KR20120008287A - Retarder for image display device and method of fabricating the same - Google Patents

Abstract

PURPOSE: A retarder for an image display device and a manufacturing method thereof are provided to prevent defects due to shaking of a base film in irradiating polarized UV light. CONSTITUTION: An alignment film(112) is formed on a base film(110). The alignment film includes first and second domains. A liquid crystal film is formed on the alignment film. An adhesion layer(114) is formed on the lower part of the base film. A protective film(116) is formed on the lower part of the adhesion layer. A masking pattern(118) is formed on the top or the bottom of the protective film.

Description

Retarder for video display device and manufacturing method thereof {RETARDER FOR IMAGE DISPLAY DEVICE AND METHOD OF FABRICATING THE SAME}

The present invention relates to a retarder for an image display device, and more particularly, to a film patterned retarder for a 3D stereoscopic image display device and a manufacturing method thereof.

In addition to binocular disparity caused by the distance between the two eyes, there are psychological and memory factors that cause humans to feel depth and three-dimensional feeling. Therefore, how much three-dimensional image information can provide the viewer with three-dimensional image display technology? On the basis of the standard, it is classified into a volumetric expression type (volumetric type), a three-dimensional expression method (holographic type), a stereoscopic expression method (stereoscopic type).

The volume expression method is a way to feel the perspective of the depth direction due to psychological factors and inhalation effects. The viewing angle is calculated by a 3D computer graphic or an observer who displays perspective, superposition, shadow, contrast, and movement by calculation. It is applied to so-called IMAX movies, which provide a large large screen and cause optical illusions to be sucked into the space.

The three-dimensional representation method is the most complete stereoscopic image display technology, and may be represented by laser light reproduction holography or white light reproduction holography.

In addition, the stereoscopic expression method is to sense a three-dimensional feeling using physiological factors of both eyes. Specifically, if a plane-related image of parallax information is provided in the left and right, which is about 65 mm apart, the front and rear of the display surface in the process of fusing them It is the ability to create spatial information of the three-dimensional sense, that is, using stereography (stereography).

This stereoscopic expression method is called a multi-eye display method, and according to the position of the actual three-dimensional display, the viewer wears special glasses or a parallax barrier, lenticular or integral on the display surface side. It can be divided into a glasses-free method using a lens array of the back.

Of these, the glasses have a wider viewing angle and less dizziness when viewed, and can be produced at a relatively low cost, especially at a lower cost than holograms. When viewing 2D flat images, one image display device can be used for displaying 2D flat images and 3D stereoscopic images because glasses need not be worn.

The glasses can be divided into shutter glasses, which are time-crossing methods, and polarization, which are time-division methods. Shutter glasses, which display images of left and right eyes alternately on a single screen, can be used to display left and right shutters of shutter glasses. The sequential opening / closing timing is matched with the time-interval time of the left and right eye images so that each image is separately recognized by the left eye and the right eye.

In addition, the polarization splitting method divides pixels of one screen into columns, rows, or pixels, and displays left and right images in different polarization directions, and the left and right glasses of the polarizing glasses have different polarization directions. Each image is recognized separately in the left eye and the right eye, thereby displaying a three-dimensional effect.

The shutter glasses need to increase the number of times per unit time in order to reduce fatigue and increase stereoscopic feeling.When this method is applied to a liquid crystal display, the slow response speed of the liquid crystal and the screen addressing of the scan method are applied. Flicker may occur due to the timing timing's inconsistent timing with time-crossing timing, which can cause fatigue such as dizziness when listening.

Since the polarization splitting method does not cause the flicker phenomenon as described above, it causes less fatigue during viewing, but has a problem that the resolution is reduced in half because two rows, columns, or pixels are divided to display two images simultaneously on one screen.

However, since most of the current display devices such as liquid crystal display devices have already achieved high resolution and it is possible to further improve the resolution in the future, the resolution half will not be a problem in the polarization split type 3D stereoscopic display device. It is expected.

