TW202004470A - Mutual capacitive touch panel with double-layer electrodes - Google Patents

Abstract

The present invention provides a mutual capacitive touch panel including a first electrode layer and a second electrode layer. The first electrode layer includes a plurality of electrode strings extending along a first direction. The second electrode layer includes a plurality of electrode stripes extending along a second direction, in which one of the electrode stripes include a plurality of electrode parts connected in series, one of the electrode parts includes a main part and at least branch part, the main part crosses a corresponding one of the electrode strings, the branch part is connected to a side of the main part, and no branch part exists between the branch part and the outer side of the corresponding electrode string. A spacing between a side of the branch adjacent to the outer side and the outer side is greater than twice of a width of the branch part.

Description

Mutual capacitance touch panel with double-layer electrodes

The invention relates to a mutual-capacity touch panel with double-layer electrodes, in particular to a mutual-capacity touch panel with a certain distance between the sides of the double-layer electrodes.

The touch display device composed of a display and a touch panel has been widely used in smart phones (smart phones) and satellite navigation systems (GPS navigator) because it can realize both touch and display functions and has the characteristics of human-computer interaction. system), tablet PCs, laptop PCs and other electronic products. Among them, due to the advantages of high accuracy, multi-touch, high durability, and high touch resolution, mutual-capacitive touch panels have become the mainstream touch technology currently used in the industry.

In terms of structural design, mutual capacitance touch technology can be divided into two types: single-layer electrode structure and double-layer electrode structure. Since the double-layer electrode structure is simpler in structure design and control algorithm than the single-layer electrode structure, the double-layer electrode structure is generally used in middle-to-high-end consumer electronic products. In the design of the traditional double-layer electrode structure, the induction tandem is made on a glass substrate, and the driving tandem is made on the other glass substrate. The optical substrate can be used to form The glass substrates of the driving series are attached and pasted on the display device or other electronic devices, and the sensing series and the driving series are interlaced with each other, and the sensing unit is formed at the interlace. The position of the finger can be identified by detecting the difference in capacitance before and after the finger touches or approaches the touch panel. In a conventional design, one of the glass substrates serves as an insulating layer between the driving string and the sensing string, and its thickness is at least 0.55 millimeters (mm) or more. Therefore, when the finger has not touched or approached, the background capacitance between the sensing series and the driving series is still within the allowable range required for detection.

However, as the thickness of the touch panel becomes thinner and thinner, the dielectric layer serving as the background capacitance between the driving string and the sensing string becomes thinner and thinner, so that the background capacitance is forced to increase. When the background capacitance is larger, the load effect on the same drive series is more obvious. For example, the size of the driving signal received by the sensing unit near the driving serial signal input end (near end) and the sensing unit far from the signal input end (far end) is significantly different due to the load effect, which will cause The remote sensing unit becomes smaller, which affects the detection quality of the touch panel. In addition, when the background capacitance is larger, the output of the amplifier used to amplify the sensing signal of the tandem series is easy to saturate without attenuating the driving signal, so that the difference in the capacitance sensing amount cannot be judged, thereby affecting the detection quality.

One of the objectives of the present invention is to provide a mutual-capacitive touch panel which reduces the background capacitance through the electrode width and arrangement rules of the two-layer electrode layer, thereby improving the detection quality of the capacitance variation.

An embodiment of the present invention provides a mutual-capacitive touch panel, which includes a first electrode layer, an insulating layer, and a second electrode layer. The first electrode layer includes a plurality of electrode strings, each extending along a first direction, and each electrode string has an outer side. The insulating layer is disposed on the first electrode layer. The second electrode layer is disposed on the insulating layer and includes a plurality of electrode strips, each extending along a second direction, wherein one of the electrode strips includes a plurality of electrode portions connected in series with each other, and one of the electrode portions includes A first trunk portion and at least one first branch portion, the first trunk portion extends along the second direction and spans one of the corresponding electrode strings, the first branch portion is connected to one side of the first trunk portion, And there is no branch between the first branch and the outer side. In addition, the distance between the first side and the outer side of the first branch adjacent to the outer side is greater than twice the width of the first branch.

In order to enable those skilled in the art to further understand the present invention, the embodiments of the present invention are specifically enumerated below, and the constitutional content of the present invention and the desired effects are described in detail with reference to the drawings. It should be noted that the drawings are simplified schematic diagrams. Therefore, only the components and combinations related to the present invention are shown to provide a clearer description of the basic architecture of the present invention, and the actual components and layout may be more complicated. In addition, for the convenience of explanation, the elements shown in the drawings of the present invention are not drawn in proportions such as the actual number, shape, and size, and the detailed proportions can be adjusted according to the design requirements.

Please refer to FIG. 1, which illustrates a schematic cross-sectional view of a mutual-capacitive touch panel according to a first embodiment of the present invention. The mutual-capacitive touch panel 100 is used to detect the position where the touch object touches, and includes a first electrode layer C11, a second electrode layer C12 and an insulating layer IN1, wherein the insulating layer IN1 is disposed on the first electrode layer C11, The second electrode layer C12 is disposed on the insulating layer IN1, and the first electrode layer C11 and the second electrode layer C12 can be electrically insulated from each other through the insulating layer IN1 disposed therebetween. Therefore, the first electrode layer C11, the insulating layer IN1 and the first The two-electrode layer C12 may constitute a capacitor structure, and the insulating layer IN1 serves as a dielectric layer of the capacitor structure. In some embodiments, the second electrode layer C12 is closer to the touch object for inputting commands than the first electrode layer C11. The touch object may be, for example, a finger or a stylus. The first electrode layer C11 and the second electrode layer C12 may be formed of transparent conductive materials, which may include, for example, indium tin oxide (ITO), indium zinc oxide (IZO), and antimony oxide Antimony tin oxide (ATO), antimony zinc oxide (AZO), nano silver or other suitable transparent conductive materials. The thickness of the first electrode layer C11 and the second electrode layer C12 may be less than 1 micrometer.

