CN104731394B - Touch panel - Google Patents

Abstract

A touch panel is provided with a substrate, a touch sensing layer and a transparent cover plate. The touch sensing layer is arranged on the substrate. The transparent cover plate has different thicknesses and is arranged on the touch sensing layer. The touch sensing layer is provided with a plurality of touch units, each touch unit corresponds to the thickness of a transparent cover plate, and the area of each touch unit and the distance between the touch unit and the adjacent touch unit are set according to the corresponding thickness of the transparent cover plate.

Description

touch panel

technical field

The present invention relates to a touch panel, and in particular to a touch sensing layer structure of the touch panel.

Background technique

FIG. 1 is a schematic cross-sectional view of a capacitive touch display panel. Generally speaking, the touch display panel 100 includes a display panel (display panel) 101, a touch panel 102 disposed on the display panel, wherein the touch panel 102 includes a substrate 105, a transparent cover 103 and a touch panel. The sensing layer 104 is formed on the substrate 105 , wherein the transparent cover 103 is used to protect the touch sensing layer 104 and the display panel 101 thereunder. The touch panel 102 shown in FIG. 1 is a double-glass touch panel structure (G/G type). In another One Glass Solution (OGS) touch panel structure, the touch sensing layer 104 is directly disposed on the transparent cover 103 without the substrate 105 .

FIG. 2 shows a known capacitive touch sensing layer structure. The touch sensing layer 104: includes a plurality of first sensing units 106 arranged at intervals along the first direction and a plurality of second sensing units 107 arranged at intervals along the second direction. Adjacent first sensing units 106 are electrically connected to each other through first wires 108 to form a plurality of first sensing series arranged in parallel along the second direction, and adjacent second sensing units 107 are connected through second The wires 109 are electrically connected to each other to form a plurality of second sensing series arranged in parallel along the first direction. Wherein, the first wires 108 and the second wires 109 are interlaced and insulated from each other.

Traditionally, whether it is a double-glass touch panel structure or a single-piece glass touch panel structure, the first sensing unit 106 and the second sensing unit 107 have the same sensing area and are at the same distance from each other. distributed on the transparent cover 103 or the substrate 105 . With this touch sensing layer 104, when the transparent cover 103 is a planar substrate, since its overall thickness is uniform, the vertical distance between each sensing unit and the upper surface of the transparent cover 103 is the same. Therefore, each The same is true for the capacitance change of the sensing unit due to touch. However, when the transparent cover 103 is a curved surface or a spherically curved substrate, since its overall thickness will no longer be uniform, the vertical distance between each sensing unit and the touch surface of the transparent cover 103 will be different. The capacitance value of a sensing unit is also different, which will cause interpretation errors in the touch sensing and affect the quality of the touch sensing.

Contents of the invention

In view of the above, one of the objectives of the present invention is to provide a touch-sensing layer structure of a touch panel, which can form touch-sensing layers with different areas or different pitches according to the thickness of the cover plate.

One aspect of the present invention provides a touch panel. The touch panel has a substrate, a touch sensing layer and a transparent cover. Wherein the touch sensing layer is disposed on the substrate. The transparent cover has different thicknesses. The transparent cover has a first surface and a second surface. The first surface is a touch surface, and the touch sensing layer is arranged on the second surface. Wherein, the touch sensing layer has a plurality of touch units, each touch unit corresponds to a thickness of the transparent cover plate, and according to the thickness of the corresponding transparent cover plate, the area of each touch unit and the distance between the adjacent touch unit and the adjacent touch unit are set. spacing.

In one embodiment, the first surface of the transparent cover is a curved surface, and the transparent cover includes a symmetry axis or a symmetry center, and the curved surface is gradually curved from the symmetry axis or the symmetry center to the edge of the transparent cover .

In one embodiment, the distance between adjacent touch units is equal, and the areas of the plurality of touch units gradually change from the axis of symmetry or the center of symmetry to the periphery of the transparent cover, wherein the transparent Different thickness regions of the cover plate correspond to different areas of the touch unit. The transparent cover gradually becomes thinner or thicker from the symmetry center or the symmetry axis, and the areas of the plurality of touch units gradually become smaller or larger from the symmetry axis or the symmetry center.

