The second pad part  300 -PD is connected to a first flexible printed circuit board FPC- 300 . The display panel  300  is connected to a main driving circuit through the first flexible printed circuit board FPC- 300 . The first flexible printed circuit board FPC- 300  is bent along an imaginary line (not shown) substantially parallel to the first direction DR 1  and the main driving circuit is arranged on the rear surface of the lower frame  200  (refer to  FIGS.  1  and  2   ) or the rear surface of the display panel  300 . 
       FIG.  5    is a cross-sectional view showing a touch panel according to an exemplary embodiment.  FIGS.  6 A and  6 B  are views showing a touch panel according to an exemplary embodiment. Hereinafter, the touch screen panel  400  will be described in detail with reference to  FIGS.  5 ,  6 A, and  6 B . 
     Referring to  FIG.  5   , the touch screen panel  400  includes various layers. The touch screen panel  400  includes the first conductive layer  400 -CL 1 , the insulating layer  400 -IL, the second conductive layer  400 -CL 2 , and the upper base member  400 -UBS. 
     The first conductive layer  400 -CL 1  is formed on a base layer. The first conductive layer  400 -CL 1  includes a plurality of electrodes. In the present exemplary embodiment, the base layer is the sealing layer  300 -CL shown in  FIG.  3   . 
     The insulating layer  400 -IL is formed on the first conductive layer  400 -CL 1 . The insulating layer  400 -IL protects the first conductive layer  400 -CL 1  from external pressure and moisture. The insulating layer  400 -IL insulates the first conductive layer  400 -CL 1  from the second conductive layer  400 -CL 2 . 
     The second conductive layer  400 -CL 2  is formed on the insulating layer. 
     The upper base member  400 -UBS is formed on the second conductive layer  400 -CL 2 . 
     Although not shown in  FIG.  5   , the touch screen panel  400  can further include a base substrate. The base substrate serves as the base layer. The electrodes are formed on the base substrate. 
       FIG.  6 A  shows the first conductive layer  400 -CL 1  shown in  FIG.  5   . 
     Referring to  FIG.  6 A , the first conductive layer  400 -CL 1  formed on the base layer includes first touch sensors E 1 , a first signal line part or first signal line LP 1  of a first sensor line part L 1 -L 1  connected to the first touch sensors E 1 , a signal line contact part or signal line contact CP of the first sensor line part L 1 -L 1 , and a noise shielding layer NSL. The first touch sensors E 1  overlap the sensing area  400 -AR. The first signal line part LP 1  overlaps the non-sensing area  400 -BR. 
     The first touch sensors E 1  include first sensing parts or first electrodes P 1  and first connection parts or first connectors C 1 . The first touch sensors E 1  extend in the second direction DR 2  and are arranged in the first direction DR 1 . The first sensing parts P 1  are connected to each other by the first connection parts C 1 . Each first connection part C 1  connects two first sensing parts P 1  adjacent to each other among the first sensing parts P 1 . 
     Each of the first touch sensors E 1  is connected to the first signal line part LP 1 . The first signal line part LP 1  connects the first touch sensors E 1  to the signal line contact part CP of the first sensor line part L 1 -L 1 . 
     The noise shielding layer NSL is arranged to be spaced apart from the signal line contact part CP. 
       FIG.  6 B  shows the second conductive layer  400 -CL 2  shown in  FIG.  2   . 
     Referring to  FIG.  6 B , the second conductive layer  400 -CL 2  formed on the insulating layer  400 -IL includes second touch sensors E 2 , a second signal line part or second signal line LP 2  of the first sensor line part L 1 -L 1 , the first pad part  400 -PD, and a second sensor line part or second sensor line L 1 -L 2  connected to the second touch sensors E 2 . The second touch sensors E 2  overlap the sensing area  400 -AR and the second sensor line part L 1 -L 2  overlaps the non-sensing area  400 -BR. 