In this embodiment, the mutual-capacitive touch panel 100 may include a film 102, and the first electrode layer C11 and the second electrode layer C12 may be formed on the lower surface and the upper surface of the same film 102, respectively. That is, the thin film 102 may constitute an insulating layer IN1 that isolates the first electrode layer C11 and the second electrode layer C12, that is, a dielectric layer that serves as a coupling capacitor between the first electrode layer C11 and the second electrode layer C12. In this embodiment, the film 102 may be, for example, a flexible substrate, such as polyimide (PI), polyethylene terephthalate (PET), or thin glass. For example, the thickness of the thin film 102 may be 45 micrometers (μm). Therefore, compared with the conventional touch panel, the thickness of the insulating layer IN1 of the mutual capacitive touch panel 100 of this embodiment is greatly reduced. In some embodiments, the mutual-capacitive touch panel 100 may further include an adhesive layer 104 and a cover plate 106, wherein the adhesive layer 104 bonds the cover plate 106 and the second electrode layer C12 to form a mutual-capacitive touch Panel 100. In some embodiments, the mutual-capacitive touch panel 100 can be adhered to the display device 110 through an adhesive layer 108, but the invention is not limited thereto.

Please refer to FIG. 2 and FIG. 3, FIG. 2 is a schematic top view of the mutual-capacitive touch panel of the first embodiment of the present invention, and FIG. 3 is a top view of the single sensing unit of the first embodiment of the present invention Enlarge the schematic. In the mutual-capacitive touch panel 100 provided in this embodiment, the first electrode layer C11 includes a plurality of electrode strings ES1 separated and insulated from each other, each extending along a first direction D1, and the second electrode layer C12 includes A plurality of electrode strips EL1 extend along a second direction D2 and span the electrode series ES1. A plurality of sensing units SU arranged in an array can be formed through the electrode strip EL1 across the electrode series ES1 to detect the position of the touch object. In this embodiment, the electrode series ES1 can be used as a sensing electrode, and the electrode strip EL1 can be used as a driving electrode, but the present invention is not limited to this, and vice versa.

In this embodiment, each electrode series ES1 is a strip electrode, but it is not limited thereto. In some embodiments, the top-view pattern design of each electrode series ES1 can be adjusted according to actual needs. In some embodiments, each electrode series may also be formed by a plurality of electrodes and a plurality of connecting lines alternately connected in series, where each electrode corresponds to each sensing unit, but not limited to this. In this embodiment, each electrode string ES1 may have a first outer side OS1 and a second outer side OS2 that are opposite to each other and extend along the first direction D1, and a first outer side OS2 that is opposite to each other and extends along the second direction D2 The end side ESN1 and the second end side ESN2, wherein the first end side ESN1 and the second end side ESN2 are located between the first outer side OS1 and the second outer side OS2. The "outer side" and "end side" described herein mean the side of the corresponding electrode string ES1 facing outward (ie, part of the contour of the electrode string ES1 in the plan view direction V), rather than The side of the opening in the corresponding electrode series ES1. The number and shape of the outer sides of the electrode string ES1 of the present invention are not limited thereto, but can be adjusted according to the top-view outline pattern of the electrode string ES1.

In addition, each electrode strip EL1 is divided into a plurality of electrode parts EP1 connected in series, each electrode part EP1 corresponds to an electrode string ES1, and each electrode part EP1 and the corresponding electrode string ES1 form a sensing unit SU. Please refer to FIG. 3, one of the electrode portions EP1 includes a first trunk portion MP1 and at least a first branch portion BP1, wherein the first trunk portion MP1 extends along the second direction D2 and crosses the corresponding electrode string ES1, and the first branch portion BP1 is connected to one side of the first trunk portion MP1. The first branch portion BP1 has a first side S11 adjacent to the first outer side OS1, and the distance G11 between the first side S11 and the first outer side OS1 is greater than the width W1 of the first branch BP1. Times. In this embodiment, each electrode portion EP1 may include a first trunk portion MP1 and a plurality of first branch portions BP1, where each first branch portion BP1 is connected to the same side of the first trunk portion MP1. Moreover, the first branch portion BP1 having the first side S11 is the first branch portion BP1 closest to the first outer side OS1. In other words, there is no other branch between the first branch BP1 having the first side S11 and the first outer side OS1. In some embodiments, the distance G12 between two adjacent first branch portions BP1 may be greater than twice the width W1 of the first branch portion BP1. Similarly, the first branch BP1 closest to the second outer side OS2 may have another first side S12 facing the second outer side OS2, and between the first side S12 and the second outer side OS2 The pitch G13 may be greater than twice the width W1 of the first branch BP1. For example, the width W1 of the first branch portion BP1 may be less than 0.5 mm, and the gaps G11, G12, and G13 may be greater than 0.6 mm, preferably greater than 0.75 mm. In some embodiments, the width W2 of the first trunk portion MP1 may be the same as the width W1 of the first branch portion BP1, for example, less than 0.5 mm. In other embodiments, each electrode portion EP1 may only have a single first branch portion BP1.

In this embodiment, the electrode portion EP1 may optionally further include a second trunk portion MP2, adjacent to the first trunk portion MP1, and spanning the corresponding electrode series ES1. For example, the second trunk portion MP2 may be parallel to the first trunk portion MP1 and have the same width as the first trunk portion MP1, but is not limited thereto. And, the distance GM between the first trunk portion MP1 and the second trunk portion MP2 may be greater than twice the width W2 of the first trunk portion MP1 or the width W3 of the second trunk portion MP2. The first trunk portion MP1 may have the same width as the second trunk portion MP2, for example, less than 0.5mm, and the pitch GM may be greater than 0.6mm, preferably greater than 0.75mm.

