TWI662456B - Biaxial curved touch panel and method for making same - Google Patents

Abstract

A biaxial curved touch panel includes a biaxial curved substrate, the biaxial curved substrate has a first surface and a second surface opposite to the first surface, and the first surface and the second surface The bending directions are the same, the first surface is a concave surface, and the second surface is a convex surface; at least one planar area is formed at an outer edge of the first surface. The invention also provides a method for manufacturing the biaxial curved touch panel.

Description

Biaxial curved touch panel and manufacturing method thereof

The invention relates to the field of bonding technology, and in particular, to a biaxial curved touch panel and a manufacturing method thereof.

In the conventional technology, in view of the low difficulty and high yield of the planar bonding technology, when the workpieces are bonded, the bonding area is located on the plane. Therefore, for the bonding of a biaxial curved glass cover and a flexible printed circuit board (FPC), the general bonding area can only be on a flat surface. Therefore, the current design sets the bonding area to a double The exterior of the axis curved substrate, but this way will cause the appearance of unsightly.

In addition, if the bonding area is set inside the biaxial curved substrate, a special hot-pressing cutter head is required and the phenomenon of uneven pressure will be serious. In addition, after the bonding is completed, the boundary between the FPC and the edge of the biaxial curved substrate is a curved surface. When the FPC is concavely folded, the wire on the FPC is easily broken and the reliability is poor.

An embodiment of the present invention provides a biaxial curved touch panel which is convenient for bonding. The biaxial curved touch panel includes a biaxial curved substrate having a first surface and a first surface. The first surface and the second surface opposite to each other have the same bending direction, the first surface is a concave surface, and the second surface is a convex surface; at least an outer edge of the first surface is formed. A flat area.

An embodiment of the present invention provides a method for manufacturing a biaxial curved touch panel, including the following steps: Step S1: providing a biaxial curved substrate, the biaxial curved substrate has a first surface and is opposite to the first surface The second surface, the first surface and the second surface have the same bending direction, and the first surface is concave and the second surface is convex; step S2: At least one flat area is formed at the outer edge of the first surface; step S3: forming a plurality of wires on the first surface of the biaxially curved substrate, wherein one end of each wire extends to the flat area; step S4: The planar area attaches the plurality of wires to a component to be attached.

The biaxial curved touch panel provided by the embodiment of the present invention has at least one flat area formed at the outer edge of the first surface of the biaxial curved substrate, which has a beautiful appearance and strong reliability.

100‧‧‧ dual-axis curved touch panel

10‧‧‧ Biaxial curved substrate

101‧‧‧touch area

31‧‧‧first electrode

32‧‧‧Second electrode

102‧‧‧route area

1021‧‧‧Left area

1022‧‧‧Right side

1023‧‧‧Upside

1024‧‧‧ lower side area

11‧‧‧ the first surface

12‧‧‧ second surface

13‧‧‧Plane area

15‧‧‧arc area

130‧‧‧ gap

14‧‧‧ Junction

20‧‧‧Wire

21‧‧‧first lead

22‧‧‧Second Lead

23‧‧‧ ground wire

S1-S4‧‧‧ Laminating steps

FIG. 1 is a schematic diagram of a biaxial curved touch panel according to an embodiment of the present invention.

FIG. 2 is an enlarged view of the structure at II in FIG. 1.

FIG. 3 is a schematic cross-sectional view taken along section line III-III of FIG. 1.

FIG. 4 is a flowchart of a manufacturing method of a biaxial curved touch panel according to an embodiment of the present invention.

The biaxial curved substrate according to the present invention refers to a substrate having two opposite surfaces and the two opposite surfaces are bent in the same direction, and the two opposite surfaces each have a long axis and a short axis.

FIG. 1 is a schematic diagram of a biaxial curved touch panel according to an embodiment of the present invention. As shown in FIG. 1, a biaxial curved touch panel 100 according to an embodiment of the present invention includes a biaxial curved substrate 10. The biaxial curved substrate 10 includes a first surface 11 and a second surface opposite to the first surface 11. The curved directions of the surface 12, the first surface 11, and the second surface 12 are the same (that is, curved in the same direction), wherein the first surface 11 is a concave surface, and the second surface 12 is a convex surface.

FIG. 2 is an enlarged view of the structure at II in FIG. 1. As shown in FIG. 1 and FIG. 2, at least one planar region 13 is formed at an outer edge of the first surface 11. The first surface 11 also defines a curved area 15. The curved surface region 15 of the first surface 11 refers to a region of the first surface 11 other than the planar region 13.

