Touch panel

A touch panel may include a substrate, a touch unit region and a covering layer. The touch unit region includes first electrode and a second electrode isolated from the first electrode. The covering layer covers at least one of the first electrode and the second electrode and has a touch surface. A distance between the touch surface and the first electrode or the second electrode ranges between 0.01 micrometers and 100 micrometers. A mutual capacitance value between the first electrode and the second electrode ranges between 0.1 pF and 10 pF when a touch has not occurred yet.

TECHNICAL FIELD

The disclosure relates in general to a panel, and more particularly to a touch panel.

BACKGROUND

In general, a touch panel may include a cover lens for protecting sensing structures of the touch panel. To follow the trend of the thin and compact, it is considered that the cover lens is thinned or omitted.

However, such design makes it possible to cause the problem of an error response point to occur.

SUMMARY

According to one embodiment, a touch panel is provided. The touch panel may include a substrate, a touch unit region and a covering layer. The touch unit region may include first electrode and a second electrode isolated from the first electrode. The covering layer covers at least one of the first electrode and the second electrode and has a touch surface. A distance between the touch surface and the first electrode or the second electrode ranges between 0.01 micrometers and 100 micrometers. A mutual capacitance value between the first electrode and the second electrode ranges between 0.1 pF and 10 pF when a touch has not occurred yet.

In the following detailed description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be clear, that one or more embodiments may be practiced without these details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.

DETAILED DESCRIPTION

Referring toFIGS. 1A and 1B,FIG. 1Ashows a top view of a touch panel according to an embodiment of the disclosure, andFIG. 1Bshows a cross sectional view of the touch panel along a direction1B-1B′. The touch panel100includes a substrate110, a plurality of touch unit regions120and a cover layer130.

The touch unit regions120may be arranged as an n×m array, wherein n and m may be integers which are equal to or larger than 1, and n and m may be the same or different value. In the present embodiment, the touch unit region120may be arranged as 3×3 array. Each touch unit region120may include a first electrode121, a second electrode122, an electrode pad123and an insulation layer124.

In the present embodiment, the first electrode121and the second electrode122may be formed on the same side of the substrate110. For example, as shown inFIG. 1B, the first electrode121and the second electrode122are formed on a first surface110uof the substrate110. In another embodiment, the first electrode121and the second electrode122may be formed on opposite two sides respectively.

The first electrode121of each touch unit region120includes a first sub-electrode1211and a second sub-electrode1212. The electrode pad123connects the first sub-electrode1211and the second sub-electrode1212for electrically connecting the first sub-electrode1211and the second sub-electrode1212. The number of the electrode pad123of each touch unit region120is one, for example; however, such exemplification is not meant to be for limiting. The insulation layer124separates the electrode pad123from the second electrode122for electrically isolating the first electrode121and the second electrode122and preventing from the first electrode121being electrically short with the second electrode122. In one embodiment, the insulation layer124has a thickness T1(as illustrated inFIG. 1B) ranging 0.01 micrometers and 5 micrometers.

As shown inFIG. 1A, the second sub-electrode1212of the touch unit region120may connect with the first sub-electrode1211of the adjacent touch unit region120arranged in the same row (along a first direction D1, for example), such that the first electrodes121of adjacent two touch unit regions120connect with each other. Several first electrodes121of the touch unit regions120in the same row may connect to form a first axial electrode for sensing a touch. In addition, adjacent two first axial electrodes (that is, several first axial electrodes in a second direction D2) may not connect with each other for preventing from being electrically short with each other. In one embodiment, the touch panel100may further include a plurality of signal traces140each connecting with the corresponding first axial electrode and extending to a side of the substrate110for transmitting the signal for the first axial electrode.

In the present embodiment, the first electrodes121of the adjacent two touch unit regions120may be designed as a symmetrical structure and/or the second sub-electrode1212of the touch unit region120and the first sub-electrode1211of the adjacent touch unit region120may be designed as a symmetrical structure. In another embodiment, the first electrodes121of the adjacent two touch unit regions120may be designed as a non-symmetrical structure and/or the second sub-electrode1212of the touch unit region120and the first sub-electrode1211of the adjacent touch unit region120may be designed as a non-symmetrical structure.