In addition, the shutter glasses method should be equipped with hardware or circuitry in the display for displaying the time difference, and the expensive glasses are required when viewing by multiple people due to the need for expensive glasses called shutter glasses. Patterned polarization optical media (e.g., patterned retarders, micro polarizers, etc.) capable of splitting polarization on the front of the device can be used for many low cost polarized glasses. The cost is relatively very low as it can be appreciated.

The patterned retarder used as the polarization split optical medium functions as optical means for modulating the emitted light so as to be disposed in front of the display device to have two different polarization directions on a pixel, row or column basis.

For example, if the phase retardation of the patterned retarder is set to quarter wave (/ 4), the polarization direction of the linearly polarized light, which is the light emitted by the liquid crystal display, is +45 degrees and -45 degrees, respectively. The outgoing light is modulated into left circular polarization and right circular polarization, respectively, and when viewed with polarized glasses having a left circular polarizing plate and a right circular polarizing plate, the left and right eyes are divided into three-dimensional images to feel a three-dimensional feeling, and thus a three-dimensional feeling such as depth and protrusion. Will feel.

In the production of patterned retarders, a pattern alignment method is formed by coating reactive mesogens (RM) on a substrate, orienting the patterns to have different optical axes, and then optically crosslinking them into liquid crystal polymer films. This is used.

Here, the substrate on which the reactive liquid crystal monomer is coated may be a glass or film substrate.

The glass substrate has strong mechanical properties, excellent surface flatness, high transparency, uniform optical characteristics without birefringence, and can form an alignment film or a reactive liquid crystal monomer with a uniform thickness by a general spin coating method. Although there is an advantage, in addition to the disadvantage of being expensive, there is a problem that the possibility of breakage during manufacturing and the process time (tact time) is long, so that the yield and mass productivity are poor.

In order to compensate for the disadvantages of the glass substrate, a film patterned retarder (FPR) using a film substrate has been developed, which will be described with reference to the accompanying drawings.

1A and 1B illustrate a conventional method for manufacturing a film patterned retarder.

As shown in FIG. 1A, after the alignment layer 12 is formed on the base film 10, the first polarized UV is irradiated onto the alignment layer 12 to form the entire region of the alignment layer 12. Orient as optically as possible.

As shown in FIG. 1B, the photomask 20 is disposed on the alignment film 12, and the second polarized UV is irradiated onto the alignment film 12 through the photomask 20.

The photo mask 20 includes a transmissive portion 20a and a blocking portion 20b, and the region of the alignment layer 12 corresponding to the transmissive portion 20a becomes the second domain 12b by the second polarization UV.

Accordingly, the alignment layer 12 is photo-aligned to have the first and second domains 12a and 12b, and then the reactive liquid crystal monomer is coated on the alignment layer 12 to complete the film patterned retarder.

In FIGS. 1A and 1B, a film patterned retarder is manufactured using one photo mask, but two photo masks may be used.

2A and 2B illustrate another method of manufacturing a conventional film patterned retarder.

As shown in FIG. 2A, after the alignment film 12 is formed on the base film 10, the first polarization UV is irradiated onto the alignment film 12 through the first photo mask 22.

The first photo mask 22 includes a transmissive portion 22a and a blocking portion 22b, and the region of the alignment layer 12 corresponding to the transmissive portion 22a becomes the first domain 12a by the first polarized UV. In addition, the region of the alignment layer 12 corresponding to the remaining blocking portion 22b does not become optical alignment and remains in its original state.

As shown in FIG. 2B, the second photo mask 24 is disposed on the alignment film 12, and the second polarized UV is irradiated onto the alignment film 12 through the second photo mask 24.

The second photo mask 24 also includes a transmissive portion 24a and a blocking portion 24b. The transmissive portion 24a and the blocking portion 24b of the second photo mask 24 are transmissive portions of the first photo mask 22. 22a and cut-off part 22b are opposed to each other.

