TWM452389U - Touch panel signal transmission cable line bridging structure - Google Patents

Description

Bridge combination structure of touch panel signal transmission cable

The present invention relates to a combination structure of a touch panel of a touch panel and a signal transmission cable.

Generally, the touch panel structure includes a transparent substrate, and the touch sensor is disposed on the substrate. The central portion of the touch sensor is set as a touch sensing area, and the peripheral edge is a line area in the line area. The inner cloth is provided with a plurality of signal wires connected to the touch sensing area, and a lap portion of the electrical contacts is disposed in one of the wider circuit areas, so that the signal wires are electrically connected to the lap portions respectively. Each of the electrical contacts, the lap portion can be affixed and bonded to a signal transmission cable, and the electrical contacts disposed on the two are respectively coupled to each other, thereby enabling the touch of the touch sensing area The signal is transmitted to the subsequent signal processing circuit through the signal wire and the signal transmission cable; when assembled, the substrate of the touch panel is stacked in front of the liquid crystal display (LCD) or the liquid crystal display module (LCM), and the signal is The signal transmission cable is bent and attached to the back of the LCD or LCM.

However, today's electronic products are designed with lightness and shortness as the trend. The product structure is more and more sophisticated, and the exterior design is changing more and more. Especially in the design of the panel, the image display area and the touch operation area are always desired. The larger the frame is, the thinner and smaller the frame is. The better the width of the line around the edge of the touch panel, especially for the line area with the lap. To be serious, this will severely compress the layout space of the signal wire and make As the area of the lap portion becomes smaller, the result is that the precision of the process processing becomes higher, the difficulty of the production technique is improved, and the yield is lowered, and at the same time, when the lap portion having a smaller area is overlapped with the signal transmission line It is also easy to cause poor connection precision, unreliable connection stability, and cause problems in the transmission performance of the touch signal; and according to the combined structure of the touch panel, the signal transmission cable is electrically connected to the electrical connection in the line area. Therefore, the head end portion of the signal transmission cable is overlapped and attached to the bottom surface of the stack of the substrate and the touch sensor, or is sandwiched and fixed between the substrate and the stack of the touch sensor. However, the signal transmission cable is usually a flexible printed circuit (FPC), and the thickness of the FPC lining is usually 0.15 mm or more. Therefore, the signal transmission cable at the bottom of the touch panel will be overlapped. The bumps are generated, but since the bottom surface of the touch panel needs to be mounted on the LCD/LCM, the above-mentioned convex portions may cause uneven installation, and it is not easy to be used in all-round electronic products commonly used today. Panel mounting (such as iPhone, iPad); in addition, in the use of the touch panel, the raised portion is more susceptible to external compressive stress, resulting in damage to the electrical contacts or signal wires of the raised portion, resulting in communication quality Bad phenomenon.

Taiwan Patent Publication No. M443226 discloses a signal transmission cable assembly structure of a touch panel, as shown in FIG. 10, which mainly extends the electrical contact overlapping portion of the touch sensor from the wiring region to the outside of the substrate. And then overlapped with the signal transmission cable, thereby reducing the layout space of the touch sensor line area, making the width of the frame smaller, and expanding the setting area of the lap to improve the touch sensor and signal transmission. The yield of the cable lap joint combination and the reliability after the combination; however, the signal transmission lines used in the design of the new touch panel are often as many as hundreds, so the signal transmission The combination of the transmission line and the splicing combination still has the risk of being easily broken and the lack of deviation in the alignment.

The present invention provides a bridge assembly structure for a touch panel signal transmission cable, which is covered with an insulating film on a signal wire and an electrical contact, and a through hole is formed in the insulating film at a corresponding position with the electrical contact. A bridge wire is disposed between two adjacent through holes, and the associated electrical contacts (for example, in the same X or Y axis) are connected in series, thereby greatly reducing the number of electrical contacts combined with the signal transmission cable Therefore, the volume of the signal transmission cable can be reduced, and the installation area of the electrical contacts can be enlarged, the accuracy and stability of the assembly can be promoted, and the technical difficulty can be reduced and the product yield can be improved.

