KR20110007322A - Optical filter for stereoscopic image display, method for manufacturing the same and stereoscopic image display comprising the same - Google Patents

Abstract

PURPOSE: An optical filter for a stereoscopic image display, a method for manufacturing the same, and a stereoscopic image display apparatus are provided to easily implement an alignment process by obtaining the superior dimensional stability. CONSTITUTION: An image generator(220) generates image ray for a right eye and image ray for a left eye. A first polarizing plate(240) is arranged between the image generator and light source. A second polarizing plate(260) is arranged at the light emitting face of the image generator. An optical filter(100) is arranged at the second polarizing plate. The transmission shafts of both polarizing plates are perpendicular.

Description

Optical filter for stereoscopic image display device, a method of manufacturing the same, and a stereoscopic image display device including the same {OPTICAL FILTER FOR STEREOSCOPIC IMAGE DISPLAY, METHOD FOR MANUFACTURING THE SAME AND STEREOSCOPIC IMAGE DISPLAY COMPRISING THE SAME}

The present invention relates to an optical filter for a stereoscopic image display device, a method of manufacturing the same, and a stereoscopic image display device including the same. More particularly, the stereoscopic image display device having a simple manufacturing method and excellent dimensional stability and alignment is provided. An optical filter, a manufacturing method thereof, and a stereoscopic image display device including the same.

Unlike the existing 2D planar image, the 3D stereoscopic image is a new concept image which improves the quality level of visual information by several dimensions because it is similar to the real image seen and felt by a person. In general, it is known that the cause of the three-dimensional three-dimensional feeling of the human being is because the right eye and the left eye recognize objects with parallax. That is, since two human eyes are spaced apart at about 65 mm apart, they see images in slightly different directions, and the stereoscopic sense is recognized by the binocular disparity generated at this time. Therefore, a stereoscopic image can be implemented by inputting a parallax image to both eyes of an observer.

The conventional stereoscopic image display apparatus can be divided into a method of using polarized glasses and a method of not using polarized glasses, among which a stereoscopic image display device of a polarized glasses type has a left eye image and a right eye having different polarization characteristics. The image is discharged, and a polarizing plate or the like is attached to the polarizing glasses so that only the left eye image is projected on the left eye lens, and the right eye image is projected on the right eye lens, thereby making a stereoscopic feeling. This polarizing glasses method has the disadvantage of wearing glasses, but relatively low viewing angle constraints, and has the advantage of easy manufacturing.

In the conventional stereoscopic image display apparatus of the polarizing glasses method, a left eye image display unit for generating a left eye image and a right eye image display unit for generating a right eye image are alternately arranged, and the image display unit is generated. And a polarizer for changing the polarization state of the left eye image and the right eye image.

In this case, the polarizer is manufactured by patterning the polarizing plate itself so as to correspond to the left eye image display unit and the right eye image display unit, or attaching the phase difference plate patterned to correspond to the left eye image display unit and the right eye image display unit.

On the other hand, the patterned polarizing plate or the retardation plate as described in the US Patent No. 5,327,285, a photoresist on a polarizing film laminated a TAC (Tri Acetyl Cellulose) film and a stretched PVA (Poly Vinyl Alcohol) film treated with iodine After coating and exposing a predetermined portion, it can be prepared by a method of treating with potassium hydroxide solution to lose the phase difference retardation function in a predetermined portion. However, this conventional method has to go through complicated manufacturing steps according to chemical etching, resulting in high production costs and low productivity. In addition, there is a problem that it is not easy to align the pattern of the polarizing plate or the retardation plate to exactly correspond to the pixels of the display units after patterning.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an optical filter for a stereoscopic image display device having a simple manufacturing process, easy alignment, and excellent dimensional stability, and a method of manufacturing the same.

In addition, the present invention provides a stereoscopic image display device including the optical filter.

