KR20090101630A - Polarizing film for 3 dimensional liquid crystal display - Google Patents

Abstract

PURPOSE: A stereoscopic liquid crystal display thin film having improved high hardness and low reflection is provided to reduce the deterioration of the screen by the deterioration of visibility by the reflective of the external light. CONSTITUTION: A stereoscopic image liquid crystal display thin film having improved high hardness and low reflection includes an upper plate(11) and a lower plate(12). The thin film includes polarizer protection films, a phase difference film and low-reflection layer. The polarizer protection film is stuck it protects the polarized light device at a single-side of the polarized light device or the polarized light device laminated on the upper side of a substrate at least. The phase difference film is laminated on the upper side of the polarizer protection film. The hard coating layer is laminated on the upper side of the phase difference film.

Description

POLARIZING FILM FOR 3 DIMENSIONAL LIQUID CRYSTAL DISPLAY}

The present invention relates to a polarizing film for a stereoscopic image liquid crystal display device, and more particularly, to a polarizing film used in a polarizing glasses type stereoscopic liquid crystal display device, a polarization film having improved readability to external light and surface strength of the liquid crystal display device. It is about.

In general, three-dimensional images are based on the principle of stereo vision through two eyes of a person, and binocular parallax, which appears because the eyes are spaced about 65 mm apart, may be the most important factor of the stereoscopic sense. Recently, there is a great demand for a stereoscopic image display device that provides a stereoscopic image using the principle of binocular disparity in various fields such as medical imaging, games, advertising, education, and military. In addition, as high-definition TV becomes more and more popular, it is expected that in the future, popularization of a stereoscopic TV capable of watching TV in three dimensions will be possible.

The principles of the three-dimensional image display device developed to date include polarized glasses and non-glasses type. In particular, three-dimensional image display using a liquid crystal display (LCD) which is most commonly used as an image display device in recent years. The research of the device is active. Among these, in order to manufacture a liquid crystal display device suitable for polarizing glasses, the left eye image and the right eye image are distinguished on the upper polarizing film of the liquid crystal display device to polarize linearly polarized light that has passed through the retardation film or the upper polarizing film with circular polarization. It is common to use retardation film.

In general, in order to realize this, a retardation film (λ / 2 film or λ / 4 film, λ film, etc.) is laminated and attached on top of the upper polarizing film in the liquid crystal display device. However, in the conventional structure, when the retardation film is laminated on top of the upper polarizing film, the hardness characteristic and low surface reflection (<0.5%) of 3H or more, which is obtained by the hard coating layer formed on the existing polarizing film before lamination, There is a disadvantage that the characteristics deteriorate.

1 is a cross-sectional view showing a structure of a polarizing film for a polarizing glasses type liquid crystal display device generally used.

As shown in FIG. 1, the liquid crystal display device 100 is attached to each of the upper substrate 111 and the lower substrate 112, the upper substrate 111, and the lower substrate 112 filled with the liquid crystal 113 therebetween. The upper polarizing film 120 and the lower polarizing film 130, and the upper polarizing film 120 starts from an upper surface of the upper substrate 111, the first polarizer protective film 121, and the polarizer 122. , The second polarizer protective film 123, the hard coating layer 124, the low reflection layer 125, and the retardation film 126 are stacked in this order.

According to the polarizing film having such a structure, a polarizing film applied to a polarizing glasses liquid crystal display device has a suitable structure, but it is insufficient to obtain low reflection properties and high hardness characteristics. Therefore, in the laminated structure of the conventional polarizing film, it will be said that a laminated structure of a polarizing film having high hardness and low reflection characteristics is additionally required while maintaining suitable characteristics as a polarizing film for a polarizing glasses type liquid crystal display device.

The present invention is to solve the above problems, an object of the present invention is to retain the characteristics of the polarizing film applied to the polarizing glasses type liquid crystal display device, while improving the high hardness and low reflection characteristics that were a problem in the conventional polarizing film It is to provide a polarizing film for a stereoscopic image liquid crystal display device having a.

The present invention is to solve the above problems, the polarizing film for a liquid crystal display device according to the first embodiment of the present invention, in the polarizing film for three-dimensional image liquid crystal display device made to implement a stereoscopic image by polarizing glasses, A polarizer protective film attached to at least one of an upper substrate and a lower substrate of the liquid crystal display, and adhered to protect the polarizer on at least one surface of the polarizer and the polarizer stacked on an upper surface of the substrate; A phase difference film laminated on an upper surface of the polarizer protective film; A hard coating layer laminated on an upper surface of the retardation film; It comprises a low reflection layer laminated on the upper surface of the hard coating layer.