In one embodiment, the areas of these touch units are equal to each other, and the distance between any two adjacent touch units gradually changes from the axis of symmetry or the center of symmetry to the periphery of the transparent cover, wherein the transparent cover The distances between adjacent touch units corresponding to different thickness regions of the board are not equal to each other. The transparent cover gradually becomes thinner or thicker from the symmetry center or the symmetry axis, and the distance between the plurality of touch units gradually decreases or increases from the symmetry axis or the symmetry center.

In one embodiment, the areas of these touch units are equal to each other, and the distance between any two adjacent touch units gradually changes from the axis of symmetry or the center of symmetry to the periphery of the transparent cover, wherein the transparent cover The distances between adjacent touch units corresponding to different thickness regions of the board are not equal to each other. The transparent cover gradually becomes thinner or thicker from the symmetry center or the symmetry axis, and the arrangement density of the plurality of touch units gradually increases or decreases from the symmetry axis or the symmetry center.

In one embodiment, the distance between adjacent touch units and the areas of the plurality of touch units gradually change from the axis of symmetry or the center of symmetry to the periphery of the transparent cover, and the transparent cover has different thicknesses. The corresponding touch units have different areas and adjacent distances. The transparent cover gradually becomes thinner or thicker from the center of symmetry or the axis of symmetry, and the areas and distances between the plurality of touch units gradually decrease or increase along the axis of symmetry or the center of symmetry.

In one embodiment, the touch panel further includes a substrate, wherein the touch sensing layer is disposed between the transparent cover and the substrate. The substrate is a flexible substrate. The second surface is a curved surface, and the curvature of the first surface is different from that of the second surface. The touch sensing layer is formed on the substrate by a roll-to-roll process. An adhesive layer is disposed between the touch sensing layer and the transparent cover.

In one embodiment, the area of each touch unit increases as the thickness of the corresponding transparent cover increases.

In one embodiment, the distance between each touch unit and adjacent touch units increases as the thickness of the corresponding transparent cover increases.

To sum up, the present invention compensates the change in the thickness of the transparent cover by changing the area of the sensing unit or the distance between the sensing units, so that the capacitance value of each sensing unit can be kept consistent, so that each touch panel can Sensitivity and resolution remain the same.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a capacitive touch display panel;

FIG. 2 shows a known capacitive touch sensing layer structure;

FIG. 3A is a schematic perspective view of a transparent cover used according to an embodiment of the present invention;

Figure 3B shows a cross-sectional illustration viewed from Figure 3AAA' line;

FIG. 3C is a cross-sectional view showing a touch sensing layer formed by a roll-to-roll process (Roll-to-Roll Process) and attached to a transparent cover according to an embodiment of the present invention;

FIG. 3D is a cross-sectional view showing a touch sensing layer formed by a roll-to-roll process (Roll-to-Roll Process) and attached to a transparent cover according to another embodiment of the present invention;

FIG. 4A is a schematic diagram of a touch sensing layer according to an embodiment of the present invention;

FIG. 4B is a schematic diagram of a touch sensing layer according to another embodiment of the present invention;

FIG. 4C is a schematic diagram of a touch sensing layer according to yet another embodiment of the present invention;

FIG. 5A is a schematic perspective view of a transparent cover used according to another embodiment of the present invention;

Figure 5B shows a cross-sectional illustration viewed from Figure 5AAA' line;

FIG. 5C is a cross-sectional view showing a touch sensing layer formed by a roll-to-roll process (Roll-to-Roll Process) and attached to a transparent cover according to yet another embodiment of the present invention;

FIG. 5D is a cross-sectional view showing a touch sensing layer formed by a roll-to-roll process (Roll-to-Roll Process) and attached to a transparent cover according to yet another embodiment of the present invention;

FIG. 6A is a schematic diagram of a touch sensing layer according to an embodiment of the present invention;

FIG. 6B is a schematic diagram of a touch sensing layer according to another embodiment of the present invention;

FIG. 6C is a schematic diagram of a touch sensing layer according to yet another embodiment of the present invention;

Fig. 7A is a cross-sectional view of a transparent cover according to an embodiment of the present invention;

FIG. 7B is a cross-sectional diagram of a transparent cover plate according to another embodiment of the present invention;

FIG. 8 is a cross-sectional view of a transparent cover plate according to yet another embodiment of the present invention;

FIG. 9 is a schematic diagram of a single-layer electrode structure according to an embodiment of the present invention.

