阅读说明：本技术 光学膜片、显示面板模块及其制造方法 (Optical film, display panel module and manufacturing method thereof ) 是由 陈文崇 郭建生 于 2017-05-23 设计创作，主要内容包括：本发明提供一种光学膜片,包括偏光板及黏着层,其中偏光板包括偏光膜及分别位于两侧的第一保护膜和第二保护膜,在第一保护膜内,金属离子的含量为1～5ppm；黏着层形成于第一保护膜的一表面上,由包含一架桥剂的黏着剂所形成；本发明同时提供一种相关的显示面板模块及其制造方法。(The invention provides an optical film, which comprises a polarizing plate and an adhesive layer, wherein the polarizing plate comprises a polarizing film, a first protective film and a second protective film, wherein the first protective film and the second protective film are respectively positioned on two sides of the polarizing film, and the content of metal ions in the first protective film is 1-5 ppm; the adhesive layer is formed on one surface of the first protective film and is formed by an adhesive containing a bridging agent; the invention also provides a related display panel module and a manufacturing method thereof.)

1. An optical film, comprising:

a polarizing plate including a polarizing film, and a first protective film and a second protective film respectively disposed on two sides of the polarizing film, wherein the first protective film has a first surface and a second surface opposite to the first surface, the second surface of the first protective film is attached to the polarizing film, and a content of a metal ion in the first protective film is 1-5 ppm;

an adhesive layer formed on the first surface of the first protective film, the adhesive layer being formed of an adhesive including a bridging agent; and

a glass substrate, wherein the adhesive layer is bonded to the glass substrate and the first surface of the first protective film;

wherein the adhesive layer has an adhesion to glass of 1 to 5N/25mm over time, wherein the adhesion over time is defined as follows: the glass substrate and the first protective film bonded by the adhesive layer are placed in an environment with a temperature of 23 ℃ and a relative humidity of 65% for 30 days, and then a glass adhesion force measurement is performed by a tensile machine at 300mm/min, wherein the measured adhesion force is the aged adhesion force.

2. The optical film according to claim 1, wherein the metal ion is an alkali metal ion or an alkaline earth metal ion.

3. The optical film according to claim 2, wherein the metal ion is a potassium ion or a sodium ion.

4. The optical film of claim 1, wherein the adhesive further comprises a host and a silane coupling agent, the host comprising (meth) acrylate.

5. The optical film according to claim 1, wherein the total amount of the bridging agent of the adhesive is 0.05-10 wt%, and/or the bridging agent is an isocyanate-based bridging agent.

6. The optical film according to claim 5, wherein the isocyanate based bridging agent is one or more isocyanates selected from the group consisting of toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, hydrogenated xylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, adducts of the one or more isocyanates with a polyol, or dimers or trimers of the one or more isocyanates.

7. A display panel module comprising:

a display panel substrate; and

the optical film according to any one of claims 1 to 6, wherein the adhesive layer of the optical film is bonded to the display panel substrate.

Technical Field

The invention relates to an optical film, a display panel module and a related manufacturing method; and more particularly, to an optical film with an alkalized polarizing plate, a display panel module, and related methods of manufacture.

Background

The composition and the manufacturing process of the polarizer are different day by day, and the difference affects the performance of the pressure sensitive adhesive layer coated later, so that the same adhesive used in different polarizers can show different adhesive force, for example, the adhesive containing a bridging agent is matched with the alkalized polarizer, and then the adhesive is attached on the liquid crystal display panel, and the problems of the pressure sensitive adhesive layer such as increased adhesive force and poor reworkability can be generated.

Disclosure of Invention

In order to solve the above problems, the present invention provides an optical film and a display panel module, which are applied to an alkalized polarizer and can improve reworkability, and further provides a method for manufacturing the optical film and the display panel module.

The invention provides an optical film, which comprises a polarizing plate and an adhesive layer, wherein the polarizing plate comprises a polarizing film, a first protective film and a second protective film, wherein the first protective film and the second protective film are respectively positioned on two sides of the polarizing film, and the content of metal ions in the first protective film is 1-5 ppm; the adhesive layer is formed on a surface of the first protective film and is formed of an adhesive including a bridging agent.

The invention further provides a display panel module, which comprises a display panel substrate and the optical film, wherein the adhesion layer of the optical film is bonded with the display panel substrate.

The invention also provides a manufacturing method of the optical film, which comprises the following steps: providing a protective film, wherein the protective film has a first surface and a second surface opposite to the first surface; alkalizing the protective film; corona discharge treating the first surface of the protective film, wherein a corona unit energy is 60J/m2 or more; and adhering an adhesive layer on the first surface of the protective film, wherein the adhesive layer is formed by an adhesive.