According to the polarizing film having the above structure, the outermost layer of the polarizing film is provided with a hard coating layer and a low reflection layer, thereby improving surface hardness characteristics and low reflection characteristics and obtaining a polarizing film suitable for a polarizing glasses stereoscopic display device. There are advantages to it.

In addition, the polarizing film for a liquid crystal display device according to the second embodiment of the present invention, in the polarizing film for a three-dimensional image liquid crystal display device configured to implement a stereoscopic image by polarizing glasses, the upper substrate or the lower substrate of the liquid crystal display device A polarizer protective film attached to at least one of the polarizers and bonded to protect the polarizers on at least one surface of the polarizers stacked on the upper surface of the substrate; A phase difference film laminated on an upper surface of the polarizer protective film; A low reflection layer laminated on an upper surface of the retardation film; It comprises a hard coating layer laminated on the upper surface of the low reflection layer.

According to the polarizing film having the above structure, the outermost layer of the polarizing film is provided with a hard coating layer and a low reflection layer, and the hard coating layer is laminated on the top to obtain a polarizing film which emphasizes surface hardness characteristics more than the polarizing film of the first embodiment. Can be.

In addition, the polarizing film for a liquid crystal display device according to a third embodiment of the present invention, in the polarizing film for a three-dimensional image liquid crystal display device configured to implement a stereoscopic image by polarizing glasses, the upper substrate or the lower substrate of the liquid crystal display device A first polarizer protective film attached to at least one of the substrates, the polarizer stacked on an upper surface of the substrate, and the first polarizer protective film adhered to the lower surface of the polarizer to protect the polarizer; A phase difference film laminated on an upper surface of the polarizer; A second polarizer protective film laminated on an upper surface of the retardation film; A hard coating layer laminated on an upper surface of the second polarizer protective film; It comprises a low reflection layer laminated on the upper surface of the hard coating layer.

According to the polarizing film having the above structure, by placing the retardation film under the polarizer protective film, it can provide a polarizing film that can protect the retardation film that plays an important role in the polarizing film for stereoscopic images from external impact.

According to the present invention, when the polarizing film for a stereoscopic image liquid crystal display device using the conventional polarized glasses is applied, the surface of the liquid crystal display device is weak and easily broken, or the degradation of the screen quality due to the deterioration of visibility caused by the reflection of external light. By solving the problem, there is an advantage to manufacture a brighter, clearer, and more durable polarized glasses stereoscopic liquid crystal display device.

1 is a cross-sectional view showing the structure of a polarizing film for a conventional polarizing glasses liquid crystal display device

2 is an exploded perspective view of a polarizing film for a stereoscopic image liquid crystal display device according to a first embodiment of the present invention;

3 is a cross-sectional view of a polarizing film for a stereoscopic image liquid crystal display device according to a second embodiment of the present invention.

4 is a cross-sectional view of a polarizing film for a stereoscopic image liquid crystal display device according to a third embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: liquid crystal display device 11: upper substrate

12: lower substrate 20: upper polarizing film

30: lower polarizing film 21, 23, 32: polarizer protective film

22, 31: polarizer 24: retardation film

25: hard coating layer 26: low reflection layer

50: polarized glasses

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

2 is an exploded perspective view of a polarizing film for a stereoscopic image liquid crystal display device according to a first embodiment of the present invention.

As shown in FIG. 2, the liquid crystal display device 10 includes an upper substrate 11 and a lower substrate 12 filled with a liquid crystal 13 therebetween, and the upper substrate 11 and the lower substrate ( An upper polarizing film 20 and a lower polarizing film 30 are attached to the upper surface of 12), respectively. As the lower polarizing film 30, a polarizer 31 is interposed between the polarizer protective film 32 which is a structure of a polarizing film generally used. In addition, a polarizing glasses 50 are separately provided for a user to watch a 3D stereoscopic image through the image implemented by the liquid crystal display device 10.

Here, the polarizing film for a stereoscopic image liquid crystal display device according to the first embodiment of the present invention is applied as the upper polarizing film 20, the upper polarizing film 20 from the surface of the upper substrate 11, the first The polarizer protective film 21, the polarizer 22, the second polarizer protective film 23, the retardation film 24, the hard coating layer 25, and the low reflection layer 26 are stacked in this order.

On the other hand, it is common to use an adhesive to attach the upper polarizing film 20 and the lower polarizing film 30 to the upper substrate 11 and the lower substrate 12, respectively.

