TWI634001B - Optical film, display panel module and method for producing the same - Google Patents

Abstract

The present invention provides an optical film including a polarizing plate and an adhesive layer, wherein the polarizing plate includes a polarizing film and a first protective film and a second protective film respectively located on two sides. The content of the metal ions in the first protective film is 1 ~ 5ppm; an adhesive layer is formed on a surface of the first protective film and is formed of an adhesive containing a bridging agent; the present invention also provides a related display panel module and a manufacturing method thereof.

Description

Optical film, display panel module and manufacturing method thereof

The invention relates to an optical film, a display panel module and a related manufacturing method; in particular, it relates to an optical film, a display panel module and a related manufacturing method of an alkalized polarizing plate.

The composition of the polarizer and the manufacturing process change with each passing day. The difference will affect the performance of the pressure-sensitive adhesive layer applied later. Therefore, the same adhesive used in different polarizers will show different adhesion, such as a bridging agent and an alkali. After the polarizing plate is matched and then attached to the liquid crystal display panel, problems such as excessive adhesion of the pressure-sensitive adhesive layer over time and poor reworkability may occur.

In order to solve the above problems, the present invention proposes an optical film and a display panel module, which are applied to an alkaline polarizing plate, which can improve the reworkability. In addition, a related method for manufacturing an optical film and a display panel module is also proposed.

The present invention provides an optical film including a polarizing plate and an adhesive layer, wherein the polarizing plate includes a polarizing film and a first protective film and a first protective film respectively located on two sides. The two protective films have a metal ion content of 1 to 5 ppm in the first protective film; an adhesive layer is formed on one surface of the first protective film and is formed of an adhesive containing a bridging agent.

The present invention further provides a display panel module including a display panel substrate and the aforementioned optical film, wherein an adhesive layer of the optical film is bonded to the display panel substrate.

The present invention further provides a method for manufacturing an optical film, including the following steps: providing a protective film, wherein the protective film has a first surface and a second surface opposite to the first surface; an alkalized protective film; a corona discharge treated protective film The first surface, wherein the unit energy of the corona is 60 J / m ² or more; and an adhesive layer is adhered on the first surface of the protective film, wherein the adhesive layer is formed by an adhesive.

The present invention further provides a display panel module manufacturing method, which includes the following steps: providing a display panel substrate; and bonding the optical film manufactured by the aforementioned optical film manufacturing method to a display panel substrate, wherein the optical film is adhered The layer is bonded to the display panel substrate.

In summary, by further processing the surface of the protective film that will be in contact with the adhesive layer containing the bridging agent, the present invention can adjust the adhesion of the adhesive layer to the substrate in a simpler manner without changing the formula of the adhesive layer. This reduces the manufacturing cost of the display panel module polarizing plate by reducing the process loss.

Some typical embodiments embodying the features and advantages of this case will be described in detail in the description in the subsequent paragraphs. It should be understood that the present case can have various changes in different aspects, all of which do not depart from the scope of the present case, and that the descriptions and drawings therein are essentially for the purpose of illustration, rather than limiting the case.

FIG. 1 is a schematic diagram of an optical film structure according to an embodiment of the present invention. The optical film 1 of the present invention includes a polarizing plate 10 and an adhesive layer 30 coated on the surface of the polarizing plate 10, and the other side of the adhesive layer 30 is covered with The release film 20 and the polarizing plate 10 include a polarizing film 11 and a protective film 12 attached to both sides.

In one embodiment, one or both of the protective films 12 can be a single or multiple layers. In one embodiment, one or both of the protective films 12 may be a functional protective film, such as a compensation film. In one embodiment, the optical film 1 may further include other single or multiple protective or functional optical film layers, such as gain, alignment, compensation, steering, orthogonal, diffusion, protection, anti-stick, Layers that are useful for scratch resistance, anti-glare, reflection suppression, high refractive index, etc., can be, for example, alignment liquid crystal layers with properties such as controlled viewing angle compensation or birefraction, easy-to-bond treatment layers, hard coatings, anti- Various surface treatment layers such as reflection layer, anti-adhesion layer, diffusion layer, anti-glare layer.