The invention also provides a manufacturing method of the display panel module, which comprises the following steps: providing a display panel substrate; and adhering the optical film manufactured by the optical film manufacturing method to a display panel substrate, wherein the adhesion layer of the optical film is jointed with the display panel substrate.

In summary, the present invention can adjust the adhesive force of the adhesive layer adhered to the substrate in a simpler manner by further processing the surface of the protective film contacting the adhesive layer containing the bridging agent without changing the formula of the adhesive layer, thereby improving the reworkability and reducing the manufacturing cost of the polarizing plate of the display panel module due to the reduction of the process loss.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

Fig. 1 is a schematic diagram of an optical film structure according to an embodiment of the invention.

Figure 2 is a schematic illustration 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 invention.

Fig. 4 is a flowchart of a method for manufacturing a display panel module according to an embodiment of the invention.

Wherein the reference numerals

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 unit

220: corona roller

230: transmission roller

250: corona machine

410-460: step (ii) of

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

exemplary embodiments that embody features and advantages of this disclosure are described in detail below in the detailed description. It will be understood that the present invention is capable of various modifications in various obvious respects, all without departing from the scope of the present invention, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.

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

In one embodiment, the protective film 12 on one or both sides may be a single or a plurality of layers. In one embodiment, one or both sides of the protective film 12 may be a functional protective film, such as a compensation film. In one embodiment, the optical film 1 may further include one or more other protective or functional optical films, such as layers that help with optical gain, alignment, compensation, turning, orthogonality, diffusion, protection, anti-sticking, scratch resistance, anti-glare, reflection suppression, high refractive index, and the like, such as alignment liquid crystal layers with controlled viewing angle compensation or birefringence (birefringence), easy-to-bond processing layers, hard coatings, anti-reflection layers, anti-sticking layers, diffusion layers, anti-glare layers, and various surface treatment layers.

The release film 20 may be made of polyethylene terephthalate (PET), polybutylene terephthalate, polycarbonate, polyarylate, polyester resin, olefin resin, cellulose acetate resin, acrylic resin, Polyethylene (PE), polypropylene (PP), cyclic olefin resin, or a combination thereof.

The adhesive layer 30 is formed of an adhesive, which in one embodiment may be a Pressure Sensitive Adhesive (PSA), and the adhesive mainly includes, but is not limited to: (A) the main agent, (B) a crosslinking agent, and (C) a silane coupling agent, and the respective compositions will be described below.

(A) A main agent:

the main agent comprises at least one (meth) acrylate, hereinafter, (meth) acrylate means either acrylate or methacrylate, and the remainder of the "meth" meaning can be analogized. The (meth) acrylates may be chosen, for example, from: linear alkyl (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, n-octyl (meth) acrylate, and undecyl (meth) acrylate; or may be selected, for example, from: branched alkyl (meth) acrylates such as isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and isooctyl (meth) acrylate; or may be selected, for example, from: alkyl (meth) acrylates substituted with an alkoxy group such as 2-methoxyethyl (meth) acrylate and ethoxymethyl (meth) acrylate. In addition, the (meth) acrylate may contain an aryl group such as benzyl (meth) acrylate and the like; alternatively, the (meth) acrylate may contain aryloxy groups such as 2-phenoxyethyl (meth) acrylate, 2- (2-phenoxyethoxy) ethyl (meth) acrylate, ethylene oxide-modified (meth) acrylate of nonylphenol, 2- (o-phenylphenoxy) ethyl (meth) acrylate, and the like. The cured and dried cross-linked (meth) acrylate is the main component and framework of the adhesive layer.

In one embodiment, the base may comprise the following formulation ratios: 40-90 parts by weight of Butyl Acrylate (BA), 10-40 parts by weight of Methyl Acrylate (MA), 1 part by weight or less of Acrylic Acid (AA), 5 parts by weight or less of 2-hydroxyethyl acrylate (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 base compound is 120 to 170 ten thousand, and the Mw/Mn is 3.5 to 5.

(B) A bridging agent:

the bridging agent can help (methyl) acrylate monomer in the main agent to generate crosslinking to form a net structure and improve the strength of the adhesive layer, the molecule of the bridging agent has at least two functional groups which can react with polar functional groups of (methyl) acrylate monomer in the main agent, and the bridging agent is selected from epoxy bridging agent, isocyanate bridging agent, imine bridging agent, metal chelating bridging agent and aziridine bridging agent, one or more of the bridging agents can be selected, the total amount of the bridging agents is 0.05-10 parts by weight or 0.05-10 parts by weight of the adhesive, if the proportion of the bridging agent is too low, partial adhesion can be increased, but the formed adhesive layer has insufficient cohesion and generates foaming phenomenon during high-temperature test.

