KR20200079357A - touch panel placed in dashboard of vehicle using PEDOT and method of making the same - Google Patents

Abstract

Disclosed are a touch panel for a vehicle dashboard using poly 3,4-ethylenedioxythiophene (PEDOT) and a method of manufacturing the same. The touch panel includes a display device, a touch pad attached to and coupled to a screen of the display device and having a flexible board having a conductive pattern formed through a printing scheme, and a control board connected with the touch pad. The vehicle dashboard is covered with a protective layer having a conductive pattern including an integral-type PEDOT-based conductive polymer single layer and a connection part terminal including a material containing carbon. In this case, the protective layer of the terminal may be formed as the protective layer is cut out of a spacing part between a plurality of individual terminals adjacent to each other by irradiating a laser beam after printing, as an entire pattern, the plurality of individual terminals adjacent to each other and a spacing part between the plurality of individual terminals adjacent to each other. According to the present invention, all conductive patterns constituting the touch pad of the touch panel may be integrated into a single transparent conductive polymer pattern and may be formed through a printing scheme, and even a protective layer, which is provided on the connection part terminal, including a member containing carbon may be formed through a separating scheme based on the printing scheme and the laser beam irradiation scheme, thereby simplifying a process of forming the conductive pattern. In addition, the present invention may be realized through at a lower-cost process.

Description

Touch panel placed in dashboard of vehicle using PEDOT and method of making the same}

The present invention relates to a touch panel and a method for forming the same, and more particularly, to a touch panel installed on a vehicle dashboard and used for controlling a vehicle element.

Recently, a display device and a touch pad are combined, and these are coordinated through a control device such as a control board, so that a user touches a portion of the display screen to implement a function assigned to a corresponding area on the display or a touch screen panel (TSP). Is used a lot. Such a touch panel can be used in various ways as a control and input means as a display device for a mobile phone, a tablet computer, a notebook computer, and various equipment. Recently, as the use of smartphones increases, the use thereof is rapidly increasing.

The touch pad used in such a touch panel allows the desired function to be selected and realized by instantly touching the object displayed on the display, so it is not necessary to have a separate input device such as a separate keyboard because it is integrated with the display to increase user convenience. Portability can also be improved.

Touch pads are well known in detail because they have been developed with various methods and structures. For example, capacitive touch pads are particularly classified in several ways, and each structure is well known and most used. Resistive touch pads are also known from the beginning for their advantages such as enabling precise touch. Since various configurations and methods of the touch pad are well known in the art and are mostly established, a description of each specific configuration will be omitted herein.

The touch pad should be transparent so that the user can see and touch the screen of the display combined with it on the touch panel. Normally, the detection of the touched area is the conductive layer or the conductive pattern in the most commonly used capacitive or resistive touch pad. Becomes essential.

Accordingly, a transparent conductive film is used on the transparent substrate forming the touch pad so that the display screen can be seen through the touch pad when forming the conductive film or the touch pattern of the touch area. Phosphorus ITO (indium tin oxide) is the most widely used.

On the other hand, the vehicle dashboard is mainly composed of an instrument panel, a center fascia, and a console box, where the instrument panel and the center fascia are intensively equipped with buttons for adjusting the display screen and vehicle elements. Conventionally, the display screen and the control button often have separate configurations, and the control button is mainly focused on a mechanical configuration such as a push button, but in recent years, the vehicle's electric field elements have been strengthened and the user's convenience has been emphasized. The introduction of a touch panel method that can be integrated intuitively is increasing.

1 is a cross-sectional view showing an example of a coupling configuration between a touch pad and a control board of a touch panel for a vehicle dashboard used in the related art, and FIG. 2 is a plan view showing an example of a flat configuration of a touch pad for a vehicle dashboard. .

When described with reference to these drawings, there is a display device (not shown) that is usually combined to form a touch panel below the substrate 11 forming a flat-type touch pad, and the connection portion 20 of the touch pad has a conductive pattern. A part of the terminal pattern is combined with the conductive layer 31 of the flexible printed circuit board (FPCB:30) through an anisotropic conductive film (ACF). The conductive layer 31 exposed on the other end of the flexible printed circuit board is connected in various ways to the terminal pattern 45 exposed on the surface of the substrate 41 of the control board 40. In the end, flexible printed circuit boards with materials and configurations that can be easily bent allow the touchpad and control board to be electrically spaced apart from each other and not to be located on the same plane.