Each electrode portion EP1 may optionally further include at least one second branch portion BP2 located between the first trunk portion MP1 and the second trunk portion MP2. The first branch portion BP1 is located between the first trunk portion MP1 and the second trunk portion MP2 On one side, the second branch BP2 has a second side S21 adjacent to the first outer side OS1, and the distance G21 between the second side S21 and the first outer side OS1 is greater than the width of the second branch BP2 Double W4. In this embodiment, each electrode portion EP1 may include a plurality of second branch portions BP2. For example, each second branch portion BP2 may be aligned with a corresponding first branch portion BP1 in the first direction D1. In this embodiment, the second branch BP2 having the second side S21 is the second branch BP2 closest to the first outer side OS1. In other words, there is no other branch between the second branch BP2 having the second side S21 and the first outer side OS1. In some embodiments, the distance G22 between two adjacent second branch portions BP2 may be greater than twice the width W4 of the second branch portion BP2. Similarly, the second branch BP2 closest to the second outer side OS2 may have another second side S22 facing the second outer side OS2, and between the second side S22 and the second outer side OS2 The pitch G23 may be greater than twice the width W4 of the second branch portion BP2. The width of the second branch portion BP2 may be the same as that of the first branch portion BP1. For example, when it is less than 0.5 mm, the gaps G21, G22, and G23 may be greater than 0.6 mm, preferably greater than 0.75 mm.

Each electrode portion EP1 may optionally further include at least a third branch portion BP3 located on a side of the second trunk portion MP2 relative to the first trunk portion BP1, and the third branch portion BP3 has a first branch adjacent to the first outer side OS1 The three sides S31, and the distance G31 between the third side S31 and the first outer side OS1 is greater than twice the width W5 of the third branch portion BP3. In this embodiment, each electrode portion EP1 may include a plurality of third branch portions BP3. For example, each third branch portion BP3 may be aligned with a corresponding second branch portion BP2 in the first direction D1. In this embodiment, the third branch portion BP3 having the third side S31 is the third branch portion BP3 closest to the first outer side OS1. In other words, no other branch is provided between the third branch BP3 having the third side S31 and the first outer side OS1. In some embodiments, the gap G32 between two adjacent third branch portions BP3 may be greater than twice the width W5 of the third branch portion BP3. Similarly, the third branch BP3 closest to the second outer side OS2 may have another third side S32 facing the second outer side OS2, and between the third side S32 and the second outer side OS2 The pitch G33 may be greater than twice the width W5 of the third branch portion BP3. The width of the third branch portion BP3 may be the same as that of the first branch portion BP1, for example, less than 0.5 mm, and the gaps G31, G32, and G33 may be, for example, greater than 0.6 mm, preferably greater than 0.75 mm.

Please refer to FIG. 2, in this embodiment, in the electrode strip EL1 closest to the first end side ESN1, each first branch portion BP1 located between the first trunk portion MP1 and the first end side ESN1 is The part closest to the first end side ESN1. Each first branch portion BP1 has a first end EN1, and the distance G4 between the first end EN1 and the first end side ESN1 (that is, the shortest distance between the electrode strip EL1 and the first end side ESN1) can be It is greater than twice the width W1 of the first branch portion BP1. Similarly, in the electrode strip EL1 closest to the second end side ESN2, each third branch portion BP3 located between the second trunk portion MP2 and the second end side ESN2 is the closest to the second end side ESN2 section. Each third branch portion BP3 has a second end EN2, and the distance G5 between the second end EN2 and the second end side ESN2 (that is, the shortest distance between the electrode strip EL1 and the second end side ESN2) is greater than The width W4 of the third branch portion BP3 is twice. In some embodiments, the shortest distance G6 between two adjacent electrode strips EL1 (ie, the distance between the end points of the third branch BP3 and the first branch BP1 adjacent to each other in the two adjacent electrodes EL1 ) May be larger than the width of the first branch portion BP1 or the width of the third branch portion BP3.

In this embodiment, since the electrode string ES1 does not have an opening, the pitches G11, G12, G13, G21, G22, G23, G31, G32, G33, GM, G4, G5, G6 are the electrode string ES1 in plan view The width exposed in the corresponding area in the direction V. It is worth noting that by designing the gaps G11, G12, G13, G21, G22, G23, G31, G32, G33, GM, G4, G5, G6 to be more than twice the width of the corresponding part, During operation of the touch panel 100, the number of power lines extending from the electrode strip EL1 to the electrode string ES1 is increased. For example, when the pitch G1 is less than twice the width W1 of the first branch portion BP1, when the pitch G1 is greater than twice the width W1 of the first branch portion BP1, the mutual capacitive touch panel 100 is located during operation The number of power lines between the electrode string ES1 between the first branch portion BP1 and the first outer side OS1 and the first branch portion BP1 can be increased, so when a finger approaches or touches the mutual capacitive touch panel 100 , There can be more power line changes, thereby increasing the amount of capacitance change here. Please refer to FIG. 4 and FIG. 5 for details. FIG. 4 illustrates the stacked structure formed by the first electrode layer C11, the insulating layer IN1 and the second electrode layer C12 along the section line AA′ of FIG. 2. A schematic cross-sectional view, and FIG. 5 shows a schematic diagram of the relationship between the size of the gap and the ratio of the change in capacitance. For convenience of description, FIG. 4 only shows the area corresponding to the first branch portion BP1 and the electrode strings ES1 exposed on both sides thereof, but not limited thereto. As can be seen from FIG. 4, the width of the electrode string ES1 not covered by the second electrode layer C12 is the pitch G, and the upper surface of the first branch portion BP1 is located on both sides of the first branch portion BP1 and is not the second The electrode string ES1 covered by the electrode layer C12 generates a power line EF. Moreover, since the finger approaching or touching the mutual-capacitive touch panel 100 mainly changes the power line located on the second electrode layer C12, but does not change the power line located directly under the second electrode layer C12, the power line system described here For the power line extending onto the second electrode layer C12. Since the number of power lines between the first branch portion BP1 and the electrode string ES1 depends on the pitch G and the width of the branch portion, in the fifth diagram, the width of the branch portion is 0.3 mm, and the pitches G11, G12, G13, G21 , G22, G23, G31, G32, and G33 are all the same (indicated by the pitch G) as an example, but not limited to this. Curve C shows the relationship between the measured pitch and the capacitance change ratio based on the measured capacitance change when the width of the branch is 0.3 mm and the pitch G is 2.25 mm. It can be seen from Figure 5 that when the gap G is greater than 0.6 mm, the capacitance change ratio can be greater than 80%. In particular, when the distance G is greater than 0.75mm, the capacitance change ratio can also be greater than 90%. Therefore, with the increase of the gap G, the proportion of capacitance change will also increase, which can improve the signal attenuation problem of the remote sensing unit due to the load effect to improve the detection quality.

