TW201708857A - Polarizer plate and on-cell touch panel - Google Patents

Abstract

A polarizer plate is provided, including: a polarizer film; and a plurality of protective layers disposed on at least one side of the polarizer film, wherein a total thickness of the polarizer film and the protective layer is from 135 [mu]m to 250 [mu]m.

Description

Polarizer

The present invention relates to a polarizing plate, and more particularly to a polarizing plate having a plurality of protective layers.

In recent years, since touch functions are commonly used in smart handheld devices, the requirements for thin and light electronic products are also applied to touch panels. Currently, one-piece touch panels (One Glass Solution, OGS) and surface mounts are available. Solutions such as On-Cell Touch and In-Cell Touch have been introduced to reduce the overall thickness of electronic products.

An embodiment of the present invention provides a polarizing plate comprising: a polarizing film; and a plurality of protective layers disposed on at least one side of the polarizing film, wherein a total thickness of the polarizing film and the protective layer is 135 μm to 250 μm.

According to an embodiment of the invention, the polarizing plate has an overall dielectric constant of 2 to 4.

According to an embodiment of the invention, in the polarizing plate, the total thickness of the protective layer is from 110 μm to 200 μm.

According to an embodiment of the invention, the polarizing plate further comprises: a hard The coating layer is disposed on a surface of one of the protective layers, and the hard coating layer has a thickness of 10 μm to 55 μm.

10‧‧‧In-cell touch panel

10'‧‧‧In-cell touch panel

12‧‧‧Touch substrate

14‧‧‧Line layer

16‧‧‧Polar plate

18‧‧‧Protection cover

30‧‧‧Polar plate

161‧‧‧ polarizing film

163‧‧‧Protective film

301‧‧‧ polarizing film

303a‧‧‧Protective layer

303‧‧‧ first protective layer

305‧‧‧Second protective layer

307‧‧‧ third protective layer

309‧‧‧hard coating

311‧‧‧First pressure sensitive adhesive layer

313‧‧‧Second pressure layer

D‧‧‧The overall thickness of the polarizing plate

1A to 1B are schematic cross-sectional views showing a surface-mounted touch panel; FIG. 1C is a cross-sectional view showing a polarizing plate of a surface-mounted touch panel; and FIG. 2 is a view showing a polarizing plate according to some embodiments of the present invention. 3 is a schematic cross-sectional view of a polarizing plate according to a first embodiment of the present invention; FIG. 4 is a cross-sectional view showing a polarizing plate according to a second embodiment of the present invention; In the third embodiment, a schematic cross-sectional view of the polarizing plate is shown; and FIG. 6 is a cross-sectional view showing the polarizing plate in the fourth embodiment of the present invention.

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, in which the drawings are not drawn to scale. In fact, the size of the elements may be arbitrarily enlarged or reduced so as to clearly express the features of the present invention. In the description and the drawings, the same or similar elements will be denoted by like symbols.

The various features of the invention are set forth in the description of the various embodiments of the invention. Of course, these are only examples and should not limit the scope of the invention. For example, when the first element is referred to in the description to form a second element, it may include an embodiment in which the first element is in direct contact with the second element, and may include other elements formed in the first An embodiment between the second elements, wherein the first element is not in direct contact with the second element. In addition, repeated reference numerals or signs may be used in the various embodiments, which are merely for the purpose of simplicity and clarity of the disclosure, and do not represent a particular relationship between the various embodiments and/or structures discussed.

In addition, space-related terms such as "under", "below", "above", "between", and similar terms may be used. These relational terms are used to facilitate the description of the relationship between one element or feature(s) in the drawing and another element or feature(s), which are intended to include different orientations of the device in operation or operation, and The orientation described in the illustration. The device may be turned to a different orientation (rotated 90 degrees or other orientation), and the spatially related adjectives used therein may also be interpreted identically. It should be understood that additional operational steps may be performed before, during, or after the method is performed, and that some of the operational steps may be replaced or deleted in the methods of other embodiments.

