阅读说明：本技术 集成nfc天线的触摸屏及显示装置 (Touch screen integrated with NFC antenna and display device ) 是由 刘仕彬 钟德镇 乔艳冰 于 2019-08-08 设计创作，主要内容包括：一种集成NFC天线的触摸屏和显示装置,该触摸屏设有触控区和位于触控区外围的天线区,触摸屏包括基板、多个第一触控电极、多个第二触控电极、吸波层和NFC天线；多个第一触控电极和多个第二触控电极位于触控区内,NFC天线和吸波层位于天线区内,吸波层位于基板和NFC天线之间；吸波层与第一触控电极设置在同一层,或者吸波层与第二触控电极的至少部分设置在同一层。本发明的集成NFC天线的触摸屏和显示装置实现了更便捷直观的NFC功能,并减薄了集成NFC天线的触摸屏的整体厚度。(A touch screen and a display device integrated with an NFC antenna are provided, the touch screen is provided with a touch area and an antenna area located at the periphery of the touch area, and comprises a substrate, a plurality of first touch electrodes, a plurality of second touch electrodes, a wave absorbing layer and the NFC antenna; the plurality of first touch electrodes and the plurality of second touch electrodes are positioned in the touch area, the NFC antenna and the wave-absorbing layer are positioned in the antenna area, and the wave-absorbing layer is positioned between the substrate and the NFC antenna; the wave absorbing layer and the first touch electrode are arranged on the same layer, or the wave absorbing layer and at least part of the second touch electrode are arranged on the same layer. The touch screen and the display device integrated with the NFC antenna realize a more convenient and visual NFC function, and the overall thickness of the touch screen integrated with the NFC antenna is reduced.)

1. A touch screen integrated with an NFC antenna is characterized in that the touch screen is provided with a Touch Area (TA) and an antenna area (LA) located at the periphery of the Touch Area (TA); the touch screen comprises a substrate (10), a plurality of first touch electrodes (21), a plurality of second touch electrodes (22), a wave absorbing layer (30) and an NFC antenna (40);

the plurality of first touch electrodes (21) and the plurality of second touch electrodes (22) are located in the Touch Area (TA), the NFC antenna (40) and the wave-absorbing layer (30) are located in the antenna area (LA), and the wave-absorbing layer (30) is located between the substrate (10) and the NFC antenna (40);

the wave absorbing layer (30) and the first touch electrode (21) are arranged on the same layer, or at least part of the wave absorbing layer (30) and the second touch electrode (22) are arranged on the same layer.

2. An integrated NFC antenna touch screen according to claim 1 wherein the absorbing layer (30) is formed of a transparent conductive material.

3. The NFC-antenna-integrated touch screen according to claim 1, wherein each second touch electrode (22) comprises a plurality of sub-electrodes (221) and a plurality of bridge pads (222), the plurality of bridge pads (222) straddling over the first touch electrode (21) and electrically connecting the plurality of sub-electrodes (221) to constitute one second touch electrode (22);

the touch screen further comprises a first insulating layer (51a) and a second insulating layer (52 a);

the plurality of first touch electrodes (21) and the plurality of sub-electrodes (221) are located on the substrate (10), and the first insulating layer (51a) covers the plurality of first touch electrodes (21) and the plurality of sub-electrodes (221);

the plurality of bridging pads (222) and the wave-absorbing layer (30) are located on the first insulating layer (51a), and the second insulating layer (52a) covers the plurality of bridging pads (222) and the wave-absorbing layer (30);

the NFC antenna (40) is located on the second insulating layer (52 a).

4. The touch screen of the integrated NFC antenna according to claim 3, wherein the plurality of sub-electrodes (221) and the plurality of first touch electrodes (21) are made of the same material and formed in the same etching process, and the plurality of bridge pads (222) and the wave-absorbing layer (30) are made of the same material and formed in the same etching process.

