WO2013023359A1 - Film-type integrated 3d stereoscopic display polaroid and preparing method thereof - Google Patents

Abstract

A film-type integrated 3D stereoscopic display polaroid and a preparing method thereof. The 3D stereoscopic display polaroid includes a peeling film layer (1), an internal protection film layer (2), a polyvinyl alcohol film layer (3), a microbit phase difference film layer (4), an external protection film layer (5) bonded together successively, wherein an even number of rows of slow axes of the microbit phase difference film is arranged with 0° to 50° or 130° to 180° to the transmission light axis of the polyvinyl alcohol film layer, and an odd number of rows of slow axes of the microbit phase difference film are arranged with 130° to 180° or 0° to 50° to the transmission light axis of the polyvinyl alcohol film layer. The microbit phase difference film is anti-glare (AG), anti-reflection (AR/LR) or anti-scratch (HC) processed. The 3D stereoscopic display polaroid can convert the linear polarized light emitted from a liquid crystal panel into two groups of independent and crossing left and right circular polarized light so as to form a left and right image. The audience only need to wear a pair of simple and cheap circular polarized light glasses to view pure-coloured 3D display images without flicker. Moreover, the 3D stereoscopic display polaroid has the advantages of thin thickness and high optical penetration rate.

Description

 Thin integrated 3D stereo display polarizer and preparation method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizer for a TFT type liquid crystal display, and more particularly to a 3D stereoscopic display polarizer having a thin thickness and a high light transmittance. The present invention also relates to a method of preparing the polarizer.

BACKGROUND OF THE INVENTION Currently, polarizers on the market can only produce a polarization characteristic, and can not directly display a stereoscopic display effect on a general TFT liquid crystal display. Chinese Patent Application No. 201110021048.7 discloses a 3D polarizer, which includes a sequential bonding. The release film, the original polarizer and the stereoscopic display film together have a stereoscopic display film mainly as a micro phase difference film, and the polarizer has a thick thickness and a low optical transmittance. The disclosed preparation method comprises 3 steps. Step 1: attaching a roll of the original polarizer bonded with two peeling films to the first unwinding device in a relatively rotatable manner, and mounting the rolled stereoscopic display film in a relatively rotatable manner to the second retreat On the roll device. Step 2: peeling off the peeling film of the initial stage adhered to the outer surface of the original polarizer, and connecting the initial section of the peeled peeling film to the rotating shaft of the first winding device, and then the stereoscopic display film The initial segment is bonded to the stripping film of the original polarizer through the adhesive on the outer surface of the original polarizer to form a 3D stereoscopic polarizer, and the inner and outer surfaces are respectively adhered with a release film and a three-dimensional The 3D stereoscopic display polarizer of the display film is coupled to the rotating shaft of the second winding device via at least one pair of bonding rollers. The production efficiency of this process is low, and the above products are thick, high in cost, and low in optical transmittance.

SUMMARY OF THE INVENTION In order to solve the problems in the prior art, the present invention provides a thin integrated 3D stereoscopic display polarizer, which has a thin thickness and high optical transmittance without affecting the use, and can produce better. The 3D effect of the invention; the invention also provides a preparation method of the polarizer, which effectively reduces the production cost and improves the production efficiency.

 The technical scheme of the present invention is: a thin integrated 3D stereoscopic display polarizer, comprising a peeling film layer, an inner protective film layer, a polyvinyl alcohol film layer, a micro phase difference film layer, and an outer protection layer which are sequentially bonded together. a film layer, a composite of the micro-phase phase difference film, the inner protective film and the polyvinyl alcohol film adopts a water-soluble series adhesive, wherein the slow axis of the even-numbered rows of the differential phase film and the transmission optical axis of the polyvinyl alcohol film layer are 0°~50° or 130°~180°, the slow axis of the odd-numbered rows of the micro-phase phase difference film and the transmission optical axis of the polyvinyl alcohol film layer are arranged at 130°~180° or 0°~50°, the micro The phase difference film is treated with anti-glare AG or anti-reflection AR/LR or anti-scratch HC.

Preferably, the anti-glare treatment micro-phase phase difference film has an AG value of 3% to 50% or the anti-reflection treatment micro-phase phase difference film has an AR/LR value of ≤1.0% or the anti-scratch treatment. The micro-phase phase difference film is subjected to anti-glare treatment, anti-reflection treatment or HC coating for the differential phase difference film (FPR). The anti-glare treatment method is: sandblasting the film surface to form a rough surface, or coating a film-based adhesive on the film surface, in which inorganic or organic transparent particles are dispersed. Anti-reflection The treatment mainly utilizes the principle of optical interference, and may be a method of laminating a hard coat layer and a low refractive index layer composed of a metal oxide or the like on the surface of the film layer or forming a low refractive index layer such as an inorganic compound or an organic fluoride in a single layer. Reflective film. The method of HC coating is: coating silicone on the surface of the film to enhance the surface hardness and wear resistance of the material.