That is, the region of the alignment layer 12 corresponding to the blocking portion 22b of the first photo mask 22 and the transmissive portion 24a of the second photo mask 24 is the second domain 12b by the second polarization UV. Becomes

Accordingly, the alignment layer 12 is photo-aligned to have the first and second domains 12a and 12b, and then the reactive liquid crystal monomer is coated on the alignment layer 12 to complete the film patterned retarder.

Such a film patterned retarder manufacturing apparatus will be described with reference to the drawings.

3 is a view showing a conventional film patterned retarder manufacturing apparatus.

As shown in FIG. 3, the retarder manufacturing apparatus 30 includes first and second rollers 32 and 34, and an alignment layer 12 is disposed on one surface of the first and second rollers 32 and 34. The formed base film 10 is wound, and the transmissive portion 20a is spaced apart from the alignment film 12 of the base film 10 unfolded between the first and second rollers 32 and 34 by a predetermined distance d. ) And a blocking mask 20b are disposed.

That is, while the base film 10 wound around the first roller 32 is unfolded and conveyed to the second roller 34, the alignment film of the base film 10 unfolded between the first and second rollers 32 and 34. Polarization UV is irradiated onto the photomask 20 through the photomask 20 to photoalignment, and as a result, domains are formed in the alignment film 12.

By the way, while the base film 10 is conveyed from the first roller 32 to the second roller 34, the base film 10 can swing up, down, left, and right by its flexibility.

That is, while the base film 10 is conveyed in the x-axis direction, the base film 10 may swing in the y-axis direction or the z-axis direction perpendicular to the x-axis, and the fluctuation of the base film 10 is an alignment film. It acts as a factor that the domain of (12) is not formed uniformly.

In addition, since the photo mask 20 and the base film 10 must be aligned, the retarder manufacturing apparatus 30 should include expensive alignment means.

FIG. 4A illustrates a domain defect of a conventional film patterned retarder due to vibration in the y axis direction, and FIG. 4B illustrates a domain defect of a conventional film patterned retarder due to vibration in the y axis direction. One drawing.

As shown in FIG. 4A, when the base film 10 swings in the y-axis direction while conveying the base film 10 having the alignment film 12 formed thereon in the x-axis direction, domains formed by polarized UV irradiation are formed in a row. Without forming a zigzag pattern.

That is, unlike the first and second domains 12a and 12b having a linear pattern shape formed when there is no fluctuation in the y-axis direction of the base film 10, the zigzag is caused by the fluctuation in the y-axis direction of the base film 10. Non-uniform patterned first and second domains 12a 'and 12b' are formed.

Therefore, even when the base film 10 is cut in a subsequent step, it is difficult to secure the alignment film 12 having the uniform first and second domains 12a and 12b, thereby increasing the manufacturing cost and lowering the productivity.

On the other hand, as shown in FIG. 4B, when the base film 10 fluctuates in the z-axis direction while conveying the base film 10 in which the alignment film 12 was formed in the x-axis direction, the width of the domain due to polarized UV irradiation. This is formed nonuniformly.

That is, when there is no fluctuation in the z-axis direction of the base film 10, the photomask 20 and the alignment layer 12 are spaced apart by a first predetermined distance d1, and the second domain is irradiated with polarized UV radiation. 12b has a first width w1 designed in advance, while when the z-axis fluctuation of the base film 10 occurs, the photomask 20 is smaller than the first separation distance d1 from the alignment layer 12. The second domain 12b ′ is disposed to be spaced apart by a large second separation distance d2, and as a result, the second domain 12b ′ by the polarized UV irradiation has a second width w2 larger than the first width w1.

Of course, the photomask 20 and the alignment layer 12 may be spaced apart by a distance smaller than the first separation distance d1 due to the swing in the z-axis direction of the base film 10, in which case the second domain ( The width of 12b) may be reduced.

Therefore, even if the base film 10 is cut in a subsequent step, it is difficult to secure the alignment film 12 having the first and second domains 12a and 12b of uniform width, thereby increasing the manufacturing cost and lowering the productivity.