5. The NFC-antenna-integrated touch screen according to claim 1, wherein each second touch electrode (22) comprises a plurality of sub-electrodes (221) and a plurality of bridge pads (222), the plurality of bridge pads (222) straddling over the first touch electrode (21) and electrically connecting the plurality of sub-electrodes (221) to constitute one second touch electrode (22);

the touch screen further comprises a third insulating layer (51b), the plurality of first touch electrodes (21), the plurality of sub-electrodes (221) and the wave-absorbing layer (30) are all located on the substrate (10), and the third insulating layer (51b) covers the plurality of first touch electrodes (21), the plurality of sub-electrodes (221) and the wave-absorbing layer (30);

the plurality of bridge pads (222) and the NFC antenna (40) are located on the third insulating layer (51 b).

6. The integrated NFC antenna touch screen of claim 5, wherein the plurality of bridge pads (222) and the NFC antenna (40) are made of the same material and formed in the same etching process.

7. An NFC antenna integrated touch screen according to claim 1, further comprising a fourth insulating layer (51 c);

the plurality of first touch electrodes (21) and the wave-absorbing layer (30) are positioned on the substrate (10), and the fourth insulating layer (51c) covers the plurality of first touch electrodes (21) and the wave-absorbing layer (30);

the plurality of second touch electrodes (22) and the NFC antenna (40) are located on the fourth insulating layer (51 c).

8. An NFC antenna integrated touch screen according to claim 1, wherein the NFC antenna (40) is formed of an opaque conductive material, the Touch Area (TA) is located in a display area, and the antenna area (LA) is located in a non-display area around the display area; or, the NFC antenna (40) is formed of a transparent conductive material, and the Touch Area (TA) and the antenna area (LA) are both located in a display area.

9. An NFC antenna integrated touch screen according to claim 1, wherein the NFC antenna (40) comprises a first NFC antenna (41), a second NFC antenna (42) and a third NFC antenna (43);

the first NFC antenna (41) comprises a coil body (411) located at the top end of a Touch Area (TA), a first connecting line (412) located on one side of the Touch Area (TA) and a second connecting line (413) located on the other side of the Touch Area (TA), the second NFC antenna (42) is arranged on the same side of the first connecting line (412), and the third NFC antenna (43) is arranged on the same side of the second connecting line (413).

10. A display device, comprising the NFC antenna integrated touch screen according to any one of claims 1 to 9, a color filter substrate (100), an array substrate (200), and a liquid crystal layer (80) disposed between the color filter substrate (100) and the array substrate (200), wherein the touch screen is disposed on a surface of the color filter substrate (100) on a side away from the liquid crystal layer (80).

Technical Field

The invention relates to the technical field of display, in particular to a touch screen integrated with an NFC antenna and a display device.

Background

Near Field Communication (NFC) is a technology for realizing Near Field wireless Communication based on mobile terminals such as mobile phones, and is mainly used for realizing Near Field contactless secure Communication.

An NFC antenna module is generally formed by an NFC antenna of an existing mobile terminal and a magnetic shielding sheet, the magnetic shielding sheet is mostly formed by ferrite materials, and the NFC antenna module is connected to a battery chamber cover of the mobile terminal by using a double-sided adhesive tape. The disadvantages mainly include: if a metal material is selected for the housing, signal propagation of the NFC antenna is affected, so that the structure limits the selection of a firm metal material for the housing of the mobile terminal when the material is selected. In addition, the problem that the connection position of the NFC antenna is worn or misaligned is easily caused when the battery and the shell are disassembled and assembled, and finally, the signal of the NFC antenna is deteriorated, and the use of the NFC function is influenced.

For solving above-mentioned problem, prior art has also proposed the touch-sensitive screen integrated with touch-control function and NFC function, but the NFC antenna stack is unfavorable for the attenuate of touch-sensitive screen thickness on the touch-sensitive screen, in addition, if do not set up the magnetic shield piece and probably lead to signal, touch-control signal and the electric field of control demonstration of NFC antenna to interfere with each other, if set up the magnetic shield piece of ferrite material then be unfavorable for realizing narrow frame, has also increased the process of touch-sensitive screen.