 Preferably, the microphase retardation film is one of a cycloolefin polymer film, a polycarbonate film, and a cellulose triacetate film.

 Preferably, the in-plane phase difference of the micro-phase phase difference film is 80 nm to 150 nm, which is a 1/4 λ wave plate.

 Preferably, the microphase retardation film is a cycloolefin polymer film having a thickness of 30 μηη! ~ 200μηι.

 Preferably, the inner protective film is one selected from the group consisting of a cellulose triacetate film, a cycloolefin polymer film, a polynorbornene film, a polycarbonate film, a polystyrene film, and an acrylic film.

 Preferably, the polarizer has a transmittance of ≥ 42% and a crosstalk value of ≤ 1.0%.

 The invention provides a preparation method of the above thin integrated 3D stereoscopic display polarizer, which comprises the following steps:

 Step h The packaged polyvinyl alcohol film, the micro phase difference film, and the inner protective film are respectively mounted on the first, second, and third unwinding devices, and the slow axis direction of the micro phase difference film is adjusted.

 Step 2: The polyvinyl alcohol film is unwound, and after being dyed, stretched, complemented, dried, etc., it is combined with the inner protective film and the micro-phase film, and after compound drying, the film is wound up.

Step 3: The one side of the semi-finished micro-phase retardation film is laminated with a protective film, and the release film is laminated on the inner protective film side to form a final product. The entire composite process is carried out by a precision positioning laminator equipped with sophisticated edge ultrasonic detectors, infrared detectors, center correction controllers, edge correction controllers, tension controllers and CCD cameras to ensure the fit angle. The accuracy.

 The beneficial effects of the present invention are: the thin integrated 3D stereoscopic display polarizer of the present invention converts the linearly polarized light emitted by the TFT liquid crystal display into two sets of independent left and right circular polarized lights, and the people wear the light and inexpensive circular polarized glasses. The 3D image can be seen. The micro-phase phase difference film of the polarizer of the present invention also replaces the inner protective film on the PVA film side of the conventional polarizer, and integrates the phase difference compensation function and the protection function, and the product thickness is thin (thickness) Reduced by 80~150 m), lower cost, higher production efficiency and higher transmission rate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of a thin integrated 3D stereoscopic display polarizer of the present invention.

 2 is a schematic view showing the composite of a polyvinyl alcohol film, an inner protective film and a micro phase difference film of the present invention.

Figure ₃ is a schematic view showing the function of the differential phase difference film in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be further described with reference to the accompanying drawings.

As shown in FIG. 1, the thin integrated 3D stereoscopic display polarizer of the present invention comprises a release film 1, an inner protective film 2, a polyvinyl alcohol film 3 (PVA), and a micro phase difference film 4 (FPR) which are sequentially bonded together. The outer protective film 5; wherein, the slow axis of the even-numbered rows of the differential phase film 4 (the direction in which the light propagation speed is faster is the fast axis, and the direction perpendicular thereto is the slow axis). Transmission with the polyvinyl alcohol film 3 The optical axis is 0°~50° Or 130° to 180°, the slow axis of the odd-numbered rows of the micro-phase retardation film 4 and the transmission optical axis of the polyvinyl alcohol film 3 are 130° to 180° or 0° to 50°.

 As shown in Fig. 3, the microphase retardation film can convert the emitted linearly polarized light into two independent and intersecting left and right circular polarized lights, and the left and right circular polarized light enters the human eye through the circular polarized glasses to form a left and right image, which is synthesized through the brain. 3D stereo image.

 The micro-phase retardation film (FPR) is surface-coated and has anti-glare AG (Anti Glare) or anti-reflective AR/LR (Anti Reflective/ Low Reflective) or anti-scratch HC (Hard Coating) function. In the present invention, an anti-glare AG layer is preferred, wherein the anti-glare AG value is preferably from 3% to 50%.

