KR101330099B1 - Display apparatus set for forming stereoscopic - Google Patents

Abstract

The present invention relates to a display device set for stereoscopic image realization, and more particularly, a difference between an image display unit including a pattern retarder formed on one surface of a polymer base film, and a polymer base film and a front phase difference value (RO) of 50 nm or less. The present invention relates to a display apparatus for stereoscopic image display that can be made thinner and lighter in an image display unit, and can realize a clear stereoscopic image without ghosting.

Description

Display device set for stereoscopic image implementation {DISPLAY APPARATUS SET FOR FORMING STEREOSCOPIC}

The present invention relates to a display device set for stereoscopic image realization capable of reducing the thickness and weight of an image display unit and realizing a clear stereoscopic image without ghosting.

The factors that make a person feel three-dimensional are physiological and empirical factors. In general, three-dimensional image display technology uses a binocular parallax, which is the biggest factor for recognizing three-dimensional effect at a close range.

The principle of binocular parallax is a method of capturing the left eye image viewed by the viewer through the left eye and the right eye image viewed through the right eye from at least two stereoscopic image capturing cameras, and then separating them and delivering them to the viewer's eyes. . This is possible because two human eyes receive objects through the retina from different angles and these two images are synthesized in the cerebrum.

There are two methods of observing a stereoscopic image, a method of wearing glasses and a glasses-free method of not wearing glasses. The way of wearing glasses is (1) anaglyph method that uses sunglasses of colors that are distinct from each other, (2) polarization method that uses polarized glasses with different polarization directions, and (3) time-divided screen There is a time-sharing method of wearing glasses with an electronic shutter that is periodically repeated and synchronized with the period.

Such glasses systems require a display device for displaying a stereoscopic image and a device for observing a stereoscopic image in order to implement a stereoscopic image.

On the other hand, a display device for displaying a stereoscopic image using polarized glasses is often used with a pattern retarder using liquid crystals. The pattern retarder is composed of a glass substrate, an alignment film coated on the substrate and subjected to surface alignment, and a liquid crystal coated and oriented on the alignment film. The liquid crystal is surface-aligned with the photoreactive liquid crystal on the alignment film and crosslinked and solidified by light irradiation such as ultraviolet rays to form a polymer liquid crystal film. At this time, it functions as a pattern retarder in accordance with the alignment direction of the liquid crystal in accordance with the surface alignment of the alignment film.

The pattern retarder uses a glass substrate for ease of manufacturing, but in this case, there is a limitation in that a polarizing plate cannot be manufactured by a roll-to-roll process.

Thus, there has been an attempt to replace the glass substrate with a polymer substrate film, but the polymer substrate film has a large phase difference compared to the glass substrate, so that the state of light transmitted through the display is changed to elliptical polarization instead of circular polarization. When elliptically polarized light, polarization of the left eye and the polarization of the right eye cannot be sufficiently separated, thereby causing a ghost phenomenon due to cross talk in the stereoscopic image.

An object of the present invention is to provide a display device set for stereoscopic image implementation that can implement a clear stereoscopic image without ghosting caused by cross talk.

In addition, the present invention is to provide a display device set for implementing a three-dimensional image that can be reduced in thickness and weight of the image display unit.

1. An image display unit including a pattern retarder formed on one surface of a polymer base film, and a display device for realizing a stereoscopic image including a polarizing glasses including a polymer phase film and a first phase difference film having a difference in frontal retardation value (RO) of 50 nm or less. set.

2. In the above 1, wherein the first retardation film is a difference between the polymer base film and the front phase retardation value (RO) is 30nm or less display device set for implementing the image.

3. In the above 1, wherein the polymer base film and the first retardation film is a three-dimensional image display device set that the slow axis is perpendicular to each other.

4. In the above 1, wherein the polymer base film and the first retardation film, each of the front retardation value (RO) is 5nm or more display device set for implementing the image.

