CN108931834B

CN108931834B - Polarizing structure and bonding method thereof

Info

Publication number: CN108931834B
Application number: CN201810918393.2A
Authority: CN
Inventors: 能木直安; 林明贤; 曾彦维; 林永泰; 杨以权
Original assignee: Sumika Technology Co Ltd
Current assignee: Sumika Technology Co Ltd
Priority date: 2018-07-25
Filing date: 2018-08-13
Publication date: 2021-02-02
Anticipated expiration: 2038-08-13
Also published as: CN108931834A; KR20200067264A; KR102264687B1; JP2020016873A; TWI706174B; JP6862496B2; TW202008014A

Abstract

The invention provides a polarizing structure and a bonding method thereof. The first polarizing plate and the second polarizing plate each include a polarizing film and a first protective film. The polarizing film has a first surface and a second surface opposite to each other. The first protective film is arranged on the first surface of the polarizing film. The joint piece joins the first protective film of the first polarizing plate and the first protective film of the second polarizing plate. The second protective film is formed on the whole second surface of the polarizing film of the first polarizing plate and the whole second surface of the polarizing film of the second polarizing plate. The technical scheme of the invention can reduce the times and/or working hours for replacing the polarizing structure in the cutting procedure, reduce the waste of calibration, increase the production efficiency and/or save the cost.

Description

Polarizing structure and bonding method thereof

Technical Field

The present invention relates to a polarizing structure and a bonding method thereof, and more particularly, to a bonded polarizing structure and a bonding method thereof.

Background

The conventional polarizing plate cutting process is to cut a single continuously extending polarizing plate into a plurality of polarizing unit plates. After the cutting of a single polarizing plate is completed, a new polarizing plate needs to be replaced, and then the subsequent cutting can be performed. However, replacing a new polarizing plate requires a few replacement steps, and cutting the polarizing unit plate requires many replacement steps.

Disclosure of Invention

The present invention is directed to a polarizing structure and a bonding method thereof, which can solve the problem of time consuming polarizer replacement when the polarizer is cut in the prior art.

An embodiment of the invention provides a polarization structure. The polarizing structure includes a first polarizing plate, a second polarizing plate, a first bonding element and a second protective film. The first polarizing plate and the second polarizing plate each include a polarizing film and a first protective film. The polarizing film has a first surface and a second surface opposite to each other. The first protective film is arranged on the first surface of the polarizing film. The first bonding member bonds the first protective film of the first polarizing plate and the first protective film of the second polarizing plate, or bonds the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate. The second protective film is formed on the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate and crosses the joint of the first polarizing plate and the second polarizing plate.

In one embodiment, the second protective film is formed on the entire second surface of the polarizing film of the first polarizing plate and the entire second surface of the polarizing film of the second polarizing plate.

In one embodiment, the second surface of the polarizing film of the first polarizing plate has two opposite first long sides, the second surface of the polarizing film of the second polarizing plate has two opposite second long sides, and the second protective film extends to the two first long sides and the two second long sides.

In one embodiment, the first fastener is coupled to the first protective film of the first polarizer and the first protective film of the second polarizer; the polarization structure further comprises:

a second bonding member bonding the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate;

wherein the second protective film covers the entire second joint member.

In one embodiment, a protrusion is formed on the second protective film at a position corresponding to the second bonding device.

In one embodiment, the first bonding member bonds the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate, and the second protective film covers the entire first bonding member.

In one embodiment, a protrusion is formed on the second protective film at a position corresponding to the first bonding device.

In one embodiment, the first protective film is one of a surface protective film and a release film, and the second protective film is the other of the surface protective film and the release film.

In one embodiment, the first polarizing plate and the second polarizing plate are each a continuous roll.

In one embodiment, the first bonding element includes a bonding layer and an adhesive layer, the adhesive layer is pre-formed on the bonding layer, and the thickness of the bonding layer is smaller than that of the adhesive layer.