As shown inFIG. 1A, the second electrodes122of the adjacent two touch unit regions120in the same column (in the second direction D2, for example) may connect with each other, such that the second electrodes122of the several touch unit regions120in the same column may be arranged as a second axial electrode for sensing the touch. In addition, adjacent two second axial electrodes (that is, several second axial electrodes in the first direction D1) may not connect with each other for preventing from being electrically short with each other.

The first electrode121and the second electrode122may be formed by winding electrode wires. The area of the electrode wires may be less than that of the touch unit regions120, and accordingly an occupying area of the first electrode121and the second electrode122in the touch unit regions120may be reduced. As a result, the self capacitance value of the first electrode121and the self capacitance value of the second electrode122may be reduced when the touch occurs, and accordingly the problem of the error response point may be prevented (if a self capacitance increase time exceeds an allowed self capacitance increase time, the problem of the error response point will occur).

Referring toFIG. 2, a capacitance change diagram of the touch panel after and before being touched. In the present embodiment, the mutual capacitance between the first electrode121and the second electrode122ranges between 0.1 pF and 10 pF, for example. InFIG. 2, a curve C1represents a relationship between the mutual capacitance decrease ratio and the self capacitance increase time after the touch in a conventional touch panel, and a curve C2represents a relationship between the mutual capacitance decrease ratio and the self capacitance increase time after the touch in the touch panel100. As shown trend of the curves C1and C2, after the touch, in both the conventional touch panel and the touch panel100, the mutual capacitance value between the first electrode and the second electrode decrease, and the self capacitance value of electrode (takes one of the first electrode121and the second electrode122for example) increase.

As shown inFIG. 2, in terms of the mutual capacitance decrease ratio being 47%, the allowed self capacitance increase time of the conventional touch panel is about 2.5 times, while the allowed self capacitance increase time of the touch panel100may reach 20 times, and accordingly the touch panel100prevents from the error response point occurring. In terms of the allowed self capacitance increase time of the first electrode121, the first electrode121has a first base self capacitance value before the touch, the first electrode121has a first increase self capacitance value after the touch, and the allowed self capacitance increase time of the first electrode121is the ratio of the first increase self capacitance value to the first base self capacitance value. In the present embodiment, the allowed self capacitance increase time of the first electrode121is less than, equal to or larger than 37. Similarly, In terms of the allowed self capacitance increase time of the second electrode122, the second electrode122has a second base self capacitance value before the touch, the second electrode122has a second increase self capacitance value after the touch, and the allowed self capacitance increase time of the second electrode122is the ratio of the second increase self capacitance value to the second base self capacitance value. The allowed self capacitance increase time of the second electrode122is less than, equal to or larger than 37.

In terms of the measurement for the allowed self capacitance increase time, for example, one terminal of a capacitance meter, for example a LCR meter (not illustrated) meter may connect the first electrode121or the second electrode122of the touch unit region120, and another terminal of the LCR meter may be grounded. Then, a capacitance value of the first electrode121or the second electrode122is read to serve as a base self capacitance value. Then, a change capacitance value of the first electrode121or the second electrode122is read to serve as an increase self capacitance value after an insulation object or a conductive object approaches the touch unit region120or touch the touch unit region120through the cover layer130. Then, the aforementioned steps may be repeated for several times (more than 10 times, for example), and then an average value of several base self capacitance values is calculated to serve as a base self capacitance average value, and an average value of several increase self capacitance values is calculated to serve as an increase self capacitance average value. Then, a ratio of the increase self capacitance average value to the base self capacitance average value is calculated to serve as the self capacitance increase time. In one embodiment, the measurement for the allowed self capacitance increase time may be performed under the circumstances of omitting the cover lens, thinning the cover layer130or omitting the cover layer130.