The foregoing description is provided for general background information and is not admitted to be prior art.

Disclosure of Invention

The invention aims to provide a touch screen integrated with an NFC antenna and a display device, which realize a more convenient and visual NFC function and reduce the overall thickness of the touch screen integrated with the NFC antenna.

The invention provides a touch screen integrated with an NFC antenna, which is characterized in that the touch screen is provided with a touch area and an antenna area positioned at the periphery of the touch area; the touch screen comprises a substrate, a plurality of first touch electrodes, a plurality of second touch electrodes, a wave absorbing layer and an NFC antenna; the plurality of first touch electrodes and the plurality of second touch electrodes are located in the touch area, the NFC antenna and the wave-absorbing layer are located in the antenna area, and the wave-absorbing layer is located between the substrate and the NFC antenna; the wave absorbing layer and the first touch electrode are arranged on the same layer, or at least part of the wave absorbing layer and the second touch electrode are arranged on the same layer.

Further, the wave absorbing layer is made of transparent conductive materials.

Each second touch electrode comprises a plurality of sub-electrodes and a plurality of bridging pads, and the bridging pads span over the first touch electrodes and are electrically connected with the sub-electrodes to form one second touch electrode; the touch screen further comprises a first insulating layer and a second insulating layer; the plurality of first touch electrodes and the plurality of sub-electrodes are positioned on the substrate, and the first insulating layer covers the plurality of first touch electrodes and the plurality of sub-electrodes; the plurality of bridging pads and the wave absorbing layer are positioned on the first insulating layer, and the second insulating layer covers the plurality of bridging pads and the wave absorbing layer; the NFC antenna is located on the second insulating layer.

Furthermore, the plurality of sub-electrodes and the plurality of first touch electrodes are made of the same material and formed in the same etching process, and the plurality of bridge pads and the wave-absorbing layer are made of the same material and formed in the same etching process.

Each second touch electrode comprises a plurality of sub-electrodes and a plurality of bridging pads, and the bridging pads span over the first touch electrodes and are electrically connected with the sub-electrodes to form one second touch electrode; the touch screen further comprises a third insulating layer, the plurality of first touch electrodes, the plurality of sub-electrodes and the wave absorbing layer are all located on the substrate, and the third insulating layer covers the plurality of first touch electrodes, the plurality of sub-electrodes and the wave absorbing layer; the plurality of bridge pads and the NFC antenna are located on the third insulating layer.

Furthermore, the plurality of bridge pads and the NFC antenna are made of the same material and formed in the same etching process.

Further, the touch screen further comprises a fourth insulating layer; the plurality of first touch electrodes and the wave-absorbing layer are positioned on the substrate, and the fourth insulating layer covers the plurality of first touch electrodes and the wave-absorbing layer; the plurality of second touch electrodes and the NFC antenna are located on the fourth insulating layer.

Further, the NFC antenna is made of opaque conductive materials, the touch control area is located in the display area, and the antenna area is located in the non-display area on the periphery of the display area; or, the NFC antenna is made of transparent conductive materials, and the touch area and the antenna area are both located in the display area.

Further, the NFC antennas include a first NFC antenna, a second NFC antenna, and a third NFC antenna; the first NFC antenna comprises a coil body located at the top end of the touch area, a first connecting line located on one side of the touch area and a second connecting line located on the other side of the touch area, the second NFC antenna is arranged on the same side as the first connecting line, and the third NFC antenna is arranged on the same side as the second connecting line.

The invention also provides a display device which comprises any one of the touch screen integrated with the NFC antenna, a color film substrate, an array substrate and a liquid crystal layer arranged between the color film substrate and the array substrate, wherein the touch screen is arranged on the surface of the color film substrate, which is far away from the liquid crystal layer.

