TW201520613A - Polarizer and method of producing the same - Google Patents

Abstract

A polarizer and a method of producing the same are provided. A laminated body is clamped by a fixing device and a base of a grinding apparatus. And then, an edge of the laminated body is grinded by a grinding surface of a grinding device of the grinding apparatus with a given entrance angle to produce the polarizer with a great size precision.

Description

Polarizing plate and manufacturing method thereof

The present invention relates to a polarizing plate and a method of manufacturing the same, and more particularly to a polarizing plate having good dimensional accuracy and without overflowing, and a method of manufacturing the same.

The polarizing plate in the display can change the polarization direction of the light, and can improve the performance of the display, and achieve different display technologies, such as display technology of three-dimensional display or liquid crystal display. Generally, the polarizing plate comprises a polarizing film, an adhesive layer and a release layer, and the adhesive layer is disposed between the polarizing film and the release layer. The polarizing film can be adhered to the other optical film by the adhesive layer, and the release layer can prevent the adhesive layer of the polarizing plate from sticking to other objects, thereby improving the transportation convenience of the polarizing plate.

In order to mass-produce and meet the requirements of optical films of various sizes, a plurality of polarizing plates can be stacked into a laminated body, and at the same time, the laminated body is cut to an appropriate size.

However, when the cutting process described above is performed, since the mechanical properties of the polarizing plate are relatively flexible, the pressure applied during the cutting may cause slight deviation of each polarizing plate of the laminated body, and the dimensional accuracy after cutting is reduced. The performance of the subsequently produced display is reduced. In addition, the pressure applied during the cutting will make the adhesive layer of the polarized plate after the cutting easy to overflow from the side, so that the polarizing plates stick to each other or stick to other objects, thereby reducing the quality of the polarizing plate.

In view of the above, it is extremely desirable to provide a polarizing plate and a method of manufacturing the same to improve the defects of the conventional polarizing plate and the method of manufacturing the same.

Therefore, an aspect of the present invention provides a method of manufacturing a polarizing plate which is obtained by polishing a laminate by using a grinding device, and a polarizing plate having good dimensional accuracy and not easily overflowing can be obtained.

A method for manufacturing a polarizing plate, comprising: providing a grinding device, wherein the grinding device comprises: a base comprising a top surface of the base; a fixing device; and a grinding device comprising a grinding surface, a central axis and a reference a wire, wherein the grinding device has a radius, and the reference line is perpendicular to the extending direction of the central axis; a laminated body is placed on the top surface of the base of the base, wherein the laminated body comprises a polarizing unit, an edge and a grinding start Positioning; holding the laminated body by using the fixing device and the base, wherein the fixing device to the top mask of the base has a minimum holding distance, the minimum holding distance may have a midpoint position, and the midpoint position, the central axis and the reference line are coplanar; A polishing step is performed in which the polishing step is performed by polishing at least one edge of the laminate from the polishing starting position to remove a portion of the edge of the laminate to obtain at least one polarizing plate.

100‧‧‧ method

110‧‧‧Procedures for grinding equipment

120‧‧‧Steps of placing the laminated body on the top surface of the base so that the polarizing unit of the laminated body is parallel to the top surface of the base

130‧‧‧Steps of holding a laminate using a fixture and a pedestal

140‧‧‧Steps to determine whether the first height of the laminate is less than the holding distance

140a‧‧‧Set the stack on the upper or lower surface of the laminate so that the sum of the second height of the stack and the first height is equal to the holding distance

