CN108803912A - touch panel - Google Patents

Abstract

The invention relates to a touch panel, comprising a substrate, the substrate includes a visible area and a non-visible area located on at least one side of the visible area; a touch sensing layer, the touch sensing layer includes connecting wires , a plurality of first electrodes and a plurality of discrete second electrodes, two adjacent first electrodes are electrically connected through connecting wires, and two adjacent second electrodes are electrically connected through a bridging structure; the bridging structure includes a bridging structure Wiring and insulating blocks, the adjacent second electrodes are electrically connected by jumper wires, and the insulating block is arranged between the connecting wires and the jumper wires to insulate the connecting wires and the jumper wires; the jumper wires are connected to the second electrodes A contact area is formed during connection, and the size of the contact area in the visible area changes in direct proportion to the distance from the contact area to the same edge of the touch panel in the first direction. The touch panel provided by the present invention has the characteristics of high touch sensitivity.

Description

touch panel

【Technical field】

The invention relates to a touch panel.

【Background technique】

In recent years, touch panels have been widely used in various electronic devices, such as smart phones.

A touch panel usually includes a plurality of sensing electrodes arranged in a touch array to provide touch sensing functions. There are wires connected to the edges of the sensing electrodes, and different sensing electrode signals are transmitted to different distances from the wires, resulting in different sensing Different degrees of signal attenuation occur when the electrode signal is transmitted to the wire connecting the edge of the sensing electrode, which leads to uneven touch sensitivity of the touch panel as a whole.

【Content of invention】

In order to overcome the problem of low sensitivity caused by excessive signal attenuation of the existing touch panel, the present invention provides a touch panel.

The solution of the present invention to solve the technical problem is to provide a touch panel, including: a substrate, the substrate includes a visible area and a non-visible area on at least one side of the visible area; a touch sensing layer, the The touch sensing layer is formed on the substrate; the touch sensing layer includes connecting wires, a plurality of first electrodes and a plurality of discrete second electrodes, and the first electrodes are insulated from the second electrodes, and the first electrodes are along the The first direction is extended and arranged, the second electrodes are extended and arranged along the second direction, and the first direction is perpendicular to the second direction; two adjacent first electrodes are electrically connected by connecting wires, and two adjacent second electrodes are connected by a bridge structure electrical connection; the bridging structure includes a jumper wire and an insulating block, and the adjacent second electrodes are electrically connected through a jumper wire, and the insulating block is arranged between the connecting wire and the jumper wire so that the connecting wire and the jumper wire Insulation; when the jumper is connected to the second electrode, a contact area is formed, and the area of the contact area in the visible area is proportional to the distance from the contact area to the same edge of the touch panel in the first direction Variety.

Preferably, the jumper wires obliquely cross-connect two adjacent second electrodes, and the included angle with the first direction is 12°-30°.

Preferably, there are at least two jumper wires, and adjacent jumper wires are arranged in parallel at intervals, and the distance between each other is 1.2 μm-1.5 μm.

Preferably, the connection line includes a peripheral connection line and a central connection line, the peripheral connection line connects two adjacent second electrodes in the non-visible area, and the central connection line connects two adjacent second electrodes in the visible area. two electrodes.

Preferably, the projected width of the peripheral connecting line on the substrate is 2 to 3 times the projected width of the central connecting line on the substrate.

Preferably, the jumper includes a first jumper and a plurality of second jumpers, the second jumper connects opposite ends of the first jumper, and each end of the first jumper There are at least two connected second bridging parts.

Preferably, the surface of the second bridging portion has at least one anti-reflection layer, and the anti-reflection layer is a reflective coating with low reflectivity.

Preferably, the touch panel further includes a light-shielding layer disposed between the substrate and the touch-sensitive layer to define a visible area and a non-visible area.

Preferably, the light-shielding layer is a black photoresist layer, a white photoresist layer or a material layer with low transmittance and low reflectivity, and its thickness is 1.2 μm-2.5 μm.

Preferably, the touch panel further includes an optical film disposed between the light shielding layer and the touch sensing layer, and the optical film is a brightness enhancement film or an antireflection film.

Compared with the prior art, the present invention has the following beneficial effects:

1. By contacting two adjacent second electrodes at opposite ends of each jumper in the visible area, the contact area between each jumper and the second electrode is the same as the contact area between the contact area and the touch panel The proportional change of the distance of the edge in the first direction reduces the signal attenuation of the second electrode farther away, so that the signal attenuation of the second electrode farther away when it is transmitted to the wire is the same as that of the second electrode nearer. The attenuation of the signal transmitted to the wire is consistent, and the touch sensitivity of the remote area of the touch panel is improved to ensure the consistency of the signal transmission of the touch panel, reduce the probability of reporting errors and improve the overall sensitivity of the touch panel.