In addition, if the cover lens is omitted or thinned, the self capacitance increase time is increased after the touch, and the error response point occurs (if the self capacitance increase time exceeds the allowed self capacitance increase time, the error response point will occur). For example, as shown inFIG. 2, under the circumstances of omitting or thinning the cover lens, the self capacitance increase time is about 20 times after the touch (the mutual capacitance decrease ratio being 47% is taken for example, as shown in the touch point P1), which is higher than the allowance range of the curve C1, and accordingly the error response point occurs.

Since the first electrode121and the second electrode122of the touch panel100have low self capacitance values, the self capacitance increase time is increased. In terms of the mutual capacitance decrease ratio being 47%, the allowed self capacitance increase time of the touch panel100may increase by 20 times. Under the design, even though the cover lens is omitted or thinned, or the cover layer130is omitted, the self capacitance increase time of the touch panel100is still lower than the range of the curve C2after being touched (the touch point P1, for example), and accordingly the problem of the error response point may be resolved. In one embodiment, even though a distance H1between a touch surface130sof the cover layer130and the first electrode121or the second electrode122is less than or equal to 100 micrometers, or a distance H1is 0.01 micrometers, the problem of error response point may still be resolved.

In addition, the self capacitance value and the mutual capacitance value of the electrodes may be reduced by several ways. For example, a width of the electrode, a ratio of an area of the electrode to an area of the touch unit region, an extension form of the electrode, a thickness of the electrode and/or a size of the electrode pad.

In terms of the width of the electrode, as shown in an enlargement diagram of a local portion a′ ofFIG. 1A, in one embodiment, the width t1of the first electrode121and/or the width t2of the second electrode122may range between 5 micrometers and 200 micrometers, and accordingly the self capacitance value may be reduced. In one embodiment, the width t1of the first electrode121and/or the width t2of the second electrode122may be different or substantially the same.

In terms of the area of the electrode, in one touch unit region120, the first electrode121and the second electrode122occupy an electrode area A1, wherein a ratio (A1/A2) of the electrode area A1to a unit area A2(as shown inFIG. 1A) of the touch unit region120may be less than or equal to 50%, and accordingly the self capacitance increase time may be increased. In one embodiment, the unit area A2may range about 9 mm2and about 49 mm2.

In terms of extension form of the electrode, the first electrode121and the second electrode122may form any shape. For example, the first electrode121may form at least one recess121rand at least one protrusion121p, and the second electrode122may form at least one recess122rand at least one protrusion122p. In the present embodiment, the number of the protrusions121pof the first electrode121of one touch unit region120is six, and the number of the recesses121rof the first electrode121of one touch unit region120is four, for example. In another embodiment, the number of the protrusions121pmay be less or more than six, and the number of the recesses121rmay be less or more than four. In addition, the number of the protrusions122pof the second electrode122of one touch unit region120is eight, and the number of the recesses122rof the second electrode122of one touch unit region120is six, for example. In another embodiment, the number of the protrusions122pmay be less or more than eight, and the number of the recesses122rmay be less or more than six. The protrusion121pof the first electrode121may insert the corresponding recess122rof the second electrode122, and the protrusion122pof the second electrode122may insert the corresponding recess121rof the first electrode121, such that an interval h between the first electrode121and the second electrode122may decrease and become uniform. In one embodiment, the interval h ranges between 5 micrometers and 200 micrometers. In another embodiment, the interval h of the same touch unit region120may vary, for example, the same touch unit region120may have several different intervals h, such as 5 micrometers and 200 micrometers simultaneously.

In another embodiment, any of all or some touch unit regions120may include a plurality of electrode pads123, wherein one of the electrode pads123may be formed between one protrusion121pof the first sub-electrode1211and one opposite protrusion121pof the second sub-electrode1212to connect the two protrusions121p, and another of the electrode pads123may be formed between another protrusion121pof the first sub-electrode1211and another opposite protrusion121pof the second sub-electrode1212to connect the two protrusions121p.