The material of the release film 20 may be polyethylene terephthalate (PET), polybutylene terephthalate, polycarbonate, polyarylate, polyester resin, olefin resin, acetate fiber Plain resin, acrylic resin, polyethylene (PE), polypropylene (PP), cycloolefin resin, or a combination thereof.

The adhesive layer 30 is formed of an adhesive. In one embodiment, it can be a pressure sensitive adhesive (PSA). The composition of the adhesive mainly includes but is not limited to: (A) the main agent and (B) the bridge Agent and (C) silane coupling agent, each composition will be described below.

(A) Main agent : The main agent contains at least one (meth) acrylate. In the following, (meth) acrylate means any one of acrylate or methacrylate, and the remaining "(meth)" The meaning can also be deduced by analogy. The (meth) acrylate may be selected from, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, or n- (meth) acrylate Linear alkyl (meth) acrylates such as octyl ester, undecyl (meth) acrylate; or, for example, selected from: isobutyl (meth) acrylate, 2-ethyl (meth) acrylate Hexyl ester, isooctyl (meth) acrylate, etc., branched alkyl (meth) acrylate; or, for example, can be selected from: 2-methoxyethyl (meth) acrylate, ethyl (meth) acrylate (Meth) acrylic acid-substituted alkyl (meth) acrylates such as oxymethyl esters. In addition, the (meth) acrylate may contain an aryl group, such as benzyl (meth) acrylate, etc .; or the (meth) acrylate may contain an aryloxy group, such as 2-phenoxyethyl (meth) acrylate, 2- (2-phenoxyethoxy) ethyl (meth) acrylate, (meth) acrylate of nonylphenol modified by ethylene oxide, 2- (o-phenyl) (meth) acrylate Phenoxy) ethyl ester and the like. After curing and drying, the cross-linked (meth) acrylate is the main component and structure of the adhesive layer.

In one embodiment, the main agent may include the following formulation ratios: 40 to 90 parts by weight of butyl acrylate (BA), 10 to 40 parts by weight of methyl acrylate (MA), 1 part by weight or less of acrylic acid (AA), and acrylic acid 2- 5 parts by weight or less of hydroxyethyl ester (HEA), 5 parts by weight or less of 2-methoxyethyl acrylate (MEA), and 4-10 parts by weight of 2-phenoxyethyl acrylate (PEA). In one embodiment, the average molecular weight of the main agent is between 1.2 and 1.7 million, and Mw / Mn is between 3.5 and 5.

(B) Bridging agent: The bridging agent can help the (meth) acrylate monomer in the main agent to crosslink, form a network structure, and improve the strength of the adhesive layer. The bridging agent has at least two functional groups in the molecule. Reacts with the polar functional group of the (meth) acrylate monomer in the main agent. Its types are epoxy-based bridging agent, isocyanate-based bridging agent, imine-based bridging agent, metal chelate-based bridging agent, and aziridine. As a bridging agent, one kind can be selected or mixed with a plurality of bridging agents. The total amount of the bridging agent is 0.05 to 10 parts by weight or 0.05 to 10 wt% of the adhesive. If the proportion of the bridging agent is too low, it can increase part of the adhesive force. However, the cohesiveness of the formed adhesive layer is insufficient, and foaming may occur during high temperature testing.

The epoxy bridging agent can be selected from, for example, bisphenol A epoxy resin, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol triglycidyl Ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, N, N-diglycidylaniline, N, N, N ', N'-tetraglycidyl-m -Xylene diamine, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, and the like.

