TWI645323B - Touch panel module - Google Patents

Abstract

The present invention discloses a touch panel module, which aims at the upper sensing electrode layer requiring openings to expose the bonding area of the lower sensing electrode layer, so that the film near the opening of the upper sensing electrode layer is prone to peeling, which affects the situation. The yield of the upper electrode is designed to keep the upper electrode away from the opening so that the distance is at least 2.5 mm or more, which reduces the occurrence of peeling conditions, thereby increasing the process yield and reducing production costs.

Description

Touch panel module

The invention relates to a touch panel module, which is applied to various electronic devices, and particularly to a touch panel module that increases the production yield by increasing the distance between an electrode and an opening.

Thanks to the advancement of science and technology, people can see portable electronic devices everywhere in life, such as laptops, tablets, smart phones, etc., and as the user's degree of dependence increases, the functions of portable electronic devices also It is becoming more and more powerful; the common feature of this kind of product is that it has a touch-sensitive display screen. In addition to being able to show a variety of multimedia videos to users, it can also provide users with a very convenient operating interface. Furthermore, in recent years, the trend of portable electronic devices is to provide touch operation with a larger screen, which makes operation more convenient and flexible for consumers.

At present, most of the conductive films of touch panels are indium tin oxide (ITO) films or nano-silver wire films, and the conductive film (or transparent electrode layer) is formed on a transparent substrate, for example, Glass plate or Polyethylene terephthalate (Polyethylene terephthalate, simply referred to as PET) plate; Among them, the nano silver wire film is composed of a plurality of nano metal wires.

A conventional manufacturing method for forming a conductive film (such as an indium tin oxide film or a nano-silver wire film) on a transparent substrate is to first apply a photoresist to the conductive film on the surface of the transparent substrate, and then, The conductive film is baked, and after the baking is completed, an exposure and development process is performed to form a transparent electrode layer with an electrode pattern on the substrate surface; thereafter, the transparent electrode layer on the substrate surface is cleaned, etched, washed, baked, etc. After the steps, screen printing is performed on the transparent electrode layer, so that a wiring layer is formed around the surface of the substrate to electrically connect adjacent transparent electrode layers, and finally, a touch substrate is obtained by baking again.

Generally speaking, touch screens can be divided into resistive touch screens and capacitive touch screens. Resistive touch screens are generated between the glass and the electrode due to the pressure applied by the user's touched position. The capacitive touch screen is sensed by the position of the user's touch because the capacitance of the electrode changes due to the touch. In the current design of capacitive touch panels, there are mainly designs in which an indium tin oxide (ITO) layer is made on glass and then laminated on strengthened glass, called GG (Glass Glass). There are also indium tin oxide The design that the layer is made of polyethylene terephthalate (PET) material and then bonded to the strengthened glass is called GFF (Glass Film Film).

The GFF (double-layer film) structure has a double-layer ITO film. The two layers have the wiring of the receiving (RX) electrode and the wiring of the transmitting (TX) electrode. Then, they are adhered and bonded. The lower electrode can be connected to the outside, and the upper film needs to be provided with an opening at a position corresponding to the lower bonding region, so that the lower bonding region is exposed for subsequent conduction. In terms of manufacturing process, this opening is mostly formed by stamping. Therefore, after adhesion, the adhesion at this location will be poor, and it is easy to cause peeling at this location. Once the peeling condition erodes the upper electrode, it will To make it fail, in practice, its defect rate can reach 3 to 10%, which has a dramatic impact on the overall yield.

In view of this, the present invention addresses the lack of existing technology, and its main purpose is to provide a touch panel module that can effectively reduce the peeling of the sensing electrode layer near the opening and affect the condition of the electrode, thereby improving production yield and reducing manufacturing costs. .

Therefore, in order to achieve the above object, the present invention provides a touch panel module including a first sensing electrode layer, a second sensing electrode layer, and a first adhesive layer. The first sensing electrode layer has a plurality of first electrodes. An electrode is electrically connected to the first bonding region. The second sensing electrode layer has a plurality of second electrodes. The second electrode is electrically connected to the second bonding region. The first bonding layer is bonded to the first sensing electrode layer and the second bonding layer. The sensing electrode layers are adhered to each other, and the second sensing electrode layer is provided with an opening corresponding to the first bonding region of the first sensing electrode layer to expose the second bonding region, and the shortest between the mouth and the second electrode The distance is more than 2.5 millimeters (mm), and the condition that the electrode is peeled near the opening and affects the electrodes can be greatly improved, which can reduce manufacturing costs, increase production capacity, improve production yield, and improve competitive advantage.