An embodiment of the invention provides a method for bonding a polarization structure. The joining method includes the following steps. Providing a first polarizing plate and a second polarizing plate, wherein each of the first polarizing plate and the second polarizing plate comprises a polarizing film and a first protective film, each polarizing film has a first surface and a second surface opposite to each other, and each first protective film is disposed on the first surface of the corresponding polarizing film; bonding the first protective film of the first polarizing plate and the first protective film of the second polarizing plate or bonding the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate by a first bonding member; and forming a second protective film on the second surfaces of the polarizing films of the first and second polarizing plates and across the joint of the first and second polarizing plates.

In one embodiment, in the step of forming the second protective film, the second protective film is formed on the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate.

In one embodiment, the second surface of the polarizing film of the first polarizing plate has two opposite first long sides, and the second surface of the polarizing film of the second polarizing plate has two opposite second long sides; in the step of forming the second protection film, the second protection film extends to the two first long sides and the two second long sides.

In one embodiment, in the step of bonding with the first bonding member, the first bonding member bonds the first protective film of the first polarizing plate and the first protective film of the second polarizing plate; the polarization structure further comprises:

bonding the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate with a second bonding member;

wherein, in the step of forming the second protective film, the second protective film covers the entire second bonding member.

In one embodiment, in the step of forming the second protection film, a protrusion is formed at a position of the second protection film corresponding to the second bonding device.

In one embodiment, in the step of bonding with the first bonding member, the first bonding member bonds the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate;

wherein, in the step of forming the second protective film, the second protective film covers the entire first bonding member.

The invention has the beneficial effects that:

according to the technical scheme, the polarizing plates are all spliced into the polarizing structure before cutting, so that the polarizing structure has a larger length, the times and/or the working hours for replacing the polarizing structure in the cutting process can be reduced, for example, the polarizing structure is arranged on the cutting mechanism, and/or the polarizing structure is calibrated on the cutting mechanism, so that more polarizing unit plates can be cut in a certain working hour (such as the same working hour), the calibration waste is reduced, the production efficiency is increased, and/or the cost is saved.

Drawings

Fig. 1A is a bottom view of a polarization structure according to an embodiment of the invention.

FIG. 1B shows a cross-sectional view of the polarizing structure of FIG. 1A along direction 1B-1B'.

Fig. 1C is a schematic diagram illustrating bending of the polarization structure of fig. 1A.

Fig. 2 is a cross-sectional view illustrating a polarization structure according to another embodiment of the invention.

Fig. 3 is a cross-sectional view illustrating a polarization structure according to another embodiment of the invention.

Fig. 4A to 4C are diagrams illustrating a bonding process of the polarization structure of fig. 1.

Wherein, the reference numbers:

10: pressing mechanism

11: first transmission wheel set

11 a: first press-fit wheel

11 b: first roller

12: second transmission wheel set

12 a: second press-fit wheel

12 b: second roller

100. 200 and 300: polarizing structure

100': joint structure

110: a first polarizing plate

111. 121: polarizing film

111u, 121 u: first surface

111b, 121 b: second surface

111e1, 111e 2: first long side

1111. 1211: first cover layer

1112. 1212: polarizing layer

1113. 1213, and (3): second cover layer

112. 122: first protective film

113. 123: adhesive layer

120: the second polarizing plate

121e1, 121e 2: second long side

130. 130': first joint member

131. 261: bonding layer

132. 262: adhesive layer

140: second protective film

140 s: adhesive surface

150: adhesive member

260: second joint member

P1: protrusion part

Detailed Description

Referring to fig. 1A to 1C, fig. 1A is a bottom view of a polarization structure 100 according to an embodiment of the invention, fig. 1B is a cross-sectional view of the polarization structure 100 of fig. 1A along a direction 1B-1B', and fig. 1C is a schematic diagram illustrating the polarization structure 100 of fig. 1A being bent.