According to the touch screen and the display device integrating the NFC antenna, the NFC antenna is arranged in the antenna area through the antenna area positioned on the periphery of the touch area, so that a more convenient and visual NFC function is realized. The wave absorbing layer is arranged below the NFC antenna and is arranged on the same layer as the first touch electrode, or is arranged on the same layer as at least part of the second touch electrode, the wave absorbing layer and the first touch electrode are made of the same material and formed in the same etching process, the overall thickness of the touch screen integrated with the NFC antenna is reduced, and the working procedures and the cost are saved.

Drawings

Fig. 1 is a schematic structural diagram of a touch screen integrated with an NFC antenna according to a first embodiment of the present invention.

Fig. 2 is a schematic diagram illustrating division of the touch screen shown in fig. 1.

Fig. 3 is a schematic structural diagram of a second touch electrode in the touch screen shown in fig. 1.

Fig. 4 is a schematic cross-sectional view of the touch screen shown in fig. 1.

Fig. 5(a) to 5(c) are schematic views of the layered structure of the touch screen shown in fig. 1.

Fig. 6 is a schematic structural diagram of a display device according to a first embodiment of the invention.

Fig. 7 is a schematic cross-sectional view of a touch screen integrated with an NFC antenna according to a second embodiment of the present invention.

Fig. 8(a) to 8(b) are schematic views of the layered structure of the touch screen shown in fig. 7.

Fig. 9 is a schematic structural diagram of a touch screen integrated with an NFC antenna according to a third embodiment of the present invention.

Fig. 10 is a schematic cross-sectional view of the touch screen shown in fig. 9.

Fig. 11(a) to 11(b) are schematic views of the layered structure of the touch screen shown in fig. 9.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

First embodiment

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a touch screen integrated with an NFC antenna according to a first embodiment of the present invention, and fig. 2 is a schematic area division diagram of the touch screen shown in fig. 1. The touch screen of the embodiment includes a touch area TA and an antenna area LA located at the periphery of the touch area TA, and the antenna area LA is disposed on the upper side and the left and right sides of the touch area TA. The touch screen comprises a substrate 10, a plurality of first touch electrodes 21, a plurality of second touch electrodes 22, a wave absorbing layer 30 and an NFC antenna 40. The plurality of first touch electrodes 21 and the plurality of second touch electrodes 22 are located in the touch area TA, the NFC antenna 40 and the wave-absorbing layer 30 are located in the antenna area LA, and the wave-absorbing layer 30 is located between the substrate 10 and the NFC antenna 40.

Fig. 1 only shows schematic structures of the first touch electrodes 21 and the second touch electrodes 22, in this embodiment, the first touch electrodes 21 are parallel to each other and are formed at intervals along a first direction, and the second touch electrodes 22 are parallel to each other and are formed at intervals along a second direction, the first direction intersects with the second direction, the first direction is, for example, a transverse direction of the touch screen, and the second direction is, for example, a longitudinal direction of the touch screen. Referring to fig. 3, each of the second touch electrodes 22 includes a plurality of sub-electrodes 221 and a plurality of bridging pads 222, and the plurality of bridging pads 222 spans over the first touch electrode 21 and electrically connects the plurality of sub-electrodes 221 to form one second touch electrode 22.

Fig. 4 is a schematic cross-sectional view of the touch screen in the present embodiment. The touch screen further includes a first insulating layer 51a, a second insulating layer 52a and a first upper cover layer 53a, the plurality of sub-electrodes 221 and the plurality of first touch electrodes 21 together form a touch electrode layer 20, the touch electrode layer 20 is located on the substrate 10, the first insulating layer 51a covers the plurality of sub-electrodes 221 and the plurality of first touch electrodes 21, the plurality of bridge pads 222 and the wave-absorbing layer 30 are located on the first insulating layer 51a, that is, in this embodiment, portions (bridge pads 222) of the wave-absorbing layer 30 and the second touch electrodes 22 are disposed on the same layer, and the second insulating layer 52a covers the plurality of bridge pads 222 and the wave-absorbing layer 30. The NFC antenna 40 is located on the second insulating layer 52a, and the first upper cover layer 53a covers the NFC antenna 40.