In accordance with another aspect of the present invention, there is provided a method of forming an index pattern on one surface of a transparent substrate; Stacking the [lambda] / 4 phase delay layer and the [lambda] / 2 phase delay layer on the surface on which the index pattern of the transparent substrate is formed; And selectively removing the λ / 2 phase delay layer.

In this case, the index pattern is preferably formed at a position corresponding to a boundary between the right eye image generation area and the left eye image generation area of the stereoscopic image display device, and is preferably formed by a printing method.

Meanwhile, the step of stacking the [lambda] / 4 phase delay layer and the [lambda] / 2 phase delay layer includes: preparing a laminate of the [lambda] / 4 phase delay layer and the [lambda] / 2 phase delay layer; And attaching the laminate of the λ / 4 phase delay layer and the λ / 2 phase delay layer on the surface on which the index pattern of the transparent substrate is formed.

In this case, preparing the laminate of the λ / 4 phase delay layer and the λ / 2 phase delay layer may include forming alignment layers on both sides of the transparent substrate and applying liquid crystal on the alignment layers, respectively. In this case, the liquid crystal alignment directions of the λ / 4 phase delay layer and the λ / 2 phase delay layer are perpendicular to each other.

On the other hand, the step of preparing a laminate of the λ / 4 phase delay layer and λ / 2 phase delay layer to form an alignment layer on one surface of the transparent substrate, by applying a liquid crystal on the alignment layer to form a λ / 2 phase delay layer step; And attaching the λ / 4 retardation plate in the form of a film to the other surface of the transparent substrate.

In addition, the step of selectively removing the λ / 2 phase delay layer is preferably performed by laser etching, and during the laser etching, it is preferable to perform etching based on the index pattern. The laser is preferably a laser having a wavelength that is absorbed in the λ / 2 phase delay layer and is not absorbed in the substrate on which the λ / 2 phase delay layer is formed.

In another aspect, the present invention is an optical filter for use in a stereoscopic image display device comprising a right eye image generating region for generating the right eye image light and a left eye image generating region for generating the left eye image light, the transparent filter; An index pattern positioned on one surface of the transparent substrate and formed in an area corresponding to a boundary between a right eye image generation area and a left eye image generation area of the stereoscopic image display device; A λ / 4 phase delay layer formed on a surface on which an index pattern of the transparent substrate is formed; And a λ / 2 phase delay layer positioned on the λ / 4 phase delay layer and selectively formed in a region corresponding to one of the right eye image generation region and the left eye image generation region. To provide.

In this case, the transparent substrate is preferably a glass substrate, the height of the index pattern is preferably 1 to 20% of the line width.

In addition, the λ / 4 retardation layer may be made of a reactive liquid crystal or a polymer film subjected to stretching treatment or refractive index control treatment.

In addition, the λ / 2 phase delay layer may be formed of a reactive liquid crystal.

In another aspect, the invention provides a light source; An image generator including a right eye image generation region for generating right eye image light and a left eye image generation region for generating left eye image light;

A first polarizer disposed between the image generator and a light source; A second polarizer disposed on the light exit surface side of the image generator; And an optical filter disposed on the second polarizing plate side, wherein the optical filter comprises: a transparent substrate; An index pattern on the transparent substrate and formed in an area corresponding to a boundary between the right eye image generation area and the left eye image generation area; A λ / 4 phase delay layer formed on a surface on which an index pattern of the transparent substrate is formed; And a λ / 2 phase delay layer positioned on the λ / 4 phase delay layer and selectively formed in a region corresponding to one of the right eye generation region and the left eye image generation region.

Since the optical filter manufacturing method for a stereoscopic image display device of the present invention forms patterns using laser etching instead of photolithography, the manufacturing process is simple and the production cost is low.

