Touch device

Abstract

The present invention relates to a touch device, including a touch unit and a flexible printed circuit board, wherein the touch unit includes a substrate, a touch sensing electrode, a touch driving electrode, and a sensing electrode lead and a driving electrode lead electrically connected to the touch sensing electrode and the touch driving electrode, respectively, wherein the touch sensing electrode and the touch driving electrode are respectively located on the first surface and the second surface opposite to each other of the substrate. The present invention is configured to include a substrate in the touch unit to include four sides and a fifth side formed by chamfering two adjacent sides, and to design a first connection portion or a second connection portion in a first flexible circuit portion in the flexible printed circuit board to be inclined at an angle to a horizontal line, and then to bind the sensing electrode lead and the driving electrode lead to the flexible printed circuit board at one of the two adjacent sides and the fifth side, so as to reduce the side edge area of ​​the conductive film occupied by the touch device when electrically connected to the flexible printed circuit board, thereby conveniently realizing a narrow frame.

Description

Technical Field

[0001] The present invention relates to the field of touch control, and in particular to a touch control device with a single substrate. Background Art

[0002] With the development of electronic technology, the touch device industry has a tendency to develop in the direction of thinness and narrow frame. At present, in order to meet the requirements of narrow frame of touch device, the touch sensing electrodes are usually located on the upper and lower surfaces of the single substrate, and the area where the touch unit and the flexible printed circuit board are connected is set on the same side of the touch unit, and is located in the middle area of ​​the side, that is, the wires electrically connected to the touch electrodes and the sensing electrodes are first connected to the same side of the touch unit, instead of setting the connection areas on two adjacent sides of the touch unit.

[0003] However, with the development of terminal products such as mobile phones and tablet computers, it is necessary to set microphones, front cameras, ambient light sensing elements, and the like on the upper and lower sides of the terminal products, and even to configure more cameras and sensors on the front panel of the terminal products to achieve front depth of field photography, video and gesture sensing to meet the development needs of future AR and gesture sensing technologies. The flexible printed circuit board that forms electrical connections for the touch device in the prior art occupies a large area on the side of the touch device and cannot meet the requirements of a narrow frame. Summary of the invention

[0004] Based on this, the present invention aims to provide a touch control device, wherein the electrical connection area between the touch control unit and the flexible printed circuit board occupies less side area of ​​the touch control device.

[0005] A touch device comprises a cover plate, a touch unit and a flexible printed circuit board, wherein the touch unit comprises a substrate, touch sensing electrodes, touch driving electrodes, sensing electrode leads and driving electrode leads electrically connected to the touch sensing electrodes and the touch driving electrodes respectively, and a flexible printed circuit board, wherein the touch sensing electrodes and the touch driving electrodes are respectively located on a first surface and a second surface opposite to each other of the substrate, wherein the substrate comprises four sides and a third side formed by chamfering two adjacent sides, wherein the sensing electrode leads and the driving electrode leads are bound to the flexible printed circuit board at one of the two adjacent sides and the fifth side.

[0006] In one embodiment, the two adjacent sides and the fifth side are arranged at the upper left corner or the lower left corner or the upper right corner or the lower right corner of the substrate.

[0007] In one embodiment, the angle between the fifth side and the horizontal side is 15 to 75 degrees, and the length of the fifth side is 5 to 15 mm.

[0008] In one embodiment, the area where the sensing electrode leads and the driving electrode leads are connected to the flexible printed circuit board is moved as a whole to the fifth side of the touch control unit.

[0009] In one embodiment, the flexible printed circuit board includes a first flexible circuit portion and a second flexible circuit portion, and is electrically connected to the sensing electrode lead and the driving electrode lead respectively. The first flexible circuit portion includes a first connecting portion and a second connecting portion, and is characterized in that the first connecting portion or the second connecting portion is designed to be inclined at an angle to a horizontal line.

[0010] In one embodiment, the angle is 15 to 75 degrees.

[0011] In one embodiment, the lengths of the first connecting portion and the second connecting portion are both 5 to 15 mm, and the length of the second flexible circuit portion is 8 to 12 mm.

[0012] In one embodiment, the fifth side is an arc segment, and the arc radius is 5 to 15 mm.

[0013] In one embodiment, the substrate is polyethylene terephthalate (PET) or cyclic olefin polymer (COP) or polycarbonate (PC) or polymethyl methacrylate (PMMA) or cyclic olefin copolymer (COC).