In terms of the thickness of the electrode, as shown inFIG. 1B, the thickness T2of the first electrode121may range between 0.01 micrometers and 5 micrometers, and the thickness T3of the second electrode122may range between 0.01 micrometers and 5 micrometers. In an embodiment, the thickness T1is larger than the thickness T2and the thickness T3.

In terms of the size of the electrode pad, as shown inFIG. 1A, the length L1of the electrode pad123in the direction D1may range between 100 micrometers and 1000 micrometers, and the width t3of the electrode pad123may range 5 micrometers and 1000 micrometers. In one embodiment, the width t1of the first electrode121, the width t2of the second electrode122and/or the width t3of the electrode pad123may be different or substantially the same. In addition, as shown inFIG. 1B, the thickness T4of the electrode pad123may range between 0.01 micrometers and 5 micrometers, for example.

In addition, the structure of the electrode may be a composite structure. For example, as shown in an enlargement diagram of a local portion b′ ofFIG. 1Aand an enlargement diagram ofFIG. 1B, the second electrode122includes a first conductive layer1221and a second conductive layer1222contacting with the first conductive layer1221, wherein the conductivity of one of the first conductive layer1221and the second conductive layer1222may be greater than the conductivity of another of the first conductive layer1221and the second conductive layer1222, and accordingly the whole conductivity of the second electrode122may be increased. For example, one of the first conductive layer1221and the second conductive layer1222may be made of metal, such as silver, and another of the first conductive layer1221and the second conductive layer1222may be made of transparent material, such as indium tin oxide (ITO), aluminum zinc oxide (AZO), ZnO, gallium zinc oxide (GZO), In2O3, indium zinc oxide (IZO), TiO2, fluorine-doped tin oxide (FTO), SnO2, CdO, conductive polymer (such as PEDOT:PSS), CNTs, etc. In addition, the first electrode121may have a composite structure similar to that of the second electrode122, and the similarity is not repeated.

In addition, the area of the first conductive layer1221and the area of the second conductive layer1222may be the same or different. For example, the area of the second conductive layer1222may be less than the area of the first conductive layer1221. In another embodiment, the area of the second conductive layer1222may be equal to the area of the first conductive layer1221.

As shown inFIG. 1B, the cover layer130may cover the touch unit region120for protecting the electrode structures in the touch unit region120. The cover layer130has a touch surface130s, and user may operate the touch panel100through the touch surface130s. Since the first electrode121and the second electrode122have low self capacitance values, the problem of the error response point may be prevented even though thinning the cover layer130. In one embodiment, the distance H1between the touch surface130sand the first electrode121or the second electrode122may range 0.01 micrometers and 100 micrometers, such as 15 micrometers. The distance H1may be the shortest distance between the touch surface130sand the first electrode121, the second electrode122or the electrode pad123. For example, in the present embodiment, the shortest distance is the distance between the electrode pad123disposed above the insulation layer124and the touch surface130s, and thus the distance H1is the distance between the electrode pad123and the touch surface130s. In one embodiment, the cover layer130may be made of polyethylene terephthalate (PET), poly(ethylene glycol)2,6-naphthalate (PEN), polyethylene terephthalate dimethyl cyclohexane (PCT), polyether sulfone (PES), polymethyl methacrylate (PMMA), polycarbonate (PC), glass, photoresistor, SiNx, SiOx, polymer resin composed of acrylic acid or combination thereof. In addition, the cover layer130may have single layer or multi layers. In terms of multi layers, each layer may be made of one or the combination of the aforementioned materials.

In the present embodiment, as shown in the enlargement diagram ofFIG. 1A, the number of the electrode pad123is single and extends in a straight; however, such exemplification is not meant to be for limiting.