As shown in fig. 1B, the polarization structure 100 includes a first polarizing plate 110, a second polarizing plate 120, a first bonding member 130, a second protective film 140, and an adhesive member 150. The first polarizing plate 110 includes a polarizing film 111, a first protective film 112 and an adhesive layer 113. The polarizing film 111 has a first surface 111u and a second surface 111b opposite to each other. The first protective film 112 is disposed on the first surface 111u of the polarizing film 111. The second polarizing plate 120 includes a polarizing film 121, a first protective film 122 and an adhesive layer 123. The polarizing film 121 has a first surface 121u and a second surface 121b opposite to each other. The first protective film 122 is disposed on the first surface 121u of the polarizing film 121. The first joint 130 joins the first protective film 112 of the first polarizing plate 110 and the first protective film 122 of the second polarizing plate 120.

As shown in fig. 1A and 1B, the second protection film 140 is formed on the second surface 111B of the polarizing film 111 of the first polarizing plate 110 and the second surface 121B of the polarizing film 121 of the second polarizing plate 120 and spans the joint of the first polarizing plate 110 and the second polarizing plate 120, so as to enhance the overall strength of the polarizing structure 100. As shown in fig. 1C, when the polarizing structure 100 is bent, the joint C1 between the first polarizing plate 110 and the second polarizing plate 120 does not form a sharp bending shape (the sharp bending shape easily causes the bending of the polarizing structure 100), but presents a smooth arc shape, so that the strength of the polarizing structure 100 is strong enough to resist the bending force, thereby preventing the polarizing structure 100 from being easily broken.

In addition, as shown in fig. 1A and 1B, the facing two sides (not labeled) of the first polarizer 110 and the second polarizer 120 may be isolated from each other (if not in contact), or may be in contact with each other.

In one embodiment, the first protection film 112 is a surface protection film, and the second protection film 140 is a release film. In another embodiment, the first protection film 112 is a release film, and the second protection film 140 is a surface protection film.

The surface protective film and the release film protect the

polarizing films

111 and 121 from damage or contamination during processing, transportation, and the like. When the

polarizing films

111 and 121 are not required to be protected, for example, the polarizing

films

111 and 121 are attached to an optical member (not shown), one of the surface protective film or the release film may be peeled off, and then the

polarizing films

111 and 121 are attached to the optical member through the adhesive member 150 or the

adhesive layers

113 and 123.

In one embodiment, the first polarizer 110 and the second polarizer 120 are each a continuous roll.

After the polarizing plates (such as the first polarizing plate 110 and the second polarizing plate 120) are all bonded into the polarizing structure 100, a subsequent cutting process is performed, that is, the polarizing structure 100 has a larger length, and then the polarizing structure 100 is cut into a plurality of polarizing unit plates, which can be subsequently bonded to the optical member. The polarizing structure 100 may include two polarizing plates, or more polarizing plates, such as three, four or more polarizing plates. Compared with cutting a single polarizer, the polarizing structure 100 formed by combining a plurality of polarizers can be cut to form more polarizer units, thereby increasing the production efficiency. In addition, since all the polarizing plates are bonded into the polarizing structure 100 before cutting, the number of times and the man-hours for replacing the polarizing structure in the cutting process, for example, the man-hours for installing the polarizing structure 100 on the cutting mechanism and/or calibrating the polarizing structure 100 on the cutting mechanism, can be reduced, and more polarizing unit plates can be cut in a certain man-hour, and the waste of calibration can be reduced, so as to increase the production efficiency and save the cost. In addition, the present invention can check the quality of the polarizing plate before cutting (e.g. in the bonding process), and if the quality does not meet the specification (e.g. defect), the polarizing plate is not bonded, so as to ensure that all polarizing plates after the polarizing structure 100 is bonded have acceptable quality. Therefore, the cut polarizing unit plate does not need quality inspection or reduces quality inspection items, so as to increase the production efficiency.