2. By dividing the connecting lines into central connecting lines and peripheral connecting lines, and arranging the central connecting lines in the visible area, which has a smaller width W2, and arranging the surrounding connecting lines in the non-visual area, which has Larger width W1. The width W1 is larger than the width W2, so as to meet the transmittance requirements of the visible area VA and the non-visible area NA and suppress the generation of electrostatic discharge.

At the same time, the width W1 of the surrounding connection lines is approximately 2 to 3 times that of the central connection line, so as to suppress the electrostatic effect and maintain the sensing area and sensitivity of the touch panel.

3. By connecting the first bridging part and the second bridging part to form a height difference setting, and at the same time, the opposite ends of the first bridging part are connected with a plurality of second bridging parts, so not only can the current situation be greatly improved. There is a problem that the jumper is easy to break at the slope formed at the junction of the first jumper and the second jumper, and it can also take the role of double protection. Conduct conduction. Therefore, the jumper wire can be electrically connected to the second electrode well, and the process yield and the reliability of the touch panel are also greatly improved.

【Description of drawings】

FIG. 1A is a schematic diagram of an exploded structure of a touch panel of the present invention.

FIG. 1B is a schematic top view structure diagram of the touch panel of the present invention.

FIG. 1C is a schematic diagram of a deformed structure of the touch panel of the present invention.

FIG. 1D is a schematic diagram of another deformed structure of the touch panel of the present invention.

FIG. 1E is a schematic diagram of another deformed structure of the touch panel of the present invention.

FIG. 2A is a partial structural schematic view of the cooperation between the touch sensing layer and the wire layer of the touch panel of the present invention.

FIG. 2B is a schematic diagram of the enlarged structure at A in FIG. 2A .

Fig. 2C is a schematic diagram of the cross-sectional structure along I-I in Fig. 2A.

FIG. 2D is a schematic diagram of the cross-sectional structure along II-II in FIG. 2A .

FIG. 2E is a schematic diagram of the cross-sectional structure of FIG. 2A along III-III.

FIG. 3A is a schematic diagram of the enlarged structure at C in FIG. 2B .

FIG. 3B is a schematic diagram of the enlarged structure at D in FIG. 2B .

FIG. 4A is a schematic diagram of a contact structure between a jumper wire and a second electrode in a first state.

FIG. 4B is a schematic diagram of a contact structure between a jumper wire and a second electrode in a second state.

FIG. 4C is a schematic diagram of a contact structure between a jumper wire and a second electrode in a third state.

FIG. 4D is a schematic diagram of the contact structure between the jumper wire and the second electrode in a fourth state.

FIG. 4E is a schematic diagram of a fifth-state contact structure between a jumper wire and a second electrode.

FIG. 4F is a schematic diagram of a sixth-state contact structure between a jumper wire and a second electrode.

FIG. 4G is a schematic diagram of a seventh-state contact structure between a jumper wire and a second electrode.

FIG. 4H is a schematic diagram of the eighth state contact structure between the jumper wire and the second electrode.

FIG. 4I is a partial structural schematic diagram of the connection between the bridge structure and the second electrode.

FIG. 5A is an enlarged schematic diagram of the structure at B in FIG. 2A .

FIG. 5B is a schematic diagram of the cross-sectional structure along IV-IV in FIG. 5A .

【Detailed ways】

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to FIGS. 1A-1B , the present invention provides a touch panel 100 , which includes a substrate 110 , an optical film 160 , a light shielding layer 150 , a touch sensing layer 120 , and a wire layer 140 . The touch sensing layer 120 is formed on the substrate 110, the optical film 160 is disposed between the touch sensing layer 120 and the substrate 110, the light shielding layer 150 is disposed on the edge of the touch panel 100, and disposed on the surface of the substrate 110 at The space between the optical film 160 and the touch sensing layer 120 is used to shield other structures disposed thereunder, and defines the substrate 110 into a visible area VA and a non-visible area NA. The wire layer 140 is disposed in the non-visible area NA, and is electrically connected with the touch sensing layer 120 to transmit touch signals to a processing unit (not shown), such as an integrated circuit chip, and then calculate or identify the touch of the user's finger. control position.

Please refer to FIG. 1C , the touch panel 100 further includes a cover 180 and an optical adhesive layer 170 , the optical adhesive layer 170 is preferably OCA optical adhesive for bonding the cover 180 and the substrate 110 . The substrate 110 can be a hard substrate or a flexible substrate with better insulation resistance, specifically glass, sapphire, polyimide (PI), polypropylene (PP), polystyrene (PS), acrylonitrile-butadiene Diene-styrene (ABS), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polycarbonate (PC), polyethylene (PE), polymethyl methacrylate (PMMA) , Polytetrafluoroethylene (PTFE), etc. The thickness of the substrate 110 is 0.1-0.5 mm to ensure that the touch sensing layer 120 can be formed thereon. The thickness of the optical adhesive layer 170 is 4-6 μm to ensure sufficient adhesive strength. The cover plate 180 is preferably a glass cover plate, and its thickness is preferably 0.4-0.7 mm. While ensuring the touch panel 100 is light and thin, it also has sufficient strength and light transmittance.