The polarizers 22 and 31 are generally manufactured by dyeing and stretching polyvinyl alcohol (PVA) resin films by adsorption of dichroic dyes and orienting the dichroic dyes. In the present invention, the polarization axes of the upper polarizer 22 attached to the upper substrate 11 and the lower polarizer 31 attached to the lower substrate 12 are configured to form a 90 ° angle with each other. Alternatively, the upper polarizer 22 and the lower polarizer 31 have a patterned shape divided into left and right eyes, respectively, and the polarization axes of the corresponding upper polarizer 22 and the lower polarizer 31 respectively have a 90 ° angle to each other. Can be configured to achieve

The first polarizer protective film 21 and the second polarizer protective film 23, 32 are made of a transparent resin film, in particular a cellulose acetate film represented by triacetyl cellulose (TAC), one surface of the polarizer 22 Or on both sides.

The retardation film 24 is arranged in a mosaic form to change the polarization direction of the linearly polarized light passing through the upper polarizer 22 for each of the left eye image and the right eye image, or the linearly passed through the left eye image and the right eye image. It may have a general configuration in the form of converting the polarized light into circular polarized light, in the present invention, λ / 4 film or 3 λ / 4 film or left and right eyes having an optical axis that is ± 45 ° difference with respect to the polarization axis of the polarizer 22 A lambda / 2 film and a film without retardation or a retardation film to which a lambda film is applied, respectively, or a combination of two or more films are used.

Among them, the λ / 4 film or 3λ / 4 film performs a role of changing the linearly polarized light by retarding the linearly polarized light by λ / 4 or 3λ / 4.

The hard coat layer 25 is formed by curing the light transmissive resin, and after the light transmissive resin forms the hard coat layer 25, the hard coat layer 25 corresponds to a sufficient strength as a film, preferably pencil hardness of 2H or more, more preferably 3H or more. Form.

The hard coating layer 25 is composed of a binder resin having sufficient strength after curing and having light transmittance as a main component, and an ultraviolet photoinitiator, a leveling agent, a thixotropic agent, a dispersing agent (organic solvent), and an antistatic agent for effective polymerization thereto. It may be made by including an additive such as a curing agent. Examples of the binder resin include thermosetting resins, thermoplastic resins, ultraviolet curable resins, electron beam curable resins, two-component mixed resins, and the like. Among these, ultraviolet curable resins that form an effective hard coating layer by a simple processing operation by curing treatment by ultraviolet irradiation. Is preferred.

The binder resin used in the composition of the hard coating layer 25 is not particularly limited, but is a resin which crosslinks by crosslinking polymerization by irradiation with ultraviolet rays and changes into a polymer structure, and a polymerizable unsaturated bond or an epoxy group in a molecule thereof. It is preferable to mix | blend suitably the ultraviolet curable resin, photoinitiator, etc. which mixed the reactive monomer which has, oligomer, a prepolymer, etc. individually or in mixture.

The low reflection layer 26 is applied to prevent reflection of external light, and is applied for diffuse reflection and anti-glare effects by the action of the irregularities on the surface.

As an example of such a low reflection layer 26, the type which forms an uneven | corrugated shape on the surface of an anti-glare layer by aggregation of particle | grains, such as aggregated silica, organic fine particles or inorganic fine particles which have a particle diameter more than the film thickness in a coating film are added to resin, Any form may be applied, such as a type of forming an uneven shape on the surface of the layer, or a type of lamination using a roll having unevenness on the surface of the layer and transferring of the uneven shape.

In addition, the hard coating layer 25 and the low reflection layer 26 is applied integrally, the hard coating layer formed by dispersing organic or inorganic fine particles in the binder resin used in the composition of the hard coating layer 25, and curing the binder resin. -It can also be comprised as a low reflection layer integrated film.

The low reflection layer 26, which is preferably used in the present invention, may be configured as a multilayer structure of a four-layer stack as a different material, or may have lowered surface reflectivity by varying the refractive index while having characteristics corresponding thereto.

As the polarizing film having the above-described laminated structure is applied to the low reflection layer 26 and the hard coating layer 25 as the outermost layer, the low reflection characteristics and the surface hardness reinforcement characteristics are ensured, respectively, and polarized glasses type stereoscopic liquid crystal display There is an advantage applicable to the device.

3 is a cross-sectional view of a polarizing film for a stereoscopic image liquid crystal display device according to a second embodiment of the present invention.

The polarizing film for a stereoscopic image liquid crystal display device according to the second embodiment of the present invention is mainly used as the upper polarizing film 20 as in the first embodiment.

As shown in FIG. 3, the stacking order of the upper polarizing film 20 according to the second embodiment of the present invention is based on the first polarizer protective film 21, the polarizer 22, and the surface of the upper substrate 11. Second polarizer protective film 23, retardation film 24, low reflection layer 26, hard coating layer 25 in that order.