The polarizing film 111 includes a first cover layer 1111, a polarizing layer 1112, and a second cover layer 1113. The material of the first cover layer 1111 and the second cover layer 1113 may be thermoplastic resin with excellent transparency, mechanical strength, thermal stability, moisture barrier property, and the like, and may include cellulose resin, acrylic resin, amorphous polyolefin resin, polyester resin, polycarbonate resin, and a combination thereof, and specifically may include polymethyl methacrylate (PMMA), and cellulose resin refers to a resin in which a part of the hydroxyl groups of cellulose is esterified with acetic acid, or a mixed ester in which a part of the hydroxyl groups is esterified with acetic acid and a part of the hydroxyl groups is esterified with other acids. The cellulose-based resin is preferably a cellulose ester-based resin, more preferably an acetyl cellulose-based resin such as triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, cellulose acetate butyrate and the like, and the cellulose sufficiently esterified is called triacetyl cellulose (TAC), acrylic resin film, polyaromatic hydroxyl resin film, polyether resin film, cyclic polyolefin resin film (e.g. polynorbornene resin film), polycarbonate-based resin such as a polyester formed from carbonic acid and a diol or bisphenol, such as: polyethylene Terephthalate (PET), Polypropylene (PP), Polyethylene (PE), amorphous polyolefin resins such as cyclic olefin monomer (co) polymers (COC/COP), ring-opened polymers of norbornene, cyclopentadiene, dicyclopentadiene, tetracyclododecene, or copolymers with olefins, Polycarbonates (PC), and any combination thereof. In addition, the first protective film material may be a thermosetting resin or an ultraviolet curing resin such as (meth) acrylic, urethane, acrylic urethane, epoxy, or silicone. In addition, the first cover layer 1111 and the second cover layer 1113 may further include at least one additive. The additive may be, for example, an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, an anti-coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a colorant, or the like.

The polarizing layer 1112 may be a polyvinyl alcohol (PVA) film adsorbing aligned dichroic pigments or formed of liquid crystal material doped with absorbing dye molecules. Polyvinyl alcohol can be formed by saponifying polyvinyl acetate. In some embodiments, the polyvinyl acetate may be a homopolymer of vinyl acetate or a copolymer of vinyl acetate and other monomers, and the like. The other monomer may be an unsaturated carboxylic acid, an olefin, an unsaturated sulfonic acid, a vinyl ether, or the like. In other embodiments, the polyvinyl alcohol may be modified polyvinyl alcohol, such as aldehyde modified polyvinyl formaldehyde, compounds such as polyvinyl acetaldehyde or polyvinyl butyral (COP), Polycarbonate (PC), or any combination thereof.

The polarizing film 121 includes a first cover layer 1211, a polarizing layer 1212, and a second cover layer 1213. The material of the first cover layer 1211 is similar to the first cover layer 1111, the material of the second cover layer 1213 is similar to the second cover layer 1113, and the material of the polarizing layer 1112 is similar to the polarizing layer 1212, which will not be described again.

The materials of the first

protective films

112 and 122 and the second protective film 140 may be, for example, thermoplastic resins having excellent transparency, mechanical strength, thermal stability, moisture barrier property, and the like. The thermoplastic resin may include a cellulose resin (e.g., triacetylcellulose), an acrylic resin (e.g., polymethylmethacrylate), a polyester resin (e.g., Polyethylene terephthalate, Polyethylene naphthalate), an olefin resin, a polycarbonate resin, a cyclic olefin resin, oriented tensile polypropylene, Polyethylene (PE), polypropylene, a cyclic olefin polymer, a cyclic olefin copolymer, or any combination thereof.

In one embodiment, the material of the first

protective films

112 and 122 may be thermosetting resin or ultraviolet curing resin, such as (meth) acrylic, urethane, acrylic urethane, epoxy, or silicone.

In an embodiment, the second protection film 140 may be, for example, a polyethylene terephthalate film coated with a release agent, such as, but not limited to, silicone.

As shown in fig. 1A, the second surface 111b of the polarizing film 111 (not labeled in fig. 1A) of the first polarizing plate 110 has two first long sides 111e1 and 111e 2. The second surface 121b of the polarizing film 121 (not labeled in fig. 1A) of the second polarizing plate 120 has two second long sides 121e1 and 121e 2. The second protective film 140 extends continuously to the first long sides 111e1 and 111e2 and the second long sides 121e1 and 121e 2. In other words, the second protection film 140 covers the entire second surface 111b of the polarizing film 111 of the first polarizing plate 110 and the entire second surface 121b of the polarizing film 121 of the second polarizing plate 120, so as to further enhance the overall strength of the polarizing structure 100.