150‧‧‧Making the grinding step

160‧‧‧Steps to remove the fixture

170‧‧‧Steps for obtaining a polarizing plate

200‧‧‧ grinding equipment

210‧‧‧Base

210a‧‧‧top top of the base

220‧‧‧Fixed devices

230‧‧‧ grinding device

230a‧‧‧First direction of rotation

230b‧‧‧second direction of rotation

231‧‧‧Grinding surface

232‧‧‧ center axis

232a‧‧‧Extension direction

233‧‧‧ baseline

300‧‧‧Layer

300a‧‧‧ upper surface

300b‧‧‧ lower surface

300c‧‧‧ edge

310‧‧‧Polarized unit

310a‧‧‧Optical film

310b‧‧‧Adhesive film

310c‧‧‧ release layer

400‧‧‧Stacks

500a/500b‧‧‧ polarizing plate

510‧‧‧Optical film

510a/510b‧‧‧The outer edge

520‧‧‧ release layer

520a/520b‧‧‧ outer edge

530‧‧‧Adhesive film

530a/530b‧‧‧Outer rim

531‧‧‧First adhesive film

531a/531b‧‧‧The outer edge

533‧‧‧Second adhesive film

533a/533b‧‧‧Outer rim

Θ‧‧‧cut angle

D‧‧‧ Holding distance

H ₁ ‧‧‧first height

H ₂ ‧‧‧second height

C/C’‧‧‧ starting position

T/T’‧‧‧ thickness

d ₁ /d ₁ '/d ₂ /d ₂ '‧‧‧Retraction distance

FIG. 1 is a flow chart showing a method of manufacturing a polarizing plate according to an embodiment of the present invention.

[Fig. 2a] is a perspective view of a polishing apparatus in accordance with an embodiment of the present invention.

Figure 2b is a side elevational view of a polishing apparatus in accordance with an embodiment of the present invention.

[Fig. 3a] is a side view showing the laminating body placed on the base of the grinding apparatus in accordance with an embodiment of the present invention.

Figure 3b is a partial cross-sectional view showing a polarizing unit in accordance with an embodiment of the present invention.

[Fig. 3c] is a side view showing the grinding apparatus when the grinding step is performed in accordance with an embodiment of the present invention.

[Fig. 4a] is a side view showing a fixing device and a base holding laminate according to another embodiment of the present invention.

[Fig. 4b] is a side view showing a fixing device and a base holding laminate according to still another embodiment of the present invention.

[Fig. 5a] is a partial cross-sectional view showing a polarizing plate produced in accordance with the manufacturing method of the present invention.

Fig. 5b is a partial cross-sectional view showing another polarizing plate produced in accordance with the manufacturing method of the present invention.

The making and using of the embodiments of the invention are discussed in detail below. However, it will be appreciated that embodiments provide many applicable inventive concepts, Can be implemented in a wide variety of specific content. The specific embodiments discussed are illustrative only and are not intended to limit the scope of the invention.

Please refer to FIG. 1 , FIG. 2 a and FIG. 2 b , wherein FIG. 1 is a flow chart showing a method for manufacturing a polarizing plate according to an embodiment of the present invention, and FIGS. 2 a and 2 b are respectively diagrams according to the present invention. A perspective view and a side view of the grinding apparatus of the embodiment. In one embodiment, the method 100 first provides the grinding apparatus 200, as shown in step 110.

In the above embodiment, the polishing apparatus 200 includes a base 210, a fixture 220, and a grinding apparatus 230. The aforementioned polishing apparatus 230 includes an abrasive surface 231, a central axis 232, and a reference line 233, wherein the reference line 233 is perpendicular to the extending direction 232a of the central axis 232. In one embodiment, the polishing device 230 can be a roller, a wheel, a disk, any combination of the foregoing, or other suitable polishing device.

Please refer to FIG. 1 and FIG. 3a simultaneously. FIG. 3a is a side view showing the laminated body placed on the base of the grinding apparatus according to an embodiment of the present invention. After step 110, as shown in step 120 and FIG. 3a, the laminated body 300 is placed on the base top surface 210a of the base 210. The laminated body 300 can include at least one polarizing unit 310, and then the extending surface of the at least one polarizing unit 310 is parallel to the top surface 210a of the base. Then, the laminated body 300 is held by the fixing device 220 and the susceptor 210, as shown in step 130 and FIG. 3a.

Referring to Figure 3a, the fastening means 220 to the top surface of the base 210a having a minimum pinching distance D, the laminate 300 having a first height H _1, and the first height H ₁ is less than or equal to distance D. sandwiched In one embodiment, the position of the holding distance D, that is, the position of D/2, the central axis 232 of the polishing apparatus 230, and the reference line 233 of the polishing apparatus 230 are coplanar.

In one embodiment, the double radius 2R of the central axis 232 of the polishing apparatus has a ratio to the holding distance D, and the ratio is between 1/15 and 1/3.