The present invention provides a retarder for a video display device and a method of manufacturing the same, by forming a masking pattern on the protective film attached to the base film, thereby preventing defects caused by fluctuation of the base film during polarized UV irradiation, and improving manufacturing cost and productivity. The purpose is to provide.

The present invention also provides a retarder for a video display device and a method of manufacturing the same, by forming an alignment layer and a masking pattern on both sides of the base film so that the alignment layer and the masking pattern are automatically aligned. There is another purpose to provide.

In order to achieve the above object, the present invention, the base film; An alignment layer formed on the base film and including first and second domains; A liquid crystal film formed on the alignment layer; An adhesive layer formed under the base film; A protective film formed under the adhesive layer; Provided is a retarder for an image display device including a masking pattern formed on an upper surface or a lower surface of the protective film.

Here, the base film may include an organic polymer material, the alignment layer may include a photosensitive polymer material, and the liquid crystal film may include a photocured reactive liquid crystal monomer.

The first and second domains may be regions oriented in different directions, and the liquid crystal film may be arranged to have different optical axes for respective regions corresponding to the first and second domains.

In addition, the masking pattern has a form in which the blocking portion and the opening are alternately arranged alternately, and the first and second domains may correspond to the blocking portion and the opening, respectively.

On the other hand, the present invention comprises the steps of forming an alignment film on the base film; Forming an adhesive layer under the base film; Forming a protective film including a masking pattern under the adhesive layer; Irradiating a first polarization UV on the alignment layer from the lower portion of the protective film through the masking pattern to form a first domain on the alignment layer; Irradiating a second polarization UV on the alignment layer from above the alignment layer to form a second domain on the alignment layer; It provides a method of manufacturing a retarder for a video display device comprising the step of forming a liquid crystal film on the alignment layer.

Here, the forming of the protective film including the masking pattern under the adhesive layer may include forming the masking pattern on one surface of the protective film; And attaching the other surface of the protective film opposite to the one surface to the adhesive layer.

The forming of the protective film including the masking pattern under the adhesive layer may include forming the masking pattern on one surface of the protective film; And attaching the one surface to the adhesive layer.

In addition, the energy density of the first polarized UV may be greater than the energy density of the second polarized UV.

The forming of the liquid crystal film on the alignment layer may include coating a reactive liquid crystal monomer on the alignment layer; And photocuring the coated reactive liquid crystal monomer.

In the retarder for a video display device and a method of manufacturing the same according to the present invention, by forming a masking pattern on the protective film attached to the base film, to prevent defects caused by the fluctuation of the base film during polarized UV irradiation, and to reduce the manufacturing cost Productivity can be improved.

In addition, by forming an alignment layer and a masking pattern on both sides of the base film to be aligned so that the alignment layer and the masking pattern is automatically aligned, the investment cost for the manufacturing apparatus can be reduced.

1A and 1B illustrate a method of manufacturing a conventional film patterned retarder.
2A and 2B show another method of manufacturing a conventional film patterned retarder.
Figure 3 is a view showing a conventional film patterned retarder manufacturing apparatus.
4A is a view showing domain defects of a conventional film patterned retarder due to vibration in the y-axis direction.
4B is a view showing a domain failure of a conventional film patterned retarder due to vibration in the z-axis direction.
5A to 5D illustrate a method of manufacturing a retarder for a video display device according to a first embodiment of the present invention.
6A to 6D illustrate a method of manufacturing a retarder for a video display device according to a second embodiment of the present invention.
FIG. 7 illustrates an image display device including a retarder according to a first embodiment of the present invention. FIG.

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

5A to 5D illustrate a method of manufacturing a retarder for a video display device according to a first embodiment of the present invention.

As shown in FIG. 5A, the alignment layer 112 is formed on the base film 110, and the adhesive layer 114 and the protective film 116 are sequentially formed on the base film 110.

The base film 110 may be made of an organic polymer material such as triacetyl cellulose (TAC), cyclo olefin copolymer (COP), polyacrylate (Pac), polyetheretherketon (PEEK), polyvinylalcohol (PVA), and the like. It is made of a polymer material and can be photo-oriented by ultraviolet light.