The epoxy-based bridging agent may be selected from, for example: bisphenol a epoxy resins, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol triglycidyl ether, 1, 6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, N-diglycidylaniline, N' -tetraglycidyl-m-xylylenediamine, 1, 3-bis (N, N-diglycidylaminomethyl) cyclohexane, and the like.

The isocyanate-based crosslinking agent has at least two isocyanate groups (-NCO) in the molecule, and may be selected from, for example: toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylene diisocyanate, hydrogenated xylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, and the like. Further, the crosslinking agent may be obtained by using an adduct obtained by reacting the isocyanate compound with a polyhydric alcohol such as glycerin or trimethylolpropane, or by converting the isocyanate compound into a dimer or trimer.

The imine-based bridging agent may be selected, for example, from: diethylenetriamine and triethylene tetramine.

The metal chelate-based bridging agent may be selected from, for example: and compounds in which acetylacetone or ethyl acetoacetate is coordinated with a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, barium, chromium, and zirconium.

The aziridine-based bridging agent may be selected, for example, from: diphenylmethane-4, 4' -bis (1-aziridinecarboxamide), toluene-2, 4-bis (1-aziridinecarboxamide), triethylenemelamine, isophthaloylbis-1- (2-methylaziridine), tris-1-aziridinyloxyphosphine oxide, hexamethylene-1, 6-bis (1-aziridinecarboxamide), trimethylolpropane-tri- β -aziridinylpropionate, tetramethylolmethane-tri- β -aziridinylpropionate, and the like.

(C) Silane coupling agent:

the adhesive layer 30 is adhered with the polarizing plate 10 and is closely adhered to the substrate of the display panel, and in order to improve the adhesion between the adhesive layer and the substrate (especially glass substrate), a silane coupling agent is added, and one or more of the following silane coupling agents are selected, and the total amount of the silane coupling agents is 0.01-10 parts by weight. The silane coupling agent may be selected, for example, from: silane compounds containing polymerizable unsaturated groups (e.g., ethylenic bonds) such as vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, and 3-methacryloxypropyltrimethoxysilane; or may be selected, for example, from: silane compounds having an epoxy structure such as 3-glycidoxypropyltrimethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltriethoxysilane, and 3-glycidoxypropylethoxydimethylsilane; or may be selected, for example, from: amino group-containing silane compounds such as 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane; or may be selected, for example, from: silane compounds containing a halogen substituent such as 3-chloropropylmethyldimethoxysilane and 3-chloropropyltrimethoxysilane; others are, for example: 3-methacryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, and the like.

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

The adhesive layer 30 is formed by mixing the above adhesives by stirring, coating the mixture on the surface of the release film 20 subjected to the release treatment by standing and defoaming, and drying the mixture to form the adhesive layer 30, which is then bonded to the protective film by applying pressure.

As the polarizing film 11, a known metal polarizing film, an iodine polarizing film, a dye polarizing film, a polyethylene polarizing film, or the like can be used. In one embodiment, the polarizing film 11 is made of a material such as a polyvinyl alcohol (PVA) film containing dichroic pigments capable of being adsorbed and aligned or a liquid crystal material doped with absorption dye molecules.

The material of the protective film 12 is, for example, a group consisting of triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polypropylene (PP), Cyclic Olefin Polymer (COP), Polycarbonate (PC), or any combination thereof. In addition, the protective layer may be further subjected to a surface treatment such as an anti-glare treatment, an anti-reflection treatment, a hard coat treatment, a charge prevention treatment, or an anti-stain treatment.

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

In order to enhance the adhesion between the protective film 12 and the adhesive layer 13, before the protective film 12 is attached to the polarizing film 11, the protective film 12 is treated with an alkali solution, the alkali solution includes metal ions and hydroxide ions, the metal ions are monovalent metal ions (e.g., metal ions of the alkali metal family) or divalent metal ions (e.g., metal ions of the alkali earth family), in some embodiments, the metal ions are potassium ions or sodium ions, and the alkali solution is an aqueous solution of potassium hydroxide or aqueous solution of sodium hydroxide, but is not limited thereto.