Specifically, referring to fig. 5(a), the structure of the touch electrode layer 20 is shown, in which the touch electrode layer 20 includes, for example, a metal conductive material such as Mo-Al-Mo, copper, silver, etc., and further includes, for example, a non-metal conductive material such as ITO (indium tin oxide), IZO (indium zinc oxide), graphene, etc. Preferably, the sub-electrodes 221 and the first touch electrodes 21 are made of the same material and formed in the same etching process. The first touch electrode 21 is in a grid shape, each sub-electrode 221 is formed by intersecting two wires, and the two wires are located in one grid of the first touch electrode 21.

Further, the touch screen further includes a control circuit 60, a first touch lead 210 and a second touch lead 220, wherein the control circuit 60 is connected to the first touch electrode 21 through the first touch lead 210, and is connected to the second touch electrode 22 through the second touch lead 220. The first touch lead 210, the second touch lead 220 and the touch electrode layer 20 are preferably made of the same material and formed in the same etching process. The plurality of first touch electrodes 21 serve as a touch driving layer, the plurality of second touch electrodes 22 serve as a touch sensing layer, and the control circuit 60 transmits a touch driving signal to the first touch electrodes 21 through the first touch leads 210 and receives a touch detection signal detected by the second touch electrodes 22 through the second touch leads 220; alternatively, the plurality of first touch electrodes 21 serve as a touch sensing layer, the plurality of second touch electrodes 22 serve as a touch driving layer, and the control circuit 60 receives a touch detection signal detected by the first touch electrodes 21 through the first touch leads 210 and transmits a touch driving signal to the second touch electrodes 22 through the second touch leads 220. The control circuit 60 is disposed on a flexible circuit board, for example, and the flexible circuit board is electrically connected to the touch screen through a bonding process.

Referring to fig. 5(b), the structure of the bridging pads 222 and the wave-absorbing layer 30 is shown, each bridging pad 222 bridges two sub-electrodes 221 through a contact hole in the first insulating layer 51a, and the plurality of bridging pads 222 and the plurality of sub-electrodes 221 together form one second touch electrode 22. The material of the bridge pad 222 is, for example, ITO or IZO, and the wave-absorbing layer 30 of the present embodiment is formed by a transparent conductive material such as ITO or IZO. Preferably, the bridge pad 222 and the wave-absorbing layer 30 are made of the same material, and experiments show that a transparent conductive material such as ITO and IZO has a good microwave shielding effect, and can replace a ferrite material in the prior art as a wave-absorbing substrate located below the NFC antenna 40, so that not only can an effect of weakening a metal eddy current be achieved, but also the touch detection precision and the display effect can be prevented from being affected by an NFC signal. In this embodiment, the plurality of bridging pads 222 and the wave-absorbing layer 30 are both located on the first insulating layer 51a, the bridging pads 222 are located in the touch area TA, the wave-absorbing layer 30 is located in the antenna area LA around the touch area TA, and the bridging pads 222 and the wave-absorbing layer 30 are made of the same material and formed in the same etching process, so that the overall thickness of the touch screen can be reduced, the number of processes can be effectively reduced, and the cost can be saved.

Referring to fig. 5(c), a structure of the NFC antenna 40 is shown. NFC antenna 40 is located and is inhaled layer 30 top, including first NFC antenna 41, second NFC antenna 42 and third NFC antenna 43, first NFC antenna 41, second NFC antenna 42 and third NFC antenna 43 set up respectively at the top edge of touch-sensitive screen, left edge and right edge, first NFC antenna 41, second NFC antenna 42 and third NFC antenna 43 constitute by the coil that the number of turns is 3 ~ 5 circles respectively, the both ends of coil all extend to the lower limb of touch-sensitive screen. In this embodiment, the NFC antenna 40 is separately located on the second insulating layer 52a, so as to avoid interference and shielding between the signals of the first touch electrode 21 and the second touch electrode 22 and the NFC signal.