At this time, a masking pattern 118 is formed below the protective film 116. The masking pattern 118 is formed on one surface of the protective film 116 by printing or the like, and the one surface on which the masking pattern 118 is formed is formed. By attaching the opposite surface to the adhesive layer 114, the protective film 116 and the masking pattern 118 may be formed.

The masking pattern 118 may have a shape corresponding to a domain having different polarization directions, for example, may have a stripe shape in which rod-like parallel blocking portions and openings are alternately arranged alternately, or a rectangular shape. The blocking portion and the opening may be in the form of a matrix alternately arranged.

As shown in FIG. 5B, the alignment layer 112 is selectively photo-aligned by irradiating the first polarized UV having the first energy density under the protective film 116 on which the masking pattern 118 is formed.

That is, by irradiating the first polarization UV to the alignment layer 112 through the masking pattern 118, the domain is not formed in the region of the alignment layer 112 corresponding to the masking pattern 118, and the original state is maintained, and the masking pattern ( The first domain 112a is formed in the region of the alignment layer 112 corresponding to the opening between the layers 118.

In this case, the alignment layer 112 is attached to the upper surface of the base film 110, and the masking pattern 118 is attached to the lower surface of the base film 110 through the protective film 116 and the adhesive layer 114. Even when the base film 110 swings up, down, left, and right during the used conveyance, the relative distance between the masking pattern 118 and the alignment film 112 is kept constant.

That is, the alignment layer 112 and the masking pattern 118 are uniformly spaced apart by a distance d corresponding to the thickness of the base film 110, the thickness of the adhesive layer 114, and the thickness of the protective film 116.

Therefore, even if the base film 110 swings up and down during conveyance, the separation distance d between the alignment film 112 and the masking pattern 118 is kept constant, so that the first domain 112a is formed to have a uniform width.

In addition, even if the base film 110 swings from side to side during conveyance, the alignment layer 112 and the masking pattern 118 oscillate integrally, so that a non-uniform pattern such as a zigzag pattern is prevented in forming the first domain 112a. .

As illustrated in FIG. 5C, the alignment layer 112 is selectively photo-aligned by irradiating the second polarization UV having the second energy density on the alignment layer 112 in front.

That is, by irradiating the second polarization UV on the entire surface of the alignment layer 112, the second domain 112b is formed in the region where the first domain 112a is not formed and remains in its original state.

In this case, since the second energy density of the second polarized UV is smaller than the first energy density of the first polarized UV, the first domain 112a formed by the first polarized UV is not affected by the second polarized UV and is not affected by the second polarized UV. It maintains the state of the first domain (112a).

Accordingly, the first and second domains 112a and 112b are formed in the alignment layer 112 by the light alignment of the first and second polarization UVs.

As shown in FIG. 5D, the liquid crystal film 120 is formed by coating reactive mesogens (RM) on the alignment layer 112 on which the first and second domains 112a and 112b are formed. By photocuring the liquid crystal film 120 using this, a film patterned retarder (FPR) is completed.

The liquid crystal film 120 is arranged in accordance with the alignment direction of the alignment layer 112. The liquid crystal film 120 is arranged to have different optical axes by the first and second domains 112a and 112b, and is then cured by UV irradiation.

The incident polarization is modulated to polarized light in different states while passing through regions having different optical axes of the liquid crystal film 120, that is, regions corresponding to the first and second domains 112a and 112b.

For example, when light in a linearly polarized state is incident on the liquid crystal film 120, the light is modulated into a left circular polarization (LCP) state while passing through the liquid crystal film 120 corresponding to the first domain 112a. The light may be modulated into a right circular polarization (RCP) state while passing through the liquid crystal film 120 corresponding to the second domain 112b.