Isocyanate bridging agent has at least two isocyanate groups (NCO) in the molecule, for example, can be selected from: toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, hydrogenated xylene diisocyanate Isocyanates, diphenylmethane diisocyanates, hydrogenated diphenylmethane diisocyanates, naphthalene diisocyanates, triphenylmethane triisocyanates, and the like. In addition, a bridging agent can also be used by using an adduct obtained by reacting these isocyanate compounds with a polyhydric alcohol such as glycerin or trimethylolpropane, or by forming an isocyanate compound into a dimer or trimer.

The imine bridging agent can be selected from, for example, diethylenetriamine and triethylenetetramine.

The metal chelating bridging agent can be selected from, for example, the multivalent value of ethylacetone or ethylacetate with aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, barium, chromium, zirconium, etc. Compounds formed by coordination of metals.

The aziridine bridging agent can be selected from, for example, diphenylmethane-4,4'-bis (1-aziridinecarboxamide), toluene-2,4-bis (1-aziridinecarboxamide) , Triethylene melamine, m-xylylenedi-bis-1- (2-methylaziridine), p--1-aziridinylphosphine oxide, hexamethylene-1,6-bis (1 -Aziridinecarboxamide), trimethylolpropane-tri-β-aziridinylpropionate, tetramethylolmethane-tri-β-aziridinylpropionate, and the like.

(C) Silane coupling agent: The polarizing plate 10 is adhered to one side of the adhesive layer 30 and will be in close contact with the substrate of the display panel. In order to improve the adhesion between the adhesive layer and the substrate (especially the glass substrate), a silane coupling agent will be added. One or the following silane coupling agents may be selected, and the total amount of the silane coupling agents is 0.01 to 10 parts by weight. Silane coupling agents can be selected from, for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyl ginseng (2-methoxyethoxy) silane, 3-methacryloxypropyltrimethoxy Silane compounds containing polymerizable unsaturated groups (such as ethylenic bonds); or, for example, selected from: 3-glycidoxypropyltrimethoxysilane, 2- (3,4-epoxy ring Hexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyl Silane compounds having an epoxy group structure, such as ethoxydimethylsilane; or, for example, selected from: 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N- (2-Aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, etc. Silane compounds; or, for example, halogenated substituent-containing silane compounds such as 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, etc .; other examples: 3-methylpropene Methoxypropyltrimethoxy Silane, 3-mercaptopropyl trimethoxy Silane like.

The composition of the adhesive can also be added with other appropriate additives, such as antistatic agents, according to the actual product requirements.

The adhesive layer 30 is agitated and mixed with the above-mentioned adhesive, and is applied to the release-treated surface of the release film 20 after standing and defoaming. The coating method includes, for example, a bar coating method, a blade coating method, and a roll coating method. , Plate coating method, die coating method, gravure coating method, etc., and finally a drying step is performed, and the dried adhesive forms an adhesive layer 30, which can be adhered to the protective film by applying pressure.

The polarizing film 11 may be a known metal polarizing film, an iodine-based polarizing film, a dye-based polarizing film, a polyethylene polarizing film, or the like. In one embodiment, the material of the polarizing film 11 is, for example, a polyvinyl alcohol (PVA) film containing a dichroic pigment capable of being adsorbed and aligned, or a liquid crystal material formed by absorbing dye molecules.

The material of the protective film 12 includes, for example, triacetate cellulose (TAC), polymethylmethacrylate (PMMA), polyethylene terephthalate (PET), and polypropylene (polypropylene). , PP), cyclo olefin polymer (COP), polycarbonate (PC), or any combination thereof. In addition, the protective layer may be further subjected to a surface treatment, for example, an anti-glare treatment, an anti-reflection treatment, a hard coating treatment, a charging prevention treatment, or an antifouling treatment.

The protective film 12 has a first surface 121 and a second surface 122 opposite to each other, wherein the first surface 121 is in contact with the adhesive layer 30, and an adhesive layer 13 may be included between the second surface 122 and the polarizing film 11, and the adhesive layer 13 is formed by A transparent adhesive layer made of an aqueous adhesive, wherein the material of the adhesive includes polyvinyl alcohol powder.

