KR101149042B1 - Method for fabricating optical film, method for fabricating optical filter and method for fabricating display apparatus - Google Patents

Abstract

Provided are a method of manufacturing an optical film, an optical filter, and a display device. The method of manufacturing an optical film includes attaching an adhesive film including an adhesive layer to the other surface of an optical substrate on which one optical substrate is not attached, and heat treating and pressing the optical substrate on which the adhesive film is attached.

Description

Method for fabricating optical film, method for fabricating optical filter and method for fabricating display apparatus

1 is a perspective view of an optical film produced by the method according to an embodiment of the present invention.

2 to 4 are cross-sectional views of process steps of a method of manufacturing an optical film according to an embodiment of the present invention.

5 is a cross-sectional view illustrating a modification of FIG. 4.

6 to 7 are cross-sectional views of the process step of the optical filter manufacturing method according to an embodiment of the present invention.

8 is a schematic exploded perspective view of a PDP device manufactured by a method according to an embodiment of the present invention.

9 is an exploded perspective view of a display panel assembly of an optical filter and a PDP device manufactured by a method according to an embodiment of the present invention.

FIG. 10 is a cross-sectional view taken along the line VII-VII 'of FIG. 9.

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

10: optical base material 20, 21: adhesive layer

31, 32: release film 50: optical film

60: optical filter 300: display panel assembly

600: PDP device

The present invention relates to a method of manufacturing an optical film, and more particularly, to an optical film having improved reworkability, an optical filter including the same, and a method of manufacturing a display device including the same.

As the modern society becomes more and more information, optical electronics-related parts and devices are progressing and spreading. Among them, display apparatuses for displaying images are widely used for television apparatuses, monitor apparatuses of personal computers, and the like.

A representative device of a conventional display device is a cathode-ray tube (CRT) device. However, as the CRT device does not sufficiently satisfy the market demand for larger and thinner display devices, liquid crystal displays (LCDs), organic electroluminescence (PLA), and plasma display panels. Flat display devices typified by PDP devices and the like have been actively studied as next generation display devices. Among them, PDP devices that have excellent viewing angles and are easy to be enlarged and thinned as a self-luminous device are in the spotlight, and in particular, the large-area television field is gradually replacing CRT devices.

However, the PDP device has a high emission amount of electromagnetic waves and near infrared rays due to its driving characteristics, high surface reflection of the phosphor, and color purity does not reach the cathode ray tube due to orange light emitted from the encapsulated gas helium (He) or xenon (Xe). Electromagnetic waves and near infrared rays emitted from the PDP device are not only harmful to the human body, but can also cause malfunction of precision device elements. Therefore, it is required to suppress the emission of electromagnetic waves and near infrared rays emitted from the PDP apparatus below a predetermined value. To this end, an optical filter having a function of shielding electromagnetic waves and near infrared rays while reducing reflected light and improving color purity is employed.

The optical filter has a structure in which two or more optical films are laminated, and each is attached by an adhesive layer. Such an optical filter is attached directly to the panel glass of the PDP apparatus or is disposed in front of the panel glass by supporting means. When lamination of the optical film or when the optical filter is attached to the panel glass, or when bubbles are generated, they must be removed and reattached. However, when the adhesive layer that contributed to the adhesion has a high adhesion to the skin deposit, residue may remain on the skin adhesion surface. Reattachment requires removal of the residue. If it is difficult to remove the residue, the skin deposit should be replaced. In addition, if the adhesion layer of the deposit is reduced, the adhesive force is reduced when reattachment, there is a need to replace the attachment itself. Therefore, if the residue remains as described above, the process becomes complicated and the manufacturing cost increases.

The technical problem to be achieved by the present invention is to provide a method for producing an optical film with improved reworkability.

Another object of the present invention is to provide a method for producing an optical filter comprising the optical film as described above.

Another object of the present invention is to provide a display device including the optical filter manufactured by the method as described above.

Another object of the present invention is to provide a method for producing an optical film composition as described above.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Method for manufacturing an optical film according to an embodiment of the present invention for solving the above technical problem is a step of attaching an adhesive film including an adhesive layer on the other surface of the optical substrate that is not attached to the other optical substrate on one surface and the adhesive film Heat-treating and pressing the attached optical substrate.

