KR101447994B1 - Optical retarder film and method of manufacturing for the same and display device using the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase retardation film, a method of manufacturing the same, and a display device having the phase retardation film. The phase retardation film comprises a plurality of projections And the plurality of projected line patterns have a liquid crystal orientation that aligns the liquid crystal molecules to be arranged adjacent to each other.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical phase retardation film, a method of manufacturing the same, and a display device having the optical phase retardation film.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical phase retardation film, a manufacturing method thereof, and a display device having the same, and more particularly, to a phase retardation film for rotating linearly polarized light by 90 degrees or converting it into circularly polarized light or elliptically polarized light, And a display device having the same.

There are many kinds of display devices. Among them, liquid crystal display (LCD) devices having improved performance and miniaturization and light weight due to the rapidly developing semiconductor technology are becoming popular display devices.

The liquid crystal display has advantages such as miniaturization, light weight and low power consumption, and thus it has been attracting attention as an alternative means to overcome the disadvantages of a cathode ray tube (CRT). Currently, it is used not only in small-sized products such as a mobile phone, a PDA (personal digital assistant), and a portable multimedia player (PMP) that require a display device but also a monitor and a TV It is used in equipment.

Among them, a liquid crystal display device mounted in a small product such as a mobile phone, a PDA, and a PMP is formed as a reflective type or a semi-transmissive type in order to save power and improve luminance and contrast ratio. And a reflective film formed inside the reflective film for reflecting an external light to display an image. The reflection type or semi-transmission type liquid crystal display device includes a light phase retardation film which rotates linearly polarized light passing through the polarizing plate by 90 degrees or converts into circularly polarized light or elliptically polarized light.

The transmissive liquid crystal display device may also include a light phase retardation film if necessary.

The optical phase retardation film may have various retardations depending on the kind of the liquid crystal display device and the position where it is used.

However, the conventional optical phase retardation film has a complicated manufacturing process, which causes a decrease in the productivity of the liquid crystal display as a whole. Further, the conventional optical phase retardation film is formed separately from the alignment film for aligning the liquid crystal molecules of the liquid crystal layer.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a phase retardation film for aligning adjacent liquid crystal molecules while rotating linearly polarized light by 90 degrees or converting the polarized light into circularly polarized light or elliptically polarized light.

It is another object of the present invention to provide a manufacturing method that can easily and efficiently produce the optical phase retardation film described above.

It is another object of the present invention to provide a display device having the above-described optical phase-retarding film.

The optical phase retardation film according to the present invention comprises a plurality of projected line patterns made of a photocurable liquid crystal polymer and having a retardation in the range of 0 to? / 2, and the plurality of projected line patterns are oriented And a liquid crystal alignment property.

The plurality of projection line patterns may have different longitudinal directions.

Wherein the plurality of projection line patterns include a first projection line pattern whose longitudinal direction is a first direction and a second projection line pattern whose longitudinal direction is a second direction different from the first direction, The piercing angle in the direction may be 45 degrees.

The plurality of projection line patterns may have different phase differences.

The plurality of projection line patterns may include a first projection line pattern having anisotropy and a second projection line pattern having an isotropy of zero phase difference.

In the above optical phase retardation film, the major axis direction of the liquid crystal molecules to be disposed adjacent to each other may be horizontally oriented so as to be substantially parallel to the longitudinal direction of the plurality of projection line patterns in the field member state.

Further, in the above optical phase retardation film, the major axis direction of the liquid crystal molecules to be disposed adjacent to each other may be vertically aligned so as to be substantially parallel to the direction of embossment of the plurality of projection line patterns in the field member state.

The plurality of protrusion line patterns may be subjected to a surface treatment with a silane.

The method of manufacturing the optical phase retardation film according to the present invention includes the steps of: coating a photocurable liquid crystal polymer layer on a substrate; imprinting the photocurable liquid crystal polymer layer with a polymer mold having a plurality of recessed line patterns; imprinting the imprinted liquid crystal polymer layer onto the imprinted liquid crystal polymer layer, and irradiating the imprinted liquid crystal polymer layer with unpolarized ultraviolet light.

A plurality of protrusion line patterns corresponding to the recessed line patterns of the polarizer mold are formed in the photo-curable liquid crystal polymer layer, the plurality of protrusion line patterns having a phase difference in the range of 0 to? / 2, Lt; / RTI >

Wherein the plurality of projection line patterns include a first projection line pattern whose longitudinal direction is a first direction and a second projection line pattern whose longitudinal direction is a second direction different from the first direction, Lt; RTI ID = 0.0 > 45 < / RTI >

The coating is spin-coated. The higher the speed of the coating, the closer the phase difference of the plurality of projection line patterns becomes to? / 2, and the higher the concentration of the photocurable liquid crystal polymer layer, The phase difference can be close to zero.