[0014] In one embodiment, the touch sensing electrode and the touch driving electrode are made of indium tin oxide (ITO) film material, graphene film material, carbon nanotube material, metal nanowire material or metal mesh material, wherein the metal mesh material can be made of pure metal or made of metal slurry.

[0015] The touch control device is configured to include four sides and a fifth side formed by chamfering two adjacent sides, and the first connection portion or the second connection portion in the first flexible circuit portion of the flexible printed circuit board is designed to be inclined at an angle to the horizontal line, and then the sensing electrode lead and the driving electrode lead are bound to the flexible printed circuit board at one of the two adjacent sides and the fifth side, so as to reduce the side area of ​​the conductive film occupied when the touch control device is electrically connected to the flexible printed circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of a touch control unit and a flexible printed circuit board after being bound together according to an embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the first surface structure of a touch unit provided by an embodiment of the present invention.

[0018] Figure 3It is a schematic structural diagram of the second surface of the touch unit provided by an embodiment of the present invention.

[0019] Figure 4 This is a schematic structural diagram of a first surface of a flexible printed circuit board provided by an embodiment of the present invention.

[0020] Figure 5 The diagram is a structural diagram of the second surface of a flexible printed circuit board provided by an embodiment of the present invention.

[0021] Figure 6 This is a schematic structural diagram of a first surface of a touch control unit and a flexible electric board after being bound together according to an embodiment of the present invention.

[0022] Figure 7 This is a schematic structural diagram of a second surface of a touch control unit and a flexible electric board after being bound together according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic structural diagram of a second surface of a touch unit provided by yet another embodiment of the present invention. DETAILED DESCRIPTION

[0024] The touch control device provided by the present invention can be used as a display terminal with touch interaction in the form of a mobile phone, a tablet computer, etc.

[0025] like Figure 1 As shown, the touch control unit in the touch control device of the present invention includes a substrate 10, touch sensing electrodes 11, touch driving electrodes 12, sensing electrode leads and driving electrode leads 121. The sensing electrode leads are electrically connected to the touch sensing electrodes 11 and are arranged on the first surface of the substrate 10, wherein the sensing electrode leads include left sensing electrode leads 111 and right sensing electrode leads 112; and the driving electrode leads 121 are electrically connected to the touch driving electrodes 12 and are arranged on the second surface of the substrate 10. The touch sensing unit is used to sense touch information by arranging the touch sensing electrodes 11, the touch driving electrodes 12, the sensing electrode leads 111 (and 112) and the driving electrode leads 121.

[0026] like Figure 2 and Figure 3 As shown, the substrate in the touch unit of the present invention includes four sides and a fifth side formed by chamfering two adjacent sides, as shown at the lower right corner position A in the figure. In some other embodiments, the touch device can also be designed to include a fifth side formed by chamfering two adjacent sides at the upper right corner or the lower left corner or the upper left corner, which can be flexibly selected according to actual production needs, reducing process difficulty and saving production costs.

[0027] In some embodiments of the present invention, the angle between the fifth side and its adjacent horizontal side is 15 to 75 degrees, and the length of the fifth side is 5 to 15 mm. This arrangement can fully utilize the bottom corner space of the substrate for binding, and can also avoid malfunction during subsequent binding.

[0028] In some embodiments of the present invention, the areas where the sensing electrode leads 111, 112 and the driving electrode leads 121 are connected to the flexible printed circuit board 20 are moved toward the fifth edge direction of the touch unit as a whole. In this way, the frame routing and binding positions can occupy the corresponding bottom corner space as much as possible, providing favorable conditions for the subsequent realization of a narrow frame.

[0029] The present invention designs a fifth side formed by chamfering two adjacent sides at one of the four bottom corners of the touch unit, and at the same time distributes a portion of the sensing electrode leads 111 (or 112) and the driving electrode leads 121 on the touch unit that are coupled to the touch sensing electrode 11 or the touch driving electrode 12 in the binding position area between one of the two adjacent sides and the fifth side; at the same time, the area where the sensing electrode leads 111, 112 and the driving electrode leads 121 are bound and connected to the flexible printed circuit board 20 is moved as a whole to the position of the fifth side of the touch unit, so that the flexible printed circuit board 20 can be increased. The binding area with the electrode leads can reduce the difficulty of the binding process and avoid damage caused by the hot pressing process when the sensing electrode leads 111, 112 and the driving electrode leads 121 are bound to the upper and lower surfaces of the substrate; on the other hand, it can effectively reduce the space occupied by the binding connection area of ​​the touch unit and the flexible printed circuit board 20 in the entire touch unit, especially reducing the lateral space occupied by the sensing electrode leads and the driving electrode leads on the lower side of the touch unit and the lateral space occupied by the binding connection area of ​​the touch unit and the flexible printed circuit board 20 on the lower side of the touch unit, which is beneficial to the subsequent narrow frame design.

