CN102866811A - capacitive touch panel - Google Patents

Abstract

The present invention provides a capacitive touch panel, comprising a substrate, a protective layer, a sensing layer, a plurality of signal transmission lines and a capacitive shielding layer, wherein the substrate has an upper surface facing the protective layer and a lower surface away from the protective layer. The sensing layer is arranged in a sensing area of the upper surface, the signal transmission line is arranged in an upper edge area of the upper surface and electrically connected to the sensing layer, and the capacitive shielding layer is arranged in the upper edge area; or the sensing layer is arranged in a sensing area of the lower surface, the signal transmission line is arranged in a lower edge area of the lower surface and electrically connected to the sensing layer, and the capacitive shielding layer is arranged in the upper edge area or the lower edge area, thereby avoiding unnecessary additional introduction of signals or capacitances into the non-touch area of the touch panel to generate capacitive interference in the touch area.

Description

capacitive touch panel

technical field

The invention relates to a capacitive touch panel, in particular to a capacitive touch panel capable of resisting edge interference.

Background technique

Touch panels have been widely used in various consumer electronics products, such as mobile communication devices, portable media players, digital cameras and personal computers, etc. Compared with traditional input devices, they can provide a more intuitive operation interface .

As far as capacitive touch panels are concerned, for example, Taiwan Invention Patent Publication No. 201040819 discloses a sensing structure and sensing method for capacitive touch panels. The sensing structure includes a substrate and a plurality of first electrode groups group, a plurality of first wires, a plurality of second electrode groups and a plurality of second wires. The first electrode group respectively has a plurality of first electrodes distributed sequentially along a first direction of the substrate, and the first electrodes extend along a second direction of the substrate. The second electrode group has a plurality of second electrodes which are also distributed sequentially along the first direction of the substrate, wherein the second electrodes extend along the second direction of the substrate and intersect with the first electrode group. Each of the first wire and the second wire has a plurality of contact ends electrically connected with the first electrode and the second electrode respectively. By measuring the capacitance variation of the first electrode group and the second electrode group, the touch position of the user's finger is determined, and then related instructions are executed.

In the above-mentioned prior art, when the user's finger mistakenly touches the edge area of the non-first and second electrode groups, that is, the area corresponding to the first wire and the second wire, it will easily generate capacitive coupling with these wires, and then Interfering with the signals of these wires makes their sensing less accurate.

Contents of the invention

The main purpose of the present invention is to solve the problem that in the known capacitive touch panel, the circuit wires disposed in the edge area are easily disturbed by the user's false touch.

To achieve the above object, the present invention provides a capacitive touch panel, comprising a substrate and a protective layer opposite to the substrate, the substrate has an upper surface facing the protective layer, the upper surface includes a sensing area and an upper edge area adjacent to at least one side of the sensing area; a sensing layer arranged in the sensing area and a plurality of signal transmission lines arranged in the upper edge area for electrically connecting the sensing layer to a circuit board; and a capacitive shielding layer arranged between the upper edge region and the protection layer, the capacitive shielding layer at least partially shields the signal transmission line arranged in the upper edge region, thereby avoiding a capacitive interference occurring in the edge region.

To achieve the above object, the present invention further provides a capacitive touch panel, comprising a substrate and a protective layer opposite to the substrate, the substrate has a lower surface away from the protective layer and an upper surface facing the protective layer, The lower surface includes a sensing area and a lower edge area adjacent to at least one side of the sensing area, the upper surface has an upper edge area corresponding to the lower edge area; a sensing layer arranged on the sensing area and a plurality of signal transmission lines arranged in the lower edge area for the sensing layer to be electrically connected to a circuit board; and a capacitive shielding layer arranged between the upper edge area and the protective layer, the capacitive shielding layer is at least partially The signal transmission line disposed at the lower edge area is shielded, thereby avoiding a capacitive interference occurring at the lower edge area.

To achieve the above object, the present invention also provides a capacitive touch panel, comprising a substrate and a protective layer opposite to the substrate, the substrate has a lower surface away from the protective layer, the lower surface includes a sensing area and A lower edge area adjacent to at least one side of the sensing area; a sensing layer arranged in the sensing area and a plurality of signal transmission lines arranged in the lower edge area for electrically connecting the sensing layer to a circuit board ; and a capacitive shielding layer, the capacitive shielding layer at least partially shields the signal transmission line disposed in the lower edge region, thereby avoiding a capacitive interference occurring in the lower edge region.

From the above, it can be seen that the beneficial effect of the present invention compared with the prior art is that, through the setting of the capacitive shielding layer, the signal transmission line can be protected from signal interference caused by the user's false touch, and errors in calculating the touch position can be avoided , thereby improving the accuracy of the touch panel sensing.