Another optical phase retardation film manufacturing method according to the present invention includes the steps of coating a photocurable liquid crystal polymer layer on a substrate and imprinting the photocurable liquid crystal polymer layer with a polymer mold having a submerged line pattern imprinting the imprinted liquid crystal polymer layer; irradiating a region of the photocurable liquid crystal polymer layer imprinted with ultraviolet light that is not selectively polarized by using a mask; And applying heat so as to have an obtuse temperature.

Irradiating the heated photo-curable liquid crystal polymer layer with unpolarized ultraviolet light as a whole.

The preset temperature may be at least 180 degrees Celsius.

And a protrusion line pattern corresponding to the recessed line pattern of the polymer mold is formed on the photo-curable liquid crystal polymer layer, and the protrusion line pattern is formed on one side of the photocurable liquid crystal polymer layer selectively exposed to ultraviolet rays using the mask And a second projection line pattern corresponding to another area of the photo-curable liquid crystal polymer layer which is not selectively exposed to ultraviolet light using the mask, the second projection line pattern having anisotropy, The projection line pattern may have a phase difference within a range of greater than 0 and less than or equal to? / 2, and the second projection line pattern may have a phase difference of zero.

The coating is spin-coated. The higher the speed of the coating, the closer the phase difference of the plurality of projection line patterns becomes to? / 2, and the higher the concentration of the photocurable liquid crystal polymer layer, The phase value can be close to zero.

The method may further include a step of subjecting the surface of the photo-curable liquid crystal polymer layer to a silane treatment.

A display device according to the present invention includes a first substrate, a second substrate facing the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate and including a plurality of liquid crystal molecules, A phase retardation film disposed between the first substrate and the liquid crystal layer and between the second substrate and the liquid crystal layer, the optical phase retardation film being made of a photo-curable liquid crystal polymer, And a plurality of projection line patterns having a phase difference in the range, and the plurality of projection line patterns may have liquid crystal orientation that aligns liquid crystal molecules of the liquid crystal layer.

The plurality of projection line patterns may have different longitudinal directions.

Wherein the plurality of projection line patterns include a first projection line pattern whose longitudinal direction is a first direction and a second projection line pattern whose longitudinal direction is a second direction different from the first direction, The piercing angle in the direction may be 45 degrees.

The plurality of projection line patterns may have different phase differences.

The plurality of projection line patterns may include a first projection line pattern having anisotropy and a second projection line pattern having an isotropy of zero phase difference.

In the above-described display device, the longitudinal axes of the liquid crystal molecules may be horizontally oriented so as to be substantially parallel to the longitudinal direction of the plurality of projection line patterns in the field-free state.

In the above-described display device, the longitudinal axes of the liquid crystal molecules may be vertically aligned so as to be substantially parallel to the direction of the rise of the plurality of projection line patterns in the field-free state.

The plurality of protrusion line patterns may be subjected to a surface treatment with a silane.

According to the present invention, the optical phase retardation film can rotate linearly polarized light by 90 degrees, convert it into circularly polarized light or elliptically polarized light, and orient adjacent liquid crystal molecules.

That is, the optical phase retardation film can selectively adjust the region where the linearly polarized light is rotated by 90 degrees or converted into circularly polarized light or elliptically polarized light, if necessary. Therefore, the light is absorbed by the polarizer, and the decrease in the overall luminance and contrast ratio can be minimized.

In addition, since the liquid crystal aligning property for aligning adjacent liquid crystal molecules is provided, the alignment film can be also performed.

Further, according to the present invention, it is possible to easily and efficiently produce the optical phase retardation film.

Further, according to the present invention, it is possible to provide a display device provided with the optical phase retardation film.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In the drawings, the thicknesses are enlarged to clearly illustrate the various layers and regions. Like parts are designated with like reference numerals throughout the specification. Whenever a portion such as a layer, film, region, plate, or the like is referred to as being "on" or "on" another portion, it includes not only the case where it is "directly on" another portion but also the case where there is another portion in between. Conversely, when a part is "directly over" another part, it means that there is no other part in the middle.

Further, the optical phase retardation film and the display device having the optical phase retardation film are not limited to the structure shown in the accompanying drawings, and may have various structures within a range that can be easily changed by a person skilled in the art.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In addition, in the various embodiments, components having the same configuration are denoted by the same reference symbols in the first embodiment. In the other embodiments, only components different from those in the first embodiment will be described.

[Example 1]

A first embodiment according to the present invention will be described with reference to Figs. 1 to 3. Fig.

1 is a perspective view of a phase retarder film 500 according to a first embodiment of the present invention. 1, reference numeral 101 denotes a substrate on which the optical phase retardation film 500 is formed. 1, the optical phase retardation film 500 includes a film body portion 550 and a plurality of protrusion line patterns 510 and 520 formed on the film body portion 550. The protrusion line patterns 510 and 520 include a plurality of inflection lines 511 and 521 and a plurality of goal lines 512 and 522 located between the inflection lines 511 and 521, respectively.