The optical film 160 is disposed on the upper surface of the substrate 110 , which can be a brightness enhancement film or an anti-reflection film, and is used to increase the luminance of light or reduce reflected light to improve the visual effect. The thickness is preferably 0.1-0.2 μm.

The light-shielding layer 150 is disposed on the edge of the substrate 110. The light-shielding layer 150 can be a black photoresist layer, a white photoresist layer or other material layers with low transmittance and low reflectivity, and its thickness is preferably 1.5-2.5 μm. Since the light-shielding layer 150 is disposed on the edge of the substrate 110, when light enters the touch panel 100 from the cover plate 180, the cover plate 180, the optical adhesive layer 170, and the substrate 110 all have a certain shielding effect on the propagation of light, so the light-shielding layer 150 The thickness can be set relatively thin, which facilitates the thinning of the touch panel 100 .

Please refer to FIG. 1D , the optical film 160 is not an essential configuration, and the optical film 160 can be omitted in some embodiments.

Please refer to FIG. 1E , in some embodiments, the optical film 160 may be disposed on the touch sensing layer 120 . Alternatively, the touch panel 100 may have two layers of optical films 160 disposed between the touch-sensing layer 120 and the substrate 110 and on the touch-sensing layer 120 respectively.

Please refer to FIG. 2A , the touch sensing layer 120 includes a plurality of first electrodes 122 , at least one central connection line 124 , at least one peripheral connection line 126 and a plurality of discretely disposed second electrodes 128 . The first electrodes 122 are extended and arranged along a first direction, that is, the X-axis direction, and the second electrodes 128 are extended and arranged along a second direction, that is, the Y-axis direction. The first electrode 122 and the second electrode 128 are insulated from each other to ensure that the received touch signals do not interfere with each other. The first direction and the second direction are perpendicular to each other, that is, the arrangement directions of the first electrodes 122 and the second electrodes 128 are perpendicular to each other, but this should not limit the scope of the present invention. In some embodiments, the arrangement direction of the first electrodes 122 may not be perpendicular to the arrangement direction of the second electrodes 128 . Preferably, both the first electrode 122 and the second electrode 128 are transparent electrodes. It is made of transparent conductive material.

The central connection line 124 is disposed in the visible area VA and connects two adjacent first electrodes 122 in the visible area VA. The plurality of first electrodes 122 form a first direction electrode string in the visible area to detect touch signals in the first direction of the visible area VA. The surrounding connection line 126 is disposed in the non-visible area NA and connects two adjacent first electrodes 122 in the non-visible area NA. A plurality of first electrodes 122 form a first direction electrode string in the non-visible area NA to detect touch signals in the first direction of the non-visible area NA.

The touch panel 100 further includes a plurality of bridge structures 130A, 130B. The bridge structure 130A connects two adjacent second electrodes 128 across the central connection line 124 , and the bridge structure 130B connects two adjacent second electrodes 128 across the peripheral connection line 126 . The plurality of second electrodes 128 form a second direction electrode string to detect touch signals in the second direction.

At the same time, in order to enhance the edge touch capability of the touch panel 100, in this embodiment, at least part of the touch sensing layer 120 (such as the first electrode 122 and the second electrode 128) and the bridge structure 130B are disposed in the non-visible area NA (that is, located above the light-shielding layer 150 ), so that the touch sensing range covers to the edge of the touch panel 100 .

Please refer to FIG. 2B , the bridge structure 130A includes at least two jumper wires 132A and at least two insulating blocks 134A, and the bridge structure 130B includes at least two jumper wires 132B and at least two insulating blocks 134B. The insulating block 134A is disposed between the central connecting wire 124 and the jumper wire 132A, and the insulating block 134B is disposed between the peripheral connecting wire 126 and the jumper wire 132B, respectively for electrically isolating the jumper wire 132A from the central connecting wire 124 or the jumper wire 132B. The wire 126 is connected to the surroundings, thereby electrically isolating the first electrode 122 and the second electrode 128 .

Please refer to FIGS. 2C-2D together. Specifically, each jumper 132A includes a first jumper 1321A and a plurality of second jumper 1323A electrically connected to opposite ends of the first jumper 1321A. Preferably, each first bridging portion 1321A connects at least two second bridging portions 1323A, so that when one of the second bridging portions 1323A breaks, the other second bridging portions 1323A can work normally.

At the same time, the first jumper 1321A is arranged on a different surface from the touch sensing layer 120, so that a space is formed between the first jumper 1321A and the central connecting line 124 to accommodate the insulating block 134A, so that the bridge structure 130A and the central connecting line 124 Insulation blocks 134A of sufficient thickness are placed between them to achieve a good insulation effect. The second bridging portion 1323A connects the first bridging portion 1321A and the second electrode 128 , and after the connection, the first bridging portion 1323A and the second electrode 128 form a slope with a certain height difference.

