KR20080040828A - Manufacturing method of electrode terminal part of polymer dispersed liquid crystal display - Google Patents

Abstract

A method for manufacturing an electrode terminal unit of polymer dispersed LCD(Liquid Crystal Display) is provided to prevent deformation of a conductive film and terminal faults caused by a high temperature connection process, and prevent assembling faults and exposure of an electric wire, thereby removing danger of an electric shock and disconnection. A conductive film is formed by coating ITO(Indium Tin Oxide) on a thin plastic film. Between the two sheets of conductive films, a PDLC(Polymer Dispersed LC) is coated and injected to configure a PDLC panel(5). One sheet of the two conductive films and a part of the PDLC are half-cut to be removed. A cut unit is formed by cutting a part of the rest one conductive film. On an ITO upper part of the rest one conductive film where the cut unit is formed, conductive material such as silver paste is coated. A conductive copper tape(19) is attached to an upper part of the conductive material so as to cross the cut unit. Therefore, a terminal unit(T) is formed. In a middle portion of the copper tape crossing an empty space of the cut unit, an external wire is connected.

Description

Method for manufacturing electrode terminal in polymer dispersed liquid crystal display

1 is a cross-sectional view showing a conventional polymer dispersed liquid crystal display device.

Figure 2 is a plan view showing a conventional polymer dispersed liquid crystal display device.

Figure 3 is an enlarged cross-sectional view of the electrode terminal portion of the conventional polymer dispersed liquid crystal display device.

4 is a plan view showing various embodiments of the conventional electrode terminal portion.

5 is an enlarged plan view illustrating various embodiments of an external connection line of a conventional electrode terminal unit;

6 is a plan view showing a finished product of a conventional polymer dispersed liquid crystal display device.

7 to 9 are views illustrating a method for manufacturing an electrode terminal portion of a polymer dispersed liquid crystal display of the present invention.

10 is a plan view showing various embodiments of the electrode terminal portion according to the present invention.

11 is a plan view showing a finished product of the polymer dispersed liquid crystal display device according to the present invention;

The present invention relates to a method for manufacturing an electrode terminal portion of a polymer dispersed liquid crystal display device, and particularly, to cut a portion of an upper and lower conductive film coated with an electrode to form a cut portion, and to form an electrode terminal portion to cross the cut portion. By connecting an external electric wire to the electrode terminal part, it is possible to prevent the deformation of the conductive film and the terminal defect due to the high temperature connection process, to prevent the assembly failure, to prevent the damage of the electrode due to the local crimping during the glass bonding process, and The present invention relates to a method for manufacturing an electrode terminal portion, which can prevent external exposure of the electrode to eliminate the risk of electric shock and disconnection.

The polymer dispersed liquid crystal display device solves the problems of the existing liquid crystal display with multiple free technologies such as rubbing free, polarizing plate free, backlight free, substrate free, etc., by forming and dispersing liquid crystal droplets using a polymer as a matrix. Information is displayed in the form of scattering or absorbing light in response to a voltage applied from the outside.

The polymer dispersed liquid crystal display device forms a conductive film by coating an ITO electrode on a thin plastic film, and a polymer dispersed liquid crystal (PDLC) formed by coating a polymer dispersed liquid crystal between the upper and lower conductive films thus formed. Polymer Dispersed Liquid Crystal) can be used in the form of a panel, and is also a structure in which two glass substrates are bonded to the upper and lower parts in various structures for various purposes.

1 and 2 show an example of a polymer dispersed liquid crystal display. In Figure 2, the cross-section of the polymer dispersed liquid crystal display device is made of a glass substrate (1) 3 ~ 20mm, laminated film (EVA or PVB) (3) 0.2 ~ 2mm, PDLC panel (5) 100 ~ 500μm, and A gap between the PDLC panels 5 in the glass border (left end of the drawing) is formed about 5 to 15 mm.

The polymer dispersed liquid crystal display device formed as described above requires electricity required for driving due to the characteristics of the product, and thus, an electrode terminal (electrode) must be formed and connected to the outside. At this time, since the position of the wire varies depending on the product, the position of the terminal may be located on either side.

Since the four sides of the PDLC panel 5 are completely sealed by the bonding film 3 after the glass substrate 1 is bonded, the PDLC panel 5 before the bonding process because there is no way to connect the wires from the outside. The electrode terminal portion exposed to the outside to be connected to the external wire 7 is required.

The electrode terminal manufacturing method of the PDLC panel 5 has the following method.

As shown in FIG. 3, the PDLC panel 5 coats the ITO 11 on a plastic film 9 such as PET (PET, polyethylene terephthalate) to form a conductive film (or ITO pet film) 13. Then, the polymer dispersed liquid crystal 15 is coated, injected, and assembled between the two conductive films 13 formed as described above to be integrated, and then cut into a desired size.