In addition, the optical filter for a stereoscopic image display device of the present invention attaches a phase retardation layer on a transparent substrate having excellent flatness, thereby providing excellent dimensional stability when etching the phase retardation layer, Since the boundary of the pixel region is displayed, alignment is easy.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 shows a stereoscopic image display device of the present invention. As shown in FIG. 1, the stereoscopic image display apparatus of the present invention includes a light source 300, an image generator 220, a first polarizing plate 240, a second polarizing plate 260, and an optical filter 100. do.

The light source 300 is for supplying light to the image display unit, and is disposed at the innermost side of the stereoscopic image display apparatus when viewed from the viewer. The light source used in the present invention is not particularly limited, and various light sources used in the art may be used.

On the other hand, the image generating unit 220 is for generating image light capable of realizing a stereoscopic image, the left eye image generating area (L) for generating the left eye image light and the right eye image generating area for generating the right eye image light Has (R). These left eye image generation regions L and right eye image generation regions R are alternately arranged as shown in FIG. 1.

Two polarizing plates 240 and 260 are disposed on both sides of the image generating unit. For convenience, the polarizing plate positioned on the light source side is referred to as the first polarizing plate 240 and the polarizing plate positioned on the light exit surface side is referred to as the second polarizing plate 260. . In this case, the first polarizing plate 240 and the second polarizing plate 260 are disposed such that transmission axes are perpendicular to each other.

The light emitted from the light source 300 is converted into linearly polarized light having a specific polarization direction through the first polarizing plate 240 and then transmitted through the right eye image generating region R and the left eye image generating region L of the image generating unit. . The image generating unit 220 may be configured of, for example, an LCD cell arranged two-dimensionally in a horizontal direction or a vertical direction, and the polarization axis of light passing through each cell by electrically driving the LCD cell. Rotate 90 degrees. Accordingly, the light passing through the image generating unit 220 has a polarization axis perpendicular to the transmission axis of the first polarizing plate, and as a result, the first polarizing plate and the transmission axis may pass through the second polarization plate perpendicular to the transmission axis.

The light passing through the second polarizing plate 260 through the above process reaches the optical filter 100. As shown in FIG. 2, the optical filter 100 of the present invention includes a λ / 2 phase delay layer 140, a λ / 4 phase difference layer 130, an index pattern 120, and a transparent substrate 110.

The λ / 2 phase delay layer 140 is to allow the right eye image light generated in the right eye image generation region and the left eye image light generated in the left eye image generation region to have different polarization states, and the right eye image generation region or the left eye image Only the region corresponding to one of the generation regions is selectively formed. For example, when the λ / 2 phase delay layer 140 is formed in a region corresponding to the right eye image generation region R, the right eye image light generated in the right eye image generation region of the image generator 220 is λ / 2. The polarization axis is rotated 90 degrees while passing through the phase delay layer 140. However, since there is no λ / 2 phase delay layer in the region corresponding to the left eye image generation region, the left eye image light does not pass through the λ / 2 phase delay layer, and no polarization axis rotation occurs. Therefore, after passing through the λ / 2 phase delay layer 140, the right eye image light and the left eye image light have polarization axes perpendicular to each other.

Meanwhile, the λ / 2 phase delay layer may be formed of a reactive liquid crystal, for example, a nematic liquid crystal. In the reactive liquid crystal, a liquid crystal monomer is polymerized by light or heat to form a liquid crystal polymer. At least one selected from those having an acrylate group may be used as a reactor for causing a polymerization reaction of such a reactive liquid crystal monomer.

Representative examples of the reactive liquid crystal monomers include, but are not limited to, Merck's RM (Reactive Mesogen), BASF's LC242 (trade name), and the like.

The λ / 2 phase retardation layer may be formed according to a method well known in the art, for example, by forming an alignment layer on one surface of a substrate, coating the liquid crystal on the alignment layer, and then crosslinking the same. have. In this case, the substrate may be used without limitation as long as the substrate is optically transparent and does not have a phase difference. However, the substrate may be a cycloolefin polymer such as triacetyl cellulose or a norbornene derivative without a phase difference. After the lambda / 2 phase delay layer is formed in the same manner as described above, the lambda / 2 phase delay layer is selectively removed by etching, so that only the region corresponding to either the right eye image generation region or the left eye image generation region is applied. It is possible to have a two phase delay layer. A detailed method of forming and selectively removing the λ / 2 phase delay layer will be described later.