In order to improve the adhesion between the protective film 12 and the adhesive layer 13, before the protective film 12 and the polarizing film 11 are bonded, the protective film 12 is first treated with an alkali solution. The alkali solution contains metal ions and hydroxide and metal ions. It is a positive monovalent metal ion (such as a metal ion of the alkali gold group) or a positive divalent metal ion (such as a metal ion of the alkaline earth group). In some embodiments, the metal ion is potassium ion or sodium ion, and the alkaline solution is hydrogen. An aqueous potassium oxide solution or an aqueous sodium hydroxide solution is not limited thereto.

In some embodiments, the concentration of the lye is 1-8N, the preferred concentration is 1N-6N, and the optimal concentration is 3N-5N. The alkalizing treatment can be performed at a temperature above 40 ° C. Actually, it is adjusted according to the conditions of different film materials. In some embodiments, the preferred treatment temperature is between 50 ° C and 60 ° C. In some embodiments, the alkalizing treatment may be performed for 5 to 40 seconds, and the more preferable alkalizing treatment time may be performed for 10 to 30 seconds. Then, the surface of the protective film 12 is washed with pure water to remove most of the lye. In some embodiments, the cleaning time is about 5 seconds, and finally dried in an oven. After the alkalizing process, the surface roughness of the protective film 12 increases, which can improve the adhesion of the adhesive layer 13 to the protective film 12, and the surface carboxylic acid group of the specific protective film 12 is converted into a hydroxyl group, which is beneficial to the use of an aqueous adhesive for the protective film. 12 is bonded to the polarizing film 11.

However, the first protective film after basified surface even after washing of the 12,112 still remaining basic substance, such as potassium hydroxide or sodium hydroxide, the residual hydroxide (OH ^-) will be in a subsequent process and the adhesive layer 30 The bridging agent reaction in the example, taking isocyanate bridging agent as an example, produces the following reaction: The bridging agent originally reacted with (1) the hydroxyl (-OH) of the copolymer in the main agent and (2) the silane compound to hydrolyze to form the hydroxyl groups in the silanols. However, after the bridging agent was consumed by the hydroxide, not only it was reduced. The degree of cross-linking of the adhesive layer 30 affects cohesion, and some of the hydroxyl groups in the main agent and the silane coupling agent do not participate in the reaction of the bridging agent, so that excessive hydroxyl groups remain in the adhesive layer 30. When the adhesive layer 30 is bonded to the substrate of the panel (especially (Glass substrate), these excess hydroxyl groups continue to form hydrogen bonds with the hydroxyl groups on the substrate surface or form covalent bonds after heating and dehydration, resulting in an increase in adhesion over time, making the adhesive layer 30 no longer reworkable.

After the protective film 12 and the polarizing film 11 are bonded, the present invention further uses Corona to corona the surface of the polarizing plate that is subsequently bonded to the adhesive layer 30, that is, the first surface 121 of the protective film, at least once. Discharge treatment to reduce the content of alkaline substances remaining on the first surface 121 of the protective film 12 after alkalization. This can avoid the residual hydroxide on the protective film 12 from reacting with the bridging agent first, which can improve the adhesion over time. problem. FIG. 2 is a schematic diagram of a corona applied to the present invention, wherein the corona device 200 includes a corona roller 220, a plurality of transmission rollers 230, and a corona device 250. The polarizing plate 10 can be transmitted by the corona roller 220 and a plurality of transmission rollers 230. During the transmission process, the corona device 250 performs a corona discharge treatment on the first surface 121 of the protective film 12. Table 1 shows the test results of treating the first surface 121 of the protective film of the polarizing plate 10 with corona discharge and then bonding the adhesive layer 30. The bridging agent used in the adhesive formulations in the examples and comparative examples in Table 1 includes isocyanate compounds. The remaining materials can be selected from the materials disclosed in the foregoing description of the invention. The adhesive formulation is placed in a container with a mixer rotating speed of 250. Stir at a constant speed for 15 minutes at rpm, and then stand still to defoam. Apply the defoamed adhesive to the release film 20, put it in an oven to dry it, and take it out after drying to obtain an adhesive layer 30. Polarizing plate 10 The protective film 12 is alkalized with an aqueous potassium hydroxide solution. The polarizing film 11 is bonded to the protective film 12 to form a polarizing plate 10. The surface of the polarizing plate 10 is treated with a corona discharge at least once, and then the above-mentioned adhesive layer 30 and The polarizing plate 10 is tested after being cured for 7 days at a temperature of 23 ° C. and a relative humidity of 65%. Each test item is described after the table.