The plurality of projection line patterns 510 and 520 have different longitudinal directions. That is, the plurality of protrusion line patterns 510 and 520 includes a first protrusion line pattern 510 whose longitudinal direction is the first direction and a second protrusion line pattern 520 whose longitudinal direction is the second direction different from the first direction ). Here, the piercing angle between the first direction and the second direction is 45 degrees. Here, the longitudinal direction refers to the direction of the formation caused by the bending lines 511 and 521 of the protrusion line patterns 510 and 520 and the goal lines 512 and 522.

Although the first projection line pattern 510 and the second projection line pattern 520 are alternately arranged in FIG. 1, the present invention is not limited thereto. Accordingly, the first protrusion line pattern 510 and the second protrusion line pattern 520 can be freely arranged in various shapes as required, and the area of the first protrusion line pattern 510 in the optical phase retardation film 500 And the area of the second protrusion line pattern 520 can be freely set as needed.

The optical phase retardation film 500 may have a polarizing plate 150 or 250 (shown in FIG. 12) of the display device 900 having the optical retardation film 500 in either the first direction or the second direction. And the other one of the first direction and the second direction is disposed inside the display device 900 so as to form a piercing angle of 45 degrees with the polarization axis.

Further, the plurality of projected line patterns 510 and 520 have a phase difference within the range of 0 to? / 2. Specifically, the phase difference of the protrusion line patterns 510 and 520 may be set to 0,? / 4 (see FIG. 4) depending on the type of display device in which the optical phase- Or a phase difference of lambda / 2, and may have various phase differences within a range of 0 to lambda / 2, as the case may be.

In addition, the plurality of projection line patterns 510 and 520 have the same phase difference with each other. However, the present invention is not limited thereto. Accordingly, the plurality of projection line patterns 510 and 520 having different longitudinal directions may have different phase differences.

Further, the plurality of projected line patterns 510 and 520 have a liquid crystal aligning property for aligning the liquid crystal molecules to be disposed adjacent to each other. The protrusion line patterns 510 and 520 including the bump lines 511 and 521 and the goal lines 512 and 522 direct structurally adjacent liquid crystal molecules. That is, the liquid crystal molecules are aligned along the grain direction of the protrusion line patterns 510 and 520. Therefore, the optical phase retardation film 500 according to the present invention can also function as an alignment layer.

In FIG. 1, reference numerals 301 and 302 illustrate liquid crystal molecules which are aligned by the protrusion line patterns 510 and 520 of the optical retardation film 500. Reference numeral 301 denotes liquid crystal molecules horizontally aligned by the protrusion line patterns 510 and 520 of the optical phase-retardation film 500, and reference numeral 302 denotes vertically aligned liquid crystal molecules.

The protrusion line patterns 510 and 520 horizontally align the liquid crystal molecules 301 structurally. That is, the major axis direction of the liquid crystal molecules 301 is oriented substantially parallel to the longitudinal direction of the projection line patterns 510 and 520 in the field-free state.

However, the present invention is not limited thereto. Thus, the protrusion line patterns 510 and 520 may vertically align the liquid crystal molecules 302. [ That is, the major axis direction of the liquid crystal molecules 302 is oriented substantially in parallel with the direction of embossing of the projecting line patterns 510 and 520, specifically, the direction of embossing of the bump lines 511 and 521 in the field member state. However, in order for the protrusion line patterns 510 and 520 to vertically align the liquid crystal molecules 302, the surfaces of the protrusion line patterns 510 and 520 must be processed. The silane treatment refers to coating the surface of the projection line patterns 510 and 520 with an affinity silane material. As the silane treatment, various known treatment methods that can be easily conducted by a person skilled in the art can be used.

(Please give us specific explanation about silane treatment.)

Since the first projection line pattern 510 and the second projection line pattern 520 align the liquid crystal molecules in different directions, the first projection line pattern 510 and the second projection line pattern 520 are used A multi-domain in which one pixel is divided into a plurality of domains may be formed. A pixel is a minimum unit in which a display device displays an image.

Further, the optical phase retardation film 500 is made of a photo-curable liquid crystal polymer. The photo-curable liquid crystal polymer refers to a liquid crystal polymer that is cured upon irradiation with light such as ultraviolet light. As the photo-curable liquid crystal polymer, various known types which can be easily carried out by a person skilled in the art can be used.

(Please specify the type and composition of the photo-curable liquid crystal polymer.)

FIGS. 2A and 2B show the result of observing the optical phase retardation film 500 disposed between a pair of polarizing plates having polarization axes crossed by an electron microscope.

2A and 2B, reference symbol AP denotes the directions of the polarization axes of the pair of polarizing plates. Reference numeral A51 denotes a first direction in the longitudinal direction of the first projection line pattern 510 and reference symbol A52 denotes a second direction in the longitudinal direction of the second projection line pattern 520. [ 2A and 2B, the first projection line pattern 510 and the second projection line pattern 520 have a phase difference of? / 4.