Referring toFIGS. 3A to 3E, top views of a plurality of electrode pads according to other embodiments of the disclosure are shown. As shown inFIG. 3A, the number of the electrode pads123may be two or more, and two terminals of each electrode pad123connect the first sub-electrode1211and the second sub-electrode1212. As shown inFIG. 3B, the number of the electrode pads123may be several, such as the first electrode pad123′ and the second electrode pad123″, wherein two terminals of the first electrode pad123′ connect the first sub-electrode1211and the second sub-electrode1212, and two terminals of the second electrode pad123″ connect the first electrode pads123′. As shown inFIG. 3C, the electrode pad123may extend in a curved line, and two terminals of the electrode pad123connect the first sub-electrode1211and the second sub-electrode1212. As shown inFIG. 3D, two electrode pads123may intersect and two terminals of each electrode pad123connect the first sub-electrode1211and the second sub-electrode1212. As shown inFIG. 3E, the electrode pad123may extend in a circuitous line, and two terminals of the electrode pad123connect the first sub-electrode1211and the second sub-electrode1212.

As described above, the number of the electrode pads123may be single or several, the electrode pad123may extend in a straight, a curved line or a circuitous line, two electrode pads123may be parallel to each other or intersect, and/or one or some of several electrode pads123may connect with another or others of the electrode pads123. That is, the electrode pad123may connect the first sub-electrode1211and the second sub-electrode1212, and the present disclosure is not limited to the number of the electrode pad123and/or extension form of the electrode pad123.

Referring toFIG. 4, a top view of a touch panel according to another embodiment of the disclosure is shown. The touch panel200includes the substrate110, a plurality of touch unit regions120and the cover layer130(not illustrated). Each touch unit region120may include a first electrode121, a second electrode122, an electrode pad123and an insulation layer124. The first electrode121of each touch unit region120may include the first sub-electrode1211and the second sub-electrode1212separated from the first sub-electrode1211. In the present embodiment, the second sub-electrode1212of one touch unit region120and the first sub-electrode1211of the adjacent touch unit region120may be designed as a symmetrical structure. In addition, in the touch panel200, the first sub-electrode1211of one touch unit region120and the first sub-electrode1211of the adjacent touch unit region120may have different structures and/or the second sub-electrode1212of one touch unit region120and the second sub-electrode1212of the adjacent touch unit region120may have different structures. In one embodiment, the touch panel200further includes a plurality of signal traces140each connecting with the corresponding first axial electrode (which consists of several first electrodes121in the same row) and extending to a side of the substrate110for transmitting signal for the corresponding first axial electrode.

Referring toFIG. 5, a top view of a touch panel according to another embodiment of the disclosure is shown. The touch panel300includes the substrate110, a plurality of touch unit regions120and the cover layer130(not illustrated).

Each touch unit region120includes the first electrode121and the second electrode122. The second electrodes122of adjacent two touch unit regions120in the same column (in second direction D2, for example) connect with each other to form a second axial electrode. In the present embodiment, the second axial electrode may serve as a scan electrode, and the first electrode121may serve as a sensing electrode; however, such exemplification is not meant to be for limiting.

Similar to aforementioned embodiment, the electrode wires may wind to form the first electrode121and the second electrode122. In one touch unit region120, the electrode area of the electrode wires is less than the unit area of the touch unit region120, and thus the occupied area by the first electrode121and the second electrode122may be reduced. As a result, the touch panel300further includes a plurality of signal traces140each connecting with the corresponding first electrode121and extending to a side of the substrate110for transmitting touch signal in the touch unit region120.

Referring toFIG. 6, a top view of a touch panel according to another embodiment of the disclosure is shown. The touch panel400includes the substrate110, a plurality of touch unit regions120and the cover layer130(not illustrated). Each touch unit region120may include the first electrode121, the second electrode122, the electrode pad123and the insulation layer124.

In the present embodiment, each touch unit region120may omit the electrode pad123and the insulation layer124in the rightmost column (in the second direction D2, for example), and the first electrode121of each touch unit region120may include the first sub-electrode1211and the second sub-electrode1212except for the touch unit regions120in the rightmost column (in the second direction D2, for example).