The polyvinyl alcohol film 3 (PVA film) adsorbs a dichroic substance such as iodine or a dichroic dye, and then further crosslinks, stretches, and dries. The polyvinyl alcohol film is washed with water, so that not only the dirt on the surface of the film and the anti-adhesive agent can be removed, but also the polyvinyl alcohol film can be expanded to prevent the occurrence of uneven dyeing. After the polyvinyl alcohol film 3 is stretched, dyed, and dried, the inner protective film 2 and the micro-phase film 4 (FPR) are respectively laminated on both sides thereof. The inner protective film needs to have transparency, mechanical strength, thermal stability, and moisture. More preferable properties such as barrier properties and isotropy are preferably cellulose resins such as cellulose triacetate, polynorbornene, polycarbonates, cycloolefin polymers, polystyrenes, and acrylics. It is a cellulose triacetate film (TAC film) which has been subjected to saponification treatment, or a cycloolefin polymer film (COP film) after corona treatment, and an inner protective film and a micro phase difference film (FPR) are formed by using water-soluble glue and poly The vinyl alcohol film (PVA) is bonded, preferably by a polyvinyl alcohol glue. In addition, depending on the application, an internal protective film with phase compensation or UV absorption can be selected. Among them, the phase compensation function can be realized by film stretching and coating liquid crystal. After the film is stretched, it has a certain phase compensation function due to its birefringence property. Micro-phase phase difference film selection in the invention The phase compensation function is realized by coating a liquid crystal compound on a transparent substrate. The UV protection function of the film is mainly achieved by adding an ultraviolet absorber at the time of film formation.

 The in-plane phase difference value Re of the micro-phase phase difference film 4 is preferably 80 nm to 150 nm, and particularly preferably a quarter-wave plate (the generated wave plate having a phase retardation amount of (2m+l) π /2, m=0, 1, 2, 3...), Re=125 nm, where Re is the in-plane phase difference of the film in the visible range, Re=(nx-ny) xd, nx and ny represent the film in the slow axis direction and the fast axis direction, respectively The refractive index, d, represents the thickness of the film.

 The transparent substrate of the differential phase film 4 (FPR) may be an optical film such as a polycarbonate film (PC), a cycloolefin polymer (COP) film or a cellulose triacetate film (TAC). In the present invention, the selection of the differential phase difference film (FPR) requires better optical transparency, lower reflectance, better mechanical strength, stronger stability under moist heat conditions, moisture barrier properties, etc. Therefore, in the present embodiment, a cycloolefin polymer (COP) film having a thickness of 30 μη is preferable! ~ 200μηι.

 The bonding of the inner protective film 2 and the release film 1 can be usually carried out by using a conventionally known adhesive or adhesive such as an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyether or the like. The adhesive is preferably an acrylic adhesive from the viewpoints of optical transparency, adhesive properties, weather resistance and the like.

As shown in FIG. 2, the method for bonding the polyvinyl alcohol film (PVA) to the inner protective film and the micro phase difference film (FPR) may be as follows: First, the packaged polyvinyl alcohol film 3 (PVA), The differential phase difference film 4 (FPR) and the inner protective film 2 are respectively mounted on the first unwinding device 6, the second unwinding device 7, and the third unwinding device 8, and are adjusted (the direction of the absorption axis through the polarizer and the micro The phase adjustment of the slow axis of the phase difference film) is the slow axis direction of the differential phase difference film (FPR). Next, the polyvinyl alcohol film (PVA) is unwound, and after being dyed, stretched, complemented, dried, and the like, it is compounded with an inner protective film or a differential phase film (FPR). After the composite drying, the winding device 9 is wound up into a semi-finished product. Finally, the protective film is composited on the side of the semi-finished micro-phase retardation film, and the inner protective film is laminated on the side to form the final product.

 The entire composite process is carried out by a precision positioning laminator equipped with sophisticated edge ultrasonic detectors, infrared detectors, center correction controllers, edge correction controllers, tension controllers and CCD cameras to ensure the fit angle. The accuracy.

 Evaluation method:

 The 3D stereoscopic display polarizer A of the present invention can be tested and analyzed using the instrument CS-200, and the crosstalk and optical transmittance (T) of the 3D stereoscopic display are used as evaluation indexes, and the 3D stereoscopic display polarizer of the present invention is preferably used. To make the crosstalk value less than or equal to 1.0%.

Example 1:

 Raw materials: Protective film, surface AG coated COP micro-phase retardation film, PVA film, internal protection TAC film, release film

 Adhesive: PVA glue, pressure sensitive adhesive.

 The COP micro-phase retardation film and the inner protective TAC film were composited on both sides of the dye-stretched PVA film with PVA glue, and the release film was combined with the pressure-sensitive adhesive to protect the other side of the TAC film, and finally the difference in the micro-position A protective film is laminated on one side of the film.

Example 2:

Raw materials: protective film, surface PC coated PC micro-phase phase difference film, PVA film, internal protection TAC film, release film Adhesive: PVA glue, pressure sensitive adhesive

 The specific operation is the same as in Embodiment 1.

Example 3:

 Raw materials: protective film, surface AG coated TAC micro phase retardation film, PVA film, internal protection TAC film, release film

 Adhesive: PVA glue, pressure sensitive adhesive

 The specific operation is the same as in Embodiment 1.