Further, the touch screen further includes a first antenna pin 41a, a second antenna pin 41b, a third antenna pin 42a, a fourth antenna pin 42b, a fifth antenna pin 43a, and a sixth antenna pin 43b located at the lower edge. The first antenna pin 41a and the second antenna pin 41b are respectively connected to two ends of the first NFC antenna 41, the third antenna pin 42a and the fourth antenna pin 42b are respectively connected to two ends of the second NFC antenna 42, and the fifth antenna pin 43a and the sixth antenna pin 43b are respectively connected to two ends of the third NFC antenna 43. The first antenna pin 41a, the third antenna pin 42a, and the fourth antenna pin 42b are located on the left side of the touch area TA, and the second antenna pin 41b, the fifth antenna pin 43a, and the sixth antenna pin 43b are located on the right side of the touch area TA. The first NFC antenna 41 includes a coil body 411 located at the top end of the touch area TA, a first connection line 412 located at one side of the touch area TA, and a second connection line 413 located at the other side of the touch area TA, where the first connection line 412 is connected between the coil body 411 and the first antenna pin 41a, and the second connection line 413 is connected between the coil body 411 and the second antenna pin 41 b; the second NFC antenna 42 is located on the left side of the touch area TA, and the third NFC antenna 43 is located on the right side of the touch area TA, that is, the second NFC antenna 42 is disposed on the same side as the first connection line 412, and the third NFC antenna 43 is disposed on the same side as the second connection line 413.

The first antenna pin 41a, the second antenna pin 41b, the third antenna pin 42a, the fourth antenna pin 42b, the fifth antenna pin 43a, and the sixth antenna pin 43b are electrically connected to the driving circuit 60, the driving circuit 60 transmits an electrical signal to the first NFC antenna 41, the second NFC antenna 42, and the third NFC antenna 43 to generate an NFC signal (near field communication signal), the NFC signal operates in a frequency range of 13.56MHz, and an operating distance can reach about 10 cm. Further, the driving circuit 60 may also selectively transmit electrical signals to one or more of the first NFC antenna 41, the second NFC antenna 42 and the third NFC antenna 43, such that the NFC signals have directional characteristics, such as: in the NFC application where the upper edge of an electronic device such as a mobile phone is close to or extends into an external NFC sensor, only the first NFC antenna 41 is operated. Another example is as follows: the second NFC antenna 42 is in the first mode when operating, the third NFC antenna 43 is in the second mode when operating, and the external NFC sensing device provides different functional feedback by determining whether the electronic device that is close to is in the first mode or the second mode.

For any of the first NFC antenna 41, the second NFC antenna 42, and the third NFC antenna 43, assuming that the impedance of the excitation source is 50 Ω and the characteristic impedance is also 50 Ω, the impedance is (0.1929+ j × 13.3958) Ω at the frequency point of 13.56 MHz. The equivalent resistance of the load is 0.1929 Ω, and the equivalent inductance is L13.3958/(2 × pi × 13.56 × 106) ═ 157.307nH, that is, the load can be equivalent to a resistance of 0.1929 Ω and an inductance of 157.307nH connected in series.

The material of the NFC antenna 40 includes, for example, ITO, IZO, copper, silver, graphene, or the like. When the NFC antenna 40 is formed of an opaque conductive material such as copper or silver, the touch area TA is located in the display area (AA area), and the antenna area LA is located in the non-display area around the display area, that is, the front surface housing of the electronic device such as a mobile phone covers the antenna area LA, and the front surface housing preferably uses a non-metallic material such as ceramic or plastic. When NFC antenna 40 is formed by transparent conductive materials such as ITO, IZO, touch-control district TA and antenna area LA all are located the display area, not only are favorable to realizing narrow frame, and electronic equipment's shell selection material also no longer has the restriction.