Please refer to FIG. 3a and FIG. 3b, wherein FIG. 3b is a partial cross-sectional view of a polarizing unit according to an embodiment of the invention. In one embodiment, each of the polarizing units 310 may include at least one optical film 310a, at least one adhesive film 310b, and at least one release layer 310c, wherein the adhesive film 310b is disposed on the optical film 310a and is separated from the film. Between layers 310c. In one embodiment, the optical film 310a or the release layer 310c is in contact with the base top surface 210a or the fixture 220. In another embodiment, the polarizing unit may further comprise two or more adhesive films and two or more release layers, and the adhesive films are respectively disposed between the optical film and one of the release layers. In another embodiment, the polarizing unit may also include two or more optical films.

In an embodiment, when the fixing device 220 and the susceptor 210 hold the laminated body 300, the pressure generated in the holding state will slightly squeeze the adhesive film 310b in the polarizing unit 310 of the laminated body 300 to cause the glue to overflow. .

Referring to FIG. 1 , after step 130 , it is determined whether the first height H _{1 of the} laminated body 300 is equal to the holding distance D, as shown in step 140 . When the first height H ₁ is equal to the holding distance D, a grinding step is performed, as shown in step 150.

When the step 140 determines that the first height H _{1 is} less than the holding distance D, the fixing device 220 and the base 210 cannot effectively hold the laminated body 300. Therefore, the method 100 further performs the step 140a to perform the subsequent grinding step 150.

Please refer to FIG. 1 , FIG. 4 a and FIG. 4 b , wherein FIG. 4 a and FIG. 4 b are respectively side views of a fixing device and a base holding laminated body according to another embodiment and another embodiment of the present invention. When the step 140 determines that the first height H _{1 is} less than the holding distance D, as shown in step 140a, the stack 400 may be disposed on the upper surface 300a of the laminated body 300, as shown in FIG. 4a; or the lower surface 300b, such as As shown in FIG. 4b, the sum of the second height H _{2 of} the stack 400 and the first height H ₁ is equal to the holding distance D, so that the fixing device 220 and the susceptor 210 effectively hold the laminated body 300 by the stack 400, and A subsequent grinding step 150 is performed.

Please refer to FIG. 1 and FIG. 3c, wherein FIG. 3c is a side view of the grinding apparatus when the grinding step is performed according to an embodiment of the present invention. When the grinding step 150 is performed, the user can adjust the moving distance of the fixing device 220, and/or the base 210, and/or the grinding device 230 in the horizontal direction or the vertical direction according to the size requirement of the polarizing plate to be obtained. Thereby, the position of the moving layered body 300 is associated with the position of the holding distance D, that is, the position of D/2, the central axis 232 of the polishing apparatus 230, and the reference line 233 of the polishing apparatus 230 are coplanar. Next, the polished surface 231 of the polishing apparatus 230 is used to polish the edge 300c of the laminated body 300 at a predetermined plunging angle θ to adjust the amount of polishing of the laminated body 300, thereby removing a part of the edge 300c of the laminated body 300.

The above-described plunging angle θ means an angle formed by the line C or C' at which the polishing surface 231 of the polishing apparatus 230 grinds the laminated body, and the line connecting the central axis 232 of the polishing apparatus 230 and the reference line 233. According to the above definition, the plunging angle θ is 0° when the starting position C or C' of the laminated body is parallel to the reference line 233.

When the aforementioned starting position is C, the polishing surface 231 of the polishing apparatus 230 grinds the edge 300c of the laminated body 300 in the first rotational direction 230a. Here, the first rotational direction 230a refers to the direction from the upper surface 300a of the laminated body 300 to the lower surface 300b, and the cut-in angle θ is defined as a positive value.

In another mode, when the aforementioned starting position is C', the polishing surface 231 of the polishing apparatus 230 grinds the edge 300c of the laminated body 300 in the second rotational direction 230b. Here, the second rotational direction 230b refers to the direction from the lower surface 300b of the laminated body 300 to the upper surface 300a, and the cut-in angle θ is defined as a negative value.

The aforementioned plunging angle satisfies the following formula (I):

In the formula (I), θ represents the plunging angle, D represents the holding distance, and R represents the radius of the grinding device. In the present embodiment, the plunging angle θ may be between -70° and 70°.