Next, the λ / 4 phase delay layer 130 is used to convert linearly polarized light into circularly polarized light, and is formed over the entire area of the optical filter to cover both the right eye image generation area and the left eye image generation area.

The reason for forming the lambda / 4 phase delay layer 130 in the present invention is to improve the viewing angle in the vertical direction. Even when the right eye image generating region and the left eye image generating region have only linear polarization perpendicular to each other, different images may be introduced into both eyes to feel a three-dimensional effect. However, when only vertical or horizontal linearly polarized light is used, since the left and right viewing angles can be secured to almost 180 degrees, it can be said to be suitable for multiple viewing, but the vertical viewing angle has a disadvantage of dropping to about 10 degrees. In other words, even if the head is slightly tilted, the image may appear broken due to the difference in height between the two eyes. Therefore, in the present invention, the above-described problem is solved by forming the linearly polarized light by forming the λ / 4 phase retardation layer after the λ / 2 phase retardation layer.

The left eye image light and the right eye image light are converted into circularly polarized light while passing through the λ / 4 phase retardation layer 130. In this case, as described above, the left eye image light and the right eye image light have polarization axes perpendicular to each other while passing through the λ / 2 phase retardation layer, and thus have reverse rotation directions after passing through the λ / 4 phase retardation layer. do. That is, in the right circular polarization of the right eye image light, the left eye image light becomes a left circularly polarized state.

Meanwhile, the optical filter 100 of the present invention includes a transparent substrate 110 having an index pattern 120 formed at a portion corresponding to a boundary between the right eye image generating region R and the left eye image generating region L. FIG. The index pattern 120 plays a role of reference in the selective removal of the λ / 2 phase delay layer. As shown in the present invention, the index pattern 120 corresponds to a boundary between the right eye image generation region and the left eye image generation region. In this case, the λ / 2 phase delay layer may be removed by a simple method such as laser etching while checking the index pattern in the selective removal process of the λ / 2 phase delay layer to be described later. Therefore, the λ / 2 phase retardation layer can be selectively formed only at a desired position without going through a complicated step such as a photo process, and precise alignment can be obtained because etching can be performed while visually checking the index pattern. .

The index pattern may be formed by printing a pattern on a substrate using an ink in which a black pigment and a binder are dispersed in a solvent, and in this case, it is preferable to use a high boiling point solvent for continuous workability. As such, when the index pattern is formed using the black pigment, not only the visibility is excellent, but also the index pattern performs the light blocking procedure in the boundary region between the right eye image generation region R and the left eye image generation region L. An additional effect of preventing crosstalk between the eye image and the left eye image can also be obtained.

In addition, in order to realize a fine line width, the smaller the particle of the black pigment is, the better, and preferably, the particle diameter of the black pigment is 5 μm or less.

In addition, the height of the index pattern is preferably about 1 to 20% of the line width. If the height of the index pattern is less than 1% of the line width, the black pigment content is low, and the visibility and light blocking effect are not good. If the height of the index pattern exceeds 20%, there is a risk of bubbles due to irregularities when attached to other films. have.

On the other hand, the transparent substrate 110 is to improve the dimensional stability by supporting the whole optical filter to prevent the deformation occurs during the etching process, it is excellent in flatness, optically transparent substrate, for example, glass Substrates and the like can be used.

3 shows a step-by-step method for manufacturing the optical filter of the present invention. As shown in FIG. 3, the optical filter manufacturing method of the present invention includes (1) forming an index pattern on a transparent substrate, and (2) a λ / 4 phase delay layer and a λ on a transparent substrate on which the index pattern is formed. Forming a / 2 phase retardation layer laminate and (3) selectively removing the λ / 2 phase retardation layer.