Generally speaking, the size of the sensing unit is limited to a specific size to effectively detect the position of the finger, for example, the width of the sensing unit is limited to 4.5 mm or less. Since the increase of the gap G will limit the total side length of the electrode part in the sensing unit (that is, the sum of the side lengths), the above design and the conventional method of increasing the capacitance variation by increasing the gap G are improved by increasing the total side length of the electrode part. The concept of capacitance change is not the same and contradicts. In other words, it is not only the continuous increase of the total side length of the electrode that can effectively increase the amount of capacitance change, but also the size of the gap G (more than twice the width of the branch). Therefore, under a fixed area, the amount of capacitance change can be effectively increased by simultaneously optimizing the total side length of the electrode portion and the pitch G. In this way, in addition to the increase in the amount of capacitance change, the area of the electrode portion will not increase excessively, so that the background capacitance between the electrode string and the electrode portion can be reduced, and between the electrode portion when the finger approaches or touches The coupling capacitance of can also be reduced, so that the output of the amplifier used to amplify the sensing signal is not easily saturated without attenuating the driving signal, so as to improve the touch accuracy of the mutual capacitive touch panel 100. In this embodiment, although the thickness of the insulating layer IN1 is greatly reduced to increase the background capacitance, the above-mentioned design can increase the amount of capacitance change and reduce the background capacitance, which can improve the detection quality of the mutual capacitive touch panel 100.

The mutual-capacitive touch panel of the present invention is not limited to the above embodiment. In order to facilitate the comparison of the differences between the first embodiment and other embodiments and simplify the description, the same symbols are used to mark the same elements in other embodiments below, and are mainly directed between the first embodiment and other embodiments The differences are explained, and the repeated parts are not repeated.

Please refer to FIG. 6, which illustrates a schematic top view of a mutual-capacitive touch panel according to a second embodiment of the present invention. The difference between the mutual-capacitive touch panel 200 of this embodiment and the first embodiment is that the shape of the electrode portion EP2 of each electrode bar EL2 of this embodiment is a cross-shaped shape. Specifically, the number of the first branch portion BP1, the second branch portion BP2, and the third branch portion BP3 of the electrode portion EP2 may be two, so the first branch portion BP1, the second branch portion BP2, the third branch portion BP3, the first main body MP1 and the second main body MP2 may form a tic-tac-toe shape. In this embodiment, the spacing between the branch portion and the outer side, the spacing between two adjacent branch portions, the spacing between two adjacent trunk portions, the spacing between two adjacent electrode strips EL2, and the electrode strip The shortest distance between EL2 and the end side may be the same as the above embodiment, so it will not be repeated here.

In some embodiments, one of the electrode strings ES2 may optionally include an opening OP2 corresponding to an electrode portion EP2. For example, each electrode series ES2 may include a plurality of openings OP2, respectively corresponding to the electrode portions EP2. In addition, each opening OP2 may have the same shape as the corresponding electrode portion EP2, for example, having a cross-shaped shape, and in the plan view direction V, most of each electrode portion EP2 is located in the corresponding opening OP2. That is, through the design of the opening OP2, the overlapping area of the electrode portion EP2 and the electrode string ES2 in the plan view direction V can be reduced, and further the coupling capacitance between each electrode portion EP2 and the electrode string ES2 can be reduced. Specifically, the opening OP2 may have a first trunk opening MOP1 corresponding to the first trunk portion MP1 and a first branch opening BOP1 corresponding to the first branch portion BP1. The first trunk opening MOP1 does not penetrate the electrode series ES2. In some embodiments, the width of the first trunk opening MOP1 is greater than the width W2 of the first trunk portion MP1, and the width of the first branch opening BOP1 is greater than the width W1 of the first branch portion BP1, such that in the plan view direction V, the first Most of the trunk portion MP1 may be located in the first trunk opening MOP1, and the first branch portion BP1 may be completely located in the first trunk opening MOP1 and the first branch opening BOP1. The gap G7 between the side of the first trunk opening MOP1 and the side of the corresponding first trunk MP1 and the gap G8 between the side of the first branch opening BOP1 and the side of the corresponding first branch BP1 may be For example, considering the process error, it is substantially greater than or equal to 0.2 mm. Similarly, the opening OP2 may also have a second trunk opening MOP2 corresponding to the second trunk portion MP2, a second branch opening BOP2 corresponding to the second branch portion BP2, and a third branch opening BOP3 corresponding to the third branch portion BP3, so that the second Most of the trunk portion MP2, the second branch portion BP2, and the third branch portion BP3 may be completely located in the opening OP2 in the plan view direction V. The second trunk opening MOP2 also does not penetrate the electrode series ES2. The distance between the side of the second trunk portion MP2 and the side of the corresponding second trunk opening MOP2, the distance between the side of the second branch portion BP2 and the side of the corresponding second branch opening BOP2, and the third The distance between the side of the branch portion BP3 and the side of the corresponding third branch opening BOP2 may, for example, be substantially greater than or equal to 0.2 mm in consideration of process errors. It is worth mentioning that, because the distance between the branch and the outer side and the distance between two adjacent branches can be greater than twice the width of the branch, so in the design of the opening OP2, it is located on both sides of the branch The width of the electrode series ES2 will not be too small, so that the risk of breakage can be avoided.