Method for manufacturing an optical filter according to an embodiment of the present invention for solving the other technical problem is the step of attaching an adhesive film including an adhesive layer on the other surface of the optical substrate that is not attached to the other optical substrate on one surface, and Heat-treating and pressurizing the optical substrate to which the adhesive film is attached to form an optical film, and forming an optical layer on one surface of the optical film.

According to another aspect of the present invention, there is provided a method of manufacturing a display device, the method including providing a display panel having panel glass, and using the optical filter manufactured by the method as described above. Attaching to the.

Specific details of other embodiments are included in the detailed description and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the present embodiments make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention belongs. It is provided to fully convey the scope of the invention to those skilled in the art, and the invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" May be used to readily describe a device or a relationship of components to other devices or components. Spatially relative terms are to be understood as including terms in different directions of the device in use or operation in addition to the directions shown in the figures. For example, when flipping a device shown in the figure, a device described as "below or beneath" of another device may be placed "above" of another device. Thus, the exemplary term "below" can include both downward and upward directions. The device may be oriented in other directions as well, in which case spatially relative terms may be interpreted according to orientation.

Hereinafter, a method of manufacturing an optical film according to an embodiment of the present invention will be described.

Method of manufacturing an optical film according to an embodiment of the present invention is a step of attaching an adhesive film including an adhesive layer on the other surface of the optical substrate that is not attached to the other optical substrate on one surface and heat treatment the optical substrate with the adhesive film And pressurizing. First, an optical film manufactured according to an embodiment of the present invention will be described. 1 is a perspective view of an optical film produced by the method according to an embodiment of the present invention.

Referring to FIG. 1, the optical film 50 includes an optical substrate 10 and an adhesive layer 21 formed on the optical substrate 10.

The optical substrate 10 serves to support various filter members. The optical substrate 10 may be formed of a material having a visible light transmittance of 80% or more and excellent heat resistance and strength. For example, it may be formed of an inorganic compound such as tempered, semi-tempered glass or quartz or a transparent resin. Examples of the transparent resin include polyethylene terephthalate, polysulfone, polyether sulfone, polystyrene, polyethylene naphthalate, polyarylate, polyether ether ketone, polycarbonate, polypropylene, polyimide, triacetyl cellulose, polymethyl methacrylate, and the like. This may be illustrated, but is not limited thereto. Of these, polyethylene terephthalate (PET) can be used in terms of price, heat resistance and transparency.

One surface of the optical substrate 10 is formed with a coating layer (not shown) including a filter member. The filter element may include, but is not limited to, a color correction material, a near infrared absorbing material, an antireflection material, an electromagnetic wave shielding material, and the like, and may include a mixture thereof. In addition, the filter member may be formed on the other surface of the optical substrate 10, may not be coated on the optical member 10, may be mixed with the optical substrate 10, or may be mixed with the adhesive layer 21 described later. have. On the other hand, the other optical substrate is not attached to the other surface of the optical substrate 10. The optical film referred to herein includes one optical substrate and, in the case of including two or more optical films, will be referred to as an 'optical filter'.

The adhesive layer 21 is formed on the other surface of the optical base material 10. The adhesive layer 21 contains a binder adhesive resin and a crosslinking agent.

The binder adhesive resin may be a copolymer including a large amount of functional groups of at least one of, for example, an isocyanate group, a carboxyl group, a hydroxyl group, or a glycidyl group as a resin expressing adhesiveness at room temperature. The functional groups react with the crosslinking agent, thereby contributing to the curing of the adhesive layer 21.

Examples of such binder adhesive resins include acrylic resins using at least one of ethyl acrylate, methyl acrylate or butyl acrylate as copolymerization monomers. Moreover, hydroxy group containing (meth) acrylate, such as carboxyl group-containing (meth) acrylate, such as acrylic acid, methacrylic acid, and maleic acid, (meth) acrylic acid hydroxymethyl, and (meth) acrylic acid 2-hydroxyethyl, and methyl meta Alkyl (meth) acrylic acid esters and styrene having alkyl groups having 1 to 12 carbon atoms such as acrylate, ethyl methacrylate, butyl methacrylate, n- or i-propyl (meth) acrylate, and cyclohexyl (meth) acrylate A copolymer using at least one of vinyl monomers such as acrylonitrile and the like as the copolymerization monomer may be used, but is not limited thereto. Preferably, an acrylic resin having excellent mechanical strength and good transparency in the visible region may be used.