2A shows a state in which the longitudinal direction of the second projection line pattern 520, that is, the second direction A52 coincides with one of the polarization axis directions AP of the pair of polarizing plates, and FIG. 510, that is, the first direction A51 coincides with one of the polarization axis directions AP of the pair of polarizing plates. FIG. 2B shows the optical phase retardation film 500 of FIG. 2A rotated by 45 degrees.

2A and 2B, the protrusion line patterns 510 and 520 having the same length direction as one of the polarization axis directions AP of the pair of polarizing plates can not pass through the light and are darkly displayed. The protrusion line patterns 510 and 520, which intersect the polarization axis directions AP of the pair of polarizing plates at an angle of 45 degrees, are brightly displayed through the light. Here, FIGS. 2A and 2B show the inverted aspects. The first projected line pattern 510 and the second projected line pattern 520 have a phase difference of? / 4 and rotate the light linearly polarized by the polarizing plate by 90 degrees or convert the light into circularly polarized light or elliptically polarized light. Therefore, when one of the longitudinal direction of the protruding line patterns 510 and 520 and the direction of the polarization axis of the polarizing plate coincide, the light is not passed again through the polarizing plate and becomes dark.

3 is a graph showing a result of measuring the optical anisotropy value of the optical phase retardation film 500 of FIG. As shown in Fig. 3, the first projection line pattern 510 and the second projection line pattern 520 have different optical axes. That is, the first projection line pattern 510 and the second projection line pattern 520 both have a phase difference of? / 4 and show a difference of only 45 degrees in the direction.

With such a configuration, the optical phase retardation film 500 can selectively adjust the area where linearly polarized light is rotated by 90 degrees or converted into circularly polarized light or elliptically polarized light, if necessary. Therefore, the light is absorbed by the polarizer, and the decrease in the overall luminance and contrast ratio can be minimized.

Here, if the protrusion line patterns 510 and 520 of the optical retardation film 500 have a retardation of? / 4, the linearly polarized light is circularly polarized. If the projection line patterns 510 and 520 have a phase difference of? / 2, the linearly polarized light is converted into 90-degree linearly polarized light. If the projection line patterns 510 and 520 have other phase differences, the linearly polarized light is elliptically polarized.

In addition, since the liquid crystal aligning property for aligning adjacent liquid crystal molecules is provided, the alignment film can be also performed.

In addition, a multi-domain may be formed using the first projection line pattern 510 and the second projection line pattern 520 having different longitudinal directions.

Hereinafter, a method for manufacturing the optical phase retardation film 500 of FIG. 1 according to the first embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG.

First, as shown in FIG. 4, a photocurable liquid crystal polymer layer 501 is coated on a substrate 101. Here, the coating uses a spin coating method. However, the present invention is not limited thereto, and various known coating methods can be used.

Then, the photo-curable liquid crystal polymer layer 501 is imprinted on the polymer mold 700. Here, the polymer mold 700 has a plurality of recessed line patterns 710 and 720. The submerged line pattern includes a first submerged line pattern 710 and a second submerged line pattern 720. The first recessed line pattern 710 forms the first protrusion line pattern 510 of the optical phase retardation film 500 and the second recessed line pattern 720 forms the second protrusion line pattern 510 of the optical phase- Pattern 520 is formed. Further, the polymer mold 700 is made of various resin-based materials having heat resistance and being transparent.

(Please give me specific explanation about the material of the polymer mold.)

Next, as shown in Fig. 5, the photo-curable liquid crystal polymer layer 502 imprinted, that is, the photo-curable liquid crystal polymer layer 502 bonded with the polymer mold 700 is irradiated with unpolarized ultraviolet light. At this time, since the polymer mold 700 is transparent, ultraviolet light can be freely irradiated in various directions. The photo-curable liquid crystal polymer layer 502 is cured by receiving ultraviolet light.

Next, when the polymer mold 700 is separated, the optical phase retardation film 500 having the first protrusion line pattern 510 and the second protrusion line pattern 520 is formed.

At this time, the first protrusion line pattern 510 and the second protrusion line pattern 520 can be adjusted in the manufacturing process of the optical phase retardation film so as to have a desired retardation within the range of 0 to? / 2. Specifically, in the course of coating the photocurable liquid crystal polymer layer 501 on the substrate 101 through spin coating, the phase difference of the protrusion line patterns 510 and 520 relatively increases as the coating speed increases, It gets closer. On the other hand, the higher the concentration of the photo-curable liquid crystal polymer layer 501 is, the closer the phase difference of the projection line patterns 510 and 520 becomes to zero.

By such a manufacturing method, the optical phase retardation film 500 capable of rotating linearly polarized light by 90 degrees or converting it into circularly polarized light or elliptically polarized light and orienting adjacent liquid crystal molecules can be easily and efficiently produced .