It is worth noting that, since the part where the electrode string ES2 overlaps the electrode part EP2 is located directly under the electrode part EP2, the power line between the overlap part and the electrode part EP2 does not change when the finger approaches or touches, so the Except for the overlapping part of the electrode series ES2 and the electrode part EP2, the background capacitance can be effectively reduced, thereby reducing the difference between the driving signals received by the near-end and far-end sensing units, and avoiding the output of the amplifier used to amplify the sensing signal saturation. Moreover, the ratio of the capacitance change amount of each sensing unit SU to the background capacitance can also be increased, so that the detection quality of the mutual capacitance touch panel 200 can be improved. In other embodiments, the electrode portion may also be in a string shape, that is to say, the electrode portion includes only a first branch portion, a second branch portion, and a third branch portion, so that the first branch portion, the second branch The branch portion, the third branch portion, the first trunk portion, and the second trunk portion form a string shape. In this case, when the electrode string has an opening, the opening may have a string shape.

Please refer to FIG. 7, which illustrates a schematic top view of a mutual-capacitive touch panel according to a third embodiment of the present invention. The difference between the mutual-capacitive touch panel 300 of this embodiment and the second embodiment shown in FIG. 6 is that the shape of the electrode portion EP3 of this embodiment is an I-shape. Specifically, the electrode portion EP3 of this embodiment has only a single first branch portion BP13 except for the first trunk portion MP1 and the second trunk portion MP2, and is located between the first trunk portion MP1 and the second trunk portion MP2. In addition, the electrode portion EP3 does not have the second branch portion and the third branch portion. Therefore, the first trunk portion MP1, the second trunk portion MP2, and the first branch portion BP13 can form an I-shape. In some embodiments, the electrode series ES3 may also have a plurality of openings OP3 corresponding to the electrode portions EP3, and each opening OP3 may have an I-shape. In this embodiment, the spacing between the branch portion and the outer side, the spacing between two adjacent branch portions, the spacing between two adjacent trunk portions, the spacing between two adjacent electrode strips EL3, and the electrode strip The shortest distance between EL3 and the end side may be the same as the above embodiment, so it will not be repeated here. In some embodiments, the width of the trunk opening may be greater than the width of the trunk portion, and the width of the branch opening is greater than the width of the branch portion. For example, the distance between the side of the trunk opening and the side of the corresponding trunk portion and the distance between the side of the branch opening and the side of the corresponding branch portion may be substantially in consideration of process errors, for example Greater than or equal to 0.2mm.

Please refer to FIG. 8, which illustrates a schematic top view of a mutual-capacitive touch panel according to a fourth embodiment of the present invention. The difference between the mutual capacitive touch panel 400 of this embodiment and the second embodiment shown in FIG. 6 is that the shape of the electrode portion EP4 of this embodiment is a grid. Specifically, the electrode portion EP4 of this embodiment only has a single first trunk portion MP1, and the first branch portion BP1 and the second branch portion BP2 are located on both sides of the first trunk portion MP1, so there is no second trunk portion With the third branch. Therefore, the first trunk portion MP1, the first branch portion BP1, and the second branch portion BP2 can form a grid shape. In some embodiments, the electrode array ES4 may also have a plurality of openings OP4 corresponding to the electrode portions EP4, and each opening OP4 may have a grid shape. In this embodiment, the spacing between the branch portion and the outer side, the spacing between two adjacent branch portions, the spacing between two adjacent trunk portions, the spacing between two adjacent electrode strips EL4, and the electrode strip The shortest distance between EL4 and the end side may be the same as the above embodiment, so it will not be repeated here. In some embodiments, the width of the trunk opening may be greater than the width of the trunk portion, and the width of the branch opening is greater than the width of the branch portion. For example, the distance between the side of the trunk opening and the side of the corresponding trunk portion and the distance between the side of the branch opening and the side of the corresponding branch portion may be substantially in consideration of process errors, for example Greater than or equal to 0.2mm.

Please refer to FIG. 9, which illustrates a schematic top view of a mutual-capacitive touch panel according to a fifth embodiment of the present invention. The difference between the mutual-capacitive touch panel 500 of this embodiment and the fourth embodiment shown in FIG. 8 is that the shape of the electrode portion EP5 of this embodiment is a cross shape. Specifically, the electrode portion EP5 of this embodiment only has a single first branch portion BP1 and a single second branch portion BP2, so the first trunk portion MP1, the first branch portion BP1, and the second branch portion BP2 can form a grid shape. In some embodiments, the electrode array ES5 may also have a plurality of openings OP5 corresponding to the electrode portions EP5, and each opening OP5 may have a grid shape. In this embodiment, the distance between the branch portion and the outer side, the distance between two adjacent branch portions, the distance between two adjacent trunk portions, the distance between two adjacent electrode strips EL5, and the electrode strip The shortest distance between EL5 and the end side may be the same as the above embodiment, so it will not be repeated here. In some embodiments, the width of the trunk opening may be greater than the width of the trunk portion, and the width of the branch opening is greater than the width of the branch portion. For example, the distance between the side of the trunk opening and the side of the corresponding trunk portion and the distance between the side of the branch opening and the side of the corresponding branch portion may be substantially in consideration of process errors, for example Greater than or equal to 0.2mm.