The crosslinking agent reacts with the functional group of the binder adhesive resin as described above. Examples of the crosslinking agent include, but are not limited to, epoxy compounds or polyisocyanate compounds.

Examples of the epoxy compound include sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, glycerol polyglycidyl ether, and resorcinol diglycid. Dyl ether, neopentylglycol diglycidyl ether, 1, 6-hexanediol diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, etc. Is illustrated, but is not limited thereto.

Examples of the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate. Alicyclic polyisocyanate, such as these, etc. are mentioned, It is not limited to this.

The binder adhesive resin as described above may be cross-linked with the crosslinking agent. Therefore, the adhesive layer 21 according to the exemplary embodiment of the present invention may further include a binder adhesive resin-crosslinker combination in addition to the binder adhesive resin and the crosslinking agent.

Another example of the adhesive layer 21 according to the embodiment of the present invention is that all the binder adhesive resin and the crosslinking agent react with each other, so that the unreacted binder adhesive resin and the unreacted crosslinking agent are not included, and the binder adhesive resin and the crosslinking agent are combined with each other. It may be included in the form. In this way, when the content of the binder increases, the adhesion of the adhesive layer may increase.

The release film 31 is affixed to the other surface of the surface of the adhesion layer 21 adhering to the optical base material 10. The release film 31 uses a film having a relatively weak adhesive force with the adhesive layer 21. The surface of the release film 31 may be provided with a coating surface to reduce the adhesive force. Such a release film 31 may be easily separated while protecting the adhesive layer 21 of the optical substrate 10. Accordingly, easy adhesion to other optical films or glass surfaces that follow can be maintained while maintaining the adhesion of the adhesive layer 21. In addition, the release film can be removed in the course of the use of the optical film, since it does not change the intrinsic properties of the optical film, so in the present specification, if there is no fear of confusion, sometimes even when the release film is removed, the 'optical' Film, and the same reference numerals as those of the optical film to which the release film is attached will be described.

Next, a method of manufacturing the adhesive layer as described above will be described with reference to FIGS. 1 and 2 to 5. 2 to 4 are cross-sectional views of process steps of a method of manufacturing an optical film according to an embodiment of the present invention.

Referring to FIG. 2, an adhesive film 30 having release films 31 and 32 attached to one surface and the other surface of the adhesive layer 20 is prepared. In this case, the adhesive film 30 may be one provided with a coated surface to facilitate separation from the adhesive layer 20 on the surfaces of the release films 31 and 32 attached to the adhesive layer 20. Subsequently, one release film, for example, the release film 32 attached to the other surface of the adhesive layer 20 is removed.

Next, referring to FIG. 3, the release film 32 is removed to attach the exposed adhesive layer 20 to the optical substrate 10. As described with reference to FIG. 1, the optical substrate 10 may include various filter members. Here, the removing of the release film 32 and the attaching to the optical substrate 10 may be performed by a roll-to-roll laminator.

Next, referring to FIG. 4, the optical substrate 10 with the adhesive film is placed in an autoclave or the like, and heat treated and pressed. At this time, the heat treatment temperature may be 30 ° C or more to sufficiently increase the fluidity of the pressure-sensitive adhesive layer, it may be 90 ° C or less to prevent deterioration, such as color change of the filter member provided in the optical substrate. The pressure may have a range of 1 to 20 bar to sufficiently prevent adhesion of the adhesive layer while sufficiently increasing the adhesion of the adhesive layer 21 having increased fluidity. The heat treatment and pressurization time may be, for example, 10 to 120 minutes. Through the heat treatment and the pressing step as described above, an adhesive layer 21 having an increased adhesion to the optical substrate 10 is formed. On the other hand, since the adhesive force between the adhesive layer 21 and the release film 31 is subjected to an adhesive force reducing treatment or the like on the surface of the release film 31, the release film 31 required when the optical film is adhered to another member is used. It does not increase significantly enough to affect the removal step.

5 is a cross-sectional view illustrating a modification of FIG. 4. As described above, the heat treatment and pressing may be performed in a state in which an optical substrate having an adhesive film is wound in a roll shape as shown in FIG. 5. In this case, the pressure transmission to the adhesive layer 21 can be made more efficiently.

