TWI472978B - Touch panel - Google Patents

Description

Touch panel

The present invention relates to a touch panel, and more particularly to a capacitive touch panel.

In recent years, with the rapid development and application of information technology, wireless mobile communication and information appliances, many information products have been input devices such as traditional keyboards or mice for the purpose of being more convenient, lighter and more humanized. , changed to use a touch panel (Touch Panel) as an input device.

The touch panel can be roughly classified into a resistive touch panel, a capacitive touch panel, an optical touch panel, an acoustic wave touch panel, and an electromagnetic touch panel according to different sensing forms. Since capacitive touch panels have advantages such as fast response time, good reliability, and high definition compared with other types of touch panels, they are widely used in various types of handheld electronic devices.

The invention provides a touch panel, which can improve signal transmission quality and sensitivity of sensing.

The invention provides a touch panel, which comprises a substrate, a plurality of wires, a plurality of guiding pads, a plurality of connecting lines, a plurality of grounding lines and a plurality of virtual pads. The substrate has a first surface. The wires are arranged side by side on the first surface and are respectively Extending in a first direction. The guiding pad is disposed on the first surface, wherein there are N guiding pads between any two adjacent wires. The connecting wires are disposed on the first surface, and are respectively connected to the guiding pads, wherein the first to N guiding pads between the ith wire and the (i+1)th wire are respectively connected to the first to N connecting wires. The first to Nth connecting lines are arranged side by side and are located between the first to Nth conductive pads and the i+1th conductive wires, and all the jth connecting wires on the substrate are electrically connected to each other. j and i are positive integers. The grounding wires are arranged side by side on the first surface and extend in the first direction, wherein the ith grounding wire is located between the (i+1)th wire and the corresponding first to Nth connecting wires. The dummy pads are disposed on the first surface and are located between the ith wire and its corresponding first to N conductive pads.

In an embodiment of the invention, the first to Nth connecting lines extend to the same side of the substrate.

In an embodiment of the invention, the touch panel further includes a flexible circuit board. The flexible circuit board is disposed on the same side of the substrate. The first to Nth connecting wires are electrically connected to the flexible circuit board.

In an embodiment of the invention, part of the first to N connection lines extend to the first side of the substrate. The other portion of the first to N connecting lines extends to the second side of the substrate relative to the first side.

In one embodiment of the present invention, the touch panel further includes a first flexible circuit board and a second flexible circuit board. The first and second flexible circuit boards are electrically connected to each other, and are respectively disposed on the substrate. One of the first to N connection lines is electrically connected to the first flexible circuit board, and the remaining 1 to N connection lines are electrically connected to the first side and the second side of the first side. Two flexible boards.

In an embodiment of the invention, the material of the connecting wire comprises a conductive transparent material.

In an embodiment of the invention, the wires have the same width.

In an embodiment of the invention, the pads are of the same size.

In an embodiment of the invention, the size of the above-mentioned guide pads is different.

Based on the above, in order to adjust the distance between the wires and the corresponding pads, a plurality of dummy pads not participating in the circuit layout are disposed between the wires on the touch panel and the corresponding pads to reduce the wires and corresponding The effect of the parasitic capacitance generated between the pads on the touch quality. Moreover, the virtual pad is disposed between the wire and the corresponding conductive pad, which can reduce the uneven transmittance between the two when the touch panel is disposed on the backlight module. In addition, the present invention further provides a grounding wire between the wires on the touch panel and its corresponding connecting wires to reduce the problem that the two adjacent and side-by-side wires interfere with each other and cause poor signal transmission.

The above described features and advantages of the present invention will be more apparent from the following description.

1 is a top plan view of a touch panel in accordance with an embodiment of the present invention. Referring to FIG. 1 , the touch panel 100 of the present embodiment includes a substrate 110 , a plurality of wires Ry ₁ to Ry _i , a plurality of pads Tx ₁ to Tx _N , a plurality of connecting lines CL ₁ to CL _N , and a plurality of groundings. Lines GL ₁ ~ GL _N and a plurality of virtual pads 160. The wires Ry ₁ to Ry _{i are} juxtaposed on one of the first surfaces 112 of the substrate 110 and extend in a first direction D1, respectively. The pads Tx ₁ ~Tx _{N are} also disposed on the first surface 112. In detail, the plurality of pads Tx ₁ are arranged along a second direction D2 and are respectively connected in series by a plurality of connecting lines CL1 to form a first sensing series. Similarly, the pads Tx ₂ , . . . Tx _N all adopt the same layout to respectively form second to Nth sensing series extending in the second direction, wherein the first direction D1 is perpendicular to the second direction D2 . Here, the number of the wires Ry ₁ to Ry _{i of the} touch panel 100 and the pads Tx ₁ to Tx _N may be equal or different, and the present invention is not directed to the wires Ry ₁ to Ry _i and the pads Tx ₁ ~ The number of Tx _N is limited.