Detailed ways

The following is a detailed description of preferred embodiments of the present invention with the accompanying drawings. The following description and drawings use the same reference numerals to indicate the same or similar elements, and repeated descriptions of the same or similar elements are omitted.

The traditional way of disposing the touch sensing layer is to adopt the sensing units with the same area, and distribute and arrange them on the transparent cover plate or the glass substrate with the same pitch. When the transparent cover is formed of a glass with different thickness (that is, the thickness is not uniform), because the vertical distance between each sensing unit and the upper surface of the transparent cover is different, different capacitance values will be formed, and in The touch sensing will cause interpretation errors and affect the quality of touch sensing. Therefore, the present invention corrects the area of each sensing unit and the distance between adjacent sensing units according to the thickness of the transparent cover to compensate the touch sensing error caused by different thicknesses of the transparent cover without redesigning the touch sensor. control sensing circuit (such as touch sensing chip, etc.). The application of the present invention will be described below by taking the transparent cover formed by curved and spherical curved substrates as an example. However, it should be noted that the present invention can also be applied to other transparent covers with different thicknesses (i.e. non-uniform thickness). middle.

FIG. 3A is a schematic perspective view of a transparent cover used according to an embodiment of the present invention. Figure 3B is a cross-sectional view viewed from line AAA' in Figure 3B. The touch panel 304 includes a transparent cover 300 and a touch sensing layer 305 . In this embodiment, the transparent cover 300 used is a one-way curved type. The visible surface or user touch surface of the transparent cover 300 is a curved surface 302 , and the part of the transparent cover 300 coupled to the touch sensing layer 305 is a plane 303 . Among them, the curved surface 302 is curved from the symmetry axis 301 in the y direction to the positive x direction and the negative x direction respectively, and its thickness decreases with the distance from the symmetry axis 301, so it is called a one-way bending type, such as the transparent cover plate 300 The part close to the axis of symmetry 301 is thicker, while the sides of the transparent cover 300 far away from the axis of symmetry 301 are thinner. . In this embodiment, the appearance of the curved surface 302 is symmetrical to the axis of symmetry 301 .

As shown in FIG. 3B , the touch panel 304 includes a transparent cover 300 and a touch sensing layer 305 . In this embodiment, the touch sensing layer 305 is directly formed on the plane 303 of the transparent cover 300 , and is a single-piece substrate (such as a single-piece glass substrate) touch panel structure. However, in other embodiments, as shown in FIG. 3C , the touch sensing layer 305 can also be formed on another substrate 306 first, and then the substrate 306 with the touch sensing layer 305 is attached to the transparent cover 300 , In this structure, the touch sensing layer 305 is disposed between the transparent cover 300 and the substrate 306, wherein both the transparent cover 300 and the substrate 306 may be glass substrates, but not limited thereto. . It should be particularly mentioned that in another embodiment, the substrate 306 shown in FIG. 3C can be a flexible film substrate, wherein the roll-to-roll process can be used to make the The control sensing layer 305 is directly formed on a bendable substrate 306, and then the bendable substrate 306 is combined (or pasted) with the transparent cover 300 to achieve mass production. Wherein, as shown in FIG. 3C , the surface of the substrate 306 formed with the touch-sensitive layer 305 can face upward, and use water glue or optical glue (not shown) to make the touch-sensitive layer and the plane 303 of the transparent cover 300 contact each other. or as shown in FIG. 3D , with the substrate 306 forming the touch sensing layer 305 facing down, using an adhesive layer (not shown), such as water glue or optical glue, to attach the film substrate 306 to the transparent cover 300 on plane 303 . However, any architecture is applicable to the present invention. In addition, in the above-mentioned embodiment, the transparent cover 300 can be made of transparent glass or transparent plastic plate, and the substrate 306 can be made of transparent glass, transparent (flexible) film or transparent plastic plate.