1A and 1B are schematic cross-sectional views showing the in-cell touch panel 10, respectively. As shown in FIG. 1A, the in-cell touch panel 10 generally includes touch The substrate 12, the wiring layer 14, the polarizing plate 16, and a cover lens 18 are controlled. The protective cover 18 is disposed on the polarizing plate 16 as an operation interface of the touch panel 10 and provides surface protection to prevent the touch panel from being damaged by external force. In an embodiment, the circuit layer 14 may be a transparent oxidized conductive layer, such as an indium tin oxide (ITO) layer. In an embodiment, the protective cover 18 may be a glass layer.

In recent years, in order to reduce the cost, the protective cover is removed, and the polarizing plate of the touch panel is exposed to the environment. However, the existing polarizing plates do not have the same mechanical properties as the protective cover, such as scratch resistance, hardness, and the like. In addition, the removal of the protective cover may reduce the overall thickness of the touch panel, thereby affecting the sensitivity of the touch module. In addition, the polarizing plate having insufficient thickness also causes the wiring layer 14 of the touch circuit to be easily affected by moisture or external force to corrode.

The present invention has been made in order to solve the above problems. As shown in Fig. 1B, a portion of the in-cell touch panel 10' can omit the protective cover 18, thereby exposing the polarizing plate 16 to the environment. FIG. 1C further shows the detailed structure of the polarizing plate 16. In one embodiment, as shown in FIG. 1C, the polarizing plate 16 used in the in-cell touch panel 10' may not have a compensation film, and the polarizing plate 16 includes a polarizing film 161 and a protective film formed on both sides of the polarizing film 161. 163, for example, triacetyl cellulose (TAC). The overall thickness of the polarizing plate 16 is about 130 to 140 um.

However, the polarizing plate 16 does not have the same mechanical properties as the protective cover, such as scratch resistance, hardness, and the like. In addition, the removal of the outer protective cover may reduce the overall thickness of the in-cell touch panel 10', thereby affecting the touch. The sensitivity of the module's actuation.

In order to solve the above problems, the present invention provides a polarizing plate having a plurality of protective layers such that the overall thickness of the polarizing plate is increased, for example, between 135 and 250 μm, thereby improving the touch function of the in-cell touch panel. Furthermore, the polarizing plate of the present invention can also improve the hardness and scratch resistance of the surface of the polarizing plate by treating the surface of the polarizing plate. In one embodiment, the polarizing plate of the present invention has a hardness of up to 6H. In an embodiment, the surface treatment roughness of the polarizing plate of the present invention can be less than 50 nm, so that the actuation sensitivity of the touch module can be achieved, and the friction caused by the stylus on the surface of the optical component during operation can be reduced. damage.

The polarizing plate of this case will be described in detail below. Figure 2 shows a schematic cross-sectional view of a polarizing plate 30 in accordance with some embodiments of the present invention. As shown in FIG. 2, the polarizing plate 30 includes a polarizing film 301 and a plurality of protective layers 303a, for example, two or more protective layers 303a. The protective layer 303a may be disposed on at least one side of the polarizing film 301. In an embodiment, the protective layer 303a is disposed on both sides of the polarizing film 301.

In one embodiment, the overall thickness D of the polarizing plate 30, that is, the polarizing film 301 and the plurality of protective layers 303a may have a total thickness of 135 μm to 250 μm, for example, 150 μm to 200 μm or 150 μm to 230 μm. In particular, if the overall thickness D of the polarizing plate is too thin, the circuit layer 14 may be easily corroded by moisture or external force, thereby affecting the sensitivity of the touch module. Conversely, if the overall thickness D of the polarizing plate is too thick, the touch function may be disabled.

In an embodiment, the polarizing film 301 may have a thickness of 5 μm to 40 μm, for example, 20 μm to 35 μm. In an embodiment, the protective layer 303a The total thickness may be from 110 μm to 200 μm, for example, from 130 μm to 180 μm. Furthermore, in an embodiment, the respective thicknesses of the protective layer 303a may be from 30 μm to 100 μm, for example, from 40 μm to 90 μm. It should be noted that the thickness and material of the plurality of protective layers 303a may be the same or different from each other as long as the total thickness is from 110 μm to 200 μm.