Comparing the stacking structure of the second embodiment with that of the first embodiment, it is found that the stacking order of the other components is the same, and that the order of the low reflection layer 26 and the hard coating layer 25 used as the outermost layer is reversed. Can be.

Therefore, the laminated structure of the polarizing film according to the second embodiment of the present invention will be said to be common in terms of securing low reflection characteristics and surface hardness reinforcing characteristics, similar to the laminated structure of the polarizing film according to the first embodiment. However, in the case of the first embodiment, the low reflection characteristics are considered a little more, and in the second embodiment, the surface hardness reinforcing characteristics will be emphasized.

4 is a cross-sectional view of a polarizing film for a stereoscopic image liquid crystal display device according to a third embodiment of the present invention.

The polarizing film for a stereoscopic image liquid crystal display device according to the third embodiment of the present invention is mainly used as the upper polarizing film 20, as in the first and second embodiments described above.

As shown in FIG. 4, the stacking order of the polarizing film for a stereoscopic image liquid crystal display according to the third embodiment of the present invention is from the surface of the upper substrate 11, the first polarizer protective film 21 and the polarizer 22. ), The retardation film 24, the second polarizer protective film 23, and the hard coating layer 25 low reflection layer 26.

That is, in the third embodiment of the present invention, the retardation film 24 is placed under the second polarizer protective film 23 to take a structure to protect it. Since the structure of the retardation film 24 is important in the polarizing glasses type image display device, the structure is intended to protect the retardation film 24 from damages such as external scratches.

Such a laminated structure of the third embodiment is configured to change the positions of the top hard coating layer 25 and the low reflection layer 26 so that the hard coating layer 25 is exposed to the upper portion of the polarizing film to maximize the surface hardness enhancement characteristics. Of course you can.

The shape of the light implemented by the polarizing film for the 3D image liquid crystal display device described in the first to third embodiments of the present invention is as shown in Table 1 below.

TABLE 1

As shown in Table 1, the light emitted from the light source is polarized in a straight line (↔, ⊙) while passing through the polarizers 31 and 22 of the lower polarizing film 30 and the upper polarizing film 20, respectively. When the linearly polarized light passes through the retardation film 24, when the retardation film 24 is a λ / 2 film, the linearly polarized light is emitted in the form of a linearly polarized light that separates the left eye and the right eye and reaches the polarized glasses 50. (First embodiment), when the retardation film 24 includes the lambda / 4 film, the linearly polarized light (↔, ⊙) is changed to circularly polarized light to reach the polarizing glasses 50. (2nd embodiment Form and Third Embodiment In this case, when the circularly polarized light reaches the polarizing glasses 50 (second and third embodiments), the polarizing glasses 50 are used to recognize the circularly polarized light as an image. The retardation film of (lambda) / 4 film is placed in the structure, and the circularly polarized light is converted back into linearly polarized light.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

Claims (3)

In the polarizing film for a three-dimensional image liquid crystal display device configured to implement a three-dimensional image by polarized glasses, Attached to at least one of an upper substrate and a lower substrate of the liquid crystal display device; A polarizer protective film adhered to protect the polarizer on at least one surface of the polarizer and the polarizer stacked on the upper surface of the substrate; A phase difference film laminated on an upper surface of the polarizer protective film; A hard coating layer laminated on an upper surface of the retardation film; And a low reflection layer laminated on an upper surface of the hard coating layer. In the polarizing film for a three-dimensional image liquid crystal display device configured to implement a three-dimensional image by polarized glasses, Attached to at least one of an upper substrate and a lower substrate of the liquid crystal display device; A polarizer protective film adhered to protect the polarizer on at least one surface of the polarizer and the polarizer stacked on the upper surface of the substrate; Retardation film laminated on the upper surface of the polarizer protective film; A low reflection layer laminated on an upper surface of the retardation film; And a hard coating layer laminated on an upper surface of the low reflection layer. In the polarizing film for a three-dimensional image liquid crystal display device configured to implement a three-dimensional image by polarized glasses, Attached to at least one of an upper substrate and a lower substrate of the liquid crystal display device; A polarizer stacked on an upper surface of the substrate, and a first polarizer protective film adhered to a lower surface of the polarizer to protect the polarizer; A phase difference film laminated on an upper surface of the polarizer; A second polarizer protective film laminated on an upper surface of the retardation film; A hard coating layer laminated on an upper surface of the second polarizer protective film; And a low reflection layer laminated on an upper surface of the hard coating layer.