KR20110025410A - Method for manufacturing display device substrate - Google Patents

Abstract

PURPOSE: A manufacturing method of a substrate for a display device is provided to accurately perform the installation arrangement of a thin film transistor by easily forming ITO or carbon nano tube electrode on a substrate. CONSTITUTION: An electrode is formed in one side of a release film(S110). A surface is attached on a surface on which the electrode of the release film is formed(S120). The electrode is separated from the substrate(S130). The formed electrode is ITO or carbon nano tube electrode. The ITO or the carbon nano tube electrode is formed on the release film. The transparent electrode is easily formed in a substrate.

Description

Method for manufacturing substrate for display device {Method for Manufacturing Display Device Substrate}

The present invention relates to a method for manufacturing a substrate for a display device, and more particularly, to a method for manufacturing a substrate for a display device that can form a transparent electrode pattern of conductive ITO or carbon nanotubes on a substrate using a release film. will be.

In the information society, display devices are being emphasized as visual information transmission media, and in order to preempt important positions in the future, it is required to satisfy requirements such as low power consumption, thinness, light weight, and high quality.

As such display devices, liquid crystal displays (LCDs), plasma display devices (PDPs), organic light emitting diodes (OLEDs), and the like have been developed and used.

The organic light emitting diode is a self-luminous display device using a phenomenon in which electrons and holes injected through an anode and a cathode are recombined into an organic thin film to form an exciton, and light of a specific wavelength is generated by energy from the formed exciton. As the transparent electrode of the TFT substrate, indium tin oxide (ITO) or carbon nanotube (CNT) sputtered on the substrate is mainly used.

Conventionally, in order to manufacture a TFT substrate, a circuit is formed in a stacked manner, and each layer is laminated (masking process), and a pattern necessary for each mask is coated onto the actual substrate, photolithography, and developing. The process of making a shape was performed through the process.

Photo-lithography was used in the exposure process, and sulfur hexafluoride (SF6) was mainly used in dry etching, one of etching processes. SF6 is a kind of gas that causes global warming. It is classified as an environmental hazard and manufactured a TFT substrate using a roller method to limit its use.

1 is a view showing an electrode forming method using a conventional roller.

The electrode 30 contained in the pattern groove 25 is transferred to the substrate 10 by contacting and rotating the pattern roller 20 in which the electrode-shaped pattern groove 25 is formed on the substrate 10. ) Was formed. However, the accuracy of the electrode 30 is reduced during the formation of the electrode 30 and the shape of the electrode is changed due to the sliding action of the pattern roller 20 and the pressure between the pattern roller 20 and the substrate 10. There is a problem (see A).

The present invention has been made to solve the above problems, it is easy to manufacture by forming the ITO or carbon nanotube electrode on the substrate using a release film, easy to manufacture, high cost and high production efficiency, installation of a thin film transistor It is an object of the present invention to provide a method for manufacturing a substrate for a display device that can accurately perform an arrangement.

Method of manufacturing a substrate for a display device according to the present invention provided to achieve the above object comprises the steps of forming an electrode on one surface of the release film (S110); Attaching a surface on which the electrode of the release film is formed to a substrate (S120); Separating only the release film from the substrate while the electrode is transferred to the substrate (S130); UV curing the substrate (S140); And firing the substrate (S150); wherein the electrode is an ITO or carbon nanotube electrode.

Here, the step S110, the step of supplying the electrode resin to the resin supply roller; Transferring the electrode resin to the pattern groove of the pattern forming roller which is rotated in contact with the resin supply roller while the resin supply roller rotates; Transferring the electrode resin accommodated in the pattern groove to the outer circumferential surface of the blanket roller which is rotated in contact with the pattern forming roller while the pattern forming roller rotates; And transferring the patterned electrode resin to one surface of the release film passing between the pressing rollers which rotate in contact with the blanket roller while the blanket roller rotates to form an electrode.

The manufacturing method may further include curing the electrode resin pattern by irradiating ultraviolet (UV) to the blanket roller after the step of delivering the electrode resin contained in the pattern groove to the outer peripheral surface of the blanket roller. .