Among them, for the capacitive touch panel, it uses the touch point to cause capacitance change, and generates a relative induced current to detect the coordinates of the touch point. Therefore, it is related to the capacitance of the touch point, and the capacitance is directly proportional to the area of the electrode, and inversely proportional to the distance between the two electrodes. In other words, when a user touches the curved surface 302 of the transparent cover 300 with a finger, since the human body is an electrical conductor, the user's finger and the corresponding touch sensing layer 305 will form two electrodes of a capacitor, so the touch point The magnitude of the capacitance is related to the thickness of the curved surface 302 between the user's finger and the corresponding touch sensing layer 305 . Therefore, when the thickness of the transparent cover 300 between the user's finger and the corresponding touch-sensitive layer 305 is greater, the capacitance of the touch point is smaller. On the contrary, when the thickness of the transparent cover 300 between the user's finger and the corresponding touch sensing layer 305 is smaller, the capacitance of the touch point is larger. Therefore, in the present invention, by changing the area of the corresponding sensing unit in the touch sensing layer 305, or changing the distance between adjacent sensing units, or changing both the area of the sensing unit and the distance between adjacent sensing units, To compensate the capacitance difference caused by the different thickness of the transparent cover plate 300 . Among them, the decrease in capacitance caused by the increase in the thickness of the transparent cover plate 300 can be compensated by enlarging the area of the corresponding sensing unit; the increase in capacitance caused by the reduction in the thickness of the transparent cover plate 300 can be compensated by reducing the area of the corresponding sensing unit; The distance between adjacent sensing units reduces the charge attraction of adjacent sensing units to the touch, thereby increasing the capacitance at the touch to compensate for the decrease in capacitance caused by the increase in the thickness of the transparent cover 300; The distance between adjacent sensing units increases the charge attraction of the adjacent sensing units to the touch, thereby reducing the capacitance of the touch to compensate for the increase in capacitance caused by the decrease in thickness of the transparent cover 300 .

FIG. 4A is a schematic diagram of a touch sensing layer according to an embodiment of the invention. Wherein the touch sensing layer 412 includes a plurality of first sensing units 413 arranged at intervals along the x direction and a plurality of second sensing units 414 arranged at intervals along the y direction, and adjacent first sensing units 413 pass through The wires 415 are electrically connected to each other to form a plurality of first sensing series arranged in parallel along the y direction, and the adjacent second sensing units 414 are electrically connected to each other through the wire 416 to form a plurality of parallel arrays along the x direction. Arranged second sensing series. Wherein, the wires 415 and the wires 416 intersect with each other and are electrically insulated from each other. Because the curved surface 302 is curved from a symmetry axis 301 to two sides, ie to the positive x direction and the negative x direction, and its thickness gradually decreases as the distance from the symmetry axis 301 increases. Therefore, in this embodiment, the areas of the first sensing unit 413 and the second sensing unit 414 remain unchanged, but the areas of the first sensing unit 413 and the second sensing unit 414 are sequentially reduced by X along the axis of symmetry 301, that is, in the positive x direction and the negative x direction. In the direction, the distance between adjacent first sensing units 413 and the distance between adjacent second sensing units 414 are sequentially reduced. That is to say, the arrangement density of the first sensing unit 413 and the second sensing unit 414 increases as the thickness of the curved surface 302 decreases, and by changing the distance between adjacent sensing units, it affects the impact of adjacent sensing units on touch. The charge at the location is attracted, and then the capacitance change caused by the thickness change of the transparent cover 300 is compensated. In addition, in the above-mentioned embodiment, the transparent cover 300 can be made of transparent glass or transparent plastic plate, and the substrate 306 can be made of transparent glass, transparent (flexible) film or transparent plastic plate. The above-mentioned so-called distances between adjacent first sensing units 413 in the x direction gradually vary, which means that the distances between the center positions of the unit shapes of two adjacent first sensing units 413 gradually vary from each other. The distance between the two sensing units 414 in the x direction changes gradually, which means that the distances between the center positions of the unit shapes of two adjacent second sensing units 414 gradually change. In addition, it should be mentioned that in this embodiment, both the first sensing unit 513 and the second sensing unit 514 have the same shape, but other embodiments are not limited thereto.

