CN204009816U - Contact panel - Google Patents

Abstract

The utility model provides a touch panel, which includes a shielding layer; and a plurality of circuits, located on the shielding layer, and one end converges to a joint area for bonding with a circuit board; wherein, the shielding layer has a hollow pattern At least one side of the joint area is used as an alignment target for the joints of the lines and the circuit board. The touch panel provided by the utility model forms a hollow pattern on the shielding layer as an alignment target for the touch panel and the circuit board, and does not need to make additional metal alignment targets, which simplifies the structure and is beneficial to the touch panel. Precise alignment when bonding with the circuit board to improve yield.

Description

touch panel

technical field

The utility model relates to a touch panel, in particular to a touch panel which can reduce costs and effectively perform alignment.

Background technique

With the popularity of portable devices in recent years, the demand for touch panels as human-machine interfaces is increasing day by day. Generally speaking, whether it is a capacitive touch panel, a resistive touch panel or other types of touch panels, the bonding pads are used to electrically connect the flexible circuit board.

Please refer to FIG. 1 , which is a bottom view of a conventional touch panel, which includes a protective substrate 20, a shielding layer 21 that separates the touch panel into a visible area 10 and a non-visible area 11, a joint Pad 12 and a pair of alignment targets 13 . The touch panel uses the alignment target 13 to make the bonding pads 12 correspond to the signal pins of the flexible circuit board (not shown) for one-to-one bonding, so that the touch signal generated by the touch panel can pass through the bonding The pad 12 is transferred to the flexible circuit board, and then connected to the controller through the flexible circuit board to calculate the touch position.

Generally speaking, the alignment target 13 is made of opaque metal material, which is detected by an image detector at a calibration position, so as to perform alignment between the flexible circuit board and the bonding pad 12 . However, when the touch panel including the bonding pads 12 is formed of a fully transparent material such as ITO, the image detector for calibrating the position cannot detect the precise position of the transparent bonding pads because there is no metal alignment target. counterpoint.

Utility model content

In view of the above-mentioned problems in the prior art, the purpose of the present utility model is to provide a touch panel, which can realize precise alignment when the touch panel is bonded to the circuit board.

One idea of the present utility model is to provide a touch panel, which includes a shielding layer; and a plurality of lines, located on the shielding layer, and one end converges to a bonding area for bonding with a circuit board; wherein, the shielding layer There is a hollow pattern located at least on one side of the joint area, which serves as an alignment target for the joints of the lines and the circuit board.

Further, it further includes a protective substrate with light transmission, the shielding layer is located on a surface of the protective substrate, and is also located between the circuits and the protective substrate.

Further, the line pitch width of the hollow pattern of the shielding layer is less than or equal to 30 microns.

Further, the end of each of the lines includes a bonding pad, and the lines are bonded to the circuit board through the bonding pads.

Further, an anisotropic conductive layer is further included between the corresponding bonding pads and the circuit board.

Further, the anisotropic conductive layer further extends and covers the hollow pattern of the shielding layer.

Further, the color of the anisotropic conductive layer is the same or similar to that of the shielding layer.

Further, the anisotropic conductive layer is made of opaque or black material.

Further, the circuit board is a flexible circuit board.

Further, it further includes a touch electrode structure, the shielding layer divides the protective substrate into a non-visible area and a visible area, the shielding layer is located in the non-visible area, and the touch electrode structure is located in the visible area. One side of the protection substrate of the region, and electrically connected with the lines.

Further, the touch electrode structure is a single-layer transparent conductive structure.

Further, the touch electrode structure includes multiple layers of transparent conductive structures that are electrically insulated from each other.

Further, the materials of the lines and the bonding pads are transparent conductive materials.

Further, the lines and the transparent conductive structure are formed of the same transparent conductive material.

The touch panel provided by the utility model forms a hollow pattern on the shielding layer as an alignment target for the touch panel and the circuit board, and does not need to make additional metal alignment targets, which simplifies the structure and is beneficial to the touch panel. Especially when the fully transparent touch panel is bonded to the circuit board, it is precisely aligned to improve the yield rate.

Description of drawings

FIG. 1 is a bottom view of a conventional touch panel.

Fig. 2 is a bottom view of the touch panel of the present invention.

Fig. 3 is an enlarged cross-sectional view of the touch panel in Fig. 2 of the present invention.

FIG. 4 is a schematic diagram of a touch electrode structure of the present invention.

Detailed ways

In order to facilitate the understanding of the technical features, content and advantages of the utility model and the effects it can achieve, the utility model is hereby combined with the accompanying drawings, and described in detail in the form of embodiments as follows, and the drawings used therein, its The purpose is only for illustration and auxiliary instructions, not necessarily the true proportion and precise configuration of the utility model after implementation, so the scale and configuration relationship of the attached drawings should not be interpreted or limited to the actual implementation rights of the utility model The scope is described first.