As shown in fig. 1B, the adhesive layer 113 of the first polarizing plate 110 is formed between the polarizing film 111 and the first protective film 112, such that the first protective film 112 is adhered to the polarizing film 111 through the adhesive layer 113. The adhesive layer 123 of the second polarizer 120 is formed between the polarizing film 121 and the first protective film 122, such that the first protective film 122 is adhered to the polarizing film 121 through the adhesive layer 123. In addition, the adhesive layer 113 and/or the adhesive layer 123 may be a Pressure Sensitive Adhesive (PSA) made of a material including (meth) acrylic copolymer, such as a material including, but not limited to, functional groups, such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and the like.

As shown in fig. 1B, the first bonding member 130 includes a bonding layer 131 and an adhesive layer 132. Before the first bonding element 130 bonds the first polarizing plate 110 and the second polarizing plate 120, an adhesive layer 132 may be formed on the bonding layer 131 in advance to form the first bonding element 130. The first bonding member 130 is bonded to the first

protective films

112 and 122 by an adhesive layer 132 to bond the first polarizer 110 and the second polarizer 120. The material of the adhesive layer 132 is the same as or similar to the adhesive layer 113, and will not be described herein. In one embodiment, the adhesive layer 132 may be a silicon adhesive (silicon adhesive) and may have a thickness of about 0.03 μm to about 0.06 μm.

The bonding layer 131 may be a light-transmitting layer or a non-light-transmitting layer, and the color of the non-light-transmitting layer is, for example, white, black, or another color. The color of the non-transparent layer can indicate the joint of the first polarizing plate 110 and the second polarizing plate 120, so as to quickly identify the position of the joint. In one embodiment, the bonding layer 131 has a smaller thickness than the adhesive layer 132. In one embodiment, the thickness of the bonding layer 131 may be between about 0.01 μm and about 0.03 μm.

As shown in fig. 1B, the adhesive 150 is formed between the second protective film 140 and the polarizing film 111 and between the second protective film 140 and the polarizing film 121 to adhere the second protective film 140 and the

polarizing films

111 and 121. In detail, the second protection film 140 is formed on the second surface 111b of the polarizing film 111 and the second surface 121b of the polarizing film 121 of the second polarizing plate 120 through the adhesive 150. In addition, the second protection film 140 has an adhesion surface 140s, and the adhesive member 150 can cover at least a portion of the adhesion surface 140s of the second protection film 140, such as the entire adhesion surface 140 s.

As shown in fig. 1A, the adhesive 150 may continuously extend to the two first long sides 111e1, 111e2 of the polarizing film 111 and the two second long sides 121e1, 121e2 of the polarizing film 121. In other words, the adhesive member 150 covers the entire second surface 111b of the polarizing film 111 of the first polarizing plate 110 and the entire second surface 121b of the polarizing film 121 of the second polarizing plate 120. The material of the adhesive member 150 is the same as or similar to the adhesive layer 113, and will not be described herein.

In summary, as shown in fig. 1A, the top view area surrounded by the boundary of the first polarizer 110 and the boundary of the second polarizer 120 at least partially overlaps, e.g., completely overlaps, the top view area of the adhesive 150, and/or the top view area surrounded by the boundary of the first polarizer 110 and the boundary of the second polarizer 120 at least partially overlaps, e.g., completely overlaps, the top view area of the second protection film 140. In addition, the top view area of the second protection film 140 at least partially overlaps, e.g., completely overlaps, the top view area of the adhesive member 150.

Referring to fig. 2, a cross-sectional view of a polarization structure 200 according to another embodiment of the invention is shown. The polarizing structure 200 includes a first polarizing plate 110, a second polarizing plate 120, a first bonding member 130, a second protective film 140, an adhesive member 150, and a second bonding member 260.