As described above, in the method of manufacturing the retarder for an image display device according to the first embodiment of the present invention, the masking pattern 118 is formed on the protective film 116 formed under the base film 110 and the masking pattern ( The first domain 112a is formed by back-irradiating the alignment layer 112 through the 118, and the second domain 112b is formed by front-irradiating the alignment layer 112 on the alignment layer 112, thereby masking the pattern 118. ) And the alignment layer 112 may be unnecessary, and expensive alignment means may be omitted in the retarder manufacturing apparatus (not shown), and as a result, the investment cost for the manufacturing apparatus may be reduced.

In the method for manufacturing a retarder for a video display device according to the first embodiment of the present invention, the front side irradiation is performed after the backside irradiation through the masking pattern 118 with respect to the alignment layer 112. After the masking pattern 118 through the back irradiation may be carried out.

On the other hand, the masking pattern may be formed on the upper portion of the protective film, it will be described with reference to the drawings.

6A to 6D illustrate a method of manufacturing a retarder for a video display device according to a second embodiment of the present invention.

As shown in FIG. 6A, the alignment layer 212 is formed on the base film 210, and the adhesive layer 214 and the protective film 216 are sequentially formed on the base film 210.

The base film 210 may be made of an organic polymer material such as triacetyl cellulose (TAC), cyclo olefin copolymer (COP), polyacrylate (Pac), polyetheretherketon (PEEK), polyvinylalcohol (PVA), and the like. It is made of a polymer material and can be photo-oriented by ultraviolet light.

In this case, a masking pattern 218 is formed on the protective film 216, and a masking pattern 218 is formed on one surface of the protective film 216 by printing or the like, and one surface on which the masking pattern 218 is formed is formed. By attaching to the adhesive layer 214, the protective film 216 and the masking pattern 218 may be formed. As a result, the adhesive layer 214 and the masking pattern () may be formed between the base film 210 and the protective film 216. 218 is formed.

In FIG. 6A, although the adhesive layer 214 and the masking pattern 218 are formed to have the same thickness, they are alternately disposed between the base film 210 and the protective film 216, in another embodiment, the masking pattern 218 is illustrated. The adhesive layer 214 may be formed to have a thickness smaller than that of the adhesive layer 214 so that the adhesive layer 214 contacts the base film 210 while covering the masking pattern 218.

The masking pattern 218 may have a shape corresponding to a domain having different polarization directions, for example, may have a stripe shape in which rod-shaped parallel blocking portions and openings are alternately arranged alternately, or a rectangular shape. The blocking portion and the opening may be in the form of a matrix alternately arranged.

As shown in FIG. 6B, the alignment layer 212 is selectively photo-aligned by irradiating the first polarized UV having the first energy density under the protective film 216 on which the masking pattern 218 is formed.

That is, by irradiating the first polarization UV to the alignment layer 212 through the masking pattern 218, the domain is not formed in the region of the alignment layer 212 corresponding to the masking pattern 218, and the original state is maintained, and the masking pattern ( The first domain 212a is formed in the region of the alignment layer 212 corresponding to the opening between the 218.

In this case, the alignment layer 212 is attached to the upper surface of the base film 210, and the masking pattern 218 is formed to attach to the lower surface of the base film 210 through the protective film 216 and the adhesive layer 214. Even if the base film 210 swings up, down, left, or right during the conveyance, the relative distance between the masking pattern 218 and the alignment film 212 is kept constant.

That is, the alignment layer 212 and the masking pattern 218 are uniformly spaced apart by the distance d corresponding to the thickness of the base film 210.

Therefore, even when the base film 210 swings up and down during transportation, the separation distance d between the alignment film 212 and the masking pattern 218 is kept constant, so that the first domain 212a is formed to have a uniform width.

In addition, even if the base film 210 swings from side to side during conveyance, the alignment film 212 and the masking pattern 218 swing together integrally, so that a non-uniform pattern such as a zigzag pattern is prevented in forming the first domain 212a. .

As shown in FIG. 6C, the alignment layer 212 is selectively photo-aligned by irradiating the second polarization UV having the second energy density on the alignment layer 212 in front.