The following is a description of the specific implementation of the utility model in conjunction with the drawings; however, it should be understood that the components marked in these drawings are for clarity of description, and do not represent actual dimensions and proportions, and are for drawing purposes only. Conciseness facilitates understanding, and drawing of conventional components is also omitted in some drawings.

FIG. 2 is a bottom view of the touch panel of the present invention, and FIG. 3 is an enlarged cross-sectional view of section 36 in FIG. 2 . Please refer to FIG. 2 and FIG. 3 at the same time. The present invention provides a touch panel, which includes a protective substrate 40 , a shielding layer 41 and a plurality of circuits 32 .

One surface of the protective substrate 40 can provide a user touch contact surface, and the opposite surface can be provided with a touch electrode structure. The protection substrate 40 has better light transmission, and can be a reinforced substrate or a flexible substrate, and can also be a 2-dimensional, 2.5-dimensional or 3-dimensional substrate. The protective substrate 40 can be made of glass, polyimide (PI), polypropylene (PP), polystyrene (PS), acrylonitrile-butadiene-styrene (ABS), polyethylene terephthalate ( PET), polyvinyl chloride (PVC), polycarbonate (PC), polyethylene (PE), polymethyl methacrylate (PMMA), polytetrafluoroethylene (PTFE) and other transparent insulating materials.

The shielding layer 41 is located on one surface of the protective substrate 40. In this embodiment, the shielding layer 41 is located on the lower surface of the protective substrate 40, and divides the touch panel into a visible area 30 and a non-visible area 31. The non-visible The area 31 is usually located on at least one side of the visible area 30, or its size and position can be adjusted according to the elements to be covered. In this embodiment, the non-visible area 31 is located at the lower side of the visible area 30 as an example, but It is not limited to this. The shielding layer 41 is usually formed of an opaque insulating material, such as opaque ink, photoresist or a laminated material of ink and photoresist. The shielding layer 41 is used for shielding some opaque components in the non-visible area 31 , such as circuit boards, lines and the like.

A plurality of circuits 32 are located on the shielding layer 41 , and one end converges to a bonding area 34 . The end of each circuit 32 located in the bonding area 34 includes a bonding pad 35 , and the circuit 32 is bonded to a circuit board 44 through the bonding pad 35 . It should be noted that the other end of the circuit 32 is electrically connected to the touch electrode structure (not shown in the figure, usually located in the visible area), so that the touch signal generated by the touch electrode structure can be transmitted to the circuit board through the circuit 32 44. Connect the controller via the circuit board 44 to calculate the touch position. The lines 32 and the bonding pads 35 can be formed of transparent or opaque conductive materials, such as indium tin oxide, silver, copper, molybdenum, aluminum, and the like. In order to save the manufacturing process or achieve the effect of narrow frame, the transparent conductive material with the same structure as the touch electrode in the visible area 30 can be formed in the same manufacturing process.

In addition, the shielding layer 41 is also located between the circuit 32 and the protective substrate 40, and the shielding layer 41 has a hollow pattern 33, and the hollow pattern 33 is located at least on one side of the bonding area 34, so as to serve as an alignment position for bonding the circuit 32 and the circuit board 44. Target. In this embodiment, two hollowed out figures 33 are used as an example, and they are respectively located on the left and right sides of the bonding area 34 , but it is not limited thereto. The number of hollowed out figures 33 can be one or more. Hollow pattern 33 is to form a specific pattern by hollowing out a part of the shielding layer, such as "L" shape, "mouth" shape or "cross" shape. Usually, the shape of the hollow pattern 33 is the same as the alignment target 46 on the circuit board 44 or complementary.

When the circuit board 44 is bonded to the bonding pad 35, the hollow pattern 33 can be used as an alignment target for the image detector to detect the calibration position and align with the alignment target 46 on the circuit board 44, so that the alignment target 46 on the circuit board 44 The corresponding signal pins 45 can be properly bonded to the bonding pads 35 . In particular, when the bonding pad 35 and the wire 32 are formed of transparent conductive materials, there is no need to form an opaque metal alignment target separately, and the image detector can directly obtain the outline of the hollow pattern 33 to match with that on the circuit board 44. The alignment target 46 is aligned to ensure that the circuit board 44 is correctly bonded to the bonding pad 35 . Preferably, the hollow pattern 33 has a pitch width less than or equal to 30 microns, so as not to be recognized by human eyes and to avoid affecting the appearance of the touch panel.

Please continue to refer to FIG. 3 , the touch panel of the present invention further includes an anisotropic conductive layer 43 located between the bonding pad 35 and the circuit board 44 for electrically connecting the bonding pad 35 and the circuit board 44 . After the touch panel receives a touch signal, the touch signal is transmitted to the circuit board 44 through the bonding pads 35 of a plurality of lines through the anisotropic conductive layer 43 . In one embodiment, the color of the anisotropic conductive layer 43 is the same or similar to that of the shielding layer 41, preferably opaque or black, and the anisotropic conductive layer 43 can only cover the bonding area, or further extend and cover the hollow pattern 33 , to compensate the color effect of the shielding layer 41, especially the corresponding position of the hollow figure 33, so that the color of the hollow figure 33 area is similar or the same as the color of other areas of the shielding layer 41, and it is difficult for the user to visually see that the shielding layer 41 has a hollow figure 33 The pattern maintains the aesthetic feeling of the appearance.