In this manner, the wires Ry1 to Ryi are arranged to intersect the pads Tx1 to TxN to achieve surface sensing. When the user touches the touch panel 100 with a finger, the wires Ry1 R Ryi of the touch panel 100 and the pads Tx1 T TxN generate a change in capacitance at a position where the finger contacts. The touch panel 100 can calculate the coordinates of the contact point and transmit it to the electronic device connected thereto by the change in capacitance. In general, if the wires Ry ₁ to Ry _i and the pads Tx ₁ to Tx _N are alternately arranged on different planes, the touch panel 100 will be visually different. Therefore, the wires Ry ₁ to Ry in this embodiment. _The arrangement of the _i and the pads Tx ₁ to Tx _N on the same plane can reduce the thickness of the touch panel 100 and increase the transmittance. Therefore, when the touch panel 100 and a display panel are integrated into a display having a touch function, the touch panel 100 can have better optical properties.

The structural configuration of the touch panel 100 will be further exemplified for the adjacent wires Ry ₁ and Ry ₂ and the components therebetween in FIG. 1 , but the structural configuration mode is not only applicable to the wires Ry ₁ and Ry ₂ . And suitable for extending to the entire touch panel 100.

As shown in FIG. 1, there are N pads Tx ₁ ~Tx _N between two adjacent wires Ry ₁ and Ry ₂ . The connection lines CL ₁ to CL _{N are} disposed on the first surface 112 and are connected to the pads Tx ₁ to Tx _{N , respectively} . In other words, the pads Tx ₁ to Tx _N between the wires Ry ₁ and the wires Ry ₂ are connected to the connection lines CL ₁ to CL _{N , respectively} . The connecting lines CL ₁ to CL _N are arranged side by side and are located between the pads Tx ₁ to Tx _N and the wires Ry ₂ , and all the connecting lines CL ₁ on the substrate 110 are electrically connected to each other to connect all the pads in the second direction. Tx ₁ forms a first sensing series. Similarly, the connecting lines CL ₂ , . . . , CL _N can all adopt the same layout to form the second to Nth sensing series, respectively. The connecting lines CL ₁ ~CL _N are mainly used for transmitting the sensing signals generated by the wires Ry ₁ -Ry _i and the pads Tx ₁ -Tx _N to a control circuit and transmitting the control signals output by the control circuit to the wires Ry ₁ ~Ry _i and the pad Tx ₁ ~Tx _N .

In the above, the connecting lines CL ₁ ~CL _N can be extended to the bridging area 114 of the touch panel 100, and the connecting lines CL ₁ -CL _N are electrically connected in the second direction D2 through the bridging elements on the bridging area 114, respectively. To form the first to Nth sensing series described above, respectively. In this embodiment, the touch panel 100 includes a first bridging region 114 and a second bridging region 116 respectively located on opposite sides of the substrate 110. The touch panel 100 further includes a first flexible circuit board 170a and a second flexible circuit board 170b disposed on the first bridging area 114 and the second bridging area 116, respectively, and the first circuit board 170a and the second circuit The plates 170b are electrically connected to each other. The part of the connecting lines CL ₁ to CL _{N are} electrically connected to the first flexible circuit board 170a, and the other part of the connecting lines CL ₁ to CL _N are electrically connected to the second flexible circuit board 170b. In this way, since all the connecting lines CL ₁ to CL _N are respectively connected to the bridge regions 114 and 116 on opposite sides of the substrate 110 , the wiring space on the touch panel 100 can be greatly saved, thereby reducing the volume of the touch panel 100 . Of course, the invention is not limited thereto. In other embodiments of the present invention, the connecting lines CL ₁ to CL _N may also be all connected to the same side of the substrate 110. For example, a flexible circuit board is disposed on one of the bridge areas of the touch panel, wherein the bridge area is located on one side of the substrate 110, and the connection lines CL ₁ to CL _{N are} electrically connected to the flexible circuit board.

In this embodiment, the material of the connecting lines CL ₁ to CL _N is a conductive transparent material, such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and Alumina Zinc ( Al doped zinc oxide, AZO) or indium oxide (Indium Oxide) or any combination of the above. Actually, in the present embodiment, the widths of the wires Ry1 to Ryi are the same, and the sizes of the pads Tx1 to TxN are also the same. However, the present invention is not limited thereto. In other embodiments of the present invention, the dimensions of the pads Tx1 T TxN may also be different, for example, according to the contact area (such as the size of a finger) or the resolution of the sensing. Make adjustments.

As described above, in the present embodiment, the ground lines GL ₁ to GL _{i-1 are} arranged side by side on the first surface 112 and extend in the first direction D1, respectively. In this embodiment, the grounding wires GL ₁ to GL _i-1 are respectively disposed between the wires and their adjacent connecting wires to reduce electrical interference between the wires and their adjacent connecting wires, resulting in poor signal transmission. For example as shown in FIG. 1, the ground line ground line GL ₁ positioned between CL _N ~ ₁ Ry ₂ wire connection line CL corresponding thereto, Ry ₂ corresponding thereto to prevent the connection lines CL ₁ - CL _N between the signal interfere with each other.