In addition, in the step S110, the electrode resin is supplied to a forming roller in which a forming groove of a pattern corresponding to the electrode is formed, and the release film is formed between a pair of pressure rollers connected to both sides of the forming roller and an outer circumferential surface of the forming roller. In the process of moving the release film while being in close contact with the outer peripheral surface of the molding roller to pass through the electrode resin in the molding groove of the molding roller to be continuously transferred to the release film, the electrode on the release film It is preferable to form continuously.

In addition, one side of the pattern forming roller is preferably provided with a scriber to scrape so that the electrode resin does not remain in the portion other than the pattern groove.

In addition, the ITO or carbon nanotube electrode is preferably formed by mixing with the UV curable resin or thermosetting resin.

According to the method for manufacturing a substrate for a display device according to the present invention, a transparent electrode can be easily formed by forming an ITO or carbon nanotube electrode on a release film and transferring the resultant to a substrate, thereby achieving high production efficiency. In addition, the use of process masks can be reduced to reduce costs, and the arrangement of thin film transistors can be accurately performed. In addition, there is an effect that the printing shape is stabilized and the height error of the electrode is reduced.

The above objects, features and other advantages of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings. Hereinafter, a method of manufacturing a substrate for a display device having an ITO or carbon nanotube electrode according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view illustrating a structure of an organic light emitting diode (OLED) substrate as an example of a substrate for a display device having an ITO or carbon nanotube electrode according to the present invention.

2, the display device substrate 1 of the present invention is coated with a resin layer 2 (resin layer) on the substrate 1, ITO or carbon nano having a predetermined pattern on the resin layer (2) The tube electrode 4 is formed. The substrate 1 may be one having a rigid property such as a glass or plastic substrate, but is preferably made of a flexible film material having properties such as bending and folding. The resin layer 2 is for attaching the ITO or carbon nanotube electrode 4, and may be made of an adhesive having the adhesiveness of the resin layer 2 itself.

In the organic light emitting diode (OLED) of FIG. 2, ITO is widely used as a transparent electrode material for emitting emitted light to the outside. Although ITO has higher resistance than ordinary metals, ITO is transparent and has high hole injection efficiency and surface resistance. This is because it has a low property.

In addition, the carbon nanotube electrode is formed by applying carbon nanotubes having metallic properties of single-walled nanotubes (SWNTs) or multiwalled nanotubes (MWNTs).

As is well known, carbon nanotubes are carbon allotrope made of carbon, and carbon is formed in the shape of tube by combining one carbon atom with hexagonal honeycomb pattern with other carbon atoms. Is a very small area of matter. These carbon nanotubes are about 1000 times more conductive than copper (Cu) and are 100 times stronger than steel. In addition, the carbon fiber is broken even when only 1% deformation, it is known that the carbon nanotubes have a characteristic to withstand 15% deformation.

Since carbon nanotubes have such excellent electrical, thermal, and mechanical properties, they are applied to a wide variety of fields such as lithium ion batteries, hydrogen storage fuel cells, nanowires, nanocapsules, and nano tweezers. It is also applied to display devices such as (FED: Field Emission Display).

The substrate 1 for a display device having the ITO or carbon nanotube electrode 4 according to the present invention is coated with an ITO or carbon nanotube electrode on the substrate 1 of the organic light emitting diode (OLED) using a release film. It is produced in a desired pattern by the work.

Hereinafter, embodiments of the method of manufacturing the substrate 1 for a display device having the ITO or carbon nanotube electrode 4 according to the present invention will be described in detail.

3 is a flowchart illustrating an embodiment of a method of manufacturing the organic light emitting diode substrate 1 of FIG. 2, and FIG. 4 is a substrate for a display device having an ITO or carbon nanotube electrode 4 according to the present invention. 1) schematically showing an embodiment of the method for forming the ITO or carbon nanotube electrode 4 on the release film (F) of the manufacturing method of Figure 5, Figure 5 is an ITO or carbon nanotube electrode according to the present invention ( FIG. 6 schematically shows another embodiment of the method for forming the ITO or carbon nanotube electrode 4 on the release film F in the method of manufacturing the substrate 1 for display device having the display device 4. Transfer of the ITO or carbon nanotube electrode 4 formed on the release film (F) to the substrate 1 in the manufacturing method of the substrate 1 for display device having the ITO or carbon nanotube electrode 4 according to the present invention It is a schematic diagram showing an embodiment of a method.