Hereinafter, the optical filter manufacturing method of the present invention will be described in more detail for each step.

(1) index pattern forming step

First, an index pattern is formed on one surface of a transparent substrate. As described above, a substrate having excellent flatness, for example, a glass substrate, may be used as the transparent substrate, and the index pattern is formed at a position corresponding to the boundary between the right eye image generator and the left eye image generator of the image display unit. .

The index pattern may be formed by printing a black pigment and an ink in which a binder is dispersed in a solvent by a printing method such as screen printing, offset printing, gravure printing, flexographic printing, or the like.

Black pigments that can be used include, but are not limited to, inorganic pigments such as carbon black, graphite, iron oxide, or organic pigments having various colors of azo or phthalocyanine, and the like. For example, polyester type, polystyrene type, polyurethane type, acrylic type, epoxy type resin, or a combination thereof can be used. In addition, as a solvent, although it is not restrict | limited, For example, Terpineol, Butyl Carbitol Acetate (BCA), Butyl Cellosolve (BC), etc. can be used.

In this case, when the line width of the index pattern is relatively large, about 200 μm, it is preferable to use the screen printing method, and in the case where fine line width of 100 μm or less is required or when the straightness of the line is important, precise offset printing is performed. It is preferable to use.

In addition, in order to realize a fine line width, the smaller the particle of the black pigment is, the better, preferably 5 μm or less.

In addition, the height of the printed pattern is preferably about 1 to 20% of the line width. When the print height is less than 1% of the line width, the content of the black pigment is small, so that the visibility and the light blocking effect are not good, and when the print height is more than 20%, there is a risk of air bubbles due to irregularities when attached to other films.

(2) lambda / 4 phase delay layer and lambda / 2 phase delay layer forming step

Next, a λ / 4 phase delay layer and a λ / 2 phase delay layer are laminated on the substrate on which the index pattern is formed. In this case, the lamination is performed on the surface on which the index pattern is formed.

The lamination may be performed by forming an adhesive layer on a transparent substrate on which an index pattern is formed, and then sequentially laminating a λ / 4 phase retardation layer and a λ / 2 phase retardation layer. After the laminate of the lambda / 2 phase retardation layer is provided, the laminate may be attached onto a transparent substrate.

The laminate of the λ / 4 phase retardation layer and the λ / 2 phase retardation layer may be manufactured by, for example, forming a λ / 2 retardation layer on one side of the substrate and forming a λ / 4 phase retardation layer on the other side. Can be. In this case, it is preferable that the substrate is optically transparent and there is no phase difference. The substrate having no retardation is made of an isotropic material having substantially no difference in refractive index in the plane direction or the thickness direction, and refers to a substrate in which the retardation does not change even when etched by a laser or the like. The reason for using a substrate having no phase difference may be damage to the substrate during the selective removal of the λ / 2 phase retardation layer. If the substrate has a phase difference, the desired phase difference value may not be obtained due to such damage. to be.

 More specifically, the λ / 2 phase retardation layer may be formed by forming an alignment film on one surface of the transparent substrate, applying a reactive liquid crystal, for example, a nematic liquid crystal, onto the alignment film and then crosslinking the same. In this case, the reactive liquid crystal is formed of a liquid crystal polymer while the liquid crystal monomers are polymerized with each other by light or heat, and one or more selected from those having an acrylate group attached thereto may be used as a reactor for causing a polymerization reaction of the reactive liquid crystal monomer. . Representative examples of such reactive liquid crystal monomers include Merck's RM (Reactive Mesogen), BASF's LC242 (trade name), and the like.

On the other hand, the λ / 4 phase retardation layer may be formed of a reactive liquid crystal like the λ / 2 phase retardation layer, or may be formed of a stretched polymer film or a polymer film having a controlled refractive index in the thickness direction.