Please refer to FIG. 10, which illustrates a schematic top view of a mutual-capacitive touch panel according to a sixth embodiment of the present invention. The difference between the mutual-capacitive touch panel 600 of this embodiment and the second embodiment shown in FIG. 6 is that the mutual-capacity touch panel 600 of this embodiment may be of a narrow frame type. For example, the first electrode layer C61 includes a plurality of first electrode strings ES61 separated and insulated from each other and a plurality of second electrode strings ES62 separated and insulated from each other, respectively extending along the first direction D1. In addition, each first electrode series ES61 includes a plurality of first electrodes E61 and a plurality of first connection line segments CS61, and each second electrode series ES62 includes a plurality of second electrodes E62 and a plurality of second connection line segments CS62. The first electrode E61 and the second electrode E62 are arranged in an array, and the first electrode E61 is located in an odd column, and the second electrode E62 is located in an even column. Therefore, in each row of the array, each first electrode E61 and each second electrode E62 follow The order is alternately arranged. Moreover, the first electrodes E61 in the same row are connected in series to form a first electrode series ES61 through the first connecting line segment CS61, and the second electrodes E62 in the same row are connected in series to form a second electrode series ES62 through the second connecting line segment CS62. In this embodiment, the row direction of the array may be the first direction D1, and the column direction of the array may be the second direction D2, but it is not limited thereto. In this embodiment, the electrode strip EL6 of the second electrode layer C62 includes a plurality of shielding portions SP in addition to the electrode portion EP6, and each electrode portion EP6 is located between two adjacent shielding portions SP, so that the shielding portion The SP can be located on the first connection line segment C61 and the second connection line segment CS62, thereby avoiding the generation of power lines between the electrode portion EP6 and the first connection line segment C61 and the second connection line segment CS62 to affect the touch detection position. In some embodiments, two adjacent electrode strips EL6 can be electrically connected to each other and form an electrode strip group ELM. In addition, the first electrode E61 in the same row and the second electrode E62 in the same row will overlap with two adjacent electrode strip groups ELM in the plan view direction V, and each electrode strip group ELM will overlap with the two phases in the plan view direction V. The adjacent first electrode E61 and second electrode E62 can effectively improve the touch accuracy in the first direction D1. In addition, the width of each first electrode E61 in the first row in the first direction D1 is smaller than the width of each first electrode E61 in the other row in the first direction D1, and the second electrode E62 in the last row is in the first direction The width on D1 is smaller than the width of each second electrode E62 of the other column in the first direction D1. In this embodiment, the shape of the electrode portion EP6 is a string, but it is not limited thereto. In some embodiments, the first electrode E61 and the second electrode E62 may have a serial opening OP6, and each opening OP6 corresponds to an electrode portion EP6. In other embodiments, the electrode portion EP6 may have the shape of any of the above embodiments. In other embodiments, the above spacing and opening conditions can also be applied to other touch panels with narrow bezel types. In this embodiment, the spacing between the branch portion and the outer side, the spacing between two adjacent branch portions, the spacing between two adjacent trunk portions, the spacing between two adjacent electrode strips EL6, and the electrode strip The shortest distance between EL6 and the end side may be the same as the above embodiment, so it will not be repeated here. In some embodiments, the width of the trunk opening may be greater than the width of the trunk portion, and the width of the branch opening is greater than the width of the branch portion. For example, the distance between the side of the trunk opening and the side of the corresponding trunk portion and the distance between the side of the branch opening and the side of the corresponding branch portion may be substantially in consideration of process errors, for example Greater than or equal to 0.2mm.

The stacking structure of the mutual-capacity touch panel of the present invention is not limited to this. Please refer to FIG. 11, which illustrates a schematic cross-sectional view of a mutual-capacitive touch panel according to a seventh embodiment of the present invention. The difference between the mutual-capacitive touch panel 700 provided in this embodiment and the first embodiment shown in FIG. 1 is that the mutual-capacitive touch panel 100 of this embodiment includes two films 702, 704 and an adhesive layer 706, and the first electrode layer C71 and the second electrode layer C72 can be formed on the thin films 702, 704 respectively, and the thin film 702 provided with the first electrode layer C71 and the thin film provided with the second electrode layer C72 are formed through the adhesive layer 706 704 fit. In this embodiment, the thin film 704 and the adhesive layer 706 between the first electrode layer C71 and the second electrode layer C72 constitute an insulating layer IN2 for isolating the first electrode layer C71 and the second electrode layer C72, that is, as a capacitor The dielectric layer of the structure. The thickness of the adhesive layer 706 may be, for example, 20 micrometers (μm), and the thickness of the film 704 may be, for example, 25 micrometers. In some embodiments, the stacked structure of the dielectric layer using the thin film 704 and the adhesive layer 706 as the coupling capacitor between the first electrode layer C71 and the second electrode layer C72 can also be applied to the above-described first to sixth embodiments Mutually compatible touch panel.