Furthermore, the overall dielectric constant of the polarizing plate 30, that is, the polarizing film 301 and the plurality of protective layers 303a may have an overall dielectric constant of 2 to 4. The overall capacitance of the polarizing plate 30 is between 9*10^-8 and 8*10^-10 Farads.

As described above, the polarizing film 301 is a main polarizing substrate of the polarizing plate, and converts light from non-polarizing light to polarized light. The polarizing film 301 may be formed by adsorbing a polyvinyl alcohol (PVA) film of an aligning dichroic dye or by absorbing an absorbing dye molecule from the liquid crystal material. Polyvinyl alcohol can be formed by saponifying polyvinyl acetate. In some embodiments, the polyvinyl acetate may be a monomer of vinyl acetate or a copolymer of vinyl acetate and other monomers, and the like. The above other monomers may be unsaturated carboxylic acids, olefins, unsaturated sulfonic acids or vinyl ethers. In other embodiments, the polyvinyl alcohol may be a modified polyvinyl alcohol, for example, an aldehyde-modified polyethylene formaldehyde, polyvinyl acetal or polyvinyl butyral or the like.

The method of forming the above polarizing film 301 is not particularly limited, and it can be produced by any suitable conventional method. In general, the method for forming the polarizing film 301 may include: swelling treatment, dyeing treatment, cross-linking treatment, washing treatment, etc., and performing stretching treatment of the film in the crosslinking treatment or the crosslinking treatment, and finally the film. Drying is carried out.

Furthermore, the plurality of protective layers 303a can protect the optical properties of the polarizing film 301 and prevent the polarizing film 301 from being retracted and also provide protection for the outermost layer of the polarizing plate 30. The material of the protective layer 303a may be a polyester resin, an olefin resin, a cellulose acetate resin, a polycarbonate resin, an acrylic resin, a cycloolefin resin, or a combination thereof, but is not limited thereto.

In some embodiments, the material of the protective layer 303a may be triacetyl cellulose (TAC), diacetyl cellulose (DAC), polyethylene terephthalate (PET), Cycloolefin polymer (COP), poly(methyl methacrylate), cyclic olefin copolymer (COC), polycarbonate resin, polyether oxime, polyarylene Amine, polyfluorene, polyethylene resin, polyvinyl chloride resin, cellulose diacetate, or a combination thereof, but is not limited thereto.

Further, the protective layer 303a may contain an ultraviolet absorber (for example, a diphenylketone compound or a benzotriazole compound) or a plasticizer (for example, a phenyl phosphate compound or a phthalate compound, etc.) ).

Further, the protective layer may be further subjected to surface treatment such as anti-glare treatment, anti-reflection treatment, hard coating treatment, electrification prevention treatment or anti-fouling treatment. The above surface treatment can have a thickness of more than 10 μm, a hardness of up to 6H, and high scratch resistance, high antifouling property, and low moisture permeability, so that the protective cover can be replaced.

In some embodiments, the polarizing plate 30 may include a hard coat layer (not shown) disposed on the surface of the protective layer 303a. The hard coat layer can greatly improve the hardness and scratch resistance of the surface of the polarizing plate 30. In one embodiment, the thickness of the hard coat layer It may be from 10 μm to 55 μm, for example, from 15 μm to 50 μm. The material of the hard coat layer may be an acrylic resin, a urethane resin, a melamine resin, an organic phthalate compound, a polyoxyxylene resin, a metal oxide or a combination thereof, but is not limited thereto.

The protective layer 303a and the method of forming the hard coat layer are not particularly limited, and may be produced by any suitable conventional method. For example, evaporation, sputtering, coating or directly bonding to the polarizing film by a suitable bonding agent.