As shown in FIG. 3, in the method of manufacturing the substrate 1 for a display device having the ITO or carbon nanotube electrode 4 according to the present invention, the ITO or carbon nanotube electrode 4 is formed on one surface of the release film F. FIG. ) (S110), the step of attaching the surface on which the ITO or carbon nanotube electrode 4 of the release film (F) is formed (S120), the ITO or carbon nanotube electrode (4) Separating only the release film F from the substrate 1 in a state transferred to the substrate 1 (S130), UV-curing the substrate 1 (S140), and the substrate 1 to the heating apparatus. It consists of the step of baking (S150).

The first step (S110) uses an ITO or carbon nanotube electrode forming apparatus 110 that combines an offset technique and a roller scribing technique as shown in FIG. 4. It can be done by.

Specifically, the ITO or carbon nanotube electrode forming apparatus 110 for forming the ITO or carbon nanotube electrode 4 on the release film F is a resin containing ITO or carbon nanotube electrode resin 4a. Resin supply roller 112, the resin supply roller 112 is rotatably installed on the upper side of the supply unit 111, the resin supply unit 111, and the outer peripheral surface of the lower end is immersed in the ITO or carbon nanotube electrode resin 4a contained in the resin supply unit 111, resin supply It is installed in contact with the upper side of the roller 112 and the pattern groove 114 of the pattern corresponding to the ITO or carbon nanotube electrode 4 is formed on the outer peripheral surface to the inside of the pattern groove 114 from the outer peripheral surface of the resin supply roller 112 It is installed in the pattern forming roller 113, the upper side of the pattern forming roller 113 to receive the resin to transfer the ITO or carbon nanotube electrode resin (4a) from the pattern groove 114 of the pattern forming roller 113 The image of the receiving blanket roller 115 and the blanket roller 115 Pressure to release the release film (F) which is installed in contact with and passes through the outer circumferential surface of the blanket roller (115) against the blanket roller (115) to bond the ITO or carbon nanotube electrode resin (4a) to the release film (F). And a roller 116.

On one side of the pattern forming roller 113, the scriber 117 scraping off so that the ITO or carbon nanotube electrode resin 4a applied to the outer surface of the pattern forming roller 113 does not remain in portions other than the pattern groove 114. Is installed. A UV curing apparatus 118 is provided to cure ITO or carbon nanotube electrode resin 4a by irradiating ultraviolet (UV) to the outer circumferential surface of the blanket roller 115.

The process of forming the ITO or carbon nanotube electrode 4 on the release film F by the ITO or carbon nanotube electrode forming apparatus 110 configured as described above is as follows.

When the resin feed roller 112 rotates, ITO or carbon nanotube electrode resin 4a provided inside the resin feed part 111 is coated on the outer circumferential surface of the resin feed roller 112. At this time, the pattern forming roller 113 is rotated in the opposite direction to the resin supply roller 112 receives the ITO or carbon nanotube electrode resin (4a) applied to the resin supply roller 112.

The ITO or carbon nanotube electrode resin 4a transferred to the pattern forming roller 113 passes through the scriber 117, and portions coated on the outside of the pattern groove 114 are removed and accommodated inside the pattern groove 114. Only will remain. The surface energy of the ITO or carbon nanotube electrode resin 4a housed inside the pattern groove 114 of the pattern forming roller 113 is in contact with the blanket roller 115 relative to the pattern forming roller 113. As a result, it is moved to the outer circumferential surface of the high blanket roller 115.

The ITO or carbon nanotube electrode resin 4a transferred to the blanket roller 115 is cured by the UV curing apparatus 118 to have a certain viscosity, and then, between the pressure roller 116 and the blanket roller 115. It is bonded to one surface of the release film (F) passing through.

As described above, when the ITO or carbon nanotube electrode 4 is applied to the release film F in a manner in which an offset technique and a roller scribing technique are mixed, printing may be performed in an accurate pattern. In this case, the ITO or carbon nanotube electrode 4 may have various shapes, and the pattern groove 114 may be formed to suit this.