In Fig. 1, reference numeral 13 is used for attaching an ITO layer, reference numeral 15 is a silver paste layer, reference numeral 17 is an overcoat film for protecting these conductive patterns, and reference numeral 19 is used to attach another substrate layer or window thereon. The OCA layers described above are respectively shown.

Here, the silver paste layer is usually formed to partially overlap with the touch pattern of the ITO material of the touch area, and thus is used a lot to increase the conductivity and signal stability of the connection by forming the terminal pattern and the connection pattern of the connection portion. At this time, silver, which is the main material of the silver nanowires included in the silver paste, is basically an opaque material or is transparent when the size is reduced in nano units. In particular, in order to have transparency in the visible light region (400 to 700 nm), the diameter or thickness should be 100 nm or less. On the other hand, in relation to conductivity, when the resistivity of silver increases to less than 10 nm, a rapid increase in resistivity occurs.

Referring to FIG. 2, the touch pad of the touch panel for a vehicle dashboard is formed on a touch pattern 13 of a touch area made of an ITO layer as a conductive pattern and a connection portion 20 that is an area for electrical connection with a control board. It has a terminal pattern and a connection pattern 15 that connects the touch pattern and the terminal pattern, wherein the silver paste layer forming the integral connection pattern and the terminal pattern has a certain degree to ensure conductivity even though it is formed in a thin pattern. It should have a thickness, and the thicker the thickness, the faster the transparency. Therefore, the silver paste layer is more like a translucent pattern than a transparent pattern, and may be recognized as opaque.

In the conventional touch pad for vehicle dashboards, the ITO layer is adopted for forming the transparent conductive pattern 13, which is usually made through a vacuum thin film process such as sputtering deposition, and in order to form a circuit pattern You have to go through a photolithography process. These processes have a problem that the process conditions are strict and complicated, and the process equipment is expensive.

In addition, as the frequency and use of the touch panel increases, the need to apply it to the flexible display is also increasing, and after the conductive pattern is formed on the substrate, the substrate is bent or deformed, and ITO is used in this case. There is a problem that it is difficult to maintain the adhesion state with a quadrature. When forming a part of the pattern with the silver paste, this problem can be compensated to some extent, but a new problem occurs with the use of the silver paste pattern.

For example, since the ITO conductive pattern of the touch area and the silver paste pattern of the connecting portion and the connecting portion are formed through separate processes from each other, many process steps are required to form the conductive pattern, which makes the entire process cumbersome.

In addition, when a silver paste conductive pattern is used for forming a long conductive pattern such as a connection pattern of a touch pad, conductivity is improved, but as the silver paste pattern becomes thicker, transparency is rapidly lowered and the silver paste pattern on the touch panel shown in FIG. It is easy to appear as a rather opaque part.

In particular, instead of using the FPCB, which was conventionally used to connect the touch pad and the control board, instead of forming a part of the touch pad as long as the FPCB and having a configuration such that the connecting portion is directly connected to the control board, the connecting portion 20 The connection pattern 15 that connects the touch pattern 13 and the connection portion 20 that is far away from each other becomes longer and can form a shape that crosses a large area of the touch pad, which makes it unobtrusive in the screen configuration of the touch panel. Can be.

Therefore, the silver paste is often used in a limited form by forming it in a printed form on a part where transparency is not a problem, and the design of the panel form may be limited by the silver paste line.

In order to solve the problems associated with the use of the ITO layer, a lot of development studies have been conducted to form and use a transparent conductive pattern made of a polymer of PEDOT series instead of an ITO film in direct printing form.

However, PEDOT is difficult to adjust the viscosity, so inkjet printing is not suitable, and it is not easy to form a fine pattern because of its large flowing property, and short circuit between adjacent patterns may occur.