If the position of the holding distance D, the central axis 232, and the reference line 233 are not coplanar, the central axis 232 of the polishing apparatus 230 will be higher or lower than the midpoint of the holding distance D. When the central axis 232 is higher than the midpoint of the holding distance D, the angle of the plunging angle θ is less than 70° for the polarizing unit 310 at the upper portion of the laminated body 300; for the polarizing unit 310 at the lower portion of the laminated body 300 The angle of the plunging angle θ is greater than 70°. base For the same moving distance, the polarizing unit 310 of the upper portion and the lower portion of the laminated body 300 may have unequal portions of the polished portion, that is, the upper polarizing unit 310 and the lower polarizing unit 310 have different grinding amounts, and are reduced. The dimensional accuracy of the polarizing plate produced by the grinding is improved, and the polarizing plate produced has the defect of overflowing.

The polarizing unit 310 at the upper portion of the laminated body 300 refers to the polarizing unit 310 whose stacking position is higher than the position of the holding point D; otherwise, the polarizing unit 310 at the lower portion of the laminated body 300 means that the stacking position is lower than the holding distance D The polarizing unit 310 at the point position.

On the other hand, when the central axis 232 is lower than the midpoint of the holding distance D, the angle of the plunging angle θ is greater than 70° for the polarizing unit 310 at the upper portion of the laminated body 300; the polarizing unit for the lower portion of the laminated body 300 For 310, the angle of the plunging angle θ is less than 70°. Accordingly, the polarizing plate produced by the grinding also has the defects of poor dimensional accuracy and overflowing.

In addition, if the first height H _{1 of the} laminated body 300 is greater than the holding distance D, the adhesive film in the polarizing unit 310 of the laminated body 300 is completely squeezed except that the fixing device 220 and the susceptor 210 are less likely to hold the laminated body 300. Therefore, the obtained polarizing plate does not have an adhesive film, and thus cannot be applied.

Secondly, when the first height H _{1 is} greater than the holding distance D, the grinding surface 231 also grinds at least one edge 300c of the laminated body 300 with a larger cutting angle θ, such as greater than 70°, and reduces the obtained polarizing plate. The dimensional accuracy.

Referring to FIG. 1, after the grinding step 150, as shown in steps 160 and 170, the grinding apparatus 200 and the fixing device 220 are removed to obtain At least one polarizing plate. Accordingly, in the present invention, each of the polarizing units 310 of the laminated body is polished by a grinding step so that the polarized light unit 310 after the polishing forms a polarizing plate.

Referring to FIG. 5a, a partial cross-sectional view of a polarizing plate produced in accordance with the manufacturing method of the present invention is shown. The polarizing plate 500a includes an optical film 510, a release layer 520, and an adhesive film 530. The outer edge portions 520a or 520b of the release layer 520 are respectively aligned with the outer edge portions 510a or 510b of the optical film 510, and the adhesive film 530 is disposed between the optical film 510 and the release layer 520.

After the aforementioned fixing device 220 is removed, the outer edge portion 530a or 530b of the adhesive film 530 is more retracted than the outer edge portions 510a or 510b of the optical film 510, respectively, due to the release of the holding pressure and the cohesion of the self.

Secondly, due to the rough surface of the polishing surface of the polishing apparatus and the aforementioned cohesive force, when the adhesive film 530 is retracted, the outer edge portion 530a or 530b of the adhesive film 530 may have an irregular surface after being ground. In an embodiment, the irregular surface may be a continuous curved surface. In an embodiment, the irregular surface may include at least one curved surface. In another embodiment, the outer edge portion 530a or 530b of the adhesive film 530 may be a circular arc surface or a sawtooth surface. In an embodiment, the irregular surface may be a continuous curved surface.

Based on the two outer edge portions 510a or 510b of the optical film 510 as a starting point, the irregular faces of the two outer edge portions 530a or 530b of the adhesive film 530 may have a maximum retraction distance d ₁ and d ₂ . The maximum retraction distance d ₁ is a vertical distance measured by measuring the maximum retracted position of the adhesive film 530 to the line connecting the outer edge portion 510a of the optical film 510 and the ipsilateral outer edge portion 520a of the release layer 520. The measurement method of the maximum retraction distance d _{2 is} the same as the above method, and will not be described again.

Wherein, the ratio of any maximum retraction distance d ₁ or d ₂ to the thickness T of the adhesive film 530 does not exceed 1.8. In one embodiment, the ratio of any maximum retraction distance d ₁ or d ₂ to the thickness T of the adhesive film 530 is between 0.25 and 1.8.