In some embodiments, the concentration of the alkali solution is 1-8N, preferably 1-6N, and most preferably 3-5N. The alkalization treatment can be carried out at a temperature of more than 40 ℃, and can be adjusted according to different membrane materials, and in some embodiments, the treatment temperature is preferably between 50 ℃ and 60 ℃. In some embodiments, the alkalization treatment can be performed for 5 to 40 seconds, and more preferably for 10 to 30 seconds. The surface of the protective film 12 is then cleaned with pure water to remove most of the lye, in some embodiments for about 5 seconds, and finally oven dried. After the alkalization process, the surface roughness of the protective film 12 is increased, so that the adhesion force of the adhesive layer 13 to the protective film 12 can be improved, and the surface carboxylic acid group of the specific protective film 12 is converted into hydroxyl group, thereby facilitating the bonding of the protective film 12 and the polarizing film 11 by using an aqueous adhesive.

However, even though the first surface 121 of the protective film 12 after being alkalized is washed with water, alkaline substances, such as potassium hydroxide or sodium hydroxide, remain, and these remaining hydroxyl (OH-) will react with the bridging agent in the adhesive layer 30 in the subsequent process, taking isocyanate-based bridging agent as an example, the following reaction occurs:

the bridging agent originally reacts with (1) hydroxyl (-OH) of the copolymer in the main agent and (2) hydroxyl in silanol generated after hydrolysis of the silane compound, but after the bridging agent is consumed by hydroxyl, not only the degree of crosslinking of the adhesive layer 30 is reduced and the cohesion is affected, but also part of the hydroxyl in the main agent and the silane coupling agent does not participate in the reaction of the bridging agent, so that excessive hydroxyl remains in the adhesive layer 30, and after the adhesive layer 30 is bonded on a substrate (especially a glass substrate) of a panel, the excessive hydroxyl continuously forms hydrogen bonds with the hydroxyl on the surface of the substrate or forms covalent bonds after heating and dehydration, so that the adhesion is enhanced over time, and the adhesive layer 30 does not have reworkability any more.

After the protective film 12 is attached to the polarizing film 11, the present invention further uses Corona (Corona) to perform at least one Corona discharge treatment on the surface of the polarizing film, which is subsequently attached to the adhesive layer 30, i.e. the first surface 121 of the protective film, so as to reduce the content of alkaline substances remaining on the first surface 121 of the protective film 12 after the alkalization, thereby avoiding the hydroxyl remaining on the protective film 12 from reacting with the bridging agent first, and improving the problem of adhesion force over time. Fig. 2 is a schematic diagram of corona apparatus 200 according to the present invention, wherein corona apparatus 200 includes corona roller 220, conveying rollers 230, and corona device 250. The polarizer 10 may be transported by the corona roller 220 and the plurality of transport rollers 230, and the corona roller 250 performs a corona discharge treatment on the first surface 121 of the protective film 12 during the transportation. Table 1 shows the test results of attaching the adhesive layer 30 after the first surface 121 of the protective film of the polarizing plate 10 is treated with corona discharge. The bridging agent used in the adhesive formulations in the examples and comparative examples in table 1 comprises isocyanate compound, and the rest materials can be selected from the materials disclosed in the above description, placing the adhesive formulation into a container, stirring for 15 minutes at a constant speed of 250rpm of a stirrer, standing for defoaming, coating the defoamed adhesive on a release film 20, placing into an oven for drying, and taking out after drying to obtain an adhesive layer 30; the protective film 12 of the polarizing plate 10 was alkalified with an aqueous potassium hydroxide solution, the polarizing film 11 and the protective film 12 were laminated to form the polarizing plate 10, the surface of the polarizing plate 10 was treated with at least one corona discharge treatment, the adhesive layer 30 and the polarizing plate 10 were laminated, and the polarizing plate 10 was cured at a temperature of 23 ℃ and a relative humidity of 65% for 7 days, and then tests were performed, each test item being described later.

[ Table 1]

The calculation method of the unit energy of the corona comprises the following steps:

initial adhesion test method: adhering the adhesive layer to a polarizing plate, curing for 7 days at 23 ℃ and 65% relative humidity, cutting the polarizing plate into 300 mm/25 mm, adhering the polarizing plate to a glass substrate through the adhesive layer, pressurizing, defoaming, standing for one day, and testing the adhesion force by a tensile machine at 300mm/min, wherein the measured adhesion force is called as the initial adhesion force.

The method for testing the adhesive force with time comprises the following steps: after the sample attached to the glass substrate was placed in an environment of 23 ℃ and 65% relative humidity for 30 days in the above manner, the adhesion force of the glass was measured by a tensile machine at 300mm/min, and the adhesion force measured at this time was referred to as "aged adhesion force".