WO 2012015254A2: Method for manufacturing transparent conductive film and transparent conductive film produced thereby Republic of Korea Patent Publication No. 10-2014-0125932: Printed layer integrated touch screen panel Republic of Korea Registered Patent No. 10-1617784: Touch screen type automobile center facer panel and its manufacturing method Republic of Korea Patent Registration No. 10-1648029: Touch screen display device, a vehicle equipped with a touch screen display device and a method for controlling the touch screen display device Republic of Korea Patent Publication No. 10-2013-0069076: Touch panel substrate and FPCB connection structure Republic of Korea Patent No. 10-1095097: Transparent electrode film and its manufacturing method Republic of Korea Patent Publication No. 10-201700073679: Method of manufacturing a conductive paste and conductive paste

The present invention is to solve the problem of the application of the existing touch panel for a vehicle dashboard as described above, an object of the present invention is to provide a touch panel for a vehicle dashboard with a conductive pattern suitable for a center fascia and the like and a method for forming the same. Should be

The present invention provides a touch panel for a vehicle dashboard and a method of forming the same, which can be formed at a lower cost than an existing ITO conductive pattern, simplify the process, and improve the overall transparency of the touch panel to increase the degree of freedom in screen composition. It aims to do.

According to an aspect of the present invention to provide a touch panel for a vehicle dashboard and a method of forming the same, which can solve the problem of alignment of a plurality of material layers constituting the terminal when the terminal is protected and the terminal exposed at the touch pad connection part of the touch panel. It is aimed at.

The touch panel for a vehicle dashboard of the present invention for achieving the above object is attached to a display device, a display device screen, and a touch pad having a flexible transparent substrate having a conductive pattern formed by a printing method, and a control board connected to the touch pad. The conductive pattern is made of a single layer of an integrated PEDOT-based conductive polymer, but a terminal for connection to the control board at the connection portion of the touch pad is a conductive protective layer made of a carbon-containing material such as carbon paste on the conductive polymer. It characterized in that it comprises a.

The conductive pattern of the present invention is a PEDOT-based conductive polymer on a substrate, and is formed of a printing method using a material containing poly 3,4-ethylenedioxythiophene (PEDOT), and between individual patterns to prevent short circuits between adjacent individual patterns after printing. It may be a pattern obtained as a result of laser irradiation to remove the conductive polymer that may be present in.

In the present invention, the conductive pattern is installed in a touch area of the touch pad to form a touch pattern, a portion forming a terminal pattern provided in a connection portion for connection with a control board, and a connection pattern connecting a touch pattern and a terminal pattern of the connection portion. It can be divided into two parts.

In the present invention, between the connection part and the control board, separate FPCB and ACF are not mediated, and the connection part and the terminal of the control board can be directly connected.

In the present invention, the touch panel may be installed on the entire front surface of the vehicle center fascia, and the flexible substrate may be formed of a three-dimensional surface.

The method of forming a touch panel for a vehicle dashboard of the present invention for achieving the above object is to form a touch panel for a vehicle dashboard of the present invention, the conductive pattern of a touch pad attached to a display device screen and coupled to the PEDOT series conductivity It is formed in a printing method with a polymer, and a protective layer made of a carbon-containing material is further provided in a printing pattern in a cylindrical pattern on the connection part, and a protective layer in the form of a cylindrical pattern of the connecting portion is individually terminal patterned by laser irradiation. It is characterized in that to separate the terminal pattern to form a layer structure on which a protective layer of carbon-containing material is placed on the conductive polymer.

In the present invention, even when forming a PEDOT-based conductive polymer layer for the terminal pattern of the connecting portion, the process of subsequently separating the conductive polymer layer at the connecting portion into individual terminals in a state in which the individual terminals are stacked in a cylindrical pattern rather than in a separate state. It may be made, and this is not limited to the connection part, but may also be made in a connection part in which a plurality of individual connection patterns are formed long and side by side at small intervals.

According to the present invention, all of the conductive patterns constituting the touch pad of the touch panel can be integrally formed of a single transparent conductive polymer pattern, and can be formed by a printing method, thereby simplifying the process of forming a conductive pattern, and a low-cost process. Can be implemented through

According to the present invention, when forming a reinforcement pattern of a carbon-containing material on a conductive polymer pattern of the PEDOT series of the connection part by a printing method, the terminal pattern as an adjacent individual fine pattern formed with small gaps is first formed in the form of a cylindrical pattern and between the individual patterns. It is possible to increase the effectiveness of the process and to eliminate the risk of short circuit stably through the laser processing.