In addition, the polarizing plate 30 may also include one or more layers of a pressure sensitive adhesive (PSA) layer (not shown) disposed on the surface of the protective layer 303a. The pressure sensitive adhesive layer can be used to provide a bonding between the protective layer 303a and the polarizing film 301 and a bonding between the plurality of protective layers 303a, and can also be used to provide a bonding between the polarizing plate 30 and the touch substrate. The pressure sensitive adhesive layer refers to an adhesive which adheres to the surface of the object under light pressure and is prepared by mixing an elastomer, a tackifying resin, a plasticizer and a filler. The properties of the pressure sensitive adhesive layer vary with the monomer used, the manner in which it is polymerized, the molecular weight of the controlled colloid, or the glass transition temperature. The pressure sensitive adhesive layer may be natural rubber, Styrene Butadiene Rubber (SBR), acrylic resin (for example, acrylate copolymer) or a combination thereof, but is not limited thereto.

It is worth noting that, due to the structure of the in-cell touch panel, the circuit layer 14 is directly in contact with the pressure sensitive adhesive layer, in order to avoid the acid corrosion of the circuit layer 14 contained in the monomer and the oligomer in the pressure sensitive adhesive layer, and The antistatic agent contained in the pressure sensitive adhesive layer electrically interferes with the circuit layer 14. The pressure sensitive adhesive layer used in this case is preferably free of acid value and antistatic agent to avoid corrosion of the circuit layer 14 and electrical interference. In one embodiment, the pressure sensitive adhesive layer has a resistance of 10 ¹³ ohms.

In another embodiment, the pressure sensitive adhesive layer may also be doped with conductive particles, such as transparent metal oxide, nano particles, conductive polymer or conductive metal such as nickel (Ni), gold (Au) or a combination thereof. To achieve anti-static function. In one embodiment, the pressure sensitive adhesive layer has a resistance of 10 ⁷ to 10 ⁹ ohms.

Some embodiments of the present invention are described in more detail below to explain the polarizing plate of the present invention in more detail.

Fig. 3 is a cross-sectional view showing the polarizing plate 30 in the first embodiment according to the present invention. In this embodiment, the polarizing plate 30 includes a polarizing film 301 and three protective layers, which are a first protective layer 303, a second protective layer 305, and a third protective layer 307, respectively. As shown in FIG. 3, the first protective layer 303 is formed under the polarizing film 301, and the second protective layer 305 and the third protective layer 307 are formed on the polarizing film 301.

In this embodiment, the polarizing film 301 is formed, for example, of polyvinyl alcohol, the first protective layer 303 and the second protective layer 305 are formed, for example, of cellulose triacetate, and the third protective layer 307 is, for example, a cycloolefin polymer. Formed. Further, the polarizing film 301 has a thickness of 15 to 35 μm, for example, 25 μm; the first protective layer 303 has a thickness of 50 to 70 μm, for example, 60 μm; and the second protective layer 305 has a thickness of 30 to 50 μm, for example, 40 μm; The thickness of the triple protective layer 307 is 40 to 60 μm, for example, 52 μm. In an embodiment, the second protective layer 305 and the third protective layer 307 may optionally include a pressure sensitive adhesive layer (not shown).

Fig. 4 is a cross-sectional view showing the polarizing plate 30 in the second embodiment of the present invention. In this embodiment, the polarizing plate 30 also includes a polarizing film 301 and three protective layers, which are respectively a first protective layer 303 and a second protective layer. The cover layer 305 and the third protective layer 307. As shown in FIG. 4, the first protective layer 303 and the third protective layer 307 of this embodiment are formed under the polarizing film 301, and the second protective layer 305 is formed over the polarizing film 301.