Referring back to FIG. 1, the optical film 50 including the pressure-sensitive adhesive layer 21 having increased adhesion to the optical substrate 10 is completed by undergoing the treatment step as described above.

Hereinafter, the manufacturing method of the optical filter containing the optical film manufactured by the method as mentioned above is demonstrated. In the present embodiment, description overlapping with the optical film and the method of manufacturing the same according to the embodiment of the present invention described above will be omitted or simplified. 6 to 7 are cross-sectional views of the process step of the optical filter manufacturing method according to an embodiment of the present invention.

Referring to FIG. 6, first, an optical film 50 manufactured by the method according to an embodiment of the present invention is prepared. Next, the release film 31 attached to one side of the optical film 50 is separated to expose the adhesive layer 21.

Next, referring to FIG. 7, another optical film 50 ′ prepared by the method according to the exemplary embodiment of the present invention is prepared. Here, the optical film 50 'includes an optical base 10', an adhesive layer 21 ', and a release film 31'. The exposed adhesive layer 21 of the optical film 50 is attached to the other surface of the optical substrate 10 '. Thereby, the optical filter 80 which consists of two optical films 50 and 50 'is completed. If necessary, the entire optical filter 80 may be heat treated and pressurized to increase the adhesion of the adhesive layer 21 and to remove bubbles generated between the adhesive layer 21 and the optical substrate 10 '. For example, the optical filter 80 may be placed in an autoclave, and may be heat treated and pressurized for 10 to 120 minutes under conditions of 30 to 90 ° C and 1 to 20 bar.

On the other hand, in the attaching step of the optical film 50 and the optical film 50 ′ in which the release film (31 in FIG. 6) has been removed, if excessive bubbles occur or the alignment is uneven, the optical film 50 is peeled off and re-installed. The rework process of adhering is performed. Here, when the optical film 50 is peeled off, if some or all of the adhesive layer 21 remains as residue on the other surface of the optical film 50 ', it should be removed, and the adhesive layer 21 is removed from the optical film 50. If this relatively large drop, the re-adhesive force may be weakened and should be replaced with another optical film. However, in the optical film 50, since the adhesive force between the optical substrate 10 and the adhesive layer 21 is increased during the heat treatment and the pressing step as described above, separation or residue of the adhesive layer 21 during peeling It does not occur. Thus, the rework process can be improved.

Similarly, in the case where the optical filter is attached to the panel glass of the display device or the like in a subsequent step, the adhesive force between the optical substrate 10 'and the adhesive layer 21' of the optical film 50 'is increased by the heat treatment and pressing process. As such, the rework process involving separation and reattachment from the panel glass can be improved.

Although the optical filter 60 which consists of two optical films 50 and 50 'was illustrated as an optical filter in the above, the same method can be applied also when manufacturing the optical filter which consists of three or more optical films. In addition, a support substrate (not shown) made of glass or the like may be further included between the optical films. In this case, the order in which the optical substrate and the adhesive layer of the optical film are disposed around the support substrate may be symmetrical, or may be the same. In the above case, if symmetrical, one side or the other side of the support substrate may be provided with an adhesive layer not included in the optical film.

In addition, this embodiment is not limited to the case where all the optical film constituting the optical filter is produced by the method according to an embodiment of the present invention, at least one optical film is produced by the method according to an embodiment of the present invention Includes cases. In this case, it will be readily understood that the rework process between the optical film manufactured by applying the method according to an embodiment of the present invention and the neighboring optical film or between the optical film and the panel glass of the display device can be improved. .

The optical filter manufactured by the method as described above may be applied to the display device. Hereinafter, a display device and a method of manufacturing the optical filter manufactured by the method according to the embodiments of the present invention will be described. In the present embodiment, descriptions that overlap with the optical filter and the manufacturing method thereof according to the embodiment of the present invention described above will be omitted or simplified. Although a PDP device is illustrated here as a display device for convenience, the present invention is not limited thereto and may be applied to a case of a field emission display (FED), a surface conduction electron emitter display (SED) device, and the like.

First, a PDP device manufactured by the method according to an embodiment of the present invention will be described. 8 is a schematic exploded perspective view of a PDP device manufactured by a method according to an embodiment of the present invention.