According to an additional aspect of the present invention, in forming a touch panel for a vehicle dashboard, alignment between the reinforcement pattern and the polymer pattern is not a significant problem in the process of forming the terminal pattern of the touch pad connection portion, thereby solving the problem of defect due to alignment. Can.

1 is a cross-sectional view showing an example of a related configuration of a main part of a touch pad and a control board of a conventional vehicle touch panel,
2 is a plan view of an example of a touch pad of a conventional vehicle touch panel,
3 is a plan view showing a conductive pattern in a touch pad in one step of the present invention,
4 is a plan view showing a conductive pattern in a touch pad at another stage of an embodiment of the present invention;
FIG. 5 is a partial plan view showing a state in which a reinforcement layer made of a carbon-containing material is installed in a tubular pattern form in a printing manner over a terminal pattern that is an individual pattern of a connection part in the same state as in FIG. 4;
FIG. 6 is a partial plan view showing a state in which the protective layer in the form of a barrel pattern is processed by laser in the same state as in FIG. 5 to remove the protective layer from portions between the terminal patterns to be divided into individual terminal patterns;
7 is a cross-sectional view showing a simplified configuration of one substrate layer constituting a touch pad according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to drawings.

In the method of the present invention, in forming a touch panel for a vehicle dashboard comprising a display device such as a display panel, a touch pad coupled to a screen of the display device, and a control board for driving the touch pad, first, a display device and a control board And touch pads, respectively, and through the process of combining them.

Among these, when forming a PEDOT layer on the substrate 111 first to form a touch pad, the PEDOT layer conductive patterns 113: 113a, 113b, 113b' are formed by direct printing, but at least a portion of the conductive pattern, that is, The conductive pattern 113b' of the extension portion and the connecting portion is formed such that a plurality of individual patterns to be finally spaced apart from each other are integrally formed in the form of a net conductive pattern, that is, a tube pattern 113b'.

Then, after the ink pattern is dried, a plurality of individual patterns 113b" separated from each other as shown in FIG. 4 are removed by removing the PEDOT layer filling the space between the plurality of individual patterns through laser irradiation in a subsequent step. It goes through the forming process.

In a subsequent step for forming the touch pad, a protective layer barrel pattern made of carbon paste is formed on a connection portion where individual terminal patterns are already formed, as shown in FIG. 5. Such a protective layer barrel pattern can be formed by various printing methods.

Then, after the ink or paste state protective layer barrel pattern 115 is dried, by removing the carbon paste reinforcing layer filling the separation space between the plurality of individual patterns through laser irradiation, a plurality of segments separated from each other as shown in FIG. The process of forming the protective layer individual patterns 115' is performed.

Looking at the reason for forming and protecting and reinforcing the carbon-containing material layer, such as a carbon paste, on the PEDOT layer terminal pattern of the connection part, in order to electrically connect the touch pad with the control board, the connection part must be exposed due to its own characteristic that the conductive pattern must be exposed The non-conductor is removed, and when the PEDOT layer is exposed to air, surface oxidation occurs to increase resistance in electrical connection with the control board.

Accordingly, a conductive protective layer that prevents the surface of the PEDOT layer conductive pattern from directly contacting air is formed on the surface of the PEDOT layer conductive pattern.

The carbon paste layer has high adhesion to the PEDOT layer, and on the one hand, it can suppress the increase in electrical resistance compared to other protective materials, and on the other hand, it is not only oxidized through physical reinforcement, but also external objects, such as pins of the connector of the connector of the other party It is also possible to prevent the PEDOT layer conductive pattern from being damaged by contact with the same object, thereby increasing the electrical connection resistance.

Subsequent fixing may be performed through a process similar to the conventional method for forming a touch pad. That is, the overcoat film 117 is entirely stacked on the substrate over the PEDOT layer conductive patterns 113a, 113b, 113b" in which the individual patterns are separated and the protective layer individual patterns 115', and the OCA layer ( 119).