Referring to fig. 6, the present embodiment further provides a display device, where the display device includes any one of the above touch screens integrated with NFC antennas, a color film substrate 100, an array substrate 200, and a liquid crystal layer 80 disposed between the color film substrate 100 and the array substrate 200, where the touch screen is disposed on a surface of the color film substrate 100 on a side away from the liquid crystal layer 80. The color filter substrate 100 includes a substrate 10, a color filter layer 11, and a shielding layer 12, the color filter substrate 100 and the touch screen share substrate 10, the color filter layer 11 includes a black matrix with an opening and a color resistor filled in the opening, and the shielding layer 12 is formed of a transparent conductive material such as ITO or IZO, for example, and is used for shielding electrostatic interference. The array substrate 200 includes a substrate 70, a lower polarizer 73 disposed on a side of the substrate 70 away from the liquid crystal layer 80, a thin film transistor 71 disposed on a side of the substrate 70 facing the liquid crystal layer 80, a common electrode (not shown), a pixel electrode 72, and the like. Further, the display device further includes an upper polarizer 13 disposed on the first upper cover layer 53a on the side away from the liquid crystal layer 80, and a cover substrate 14 covering the upper polarizer 13.

The screen display content of the display device is matched with the position of the NFC antenna 40, so that more natural feedback and more intuitive interaction can be realized, and users can understand and apply the NFC function without barriers. For example, when the screen displays "please get close to the X device", when the distance between the NFC antenna 40 of the display device and the external NFC sensing device (i.e., the X device) is smaller than a certain distance to realize the NFC function, the user can get a good sensing effect by getting the touch screen close to the X device, rather than getting the cover of the battery chamber or other parts of the electronic device close to the X device.

Second embodiment

Referring to fig. 7, a touch screen integrated with an NFC antenna according to a second embodiment of the present invention is different from the first embodiment in that a plurality of first touch electrodes 21, a plurality of second touch electrodes 22, a wave-absorbing layer 30, and an NFC antenna 40 in the touch screen have a double-layer structure.

The touch screen of this embodiment includes a third insulating layer 51b and a second upper cover layer 52b, the multiple sub-electrodes 221 and the multiple first touch electrodes 21 jointly form a touch electrode layer 20, the touch electrode layer 20 and the wave-absorbing layer 30 are located on the substrate 10, that is, in this embodiment, the wave-absorbing layer 30, the first touch electrodes 21 and the portions (the sub-electrodes 221) of the second touch electrodes 22 are disposed on the same layer, the third insulating layer 51b covers the multiple sub-electrodes 221, the multiple first touch electrodes 21 and the wave-absorbing layer 30, the multiple bridge pads 222 and the NFC antenna 40 are located on the third insulating layer 51b, and the second upper cover layer 52b covers the multiple bridge pads 222 and the NFC antenna 40.

Specifically, please refer to fig. 8(a) and 8(b), where fig. 8(a) shows the structures of the touch electrode layer 20 and the wave-absorbing layer 30, and fig. 8(b) shows the structures of the bridge pad 222 and the NFC antenna 40. Preferably, the plurality of bridge pads 222 and the NFC antenna 40 are made of the same material and formed in the same etching process, for example: the plurality of bridging pads 222 and the NFC antenna 40 are made of ITO, IZO, and other transparent conductive materials and are made of the same material, and at this time, the touch area TA and the antenna area LA are both located in the display area. In other embodiments, when the bridge pad 222 is made of a transparent conductive material, the plurality of first touch electrodes 21 and the plurality of sub-electrodes 221 in the touch electrode layer 20 may be made of a metal material to increase the conductivity and the contact yield, and the wave-absorbing layer 30 may be formed on the substrate 10 together with the touch electrode layer 20 by etching or local deposition.