Please refer to FIG. 2 again. The touch panel of the present invention further includes a touch electrode structure 50. In this embodiment, the touch electrode structure 50 is located on the protective substrate 40 in the visible area 30, and is positioned with the shielding layer 41. Protect the same side of the substrate 40 . The touch electrode structure 50 can specifically be a single-layer or multi-layer transparent conductive structure. For example, as shown in FIG. Arranged at intervals in the same direction, each touch electrode 51 is electrically connected to the bonding pad 35 through the corresponding circuit 32 . In this embodiment, the touch electrode 51 is illustrated as a long strip, and it may also be in the shape of a wavy strip, a triangle, a comb, or the like.

In addition, the touch electrode structure 50 can also be a single-layer transparent conductive structure as shown in FIG. In an embedded state, and the two are electrically insulated from each other, the first electrode 52 and the second electrode 53 are respectively electrically connected to the corresponding circuit 54 , and are electrically connected to the circuit board through the circuit 54 . Specifically, the first electrode 52 can be set as a driving electrode, and the driving signal is input through the line 54 connected thereto, and the second electrode 53 is the sensing electrode, and the sensing signal is output through the line 54 connected thereto.

It should be noted that the touch electrode structure 50 of the present invention is not limited to the above-mentioned single-layer transparent conductive structure, but can also be a double-layer or multi-layer structure, for example, including interlaced and insulated X-axis electrodes and Y-axis electrodes. The direction electrodes, the X-axis electrodes and the Y-axis electrodes are respectively located in different layers, and the two are separated by a substrate or an insulating layer.

The aforementioned touch electrodes 51 , first electrodes 52 , second electrodes 53 and wires 54 can all be made of the same transparent conductive material, such as indium tin oxide (ITO), indium zinc oxide (IZO) ), fluorine doped tin oxide (fluorine doped tin oxide, FTO), aluminum doped zinc oxide (aluminum doped zinc oxide, AZO) or gallium doped zinc oxide (gallium doped zinc oxide, GZO).

To sum up, the touch panel proposed by the utility model forms a hollow pattern on the shielding layer as an alignment target for bonding the touch panel and the circuit board, and there is no need to make additional metal alignment targets, which simplifies the structure , which is conducive to the precise alignment of the touch panel, especially the fully transparent touch panel, when it is bonded to the circuit board, and improves the yield rate.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present utility model shall include Within the protection scope of the utility model.

Claims (14)

1. A touch panel, characterized in that, comprising: a masking layer, and A plurality of lines are located on the shielding layer, and one end thereof converges to a bonding area for bonding with a circuit board; Wherein, the shielding layer has a hollow pattern located at least on one side of the bonding area, serving as an alignment target for bonding the lines and the circuit board. 2. The touch panel according to claim 1, further comprising a protective substrate, which has light transmission, the shielding layer is located on one surface of the protective substrate, and is also located between the lines and the protective substrate between. 3 . The touch panel according to claim 2 , wherein a line pitch width of the hollow pattern of the shielding layer is less than or equal to 30 microns. 4 . 4. The touch panel as claimed in claim 2, wherein the end of each of the lines comprises a bonding pad, and the lines are bonded to the circuit board through the bonding pads. 5. The touch panel as claimed in claim 4, further comprising an anisotropic conductive layer located between the corresponding bonding pads and the circuit board. 6 . The touch panel according to claim 5 , wherein the anisotropic conductive layer further extends and covers the hollow pattern of the shielding layer. 7. The touch panel according to claim 6, wherein the color of the anisotropic conductive layer is the same or similar to that of the shielding layer. 8. The touch panel according to claim 7, wherein the anisotropic conductive layer is made of opaque or black material. 9. The touch panel as claimed in claim 1, wherein the circuit board is a flexible circuit board. 10. The touch panel according to claim 2, further comprising a touch electrode structure, the shielding layer distinguishes a non-visible area and a visible area from the protective substrate, the shielding layer is located on the In the non-visible area, the touch electrode structure is located on the protective substrate side of the visible area, and is electrically connected with the lines. 11. The touch panel according to claim 10, wherein the touch electrode structure is a single-layer transparent conductive structure. 12 . The touch panel according to claim 10 , wherein the touch electrode structure comprises multiple layers of transparent conductive structures electrically insulated from each other. 13 . 13. The touch panel according to claim 4, wherein the materials of the lines and the bonding pads are transparent conductive materials. 14. The touch panel according to claim 11 or 12, wherein the lines and the transparent conductive structure are formed of the same transparent conductive material.