However, as shown in the cross-sectional view of Fig. 7, the conductive pattern 113b" and the protective pattern 115' of the connection portion are exposed to the outside. To this end, when forming a film over the conductive pattern, only the area excluding the connection portion is printed. Alternatively, an overcoat film 117 or an OCA layer 119 may be formed, or after forming an overcoat film or an OCA layer on the entire surface, a method of removing these films of the connection portion through photolithography may be used.

When the touchpad is formed through a series of processes including such a process, the touchpad and the display panel are aligned and combined, and on the other hand, electrical connection is performed so that the touchpad connection terminal terminals and the connector terminal of the control board correspond exactly. . Usually, the control board is connected to a processing unit or a computer, and the processing unit composes a display screen and operates by receiving a touch pad signal, so that the touch panel is comprehensively driven.

In the above embodiment, when the PEDOT layer conductive pattern is formed, the conductive pattern 113b' of the extension portion and the connection portion is formed as an initial cylinder pattern, and is divided into individual patterns 113b" by laser irradiation, followed by carbon paste for the connection portion. It is described that the protective layer barrel pattern 115 is formed and the carbon paste protective layer individual pattern 115' is formed by laser processing, but the carbon paste barrel pattern is obtained without dividing the barrel pattern of some areas of the PEDOT layer into individual patterns. To form an individual pattern of carbon paste through primary laser irradiation on the carbon paste barrel pattern, and then to form a PEDOT barrel pattern through secondary laser irradiation on the exposed PEDOT layer barrel pattern. The process of forming and dividing into individual patterns may be sequentially performed in some cases. In some cases, these layers may be formed as individual terminal patterns at once through a strong laser irradiation on the carbon paste tube pattern and the PEDOT layer tube pattern at the connection portion. It is possible.

To explain this embodiment in more detail, the substrate 111 is a substrate made of a flexible film that can be easily bent or bent, and is made of a durable and durable polyethylene terephthalate (PET) material to form the base of the touchpad. Achieve. In addition to PET as a substrate material, polycarbonate (PC:polycarbonate) with excellent light resistance, heat resistance, impact strength, and insulation, polypropylene (PP) with low specific gravity and abrasion resistance, polyethylene with excellent chemical resistance and water resistance (PE: Polyethylene), various materials such as acrylonitrile butadiene styrene (ABS), which are excellent in hardness, chemical resistance, heat resistance, gloss, insulation, and ductility can be used.

The shape of the substrate can also be cut into any shape. Here, since the substrate itself is flexible, even if a separate flexible printed circuit board (FPCB) is not interposed between the substrate and the control board, a part of the touch pad is extended to extend from the portion covering the display screen similar to the FPCB when mounted on the dashboard. It is formed to have a portion 210 and is also partially bent so that the touchpad can be easily directly connected to a control board embedded in another spaced apart space.

On the surface of the substrate 111 constituting the touchpad, a conductive pattern, that is, a touch pattern 113a, a connection pattern 113b of the substrate body region, an individual pattern 113b" in which the substrate extension region connection pattern and the connection region terminal pattern are fused. It is installed in this printing method, where the conductive pattern is made of a PEDOT layer.

A connection portion 211 in which a plurality of individual terminals are formed to be connected to the control board is provided at an end of the extension portion 210 protruding from the body portion of the substrate 111 having the touch area. In this extension portion 210, individual connection wires or individual patterns 113b", which connect the individual touch areas and the corresponding connection portion 211 terminals distributed throughout the touch panel, are all gathered and progress parallel to each other with a narrow gap. Is showing.

PEDOT stands for poly 3,4-ethylenedioxythiophene and is commonly used in the form of a polymer mixture of two ionomers called PEDOT:PSS (poly 3,4-ethylenedioxythiophene: polystyrene sulfonate). PEDOT is a kind of conductive polymer and can be made in a liquid form such as ink to easily implement a conductive pattern in a printing method. This conductive pattern has the advantage of being lightweight, sturdy, and bendable and has high chemical durability.

Inks or pastes for forming a PEDOT layer or a carbon-containing member protective layer are often low in viscosity, and may cause short circuits between PEDOT layer patterns due to spreading during printing, and thickness variations in the printing area may occur. .