The PDLC panel 5 manufactured as described above forms an electrode terminal portion T so as to transfer current applied from the driving circuit to the upper and lower ITO 11, which is one of two overlapping conductive films 13. The medium and a portion of the polymer dispersed liquid crystal 15 are cut and removed together (as shown in FIG. 3), and the silver paste is coated on the ITO 11 of the remaining conductive film 13 using a silk screen printing technique or the like. (17) or other corresponding conductive material, and the conductive copper tape 19 and other corresponding materials are attached thereto to form the terminal portion T.

Since the electrode terminal portion T of the PDLC panel 5 should be configured on the ITO 11 of the upper and lower conductive films 13, respectively, a method of simultaneously configuring two terminal portions on one side and terminals on the other side, respectively. It can be manufactured by various methods, such as how to configure.

As a method of connecting a power source from the outside to the electrode terminal portion T manufactured as described above, as shown in FIG. 5, a method of making the existing copper tape 19a longer or larger than the PDLC panel 5 to protrude to the outside, A method of attaching a copper mesh 19b or a corresponding material to the copper tape 19 by an ultrasonic method or other soldering method, or a flexible printed circuit (FPC) on the copper tape 19 ( 19c).

As shown in FIG. 6, the PDLC panel 5 having the electrode terminal portion T is bonded between two glass substrates 1 and connected to a power source by an external wire 7 to disperse the original polymer. Function as a type liquid crystal display device.

However, in the above-described conventional polymer dispersed liquid crystal display device, the structure of the electrode terminal portion has a problem in that the safety is lacking due to the exposure of the terminal portion and the external wire for the external power connection.

The driving voltage of PDLC panel is about 10 ~ 240V, which is higher than that of general liquid crystal display. In this way, the insulation problem becomes important according to the use of high voltage. In the conventional external terminal structure, copper tape, wire mesh, and FPC are exposed to the outside, and there is a risk of electric shock. Another work is added, such as the need to insulate, there is a problem that the work efficiency is reduced.

In addition, in the case of conventional wire terminal, copper tape, or FPC, which is used as a conventional external connection line, the durability is inferior, and there is a risk of disconnection when a plurality of force is applied. If the product is disconnected, it will not be possible to recover the product.

In addition, conventional electrode terminal parts need soldering to connect external wires to copper wire, copper tape, and FPC, which are used as external connection wires. have.

In order to solve the problems of the prior art, the present invention eliminates the copper wire, copper tape and FPC that was used as an external connection line in the prior art to eliminate the risk of electric shock or disconnection and improve workability, in particular of the external connection structure Its purpose is to prevent exposure and direct application of high temperature to the conductive film to prevent deformation and poor connection, and to simplify the connection work and improve workability.

According to the above object, in the present invention, ITO is coated on a thin plastic film to form a conductive film, and a polymer dispersed liquid crystal is coated and injected between two conductive films thus formed to form a PDLC panel. Thereafter, one of the two conductive films and a portion of the polymer dispersed liquid crystal are half-cut together and removed, and a portion of the remaining one conductive film is cut out to form a cut portion, and the remaining one conductive film having the cut portion formed thereon. A conductive material such as silver paste is coated on the upper portion of the ITO of the conductive material, and a conductive copper tape is attached on the upper portion of the conductive material to cross the cutting portion to form a terminal portion. The present invention proposes a method for manufacturing an electrode terminal of a polymer dispersed liquid crystal display device, which comprises connecting and connecting glass substrates to upper and lower portions thereof.

Two electrode terminals may be configured simultaneously on one side of the PDLC panel, or on the other side.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

7 to 9 illustrate a method of manufacturing electrode terminals of the polymer dispersed liquid crystal display of the present invention.

Referring to the steps of the electrode terminal manufacturing method of the present invention with reference to the drawings as follows.

First, the manufacturing method of the PDLC panel 5 is the same as before. That is, ITO is coated on a thin plastic film such as PET (PET, polyethylene terephthalate) to form a conductive film (or ITO pet film) 13, and the polymer is dispersed between two conductive films 13 thus formed. Coating, injecting and assembling the type liquid crystal 15, and then cut to the desired size.

The PDLC panel 5 manufactured as described above forms the electrode terminal portion T for the current flow applied from the driving circuit for driving. In particular, in the present invention, unlike the prior art, a structure capable of preventing exposure of an external connection line is prevented. Is made of.