The first bridging portion 1321A is made of a transparent conductive material, and the transparent conductive material includes: indium tin oxide, indium zinc oxide, cadmium tin oxide, aluminum zinc oxide, indium zinc tin oxide, zinc oxide, cadmium oxide, oxide Any of hafnium, graphene, silver nanowires or carbon nanotubes.

The second bridging portion 1323A is made of metal material, and the metal material includes any one of molybdenum, gold, silver, copper and aluminum, but not limited thereto. The second bridging portion 1323A has a stacked structure of multi-layer metal materials, and the surface of the second bridging portion 1323A has at least one anti-reflection layer 1324, and the material of the anti-reflection layer 1324 can be a metal material with low reflectivity (such as aluminum, chromium, etc.). and chromium oxide) and metal oxide material or any one of them, thereby reducing the light reflectivity of the second bridging portion 1323A and avoiding the visible problem of the second bridging portion 1323A. At the same time, the second bridging portion 1323A has higher conductivity than the transparent conductive material, so there is no problem of electrostatic discharge.

One end of the second bridging portions 1323A is electrically connected to the first bridging portion 1321A, the other end of the second bridging portions 1323A is electrically connected to the adjacent second electrodes 128, and any two adjacent Some second jumper parts 1323A are arranged at intervals; since there are several second jumper parts 1323A, and they are all made of metal, it can not only greatly improve the existing jumper wires between the first jumper part 1321A and the second jumper part 1323A. The problem that the slope position of the connection is easy to break can also take the effect of double protection. If one of the bridging parts breaks, it can still be conducted through the other bridging parts. Therefore, the jumper wire 132A can be electrically connected to the second electrode 128 in a good manner, and the process yield and the reliability of the touch panel are also greatly improved. Moreover, the width of the second bridging portions 1323A made of metal is smaller than that of the first bridging portion 1321A, preferably the width of the first bridging portion 1321A is at least 10 times the width of the second bridging portion 1323A, The problem of the visibility of the jumper wires as described above can thus also be effectively avoided.

Please refer to FIG. 2E , each jumper 132B includes a first jumper 1321B and a plurality of second jumper 1323B. That is, the jumper 132B and the jumper 132A have the same structure and function, which will not be repeated here.

Please refer to FIGS. 3A-3B , in some embodiments, the extending direction of the bridging structures 130A, 130B is not parallel to the arrangement direction of the second electrodes 128 , that is, the second direction, so as to reduce the visibility of the touch sensing layer 120 , but The scope of the invention should not be limited thereby. In this embodiment, the extension directions of the bridging structures 130A and 130B may be dislocated in the second direction. That is, each jumper 132A, 132B is obliquely dislocated to connect two adjacent second electrodes 128 , each insulating block 134A is placed parallel to the jumper 132A at the same angle, and each insulating block 134B is placed parallel to the jumper 132B at the same angle.

That is, the included angles between the jumper wire 132A and the jumper wire 132B and the first direction are all α1, and 30°≥α1≥12°. And two adjacent jumper wires 132A or two adjacent jumper wires 132B are arranged in parallel at intervals, and the distance between each other is 1.2 μm-1.5 μm. The width of each jumper 132A, 132B is W4, and the length is L1, wherein, 12 μm≥W4≥7 μm; 120 μm≥L1≥90 μm.

By displacing the extension direction of the bridging structures 130A and 130B in the second direction, two adjacent second electrodes 128 are connected to disperse the quantity and intensity of the reflected light of the bridging structures 130A and 130B in the same direction, reducing the bridging structure 130A , 130B are easy to be observed by human eyes due to the consistent arrangement, thereby improving the visual problem of the connecting bridge at the connection.

Each insulating block 134A, 134B is arranged parallel to each jumper wire 132A, 132B respectively. At the same time, the refractive index of the insulating blocks 134A, 134B is greater than or equal to 1.67 and less than or equal to 1.85, and the surface roughness is less than 0.7um, and the small surface roughness can effectively reduce the light scattering generated by the surface of the insulating blocks 134A, 134B. This design method reduces the quantity and intensity of light entering human eyes, so as to reduce the visibility of the touch sensing layer 120 .

By configuring the bridging structures 130A and 130B to include at least two jumpers, the jumpers of the same size are divided into multiple jumpers within the minimum width allowed by the jumpers, so that the visible interface of the jumpers is reduced, and at the same time, the at least two Connecting two adjacent second electrodes 128 obliquely and dislocated by one jumper wire can further reduce the visibility of the touch sensing layer 120 .

The two adjacent second electrodes 128 are connected by at least two jumper wires, so that the electrical connection stability of the adjacent second electrodes is stronger. Even if one of the jumper wires has a bad contact, the other jumper wire can be used normally.