In addition, the ITO or carbon nanotube electrode 4 may be continuously formed on the release film F by using the ITO or carbon nanotube electrode forming apparatus 210 to which the roll printing method is applied as shown in FIG. 5. .

The ITO or carbon nanotube electrode forming apparatus 210 shown in FIG. 5 includes a forming roller 213 and a forming roller 213 in which forming grooves 214 of a pattern corresponding to the ITO or carbon nanotube electrodes 4 are formed. It is applied to the outer circumferential surface of the pair of pressure rollers 216 and the forming rollers 213 which are connected to both sides of the resin supply unit 211 and the forming roller 213 to supply the ITO or carbon nanotube electrode resin 4a from the upper side. The scriber 217 and the forming roller 213 which scrape the ITO or carbon nanotube electrode resin 4a so that the ITO or carbon nanotube electrode resin 4a remains only in the forming groove 214 of the forming roller 213. On one side of the ITO or carbon nanotube electrode resin 4a is configured to include a UV curing device 218 for irradiating ultraviolet (UV) for curing.

The ITO or carbon nanotube electrode 4 is formed on the release film F by using the ITO or carbon nanotube electrode forming apparatus 210 configured as described above.

As shown in FIG. 5, the ITO or carbon nanotube electrode forming apparatus in a state where the release film F is brought into close contact with the forming roller 213 while passing between the forming roller 213 and the pressure roller 216. ITO or carbon nanotube electrode resin 4a is supplied to the outer surface of the forming roller 213 which rotates in one direction from above the forming roller 213 of (210).

The ITO or carbon nanotube electrode resin 4a supplied to the outer surface of the forming roller 213 remains only in the forming groove 214 while being scratched by the scriber 217. The ITO or carbon nanotube electrode resin 4a accommodated inside the forming groove 214 of the forming roller 213 is transferred to the release film F at the point where the forming roller 213 and the release film F are peeled off and adhered thereto. Thus, the ITO or carbon nanotube electrode 4 is formed in the release film F in a predetermined pattern. Here, the ITO or carbon nanotube electrode 4 may have various shapes, and of course, the forming groove 214 may be formed to fit thereto.

When the ITO or carbon nanotube electrode 4 is formed on the release film F by selecting any of the methods described with reference to FIGS. 4 and 5, the ITO or carbon nanotube electrode of the release film F ( 4) is transferred to the substrate 1.

For example, as shown in FIG. 6, the substrate 1 is configured to move horizontally in one direction, and a plurality of pressure rollers 316 are formed on the substrate 1, and the release film F is formed. It is configured to be pressed by the pressure roller 316 while passing between the substrate 1 and the pressure roller 316, the release film (F) is pressed by the pressure roller 316, ITO or carbon of the release film (F) After the nanotube electrode 4 is transferred to the surface of the substrate 1 as it is, the release film F is separated and the ITO or carbon nanotube electrode 4 is laminated on the surface of the substrate 1.

Subsequently, the ITO or carbon nanotube electrode 4 and the substrate 1 are subjected to the firing process by irradiating ultraviolet rays or applying heat to the substrate 1 using the UV curing apparatus 318 and / or the heating apparatus 320. It is desirable to perform an operation to increase the interfacial adhesion between the faces.

Here, the ITO or carbon nanotube electrode is present in a mixed state with the UV curable resin or the thermosetting resin, and is heated by the heating apparatus 320 to be calcined, thereby reducing the thickness, thereby obtaining a desired thickness. . Of course, in consideration of the limit temperature such as melting point of ITO and carbon nanotubes, the firing process should be performed by setting the heating temperature differently for each material.

As described above, according to the present invention, the ITO or carbon nanotube electrode 4 is formed on the release film F in an accurate pattern, and then the ITO or carbon nanotube electrode 4 formed on the release film F is formed on the display device. The ITO or carbon nanotube electrode 4 is formed on the surface of the substrate 1 by transferring the adhesive onto the surface of the substrate 1 as it is. Accordingly, the process of forming the ITO or carbon nanotube electrode 4 on the surface of the substrate 1 is greatly simplified, and the ITO or carbon nanotube electrode 4 can be formed on the surface of the substrate 1 in an accurate pattern. A high quality display device can be realized. Here, the adhesive resin layer 2 may be further provided so that the ITO or carbon nanotube electrode 4 may be easily attached to the substrate 1.