Please refer to FIG. 12, which is a schematic cross-sectional view of a mutual-capacitive touch panel according to an eighth embodiment of the present invention. The difference between the mutual-capacitive touch panel 800 provided in this embodiment and the first embodiment shown in FIG. 1 is that the insulating layer IN3 of this embodiment can be made of, for example, silicon oxide, silicon nitride, or other suitable Formed of insulating material. The thickness of the insulating layer IN3 may be, for example, 1.2 μm to 30 μm. Since the first electrode layer C81 and the second electrode layer C82 of this embodiment can be in contact with the lower surface and the upper surface of the insulating layer IN3, respectively, the insulating layer IN3 can be used as the space between the first electrode layer C81 and the second electrode layer C82 Dielectric layer of the coupling capacitor. Compared to the dielectric layer composed of a thin film, the thickness of the insulating layer IN3 in this embodiment can be thinner, so the distance between the second electrode layer C82 and the first electrode layer C81 can be reduced, so that the mutual interaction in this embodiment The capacitive touch panel 800 can be used as a curved type touch panel, such as a folded or curled type. In this embodiment, the mutual capacitive touch panel 800 may include a thin film 802 and a protective layer 804, and the first electrode layer C81, the insulating layer IN3, the second electrode layer C82 and the protective layer 804 are sequentially formed on the same film 802 On the first side. In another embodiment, the first electrode layer C81, the insulating layer IN3 and the second electrode layer C82 can also be directly formed on the display surface of the display device in sequence, such as a color filter substrate of an LCD display panel or an organic light-emitting display panel And the cover plate on the second electrode layer C82. In some embodiments, an insulating layer IN3 formed of silicon oxide, silicon nitride, or other suitable insulating material is used as a stack of dielectric layers for coupling capacitance between the first electrode layer C81 and the second electrode layer C82 The structure can also be applied to the mutual-capacitive touch panels of the first to sixth embodiments.

In summary, in the mutual-capacitance touch panel of the present invention, the distance between the branch portion and the outer side, the distance between two adjacent branch portions, the distance between two adjacent trunk portions, the two phases The spacing between the adjacent electrode strips and the shortest distance between the electrode strips and the end sides can be greater than twice the width of the branch or twice the width of the trunk, so that the number of power lines extending from the electrode strip to the electrode string increases, to Increase the amount of capacitance change, and relatively reduce the area of the electrode part to reduce the coupling capacitance between the finger and the electrode part. Furthermore, by providing openings in the electrode series corresponding to the electrode portions, the background capacitance of the sensing unit can be effectively reduced to reduce the difference in driving signals received by the near-end and far-end sensing units. Therefore, through this design, the output of the amplifier can avoid saturation, thereby improving the detection quality of the mutual capacitive touch panel. The above are only the preferred embodiments of the present invention, and all changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

100, 200, 300, 400, 500, 600, 700, 800 ‧‧‧ mutual compatible touch panels 102, 702, 704, 802 ‧ ‧ ‧ film 104, 108, 706 ‧ ‧ ‧ adhesive layer 106 ‧ ‧ ‧ cover Board 110‧‧‧Display device 804‧‧‧Protection layer C11, C61, C71, C81‧‧‧ First electrode layer C12, C62, C72, C82‧‧‧Second electrode layer IN1, IN2, IN3‧‧‧Insulation Layer ES1, ES2, ES3, ES4, ES5 ‧‧‧ electrode series ES61‧‧‧ first electrode series ES62‧‧‧ second electrode series EL1, EL2, EL3, EL4, EL5, EL6‧‧‧ electrode strips ELM‧‧‧electrode strip group D1‧‧‧first direction D2‧‧‧second direction V‧‧‧view direction SU‧‧‧sensor unit EP1, EP2, EP3, EP4, EP5, EP6‧‧‧ electrode part SP‧‧‧MP1‧‧‧The first trunk MP2‧‧‧‧The second trunk BP1, BP13‧‧‧The first branch BP2‧‧‧The second branch BP3‧‧‧The third branch OS1‧ ‧‧The first outer side OS2‧‧‧The second outer side ESN1‧‧‧The first end side ESN2‧‧‧The second end side S11, S12‧‧‧The first side S21, S22‧‧‧ Second side S31, S32 ‧‧‧ Third side EN1‧‧‧ First end EN2‧‧‧ Second end E61‧‧‧ First electrode E62‧‧‧Second electrode EF‧‧‧Power line CS61‧‧ ‧The first connection line CS62‧‧‧The second connection line OP2, OP3, OP4, OP5, OP6 ‧‧‧ Opening W1, W2, W3, W4, W5 ‧‧‧ Width G, G11, G12, G13, G21, G22 、G23、G31、G32、G33、GM、G4、G5、G6、G7、G8‧‧‧spacing

FIG. 1 is a schematic cross-sectional view of a mutual-capacitive touch panel according to a first embodiment of the invention. FIG. 2 is a schematic top view of the mutual-capacitive touch panel according to the first embodiment of the invention. FIG. 3 is an enlarged schematic view of a single sensing unit according to the first embodiment of the invention. FIG. 4 is a schematic cross-sectional view of the stacked structure formed by the first electrode layer, the insulating layer, and the second electrode layer along section line A-A' of FIG. 2. FIG. 5 is a schematic diagram showing the relationship between the size of the gap and the ratio of the change in capacitance. FIG. 6 is a schematic top view of a mutual-capacitive touch panel according to a second embodiment of the invention. FIG. 7 is a schematic top view of a mutual-capacitive touch panel according to a third embodiment of the invention. FIG. 8 is a schematic top view of a mutual-capacitive touch panel according to a fourth embodiment of the invention. 9 is a schematic top view of a mutual-capacitive touch panel according to a fifth embodiment of the invention. FIG. 10 is a schematic top view of a mutual-capacitive touch panel according to a sixth embodiment of the invention. 11 is a schematic cross-sectional view of a mutual-capacitive touch panel according to a seventh embodiment of the invention. FIG. 12 is a schematic cross-sectional view of a mutual-capacitive touch panel according to an eighth embodiment of the invention.