That is, in the present invention, one of the two upper conductive films 13 (upper substrate) and the polymer dispersed liquid crystal 15 are half cut together and removed from the two conductive films 13 stacked in one step. In the second step, a part of the remaining conductive film 13 is cut off to form the cut portion 21.

The cutting unit 21 may be applied in various ways and shapes according to the situation.

For example, as shown in FIG. 8A, the end of the cutting portion 21 is formed to coincide with the upper conductive film 13, or as shown in FIG. 8B, a slight gap between the cutting portion 21 and the upper conductive film 13. The gap may be formed to be maintained. In this case, the latter method is preferable in order to prevent defects caused by contact of the upper and lower conductive films 13.

In the third step, the silver paste 17 or other corresponding conductive material may be applied to the upper portion of the ITO of the remaining conductive film 13 having the cutout portion 21 (lower substrate) by using a silk screen printing technique or the like. Coating.

In step 4, the conductive copper tape 19 and other corresponding materials are attached to the upper portion of the silver paste 17 to form the terminal portion T.

At this time, the silver paste 17 of the 'three steps' is formed in the remaining portion except for the cutting portion 21, the copper tape 19 is made in the form of connecting the empty space of the cutting portion 21 to cross.

Since the electrode terminal portions T of the PDLC panel 5 should be respectively configured on the upper and lower conductive films 13, a method of simultaneously configuring two terminal portions T on one side and terminal portions T on the other side as shown in FIG. Can be manufactured in various ways depending on the situation such as

As shown in FIG. 9, an external electric wire 7 is placed in the middle of the copper tape 19 positioned on the empty space of the cutting portion 21 as a method of connecting a power source from the outside to the electrode terminal portion T thus manufactured. Connect At this time, the external wire 7 is a normal coated wire, the soldering portion of the wire and the copper tape 19 is located inside the polymer dispersed liquid crystal display device is not exposed to the outside.

As shown in FIG. 11, the PDLC panel 5 including the electrode terminal portion T is bonded between two upper and lower glass substrates 1 and is external to two terminal portions T simultaneously formed on one side. By connecting the electric wire (7) to form a power source is to perform the function as the original polymer dispersed liquid crystal display device product.

As can be seen through the embodiments described above, according to the method of manufacturing the electrode terminal portion of the polymer dispersed liquid crystal display device of the present invention, the deformation of the conductive film and the terminal failure by the high temperature connection process is prevented, In addition, the external exposure of the wires can be prevented to reduce the risk of electric shock and wire breakage.

That is, in the related art, when soldering to an external exposed connection line, high temperature may cause deformation and defects of the PDLC panel and the terminal part, and also due to the thickness of the external wire, It is easy to generate a deformation | transformation. However, according to the present invention, there is no heat directly transmitted to the PDLC panel or the terminal part, so that the external electric wire and the electrode terminal part can be safely connected, and the tension is applied because the electrode terminal part, ie, the copper tape, which is directly connected to the external electric wire is not fixed. Since it does not absorb the force generated from the outside, and the external electric wire is located in the empty space of the cut portion, it is possible to prevent the step difference due to the thickness and poor bonding.

In addition, in the past, soldering and other methods were required to connect the external connection line and the external wire after the glass substrate bonding of the PDLC panel, which required highly skilled work, but according to the present invention, the same type of power line may be connected to the external wire. Ease of operation can be achieved.

In addition, in the conventional PDLC panel, external connection wires such as FPC, copper tape, and wire mesh are directly exposed to the outside, and there is a risk of electric shock through it. In order to prevent this, insulation work such as separate protection means has been involved. According to the present invention, since external wires (coated wires) that are generally used are exposed to the outside, they are insulated by themselves, can prevent electric shock accidents, can prevent broken wires, and simplify the work process that occurs later. Can be.

Claims (3)

Coating ITO on a thin plastic film to form a conductive film, and coating and injecting a polymer dispersed liquid crystal between two conductive films thus formed to form a PDLC panel; Half-cutting and removing a portion of the two conductive films and a portion of the polymer dispersed liquid crystal together; Cutting a portion of the remaining conductive film to form a cutting portion; Coating a conductive material such as silver paste on the ITO of the remaining conductive film having the cut portion formed thereon; Forming a terminal portion by attaching a conductive copper tape over the cutting portion on top of the conductive material; A method of manufacturing an electrode terminal portion of a polymer dispersed liquid crystal display device comprising the step of connecting an external wire to the middle of the copper tape across the empty space of the cutting portion. The method of claim 1, wherein two terminal parts are simultaneously configured on one side of the PDLC panel, or two are respectively configured on the other side of the PDLC panel. The method of claim 1, wherein a glass substrate is bonded to upper and lower portions of the PDLC panel to which external wires are connected.

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