That is, the second polarized UV is irradiated on the entire surface of the alignment layer 212 to form the second domain 212b in the region where the first domain 212a is not formed and remains in its original state.

At this time, since the second energy density of the second polarized UV is smaller than the first energy density of the first polarized UV, the first domain 212a formed by the first polarized UV is not affected by the second polarized UV and is not affected by the second polarized UV. It maintains the state of the first domain (212a).

Accordingly, the first and second domains 212a and 212b are formed in the alignment layer 212 by the optical alignment of the first and second polarization UVs.

As shown in FIG. 6D, the liquid crystal film 220 is formed by coating reactive mesogens (RM) on the alignment layer 212 on which the first and second domains 212a and 212b are formed. By photocuring the liquid crystal film 220 using this, a film patterned retarder (FPR) is completed.

The liquid crystal film 220 is arranged in accordance with the alignment direction of the alignment film 212, and is arranged to have different optical axes by the first and second domains 212a and 212b, and then cured by UV irradiation.

The incident polarization is modulated to polarized light in different states while passing through regions having different optical axes of the liquid crystal film 220, that is, regions corresponding to the first and second domains 212a and 212b.

For example, when light in a linearly polarized state is incident on the liquid crystal film 220, the light is modulated into a left circular polarization (LCP) state while passing through the liquid crystal film 220 corresponding to the first domain 212a. The light may be modulated into a right circular polarization (RCP) state while passing through the liquid crystal film 220 corresponding to the second domain 212b.

As described above, in the method of manufacturing the retarder for an image display device according to the second embodiment of the present invention, the masking pattern 218 is formed on the protective film 216 formed under the base film 210 and the masking pattern ( The first domain 212a is formed by back-irradiating the alignment film 212 through the 218, and the second domain 212b is formed by front-irradiating the alignment film 212 above the alignment film 212, thereby the masking pattern 218. ) And the alignment layer 212 is unnecessary, and the expensive alignment means can be omitted in the retarder manufacturing apparatus (not shown), and as a result, the investment cost for the manufacturing apparatus can be reduced.

In the method of manufacturing a retarder for a video display device according to a second embodiment of the present invention, the front side irradiation is performed after the backside irradiation through the masking pattern 218 on the alignment layer 212. After the masking pattern 218 may be irradiated back.

The retarder according to the embodiment of the present invention is used by removing the protective film and attached to the image display device, which will be described with reference to the drawings.

FIG. 7 is a diagram illustrating an image display apparatus including a retarder according to a first embodiment of the present invention, and describes a liquid crystal display apparatus as an example of a flat image providing apparatus.

As shown in FIG. 7, the image display device includes a liquid crystal display device 350 for providing a planar image and a retarder 150 attached to one surface of the liquid crystal display device 350.

The liquid crystal display 350 may include a liquid crystal layer 330, a first substrate, and a second substrate between the first and second substrates 310 and 320 and the first and second substrates 310 and 320 facing each other. The first and second polarizing plates 312 and 322 formed on the outer surface of each of the first and second polarizing plates 310 and 320 may include a backlight unit 340 under the first polarizing plate 312.

The retarder 150 may include an adhesive layer 114 formed on the second polarizing plate 322, a base film 110 formed on the adhesive layer 114, and an alignment layer 112 formed on the base film 110. The liquid crystal film 120 is formed on the alignment layer 112, and the protective film 116 on which the masking pattern 118 is formed is removed from the film patterned retarder (FPR) completed through FIGS. 5A through 5D. The retarder 150 is attached to the liquid crystal display device 350 by attaching the base film 110 on which the alignment layer 112 and the liquid crystal film 120 are formed using the adhesive layer 114 to the upper portion of the second polarizing plate 322. Can be attached to

The alignment layer 112 may include first and second domains 112a and 112b oriented in different directions, and the liquid crystal film 120 may be different from each other according to the alignment directions of the first and second domains 112a and 112b. It is arranged to have an optical axis in the direction.