When the ratio of the maximum contraction distance d ₁ or d ₂ to the thickness T exceeds 1.8, the adhesion area of the adhesive film 530 of the polarizing plate is reduced, so that the polarizing plate is not easily attached to other optical films or causes The liquid crystal display module leaks light, which in turn affects its application.

The thickness of the adhesive film 530 of the optical film 510 is generally not particularly limited, but in an embodiment, the thickness of the adhesive film 530 may be, for example, 5 μm to 50 μm.

In one embodiment, the optical film 510 may be, for example, a polarization conversion element, a reflector, or a semi-transmissive plate, a phase difference plate, a viewing angle compensation film, a brightness enhancement film, a protective film, an alignment liquid crystal layer, an easy-bonding treatment layer, Various surface treatment layers such as a hard coat layer, an antireflection layer, a release layer, a diffusion layer, and an antiglare layer. In an embodiment, the optical film 510 can be a plurality of layers, and the plurality of layers can be a combination selected from the above.

In an embodiment, the material of the release layer 520 may be selected from synthetic resin films such as polyethylene, polypropylene, polyethylene terephthalate; rubber sheets, paper, cloth, non-woven fabric, mesh, and foamed sheets. , a metal foil and a suitable thin layer of such laminates.

In an embodiment, the material of the adhesive film 530 may be selected from the group consisting of formulating an acrylic oligomer and a decane coupling agent in an acrylic polymer, or adding a photopolymerization initiator to the acrylic polymer, and irradiating ultraviolet rays. A compound obtained by adding (UV) or an antistatic component to an acrylic polymer.

Referring to FIG. 5b, a partial cross-sectional view of another polarizing plate produced in accordance with the manufacturing method of the present invention is shown. The polarizing plate 500b includes an optical film 510, a two-dimensional layer 520, a first adhesive film 531 and a second adhesive film 533. The two outer edge portions 520a or 520b of the two release layers 520 are respectively aligned with the two outer edge portions 510a or 510b of the optical film 510, and are disposed on two sides of the optical film 510, respectively. The first adhesive film 531 and the second adhesive film 533 are respectively disposed between the optical film 510 and the two release layers 520.

Similarly, due to the influence of the cohesive force, the outer edge portion 531a or 531b of the first adhesive film 531 and the outer edge portion 533a or 533b of the second adhesive film 533 are respectively smaller than the outer edge portions 510a or 510b of the optical film 510. The outer edge portion 531a, 531b, 533a or 533b of the first adhesive film 531 or the second adhesive film 533 may have an irregular surface. In an embodiment, the irregular surface may include at least one curved surface. In an embodiment, the irregular surface may be a continuous curved surface. In another embodiment, the outer edge portion 531a, 531b, 533a or 533b of the first adhesive film 531 or the second adhesive film 533 may also be a circular arc surface or a sawtooth surface.

Based on the outer edge portion 510a or 510b of the optical film 510 as a starting point, the irregular surface of the outer edge portion 531a, 531b, 533a or 533b of the first adhesive film 531 or the second adhesive film 533 may have a maximum retracting distance. d ₁ , d ₂ , d ₁ ' and d ₂ '. The measurement methods of the maximum retraction distances d ₁ , d ₂ , d ₁ ', and d ₂ ' are the same as those described in the above embodiments, and will not be described again.

In one embodiment, the thickness T of the first adhesive film 531 is different from the thickness T' of the second adhesive film 533. In one embodiment, the first adhesive film 531 has a thickness T of about 50 μm to 250 μm, and the second adhesive film 533 has a thickness T' of about 5 μm to 50 μm.

Wherein, the ratio of the maximum retraction distance d ₁ or d ₂ to the thickness T of the first adhesive film 531 does not exceed 1.8, and the ratio of the retraction distance d ₁ ' or d ₂ ' to the thickness T' of the second adhesive film 533 is not More than 1.8. In an embodiment, the ratio of the maximum retraction distance to the thickness T of the indentation distance d ₁ or d ₂ may be between 0.25 and 1.8, and the maximum retraction distance of the retraction distance d ₁ ' or d ₂ ' The ratio of the thickness T' can be between 0.25 and 1.8.