In the case of forming a lambda / 4 phase delay layer using a reactive liquid crystal, an alignment film is formed on the other side of the transparent substrate on which the lambda / 2 phase delay layer is formed, on which no lambda / 2 phase delay layer is formed, and the alignment film After apply | coating a liquid crystal on it, a laminated body of (lambda) / 2 phase retardation layer and (lambda) / 4 phase retardation layer can be manufactured by crosslinking. In this case, it is preferable that the λ / 2 phase delay layer and the λ / 4 phase delay layer have alignment directions perpendicular to each other.

On the other hand, when the lambda / 4 phase retardation layer is formed by using a polymer film by a method of attaching the polymer film on the other side where the lambda / 2 phase delay layer of the transparent substrate formed of the lambda / 2 phase delay layer is not formed A laminate of a lambda / 4 phase delay layer and a lambda / 2 phase delay layer can be produced.

Next, the lambda / 4 phase delay layer and the lambda / 2 phase delay layer laminate prepared in the above manner are attached onto the substrate. At this time, the attachment is made on the surface on which the index pattern is formed, and may be performed using an adhesive or the like.

More specifically, in this step, a pressure-sensitive adhesive layer is formed by applying a pressure-sensitive adhesive on the lower portion of the laminate, that is, the lower portion of the λ / 4 phase retardation layer, and then attach a transparent substrate on which an index pattern is formed, or an index pattern on the transparent substrate. After forming the pressure-sensitive adhesive layer by applying the pressure-sensitive adhesive on the formed surface, it can be carried out by a method of attaching the laminate thereon.

In this case, the adhesive resin may be a pressure-sensitive resin commonly used in the art, that is, a pressure-sensitive resin used in a general pressure-sensitive adhesive sheet, a pressure-sensitive adhesive film, and the like, as long as it does not limit the transmission of light, and is not particularly limited. . For example, the adhesive resin may be acrylic, urethane, polyisobutylene, SBR (styrene-butadiene rubber), rubber, polyvinyl ether, epoxy, melamine, polyester, phenol or silicone resin, or Copolymers thereof and the like can be used, and acrylic adhesives are particularly preferable.

As described above, by attaching the phase delay layers on the transparent substrate, it is possible to secure the dimensional stability upon selective removal of the λ / 2 phase delay layer to be described later. A polymer film is generally used as the base film of the phase retardation layers, but the polymer film is difficult to form a constant pattern because of poor dimensional stability. However, when the substrate having excellent flatness (for example, a glass substrate) is bonded to the bottom of the phase retardation layer laminate as in the present invention, the dimensional stability is improved and the index pattern formed on the glass substrate is used as a reference line. Since the pattern can be formed while checking the position of the index pattern, alignment is easy.

(3) selectively removing the λ / 2 phase delay layer

Next, the λ / 2 phase delay layer is selectively removed so that the λ / 2 phase delay layer exists only in a region corresponding to one of the left eye image generation region and the right eye image generation region.

This step can be performed by etching the [lambda] / 2 phase retardation layer using a suitable energy source and does not require light blocking means such as a mask. That is, for example, the selective removal of the λ / 2 phase delay layer of the present invention may be performed by directly irradiating an λ / 2 phase delay layer with an energy source such as a laser beam without a mask.

In this case, it is preferable to use an energy source having a wavelength absorbed by the λ / 2 phase retardation layer but not absorbed by the transparent substrate under the λ / 2 phase retardation layer. In this case, the energy irradiated to the λ / 2 phase retardation layer generates heat while being absorbed by the λ / 2 phase retardation layer, and the λ / 2 phase retardation layer is thermally decomposed by the generated heat. However, the substrate under the λ / 2 phase retardation layer does not thermally decompose because it transmits the wavelength of irradiated energy, and as a result, only the λ / 2 phase retardation layer is selectively removed.