FIG. 3 is a schematic cross-sectional view taken along section line III-III of FIG. 1. As shown in FIGS. 1 and 3, the arc AB is an arc on the first surface 11 of the biaxial curved substrate 10 passing through the plane area 13, and the point B is located at the junction 14 between the plane area 13 and the first surface 11. Point. The straight line BC is the tangent of the arc AB at point B. The straight line BC is the same plane as the plane region 13, that is, the tangent 14 of the junction 14 between the arc region 15 of the first surface 11 and the plane region 13 is located in the same plane , So that a smooth transition is made between the planar region 13 and the curved region 15 on the first surface 11.

The flat area 13 is formed by a notch 130 formed on the first surface 11 and recessed toward the second surface 12 with respect to the first surface 11. In this embodiment, the notch 130 penetrates the outer edge of the biaxial curved substrate 10, that is, the flat area 13 communicates with the outer edge of the biaxially curved substrate 10. In other embodiments, the notch 130 may not penetrate the outer edge of the biaxially curved substrate 10, that is, the planar region 13 may not communicate with the outer edge of the biaxially curved substrate 10.

Please continue to refer to FIG. 1, the first surface 11 defines a touch area 101 and a routing area 102 surrounding the touch area 101. A plurality of wires 20 are formed in the routing area 102; one ends of the plurality of wires 20 extend to the planar area 13, respectively.

In this embodiment, the touch area 101 is provided with a plurality of first electrodes 31 and a plurality of second electrodes 32. The plurality of wires 20 includes a plurality of first wires 21 and a plurality of second wires 22, a plurality of first wires 21 and a plurality of second wires 22 Formed in the routing area 102, wherein a plurality of first wires 21 are electrically connected to the first electrode 31, and a plurality of second wires 22 are electrically connected to the second electrode 32.

Please continue to refer to FIG. 1, the touch area 101 is substantially rectangular, and the routing area 102 includes left area 1021 and right area 1022 located on the left and right sides of the touch area 101, and upper area 1023 and down located on the upper and lower sides of the touch area 101. The side region 1024 is located in the lower side region 1024. After one end of each first wire 21 is electrically connected to the first electrode 31, it extends from the left region 1021 to the plane region 13. After one end of each second wire 22 is electrically connected to the second electrode 32, it is from the right region. 1022 extends to 13 of the plane area.

The plurality of conductive lines 20 further includes a ground line 23 surrounding the touch area 101, wherein one end of the ground line 23 extends from the flat area 13 to the touch area 101 and then extends to the flat area 13 again. In this embodiment, the ground wire 23 is used for grounding to form an electrostatic discharge path and achieve the purpose of electrostatic protection.

In one embodiment, the biaxial curved touch panel 100 further includes a flexible circuit board (not shown), and the plurality of wires 20 are bonded to the flexible circuit board at the plane area 13.

In one embodiment, the plurality of first electrodes 31 and the plurality of second electrodes 32 may be single-layer self-capacitive touch electrodes. When a touch occurs, a difference occurs in the capacitive sensing signal corresponding to the touch point. The capacitive sensing signal is received and processed, and then converted to obtain the relative position of the touch point.

In another embodiment, the plurality of first electrodes 31 and the plurality of second electrodes 32 may be mutual-capacitive touch electrodes. The plurality of first electrodes 31 may be touch driving electrodes, and the plurality of second electrodes 32 may be touch sensing electrodes; or the plurality of first electrodes 31 may be touch sensing electrodes, and the plurality of second electrodes 32 may be touch driving electrodes. The plurality of first electrodes 31 and the plurality of second electrodes 32 form a mutual-capacitive touch sensing structure. When a touch occurs, the capacitive coupling between the first electrode 31 and the second electrode 32 corresponding to the vicinity of the touch point will be Affected, the sensing signal (such as voltage value) related to mutual capacitance changes, and the coordinates of each touch point can be calculated.

In this embodiment, the smooth transition between the planar region 13 and the curved surface region 15 on the first surface 11 avoids the junction of the plurality of wires 20 in the planar region 13 and the curved surface region 15 on the first surface 11. Location 14 is disconnected. The biaxially curved substrate 10 can be used as a substrate for a touch panel. The material of the biaxially curved substrate 10 is glass or plastic. In an embodiment, the material of the biaxially curved substrate 10 may be, but is not limited to, polycarbonate (PC), polymethyl methacrylate (Polymeric Methyl Methacrylate, PMMA) or polyethylene glycol terephthalate (PET), etc.

FIG. 4 is a flowchart of a manufacturing method of a biaxial curved touch panel according to an embodiment of the present invention. A method for manufacturing a biaxial curved touch panel according to an embodiment of the present invention is described below with reference to FIGS. 1 to 4.