In addition, when the wires Ry ₁ to Ry _i and the corresponding pads Tx ₁ to Tx _N are too close together, the parasitic capacitance generated between the two may affect the normal operation of the touch panel. Therefore, the distance between the wires Ry ₁ to Ry _i and the corresponding pads Tx ₁ to Tx _N must be adjusted to an appropriate pitch. However, if the distance between the wires Ry ₁ to Ry _i and the corresponding pads Tx ₁ to Tx _N is large, the process may be difficult and the touch panel 100 may have uneven light transmission. In view of this, in the embodiment, the dummy pad 160 is disposed between the wire and the corresponding first to Nth conductive pads to adjust the distance between the wires Ry ₁ to Ry _i and the corresponding pads Tx ₁ to Tx _N . The touch panel 100 is kept in normal operation, and the uniformity of light transmission of the touch panel 100 can be maintained. Here, the dummy pad 160 is only used to separate the wires Ry ₁ -Ry _i and the corresponding pads Tx ₁ -Tx _N without participating in the circuit layout.

In summary, in order to adjust the distance between the wires and the corresponding pads, a plurality of dummy pads not participating in the circuit layout are disposed between the wires on the touch panel and the corresponding pads to reduce the wires. And the influence of the parasitic capacitance generated between the corresponding pads on the touch quality. Moreover, the virtual pad is disposed between the wire and the corresponding conductive pad, which can reduce the uneven transmittance between the two when the touch panel is disposed on the backlight module. In addition, the present invention further provides a grounding wire between the wires on the touch panel and its corresponding connecting lines to reduce the problem that the two adjacent and side-by-side wires interfere with each other and cause poor signal transmission.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. this The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ touch panel

110‧‧‧Substrate

112‧‧‧ first surface

114, 116‧‧‧ Bridge area

Ry ₁ ~Ry _i ‧‧‧ wire

Tx ₁ ~Tx _N ‧‧‧ Guide pad

CL ₁ ~CL _N ‧‧‧Connecting line

GL ₁ ~GL _i-1 ‧‧‧ Grounding wire

160‧‧‧Virtual mat

170a‧‧‧First flexible circuit board

170b‧‧‧Second flexible circuit board

D1‧‧‧ first direction

D2‧‧‧ second direction

1 is a top plan view of a touch panel in accordance with an embodiment of the present invention.

100‧‧‧ touch panel

110‧‧‧Substrate

112‧‧‧ first surface

114, 116‧‧‧ Bridge area

Ry ₁ ~Ry _i ‧‧‧ wire

Tx ₁ ~Tx _N ‧‧‧ Guide pad

CL ₁ ~CL _N ‧‧‧Connecting line

GL ₁ ~GL _i-1 ‧‧‧ Grounding wire

160‧‧‧Virtual mat

170a‧‧‧First flexible circuit board

170b‧‧‧Second flexible circuit board

D1‧‧‧ first direction

D2‧‧‧ second direction

Claims (9)

A touch panel includes: a substrate having a first surface; a plurality of wires arranged side by side on the first surface and extending along a first direction; a plurality of conductive pads disposed on the first surface Nth of the conductive pads are disposed between the two adjacent wires; a plurality of connecting wires are disposed on the first surface, and are respectively connected to the guiding pads, wherein the ith wire and the i+1th wire are located The first to Nth conductive pads between the wires are respectively connected to the first to Nth connecting wires, and the first to Nth connecting wires are arranged side by side and located between the first to Nth guiding pads and the (i+1th) conductive wires. And all the jth connecting lines on the substrate are electrically connected to each other, j and i are positive integers; a plurality of grounding lines are arranged side by side on the first surface, and respectively extend along the first direction, wherein the first a grounding wire is disposed between the (i+1)th wire and the corresponding first to Nth connecting wires; and a plurality of dummy pads disposed on the first surface and located on the ith wire Between the first and Nth guide pads corresponding thereto. The touch panel of claim 1, wherein the first to N connecting lines extend to the same side of the substrate. The touch panel of claim 2, further comprising a flexible circuit board disposed on the same side of the substrate, wherein the first to N connection lines are electrically connected to the flexible circuit board. Such as the touch panel described in claim 1 of the patent scope, part of which The first to N connecting lines extend to the first side of the substrate, and the other of the first to N connecting lines extend to the second side of the substrate relative to the first side. The touch panel of claim 4, further comprising a first flexible circuit board and a second flexible circuit board, wherein the first and second flexible circuit boards are electrically connected to each other and respectively disposed on the substrate The first side and the second side of the first side are electrically connected to the first flexible circuit board respectively, and the first to Nth connections are left. The wires are electrically connected to the second flexible circuit board, respectively. The touch panel of claim 1, wherein the material of the connecting wires comprises a conductive transparent material. The touch panel of claim 1, wherein the wires have the same width. The touch panel of claim 1, wherein the guide pads are the same size. The touch panel of claim 1, wherein the guide pads are different in size.