The touch screen of this embodiment adopts a double-layer structure, that is, the touch electrode layer 20 and the wave-absorbing layer 30 are used as a first conductive layer, the plurality of bridging pads 222 and the NFC antenna 40 are used as a second conductive layer, the first conductive layer and the second conductive layer are separated by a third insulating layer 51b, and the plurality of bridging pads 222 located on the second conductive layer are bridged by the plurality of sub-electrodes 221 located on the first conductive layer through the through holes. The first conducting layer and the second conducting layer fully utilize the space of the TA and the LA of the antenna area, and the whole thickness of the touch screen is reduced.

Third embodiment

Referring to fig. 9, a difference between the touch screen integrated with an NFC antenna according to the third embodiment of the present invention and the first embodiment is that the second touch electrodes 22 are not bridged by the bridging pad 222, and the touch screen includes a plurality of first touch electrodes 21, a plurality of second touch electrodes 22, a wave-absorbing layer 30, and an NFC antenna 40 that are of a double-layer structure.

Referring to fig. 10, which shows a cross-sectional view of the touch screen of the present embodiment, the first touch electrode 21 and the second touch electrode 22 are independent of each other and located on different layers, and are insulated from each other. The touch screen of this embodiment includes a fourth insulating layer 51c and a third upper cover layer 52c, the plurality of first touch electrodes 21 and the wave-absorbing layer 30 are located on the substrate 10, that is, in this embodiment, the wave-absorbing layer 30 and the first touch electrodes 21 are disposed on the same layer, the fourth insulating layer 51c covers the plurality of first touch electrodes 21 and the wave-absorbing layer 30, the plurality of second touch electrodes 22 and the NFC antenna 40 are located on the fourth insulating layer 51c, and the third upper cover layer 52c covers the plurality of second touch electrodes 22 and the NFC antenna 40.

Specifically, please refer to fig. 11(a) and 11(b), where fig. 11(a) shows the structures of the first touch electrode 21 and the wave-absorbing layer 30, and fig. 11(b) shows the structures of the second touch electrode 22 and the NFC antenna 40. Preferably, the plurality of first touch electrodes 21 and the wave-absorbing layer 30 are made of the same material and formed in the same etching process, and the plurality of second touch electrodes 22 and the NFC antenna 40 are made of the same material and formed in the same etching process. For example, the following are: the first touch electrode 21 and the wave-absorbing layer 30 are made of transparent conductive materials such as ITO and IZO and made of the same material, the plurality of second touch electrodes 22 and the NFC antenna 40 are made of transparent conductive materials such as ITO and IZO and made of the same material, and at this time, the touch area TA and the antenna area LA are both located in the display area. The second touch electrode 22 of the present embodiment is not formed by bridging the bridging pad 222, so that the first touch electrode 21 and the second touch electrode 22 can achieve a better signal transmission effect even if transparent conductive materials are selected, so that the material selection range is wider, and the material selection range is conducive to being formed by etching together with the wave-absorbing layer 30 or the NFC antenna 40, so as to save the process and cost.

The touch screen of the embodiment adopts a double-layer structure, that is, the plurality of first touch electrodes 21 and the wave-absorbing layer 30 are used as first conductive layers, the plurality of second touch electrodes 22 and the NFC antenna 40 are used as second conductive layers, and the first conductive layers and the second conductive layers are separated by the fourth insulating layer 51 c. The first conducting layer and the second conducting layer fully utilize the space of the TA and the LA of the antenna area, and the whole thickness of the touch screen is reduced.

In summary, according to the touch screen and the display device integrated with the NFC antenna, the NFC antenna 40 is arranged in the antenna area LA located at the periphery of the touch area TA, so that a more convenient and intuitive NFC function is realized. The wave absorbing layer 30 is arranged below the NFC antenna 40, is arranged on the same layer as the first touch electrode 21, or is arranged on the same layer as at least part of the second touch electrode 22, is made of the same material and is formed in the same etching process, the whole thickness of the touch screen integrated with the NFC antenna is reduced, and the working procedures and the cost are saved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.