Meanwhile, the peripheral connecting line 126 has a projected width W1 on the substrate 110 , and the central connecting line 124 has a projected width W2 on the substrate 110 , wherein the projected width W1 of the surrounding connecting line 126 is larger than the projected width W2 of the central connecting line 124 .

Generally speaking, the insulation resistance of the light-shielding layer 150 is lower than the insulation resistance of the substrate 110, so that the insulation resistance of the layers below the touch sensing layer 120 in the non-visible area NA is relatively low, for example, about 1011 ohms, and the visible area VA The insulation resistance of the layers below the inner touch sensing layer 120 is relatively high, for example, about 1013 ohms. Since the material resistance of the general electrode is high and the insulation resistance of the bottom layer of the touch sensing layer 120 in the non-visible area NA is low, if the transparent connection lines in the non-visible area NA are arranged in a general way, it is easy to accumulate electrostatic charges on the connection. near the line, causing electrostatic discharge problems.

Accordingly, in the embodiment of the present invention, in order to overcome the problem of electrostatic discharge that is easily encountered in the non-visible area NA when enhancing the edge touch capability, the width W1 of the surrounding connection line 126 can be configured to be greater than a certain value, thereby , reduce the impedance value between the first electrodes 122 in the non-visible area NA (that is, the impedance value of the surrounding connecting lines 126 ), prevent charges from accumulating near the surrounding connecting lines 126 , and further suppress electrostatic effects.

In this embodiment, in the configuration of the connecting lines, on the one hand, in order to avoid the reflection light in the visible area VA from affecting the user's visual effect, the central connecting line 124 is designed to have a smaller width W2, so as to reduce the weight of the bridging structure 130A. coverage area; on the other hand, because the surrounding connection lines 126 are located in the non-visible area NA, there is no need to consider the problem that the bridge structure 130B affects the visual effect. In order to reduce the impedance value of the surrounding connection lines 126, the surrounding connection lines 126 are designed to have a larger The width W1. In other words, since the visible area VA and the non-visible area NA have different requirements on the transmittance, the embodiment of the present invention tends to arrange the central connection line 124 with a smaller width in the visible area VA, while the light-shielding layer 150 is arranged in the visible area VA. In the non-visible area NA, the surrounding connection lines 126 with a larger width W1 which can suppress the electrostatic discharge are tended to be arranged. The width W1 is larger than the width W2, so as to meet the transmittance requirements of the visible area VA and the non-visible area NA and suppress the generation of electrostatic discharge.

Preferably, the width W1 of the peripheral connecting line 126 is about 2 to 3 times the width W2 of the central connecting line 124 , so as to suppress the electrostatic effect while maintaining the sensing area and sensitivity of the touch panel 100 . In addition, the width W1 of the surrounding connection lines 126 is also controlled within a range that does not affect the implementation of the rest of the subsequent processes, for example, avoiding the need to extend the length of the bridge structure 130B too much. For example, the projected width W2 of the central connection line 124 on the substrate 110 may be approximately 0.1 mm, and the projected width W1 of the peripheral connection lines 126 on the substrate 110 may be approximately 0.2 mm to 0.3 mm. In practice, the width of the central connection line 124 and the surrounding connection line 126 may vary with the square resistance of the transparent conductive material used, and this example should not limit the scope of the present invention.

Referring to FIG. 2B again, in this embodiment, the shape of the first electrode 122 and the second electrode 128 is a combination of a strip shape and a rhombus shape. In some implementations, the projected width W1 of the peripheral connection line 126 on the substrate 110 may be configured to be approximately one-third of the projected width W3 of the elongated portion 127 connecting the first electrode 122 and the peripheral connection line 126 on the substrate 110 to 1/2, so as to avoid excessive changes in the cross-sectional area, thereby preventing overheating due to excessive resistance changes when the current flows between the first electrode 122 and the surrounding connecting wires 126 . For example, the projection width W3 is 0.5 mm to 1.5 mm. The practical application should not limit the scope of the present invention. It should be understood that the shapes of the first electrode 122 and the second electrode 128 can be configured according to the actual application, and can be circular, triangular, strip-shaped, square, rhombus, or a combination of the above, and should not be limited by what is shown in the figure scope of the invention.

Referring again to FIGS. 2D-2E , in order to match the design of the width W1 of the surrounding connection lines 126 , the configurations of the second electrodes 128 and the bridge structures 130B of the touch panel 100 can be adjusted correspondingly. In detail, in the non-visible area NA, two adjacent second electrodes 128 have a peripheral pitch P1 to separate the two adjacent second electrodes 128 . In the viewing area VA, two adjacent second electrodes 128 have a central distance P2 to separate the two adjacent second electrodes 128 . The peripheral pitch P1 can be designed to be larger than the central pitch P2, so that the peripheral connecting lines 126 with larger widths can be correspondingly accommodated in the peripheral pitch P1, and the central connecting lines 124 can be correspondingly accommodated in the central pitch P2. The bridging structures 130A and 130B are respectively located in the non-visible area NA and the visible area VA, and respectively span the peripheral pitch P1 and the central pitch P2. In other words, the projected length of the bridge structure 130B located in the non-visible area NA on the substrate 110 is designed to be larger than the projected length of the bridge structure 130A located in the visible area VA on the substrate 110 . Although, the distance between the second electrode 128 and the peripheral connecting line 126 is approximately equal to the distance between the second electrode 128 and the central connecting line 124, that is, the difference between the peripheral pitch P1 and the width W1 is approximately equal to the difference between the central pitch P2 and the width W2, However, it should not limit the scope of the present invention. In some implementations, the distance between the second electrode 128 and the surrounding connection line 126 or the central connection line 124 can be designed according to actual requirements, so as to achieve a better electrostatic protection effect.