     The second touch sensors E 2  include second sensing parts or second electrodes P 2  and second connection parts or second connectors C 2 . The second touch sensors E 2  extend in the first direction DR 1  and are arranged in the second direction DR 2 . The second touch sensors E 2  are electrically insulated from the first touch sensors E 1  while crossing the first touch sensors E 1 . The second sensing parts P 2  are connected to each other by the second connection parts C 2 . Each second connection part C 2  connects two second sensing parts P 2  adjacent to each other among the second sensing parts P 2 . 
     The second touch sensors E 2  are connected to the second sensor line part L 1 -L 2 . The second sensor line part L 1 -L 2  is connected to corresponding touch sensors of the second touch sensors E 2 . The second sensor line part L 1 -L 2  connects the second touch sensors E 2  and signal pads SL-P of the first pad part  400 -PD, which is described later. 
     The second signal line part LP 2  is connected to the signal line contact part CP through a signal contact hole CH 10  formed through the insulating layer  400 -IL. The signal line contact part CP connects the first signal line part LP 1  and the second signal line part LP 2  through the signal contact hole CH 10 . That is, the first signal line part LP 1  is connected to the second signal line part LP 2  by the signal line contact part CP. The first sensor line part L 1 -L 1  connects the first touch sensors E 1  and the signal pads SL-P of the first pad part  400 -PD. 
     The first pad part  400 -PD includes the signal pads SL-P. Each of the signal pads SL-P is connected to corresponding first and second touch sensors E 1  and E 2  through the first and second sensor line parts L 1 -L 1  and L 1 -L 2  of a first line part L 1 -L. The first line part L 1 -L includes a plurality of touch signal lines. 
     The first pad part  400 -PD may further include a first auxiliary pad NS-P. The first auxiliary pad NS-P is electrically connected to the noise shielding layer NSL through a shielding contact hole CH 1 , illustrated in  FIG.  7   . A plurality of first auxiliary pads NS-P may be formed. The first pad part  400 -PD is electrically insulated from and overlaps the noise shielding layer NSL. 
     As shown in  FIGS.  5 ,  6 A, and  6 B , the touch screen panel  400  includes the noise shielding layer NSL, the first touch sensors E 1 , the second touch sensors E 2 , the first pad part  400 -PD, and the first line part L 1 -L. In the illustrated embodiment, noise shielding layer NSL and the first touch sensors E 1  are formed on the sealing layer  300 -CL shown in  FIG.  3   , which serves as the base layer. However, the base layer should not be limited to the sealing layer  300 -CL. The second touch sensors E 2  are formed to cross the first touch sensors E 1  and are electrically insulated from the first touch sensors E 1 . The first pad part  400 -PD includes the signal pads SL-P and overlaps and is electrically insulated from the noise shielding layer NSL. The first line part L 1 -L includes the first and second sensor line parts L 1 -L 1  and L 1 -L 2 . The first sensor line part L 1 -L 1  connects the first touch sensors E 1  and corresponding signal pads SL-P 1 , SL-P 2 , and SL-P 3 . The first sensor line part L 1 -L 1  includes the first signal line part LP 1 , the second signal line part L 2 , and the signal line contact part CP. The second sensor line part L 1 -L 2  connects the second touch sensors E 2  and corresponding signal pads SL-P 4 , SL-P 5 , SL-P 6 , and SL-P 7 . 
     The non-sensing area  400 -BR includes the first pad part  400 -PD in which the signal pads SL-P are formed and the peripheral area arranged adjacent to the first pad part  400 -PD. A second flexible printed circuit board FPC- 400  is connected to the first pad part  400 -PD. The touch screen panel  400  is connected to the main driving circuit through the second flexible printed circuit board FPC- 400 . 
     The first line part L 1 -L is formed in the peripheral area adjacent to the first pad part  400 -PD. A front surface UBS-PP of the upper base member  400 -UBS overlaps the sensing area  400 -AR and the non-sensing area  400 -BR. The upper base member  400 -UBS either overlaps the first pad part  400 -PD or does not overlap the first pad part  400 -PD to avoid overlapping with the second flexible printed circuit board FPC- 400 . 