In this embodiment, the polarizing film 301 is formed, for example, of polyvinyl alcohol, the first protective layer 303 and the second protective layer 305 are formed, for example, of cellulose triacetate, and the third protective layer 307 is, for example, polymethacrylic acid. A methyl ester (poly (methyl methacrylate) is formed. Further, the polarizing film 301 has a thickness of 15 to 35 μm, for example, 25 μm; the first protective layer 303 has a thickness of 30 to 50 μm, for example, 40 μm; and the second protective layer 305 The thickness is 30 to 50 μm, for example, 40 μm; the thickness of the third protective layer 307 is 70 to 90 μm, for example, 82 μm. In an embodiment, the first protective layer 303 and the third protective layer 307 are selectively selectable. A pressure sensitive adhesive layer (not shown) is included.

Fig. 5 is a cross-sectional view showing the polarizing plate 30 in the third embodiment of the present invention. In this embodiment, the polarizing plate 30 includes a polarizing film 301 and two protective layers (a first protective layer 303 and a second protective layer 305) and a hard coat layer 309. As shown in FIG. 5, in this embodiment, the first protective layer 303 and the second protective layer 305 are respectively formed on both sides of the polarizing film 301, and the hard coat layer 309 is formed on the second protective layer 305.

In this embodiment, the polarizing film 301 is formed, for example, of polyvinyl alcohol, the first protective layer 303 and the second protective layer 305 are formed, for example, of cellulose triacetate, and the hard coat layer 309 is formed, for example, of acrylic resin. . Further, the polarizing film 301 has a thickness of 20 to 40 μm, for example, 30 μm; the first protective layer 303 has a thickness of 50 to 70 μm, for example, 60 μm; and the second protective layer 305 has a thickness of 20 to 40 μm, for example, 30 μm; Coating 309 has a thickness of 50 to 60 μm, for example, 55 μm.

Fig. 6 is a cross-sectional view showing the polarizing plate 30 in the fourth embodiment of the present invention. In this embodiment, the polarizing plate 30 includes three protective layers (a first protective layer 303, a second protective layer 305, and a third protective layer 307), a first pressure sensitive adhesive layer 311, and a second pressure sensitive adhesive. Layer 313. As shown in FIG. 6, in this embodiment, the first protective layer 303, the second protective layer 305, and the third protective layer 307 are respectively formed on both sides of the polarizing film 301, and the first pressure sensitive layer 311 is formed on the first The second pressure sensitive layer 313 is formed between the first protective layer 303 and the second protective layer 305 under the second protective layer 305.

In this embodiment, the polarizing film 301 is formed of, for example, polyvinyl alcohol, and the first protective layer 303, the second protective layer 305, and the third protective layer 307 are formed, for example, of cellulose triacetate, and the first pressure sensitive adhesive layer 311 And the second pressure sensitive adhesive layer 313 is an adhesive which can be adhered to the surface of the object by light pressing, and is prepared by mixing an elastomer, a tackifying resin, a plasticizer and a filler. The properties of the first pressure-sensitive adhesive layer 311 and the second pressure-sensitive adhesive layer 313 vary depending on the monomer used, the manner of polymerization, the molecular weight of the controlled colloid, or the glass transition temperature. The first pressure sensitive adhesive layer 311 and the second pressure sensitive adhesive layer 313 may be natural rubber, Styrene Butadiene Rubber (SBR), acrylic resin (for example, acrylate copolymer) or a combination thereof. , but not limited to this.

In one embodiment, the first pressure sensitive adhesive layer 311 and the second pressure sensitive adhesive layer 313 may be doped with conductive particles, so that the resistance values of the first pressure sensitive adhesive layer 311 and the second pressure sensitive adhesive layer 313 are 10 ⁷ to 10 ⁹ ohms. In one embodiment, the conductive particles may include: a transparent metal oxide, a nanoparticle, a conductive polymer, or a conductive metal such as nickel (Ni), gold (Au), or a combination thereof.

Further, the polarizing film 301 has a thickness of 5 to 40 μm, for example, 25 μm; the first protective layer 303 has a thickness of 50 to 70 μm, for example, 60 μm; and the second protective layer 305 has a thickness of 50 to 100 μm, for example, 82 μm; The thickness 307 of the triple protective layer is 40 to 100 μm, for example, 45 μm; the thickness of the first pressure sensitive adhesive layer 311 and the second pressure sensitive adhesive layer 313 is 5 to 20 μm, for example, 5 μm.