Description of drawings

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

Fig. 2 is a schematic diagram of the cross-sectional structure of A-A' in Fig. 1 .

FIG. 3 is a schematic cross-sectional structure diagram of a second embodiment of the capacitive touch panel of the present invention.

FIG. 4 is a schematic cross-sectional structure diagram of a third embodiment of the capacitive touch panel of the present invention.

FIG. 5 is a schematic diagram of an exploded structure of a fourth embodiment of a capacitive touch panel of the present invention.

Fig. 6 is a schematic diagram of the B-B' sectional structure of Fig. 5 .

FIG. 7 is a schematic cross-sectional structure diagram of a fifth embodiment of the capacitive touch panel of the present invention.

Detailed ways

Relevant detailed description and technical content of the present invention, now just explain as follows with respect to matching drawing:

Please refer to FIG. 1 and FIG. 2, which are respectively a schematic diagram of an exploded structure of a first embodiment of a capacitive touch panel of the present invention and a schematic diagram of a cross-sectional structure of AA' in FIG. 1. The capacitive touch panel includes a substrate 10, a Protective layer 20, an induction layer 30, a plurality of signal transmission lines 40, a circuit board 50 and a capacitive shielding layer 60, the substrate 10 is arranged opposite to the protective layer 20, the substrate 10 has an upper surface 11, the upper surface 11 To face the protective layer 20 , the upper surface 11 includes a sensing region 12 and an upper edge region 13 adjacent to at least one side of the sensing region 12 . The sensing layer 30 is disposed on the sensing region 12 of the substrate 10, and the sensing layer 30 includes a plurality of first sensing units 31 and a plurality of first bridge wires 32 electrically connected to the first sensing units 31, and A plurality of second sensing units 33 and a plurality of second bridging wires 34 electrically connected to the second sensing units 33, wherein the first sensing units 31 and the second sensing units 33 overlap each other, and the first sensing units A dielectric layer 35 is disposed between a bridging wire 32 and the second bridging wire 34 , as shown in FIG. 2 .

In the embodiment, the first sensing unit 31 and the second sensing unit 32 of the sensing layer 30 are illustrated as rhombuses, but the present invention is not limited thereto, and the first sensing unit 31 The second sensing unit 32 can also be triangular, rectangular, rectangular or other polygonal shapes. As shown in FIG. 1 , the first sensing units 31 are arranged in a row along a first direction X and connected to each other through the first bridging wire 32 , and the rows are equidistantly spaced; the second sensing unit 33 Arranged in a row along a second direction Y and connected to each other through the second bridging wire 34, and the rows are equidistantly spaced, wherein the first sensing unit 31 and the second sensing unit 33 are used for The position of the touch point in the first direction X and the second direction Y is detected.

The capacitive shielding layer 60 is arranged between the upper edge region 13 and the protective layer 20, so as to avoid a capacitive interference occurring in the upper edge region 13. In this embodiment, the capacitive shielding layer 60 is arranged on the upper edge region 13. Between the signal transmission line 40 and the protective layer 20 in the edge area 13, and at least partially shield the signal transmission line 40, and an insulating layer 70 is also provided between the capacitive shielding layer 60 and the signal transmission line 40, and the protective layer 20 passes through An adhesive layer 80 is combined with the capacitive shielding layer 60 and the sensing layer 30 . The capacitive shielding layer 60 further includes a ground terminal 61 . According to actual design requirements, the capacitive shielding layer 60 may not be provided with the ground terminal 61 . In addition, the signal transmission lines 40 are arranged on the upper edge area 13 of the upper surface 11 of the substrate 10, the signal transmission lines 40 include a plurality of first signal transmission lines 41 and a plurality of second signal transmission lines 42, the first signal transmission lines 41 It has a first receiving end 411 and a first output end 412, the first receiving end 411 is electrically connected to the first sensing unit 31 on both sides of the sensing layer 30, the first output end 412 is connected to the circuit board 50 Electrically connected; the second signal transmission line 42 has a second receiving end 421 and a second output end 422, the second receiving end 421 is electrically connected to the second sensing unit 33 on the bottom side of the sensing layer 30, the The second output terminal 422 is electrically connected to the circuit board 50, so that the capacitance changes of the first sensing unit 31 and the second sensing unit 33 caused by the user touching the protective layer 20 can be output to the circuit board 50 to calculate the position touched by the user.