According to the manufacturing method of the substrate 1 for a display apparatus provided with the carbon nanotube electrode 4 according to the present invention, the carbon nanotube electrode 4 is formed on the release film F and transferred to the substrate 1. The transparent electrode can be easily formed by bonding, thereby increasing production efficiency, reducing the use of process masks, and reducing costs, and accurately installing the thin film transistors.

While preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described specific embodiments. That is, those skilled in the art to which the present invention pertains can make many changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications are possible. Equivalents should be considered to be within the scope of the present invention.

1 is a view showing an electrode forming method using a conventional roller,

2 is a cross-sectional view illustrating a structure of an organic light emitting diode (OLED) substrate as an example of a substrate for a display device having an ITO or carbon nanotube electrode according to the present invention;

3 is a flowchart illustrating an embodiment of a method of manufacturing an organic light emitting diode substrate of FIG. 2.

4 is a configuration diagram schematically showing an embodiment of a method of forming an ITO or carbon nanotube electrode on a release film of the method for manufacturing a substrate for a display device having an ITO or carbon nanotube electrode according to the present invention;

5 is a configuration diagram schematically showing another embodiment of a method of forming an ITO or carbon nanotube electrode on a release film in a method of manufacturing a substrate for a display device having an ITO or carbon nanotube electrode according to the present invention; and

6 is a schematic view showing an embodiment of a method of transferring an ITO or carbon nanotube electrode formed on a release film to a substrate in a method of manufacturing a substrate for a display device having an ITO or carbon nanotube electrode according to the present invention; to be.

<Explanation of symbols for the main parts of the drawings>

1 substrate 2 resin layer

4: ITO or carbon nanotube electrode 4a: ITO or carbon nanotube electrode resin

110, 210: ITO or carbon nanotube electrode forming apparatus 111, 211: resin supply unit

112: resin supply roller 113: pattern forming roller

114: pattern groove 115: blanket roller

116, 216, 316: pressure roller 117, 217: scriber

118, 218, 318: UV curing apparatus 213: forming roller

214: forming groove 320: heating device

Claims (6)

Forming an electrode on one surface of the release film (S110); Attaching a surface on which the electrode of the release film is formed to a substrate (S120); Separating only the release film from the substrate while the electrode is transferred to the substrate (S130); UV curing the substrate (S140); And, And firing the substrate (S150); wherein the electrode is an ITO or carbon nanotube electrode. The method of claim 1, The step S110, supplying an electrode resin to the resin supply roller; Transferring the electrode resin to the pattern groove of the pattern forming roller which is rotated in contact with the resin supply roller while the resin supply roller rotates; Transferring the electrode resin accommodated in the pattern groove to the outer circumferential surface of the blanket roller which is rotated in contact with the pattern forming roller while the pattern forming roller rotates; And, And transferring the patterned electrode resin to one surface of the release film passing between the pressing rollers rotating in contact with the blanket roller while the blanket roller rotates to form an electrode. Manufacturing method. The method of claim 2, The manufacturing method further comprises the step of curing the electrode resin pattern by irradiating ultraviolet (UV) to the blanket roller after the step of delivering the electrode resin contained in the pattern groove to the outer peripheral surface of the blanket roller. The manufacturing method of the board | substrate for display apparatuses. The method of claim 1, In the step S110, the electrode resin is supplied to a forming roller in which a forming groove of a pattern corresponding to the electrode is formed, and passes through the release film between a pair of pressure rollers connected to both sides of the forming roller and an outer circumferential surface of the forming roller. In the process of moving while the release film is in close contact with the outer peripheral surface of the forming roller to perform the process to continuously transfer the electrode resin in the forming groove of the forming roller to the release film, the electrode continuously on the release film The manufacturing method of the board | substrate for display apparatuses characterized by the above-mentioned. The method of claim 2, One side of the pattern forming roller is a manufacturing method for a display device substrate, characterized in that further provided with a scriber scraping so that the electrode resin does not remain in the portion other than the pattern groove. The method of claim 1, The ITO or carbon nanotube electrode is a method of manufacturing a substrate for a display device, characterized in that the mixture is formed with a UV curable resin or a thermosetting resin.

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