Referring to FIG. 8, the PDP device 600 manufactured by the method according to an exemplary embodiment of the present invention blocks the case 100, a cover 500 covering the upper portion of the case, electromagnetic waves, near infrared rays, and the like, and corrects color. A display panel assembly 300 including an optical filter 60, a display panel assembly including a discharge cell in which gas discharge occurs, and a driving circuit board 400 accommodated in the case 100 to control light emission from the discharge cell. ).

FIG. 9 is an exploded perspective view of a display panel assembly of an optical filter and a PDP device manufactured by a method according to an exemplary embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along the line '-' of FIG.

9 and 10, the display panel assembly 300 may include a first insulating substrate 311 made of glass, a second insulating substrate 321 facing the first insulating substrate 311, and a first insulating substrate. The phosphor layer 325 and the discharge cell 326 positioned between the 311 and the second insulating substrate 321 are included. In this specification, the first and second insulating substrates 311 may sometimes be referred to as 'panel glass'.

Under the first insulating substrate 311, a plurality of sustain electrodes 312 are arranged in a stripe shape. Each sustain electrode 312 is formed with a bus electrode 713 for reducing signal delay. A dielectric layer 314 is formed below the first insulating substrate 311 on which the storage electrode 312 is formed, and a dielectric protective film 715 is formed below the dielectric layer 314. The dielectric protective film 715 may be formed by covering the MgO thin film on the surface of the dielectric layer 314 using, for example, sputtering or the like.

On the other hand, a plurality of address electrodes 322 are arranged in a stripe shape on an upper surface of the second insulating substrate 321 facing the first insulating substrate 311. In this case, the address electrode 322 may be disposed to cross the sustain electrode 312 of the first insulating substrate 311 in a state where the first insulating substrate 311 and the second insulating substrate 321 are disposed to face each other. A dielectric layer 323 covering the address electrode 322 is formed thereon, and a plurality of partition walls 324 protruding toward the first insulating substrate 311 are disposed on the dielectric layer 323 in parallel with the address electrode 322. have. The partition wall 324 may be disposed in an area between the neighboring address electrodes 322.

The phosphor layer 325 is formed on the side surface of the groove portion defined by the neighboring partition wall 324 and the dielectric layer 323. The phosphor layer 325 may be formed such that the red phosphor layer 325R, the green phosphor layer 325G, and the blue phosphor layer 325B are alternately arranged at each groove portion partitioned by the partition wall 324. The phosphor layer 325 is composed of a phosphor particle group formed by a screen printing method, an inkjet method, a photoresist film method, or the like. Examples of a material constituting the phosphor layer 325 include (Y, Gd) BO ₃ : Eu as a red phosphor, Zn ₂ SiO ₄ : Mn as a green phosphor, and BaMgAl ₁₀ O ₁₇ : Eu as a blue phosphor. It is not limited.

Discharge gas is enclosed in the discharge cell 326 which consists of the 1st insulating board 311, the 2nd insulating board 321, and a dielectric protective film. That is, the discharge cell 326 is a portion of the display panel assembly 300 where the storage electrode 312 and the address electrode 322 cross between the first insulating substrate 311 and the second insulating substrate 321. Is formed. As the discharge gas, for example, a Ne-Xe-based gas, a He-Xe-based gas, or the like may be used.

The display panel assembly 300 having the above structure basically has the same emission principle as the fluorescent lamp. That is, the ultraviolet rays emitted from the discharge gas in accordance with the discharge in the discharge cell 326 excite the phosphor layer 325 and emit light, thereby being converted into visible light. Here, phosphor materials having respective conversion efficiencies to different visible light are used for the phosphor layers 325R, 325G, and 325B of each color used in the display panel assembly 300. Therefore, when displaying an image on the display panel assembly 300, the color balance is adjusted by adjusting the luminance of each phosphor layer 325R, 325G, and 325B. For example, the color balance can be adjusted by lowering the luminance of another phosphor layer at a specified ratio for each color based on the phosphor layer of the color having the lowest luminance.

The display panel assembly 300 is divided into driving for address discharge and driving for sustain discharge. The address discharge occurs between the address electrode 322 and one sustain electrode 312, at which time wall charge is formed. The sustain discharge is caused by the potential difference between the two sustain electrodes 312 positioned in the discharge cell 326 in which the wall charge is formed. The ultraviolet light generated from the discharge gas during the sustain discharge excites the phosphor layer 325 of the corresponding discharge cell 326 to emit visible light, and the visible light is emitted through the first insulating substrate 311 to be recognized by the user. To form an image.