D1‧‧‧First direction

D2‧‧‧Second direction

V‧‧‧ Looking down

SU‧‧‧sensing unit

EP1‧‧‧Electrode

MP1‧‧‧The first main officer

MP2‧‧‧Second cadre

BP1‧‧‧The first branch

BP2‧‧‧Second Branch

BP3‧‧‧The third branch

OS1‧‧‧First outer side

OS2‧‧‧Second outer side

S11, S12 ‧‧‧ first side

S21, S22 ‧‧‧ second side

S31, S32 ‧‧‧ third side

G11, G12, G13, G21, G22, G23, G31, G32, G33, GM‧‧‧spacing

Claims (20)

A mutual-capacitive touch panel includes: a first electrode layer, including a plurality of electrode strings, each extending along a first direction, and each of the electrode strings has an outer side; an insulating layer is provided on On the first electrode layer; and a second electrode layer disposed on the insulating layer, the second electrode layer includes a plurality of electrode strips, each extending along a second direction, wherein one of the plurality of electrode strips A plurality of electrode portions are connected in series with each other. One of the plurality of electrode portions includes a first main portion and at least one first branch portion. The first main portion spans the corresponding plurality of electrode series One of them is that the first branch portion is connected to one side of the first trunk portion, and there is no branch portion between the first branch portion and the outer side; wherein, the first branch portion has a side adjacent to the outer side A first side, and the distance between the first side and the outer side is greater than twice the width of the first branch. The mutual-capacitive touch panel according to claim 1, wherein the one of the plurality of electrode portions includes a plurality of first branch portions, and a distance between two adjacent plurality of first branch portions is greater than the The width of the first branch is twice. The mutual-capacitive touch panel according to claim 1, wherein the one of the plurality of electrode portions includes a plurality of first branch portions, and the first branch portion closest to the outer side has the first side side. The mutual-capacitive touch panel according to claim 1, wherein the one of the plurality of electrode portions further includes at least one second branch portion connected to a side of the trunk portion relative to the at least one first branch portion . The mutual-capacitive touch panel according to claim 4, wherein the one of the plurality of electrode portions includes a plurality of second branch portions, and a distance between two adjacent plurality of second branch portions is greater than each The width of the second branch is twice. The mutual-capacitive touch panel according to claim 1, wherein the plurality of electrode portions further includes a second main portion adjacent to the first main portion, and the first main portion and the second main portion The pitch of the stems is greater than twice the width of the first stem. The mutual-capacity touch panel according to claim 6, wherein the at least one first branch portion is located between the first trunk portion and the second trunk portion. The mutual-capacitive touch panel according to claim 6, wherein the one of the plurality of electrode portions further includes at least one second branch portion located between the first trunk portion and the second trunk portion, the at least A first branch portion is located on a side of the first trunk portion relative to the second trunk portion, the second branch portion has a second side edge adjacent to the outer side edge, the second side edge and the outer side edge Is greater than twice the width of the second branch. The mutual-capacitive touch panel according to claim 8, wherein the one of the plurality of electrode portions further includes at least a third branch portion located on a side of the second trunk portion relative to the first trunk portion, The third branch has a third side adjacent to the outer side, and the distance between the third side and the outer side is greater than twice the width of the third branch. The mutual capacitance touch panel according to claim 9, wherein the one of the plurality of electrode portions includes a plurality of first branch portions, a plurality of second branch portions and a plurality of third branch portions, two adjacent The spacing between the plurality of first branch portions is greater than twice the width of each first branch portion, and the spacing between two adjacent plurality of second branch portions is greater than two widths of each second branch portion Times, and the distance between two adjacent third branches is greater than twice the width of each third branch. The mutual-capacitive touch panel according to claim 1, wherein each of the electrode strings has an end side, the one of the plurality of electrode bars is nearest to the end side of each electrode string, the first The branch portion is located between the trunk portion and the corresponding side of the electrode string, the first branch portion has one end, and the end of the first branch portion and the corresponding side edge of the electrode string The distance between them is greater than twice the width of the first branch. The mutual-capacity touch panel according to claim 1, wherein the width of the first trunk portion is the same as the width of the first branch portion. The mutual-capacitive touch panel according to claim 1, wherein the distance between the first side and the outer side is greater than 0.75 mm. The mutual-capacitance touch panel according to claim 1, wherein one of the plurality of electrode strings includes an opening corresponding to the one of the plurality of electrode portions. The mutual-capacitance touch panel of claim 14, wherein the opening has the same shape as the one of the plurality of electrode portions. The mutual-capacitive touch panel according to claim 14, wherein the opening has a first trunk opening corresponding to one of the first trunk portions and a first branch opening corresponding to one of the first branch portions, the first trunk opening has The width is greater than the width of the first trunk portion, and the width of the first branch opening is greater than the width of the first branch portion. The mutual-capacitive touch panel according to claim 1, wherein the plurality of electrode portions has a cross-shaped shape, a cross-shaped shape, an I-shaped shape, a cross shape, or a grid shape. The mutual-capacitive touch panel according to claim 1, wherein the insulating layer is a thin film, and the first electrode layer and the second electrode layer are formed on an upper surface and a lower surface of the thin film, respectively. The mutual-capacitive touch panel of claim 1, wherein the insulating layer includes an adhesive layer and a film, the thickness of the adhesive layer is substantially 20 μm, and the thickness of the film is substantially 25 μm. The mutual capacitance touch panel as claimed in claim 1, wherein the insulating layer is formed of an insulating material including silicon oxide or silicon nitride, and has a thickness between 1.2 microns and 30 microns.

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