According to an embodiment of the present invention, the second sensing electrode layer may be an indium tin oxide (Indium tin oxide (ITO) film).

According to an embodiment of the present invention, the second sensing electrode layer may be a composite film composed of an indium tin oxide film and a copper film.

According to an embodiment of the present invention, when the surface resistance of the second sensing electrode layer is greater than 70 ohms / square (ohm / sq) and less than or equal to 100 ohms / square, the shortest distance between the opening and the second electrode is 2.5 to 3.5 mm.

According to an embodiment of the present invention, when the surface resistance of the second sensing electrode layer is less than or equal to 70 ohms / square, the shortest distance between the opening and the second electrode is 3.5-4.5 mm.

According to an embodiment of the present invention, the touch panel module disclosed in the present invention may further include an adhesive layer to adhere the first sensing electrode layer and the two sensing electrode layers.

Detailed descriptions will be provided below through specific embodiments to make it easier to understand the purpose, technical content, features and effects of the present invention. In the following, detailed descriptions will be made through specific embodiments in conjunction with the accompanying drawings to make it easier to understand the purpose, technical content, features and effects of the present invention.

The present invention discloses a touch panel module. The touch panel is applied to, for example, a display device, a tablet computer, a smart phone, a notebook computer, a desktop computer, a television, a satellite navigation, an in-vehicle display, an aviation display, or a portable Various electronic devices such as a DVD player, and the conductive film of the touch panel are mostly an indium tin oxide (ITO) film or a nanosilver film. And touch screens can be divided into resistive touch screens and capacitive touch screens. Among them, capacitive touch panels are mainly made of indium tin oxide (ITO) layer on glass and then bonded to tempered glass. It is called GG (Glass Glass), and there is also a design in which an indium tin oxide layer is made on a polyethylene terephthalate (PET) film and then bonded to a strengthened glass, which is called GFF. (Glass Film Film). The present invention mainly focuses on a part of a double-layer film (Glass Film Film; GFF).

Please refer to FIG. 1 and FIG. 2, which respectively illustrate a three-dimensional schematic diagram and a combined schematic diagram of a touch panel module provided by the present invention. The touch panel module 1 includes a first sensing electrode layer 10 and a second sensing electrode layer 20, which are indium tin oxide (Indium tin oxide (ITO) films), that is, an indium tin oxide layer Manufactured on polyethylene terephthalate (PET) film. Of course, the material is not particularly limited, but in the current market, the type of ITO formed on PET film is most widely used. The first sensing electrode layer 10 and the second sensing electrode layer 20 have a first electrode 11 and a second electrode 21, respectively. That is, the first sensing electrode layer 10 has a plurality of first electrodes 11 and the second sensing electrode layer 20 has Plurality of second electrodes 21.

For example, the first sensing electrode layer 10 may be a receiving (RX) electrode layer disposed on the lower layer, and the second sensing electrode layer 20 may be a transmitting (TX) electrode layer disposed on the upper layer, which is distributed on the touch panel. The sensing area provides sensing during user operation, and the surrounding area is the border area of the touch panel. In general, the wiring of the first electrode 11 on the first sensing electrode layer 10 and the second electrode 21 on the second sensing electrode layer 20 is roughly vertical, and because it needs to be attached to each other in the future, it comes to size. That is to say, the first sensing electrode layer 10 and the second sensing electrode layer 20 are also roughly the same; similarly, this part is only an example to be explained in conjunction with the drawings, and is not intended to limit the type of its circuit layout. The appearances in the description are for illustration only, and are not intended to limit the scope of rights to be protected by the present invention.

Then, the first sensing electrode layer 10 has a first bonding area 12, which is electrically connected to the first electrode 11 to facilitate communication with an external source. Similarly, the second sensing electrode layer 20 also has a second bonding area. The region 22 is electrically connected to the second electrode 21. The first sensing electrode layer 10 and the second sensing electrode layer 20 are adhered to each other by a first adhesive layer 30. Among them, the most common one of the first adhesive layer 30 is OCA Optical Clear Adhesive (OCA). It is cured by ultraviolet light to produce an adhesive effect, and at the same time has a high light transmittance (> 99%), so it is suitable for the bonding of this type of products; in order to make the first bonding region of the lower first sensing electrode layer 10 still adhere after bonding It can be exposed that the second sensing electrode layer 10 is provided with an opening 23 at a corresponding position.