As a method to alleviate this problem, a corona treatment or plasma treatment may be performed on the PET substrate 111, or a coating film may be installed to reduce the surface tension due to the material characteristics of the substrate surface, and the printing equipment itself can be printed clearly. High-end printing equipment can be adopted to increase

In the above embodiments of the present invention, in order to solve this problem, in particular, in forming the PEDOT layer and the carbon-comprising member protective layer pattern, individual patterns are densely formed and spaces between each other are narrow, that is, the extension portion 210 and the connection portion ( Laser irradiation to form an integrated tubular pattern 113b' without gaps between individual conductive patterns through printing at 211) and to separate the individual patterns 113b" from the region of the extension 210 where the tubular pattern is formed Will be conducted.

In such a laser irradiation process, the PEDOT layer or the protective layer is vaporized and volatilized by heat in the region where the laser is irradiated, so that the substrate is exposed without leaving the conductive layer. To this end, the laser light of appropriate intensity calculated by considering the characteristics of the PEDOT layer and the protective layer and the surrounding environment such as thickness, temperature, etc. moves at an appropriate speed and is irradiated for an appropriate period of time to apply an appropriate level of energy per unit area. do.

For efficient irradiation of laser light, laser light scanning means such as changing the irradiation position of the laser light reflected from the mirror surface can be used by combining a micromirror on the piezoelectric body and changing the mirror direction by the applied voltage. Accurate alignment between the substrate and the laser trajectory must be done to heat the correct position. Since scanning of laser light using a digital micromirror is a well-known technique, a detailed description thereof will be omitted.

As described above, in the present invention, it is difficult to form a pattern that precisely separates a protective layer by printing due to material characteristics when forming a protective layer by printing to form a plurality of individual patterns in a relatively narrow and narrow connection portion. Rather than printing the individual connecting lines in a separated state, they are formed into a wide tub pattern (thong pattern) that is not distinguishable from the beginning.

Then, in a subsequent step, laser irradiation is performed in a batch to remove the protective layer filling the area between the individual patterns so that the individual patterns and the individual patterns are separated from each other.

This method reduces the cost burden associated with the use of expensive printing equipment because it does not require precise printing of the pattern compared to the case where individual patterns are printed separately from the beginning, and the process cost is not required to strictly manage the process conditions. And reduce the administrative burden.

In addition, even when printing individual patterns separately, there is still a possibility that a short circuit between adjacent patterns is still realistic, and it is a hassle to check the location of the short circuit through inspection, and irradiate a laser to the location to repair the defect. However, in the present invention, since the laser irradiation is performed in a batch, the process of inspecting the location where a short circuit is generated can be reduced, and the process can be reduced, and the overall process stability can be improved and the defect rate can be lowered by preventing defects from the limitation of inspection. have.

Of course, in the present invention, the conductive pattern can be formed relatively simply by a printing method using a PEDOT layer compared to forming a conventional ITO layer conductive pattern, compared to forming through a complicated process using expensive vacuum equipment and photolithography equipment. Can significantly lower the process cost,

The individual pattern of the PEDOT layer at the connection part is protected with a carbon-containing protective layer to prevent oxidation or physical damage, thereby keeping the electrical resistance low to stabilize the transmission of the touch signal. At this time, when the individual pattern of the protective layer is separately formed through laser irradiation Also, it is possible to reduce the problem of misalignment of the printing apparatus and the substrate in the printing process.

On the other hand, unlike the ITO film touch pad in which ITO is pre-sprayed in the present invention, PEDOT is a viscous liquid material, which can be printed on it by selecting a suitable PET substrate according to the purpose of use, and can adjust the resistance according to conditions. It is also possible to adjust the partial touch sensitivity according to the state of the injection material.

After the individual conductive patterns are separately formed through laser irradiation, an overcoat layer 117 for physically protecting and electrically insulating the conductive patterns from external damage is stacked over the entire substrate. However, the overcoat film 117 is removed from the connection portion 211 so that the conductive terminal is exposed.

And, over the overcoat layer 117, a transparent adhesive film (OCA:Optically clear adhesive: 119) is attached on the touch panel for attaching other substrates constituting a window or a touch pad, while the connection part 211 is controlled. A stiffener (311) is installed on the lower surface of the substrate 111 to maintain the recommended thickness and stiffness of the connector when it is inserted and connected to the connector of the board in a slide manner.