Example 4:

 Raw materials: Protective film, surface AG coated COP micro-phase retardation film, PVA film, internal protection COP film, release film

 Adhesive: PVA glue, pressure sensitive adhesive

 The specific operation is the same as in Embodiment 1.

Example 5

 Raw materials: protective film, surface AG coated PC micro-phase phase difference film, PVA film, internal protection COP film, release film

 Adhesive: PVA glue, pressure sensitive adhesive

The specific operation is the same as in the first embodiment. Example 6

 Raw materials: Protective film, surface AG coated TAC micro phase retardation film, PVA film, internal protection COP film, release film

 Adhesive: PVA glue, pressure sensitive adhesive

 The specific operation is the same as in Embodiment 1.

 Comparative Example 7: (Prior polarizer in the prior art)

 Raw materials: Protective film, surface AG coated COP micro-phase retardation film, PVA film, internal protection TAC film, release film

 Adhesive: PVA glue, pressure sensitive adhesive

 A layer of inner protective film (TAC) is laminated on both sides of the dyed and stretched PVA film with PVA glue, followed by a pressure sensitive adhesive on one side of the inner protective film on the microphase retardation film (COP), in the opposite A composite release film is formed on the protective film on one side, and finally a protective film is laminated on one side of the differential phase film.

The polarizer prepared in each example was tested with a spectrophotometer CS-200, and the results are shown in the following table: Example Transmittance τ (%) Crosstalk value (%) Example 1 43.73 0.52 Example 2 43.11 0.96 Example 3 43.34 0.75 Example 4 43.62 0.58 Example 5 43.23 0.92 Example 6 43.28 0.77 Comparative Example 7 42.67 1.22 The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. That is, equivalent changes and modifications made by the content of the patent application scope of the present invention should fall within the technical protection scope of the present invention.

Claims

Claim  1. A thin integrated 3D stereoscopic display polarizer, comprising: a release film layer, an inner protective film layer, a polyvinyl alcohol film layer, a micro phase difference film layer, and an outer protective film which are sequentially bonded together; a layer, the composite between the micro-phase retardation film, the inner protective film and the polyvinyl alcohol film adopts a water-soluble series adhesive, wherein the slow axis of the even-numbered rows of the differential phase film and the transmission optical axis of the polyvinyl alcohol film layer are 0. °~50° or 130°~180°, the slow axis of the odd-numbered rows of the micro-phase retardation film and the transmission optical axis of the polyvinyl alcohol film layer are arranged at 130° to 180° or 0° to 50°.  The polarizer according to claim 1, wherein: the micro-phase phase difference film is subjected to anti-glare AG treatment by: sandblasting the film surface of the micro phase difference film to form a rough surface, the anti-glare The treated micro-phase retardation film has an AG value of 3% to 50%.  The polarizer according to claim 1, wherein: said micro-phase retardation film is subjected to anti-reflection AR/LR treatment by laminating a metal oxide on a surface of said micro-phase retardation film The hard coat layer and the antireflection film of the low refractive index layer in which the inorganic compound or the organic fluoride is formed in a single layer, and the inversion antireflection treatment has a 1:1 value of ≤ 1.0%.  The polarizer according to claim 1, wherein: the micro-phase retardation film is subjected to anti-scratch HC treatment by: coating a film on the film surface of the micro-phase retardation film, the anti-defense The HC value of the micro-phase difference film of the scratch treatment was ≥211.  The polarizer according to any one of claims 1 to 4, wherein the differential phase difference film is one of a cycloolefin polymer film, a polycarbonate film, and a cellulose triacetate film.  The polarizer according to claim 5, wherein the in-plane phase difference of the micro-phase retardation film is from 80 nm to 150 nm, which is a 1/4 lambda plate. The polarizer according to claim 5, wherein the microphase retardation film is a cycloolefin polymer film having a thickness of 30 μm! ~ 200μηι. The polarizer according to claim 1, wherein the inner protective film is selected from the group consisting of a cellulose triacetate film, a cycloolefin polymer film, a polynorbornene film, a polycarbonate film, and a polystyrene film. One of the acrylic films.  The polarizer according to claim 1, wherein the polarizer has a light transmittance of >42% and a crosstalk value of ≤1.0%.  10. A method of fabricating a thin integrated 3D stereoscopic display polarizer according to claim 1, comprising: the following steps:  Step 1: The packaged polyvinyl alcohol film, the micro phase difference film, and the inner protective film are respectively mounted on the first, second, and third unwinding devices, and the slow axis direction of the micro phase difference film is adjusted.  Step 2: The polyvinyl alcohol film is unwound, and after being dyed, stretched, complemented, dried, etc., it is combined with the inner protective film and the micro-phase film, and after compound drying, the film is wound up.  Step 3: The one side of the semi-finished micro-difference film is laminated with a protective film, and the inner protective film is laminated on the side to form a final product.