Please refer to FIG. 3 and FIG. 4 , which are schematic cross-sectional structure diagrams of the second embodiment and the third embodiment of the capacitive touch panel of the present invention, wherein the capacitive shielding layer 60 is arranged between the circuit board 50 and the protective layer 20 According to the actual manufacturing process, the capacitive shielding layer 60 can be adhered to the top surface of the circuit board 50, and the capacitive shielding layer 60, the signal transmission line 40, the sensing layer 30 and the protective layer 20 can be connected through the adhesive layer 80. or, the capacitive shielding layer 60 can be adhered to the bottom surface of the protective layer 20 corresponding to the upper edge region 13, and the protective layer 20 and the capacitive shielding layer 60 attached thereto are passed through The adhesive layer 80 is bonded with the circuit board 50 , the signal transmission line 40 and the sensing layer 30 , as shown in FIG. 4 . According to actual design requirements, the capacitive shielding layer 60 on the circuit board 50 can also completely cover the first signal transmission line 41 and the second signal transmission line 42 , without being limited by the size shown in the figure.

Please continue to refer to FIG. 5 and FIG. 6, which are a schematic diagram of an exploded structure of a fourth embodiment of a capacitive touch panel of the present invention and a schematic diagram of a cross-sectional structure of BB' in FIG. 5. The capacitive touch panel includes a substrate 10, a protective Layer 20, an induction layer 30, a plurality of signal transmission lines 40, a circuit board 50 and a capacitive shielding layer 60, the substrate 10 is arranged opposite to the protective layer 20, the substrate 10 has a lower surface 14 away from the protective layer and An upper surface 11 facing the protection layer 20, the lower surface 11 has a sensing area 15 and a lower edge area 16, the lower edge area 16 is adjacent to at least one side of the sensing area 15, the upper surface 12 has a The upper edge region 13 corresponds to the lower edge region 14 .

The signal transmission line 40 is arranged on the lower edge region 16 of the lower surface 11 of the substrate 10, the signal transmission line 40 includes a plurality of first signal transmission lines 41 and a plurality of second signal transmission lines 42, and the first signal transmission line 41 has a first a receiving end 411 and a first output end 412, the first receiving end 411 is electrically connected to the first sensing unit 31 on both sides of the sensing layer 30, and the first output end 412 is electrically connected to the circuit board 50; The second signal transmission line 42 has a second receiving end 421 and a second output end 422, the second receiving end 421 is electrically connected to the second sensing unit 33 on the bottom side of the sensing layer 30, the second output end 422 is electrically connected to the circuit board 50 . The capacitive shielding layer 60 is disposed between the upper edge region 13 and the protection layer 20 to at least partially shield the signal transmission line 40 to avoid a capacitive interference occurring in the lower edge region 16 .

In this embodiment, the capacitive shielding layer 60 is disposed between the upper edge region 13 of the substrate 10 and the protective layer 20, and the protective layer 20 is connected to the capacitive shielding layer 60 and the substrate by an adhesive layer 80 10 fit each other. Wherein, depending on the actual manufacturing process, the capacitive shielding layer 60 can be adhered to the upper edge region 13 of the substrate 10 , as shown in FIG.

Please continue to refer to FIG. 7, which is a schematic cross-sectional structure diagram of a fifth embodiment of the capacitive touch panel of the present invention. The difference between it and the fourth embodiment in FIGS. 5 and 6 is that the capacitive shielding layer 60 is arranged to cover the lower edge The signal transmission line 40 in the region 15 is at least partially shielded from the signal transmission line 40 , and in this embodiment, an insulating layer 70 is further disposed between the capacitive shielding layer 60 and the signal transmission line 40 .

In the present invention, the material of the substrate 10 can be glass, polyethylene terephthalate (PET for short) or polycarbonate (Polycarbonate, PC for short), and the material of the protective layer 20 can be glass, Polyethylene terephthalate (PET for short) or polycarbonate (PC for short), the first sensing unit 31 and the second sensing unit 33 can use indium tin oxide (Indium Tin Oxide, ITO for short) ), the first sensing unit 31 and the second sensing unit 33 can be formed on the sensing region 12 of the substrate 10 by sputtering (Sputtering), and the signal transmission line 40 can be formed by printing (Printing) or yellow photolithography Formed on the upper edge area 12 or the lower edge area 16 of the substrate 10 by means of wet etching, dry etching of laser etching, etc., the material can be silver or copper, and the material of the capacitive shielding layer 60 is metal, which is preferably The ground is silver, copper, chromium or conductive ink. The capacitive shielding layer 60 can also be coated on the insulating layer 70, the circuit board 50 or the like by printing, coating or sputtering. The protective layer 20 . In addition, the adhesive layer 80 is made of optically clear adhesives (OCA for short).