The polarization structure 200 of the embodiment of the invention has similar or identical features and technical effects to those of the polarization structure 200, except that the polarization structure 200 further includes a second bonding element 260. The second bonding member 260 is bonded to the second surface 111b of the polarizing film 111 of the first polarizing plate 110 and the second surface 121b of the polarizing film 121 of the second polarizing plate 120 to bond the first polarizing plate 110 and the second polarizing plate 120, and the bonding member 150 and the second protective film 140 cover the entire second bonding member 260. Since the second joint 260 has a thickness, a protrusion P1 is formed at a position of the second protection film 140 and the adhesive member 150 corresponding to the second joint 260. In addition, the second bonding member 260 includes a bonding layer 261 and an adhesive layer 262, wherein the structure and/or material of the bonding layer 261 and the adhesive layer 262 are similar to or the same as the bonding layer 131 and the adhesive layer 132, respectively, and are not described herein again. In the embodiment, the second engaging member 260 is provided to provide better supporting force simultaneously with the first engaging member 130 on the upper and lower sides.

Referring to fig. 3, a cross-sectional view of a polarization structure 300 according to another embodiment of the invention is shown. The polarizing structure 300 includes a first polarizing plate 110, a second polarizing plate 120, a first bonding member 130', a second protective film 140, and an adhesive member 150.

The polarization structure 300 of the embodiment of the invention has similar or identical features and technical effects to those of the polarization structure 100, except that the first bonding element 130 'of the polarization structure 300 is bonded to the second surface 111b of the polarization film 111 of the first polarization plate 110 and the second surface 121b of the polarization film 121 of the second polarization plate 120, and the bonding element 150 and the second protection film 140 cover the entire first bonding element 130'. Since the first joint 130 'has a thickness, the second protective film 140 and the adhesive member 150 form a protrusion P1 at a position corresponding to the first joint 130'. In the embodiment, the first engaging member 130' and the second protective film 140 to be subsequently attached are disposed on the same side, so that the working sides are aligned, the process attaching direction and the winding mechanism can be conveniently disposed, and the efficiency can be further improved. In addition, the first engaging element 130' of the present embodiment has a structure and/or material similar to or the same as the first engaging element 130, which is not described herein again.

Fig. 4A to 4C are diagrams illustrating a bonding process of the polarization structure 100 of fig. 1.

As shown in fig. 4A, a first polarizing plate 110 and a second polarizing plate 120 are provided. The first polarizing plate 110 includes a polarizing film 111, a first protective film 112 and an adhesive layer 113. The polarizing film 111 has a first surface 111u and a second surface 111b opposite to each other. The first protective film 112 is disposed on the first surface 111u of the polarizing film 111. The adhesive layer 113 is formed between the polarizing film 111 and the first protective film 112 to adhere the polarizing film 111 and the first protective film 112. The second polarizing plate 120 includes a polarizing film 121, a first protective film 122 and an adhesive layer 123. The polarizing film 121 has a first surface 121u and a second surface 121b opposite to each other. The first protective film 122 is disposed on the first surface 121u of the polarizing film 121. The adhesive layer 123 is formed between the polarizing film 121 and the first protective film 122 to adhere the polarizing film 121 and the first protective film 122.

As shown in fig. 4B, the first protective film 112 of the first polarizing plate 110 and the first protective film 122 of the second polarizing plate 120 are adhered to each other by a first adhering device 130 using a bonding machine (not shown) or manually, so as to bond the first polarizing plate 110 and the second polarizing plate 120. The structure of fig. 4B is referred to as a bonding structure 100'. Before the bonding process or the step shown in fig. 4A, the quality of the polarizer may be checked in advance, and if the quality does not meet the specification (e.g., a defect), the bonding is not performed, so as to ensure that all the polarizers bonded by the polarizing structure 100 have acceptable quality. Thus, in the cutting process after the step shown in fig. 4C, the cut polarizer unit plates may not need quality inspection, or the quality inspection items may be reduced to increase the production efficiency.