The method may further include a step of performing a silane treatment on the surface of the photo-curable liquid crystal polymer layer 501 after coating the photo-curable liquid crystal polymer layer 501 on the substrate 101. [ When the surface of the photo-curable liquid crystal polymer layer 501 is subjected to the silane treatment, adjacent liquid crystal molecules can be vertically aligned by the optical phase retardation film 500. The surface of the first projection line pattern 510 and the surface of the second projection line pattern 520 may be subjected to a silane treatment after the optical phase retardation film 500 is formed.

[Example 2]

A second embodiment according to the present invention will be described with reference to Figs. 6 to 8. Fig.

6 is a perspective view of a phase retarder film 600 according to a second embodiment of the present invention. 6, reference numeral 101 denotes a substrate on which a light phase retardation film is formed. 6, the optical phase retardation film 600 includes a film body portion 650 and a plurality of protrusion line patterns 610 and 620 formed on the film body portion 650. As shown in FIG.

The plurality of projected line patterns 610 and 620 have different phase differences. That is, the plurality of projection line patterns include a first projection line pattern 610 having anisotropy and a second projection line pattern 620 having isotropy. Here, the first projection line pattern 610 has a phase difference within a range larger than 0 and smaller than or equal to? / 2. Specifically, the phase difference of the first projection line pattern 610 is? / 4 or? / 4 or? / 4, depending on the type of display device in which the phase retardation film 600 is used and the position where the phase retardation film 600 is disposed. 2, and may have various retardations within a range of greater than 0 and less than or equal to? / 2, depending on the case. Further, the second projection line pattern 620 has a phase difference of zero.

6, the first protrusion line pattern 610 and the second protrusion line pattern 620 are alternately arranged, but the present invention is not limited thereto. Accordingly, the first protrusion line pattern 610 and the second protrusion line pattern 620 can be freely arranged in various shapes as needed, and the area of the first protrusion line pattern 610 in the optical phase retardation film 600 And the second projection line pattern 620 can be freely set as needed.

The optical phase retardation film 600 including the first projected line pattern 610 and the second projected line pattern 620 having different phase differences can be formed at the same time in the reflective region and the transmissive region as in the transflective liquid crystal display device It can be effectively used for an existing display device.

In addition, the plurality of projection line patterns 610 and 620 have substantially the same longitudinal direction. However, the present invention is not limited thereto. Accordingly, the plurality of projection line patterns 610 and 620 having different phase differences may be formed to have different longitudinal directions.

Further, the plurality of protrusion line patterns 610 and 620 have a liquid crystal aligning property for aligning the liquid crystal molecules to be disposed adjacent to each other. That is, the liquid crystal molecules are aligned along the grain direction of the projection line patterns 610 and 620. Therefore, the optical phase retardation film 600 according to the present invention can also function as an alignment layer. At this time, the protrusion line patterns 610 and 620 horizontally align the liquid crystal molecules structurally. However, the protruding line patterns 610 and 620 whose surfaces have been subjected to the silane treatment may vertically align the liquid crystal molecules.

Further, the optical phase retardation film 600 is made of a photo-curable liquid crystal polymer. The photo-curable liquid crystal polymer refers to a liquid crystal polymer that is cured upon irradiation with light such as ultraviolet light. As the photo-curable liquid crystal polymer, various known types which can be easily carried out by a person skilled in the art can be used.

FIGS. 7A and 7B show the result of observing the optical phase retardation film 600 disposed between a pair of polarizing plates with polarization axes crossed by an electron microscope.

7A and 7B, reference symbol AP denotes the directions of the polarization axes of the pair of polarizing plates. In addition, reference numerals A61 and A62 denote the longitudinal direction of the first projection line pattern 610 and the second projection line pattern 620. 2A and 2B, the first projection line pattern 620 has a phase difference of? / 4 and the second projection line pattern 620 has a phase difference of zero.

7A shows a state in which the longitudinal direction of the first projection line pattern 610 and the second projection line pattern 620 is inconsistent with the polarization axis directions of the pair of polarizing plates, The longitudinal direction of the two protrusion line patterns 620 coincides with one of the directions of the polarization axes of the pair of polarizing plates. FIG. 7B shows the optical phase retardation film 600 of FIG. 7A rotated by 45 degrees.

As shown in FIG. 7A, if the longitudinal direction of the first projection line pattern 610 and the second projection line pattern 620 is inconsistent with the polarization axis directions of the pair of polarizing plates, the first projection line pattern 620 having anisotropy The second protrusion line pattern 620 having light isotropy is displayed as dark because the second protrusion line pattern 620 can not pass through the light.

7B, when the longitudinal direction of the first projection line pattern 610 and the second projection line pattern 620 coincides with one of the polarization axis directions of the pair of polarizing plates, the first anisotropic first Both the protrusion line pattern 610 and the second protrusion line pattern 620 which is isotropic can not pass through the light and are darkly displayed. The first projection line pattern 610 has a phase difference of? / 4 and rotates the light linearly polarized by the polarizing plate by 90 degrees or converts it into circularly polarized light or elliptically polarized light. Accordingly, when one of the longitudinal direction of the first projection line pattern 610 and the direction of the polarization axis of the polarizer coincides with each other, the light does not pass through the polarizer again and is darkened.