4A-4E, the opposite ends of each jumper 132A in the visual area VA are in contact with two adjacent second electrodes 128, the contact area of each jumper 132A and the contact area of the second electrode 128 The size of S is the same as the ratio of the distance from the contact area to the same edge of the touch panel in the first direction. That is, the size of the contact area is proportional to the distance from the contact area to the same edge of the touch panel in the first direction. To reduce the signal attenuation of the second electrode 128 farther away, so that the signal attenuation when the signal of the second electrode 128 farther away is transmitted to the wire layer 140 is the same as the signal attenuation when the signal of the second electrode 128 nearer is transmitted to the wire layer 140 The attenuation is consistent, and the touch sensitivity of the remote area of the touch panel is improved, so as to ensure the consistency of the signal transmission of the touch panel, reduce the probability of reporting errors and improve the overall sensitivity of the touch panel.

As shown in FIGS. 4A-4B , the change in the size of the contact area S of the contact area between each jumper 132A and the second electrode 128 can be to change the size of the projected length L of the jumper 132A in the second direction, so that the jumper 132A in The projected length L in the second direction becomes L′, where L′>L, so that the area of the contact area between the jumper wire 132A and the second electrode 128 becomes S′. In order to make the signal attenuation when the signal of the second electrode 128 farther away is transmitted to the wire layer 140 be the same as the signal attenuation when the signal of the second electrode 128 nearer is transmitted to the wire layer 140, the remote area touch control of the touch panel is improved. Sensitivity to ensure the consistency of signal transmission of the touch panel, reduce the probability of reporting errors and improve the overall sensitivity of the touch panel.

As shown in FIGS. 4C-4D , the change in the size of the contact area S of the contact area between each jumper 132A and the second electrode 128 can be to increase the size of the projected width W of the jumper 132A in the first direction, so that the jumper 132A The projected width W in the first direction becomes W′, W′>W, so that the area of the contact area between the jumper wire 132A and the second electrode 128 becomes S′. In order to make the signal attenuation when the signal of the second electrode 128 farther away is transmitted to the wire layer 140 be the same as the signal attenuation when the signal of the second electrode 128 nearer is transmitted to the wire layer 140, the remote area touch control of the touch panel is improved. Sensitivity to ensure the consistency of signal transmission of the touch panel, reduce the probability of reporting errors and improve the overall sensitivity of the touch panel.

As shown in FIGS. 4E-4F , the change in the size of the contact area S of the contact area between each jumper 132A and the second electrode 128 can be to increase the size of the projected width W of the jumper 132A in the first direction and the size of the jumper 132A in the first direction. The size of the projected length L in the second direction makes the projected width W of the jumper 132A in the first direction become W', W'>W, and the projected length L of the jumper 132A in the second direction becomes L' , L'>L makes the area of the contact area between the jumper wire 132A and the second electrode 128 become S'. In order to make the signal attenuation when the signal of the second electrode 128 farther away is transmitted to the wire layer 140 be the same as the signal attenuation when the signal of the second electrode 128 nearer is transmitted to the wire layer 140, the remote area touch control of the touch panel is improved. Sensitivity to ensure the consistency of signal transmission of the touch panel, reduce the probability of reporting errors and improve the overall sensitivity of the touch panel.

As shown in Figures 4G-4H, the change in the size of the contact area S of the contact area between each jumper 132A and the second electrode 128 can be to reduce the distance between two adjacent second electrodes 128, so that two adjacent second electrodes 128 The distance between the two electrodes 128 changes from H to H', H>H', so that the contact area between the jumper wire 132A and the second electrode 128 becomes S'. In order to make the signal attenuation when the signal of the second electrode 128 farther away is transmitted to the wire layer 140 be the same as the signal attenuation when the signal of the second electrode 128 nearer is transmitted to the wire layer 140, the remote area touch control of the touch panel is improved. Sensitivity to ensure the consistency of signal transmission of the touch panel, reduce the probability of reporting errors and improve the overall sensitivity of the touch panel.