Then, using the pressing mechanism 10 shown in fig. 4C, the adhesive 150 and the bonding structure 100' shown in fig. 4B are pressed to form the polarizing structure 100 shown in fig. 1B. As shown in fig. 4C, in the present embodiment, the adhesive member 150 may be pre-coated or disposed on at least a portion of the adhesive surface 140s of the second protective film 140, such as the entire adhesive surface 140 s. After the pressing, the second protection film 140 is adhered to the bonding structure 100' by the adhesive member 150. For example, the second protective film 140 is adhered to the entire second surface 111b of the polarizing film 111 of the first polarizing plate 110 and the entire second surface 121b of the polarizing film 121 of the second polarizing plate 120 by the adhesive 150.

In addition, the pressing mechanism 10 at least includes a first transmission wheel set 11 and a second transmission wheel set 12, wherein the first transmission wheel set 11 is used for transmitting the joint structure 100', and the second transmission wheel set 12 is used for transmitting the combined adhesive member 150 and the second protective film 140. The first transmission wheel set 11 and the second transmission wheel set 12 respectively include a first pressing wheel 11a and a second pressing wheel 12a, and the bonding structure 100', the bonded adhesive member 150 and the second protective film 140 are transmitted between the first pressing wheel 11a and the second pressing wheel 12a and pressed by the first pressing wheel 11a and the second pressing wheel 12a to form the polarization structure 100 shown in fig. 1B. In addition, the first transmission wheel set 11 and the second transmission wheel set 12 further include a first roller 11b and a second roller 12b, respectively, the first roller 11b is used for transmitting the bonding structure 100', and the second roller 12b is used for transmitting the bonded adhesive 150 and the second protective film 140.

Finally, the same pressing mechanism 10 or a different mechanism may be used to transmit the polarization structure 100 to a cutting die (not shown) to cut the polarization structure 100 into at least one polarization unit plate (not shown). Compared with cutting a single polarizer, the polarizer structure 100 formed by combining a plurality of polarizers has a larger length, so that more polarizer units can be cut to increase the production efficiency. In addition, since the polarizing structures 100 are formed by bonding a plurality of polarizing plates before cutting, and have a larger length, the number of times and/or the man-hours for replacing the polarizing structures in the cutting process can be reduced, for example, the man-hours for arranging the polarizing structures 100 on the cutting mechanism and/or for calibrating the polarizing structures 100 on the cutting mechanism, and more polarizing unit plates can be cut in a certain man-hour (e.g., the same man-hour), and the waste of calibration can be reduced, so as to increase the production efficiency and/or save the cost.

In another embodiment, the adhesive member 150 of fig. 4C may be pre-coated or disposed on the entire second surface 111B and the entire second surface 121B of the bonding structure 100' of fig. 4B. In this case, the first transmission wheel set 11 is used for transmitting the combined bonding structure 100' and the adhesive member 150, and the second transmission wheel set 12 is used for transmitting the second protection film 140. The second protection film 140, the bonded bonding structure 100' and the bonding member 150 are transmitted between the first pressing wheel 11a and the second pressing wheel 12a, and are pressed by the first pressing wheel 11a and the second pressing wheel 12a, so as to form the polarization structure 100 shown in fig. 1B.

The manufacturing method of the polarization structure 200 is similar to the polarization structure 100, except that the second surface 111B and the second surface 121B of the bonding structure 100' in fig. 4B are further bonded by the second bonding member 260 to bond the first polarizing plate 110 and the second polarizing plate 120, so as to further enhance the overall bonding strength of the first polarizing plate 110 and the second polarizing plate 120. The remaining manufacturing steps of the polarization structure 200 are similar to or identical to the corresponding steps of the polarization structure 100, and are not described herein again.