     In the embodiment of  FIGS.  5 ,  6 A, and  6 B , the touch screen panel  400  can be implemented as a resistive film type or an electromagnetic induction type in addition to the electrostatic capacitive type. Accordingly, the structure of the first and second conductive layers  400 -CL 1  and  400 -CL 2  can be changed. 
       FIG.  6 C  is a view showing the first sensing part P 1  and the first connection part C 1  according to an exemplary embodiment. 
     Referring to  FIG.  6 C , the first touch sensors E 1  are formed to have a mesh structure including a plurality of openings OP. Each opening OP corresponds to at least one pixel PX. Each second touch sensor E 2  has substantially the same shape as that of the first touch sensors E 1 . The first and second touch sensors E 1  and E 2  are formed of a low resistance metal, e.g., silver (Ag), aluminum (Al), copper (Cu), chromium (Cr), nickel (Ni), etc., but they should not be limited thereto or thereby. In some embodiments, since the first touch sensors E 1  having the mesh structure are formed by a low temperature process, the pixel PX can be prevented from burning or damaging. In addition, since each pixel PX is arranged to correspond to a corresponding opening among the openings OP, the visibility of the display device DA can be improved. 
     The shape of the first sensing part P 1  should not be limited thereto or thereby. That is, the first sensing part P 1  can have a polygonal shape, e.g., a quadrangular shape or a diamond shape, which is formed using a transparent electrode, such as indium tin oxide (ITO). 
       FIGS.  7  and  8 A to  8 C  are views showing the connection relation between the first pad part  400 -PD, the noise shielding layer NSL, and the first line part L 1 -L of the touch screen panel  400 .  FIG.  8 A  is a cross-sectional view taken along the first direction DR 1  shown in  FIG.  7   .  FIGS.  8 B and  8 C  are cross-sectional views taken along the second direction DR 2  shown in  FIG.  7   . 
     Referring to  FIGS.  7  and  8 A to  8 C , the first pad part  400 -PD includes the signal pads SL-P 1 , SL-P 2 , SL-P 3 , SL-P 4 , SL-P 5 , SL-P 6 , and SL-P 7  (hereinafter, referred to as SL-P) and the first auxiliary pad NS-P 1  and NS-P 2 . The number of the signal pads SL-P should not be limited to seven. 
     As shown in  FIGS.  7  and  8 A , the first auxiliary pad NS-P 1  and NS-P 2  is electrically connected to the noise shielding layer NSL through the shielding contact holes CH 1  formed in the insulating layer  400 -IL. A constant direct current (DC) voltage is applied to first auxiliary pad NS-P 1  and NS-P 2 . In addition, the constant DC voltage can be directly applied to the noise shielding layer NSL without passing through the first auxiliary pad NS-P 1  and NS-P 2 . The voltage applied to the first auxiliary pad NS-P 1  and NS-P 2  or the noise shielding layer NSL should not be limited to the constant DC voltage. 
     Referring to  FIGS.  7  and  8 B , each of the first to third signal pads SL-P 1  to SL-P 3  is connected to the second signal line part LP 2  of the corresponding first sensor line part L 1 -L 1 . The second signal line part LP 2  is connected to the signal line contact part CP through the signal contact hole CH 10  formed in the insulating layer  400 -IL. The signal line contact part CP connects the first signal line part LP 1  to the second signal line part LP 2  through the signal contact hole CH 10  formed in the insulating layer  400 -IL. The first signal line part LP 1  is formed on the first conductive layer  400 -CL 1  and connected to the first touch sensors E 1  as shown in  FIG.  6 A . 