[Table 1]         <TABLE border = "1" borderColor = "# 000000" width = "85%"> <TBODY> <tr> <td> </ td> <td> Corona unit energy J / m <sup> 2 </ sup > </ td> <td> Initial adhesion N / 25mm </ td> <td> Adhesion N / 25mm over time </ td> <td> Potassium ion ppm </ td> <td> Trust (durable and durable ) Properties </ td> </ tr> <tr> <td> Heat resistance </ td> <td> Moisture and heat resistance </ td> <td> Cold and thermal shock resistance </ td> </ tr> <tr> <td> Example 1 </ td> <td> 60 </ td> <td> 1.87 </ td> <td> 3.55 </ td> <td> 5 </ td> <td> ○ </ td> <td> ○ </ td> <td> ○ </ td> </ tr> <tr> <td> Example 2 </ td> <td> 120 </ td> <td> 1.92 </ td> <td> 3.43 </ td> <td> 3 </ td> <td> ○ </ td> <td> ○ </ td> <td> ○ </ td> </ tr> <tr> <td> Example 3 < / td> <td> 240 </ td> <td> 1.78 </ td> <td> 3.25 </ td> <td> 3 </ td> <td> ○ </ td> <td> ○ </ td > <td> ○ </ td> </ tr> <tr> <td> Example 4 </ td> <td> 360 </ td> <td> 1.65 </ td> <td> 2.96 </ td> <td> 2 </ td> <td> ○ </ td> <td> ○ </ td> <td> ○ </ td> </ tr> <tr> <td> Comparative Example 1 </ td> < td> 0 </ td> <td> 1.55 </ td> <td> 7.02 </ td> <td> 12 </ td> <td> ○ </ td> <td> ○ </ td> <td> ○ </ td> </ tr> <tr> <td> Comparative Example 2 </ td> <td> 30 </ td> <td> 1.73 </ td> <td> 6.94 </ td> <td> 8 </ td> <td> ○ </ td> <td> ○ </ td> <td> ○ < / td> </ tr> </ TBODY> </ TABLE>

Among them, the calculation method of the corona unit energy is:

Initial adhesion test method: attach the adhesive layer to the polarizing plate, and mature it for 7 days at a temperature of 23 ° C and a relative humidity of 65%, and then cut the polarizing plate into 300mm * 25mm, and attach the adhesive layer to the glass substrate. After standing for one day after defoaming under pressure, the adhesive force was tested with a tensile machine at 300 mm / min. The adhesive force measured at this time is called "initial adhesive force".

Adhesion test method over time: Place the sample adhered to the glass substrate in the above-mentioned way, and place it in an environment with a temperature of 23 ° C and a relative humidity of 65% for 30 days, and then measure the glass adhesion with a tensile machine at 300mm / min. The adhesion is called "adhesion over time".

Test method for potassium ion content: After the protective film is microwave digested, the potassium ion content is analyzed by an inductively coupled plasma emission spectrometer (ICP-OES). The potassium ion content is positively correlated with the residual hydroxide content.