In order to achieve the above-mentioned creative purpose, the bridge assembly structure of the touch panel signal transmission cable provided by the present invention comprises: a transparent substrate, and an insulating color frame is provided on a peripheral portion of the bottom surface of the substrate, so that the substrate is The visible area at the central portion and the shielding area at the peripheral edge portion are defined in the shielding area; a transparent touch sensor is disposed on the surface of the substrate and has a visible area in the substrate The plurality of touch sensing units are respectively connected to the first signal wires, and the first signal wires are electrically connected to the first electrical contacts of the substrate shielding area, and further disposed in the substrate shielding area. a second electrical contact and a third electrical contact, and electrically connected to the second electrical contact and the third electrical contact by the second signal wire; a bridge layer having a first electrical connection And an insulating film above the second electrical contact, wherein the insulating film is provided with a plurality of through holes corresponding to the first electrical contacts and the second electrical contacts, and two adjacent through holes on the same axis Bridge between the upper surfaces Lines, each first electrical contact on the same axis in series with each other and electrically connected to the second And a signal transmission cable, and a plurality of fourth electrical contacts corresponding to the third electrical contact are disposed on the flexible lining, and the second electrical contacts are electrically connected to the plurality of electrical contacts respectively a third signal wire; the signal transmission cable can be lapped and bonded to the edge of the shielding area of the substrate, and the fourth electrical contact and the third electrical contact are coupled to each other, thereby causing the sensing on the touch sensor The signal can be transmitted to the subsequent signal processing circuit via the signal transmission cable.

This will further clarify other functions and technical features of the present work, which will be implemented by those skilled in the art after reading the description in the text.

The present invention mainly includes a transparent substrate 1, a transparent touch sensor 2, a bridge layer 3, and a signal transmission cable 4.

As shown in FIG. 1 and 2, the substrate 1 is a high transmittance thin plate having excellent mechanical strength, and the material thereof is selected from various glasses, polymethyl methacrylate (PMMA), polycarbonate (PC), Polyester (PET) or cycloolefin copolymer (COC), etc., but the scope of implementation is not limited to the above materials; a color frame 12 is provided on the peripheral portion of the bottom surface of the substrate 1, and the color frame is made of a non-conductive material. The opaque film layer is formed, and the non-conductive material may be selected from materials such as inks or photoresists, but the range of materials that can be implemented is not limited thereto; and the materials are used by printing, coating, etc. A film layer having a thickness of about 15 μm is formed on a peripheral portion of the bottom surface of the substrate, and generally the color frame is less than 3 mm to meet the narrow-sided panel design requirement; accordingly, a frame-shaped shielding region 12a and a central portion are formed on the substrate at the peripheral portion. Can be seen in the area 13.

As shown in FIG. 3 to FIG. 6 , in the embodiment, the transparent touch sensor 2 is An alternating capacitive touch sensor is composed of a plurality of rows of sensing arrays 20 (as shown in FIG. 3), and each sensing array 20 includes a driving electrode 21 (as shown in FIG. 5) and a plurality of sensing electrodes 22 (eg, As shown in FIG. 6 , the driving electrode 21 and the sensing electrode 22 are mutually complementarily arranged (as shown in FIG. 4 ), and are electrically connected to the electrical contacts 24 at the edge of the panel by the signal wires 23 respectively; the touch sensor 2 is disposed on the substrate 1 , and has a plurality of rows of sensing arrays 20 in the substrate extending region 13 , and the electrical contacts 24 , 25 , 26 are disposed in the range of the substrate shielding region 12 a , wherein the electrical contacts 24 The signal wires 23 of the driving electrodes 21 and the sensing electrodes 22 are electrically connected, and the electrical contacts 25 and the electrical contacts 26 are electrically connected by the signal wires 27. The touch sensor 2 is made of a material having high light transmittance, and a transparent film made of indium tin oxide, indium zinc oxide, zinc aluminum oxide or polyethylene dioxythiophene may be used, and preferably, the touch is made. The control sensor 2 is directly disposed on the substrate 1, and the desired circuit pattern can be directly drawn by etching or laser.

As shown in FIG. 7 to FIG. 9, the bridge layer 3 is disposed in the substrate shielding area 12a, and the insulating film 31 is covered over the electrical contacts 24 and 25, and is opened at portions corresponding to the electrical contacts 24 and 25. There is a through hole 31a, and a bridge wire 32 is disposed on the upper surface of the insulating film 31. The bridge wire 32 is disposed between two adjacent through holes 31a of the X-axis, and the two ends of the bridge wire 32 are electrically connected and exposed. The electrical contacts 24 in the through holes 31a, according to which the electrical contacts 24 on the same X-axis are connected in series to each other and electrically connected to the electrical contacts 25 on one side. The above description is based on the example of two adjacent through holes 31a in which the bridge wires 32 are connected in series X to the axis, but the series range that can be implemented is not limited thereto.