For example, when using a cyclo olefin polymer (COP) film as the base material of the lambda / 2 phase retardation layer, and when the lambda / 2 phase delay layer is formed using an acrylic liquid crystal, by using a CO ₂ laser of 10600nm wavelength, Only the λ / 2 phase delay layer can be selectively removed. This is because a CO ₂ laser having a wavelength of 10600 nm is not absorbed by the COP but is absorbed by the acrylic liquid crystal film.

As described above, when irradiating an energy source such as a laser for selective removal of the λ / 2 phase retardation layer, the λ / 2 phase is applied to a desired position by irradiating a laser or the like while checking the position of the index pattern formed on the transparent substrate. The retardation layer can be formed. As described above, the index pattern is formed at the boundary between the right eye image generating region and the left eye image generating region. Therefore, the position corresponding to the right eye image generation region and the left eye image generation region can be known through the position of the index pattern. When laser etching is performed along the index pattern, a λ / 2 phase delay layer pattern is accurately formed at a desired position. can do.

Hereinafter, the optical filter manufacturing method of the present invention will be described in more detail with reference to specific examples.

[Example]

An index pattern having a line width of 500 μm, an interval of 500 μm, and a height of 40 μm was printed on a glass substrate having a thickness of 1.3 mm by using a screen printing method. The printing ink used was Seiko 1300 Black.

Separately, a poly cinnamate polymer film was formed by a roll coating method on a cyclo olefin polymer substrate without a phase difference of 65 microns in thickness so as to have a thickness of 1000 kPa after drying. Thereafter, the resultant was heated in an oven at 80 ° C. for 2 minutes to remove a solvent from the coating film, thereby forming a coating film. Thereafter, UV polarization having an intensity of 300 mW / cm ² was irradiated on the poly cinnamate polymer film to form an alignment film oriented 45 degrees with respect to the advancing direction.

Thereafter, a liquid crystal solution in which 25% by weight of cyano biphenyl acrylate was dissolved in 80% of toluene was coated on the surface of the polymer substrate by a roll coating method. After coating, the thickness of the liquid crystal layer was controlled to about 2 micrometers after drying. The coated isotropic liquid crystal layer was dried in a drying oven at a temperature of 50 ° C. for 2 minutes to fix the liquid crystal layer oriented in the 45 degree direction. The fixed liquid crystal layer was then cured by a UV curing process to form a solid λ / 2 phase retardation layer.

Thereafter, a poly cinnamate polymer film was formed on the opposite side on which the λ / 2 phase retardation layer was formed by a roll coating method, and dried at 80 ° C. for 2 minutes to form a polymer film. Thereafter, the polymer film was irradiated with polarized UV to form an alignment film having a λ / 2 phase retardation layer and an orientation angle of 90 degrees. A λ / 4 phase retardation layer having a thickness of 1.0 micrometer was formed on the alignment layer under the same conditions as the λ / 2 wavelength phase retardation layer.

Through the above process, a retardation film laminate in which the λ / 2 wavelength phase retardation layer and the λ / 4 phase retardation layer were laminated could be obtained. The adhesive was then applied to the lambda / 4 phase retardation layer and laminated on the glass substrate having the index pattern prepared above.

Then, using a CO ₂ laser of 10.6 μm (micrometer) wavelength, the λ / 2 wavelength phase retardation layer was selectively removed to form a line of 500 μm (micrometer) thickness at intervals of 500 μm (micrometer). Formed a pattern. The energy and the scan speed of the laser to be exposed are adjusted to completely remove the λ / 2 wavelength phase delay layer of the laser irradiated portion. Laser conditions used for exposure were exposed to 1.4W at a frequency of 25kHz, and processed at a speed of 4.0 ~ 4.5cm per second.

1 is a view showing the configuration of a stereoscopic image display device of the present invention.

2 is a view showing the structure of the optical filter of the present invention.

3 is a view for explaining the manufacturing method of the optical filter of the present invention.