The optical filter 60 is substantially the same as the optical filter manufactured by the method according to the embodiments of the present invention described above. However, of course, the release film may be removed according to the attachment method. The optical filter 60 may be directly attached to the first insulating substrate 311 of the display panel assembly 300 or fixedly disposed in front of the display panel assembly 300 by a separate support member (not shown).

The manufacturing method of the above PDP apparatus is demonstrated.

First, the display panel assembly 300 is prepared. The display panel assembly 300 may be manufactured by a conventional method known in the art, and detailed description thereof is omitted for clarity.

In addition, the optical filter 60 is prepared. The optical filter 60 is manufactured separately from the display panel assembly 300 and is manufactured by a method according to embodiments of the present invention.

Subsequently, the optical filter 60 is attached to the panel glass of the display panel assembly 300, that is, the first insulating substrate 311. Here, when the attachment of the optical filter 60 and the first insulating substrate is not properly performed, a rework process including separation and reattachment may be performed. In this case, as described above, the rework process may be improved such that no residue is left on the first insulating substrate 311.

More detailed information about the present invention will be described through the following specific experimental examples, and details not described herein will be omitted since they can be inferred technically by those skilled in the art.

Experimental Example 1

First, an acrylic adhesive solution having a molecular weight of 300,000 and a glass transition temperature of -68 ° C was prepared. The adhesive solution was coated using a roll coater on a release film having a thickness of 38 μm and an adhesive force of 40 g / 25 mm. At this time, the thickness of the adhesive layer which is the coating film was to be 25㎛.

Subsequently, a release film having a thickness of 38 μm and an adhesive force of 10 g / 25 mm was attached on the adhesive layer, thereby forming a double-sided adhesive film having a release film attached to both sides of the adhesive layer.

Subsequently, one side of the exposed adhesive layer was attached to the color correction film while separating the release film attached to one side of the double-sided adhesive layer using a roll-to-roll laminator. Subsequently, the color correction film with the adhesive layer was wound up to form a color correction film roll.

Subsequently, the color correction film roll was placed in an autoclave, heat treated and pressurized at 40 ° C. and 5 bar for 30 minutes. Subsequently, the color correction film rolls were cut in sheet units, and then laminated on one surface of a support substrate made of glass. Subsequently, the antireflection film and the electromagnetic wave blocking film were laminated on the other surface of the support substrate in turn, and then heat treated and pressurized at 50 ° C. and 4 bar for 30 minutes to remove bubbles and improve adhesion.

Experimental Example 2

An optical filter was manufactured in the same manner as in Experiment 1, except that the color correction film roll was placed in an autoclave and heat-treated and pressurized at 60 ° C. and 6 bar for 30 minutes.

<Experimental Example 3>

Instead of placing the color correction film roll in an autoclave for 30 minutes at 40 ° C. and 5 bar, it was carried out in the same manner as in Experiment 1 until heat treatment and pressing for 30 minutes at 40 ° C. and 5 bar was performed. . Subsequently, the color correction film roll was cut into sheets, and then the antireflection film and the electromagnetic wave blocking film were laminated on the opposite side of the surface on which the adhesive layer was attached. Then, the optical filter was prepared by heat treatment and pressure for 30 minutes under conditions of 50 ° C. and 4 bar to remove bubbles and improve adhesion.

Comparative Example 1

An optical filter was manufactured in the same manner as in Experiment 1, except that the color correction film roll was not heat-treated or pressed.

Comparative Example 2

Instead of heat-treating and pressurizing the color correction film roll, an optical filter was prepared in the same manner as in Experiment 1 except that the color correction film roll was placed in an autoclave and heat-treated at a temperature of 40 ° C. without being pressurized.

Comparative Example 3

Instead of heat-treated and pressurized for 30 minutes under conditions of 40 ° C. and 5 bar, the color correction film roll was placed in an autoclave, and was heat-treated and pressurized for 30 minutes under conditions of 100 ° C. and 5 bar. An optical filter was prepared.

Comparative Example 4

An optical filter was manufactured in the same manner as in Experiment 3, except that the color correction film roll was not heat-treated or pressed.

After peeling the color correction film from the support substrate with respect to the optical filters manufactured by Experimental Examples 1, 2 and Comparative Experiments 1 to 3, it was visually observed whether an adhesive residue remained on the surface of the support substrate. In addition, the color change of the optical filter was also observed.