To sum up, the present invention mainly provides the capacitive shielding layer on the edge area of the substrate, and shields the signal transmission line through the capacitive shielding layer, which can avoid signal interference derived from the user’s false touch and reduce misjudgment of the touch position. opportunity, thereby improving the accuracy of the touch panel sensing.

The present invention has been described in detail above, and the above description is only a preferred embodiment of the present invention, and should not limit the implementation scope of the present invention. That is, all equivalent changes and modifications made according to the claims of the present invention should still fall within the scope of the claims of the present invention.

Claims (14)

1. a capacitance type touch-control panel is characterized in that, includes:

The protective seam (20) of one substrate (10) and a relatively described substrate (10), described substrate (10) has a upper surface (11) in the face of described protective seam (20), and described upper surface (11) comprises the upper edge region (13) of at least one side of a sensing region (12) and a described sensing region of adjacency (12);

One is located at that the inductive layer (30) of described sensing region (12) and many are arranged in described upper edge region (13) and the signal transmssion line (40) that is electrically connected to a circuit board (50) for described inductive layer (30); And

One is located at the capacitance shield layer (60) between described upper edge region (13) and the described protective seam (20); the described signal transmssion line (40) of described upper edge region (13) is located at least part of shielding of described capacitance shield layer (60), avoids by this betiding a capacitance interference of described upper edge region (13).

2. capacitance type touch-control panel according to claim 1 is characterized in that, also comprises the insulation course (70) of being located between described capacitance shield layer (60) and the described signal transmssion line (40).

3. capacitance type touch-control panel according to claim 1 is characterized in that, the material of described capacitance shield layer (60) is to be selected from the group that is comprised of chromium, copper and silver.

4. capacitance type touch-control panel according to claim 1 is characterized in that, described capacitance shield layer (60) is bonding on described protective seam (20).

5. capacitance type touch-control panel according to claim 1 is characterized in that, described capacitance shield layer (60) is bonding on described signal transmssion line (40).

6. a capacitance type touch-control panel is characterized in that, includes:

The protective seam of one substrate (10) and a relatively described substrate (10), described substrate (10) has a lower surface away from described protective seam (20) (14) and a upper surface towards described protective seam (20) (11), described lower surface (14) comprises the lower limb zone (16) of at least one side of a sensing region (12) and an adjacent described sensing region (12), and described upper surface (11) has the upper edge region (13) in a corresponding described lower limb zone (16);

One is located at that the inductive layer (30) of described sensing region (12) and many are arranged in described lower limb zone (16) and the signal transmssion line (40) that is electrically connected to a circuit board (50) for described inductive layer (30); And

One is located at the capacitance shield layer (60) between described upper edge region (13) and the described protective seam (20); the described signal transmssion line (40) in described lower limb zone (16) is located at least part of shielding of described capacitance shield layer (60), avoids by this betiding a capacitance interference in described lower limb zone (16).

7. capacitance type touch-control panel according to claim 6 is characterized in that, also comprises the insulation course (70) of being located between described capacitance shield layer (60) and the described signal transmssion line (40).

8. capacitance type touch-control panel according to claim 6 is characterized in that, the material of described capacitance shield layer (60) is to be selected from the group that is comprised of chromium, copper and silver.

9. capacitance type touch-control panel according to claim 6 is characterized in that, described capacitance shield layer (60) is bonding on described protective seam (20).

10. capacitance type touch-control panel according to claim 6 is characterized in that, described capacitance shield layer (60) is bonding on described signal transmssion line (40).

11. a capacitance type touch-control panel is characterized in that, includes:

The protective seam (20) of one substrate (10) and a relatively described substrate (10), described substrate (10) has a lower surface away from described protective seam (20) (14), and described lower surface (14) comprises the lower limb zone (16) of at least one side of a sensing region (12) and an adjacent described sensing region (12);

One is located at that the inductive layer (30) of described sensing region (12) and many are arranged in described lower limb zone (16) and the signal transmssion line (40) that is electrically connected to a circuit board (50) for described inductive layer (30); And

One capacitance shield layer (50), the described signal transmssion line (40) in described lower limb zone (16) is located at least part of shielding of described capacitance shield layer (50), avoids by this betiding a capacitance interference in described lower limb zone (16).

12. capacitance type touch-control panel according to claim 11 is characterized in that, also comprises the insulation course (70) of being located between described capacitance shield layer (60) and the described signal transmssion line (40).

13. capacitance type touch-control panel according to claim 11 is characterized in that, the material of described capacitance shield layer (60) is to be selected from the group that is comprised of chromium, copper and silver.

14. capacitance type touch-control panel according to claim 11 is characterized in that, described capacitance shield layer (60) is bonding on described signal transmssion line (40).

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