In summary, the polarizing plate provided by the present invention has a plurality of protective layers, so that the overall thickness of the polarizing plate is between 135 and 250 μm, which is thicker than the polarizing plate conventionally used for the surface-mounted touch panel, and can improve the surface-embedded type. The sensitivity of the touch panel of the touch panel. Furthermore, the polarizing plate of the present invention can also improve the hardness and scratch resistance of the surface of the polarizing plate by surface treatment of the polarizing plate, thereby effectively replacing the protective cover of the outer layer of the existing surface-mounted touch panel.

The foregoing description of the various embodiments of the invention may be Those skilled in the art can readily design or modify other processes and structures based on the present invention to achieve the same objectives and/or achieve the same advantages as the embodiments of the present invention. It should be understood by those of ordinary skill in the art that the present invention is not limited to the scope of the invention.

While the invention has been described above in terms of several preferred embodiments, it is not intended to limit the scope of the present invention, and any one of ordinary skill in the art can make any changes without departing from the spirit and scope of the invention. And the retouching, so the scope of protection of the present invention is attached to the patent application The definition of the enclosure shall prevail.

30‧‧‧Polar plate

301‧‧‧ polarizing film

303a‧‧‧Protective layer

D‧‧‧The overall thickness of the polarizing plate

Claims (10)

A polarizing plate comprising: a polarizing film; and a plurality of protective layers disposed on at least one side of the polarizing film, wherein the polarizing film and the protective layers have a total thickness of 135 μm to 250 μm. The polarizing plate of claim 1, wherein the polarizing film has a thickness of 10 μm to 40 μm, and/or the total thickness of the protective layers is 110 μm to 200 μm, and/or respective thicknesses of the protective layers. It is from 30 μm to 100 μm. The polarizing plate of claim 1, wherein the protective layer comprises: triacetyl cellulose (TAC), diacetyl cellulose (DAC), polyethylene terephthalate. (polyethylene terephthalate, PET), cyclic olefin polymer (COP), cyclic olefin copolymer (COC) or a combination thereof. The polarizing plate of claim 1, further comprising: a hard coat layer disposed on a surface of the protective layer, wherein the hard coat layer has a thickness of 10 μm to 55 μm, and/or the hard coat layer The material of the layer includes: an acrylic resin, a urethane resin, a melamine resin, an organic phthalate compound, a polyoxyxylene resin, a metal oxide or a combination thereof. The polarizing plate of claim 1, further comprising: at least one pressure sensitive adhesive layer disposed on a surface of the protective layer, the pressure sensitive adhesive layer having a thickness of 10 μm to 30 μm. The polarizing plate of claim 5, wherein the pressure sensitive adhesive layer may comprise a conductive particle, and/or the pressure sensitive adhesive layer has a resistance of 10 ⁷ to 10 ⁹ ohms. The polarizing plate of claim 1, wherein the protective layers are composed of three protective layers, respectively a first protective layer, a second protective layer and a third protective layer, wherein the first protective layer The second protective layer and the third protective layer are disposed on the other side of the polarizing film. The polarizing plate of claim 7, wherein the first protective layer and the second protective layer are formed of cellulose triacetate, and the third protective layer is composed of a cyclic olefin polymer or polymethacrylic acid. Formed by methyl ester. The polarizing plate of claim 7, wherein the second protective layer is adjacent to the polarizing film, and the first protective film and the third protective film are formed of cellulose triacetate, and the second protective layer It is formed from a cyclic olefin copolymer. The polarizing plate of claim 1, wherein the protective layers are composed of two protective layers, respectively a first protective layer and a second protective layer, wherein the first protective layer and the second protection layer The layers are respectively disposed on the two sides of the polarizing film, and the polarizing plate further comprises a hard coating layer disposed on the second protective layer, wherein the hard coating layer has a thickness of 10 μm to 55 μm.