Reliability (durability and reliability) test methods: 1. Heat resistance test: After 500 hours of storage under dry conditions at 80 ° C, take it out for visual inspection. 2. Humidity and heat resistance test: After being stored for 500 hours at a temperature of 60 ° C and a relative humidity of 90%, take it out for visual inspection. 3. Cold and heat shock resistance test: The temperature is lowered from 80 ℃ to -30 ℃, and then heated to 80 ℃ as a cycle (0.5 hour). After repeating 200 cycles, it is taken out for visual inspection. Reliability test Appearance inspection criteria: X means severe appearance change (such as foaming, floating, peeling); △ means slight appearance change (such as foaming, floating, peeling); ○ means no appearance change (such as Foaming, floating, peeling).

It can be seen from Table 1 that the initial adhesion values of the examples and comparative examples are similar, but after the discharge treatment of a corona unit energy of 60 J / m ² or more, the metal ion content is between 1 and 5 ppm. The adhesion force can be between 1 ~ 5N / 25mm, and more preferably 2 ~ 4N / 25mm, so that the polarizer produced by the present invention can achieve better reworkability.

FIG. 3 shows a display panel module formed by using the concept of the present invention. The display panel module 2 of the polarizing plate 10 and the adhesive layer 30 prepared by the present invention can be attached to a substrate 50 of a liquid crystal panel after the release film 20 is removed. on. If the bonding adhesive layer 30 is poorly bonded to the substrate 50, it can be removed and then reworked. The polarizing plate 10 made according to the embodiment of the present invention is better to tear when heavy work is needed. After the tearing, there is less residual adhesive on the substrate 50 of the liquid crystal panel and less damage to the substrate 50 of the liquid crystal panel.

Because the protective film 12 of the present invention is subjected to the aforementioned alkalizing treatment, the first surface 121 that is in contact with the adhesive layer 30 is treated with a corona discharge treatment to remove a part of the alkaline substances remaining on the first surface 121, and then adhered to the adhesive layer 30. The first surface 301 of the layer 30 is in close contact. Finally, the polarizing plate 10 is adhered to the substrate 50 by using the second surface 302 of the adhesive layer 30. The second surface 302 of the adhesive layer 30 is in close contact with the substrate 50 to form a display panel module. 2. In one embodiment, the substrate 50 may be a glass substrate of a liquid crystal display panel or a touch panel module. The substrate 50 of the liquid crystal panel may be a color filter substrate or a thin film transistor substrate, but is not limited thereto. The formed display panel module 2 has reworkability, which can prevent the polarizing plate 10 or the substrate 50 from being damaged by an improper bonding process.

4 is a flowchart of a method for manufacturing a display panel module according to the present invention. In step 410, a protective film is provided. The protective film has a first surface and a second surface opposite to each other. Then, in step 420, the protection is treated with an alkali solution. Membrane, the lye contains metal ions and hydroxides, and the metal ions are positive monovalent metal ions or positive divalent metal ions. In some embodiments, the metal ions are potassium ions or sodium ions, but are not limited thereto; then in step 430 , Attaching the protective film and the polarizing film, for example, using an adhesive layer, and the adhesive layer may be a transparent adhesive layer made of an aqueous adhesive; and then in step 440, the first surface of the protective film is treated with corona discharge at least once. To remove part of the alkaline substance remaining on the first surface, wherein the unit energy of the corona is 60 J / m ² or more; and then in step 450, attach an adhesive layer on the first surface of the protective film to form an adhesive layer The adhesive may include an isocyanate-based bridging agent. At this step, the optical film of the present invention is completed. In step 460, the optical film obtained in step 450 is bonded to the substrate, and the adhesive layer of the optical film is bonded to the substrate. In one embodiment, the substrate may be a glass substrate of a liquid crystal display panel or a touch panel. The module, wherein the substrate of the liquid crystal display panel can be a color filter substrate or a thin film transistor substrate. After the laminating action is completed, the display panel module of the present invention is finally formed.