Similarly, when the ratio of the contraction distance of the first adhesive film 531 or the second adhesive film 533 to the thickness T or T' exceeds 1.8, the first adhesive film 531 or the second adhesive film 533 of the polarizing plate 500b is obtained. The adhesive adhesion area is reduced, so that the polarizing plate is not easy to be attached to other optical films or the liquid crystal display module is leaked, thereby affecting its application.

The following examples are used to illustrate the application of the present invention, and are not intended to limit the present invention, and various modifications and refinements can be made without departing from the spirit and scope of the invention.

Preparation of polarizing plate Example 1

Referring to FIG. 3 a to FIG. 3 c , the laminated body 300 is first placed on the susceptor 210 , and the laminated body 300 is clamped by the fixing device 220 and the pedestal 210 . The laminated body 300 includes a plurality of polarizing units 310 , and the polarizing units Each of the 310 includes at least one adhesive film 310b, and the adhesive film 310b is disposed between the optical film 310a and the release layer 310c. In this embodiment, the first height H _{1 of the} laminated body 300 is equal to the holding distance D between the fixture 220 and the base 210.

Then, the polishing surface 231 of the polishing apparatus 230 is polished to the laminated body 300 at a cutting angle θ of 70°. After the grinding step, the polarizing plate of Example 1 was obtained, and its structure was as shown in Fig. 5a. The obtained polarizing plate was evaluated in the following evaluation manner, and the evaluation results are shown in Table 1, and the method for detecting the polishing quality and the degree of shrinkage will be described later.

Example 2 to Example 6 and Comparative Example 1 to Comparative Example 4

In Example 2 to Example 6 and Comparative Example 1 to Comparative Example 4, a polarizing plate was prepared in the same manner as in Example 1. The difference between the two embodiments is that the laminates 300 of different structures are ground by using different plunging angles, wherein the adhesive films are used when the polarizing unit 310 comprises a two-layer adhesive film. They are respectively disposed on both sides of the optical film, and in the adhesive film, the release layer is disposed on the other side away from the optical film, and the structural diagram after the manufacture is completed is shown in FIG. 5b. The conditions and evaluation results of Examples 2 to 6 and Comparative Examples 1 to 4 are shown in Table 1, and are not described here.

Evaluation method

1. Grinding quality

The polarizing plates obtained in the above-mentioned Embodiments 1 to 6 and Comparative Examples 1 to 4 can evaluate the polishing quality of the polarizing plate according to the dimensional accuracy and the overflow condition after polishing.

It is stated that the dimensional accuracy of the polarizing plate is that the polarizing plates prepared in Embodiments 1 to 6 and Comparative Examples 1 to 4 are placed on a horizontal platform, and the polarizing plate is kept in a flat state, and the caliper is measured. The size of the polarizer is measured and the error value of the polarizer is calculated. The calculated dimensional error values were evaluated according to the following criteria: ◎: dimensional error value ≦ ± 0.1 mm; ○: ± 0.1 mm < dimensional error value ≦ ± 0.2 mm; ×: ± 0.2 mm < size error value .

The evaluation method of the above-mentioned overflow condition is to visually judge whether or not the adhesive film of the polarizing plate overflows.

2. Degree of contraction

The degree of retraction of the adhesive film of the polarizing plate prepared by the invention is calculated according to the following formula (II), wherein the maximum retraction distance of the adhesive film is measured by an optical microscope, and the method of measuring the maximum retraction distance of the adhesive film The manners described in the above embodiments are not described again:

According to the results of the first table, when the polishing surface of the polishing apparatus grinds the laminated body at a cutting angle θ of 70° to -70°, the polarizing plate produced has good dimensional accuracy, and the adhesive film of the polarizing plate is not easy. Overflow can reduce the contamination of the adhesive and reduce the occurrence of sticking of the polarizing plate with other optical films, thereby improving the yield of the polarizing plate process and the quality of the polarizing plate.

Next, when the laminated body is polished by the above-mentioned cutting angle θ of 70° to -70°, the degree of shrinkage of the adhesive film obtained by the polarizing plate, that is, the ratio of the shrinkage distance of the adhesive film to the thickness is greater than 0 and not more than 1.8. And to ensure that the polarizer can effectively fit with other optical films.