In the present embodiment, the touch panel400may further include a plurality of signal traces140each connecting with the corresponding first axial electrode (which consists of several first electrodes121in the same row) and extending to a side of the substrate110for transmitting the signal for the first axial electrode.

Referring toFIG. 7, a top view of a touch panel according to another embodiment of the disclosure is shown. The touch panel500includes the substrate110, a plurality of touch unit regions120and the cover layer130(not illustrated). The touch unit regions120may be divided into two touch regions520. In the present embodiment, two touch regions520may be electrically isolated from each other. Two touch regions520may be two mirror structures. In addition, each touch region520may have pattern similar to that of the touch unit region120of theFIG. 1A, 4, 5 or 6. Two individual touch regions520may be two display regions capable of displaying two different frames respectively, such that the two touch regions520may be operated independently.

In addition, each touch unit region120may include the first electrode121, the second electrode122, the electrode pad123and the insulation layer124. In the present embodiment, any of some touch unit regions120may include the first sub-electrode1211and the second sub-electrode1212separated from the first sub-electrode1211, and others touch unit regions120, such as the touch unit regions120in middle position of the touch panel500, are not limited thereto. In one embodiment, the touch panel500includes a plurality of signal traces140each connecting with the corresponding first axial electrode (which consists of several first electrodes121in the same row) and extending to a side of the substrate110for transmitting the signal for the first axial electrode.

Referring toFIGS. 8A to 8C, several diagrams of a touch panel according to another embodiment of the disclosure are shown,FIG. 8Ashows a top view (the second electrode122is not illustrated) of the first electrode121,FIG. 8Bshows a top view (the first electrode121is not illustrated) of the second electrode122, andFIG. 8Cshows a cross sectional view (the second electrode122ofFIG. 8Bis also illustrated) of the first electrode121along a line8C-8C′.

The touch panel600includes the substrate110, a plurality of touch unit regions120and two cover layers130(not illustrated). In one embodiment, the touch panel600may further include a plurality of signal traces140each connecting with the corresponding first axial electrode (which consists of several first electrodes121in the same row) and extending to a side of the substrate110for transmitting the signal for the first axial electrode.

In the present embodiment, the first electrode121and the second electrode122are formed on opposite two sides of the substrate110. For example, the first electrode121and the electrode pad123are formed on the first surface110uof the substrate110, and the second electrode122is formed on the second surface110bof the substrate110, wherein the second surface110bis opposite to the first surface110u. In addition, the cover layers130cover the first electrode121and the second electrode122respectively for protecting the first electrode121and the second electrode122.

Similar to the touch panel600ofFIGS. 8A to 8C, the first electrode121and the second electrode122ofFIG. 1A, 4, 5, 6 or 7may be formed on opposite two sides of the substrate110.

Referring toFIG. 9, a cross sectional view of a touch panel according to another embodiment of the disclosure is shown. The touch panel700includes the substrate110, a plurality of touch unit regions120and two cover layers130(not illustrated). In the present embodiment, the touch unit region120and the cover layers130may be formed on the same side of the substrate110. Each touch unit region120may include the first electrode121, the second electrode122and the insulation layer124, wherein the first electrode121and the second electrode12are formed on opposite two sides of the insulation layer124to be separated by the insulation layer124for preventing from electrically short with each other. In addition, one of the cover layers130may cover the first electrode121, and another cover layer130may cover the second electrode122.

In one embodiment, the touch panel700further includes a plurality of signal traces140. A connecting relationship between the signal traces140and the touch unit regions120may be similar to the connecting relationship between the signal traces140and the touch unit regions120ofFIG. 7, and the similarity is not repeated.