In summary, by further processing the surface of the protective film that will be in contact with the adhesive layer containing the bridging agent, the present invention can adjust the adhesion of the adhesive layer to the substrate in a simpler manner without changing the formula of the adhesive layer. This reduces the manufacturing cost of the display panel module polarizing plate by reducing the process loss.

1: Optical film 2: Display panel module 10: Polarizing plate 11: Polarizing film 12: Protective film 13: Adhesive layer 20: Release film 30: Adhesive layer 50: Substrate 121, 301: First surface 122, 302: Second surface 200: Corona device 220: Corona roller 230: Transmission roller 250: Corona device 410 ~ 460: Steps

FIG. 1 is a schematic diagram of an optical film structure according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a corona applied to the present invention. FIG. 3 is a schematic diagram of a display panel module according to an embodiment of the present invention. 4 is a flowchart of a manufacturing method of a display panel module according to an embodiment of the present invention.

Claims (12)

An optical film includes: a polarizing plate, including a polarizing film, a first protective film and a second protective film respectively located on two sides, and the content of potassium ion or sodium ion in the first protective film is 1 ~ 5ppm, the material of the first protective film includes cellulose triacetate, polymethyl methacrylate, polyethylene terephthalate, polypropylene, cycloolefin polymer, polycarbonate, or a combination thereof; and an adhesive A layer is formed on a surface of the first protective film. The adhesive layer is formed by an adhesive, and the adhesive includes a bridging agent. The optical film according to item 1 of the scope of patent application, wherein the adhesion of the adhesive layer to the glass over time is between 1 and 5 N / 25 mm. The optical film according to item 1 of the patent application range, wherein the adhesive further comprises a main agent and a silane coupling agent, and the main agent comprises a (meth) acrylate. The optical film according to item 1 of the patent application range, wherein the total amount of the bridging agent of the adhesive is 0.05 to 10% by weight, and / or the bridging agent is an isocyanate-based bridging agent. The optical film according to item 4 of the scope of patent application, wherein the isocyanate-based bridging agent is selected from toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, and hydrogenated diisocyanate. One or more isocyanates of toluene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, and the adduct obtained by reacting the one or more isocyanates with a polyol Or a dimer or trimer made of the one or more isocyanates. A display panel module includes: a display panel substrate; and the optical film according to any one of claims 1 to 5, wherein the adhesive layer of the optical film is bonded to the display panel substrate. . An optical film manufacturing method includes the steps of providing a protective film, wherein the protective film has a first surface and a second surface opposite to the first surface, and the material of the protective film includes cellulose triacetate and polymethylmethacrylate. Methyl acrylate, polyethylene terephthalate, polypropylene, cycloolefin polymer, polycarbonate, or a combination thereof; alkalizing the protective film; corona discharge treating the first surface of the protective film, wherein The unit energy of the corona is 60 J / m ² or more; and an adhesive layer is pasted on the first surface of the protective film, wherein the adhesive layer is formed by an adhesive. According to the method for manufacturing an optical film described in item 7 of the scope of the patent application, the method further includes attaching the second surface of the protective film to a polarizing film after the alkalizing treatment of the protective film. According to the optical film manufacturing method described in item 8 of the scope of patent application, the method further comprises, after the polarizing film is attached, performing the corona discharge treatment on the first surface of the protective film, and then applying the corona discharge treatment to the first surface of the protective film. The adhesive layer is adhered on a surface. The method for manufacturing an optical film according to item 7 of the scope of the patent application, wherein the protective film after alkali treatment and corona discharge treatment includes a metal ion, the metal ion is potassium ion or sodium ion, and / or the The content of metal ions is 1 to 5 ppm. The method for manufacturing an optical film according to item 7 of the application, wherein the adhesive comprises an isocyanate bridging agent. A method for manufacturing a display panel module includes the steps of: providing a display panel substrate; and bonding an optical film made by the optical film manufacturing method according to any one of claims 7 to 11 of the scope of application for a patent to In the display panel substrate, the adhesive layer of the optical film is bonded to the display panel substrate.