In addition, when the plunging angle θ is not 70° to -70°, the dimensional accuracy of the polarizing plate produced is not good, and the adhesive film of the polarizing plate is not retracted, so that the adhesive film of the polarizing plate is easy to overflow, and further Reduce the quality of the polarizer.

The present invention has been disclosed in the above embodiments, and is not intended to limit the present invention. Any one of ordinary skill in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

100‧‧‧ method

110‧‧‧Procedures for grinding equipment

120‧‧‧Steps of placing the laminated body on the top surface of the base so that the polarizing unit of the laminated body is parallel to the top surface of the base

130‧‧‧Steps of holding a laminate using a fixture and a pedestal

140‧‧‧Steps to determine whether the first height of the laminate is less than the holding distance

140a‧‧‧Set the stack on the upper or lower surface of the laminate so that the sum of the second height of the stack and the first height is equal to the holding distance

150‧‧‧Making the grinding step

160‧‧‧Steps to remove the fixture

170‧‧‧Steps for obtaining a polarizing plate

Claims (10)

A manufacturing method of a polarizing plate, comprising: providing a grinding device, wherein the grinding device comprises: a base comprising a top surface of the base; a fixing device; and a grinding device comprising a grinding surface, a central axis and a a reference line, wherein the grinding device has a radius, and the reference line is perpendicular to the extending direction of the central axis; a laminated body is disposed on the top surface of the base of the base, wherein the laminated body comprises a polarizing unit, An edge and a grinding start position; the layer is held by the fixing device and the base, wherein the fixing device has a holding distance to the top mask of the base, and the holding distance may have a midpoint position, and the middle a point position, the central axis and the reference line are coplanar; and performing a grinding step, wherein the grinding step uses the polishing surface to polish at least one edge of the laminated body from the polishing starting position to remove the laminated body Part of the edge, and the at least one polarizing plate is produced. The method for manufacturing a polarizing plate according to claim 1, wherein an angle formed by the line connecting the grinding start position and the central axis and the reference line is defined as an all-in angle θ, and the plunging angle θ Satisfy the following formula (I): In the formula (I), the D represents the holding distance, and the R represents the radius of the grinding device. The method for producing a polarizing plate according to claim 2, wherein the cutting angle θ is -70 to 70. The method of manufacturing a polarizing plate according to claim 1, wherein the laminated body has a first height, and the first height is less than or equal to the holding distance. The method for manufacturing a polarizing plate according to claim 1, wherein the laminated body comprises an upper surface and a lower surface, and the upper surface and the lower surface are respectively adjacent to the edge, and wherein the polishing surface is The upper surface of the laminated body grinds the edge toward the lower surface of the laminated body, or the polished surface grinds the edge from the lower surface of the laminated body toward the upper surface of the laminated body. The method for manufacturing a polarizing plate according to claim 1, wherein the double radius of the central axis has a ratio to the holding distance, and the ratio is between 1/15 and 1/3. A polarizing plate comprising: an optical film having a first outer edge portion; a release layer having a second outer edge portion, wherein the second outer edge portion is aligned with the first outer edge portion; An adhesive film having a third outer edge portion and a first thickness, and the adhesive film is disposed between the optical film and the release layer, wherein the third outer edge portion of the adhesive film is respectively different from the first outer portion The edge portion or the second outer edge portion is retracted and has a first maximum retraction distance, wherein the first maximum retraction distance and the first thickness ratio of the adhesive film are greater than 0 and not more than 1.8. The polarizing plate of claim 7, wherein the third outer edge portion of the adhesive film has an irregular surface, a continuous curved surface, a circular arc surface or a sawtooth surface, and the third outer edge portion Can contain a curved area. The polarizing plate of claim 7, further comprising: a second adhesive film having a fourth outer edge portion and a second thickness, wherein the second adhesive film is disposed on the optical film relative to the optical film The other side of the first adhesive film; and a second release layer disposed on the other side of the second adhesive film with respect to the optical film, and the second release layer has a fifth outer edge portion, And the second outer edge portion of the second adhesive film is retracted from the first outer edge portion or the fifth outer edge portion, and has a second maximum retracting distance. The second maximum indentation distance and the second thickness ratio of the second adhesive film are greater than 0 and not more than 1.8. The polarizing plate of claim 9, wherein the first thickness is not equal to the second thickness.