8 is a graph showing the result of measuring the optical anisotropy value of the optical phase retardation film 600 of FIG. As shown in FIG. 8, the first projection line pattern 610 has a phase difference of? / 4 and the second projection line pattern 620 has a phase difference of zero.

With such a configuration, the optical phase retardation film 600 can selectively adjust the area where linearly polarized light is rotated by 90 degrees or converted into circularly polarized light or elliptically polarized light, if necessary. Therefore, the light is absorbed by the polarizer, and the decrease in the overall luminance and contrast ratio can be minimized.

In addition, since the liquid crystal aligning property for aligning adjacent liquid crystal molecules is provided, the alignment film can be also performed.

In addition, the optical phase retardation film 600 including the first projection line patterns 610 and the second projection line patterns 620 having different phase differences has a reflective region and a transmissive region inside the liquid crystal display device such as a transflective liquid crystal display device It can be used more effectively for a display device existing at the same time.

Hereinafter, a method of manufacturing the optical phase retardation film 600 of FIG. 6 according to the second embodiment of the present invention will be described with reference to FIGS. 9 to 11. FIG.

First, as shown in Fig. 9, a photo-curable liquid crystal polymer layer 601 is coated on a substrate 101. Then, Here, the coating uses a spin coating method. However, the present invention is not limited thereto, and various known coating methods can be used.

Then, the photo-curable liquid crystal polymer layer 601 is imprinted on the polymer mold 800. Here, the polymer mold 800 has a recessed line pattern 830. The recessed line pattern 830 forms the protrusion line patterns 610 and 620 of the optical retardation film 600. In addition, the polymer mold 800 is made of various resin-based materials having heat resistance and being transparent.

10, using a mask 850 to imprint the photocurable liquid crystal polymer layer 602, i.e., the photocurable liquid crystal polymer layer 602 bonded to the polymer mold 800, And irradiate ultraviolet rays which are not irradiated. That is, one region of the photo-curable liquid crystal polymer layer 602 is cured by irradiation with ultraviolet rays, and the other region is not irradiated with ultraviolet rays. At this time, since the polymer mold 800 is transparent, ultraviolet light can be freely irradiated in various directions. The mask 850 includes an opening area 852 for transmitting light and a shielding area 851 for blocking light.

Next, the photo-curable liquid crystal polymer layer 602 in which one region is exposed to ultraviolet rays is heated. More specifically, the non-cured region of the photo-curable liquid crystal polymer layer 6002 is heated to a temperature higher than the temperature at which it is isotropically transferred. Therefore, one region of the photo-curable liquid crystal polymer layer 602 exposed and cured by ultraviolet rays maintains anisotropy, and the other region receives heat in a non-cured state and is transferred to an isotropic state. The isotropic phase transition temperature of the photo-curable liquid crystal polymer layer 602 can be measured by using a measuring device such as a differential scanning calorimeter (DSC). Here, in order for other regions of the photo-curable liquid crystal polymer layer 602 to be isotropically transferred, the temperature should be at least 180 degrees Celsius.

11, when the other region of the photo-curable liquid crystal polymer layer 602 is transferred to the isotropic phase, the photo-curable liquid crystal polymer layer 602 is entirely exposed to unpolarized ultraviolet rays.

Next, when the polymer mold 800 is separated, the optical phase retardation film 600 having the first protrusion line pattern 610 and the second protrusion line pattern 620 is formed.

At this time, one region of the photo-curable liquid crystal polymer layer 602 which is selectively exposed to ultraviolet rays through the mask 800 and has anisotropy becomes the first projection line pattern 610 of the optical phase retardation film 600, Another region of the photo-curable liquid crystal polymer layer 602 isotropically transferred becomes the second projection line pattern 620 of the optical phase-retarding film. Here, the first projection line pattern 610 has a phase difference within a range greater than 0 and smaller than or equal to? / 2. The second projection line pattern 620 has a phase difference of zero.

Further, the first projection line pattern 610 can be adjusted in the manufacturing process of the optical phase retardation film so as to have a desired phase difference within a range larger than 0 and smaller than or equal to? / 2. Specifically, in the process of coating the photo-curable liquid crystal polymer layer 601 on the substrate through spin coating, the phase difference of the first projection line pattern 610 becomes closer to? / 2 as the coating rate increases. On the other hand, the higher the concentration of the photo-curable liquid crystal polymer layer 601, the closer the phase difference of the first projection line pattern 610 is to zero.

By such a manufacturing method, the optical phase retardation film 600 capable of rotating linearly polarized light by 90 degrees or converting it into circularly polarized light or elliptically polarized light and orienting adjacent liquid crystal molecules can be easily and efficiently produced .