FIG. 4B is a schematic diagram of a touch sensing layer according to another embodiment of the present invention. The touch sensing layer 512 includes a plurality of first sensing units 513 arranged at intervals along the x direction and a plurality of second sensing units 514 arranged at intervals along the y direction, and the adjacent first sensing units 513 pass through Wires 515 are electrically connected to each other to form a plurality of first sensing series arranged in parallel along the y direction, and adjacent second sensing units 514 are electrically connected to each other through wires 516 to form a plurality of parallel arrays arranged in parallel along the x direction. The second sensing series. The wires 515 and the wires 516 are intersected with each other and electrically insulated from each other. In this embodiment, the distance between adjacent first sensing units 513 in the x-direction and the distance between adjacent second sensing units 514 in the y-direction remain unchanged, but with the axis of symmetry 301 extending to both sides, That is, in the positive x direction and the negative x direction, the area of the first sensing unit 513 is sequentially reduced, and the area of the second sensing unit 514 is sequentially reduced to compensate for the capacitance caused by the gradual decrease in the thickness of the transparent cover plate 3002 rise. In addition, it should be mentioned that in this embodiment, both the first sensing unit 513 and the second sensing unit 514 have the same shape, but other embodiments are not limited thereto.

FIG. 4C is a schematic diagram of a touch sensing layer according to yet another embodiment of the present invention. Wherein the touch sensing layer 612 includes a plurality of first sensing units 613 arranged at intervals along the x direction and a plurality of second sensing units 614 arranged at intervals along the y direction, and adjacent first sensing units 613 pass through Wires 615 are electrically connected to each other to form a plurality of first sensing series arranged in parallel along the y direction, and adjacent second sensing units 614 are electrically connected to each other through wires 616 to form a plurality of parallel arrays arranged in parallel along the x direction. The second sensing series. The wires 615 and the wires 616 intersect with each other and are electrically insulated from each other. In this embodiment, the area of the first sensing unit 613 is sequentially reduced, and the area of the second sensing unit 614 is sequentially reduced along the axis of symmetry 301 to both sides, namely the positive x direction and the negative x direction, and at the same time The distance between the shape centers of the adjacent first sensing units 613 is sequentially reduced, and the distance between the shape centers of the adjacent second sensing units 614 is sequentially reduced. In this embodiment, two parameters, namely the area of the sensing unit and the distance between the shape centers of adjacent sensing units in the x direction, are used to compensate for the increase in capacitance caused by the gradual decrease in the thickness of the transparent cover 300 . Therefore, the reduction in the area of the sensing unit and the reduction in the distance between adjacent sensing units are relatively less drastic. In addition, it should be mentioned that in this embodiment, both the first sensing unit 613 and the second sensing unit 614 have the same shape, but other embodiments are not limited thereto.

FIG. 5A is a schematic perspective view of a transparent cover used according to another embodiment of the present invention. Fig. 5B is a cross-sectional diagram viewed from line AA' of Fig. 5A. The touch panel 314 includes a transparent cover 300 and a touch sensing layer 315 . In this embodiment, the transparent cover 310 used is an omnidirectional curved type. The visible surface or the user touch surface of the transparent cover 310 is divided into a spherically curved substrate 312 , and the part of the transparent cover 310 coupled to the touch sensing layer 315 is a plane 313 . Wherein, the spherically curved substrate 312 spreads out radially from a symmetrical center 311 , bends downward toward the periphery of the transparent cover 310 , and its thickness gradually decreases as the distance from the symmetrical center 311 increases.

As shown in FIG. 5B , the touch panel 314 includes a transparent cover 300 and a touch sensing layer 315 . In this embodiment, the touch sensing layer 315 is directly formed on the plane 313 of the transparent cover 310 , and is a touch panel structure of a monolithic substrate (such as a monolithic glass substrate). However, in other embodiments, as shown in FIG. 5C , the touch sensing layer 315 can also be formed on another substrate 316 first, and then this substrate with the touch sensing layer 315 is attached to the transparent cover 310 , and It is a dual-substrate touch panel structure. In this structure, the touch sensing layer 305 is disposed between the transparent cover 310 and the substrate 316, wherein the transparent cover 310 and the substrate 316 can both be glass substrates, but not limited thereto. . It should be particularly mentioned that, in another embodiment, the substrate 316 shown in FIG. The control sensing layer 315 is directly formed on the flexible substrate 316, and then the substrate 316 is combined or laminated with the transparent cover 310 to achieve the purpose of mass production. Wherein, as shown in FIG. 5C , the surface of the substrate 316 formed with the touch-sensitive layer 315 can face upward, and the touch-sensitive layer 315 can be attached to the transparent cover plate 310 by using water glue or optical glue (not shown). on the plane 313; or as shown in FIG. 5D, the substrate 316 is formed with the touch-sensitive layer 315 face down, and the substrate 316 is attached to the plane 313 of the transparent cover 310 by using water glue or optical glue (not shown in the figure). superior. However, any architecture is applicable to the present invention.