In addition, the release film attached to one surface of the color correction film with respect to the optical filter prepared in Experimental Example 3 and Comparative Experimental Example 4 was removed, and was attached to an alkali-free glass plate. Subsequently, after standing for one week at room temperature, the optical filter was removed from the glass plate and the presence or absence of the residue was visually observed. In addition, the color change of the optical filter was also observed.

The results are shown in Table 1 below. In Table 1, when the adhesive residue remained, 'X' was indicated, 'O' when no residue remained, and '△' when some residue remained.

TABLE 1

Residue Color change Experimental Example 1 ○ none Experimental Example 2 ○ none Experimental Example 3 ○ none Comparative Experimental Example 1 × none Comparative Experiment 2 × none Comparative Experiment 3 △ Yellowing phenomenon Comparative Experiment 4 × none

As can be seen from Table 1, in Comparative Experiment 1, Comparative Experiment 2 and Comparative Experiment 4, the adhesive residue remained in the peel test because the color correction film roll was not heat treated and / or pressurized. In Comparative Experiment 3, the heat treatment was performed, but the color of the color correction film roll was changed to yellow by heat treatment at a high temperature. In Comparative Experimental Example 3, some of the adhesive residue remained in the peel test, which is considered to be because the hardness of the adhesive was weakened by the high heat treatment temperature, thereby deteriorating the effect of strengthening the adhesive force due to pressure.

On the other hand, in Experimental Examples 1 to 3, no residue remained in the peeling test, and no change in color was caused. Therefore, it can be seen that the optical filters according to Experimental Examples 1 to 3 have good reworkability.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments but may be manufactured in various forms, and having ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

As described above, according to the manufacturing method of the optical film according to the embodiment of the present invention, the adhesive force between the optical substrate and the adhesive layer is increased, thereby improving reworkability including peeling and reattaching. In addition, even in an optical filter including the optical film as described above and a display device including the same, the leakage property between the optical films or between the optical filter and the display device may be improved. Therefore, the process efficiency is high, and the manufacturing cost can be reduced.

Claims (13)

Attaching an adhesive film including an adhesive layer to the other surface of the optical substrate on which one other optical substrate is not attached; And After winding the optical substrate with the adhesive film in the shape of a roll, a method of manufacturing an optical film comprising a heat treatment and pressing. The method according to claim 1, The adhesive film may include a release film attached to one surface of the adhesive layer, and the attaching the adhesive film to the optical substrate may include attaching the other surface of the adhesive layer to the other surface of the optical substrate. Manufacturing method. delete 3. The method of claim 2, One surface of the optical substrate is a manufacturing method of an optical film provided with a coating layer. The method according to claim 1, The heat treatment and pressurizing step is a heat treatment at 30 to 90 ℃ for 10 to 120 minutes, the step of pressing to 1 to 20 bar optical film manufacturing method. Attaching an adhesive film including an adhesive layer to the other surface of the optical substrate on which one other optical substrate is not attached; Manufacturing an optical film by winding the optical substrate having the adhesive film attached thereto in a roll shape, and then heat treating and pressing the optical substrate; And Forming an optical layer on one surface of the optical film. The method according to claim 6, The adhesive film may include a release film attached to one surface of the adhesive layer, and the attaching the adhesive film to the optical substrate may include attaching the other surface of the adhesive layer to the other surface of the optical substrate. Manufacturing method. delete The method according to claim 6, The heat treatment and pressurizing step is a heat treatment at 30 to 90 ℃ for 10 to 120 minutes, the step of pressing to 1 to 20 bar optical filter manufacturing method. The method according to claim 6, The optical layer is a method of manufacturing an optical filter comprising at least one of an optical film and a support substrate. The method according to claim 6, And heat treating and pressing the optical film on which the optical layer is formed after the forming of the optical layer. 12. The method of claim 11, Heat-treating and pressurizing the optical film on which the optical layer is formed are heat-treated at 30 to 90 ° C. for 10 to 120 minutes and pressurized to 1 to 20 bar. Providing a display panel assembly having a panel glass; And A method of manufacturing a display device, comprising attaching an optical filter manufactured by the method according to any one of claims 6, 7, and 9 to 12 to the panel glass.

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