Please refer to FIG. 4I , specifically, the contact area of a jumper wire 132A at the distance D4 from the edge of the touch panel in the first direction and the contact area of the second electrode 128 is S4; The distance between a jumper 132A at D3 in one direction and the contact area of the second electrode 128 is S3; the distance between the jumper 132A at D2 and the second electrode 128 is S3; The contact area of the contact area of the second electrode 128 is S2; the contact area of a jumper 132A at the distance D1 from the edge of the touch panel in the first direction and the contact area of the second electrode 128 is S1. Wherein S4>S3>S2>S1, D4>D3>D2>D1, and S4/D4=S3/D3=S2/D2=S1/D1.

By analogy, it can be understood that the distance between the edge of the touch panel in the first direction is DN (N is a positive integer), and the contact area of the contact area between the jumper wire 132A and the second electrode 128 is SN, SN/ The ratio of DN is constant.

This method is also applicable to two adjacent second electrodes 128 connected to the jumper wire 132B in the non-visible area, and will not be repeated here.

Please refer to FIGS. 2A and 5A together. At the junction of the visible area and the non-visible area, the wire layer 140 includes a plurality of wires 1401, and the first electrode 122 on the side of the touch sensing layer 120 is connected to the wires 1401. A zigzag shape, the end of the lead wire 1401 connected to the first electrode 122 is a second zigzag shape that matches the first zigzag shape, and there is a gap of L3 between the first zigzag shape and the second zigzag shape, preferably 40 μm≥ L3≥10μm.

The first electrode 122 on one side of the touch sensing layer 120 is connected to the lead wire 1401 through a plurality of connection bridges 142 . Each connecting bridge 142 alternately connects the first electrode 122 and the lead wire 1401 , that is, the connecting bridge 142 forms an included angle β with the second direction, and β is preferably 15°˜30°. Meanwhile, the connecting bridge 142 has a rectangular shape with a width dimension of W5 and a length dimension of L2. Preferably, 20 μm ≥ W5 ≥ 10 μm, and L2 is preferably twice the size of the gap, that is, 80 μm ≥ L2 ≥ 20 μm.

By interlacing the connection bridges 142 with the first electrodes 122 and the lead wires 1401, the number and intensity of the reflected light rays of the connection bridges 142 in the same direction are dispersed, and the problem that the connection bridges 142 are easily observed by the human eye due to the consistent arrangement of the connection bridges is reduced, and then Improvements to link bridge visibility issues at joins.

Referring to FIG. 5B , specifically, the connection bridge 142 includes a first connection portion 1421 and at least two second connection portions 1423 . The second connection part 1423 is electrically connected to the opposite ends of the first bridging part 1421, the first connection part 1421 straddles the gap, contacts the first electrode 122 and the lead wire 1401 through the second connection part 1423, and electrically connects the first electrode 122 and the lead wire 1401. An electrode 122 and a lead 1401 .

The first connecting part 1421 is made of transparent conductive material, and the transparent conductive material includes: indium tin oxide, indium zinc oxide, cadmium tin oxide, aluminum zinc oxide, indium zinc tin oxide, zinc oxide, cadmium oxide, hafnium oxide , graphene, silver nanowires or carbon nanotubes.

The second connecting portion 1423 is made of metal material, and the metal material includes any one of molybdenum, gold, silver, copper and aluminum, but not limited thereto. The second connecting part 1423 has a multi-layer metal material stack structure, and at least one anti-reflection layer 1424 is formed on its surface. The material of the anti-reflection layer 1424 can be made of low-reflectivity metal materials (such as aluminum, chromium and chromium oxide) and metal oxide materials or Any one of the methods can be implemented, thereby reducing the light reflectivity of the second connection portion 1423 and avoiding the second connection portion 1423 from being visible. At the same time, the second connecting portion 1423 has a higher conductivity than the transparent conductive material, and there is no problem of electrostatic discharge, and a plurality of connecting bridges 142 are commonly connected to the first electrode 122 and the lead 1401, and the first electrode 122 It is not easy to break the connecting bridge 142 when the lead wire 1401 passes a relatively large current, so as to improve the degree of withstand voltage.

Any two adjacent second connecting parts 1423 are arranged at intervals; since there are several second connecting parts 1423, all of which are made of metal, it can not only greatly improve the connection between the first connecting part 1421 and the second connecting part of the existing jumper wire. The problem that the position of the connection part 1423 is easy to break can also take the effect of double protection, if one of the jumper parts breaks, it can still be conducted through the other jumper parts. Therefore, the connecting bridge 142 can be electrically connected to the first electrode 122 and the lead wire 1401 , and the process yield and the reliability of the touch panel are also greatly improved. Moreover, the width of the second connecting portions 1423 made of metal is smaller than that of the first connecting portion 1421 , preferably the width of the first connecting portion 1421 is at least 10 times the width of the second connecting portion 1423 .