     Referring to  FIGS.  7  and  8 C , each of the fourth to seventh signal pads SL-P 4  to SL-P 7  is connected to a corresponding second sensor line part L 1 -L 2 . Referring to  FIG.  6 B , the second sensor line part L 1 -L 2  connects the second touch sensors E 2  to the signal pads SL-P 4 , SL-P 5 , SL-P 6 , and SL-P 7  of the first pad part  400 -PD corresponding to the second touch sensors E 2 . 
     Referring to  FIGS.  2  and  4   , a second line part L 2 -L including the signal lines SGL- 2  is formed at a lower portion of the first pad part  400 -PD. The second line part L 2 -L includes a plurality of display signal lines. 
     The influence of noise on the first pad part  400 -PD may be generated in the second line part L 2 -L, and thus the touch sensitivity of the touch screen panel  400  can be reduced. 
     The noise shielding layer NSL is interposed between the first pad part  400 -PD and the second line part L 2 -L. The noise shielding layer NSL has an area greater than that of the first pad part  400 -PD. Accordingly, the noise shielding layer NSL can prevents the noise, which is generated in the second line part L 2 -L, from exerting an influence on the first pad part  400 -PD. Therefore, the touch sensitivity of the touch screen panel  400  can be improved. 
     In addition, the second pad part  300 -PD including the gate pads GL-P and the data pads DL-P can be arranged at the lower portion of the first pad part  400 -PD. The influence of noise on the first pad part  400 -PD by the second pad part  300 -PD and the operation of the noise shielding layer NSL are substantially the same as those when the second line part L 2 -L is formed at the lower portion of the first pad part  400 -PD. 
       FIG.  9    is a view showing the touch screen panel  400  further including an electrostatic discharge line ESD according to an exemplary embodiment. 
     Referring to  FIG.  9   , the touch screen panel  400  includes the sensing area  400 -AR and the non-sensing area  400 -BR surrounding the sensing area  400 -AR. The non-sensing area  400 -BR includes the electrostatic discharge line ESD applied with a constant DC voltage. 
     One end of the electrostatic discharge line ESD is connected to one auxiliary pad NS-P 1  of a plurality of first auxiliary pads and the other end of the electrostatic discharge line ESD is connected to the other auxiliary pad NS-P 2  of the first auxiliary pads. Thus, the noise shielding layer NSL is applied with the constant DC voltage applied to the electrostatic discharge line ESD. When viewed from a different viewpoint, the constant DC voltage applied to the noise shielding layer NSL is applied to the electrostatic discharge line ESD. The voltage applied to the electrostatic discharge line ESD or the noise shielding layer NSL should not be limited to the constant DC voltage. 
       FIG.  10    is a view showing the touch screen panel  400  further including the electrostatic discharge line ESD and second auxiliary pads ESD-P 1  and ESD-P 2  according to an exemplary embodiment. 
     Different from the touch screen panel  400  shown in  FIG.  9   , the touch screen panel  400  further includes the second auxiliary pads ESD-P 1  and ESD-P 2  to apply the constant DC voltage to the electrostatic discharge line ESD. The second auxiliary pads ESD-P 1  and ESD-P 2  are arranged in the first pad part  400 -PD. The second auxiliary pads ESD-P 1  and ESD-P 2  can be applied with the same voltage as the first auxiliary pads NS-P 1  and NS-P 2 . In addition, the second auxiliary pads ESD-P 1  and ESD-P 2  can be applied with a different voltage from the first auxiliary pads NS-P 1  and NS-P 2 . 
     Various defects, e.g., malfunction, damage, poor process, etc., may occur in the display device DA due to static electricity. Accordingly, when the electrostatic discharge line ESD is arranged at an outermost portion of the display device DA, the static electricity is prevented from entering the display device DA, and thus display quality of the display panel is improved. 
     Although the exemplary embodiments of the inventive technology have been described, it is understood that the present invention should not be limited to these exemplary embodiments but various changes and modifications can be made by one ordinary skilled in the art within the spirit and scope of the inventive technology as hereinafter claimed.