Similarly, when a capacitive touch operation is performed, due to different touch positions, the spherically curved substrate 312 provides different thicknesses, thereby resulting in different capacitance changes. Therefore, in this embodiment, by changing the area of the corresponding sensing unit in the touch sensing layer 315, or changing the distance between adjacent sensing units, or changing the area of the sensing unit and the adjacent sensing unit at the same time. The distance between the units is used to compensate the capacitance difference caused by the different thickness of the spherically curved substrate 312 .

FIG. 6A is a schematic diagram of a touch sensing layer according to an embodiment of the invention. Wherein the touch sensing layer 712 includes a plurality of first sensing units 713 arranged at intervals along the x direction and a plurality of second sensing units 714 arranged at intervals along the y direction, and adjacent first sensing units 713 pass through Wires 715 are electrically connected to each other to form a plurality of first sensing series arranged in parallel along the y direction, and adjacent second sensing units 714 are electrically connected to each other through wires 716 to form a plurality of parallel arrays arranged in parallel along the x direction. The second sensing series. The wires 715 and the wires 716 intersect with each other and are electrically insulated from each other. Because the spherically curved substrate 312 spreads radially outward from a symmetrical center 311 and gradually reduces the thickness of the spherically curved substrate 312 towards the surroundings. Therefore, in this embodiment, the areas of the first sensing unit 713 and the second sensing unit 714 remain unchanged, but they are radially expanded from the center of symmetry 311, and the space between adjacent first sensing units 713 is sequentially reduced. distance, and sequentially reduce the distance between adjacent second sensing units 714 . That is to say, the arrangement density of the first sensing units 713 and the second sensing units 714 increases as the thickness of the spherically curved substrate 312 decreases. By changing the distance between adjacent sensing units, the charge attraction of adjacent sensing units to the touch can be affected, and the increase in capacitance caused by the gradual decrease in the thickness of the spherically curved substrate 312 can be compensated. The above-mentioned so-called distances between adjacent first sensing units 713 in the x direction gradually vary, which means that the distances between the center positions of the unit shapes of two adjacent first sensing units 713 gradually change from each other. The distance between the two sensing units 714 in the y direction changes gradually, which means that the distances between the center positions of the unit shapes of two adjacent second sensing units 714 gradually change.

FIG. 6B is a schematic diagram of a touch sensing layer according to another embodiment of the present invention. Wherein the touch sensing layer 812 includes a plurality of first sensing units 813 arranged at intervals along the x direction and a plurality of second sensing units 814 arranged at intervals along the y direction, and adjacent first sensing units 813 pass through Wires 815 are electrically connected to each other to form a plurality of first sensing series arranged in parallel along the y direction, and adjacent second sensing units 814 are electrically connected to each other through wires 816 to form a plurality of parallel arrays arranged in parallel along the x direction. The second sensing series. The conductive wires 815 and the conductive wires 816 intersect with each other and are electrically insulated from each other. In this embodiment, the distance between adjacent first sensing units 813 in the x direction and the distance between adjacent second sensing units 814 in the y direction remain unchanged, but the distance between the adjacent first sensing units 813 and the distance in the y direction are sequentially reduced from the center of symmetry 311 to the outside. The area of the first sensing unit 813 and the area of the second sensing unit 814 are sequentially reduced to compensate for the increase in capacitance caused by the gradual decrease in the thickness of the spherically curved substrate 312 .

FIG. 6C is a schematic diagram of a touch sensing layer according to yet another embodiment of the present invention. Wherein the touch sensing layer 912 includes a plurality of first sensing units 913 arranged at intervals along the x direction and a plurality of second sensing units 914 arranged at intervals along the y direction, and adjacent first sensing units 913 pass through Wires 915 are electrically connected to each other to form a plurality of first sensing series arranged in parallel along the y direction, and adjacent second sensing units 914 are electrically connected to each other through wires 916 to form a plurality of parallel arrays arranged in parallel along the x direction. The second sensing series. The wire 915 and the wire 916 are insulated from each other. In this embodiment, the area of the first sensing unit 913 is sequentially reduced from the center of symmetry 311, the area of the second sensing unit 914 is sequentially reduced, and the area of the adjacent first sensing unit 913 is sequentially reduced. The distance between shape centers and the distance between shape centers of adjacent second sensing units 914 are sequentially reduced. In this embodiment, two parameters, the area of the sensing unit and the distance between the shape centers of adjacent sensing units, are used to compensate for the increase in capacitance caused by the gradual decrease in the thickness of the spherically curved substrate 312 . Therefore, the reduction in the area of the sensing unit and the reduction in the distance between adjacent sensing units are relatively less drastic.