The first electrode 122 and the lead wire 1401 are connected through a plurality of connecting bridges 142, so that the electrical connection between the first electrode 122 and the lead wire 1401 is more firm. At the same time, the connection bridge 140 is placed obliquely, and the size is controlled within a certain range, so that the visibility of the connection bridge 142 is reduced. At the same time, by having at least one anti-reflection layer 1424 on the surface of the second connection part 1423, it has the function of reducing the second connection. The light reflectivity of the portion 1423 avoids visible problems of the second connecting portion 1423 . At the same time, the second connecting portion 1423 has higher conductivity than the transparent conductive material, so there is no problem of electrostatic discharge.

Compared with the prior art, the touch panel 100 provided by the present invention has the following advantages:

1. By contacting two adjacent second electrodes at opposite ends of each jumper in the visible area, the contact area between each jumper and the second electrode is the same as the contact area between the contact area and the touch panel The proportional change of the distance of the edge in the first direction reduces the signal attenuation of the second electrode farther away, so that the signal attenuation of the second electrode farther away when it is transmitted to the wire is the same as that of the second electrode nearer. The attenuation of the signal transmitted to the wire is consistent, and the touch sensitivity of the remote area of the touch panel is improved to ensure the consistency of the signal transmission of the touch panel, reduce the probability of reporting errors and improve the overall sensitivity of the touch panel.

2. By dividing the connecting lines into central connecting lines and peripheral connecting lines, and arranging the central connecting lines in the visible area, which has a smaller width W2, and arranging the surrounding connecting lines in the non-visual area, which has Larger width W1. The width W1 is larger than the width W2, so as to meet the transmittance requirements of the visible area VA and the non-visible area NA and suppress the generation of electrostatic discharge.

At the same time, the width W1 of the surrounding connection lines is approximately 2 to 3 times that of the central connection line, so as to suppress the electrostatic effect and maintain the sensing area and sensitivity of the touch panel.

3. By connecting the first bridging part and the second bridging part to form a height difference setting, and at the same time, the opposite ends of the first bridging part are connected with a plurality of second bridging parts, so not only can the current situation be greatly improved. There is a problem that the jumper is easy to break at the slope formed at the junction of the first jumper and the second jumper, and it can also take the role of double protection. Conduct conduction. Therefore, the jumper wire can be electrically connected to the second electrode well, and the process yield and the reliability of the touch panel are also greatly improved.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement and improvement within the principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of touch panel, which is characterized in that including：One substrate, the substrate include a visible area and are located at visible area extremely The non-visible area of few side；

One touch-control sensing layer, the touch-control sensing layer are formed on substrate；The touch-control sensing layer includes connecting line, Duo Ge One electrode and multiple discrete second electrodes, and insulate between first electrode and second electrode, first electrode is along first direction Extend arrangement, second electrode extends arrangement in a second direction, and first direction is perpendicular to second direction；Between two adjacent first electrodes It is electrically connected by connecting line, is electrically connected by bridging structure between two adjacent second electrodes；

The bridging structure includes jumper and collets, is electrically connected by jumper between the adjacent second electrode, The collets, which are set between connecting line and jumper, makes connecting line and jumper insulate；The jumper connects with second electrode Contact area is respectively formed when connecing, the size of the contact area and the contact area to touch panel phase in visible area With edge in a first direction apart from the directly proportional variation of size.

2. touch panel as described in claim 1, it is characterised in that：The jumper is oblique to be cross-linked two adjacent second electricity Pole is 12 ° -30 ° with first direction angle.

3. touch panel as claimed in claim 2, it is characterised in that：The jumper is at least two, and adjacent bridging The spaced and parallel setting of line, spacing each other is 1.2 μm -1.5 μm.

4. touch panel as described in claim 1, it is characterised in that：The connecting line includes that surrounding connecting line and center connect Line, the surrounding connecting line connect two adjacent second electrodes in non-visible area domain, and the center connecting line connects visible area Two interior adjacent second electrodes.

5. touch panel as claimed in claim 4, it is characterised in that：The surrounding connecting line is in the projection width on substrate The center connecting line is in 2 to 3 times of the projection width on the substrate.

6. touch panel as described in claim 1, it is characterised in that：The jumper includes the first bridge and multiple second Bridge, second bridge connect the opposite end of first bridge, and the first bridge is connected per one end Second bridge is at least two.

7. touch panel as claimed in claim 6, it is characterised in that：The surface of second bridge at least has an antireflection Layer, anti-reflecting layer are antiradar reflectivity reflectance coating.

8. touch panel as described in claim 1, it is characterised in that：The touch panel further includes a light shield layer, the screening Photosphere is set between substrate and touch-control sensing layer, to define visible area and non-visible area.

9. touch panel as claimed in claim 8, it is characterised in that：The light shield layer is black photoresist layer, white photoresist layer Or with low penetration rate and low reflectivity material layer, thickness is 1.2 μm -2.5 μm.

10. touch panel as claimed in claim 9, it is characterised in that：The touch panel further include be set to light shield layer and Optical film between touch-control sensing layer, the optical film are brightness enhancement film or anti-reflective film.