Although not shown, an inner surface of the first substrate 310 of the liquid crystal display device 350 is connected to a thin film transistor and a thin film transistor connected to the gate wiring and the data wiring, the gate wiring and the data wiring to define a pixel area. A pixel electrode disposed in the pixel area may be formed, and a color filter layer and a common electrode may be formed on an inner surface of the second substrate 320 of the liquid crystal display device 350.

Light supplied from the backlight unit 340 passes through the first polarizing plate 312, the liquid crystal layer 330, and the second polarizing plate 322, and enters the retarder 150 in a linearly polarized state.

The light in the linearly polarized state is modulated into a left circularly polarized light (LCP) state while passing through the liquid crystal film 120 corresponding to the first domain 112a, and passes through the liquid crystal film 120 corresponding to the second domain 112b. It is modulated into a right circularly polarized light (RCP) and emitted.

Therefore, the light emitted from the image display device arrives at the viewer having a left circular polarization (LCP) state or a right circular polarization (RCP) state for each region, and the planar image of the different regions in the left and right areas is transmitted by the viewer's polarized glasses. The viewer recognizes the 3D stereoscopic image by synthesizing the planar image of the left and right eyes.

In FIG. 7, the liquid crystal display device 350 is taken as an example of a planar image providing device. In another embodiment, various types of display devices for emitting light in a polarized state may be applied.

In addition, in FIG. 7, the retarder 150 modulates the light in the linearly polarized state into the left circularly polarized light or the right circularly polarized state for each region, but in another embodiment, the retarder outputs the light in the linearly polarized state into the different linearly polarized states by region. It can also be modulated.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

110, 210: base film 112, 212: alignment film
114 and 214: adhesive layers 116 and 216: protective film
118, 218: masking pattern 120, 220: liquid crystal film

Claims (9)

A base film;
An alignment layer formed on the base film and including first and second domains;
A liquid crystal film formed on the alignment layer;
An adhesive layer formed under the base film;
A protective film formed under the adhesive layer;
Masking pattern formed on the upper or lower surface of the protective film
Retarder for video display device comprising a.
The method of claim 1,
And the base film includes an organic polymer material, the alignment layer includes a photosensitive polymer material, and the liquid crystal film includes a photocured reactive liquid crystal monomer.
The method of claim 1,
And the first and second domains are regions oriented in different directions, and the liquid crystal film is arranged to have different optical axes for respective regions corresponding to the first and second domains.
The method of claim 1,
The masking pattern has a form in which the blocking portion and the opening are alternately arranged alternately, wherein the first and second domains respectively correspond to the blocking portion and the opening.
Forming an alignment layer on the base film;
Forming an adhesive layer under the base film;
Forming a protective film including a masking pattern under the adhesive layer;
Irradiating a first polarization UV on the alignment layer from the lower portion of the protective film through the masking pattern to form a first domain on the alignment layer;
Irradiating a second polarization UV on the alignment layer from above the alignment layer to form a second domain on the alignment layer;
Forming a liquid crystal film on the alignment layer
Method of manufacturing a retarder for a video display device comprising a.
The method of claim 5, wherein
Forming the protective film including the masking pattern under the adhesive layer,
Forming the masking pattern on one surface of the protective film;
Attaching the other surface of the protective film opposite to the one surface to the adhesive layer;
Method of manufacturing a retarder for a video display device comprising a.
The method of claim 5, wherein
Forming the protective film including the masking pattern under the adhesive layer,
Forming the masking pattern on one surface of the protective film;
Attaching the one surface to the adhesive layer
Method of manufacturing a retarder for a video display device comprising a.
The method of claim 5, wherein
The energy density of the first polarized UV is greater than the energy density of the second polarized UV manufacturing method for the image display device.
The method of claim 5, wherein
Forming the liquid crystal film on the alignment layer,
Coating a reactive liquid crystal monomer on the alignment layer;
Photocuring the coated reactive liquid crystal monomer
Method of manufacturing a retarder for a video display device comprising a.

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