Furthermore, the curved curvature of the transparent cover 300 with the curved surface 302 or the transparent cover 310 with the spherically curved substrate 312 is a fixed curvature. However, the sensing unit layout method of the present invention can also be applied to a transparent cover with different curvatures on the middle side of the curved surface 302 or the spherically curved substrate 312 and on both sides, as well as to the curved surface 302 or the spherically curved substrate 312 with uniform curvature everywhere. in different transparent covers. By changing the area of the sensing unit or the distance between the shape centers of the sensing units, the change in the distance from the curved surface 302 or the spherically curved substrate 312 to the touch sensing layer caused by the curvature change is compensated, that is, the transparent cover plates 300 and 310 are compensated. change in thickness.

It should be noted that, in the above-mentioned embodiment, the transparent cover plates 300 and 310 respectively include a plane 303 and 313 , and the corresponding touch sensing layers 305 and 315 are respectively attached on the plane 303 and 313 . However, in other embodiments, if the roll-to-roll process (Roll-to-Roll Process) is used to directly form the touch sensing layer 305 or 315 on a flexible film substrate, such as the substrate 306 or 316 In this case, since the substrate 306 or 316 has a bendable property, the transparent cover does not need to have a planar structure. As shown in FIG. 7A , the visible surface (or touch surface) part 702 of the transparent cover 700 can be a curved surface or a spherical curved surface, and the coupling part 703 of the transparent cover 700 coupled to the touch sensing layer 704 can also be It is a curved surface or a spherical curved surface, and its curvature is different from that of the visible surface (or touch surface). At this time, since the touch sensing layer 704 is formed on a flexible substrate 706 , the film substrate 706 can be flexed according to the appearance of the coupling portion 703 , and finally attached to the substrate 706 . Wherein, as shown in FIG. 7A , the surface of the substrate 706 forming the touch-sensitive layer 704 faces upward, and the touch-sensitive layer 704 is attached to the coupling portion 703 of the transparent cover 700 by using water glue or optical glue; or As shown in FIG. 7B , the surface of the substrate 706 forming the touch sensing layer 704 faces down, and the film substrate 706 is attached to the coupling portion 703 of the transparent cover 700 by using water glue or optical glue.

In particular, in all the above-mentioned embodiments, the transparent cover is gradually expanded and thinned by the axis of symmetry or the center of symmetry, such as a convex lens shape, such as shown in the transparent cover of Figure 4A, but the design concept of the present invention is also It can be extended and applied to a transparent cover in the shape of a concave lens. For example, as shown in FIG. 801 gradually expands to both sides and becomes larger. Similarly, other implementations can also be applied to the transparent cover 800 in the shape of a concave lens as shown in FIG. 8 , and the design method thereof can be deduced by analogy, which will not be repeated here.

In addition, the touch sensing layer in all the above-mentioned embodiments, such as the touch sensing layer 412 in FIG. It can also be extended and applied to the touch sensing layer as a single-layer electrode structure (One layer electrode or Singlelayer electrode). As shown in Figure 9, when the transparent cover is of a unidirectional bending type, that is, the transparent cover is separated from the symmetrical axis 901. It bends in the positive x and negative x directions and its thickness decreases as the distance from the symmetry axis 901 increases. At this time, the distance between the touch cells of the single-layer electrode structure can also gradually expand from the symmetry axis 901 to both sides. In addition, if other implementations of the present invention adopt a single-layer electrode structure, the design method can be deduced in the same way, and will not be repeated here.