As shown in FIG. 4, the manufacturing method of the biaxial curved touch panel 100 includes the following steps:

Step S1: Provide a biaxially curved substrate 10, and at this time, no planar region 13 is formed on the biaxially curved substrate 10.

Step S2: forming at least one planar region 13 on the outer edge of the first surface 11 of the biaxially curved substrate 10.

In an embodiment, the method for forming the planar area 13 in step S2 may be machining or compression molding on the first surface 11 by CNC (Computer Numerical Control, computer numerical control machine) to form a first surface 11 facing the first surface 11 with respect to the first surface 11. The notch 130 recessed on the two surfaces 12; the tangent of the junction 14 between the planar area 13 and the first surface 11 is located on the same plane as the planar area 13.

In an embodiment, CNC processing may be used to cut and grind the outer edge of the first surface 11 of the biaxial curved substrate 10 to form a flat area 13; or the biaxial first may be formed by compression molding. The curved substrate 10 is gradually heated to soften it, and then a pressure is applied to an outer edge of the first surface 11 of the biaxial curved substrate 10 at a predetermined temperature to deform it to form a planar region 13.

Step S3: forming a plurality of conductive lines 20 on the first surface 11 of the biaxial curved substrate 10, wherein one end of each conductive line 20 extends to the plane area 13.

Step S4: Attach the plurality of wires 20 to a component to be bonded at the plane area 13.

In an embodiment, in step S4, the component (not shown) to be bonded may be a flexible circuit board. In one embodiment, an anisotropic conductive adhesive is coated on the plane area 13 so that the anisotropic conductive adhesive covers one end of the plurality of wires 20, and then the flexible circuit board and the biaxial curved surface coated with the anisotropic conductive adhesive are coated. The base material 10 is thermocompression bonded at the flat area 13. In one embodiment, the cutting head (not shown) used in the hot-press bonding process is a flat hot-pressing head, which can avoid the uneven stress caused by the curved hot-pressing head.

The manufacturing method of the biaxial curved touch panel 100 according to an embodiment of the present invention, by forming at least one flat area 13 on the biaxial curved substrate 10 for bonding with a component to be bonded, the appearance is beautiful, High reliability, no breakage during concave folding.

The above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or equivalently replaced. Without departing from the spirit and scope of the technical solution of the present invention.

Claims (8)

An improved biaxial curved touch panel includes: a biaxial curved substrate having a first surface and a second surface opposite to the first surface, the first surface and the second surface; The second surface has the same bending direction, the first surface is concave, and the second surface is convex; and at least one flat area is formed at the outer edge of the first surface, and the arc area of the first surface and The tangent at the junction where the planar areas are connected is located in the same plane as the planar areas. The biaxial curved touch panel according to claim 1, wherein the planar area is formed by a notch formed on the first surface and recessed toward the second surface with respect to the first surface; The notch penetrates the outer edge of the biaxially curved substrate. The biaxial curved touch panel according to claim 1, wherein the first surface defines a touch area and a routing area surrounding the touch area, and the wiring area is formed with a plurality of wires; And one end of the plurality of wires extends to the planar area, respectively. The biaxial curved touch panel according to claim 3, wherein the plurality of wires include a ground wire surrounding the touch area. The biaxial curved touch panel according to claim 3, wherein the biaxial curved touch panel further includes a flexible circuit board, and the flexible circuit board is bonded to the plurality of wires in the plane area. . A method for manufacturing a biaxial curved touch panel includes the following steps: Step S1: providing a biaxial curved substrate, the biaxial curved substrate having a first surface and a second surface opposite to the first surface; The first surface and the second surface have the same bending direction, and the first surface is concave and the second surface is convex; step S2: on the outer edge of the first surface of the biaxially curved substrate At least one planar area is formed at a place, wherein the planar area is formed by processing or molding by computer numerical control (CNC) on the first surface to form a portion facing the first surface with respect to the first surface. A notch recessed on two surfaces; and a tangent at an interface where the planar area is connected to the first surface is located on the same plane as the planar area; step S3: forming a plurality of numbers on the first surface of the biaxial curved substrate Conducting wires, wherein one end of each conducting wire extends to the plane area; and step S4: attaching the plurality of conducting wires to a component to be attached in the plane area. The manufacturing method according to claim 6, wherein the step S3 includes a step of forming a ground line surrounding the touch area on the first surface of the biaxially curved substrate. The manufacturing method according to claim 6, wherein in step S4, the component to be bonded is a flexible circuit board, and the plurality of wires are connected to the flexible circuit board through an anisotropic conductive adhesive. Perform hot press bonding.