The manufacturing method of the polarizing structure 300 is similar to the polarizing structure 100, except that the first bonding element 130 bonds the second surface 111B and the second surface 121B of the bonding structure 100' of fig. 4B to bond the first polarizing plate 110 and the second polarizing plate 120. The remaining manufacturing steps of the polarization structure 300 are similar to or identical to the corresponding steps of the polarization structure 100, and are not described herein again.

The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A polarizing structure, comprising:

a first polarizing plate;

a second polarizer, wherein the first polarizer and the second polarizer each comprise:

a polarizing film having a first surface and a second surface opposite to each other; and

a first protective film disposed on the first surface of the polarizing film;

a first bonding member bonding the first protective film of the first polarizing plate and the first protective film of the second polarizing plate, or bonding the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate;

a second protective film formed on the entire second surface of the polarizing film of the first polarizing plate and the entire second surface of the polarizing film of the second polarizing plate across the joint of the first polarizing plate and the second polarizing plate;

wherein, the second protective film is a continuous film.

2. A polarization structure according to claim 1, wherein the second surface of the polarization film of the first polarization plate has two opposite first long sides, the second surface of the polarization film of the second polarization plate has two opposite second long sides, and the second protection film extends to the two first long sides and the two second long sides.

3. The polarization structure of claim 1, wherein the first bonding member bonds the first protection film of the first polarizing plate and the first protection film of the second polarizing plate; the polarization structure further comprises:

wherein the second protective film covers the entire second joint member.

4. A light polarizing structure according to claim 3, wherein the second protective film has a protrusion formed at a position corresponding to the second bonding element.

5. The polarization structure of claim 1, wherein the first bonding member bonds the second surface of the polarization film of the first polarization plate and the second surface of the polarization film of the second polarization plate, and the second protective film covers the entire first bonding member.

6. A light polarizing structure according to claim 5, wherein the second protective film has a protrusion formed at a position corresponding to the first bonding agent.

7. A light polarizing structure according to claim 1, wherein the first protective film is one of a surface protective film and a release film, and the second protective film is the other of the surface protective film and the release film.

8. A light polarizing structure according to claim 1, wherein the first polarizing plate and the second polarizing plate are each a continuous roll.

9. A light polarizing structure according to claim 1, wherein the first bonding member includes a bonding layer and an adhesive layer, the adhesive layer is pre-formed on the bonding layer, and the thickness of the bonding layer is smaller than that of the adhesive layer.

10. A method for bonding a polarizing structure, comprising:

providing a first polarizing plate and a second polarizing plate, wherein the first polarizing plate and the second polarizing plate respectively comprise a polarizing film and a first protective film, each polarizing film is provided with a first surface and a second surface which are opposite, and each first protective film is arranged on the first surface of the corresponding polarizing film;

bonding the first protective film of the first polarizing plate and the first protective film of the second polarizing plate or bonding the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate by a first bonding member; and

and forming a second protective film on the whole second surface of the polarizing film of the first polarizing plate and the whole second surface of the polarizing film of the second polarizing plate and crossing the joint of the first polarizing plate and the second polarizing plate, wherein the second protective film is a continuous film.

11. The method of claim 10, wherein the second surface of the polarizing film of the first polarizer has two opposite first long sides, and the second surface of the polarizing film of the second polarizer has two opposite second long sides; in the step of forming the second protection film, the second protection film extends to the two first long sides and the two second long sides.

12. The method for bonding a polarizing structure according to claim 10, wherein in the step of bonding with the first bonding member, the first bonding member bonds the first protective film of the first polarizing plate and the first protective film of the second polarizing plate; the polarization structure further comprises:

13. The method for bonding a polarizing structure as claimed in claim 12, wherein in the step of forming the second protective film, a protrusion is formed at a position of the second protective film corresponding to the second bonding member.

14. The method of claim 10, wherein in the step of bonding with the first bonding member, the first bonding member bonds the second surface of the polarizing film of the first polarizing plate and the second surface of the polarizing film of the second polarizing plate;

15. The method for bonding a polarizing structure as claimed in claim 14, wherein in the step of forming the second protective film, a protrusion is formed at a position of the second protective film corresponding to the second bonding agent.