To sum up, the touch sensing layer of the present invention has a plurality of touch units, each touch unit corresponds to a thickness of the transparent cover, and the area of the sensing unit or the distance between the sensing units can be changed according to the thickness of the corresponding transparent cover. to compensate for the thickness variation of the transparent cover, wherein the transparent cover includes at least one curved surface, and the curved surface includes an axis of symmetry or a center of symmetry, wherein the curvature of the curved surface is based on the axis of symmetry or the center of symmetry Expand. Under this method, the capacitance value of each sensing unit can be kept consistent, and the change rate of the capacitance value when a touch occurs can also be kept consistent, so that the sensitivity and resolution of each part of the touch panel can be kept the same.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Any skilled person can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be based on the scope defined by the appended claims.

Claims (14)

1. A touch panel, characterized in that, comprising: a touch sensing layer; and A transparent cover plate with different thicknesses, the transparent cover plate has a first surface and a second surface, wherein the first surface is a touch surface, and the touch sensing layer is arranged on the second surface, The first surface of the transparent cover is a curved surface, and the transparent cover includes a symmetry axis or a symmetry center, and the curved surface is gradually curved from the symmetry axis or the symmetry center to the edge of the transparent cover; Wherein, the touch sensing layer has a plurality of touch units, each of the touch units corresponds to the thickness of a transparent cover, and the distance between adjacent touch units is set according to the thickness of the corresponding transparent cover, wherein the The areas of the plurality of touch units are equal to each other, and the distance between any two adjacent touch units gradually changes from the axis of symmetry or the center of symmetry to the periphery of the transparent cover, wherein the transparent cover has different thicknesses The distances between the adjacent touch units corresponding to the regions are not equal to each other, Wherein the distance between the adjacent touch units corresponding to a first thickness region of the transparent cover is greater than the distance between adjacent touch units corresponding to a second thickness region of the transparent cover, wherein the The first thickness region is larger than the second thickness region. 2. The touch panel according to claim 1, wherein the transparent cover gradually expands and becomes thinner from the center of symmetry or the axis of symmetry, and the distance between the plurality of touch units is based on the axis of symmetry or the axis of symmetry. The center of symmetry becomes progressively smaller. 3. The touch panel according to claim 1, wherein the transparent cover gradually expands and becomes thinner from the center of symmetry or the axis of symmetry, and the arrangement density of the plurality of touch units is based on the axis of symmetry Or the center of symmetry gradually becomes larger. 4. The touch panel according to claim 1, further comprising a substrate, wherein the touch sensing layer is disposed between the transparent cover and the substrate. 5. The touch panel according to claim 4, wherein the substrate is a flexible substrate. 6. The touch panel according to claim 1, wherein the second surface is a curved surface, and the curvature of the first surface is different from that of the second surface. 7. The touch panel according to claim 4, wherein the touch sensing layer is formed on the substrate by a roll-to-roll process. 8. The touch panel according to claim 7, further comprising an adhesive layer disposed between the touch sensing layer and the transparent cover. 9. The touch panel according to claim 1, wherein the transparent cover has a symmetry axis extending in the y direction, wherein the thickness of the transparent cover extends from the symmetry axis to the positive x direction and the negative x direction respectively. The direction descends gradually and is symmetrical about the axis of symmetry. 10. The touch panel according to claim 9, wherein each of the touch units has the same area and the same shape, and is developed along the symmetrical axis in the positive x direction and the negative x direction, and along the The positive x direction and the negative x direction sequentially reduce the distance between two adjacent touch units. 11. The touch panel according to claim 1, wherein the transparent cover has a center of symmetry, and the first surface is a spherically curved surface, and the thickness of the transparent cover is gradually outward from the center of symmetry become smaller, and each of the touch units has the same area and the same shape, and radiates outward from the center of symmetry, and sequentially reduces the distance between two adjacent touch units. 12. The touch panel according to claim 1, wherein the transparent cover has a center of symmetry, and the first surface is a spherically curved surface, and the thickness of the transparent cover is gradually outward from the center of symmetry become larger, each of the touch units has the same area and shape, and radiates outward from the center of symmetry, and the distance between two adjacent touch units increases sequentially. 13. The touch panel according to claim 1, wherein the transparent cover gradually expands and becomes thicker from the center of symmetry or the axis of symmetry, and the distance between the plurality of touch units is based on the axis of symmetry or the axis of symmetry. The center of symmetry becomes progressively larger. 14. The touch panel according to claim 1, wherein the transparent cover gradually expands and becomes thicker from the center of symmetry or the axis of symmetry, and the arrangement density of the plurality of touch units is based on the axis of symmetry Or the center of symmetry gradually becomes smaller.