The signal transmission cable 4 is a flexible printed circuit board (Flexible Print) Circuit (abbreviated as FPC) having a flexible lining 41, and a plurality of electrical contacts 42 and a plurality of signal wires 43 electrically connected to the electrical contacts are disposed on the bottom surface of the lining; FIG. 1 and As shown in FIG. 2, the front end of the signal transmission cable 4 can be affixed and fixed to the substrate shielding area 12a, and the electrical contacts 42 of the signal transmission line and the electrical contacts 26 of the touch sensor are coupled to each other. Accordingly, the sensing signal triggered on the touch sensor 2 can be transmitted to the subsequent inductive signal processing circuit (not shown) through the signal transmission cable 4 for processing the sensing signal to calculate the sensing position.

The foregoing description is based on the structure of a capacitive touch sensor, but the implementation scope thereof is not limited thereto. For example, other types of touch sensors such as a resistive touch sensor or an electromagnetic touch sensor are also used. applicable. In addition, in the illustration of the present embodiment, the sensing array 20 components of the touch sensor have been reduced in size, and the signal wires 23 and the electrical contacts 24, 25, and 26 components are enlarged to facilitate clear presentation. A structure that overlaps the bridge layer 3.

In summary, the present invention uses the bridge layer 3 to connect the associated electrical contacts to each other in series to greatly reduce the number of electrical contacts 24 combined with the signal transmission cable 4, thereby expanding the electrical contacts. The installation area promotes the accuracy and stability of the connection with the signal transmission cable, and reduces the difficulty of production technology, improves the yield of the lap joint combination and the reliability of the combination; in addition, the signal transmission cable can be reduced. The volume is convenient for the application of light and thin short structure design and can save material cost.

Although the present invention has been fully described with reference to the accompanying drawings and drawings, it will be understood that Such changes and modifications are to be understood as included within the scope of the present invention as defined by the scope of the appended claims.

1‧‧‧Substrate

12‧‧‧Color border

12a‧‧‧shadow area

13‧‧‧Korean District

2‧‧‧Touch sensor

20‧‧‧Sensor array

21‧‧‧Drive electrodes

22‧‧‧Induction electrode

23, 27, 43‧‧‧ signal wires

24, 25, 26, 42‧‧‧ electrical contacts

3‧‧‧Bridge layer

31‧‧‧Insulation film

31a‧‧‧through holes

32‧‧‧Bridge wires

4‧‧‧Signal transmission cable

41‧‧‧ lining

42‧‧‧Electrical contacts

43‧‧‧Signal wire

1 is a schematic view of the separation of the authoring components; FIG. 2 is a front view of the composition of the authoring component; FIG. 3 is a schematic layout of the touch sensing circuit of the present invention; FIG. 4 is an enlarged view of the portion A of FIG. 3; 3 is a layout diagram of the driving electrodes in the A portion; FIG. 6 is a schematic layout view of the sensing electrodes in the portion A of FIG. 3; FIG. 7 is a schematic diagram of the combination of the sensing touch circuit and the bridge layer; FIG. FIG. 9 is a cross-sectional view of the CC line taken along line CC; and FIG. 10 is a schematic view showing the separation of components of a conventional touch sensor and signal transmission cable assembly structure.

1‧‧‧Substrate

12‧‧‧Color border

12a‧‧‧shadow area

13‧‧‧Korean District

2‧‧‧Touch sensor

3‧‧‧Bridge layer

4‧‧‧Signal transmission cable

41‧‧‧ lining

42‧‧‧Electrical contacts

43‧‧‧Signal wire

Claims (1)

A bridge assembly structure of a touch panel signal transmission cable comprises: a transparent substrate, an insulating color frame is arranged on a peripheral portion of a bottom surface of the substrate, so that a visible region at a central portion is defined on the substrate And a shielding area at the peripheral edge portion, and in the shielding area; a transparent touch sensor disposed on the surface of the substrate, having a plurality of touch sensing units in the substrate viewing area, each touch sensing The first signal wire is respectively connected to the unit, and the first signal wire end is electrically connected to the first electrical contact of the substrate shielding area, and the second electrical contact and the third electrical connection are further disposed in the substrate shielding area. And electrically connecting the second electrical contact and the third electrical contact with the second signal wire; a bridge layer having an insulation covering the first electrical contact and the second electrical contact a film having a plurality of through holes corresponding to the first electrical contacts and the second electrical contacts, and a bridge wire disposed on an upper surface between two adjacent through holes on the same axis First electrical connections on the same axis Connected to each other in series and electrically connected to the second electrical contact; and a signal transmission cable having a plurality of fourth electrical contacts corresponding to the third electrical contact on the flexible backing plate, the second The electrical contacts are respectively electrically connected to the plurality of third signal wires; the signal transmission wires are overlapped and bonded to the edge of the substrate shielding area, and the fourth electrical contacts and the third electrical contacts are coupled to each other.