Continuing, please refer to FIG. 3, which illustrates a schematic diagram of the shortest distance between the opening of the touch panel module and the second electrode provided by the present invention. Because of this structure, the vicinity of the opening 23 will inevitably become the position with the weakest adhesion force. Once peeling occurs, it will start from the adjacent area, which will affect the adjacent second electrode 21. In order to overcome this inherent limitation, the present invention will Two electrodes 21 and opening 23 The relative distance D increases, in other words, the shortest distance D between the opening 23 and the second electrode 21 is designed to be 2.5 millimeters (mm) or more, so that the peeling near the opening 23 can greatly reduce the condition of the second electrode 21 and increase. Yield of production.

Practically speaking, in the case of an indium tin oxide (ITO) film or a composite film composed of an ITO film and a copper film, when the surface resistance of the second sensing electrode layer 20 is greater than 70 ohm / sq (ohm / sq) When it is less than or equal to 100 ohm / square, the shortest distance D between the opening 23 and the second electrode 21 is preferably 2.5 to 3.5 mm; and when the surface resistance of the second sensing electrode layer 20 is less than or equal to 70 ohm / square ( ohm / sq), the shortest distance D between the opening 23 and the second electrode 21 is preferably 3.5-4.5 mm; in this way, this bad situation can be greatly reduced.

Next, referring to FIG. 4, a second adhesive layer 40 may be further disposed above the second sensing electrode layer 20 for subsequent bonding of a substrate (not shown) to form a double-layer film (GFF). Type. The material of the substrate may be glass, or glass doped with polyethylene terephthalate (PET); and the second adhesive layer 40 is the same as the aforementioned first adhesive layer 30, but OCA optical glue.

In summary, according to the touch panel module provided by the present invention, the distance between the opening of the upper sensing electrode layer and its electrode is widened, so that even if there is a peeling phenomenon, it will not affect the electrode, which can improve the overall Yield rate, greatly improving the competitive advantage of the industry.

The foregoing are merely preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Therefore, all equal changes or modifications made according to the features and spirit described in the scope of the application of the present invention shall be included in the scope of patent application of the present invention.

1‧‧‧touch panel module

10‧‧‧First sensing electrode layer

11‧‧‧first electrode

12‧‧‧ first continuation zone

20‧‧‧Second sensing electrode layer

21‧‧‧Second electrode

22‧‧‧Second Adjoining Zone

23‧‧‧ opening

30‧‧‧ the first adhesive layer

FIG. 1 is a schematic perspective view of a touch panel module provided by the present invention. FIG. 2 is a schematic diagram of a touch panel module provided by the present invention. FIG. 3 is a schematic diagram of the shortest distance between the opening of the touch panel module and the second electrode provided by the present invention. FIG. 4 is a schematic diagram of adding a second adhesive layer to the touch panel module provided by the present invention.

Claims (6)

A touch panel module includes: a first sensing electrode layer, the first sensing electrode layer having a plurality of first electrodes and a first bonding area electrically connected to the first electrodes; and a second A sensing electrode layer, the second sensing electrode layer having a plurality of second electrodes and a second bonding region electrically connected to the second electrodes; the second sensing electrode layer is disposed on the first sensing electrode layer, and An opening adjacent to the second bonding region is provided for the first bonding region to be exposed. The shortest distance between the opening and the second electrodes is 2.5 millimeters (mm) or more. The touch panel module according to claim 1, wherein the second sensing electrode layer is an indium tin oxide (ITO) film. The touch panel module according to claim 1, wherein the second sensing electrode layer is a composite film composed of an indium tin oxide film and a copper film. The touch panel module according to claim 1, wherein when the surface resistance of the second sensing electrode layer is greater than 70 ohm / square (ohm / sq) and less than or equal to 100 ohm / square, the opening and The shortest distance of the second electrodes is 2.5-3.5 mm. The touch panel module according to claim 1, wherein when the surface resistance of the second sensing electrode layer is less than or equal to 70 ohms / square, the shortest distance between the opening and the second electrodes is 3.5 to 4.5 mm. The touch panel module according to claim 1, further comprising an adhesive layer to adhere the first sensing electrode layer and the two sensing electrode layers.