Claims (17)

Forming an index pattern on one surface of the transparent substrate; Forming the λ / 4 phase delay layer and the λ / 2 phase delay layer on the surface on which the index pattern of the transparent substrate is formed; And And selectively removing the λ / 2 phase delay layer. The method of claim 1, And the index pattern is formed at a position corresponding to a boundary between a right eye image generation region and a left eye image generation region of the stereoscopic image display apparatus. The method of claim 1, The index pattern is formed by a printing method. The method of manufacturing an optical filter for a stereoscopic image display device. The method of claim 1, Forming the λ / 4 phase delay layer and the λ / 2 phase delay layer providing a laminate of the λ / 4 phase delay layer and the λ / 2 phase delay layer; And And attaching the stack of the λ / 4 phase delay layer and the λ / 2 phase delay layer on a surface on which an index pattern of the transparent substrate is formed. The method of claim 4, wherein Providing the laminate of the λ / 4 phase delay layer and the λ / 2 phase delay layer includes forming alignment layers on the top and bottom surfaces of the transparent substrate, respectively, and applying liquid crystal on the alignment layers, respectively. The manufacturing method of the optical filter for image display apparatuses. The method of claim 5, The liquid crystal alignment directions of the λ / 4 phase delay layer and the λ / 2 phase delay layer are perpendicular to each other. The method of claim 4, wherein Preparing a laminate of the λ / 4 phase delay layer and the λ / 2 phase delay layer Forming an alignment layer on one surface of the transparent substrate and coating a liquid crystal on the alignment layer to form a λ / 2 phase delay layer; And A method of manufacturing an optical filter for a stereoscopic image display device comprising attaching a λ / 4 phase delay plate in the form of a film to the other surface of the transparent substrate. The method of claim 1, Selectively removing the λ / 2 phase delay layer is performed by laser etching. The method of claim 8, The method for manufacturing an optical filter for a stereoscopic image display device, wherein the etching is performed based on the index pattern during the laser etching. The method of claim 8, And said laser is a laser having a wavelength absorbed by said lambda / 2 phase delay layer and not absorbed by a substrate on which said lambda / 2 phase delay layer is formed. An optical filter used in a stereoscopic image display device including a right eye image generation region for generating right eye image light and a left eye image generation region for generating left eye image light, Transparent substrates; An index pattern positioned on one surface of the transparent substrate and formed in an area corresponding to a boundary between a right eye image generation area and a left eye image generation area of the stereoscopic image display device; A λ / 4 phase delay layer formed on a surface on which an index pattern of the transparent substrate is formed; And And a λ / 2 phase delay layer positioned on the λ / 4 phase delay layer and selectively formed in a region corresponding to one of the right eye image generation region and the left eye image generation region. The method of claim 11, And the transparent substrate is a glass substrate. The method of claim 11, The index pattern has a height of 1 to 20% of the line width, the optical filter for a stereoscopic image display device. The method of claim 11, The lambda / 4 phase delay layer is an optical filter for a stereoscopic image display device consisting of a reactive liquid crystal. The method of claim 11, The lambda / 4 phase delay layer is an optical filter for a stereoscopic image display device consisting of a polymer film subjected to stretching treatment or refractive index control treatment. The method of claim 11, The lambda / 2 phase delay layer is an optical filter for a stereoscopic image display device made of a reactive liquid crystal. Light source; An image generator including a right eye image generation region for generating right eye image light and a left eye image generation region for generating left eye image light; A first polarizer disposed between the image generator and a light source; A second polarizer disposed on the light exit surface side of the image generator; And An optical filter disposed on the second polarizing plate side; The optical filter is a transparent substrate; An index pattern on the transparent substrate and formed in an area corresponding to a boundary between the right eye image generation area and the left eye image generation area; A λ / 4 phase delay layer formed on a surface on which an index pattern of the transparent substrate is formed; And a λ / 2 phase delay layer positioned on the λ / 4 phase delay layer and selectively formed in a region corresponding to one of the right eye generation region and the left eye image generation region.

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