The method may further include a step of performing a silane treatment on the surface of the photo-curable liquid crystal polymer layer after coating the photo-curable liquid crystal polymer layer on the substrate. On the other hand, after the optical phase retardation film is formed, the surfaces of the first projection line pattern and the second projection line pattern may be subjected to a silane treatment. When the surface of the photo-curable liquid crystal polymer layer is subjected to the silane treatment, adjacent liquid crystal molecules can be vertically aligned by the optical phase retardation film.

[Example 3]

A third embodiment according to the present invention will be described with reference to Fig. 12 is a schematic partial perspective view showing the structure of a display device 900 according to the third embodiment of the present invention.

12, the display device 900 includes a first substrate 100, a second substrate 200, a liquid crystal layer 300, a first polarizer 150, a second polarizer 250, 230 and a light phase retardation film 500. Here, the optical phase retardation film 500 is the same as that described in the first embodiment and the second embodiment.

The first substrate 100 includes a thin film transistor (TFT), which is a switching element, and a pixel electrode connected to the thin film transistor.

The second substrate 200 includes a common electrode. A color filter is formed on one of the first substrate 100 and the second substrate 200.

At least one of the pixel electrode of the first substrate 100 and the common electrode of the second substrate 200 may partially or wholly have a reflective region. Thus, the display device 900 becomes a transflective or reflective type. The reflective region of the electrodes may be made of a material including aluminum, silver and other reflective materials.

The liquid crystal layer 300 includes a plurality of liquid crystal molecules 301 and is disposed between the pixel electrode of the first substrate 100 and the common electrode of the second substrate 200. The liquid crystal molecules 9301 may be horizontally oriented or vertically oriented depending on the type of the display device 900. [

The first polarizing plate 150 and the second polarizing plate 250 are disposed on the outer sides of the first substrate 100 and the second substrate 200 such that their polarization axes cross each other. The first polarizing plate 150 and the second polarizing plate 250 linearly polarize the passing light.

The optical phase retardation film 500 rotates linearly polarized light by 90 degrees or converts it into circularly polarized light or elliptically polarized light, and aligns the liquid crystal molecules 301 of the liquid crystal layer together with the orientation film 230.

The optical phase retardation film 500 can selectively adjust the area where the linearly polarized light is rotated by 90 degrees or converted into circularly polarized light or elliptically polarized light, if necessary. Therefore, light can be absorbed by the polarizers 150 and 250, and the degradation of the overall brightness and contrast ratio can be minimized.

In addition, the optical phase retardation film 500 can form a multi-domain that divides one pixel into a plurality of domains by controlling the alignment directions of the liquid crystal molecules 301 of the liquid crystal layer 300 to be different from each other.

With this structure, when the thin film transistor is turned on, an electric field is formed between the pixel electrode and the common electrode. Such an electric field changes the arrangement angle of the liquid crystal molecules of the liquid crystal layer disposed between the first substrate 100 and the second substrate 200, and thus the light transmittance of each pixel is changed in the display device 900.

Also, the display device may include a light phase retardation film capable of rotating linearly polarized light by 90 degrees, converting it into circularly polarized light or elliptically polarized light, and orienting liquid crystal molecules of the liquid crystal layer, thereby improving productivity.

In addition, the display device can increase the utilization efficiency of light and reduce waste.

Further, the internal structure of the display device is not necessarily limited to those described above, and may have various structures well known to those skilled in the art.

It will be understood by those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the following claims. Will be easily understood.

1 is a perspective view of a phase retarder film according to a first embodiment of the present invention.

FIGS. 2A and 2B are views showing the optical phase retardation film of FIG. 1 observed under an electron microscope.

FIG. 3 is a graph showing an optical anisotropy value of the optical retardation film of FIG. 1 measured.

4 and 5 are a perspective view and a cross-sectional view sequentially showing the method of manufacturing the optical phase delay film of FIG.

6 is a perspective view of a phase retarder film according to a second embodiment of the present invention.

7A and 7B are views showing the optical phase retardation film of FIG. 7 observed under an electron microscope.

FIG. 8 is a graph showing an optical anisotropy value of the optical retardation film of FIG. 6 measured.

FIGS. 9 to 11 are a perspective view and a cross-sectional view sequentially showing the method of manufacturing the optical phase delay film of FIG.

12 is a partial perspective view showing a display device according to a third embodiment of the present invention.