In addition, the protective layer including carbon in the connection portion 211 may also serve to visually distinguish a portion inserted in a slide manner into a connector (not shown) of the control board.

According to the present invention, it is also possible to omit the FPCB and the ACF accordingly by using a PEDOT-based conductive polymer capable of bending and bending the substrate when formed on a substrate. In particular, due to product characteristics, heat resistance and chemical resistance are excellent, resulting in changes in temperature and humidity. It is easy to control the touch without malfunction inside the severe vehicle, and it is possible to improve the stability of the vehicle LED backlight light based on the high transmittance.

In the above, the present invention has been described through limited embodiments, but the present invention is merely illustrative to assist in understanding the present invention, and the present invention is not limited to these specific embodiments.

Accordingly, a person having ordinary knowledge in the field to which the present invention pertains can implement various modifications and application examples based on the present invention, and it is natural that such modifications and application examples belong to the appended claims.

11, 111: substrate 13: ITO layer
15: silver paste layer 17, 117: overcoat film
19, 119: OCA layer 20: connection
30: flexible printed circuit board (FPCB) 40: control board
113: Challenge pattern 113a: Touch pattern
113b: connection pattern (connection pattern of the main body of the substrate)
113b': barrel pattern (substrate extension connection pattern and connection terminal conductive pattern)
113b": individual pattern (substrate extension connection pattern and individual pattern of connection terminal)
115: protective layer barrel pattern 115': protective layer individual pattern
210: extension 211: connection

Claims (6)

It has a display device, a touch pad having a flexible transparent substrate, which is attached to and coupled to the display device screen and has a conductive pattern formed in a printing method, and a control board connected to the touch pad,
The conductive pattern is composed of a single layer of an integrated PEDOT-based conductive polymer.
The terminal for connection with the control board in the connection part of the touch pad is provided with a conductive protective layer made of a carbon-containing material on the conductive polymer, the touch panel for a vehicle dashboard. According to claim 1,
The protective layer individual pattern 115' of the conductive protective layer provided on the terminal of the connection part is printed with a protective layer barrel pattern 115 covering all of the plurality of individual terminals constituting the terminal, and then the individual terminals through laser irradiation. Touch panel for a vehicle dashboard, characterized in that made by removing the conductive protective layer from the separation portion. According to claim 2,
At least a part of the conductive pattern is laser printed after printing with a plurality of individual patterns 113b" adjacent to the flexible transparent substrate and a tubular pattern 113b' covering all the spaces between the plurality of individual patterns 113" Touch panel for a vehicle dashboard, characterized in that made by removing the conductive polymer from the separation between the plurality of individual patterns (113b") through irradiation. The method according to any one of claims 1 to 3,
The conductive pattern is divided into a touch pattern constituting a touch area, a terminal pattern formed in the connection part for connection with the control board, and a connection pattern connecting the touch pattern and the terminal pattern,
A touch panel for a vehicle dashboard, characterized in that a separate FPCB and ACF is not mediated between the connection part and the control board, and the connection part and a terminal of the control board are directly connected. In forming the touch panel for a vehicle dashboard of claim 1,
The conductive pattern of the touch pad attached to the screen of the display device is formed of a PEDOT-based conductive polymer in a printing method,
Forming a conductive protective layer made of a carbon-containing material on a conductive polymer constituting the terminal in the connecting portion in a cylindrical pattern by a printing method,
It characterized in that it comprises a separation step to remove the conductive protective layer in the region between the individual terminals constituting the terminal by performing a laser irradiation on the barrel pattern made of the conductive protective layer to make the distinction between the individual terminals Touch panel for vehicle dashboard. The method of claim 5,
When forming the conductive pattern, the connection portion is formed into a tube pattern 113b',
Before forming the conductive protective layer into the protective layer through pattern 115, the individual corresponding to the individual terminals together through a separate laser irradiation or through the laser irradiation in the distinguishing step of distinguishing the protective layer through pattern 115 Touch panel for a vehicle dashboard, characterized in that separated by a pattern (113b").

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