The potassium ion content testing method comprises the following steps: after microwave digestion of the protective film, the potassium ion content was analyzed by inductively coupled plasma emission spectrometer (ICP-OES), and the potassium ion content was positively correlated with the residual hydroxyl content.

Reliability (endurance reliability) test method:

1. heat resistance test: the resulting product was stored at 80 ℃ for 500 hours and then taken out for visual inspection.

2. Moisture and heat resistance test: the resulting product was stored at 60 ℃ and 90% relative humidity for 500 hours, and then taken out for visual inspection.

3. Cold and heat shock resistance test: the temperature was lowered from the 80 ℃ heating state to-30 ℃ and then raised to 80 ℃ as one cycle (0.5 hour), and the cycle was repeated 200 times, and then taken out for appearance inspection.

Reliability test appearance inspection determination criteria: x indicates the occurrence of a severe appearance change (e.g., foaming, floating, peeling); Δ indicates slight appearance change (e.g., foaming, floating, peeling); the appearance was not changed (e.g., foaming, floating, peeling).

As can be seen from Table 1, the initial adhesion values of the examples and comparative examples are similar, but the initial adhesion values are 60J/m in corona unit energy²After the discharge treatment, the content of metal ions is between 1 ppm and 5ppm, and the adhesive force of the glass during the time can be between 1N/25 mm and 5N/25mm, and is more preferably between 2N/25 mm, so that the polarizing plate prepared by the invention can achieve better reworkable effect.

Fig. 3 shows a display panel module formed by the inventive concept, in which the display panel module 2 is formed by peeling off the release film 20 and attaching the polarizer 10 and the adhesive layer 30 onto the substrate 50 of the liquid crystal panel. If the adhesion of the adhesive layer 30 to the substrate 50 is poor, the adhesive layer can be removed and reworked. The polarizing plate 10 manufactured by the embodiment of the invention is better torn off when needing rework, the residual glue on the substrate 50 of the liquid crystal panel after tearing off is less, and the damage to the substrate 50 of the liquid crystal panel is less.

After the protective film 12 of the present invention is subjected to the aforementioned alkalization treatment, the first surface 121 in contact with the adhesive layer 30 is subjected to corona discharge treatment to remove a portion of the alkaline substance remaining on the first surface 121, and then the protective film is tightly adhered to the first surface 301 of the adhesive layer 30, and finally the polarizing plate 10 is attached to the substrate 50 by using the second surface 302 of the adhesive layer 30, and the second surface 302 of the adhesive layer 30 is tightly adhered to the substrate 50, thereby forming the display panel module 2. In an embodiment, the substrate 50 may be a glass substrate of a liquid crystal display panel or a touch panel module, wherein the substrate 50 of the liquid crystal display 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, and can prevent the polarizing plate 10 or the substrate 50 from being damaged by an improper bonding process.

FIG. 4 is a flowchart illustrating a method for manufacturing a display panel module according to the present invention, in step 410, providing a protection film having a first surface and a second surface opposite to each other; then, in step 420, the protective film is treated with a lye solution, wherein the lye solution comprises metal ions and hydroxide radical, the metal ions are monovalent metal ions or divalent metal ions, and in some embodiments, the metal ions are potassium ions or sodium ions, but not limited thereto; then, in step 430, the protective film is attached to the polarizing film, for example, with an adhesive layer, which may be a transparent adhesive layer made of an aqueous adhesive; then in step 440, the first surface of the protective film is treated by at least one corona discharge to remove part of alkaline substances remained on the first surface, wherein the unit energy of corona is 60J/m²The above; then, in step 450, an adhesive layer is attached to the first surface of the protective film, and the adhesive for forming the adhesive layer may comprise an isocyanate-based bridging agentThe optical film of the invention is obtained. In step 460, the optical film obtained in step 450 is attached to a substrate, and the adhesion layer of the optical film is bonded to the substrate, in an embodiment, the substrate may be a glass substrate of a liquid crystal display panel or a touch panel module, wherein the substrate of the liquid crystal display panel may be a color filter substrate or a thin film transistor substrate, and after the attaching operation is completed, the display panel module of the present invention is finally formed.

In summary, the present invention can adjust the adhesive force of the adhesive layer adhered to the substrate in a simpler manner by further processing the surface of the protective film contacting the adhesive layer containing the bridging agent without changing the formula of the adhesive layer, thereby improving the reworkability and reducing the manufacturing cost of the polarizing plate of the display panel module due to the reduction of the process loss.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.