[0030] like Figure 4 and Figure 5 As shown, the flexible printed circuit board 20 of the present invention is used in conjunction with the aforementioned touch control unit. The flexible printed circuit board 20 includes a first flexible circuit portion 21 and a second flexible circuit portion 22, wherein the first flexible circuit portion 21 includes a first connecting portion 211 and a second connecting portion 212; the first connecting portion 211, the second flexible circuit portion 22 and the second connecting portion 212 are arranged in sequence from left to right. The first flexible circuit portion 21 is electrically connected to the sensing electrode lead 111 (or 112), and the second flexible circuit portion 22 is electrically connected to the driving electrode lead 121. In addition, the flexible printed circuit board 20 includes a connecting gold finger 24, which is arranged on the same surface of the flexible printed circuit board 20 as the first binding gold finger 21a and the second binding gold finger 21b, and is located at the other end of the surface, for connecting to an external control circuit.

[0031] More specifically, if Figure 4 to Figure 7 As shown, the first connection part 211 is provided with a first binding gold finger 21a, and the first connection part 211 is bound and connected to the left sensing electrode lead 111 through the first binding gold finger 21a; the second connection part 212 is provided with a second binding gold finger 21b, and the second connection part 212 is bound and connected to the right sensing electrode lead 112 through the second binding gold finger 21b, and the second flexible circuit part 22 is provided with a third binding gold finger 22c for binding and electrically connecting with the driving electrode lead 121.

[0032] The first connection portion 211 or the second connection portion 212 in the flexible printed circuit board 20 of the present invention is designed to form an inclined angle with the horizontal line. In some embodiments, the angle formed by the first connection portion 211 or the second connection portion 212 and the horizontal line is 15 to 75 degrees. In some other embodiments, the lengths of the first connection portion 211 and the second connection portion 212 are both 5 to 15 mm, and the length of the second flexible circuit portion 22 is 8 to 12 mm. Such a configuration can not only ensure a better binding connection between the flexible printed circuit board 20 and the touch unit designed with different side binding positions, but also enable the area where the sensing electrode leads 111, 112 and the driving electrode leads 121 are connected to the flexible printed circuit board 20 to move as a whole to the different side binding positions of the touch unit, thereby effectively reducing the space occupied by the binding connection area between the touch unit and the flexible printed circuit board 20 in the entire touch unit, which is beneficial to the subsequent narrow frame design.

[0033] In some other embodiments of the present invention, the position of the fifth side of the bottom corner of the touch unit is designed to be an arc segment. Figure 8As shown, the lower right corner B of the touch unit is designed with an arc. The arc is connected to the right side and the lower side of the touch device, and the radius of the arc is 5 to 15 mm. The flexible printed circuit board 20 used in conjunction with the touch unit in this embodiment is also designed accordingly, that is, the first connection part 211 or the second connection part 212 in the first flexible circuit part 21 of the flexible electrode plate 20 is also designed as an arc design, and the radius of the arc is 5 to 15 mm, so as to facilitate the use of the touch unit. Such arrangement, on the one hand, can increase the area of ​​the binding region between the flexible printed circuit board 20 and the electrode leads, reduce the difficulty of the binding process, and avoid damage caused by the hot pressing process when the sensing electrode leads 111, 112 and the driving electrode leads 121 are bound to the upper and lower surfaces directly opposite to the substrate; on the other hand, the area where the sensing electrode leads 111, 112 and the driving electrode leads 121 are bound and connected to the flexible printed circuit board 20 can be moved as a whole to the binding positions on different sides of the touch unit, so that the space occupied by the binding and connection area between the touch unit and the flexible printed circuit board 20 in the entire touch unit can be effectively reduced, which is beneficial to the subsequent narrow frame design.