Claims (26)

A plurality of projection line patterns made of a photo-curable liquid crystal polymer and having a phase difference within the range of 0 to? / 2, Wherein the plurality of projected line patterns have liquid crystal orientation for aligning liquid crystal molecules to be disposed adjacent to each other, The plurality of projected line patterns may include: A first projection line pattern whose longitudinal direction is a first direction, And a second projection line pattern whose longitudinal direction is a second direction different from the first direction, And the angle between the first direction and the second direction is 45 degrees. delete delete The method of claim 1, Wherein the plurality of protrusion line patterns have different phase differences. 5. The method of claim 4, The plurality of projected line patterns may include: A first projection line pattern having anisotropy, And a second projection line pattern having an isotropic phase difference of zero. The method according to any one of claims 1, 4, and 5, Wherein the long axis direction of the liquid crystal molecules to be disposed adjacent to each other is substantially parallel to the longitudinal direction of the plurality of projection line patterns in an electric field state. The method according to any one of claims 1, 4, and 5, Wherein the long axis direction of the liquid crystal molecules to be disposed adjacent to each other is substantially perpendicular to the direction of embossing of the plurality of projection line patterns in an electric field state. 8. The method of claim 7, Wherein the plurality of projected line patterns have a surface treated with a silane treatment. Coating a photocurable liquid crystal polymer layer on a substrate; Imprinting the photo-curable liquid crystal polymer layer with a polymer mold having a plurality of recessed line patterns, Irradiating the imprinted light curable liquid crystal polymer layer with unpolarized ultraviolet light, A plurality of protrusion line patterns corresponding to the recessed line patterns of the polymer mold are formed in the photo-curable liquid crystal polymer layer, The plurality of projected line patterns have a phase difference within the range of 0 to? / 2, The plurality of projected line patterns may include: A first projection line pattern whose longitudinal direction is a first direction, And a second projection line pattern whose longitudinal direction is a second direction different from the first direction, Wherein the angle between the first direction and the second direction is 45 degrees. delete delete The method of claim 9, The coating is a spin coating, The higher the speed of the coating, the closer the phase difference of the plurality of projection line patterns becomes to? / 2, And the phase difference of the plurality of projected line patterns becomes closer to 0 as the concentration of the photo-curable liquid crystal polymer layer becomes higher. Coating a photocurable liquid crystal polymer layer on a substrate; Imprinting the photo-curable liquid crystal polymer layer with a polymer mold having a recessed line pattern; Selectively irradiating un-polarized ultraviolet light to a region of the imprinted light curable liquid crystal polymer layer using a mask, And heating the photo-curable liquid crystal polymer layer exposed to ultraviolet light in one region so as to have a predetermined temperature. The method of claim 13, Further comprising the step of irradiating ultraviolet light which is not polarized as a whole to the heated photo-curable liquid crystal polymer layer. The method of claim 13, Wherein the predetermined temperature is at least 180 degrees Celsius. The method of claim 13, A protrusion line pattern corresponding to a recessed line pattern of the polymer mold is formed in the photo-curable liquid crystal polymer layer, Wherein the projection line pattern comprises a first projection line pattern corresponding to one region of the photocurable liquid crystal polymer layer selectively exposed to ultraviolet light using the mask and having anisotropy, And a second projection line pattern corresponding to another region of the photo-curable liquid crystal polymer layer and having isotropy, Wherein the first projection line pattern has a retardation within a range of greater than 0 and less than or equal to? / 2, and the second projection line pattern has a retardation of zero. 17. The method of claim 16, The coating is a spin coating, The higher the speed of the coating, the closer the phase difference of the plurality of projection line patterns becomes to? / 2, And the phase difference of the plurality of projected line patterns becomes closer to 0 as the concentration of the photo-curable liquid crystal polymer layer becomes higher. The method of claim 13, Further comprising the step of subjecting the surface of the photo-curable liquid crystal polymer layer to a silane treatment. A first substrate, A second substrate facing the first substrate, A liquid crystal layer disposed between the first substrate and the second substrate and including a plurality of liquid crystal molecules; And a light phase retardation film disposed at one or more positions between the first substrate and the liquid crystal layer and between the second substrate and the liquid crystal layer, Wherein the optical phase retardation film comprises a plurality of projection line patterns made of a photocurable liquid crystal polymer and having a retardation in the range of 0 to? / 2, Wherein the plurality of protrusion line patterns have liquid crystal orientation for orienting liquid crystal molecules of the liquid crystal layer, The plurality of projected line patterns may include: A first projection line pattern whose longitudinal direction is a first direction, And a second projection line pattern whose longitudinal direction is a second direction different from the first direction, And the piercing angle between the first direction and the second direction is 45 degrees. delete delete 20. The method of claim 19, Wherein the plurality of projection line patterns have different phase differences from each other. The method of claim 22, The plurality of projected line patterns may include: A first projection line pattern having anisotropy, And a second projection line pattern having an isotropic phase difference of zero. The method of any one of claims 19, 22, and 23, Wherein the liquid crystal molecules are horizontally oriented such that a major axis direction of the liquid crystal molecules is substantially parallel to a longitudinal direction of the plurality of projection line patterns in an electric field state. The method of any one of claims 19, 22, and 23, Wherein the liquid crystal molecules are vertically oriented so that the major axis direction of the liquid crystal molecules is substantially parallel to the direction of the rising of the plurality of projection line patterns in an electric field state. 26. The method of claim 25, Wherein the plurality of projected line patterns have their surfaces subjected to a silane treatment.

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