Referring toFIG. 10, a cross sectional view of a touch panel according to another embodiment of the disclosure is shown. The touch panel800includes the substrate110, a plurality of touch unit regions120(not illustrated) and two cover layers130. In the present embodiment, the touch unit region120and the cover layers130may be formed on the same side of the substrate110. Each touch unit region120may include the first electrode121, the second electrode122and the insulation layer124, wherein the first electrode121and the second electrode12are formed on opposite two sides of the insulation layer124to be separated by the insulation layer124for preventing from electrically short with each other. The touch panel800and the touch panel700ofFIG. 9are different in that the second electrode122of the touch panel800may contact with the substrate110.

In one embodiment, the touch panel800may further include a plurality of signal traces140. A connecting relationship between the signal traces140and the touch unit regions120may be similar to the connecting relationship between the signal traces140and the touch unit regions120ofFIG. 7, and the similarity is not repeated.

Referring toFIG. 11, a cross sectional view of a touch panel according to another embodiment of the disclosure is shown. The touch panel900includes the substrate110, a plurality of touch unit regions120(not illustrated) and two cover layers130. In the present embodiment, the touch unit region120and the cover layers130may be formed on the same side of the substrate110. Each touch unit region120may include the first electrode121, the second electrode122and the insulation layer124, wherein the first electrode121and the second electrode12are formed on opposite two sides of the insulation layer124to be separated by the insulation layer124for preventing from electrically short with each other. The touch panel900is different from the touch panel700ofFIG. 9and the touch panel800ofFIG. 10in that the first electrode121of the touch panel900may be closer to the substrate110than the second electrode122is.

In one embodiment, the touch panel900may further include a plurality of signal traces140. A connecting relationship between the signal traces140and the touch unit regions120may be similar to the connecting relationship between the signal traces140and the touch unit regions120ofFIG. 7, and the similarity is not repeated.

Referring toFIG. 12, a cross sectional view of a touch panel according to another embodiment of the disclosure is shown. The touch panel950includes the substrate110, a plurality of touch unit regions120(not illustrated) and two cover layers130. In the present embodiment, the touch unit region120and the cover layers130may be formed on the same side of the substrate110. Each touch unit region120may include the first electrode121, the second electrode122and the insulation layer124, wherein the first electrode121and the second electrode12are formed on opposite two sides of the insulation layer124to be separated by the insulation layer124for preventing from electrically short with each other. The touch panel950is different from the touch panel900ofFIG. 11in that the first electrode121and the electrode pad123of the touch panel950may contact with the substrate110.

In one embodiment, the touch panel950may further include a plurality of signal traces140. A connecting relationship between the signal traces140and the touch unit regions120may be similar to the connecting relationship between the signal traces140and the touch unit regions120ofFIG. 7, and the similarity is not repeated.

As described above, the touch panels of the embodiments at least have the following advantages:

(1). in one embodiment, since the electrode wires may wind to form the first electrode121and/or the second electrode122, the self capacitance value of the first electrode121and/or the self capacitance value of the second electrode122may be reduced, and the allowed self capacitance increase time may be increased. As a result, the problem of the error response point may be resolved.

(2). in one embodiment, since the first electrode121and/or the second electrode122have low self capacitance values, the allowed self capacitance increase time may be increased. As a result, even though the cover lens is thinned or omitted, or the insulation layer is omitted, the self capacitance increase time after the touch is still lower than the allowed self capacitance increase time, and accordingly the problem of the error response point may be resolved.

(3). in one embodiment, the first electrode121may be shaped into wire shape and/or the second electrode122may be shaped into wire shape, and accordingly the first electrode121and/or the second electrode122may have various patterns.

(4). in one embodiment, since the first electrode121and/or the second electrode122may be shaped into wire shapes, and accordingly the design parameters of the self capacitance value of the first electrode121and/or the self capacitance value of the second electrode122may be increased through the designs of the width of the electrode, the ratio of the electrode area to the unit area of the touch unit region, the extension form of the electrode, the thickness of the electrode and/or the size of the electrode pad. As a result, the design flexibility in the first electrode121and/or the second electrode122may be increased.

It will be clear that various modifications and variations can be made to the disclosed embodiments. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.