[0034] The substrate 10 of the touch unit in the present invention can be a transparent substrate such as a PET substrate or a COP substrate or a glass or a PMMA substrate or a PE substrate or a PC substrate. The touch sensing electrodes 11 and the touch driving electrodes 12 shown in the drawings of the present invention are in the shape of long strips. In other embodiments of the present invention, the shapes of the touch sensing electrodes 11 and the touch driving electrodes 12 can also be other regular or irregular shapes, and can also be designed according to actual needs. The touch sensing electrodes and touch driving electrodes in the present invention can be made of ITO film materials, graphene film materials and carbon nanotube materials through etching processes or coating processes or laser processes; they can also be made by forming grooves through thermal transfer, and then filling the grooves with metal grid materials formed by nanosilver; they can also be made of conductive plating through a yellow light process.

[0035] The "upper" and "lower" mentioned in the present invention refer to the degree of proximity of the touch display device to the user during use. The side relatively close to the user is "upper" and the side relatively far from the user is "lower". For example, the lower surface of the protective cover refers to the side of the protective cover far from the user.

[0036] In the present invention, the substrate in the touch control unit is configured to include four sides and a fifth side formed by chamfering two adjacent sides, and the first connecting portion or the second connecting portion in the first flexible circuit portion of the flexible printed circuit board is designed to be inclined at an angle to the horizontal line, and then the sensing electrode lead and the driving electrode lead are bound to the flexible printed circuit board at one of the two adjacent sides and the fifth side. On the one hand, the binding area of ​​the flexible printed circuit board 20 and the electrode lead can be increased, and the difficulty of the binding process can be reduced. In addition, the sensing electrode leads 111, 112 and the driving electrode leads 121 can be prevented from being damaged when the upper and lower surfaces of the substrate are bound. On the other hand, it can effectively reduce the space occupied by the binding connection area between the touch unit and the flexible printed circuit board 20 in the entire touch unit, especially reduce the lateral space occupied by the sensing electrode leads and the driving electrode leads on the lower side of the touch unit and the lateral space occupied by the binding connection area between the touch unit and the flexible printed circuit board 20 on the lower side of the touch unit, which is beneficial to the subsequent narrow frame design and can save more space so that more cameras and sensors can be configured on the front panel of the terminal product to realize front-end depth of field photography, video and gesture sensing to meet the development needs of future AR and gesture sensing technology.

[0037] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A touch device, comprising a touch unit and a flexible printed circuit board, wherein the touch unit comprises a substrate, touch sensing electrodes, touch driving electrodes, and sensing electrode leads and driving electrode leads electrically connected to the touch sensing electrodes and the touch driving electrodes, respectively, wherein the touch sensing electrodes and the touch driving electrodes are respectively located on a first surface and a second surface opposite to each other of the substrate, characterized in that: The substrate comprises four sides and a fifth side formed by chamfering two adjacent sides, and the sensing electrode leads and the driving electrode leads are bound to the flexible printed circuit board at one of the two adjacent sides and the fifth side; The flexible printed circuit board includes a first flexible circuit portion and a second flexible circuit portion, the first flexible circuit portion includes a first connecting portion and a second connecting portion, the first connecting portion, the second flexible circuit portion and the second connecting portion are sequentially arranged at intervals from left to right, the first flexible circuit portion is electrically connected to the sensing electrode lead, the second flexible circuit portion is electrically connected to the driving electrode lead, and the first connecting portion or the second connecting portion is designed to form an inclined angle with a horizontal line.

2. The touch control device according to claim 1, characterized in that: The fifth side is arranged at the upper right corner, the lower right corner, the upper left corner or the lower left corner of the substrate.

3. The touch control device according to claim 2, characterized in that: The included angle between the fifth side and its adjacent horizontal side is 15 to 75 degrees, and the length of the fifth side is 5 to 15 mm.

4. The touch control device according to claim 1, wherein: The angle is 15 to 75 degrees.

5. The touch control device according to claim 4, characterized in that: The lengths of the first connecting portion and the second connecting portion are both 5 to 15 mm, and the length of the second flexible circuit portion is 8 to 12 mm.

6. The touch control device according to claim 1, characterized in that: The fifth side is an arc segment, and the arc radius is 5 to 15 mm.

7. The touch control device according to claim 1, characterized in that: The substrate is polyethylene terephthalate (PET), cycloolefin polymer (COP), polycarbonate (PC), polymethyl methacrylate (PMMA) or cycloolefin copolymer (COC).

8. The touch control device according to claim 1, wherein: The touch sensing electrodes and the touch driving electrodes are made of indium tin oxide (ITO) film material, graphene film material, carbon nanotube material, metal nanowire material or metal mesh material.

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