5. In the above 1, the polymer base film and the first retardation film, respectively, polyolefin resin, polyester resin, cellulose resin, polycarbonate resin, acrylic resin, styrene resin, vinyl chloride resin, amide resin , Imide resin, polyether sulfone resin, sulfone resin, polyether sulfone resin, polyether ether ketone resin, polyphenylene sulfide resin, vinyl alcohol resin, vinylidene chloride resin, vinyl butyral resin, A display device set for stereoscopic image realization, which is selected from the group consisting of allyl resin, polyoxymethylene resin and epoxy resin.

6. In the above 1, wherein the polarizing glasses further comprises a second retardation film for the linear polarization direction of the image passing through the polarizer and the image display unit stereoscopic image display device set.

7. In the above 6, wherein the polarizing glasses are stacked in the order of the first retardation film, the second retardation film and the polarizer display device set for realizing the image.

8. In the above 6, wherein the polarizing glasses are stacked in the order of the second retardation film, the first retardation film and the polarizer display device set for stereoscopic image.

Since the display device set for implementing a stereoscopic image of the present invention includes a pattern retarder formed on a polymer base film, it is possible to reduce the thickness and weight of an image display unit.

In addition, the display device set for implementing a stereoscopic image of the present invention can implement a clear stereoscopic image without a ghost phenomenon due to cross talk.

1 is a cross-sectional view of a display device set for implementing a stereoscopic image according to Embodiment 1 of the present invention.
2 briefly illustrates a principle of confirming stereoscopic images of a display device set for stereoscopic image implementation according to Embodiment 1 of the present invention.
3 is a cross-sectional view of a display device set for implementing a stereoscopic image according to Embodiment 2 of the present invention.
4 is a view briefly illustrating a principle capable of confirming a stereoscopic image of a display device set for stereoscopic image implementation according to Embodiment 2 of the present invention.
5 is a cross-sectional view of a display device set for implementing a stereoscopic image according to Embodiment 3 of the present invention.
6 is a view briefly illustrating a principle capable of confirming a stereoscopic image of a display device set for stereoscopic image implementation according to Embodiment 3 of the present invention.
7 is a cross-sectional view of a display device set for implementing stereoscopic images according to Embodiment 4 of the present invention.
8 is a view briefly illustrating a principle capable of confirming a stereoscopic image of a display device set for stereoscopic image implementation according to Embodiment 4 of the present invention.
9 is a cross-sectional view of a display device set for implementing a stereoscopic image according to Embodiment 5 of the present invention.
FIG. 10 briefly illustrates a principle capable of confirming a stereoscopic image of a display device set for stereoscopic image implementation according to Embodiment 5 of the present invention.
11 is a cross-sectional view of a display device set for implementing a stereoscopic image according to Embodiment 6 of the present invention.
12 is a view briefly illustrating a principle capable of confirming a stereoscopic image of a display device set for stereoscopic image implementation according to Embodiment 6 of the present invention.
13 is a cross-sectional view of a display device set for implementing a stereoscopic image according to a comparative example of the present invention;
14 is a view briefly illustrating a principle capable of confirming a stereoscopic image of a display device set for implementing a stereoscopic image according to a comparative example of the present invention.

The present invention relates to a display device set for stereoscopic image realization capable of reducing the thickness and weight of an image display unit and realizing a clear stereoscopic image without ghosting.

Hereinafter, the present invention will be described in detail.

The display device set for implementing a stereoscopic image according to the present invention includes an image display unit including a pattern retarder formed on one surface of a polymer base film, and a polarization including a first retardation film having a difference of 50 nm or less from a polymer base film and a front phase difference value (RO). Made of glasses.

In addition, the polymer base film and the first retardation film are disposed such that each slow axis is perpendicular to each other.

The image display unit is configured of a polarizing plate including a pattern retarder to enable a stereoscopic image. At this time, the polarizing plate is bonded to the upper plate of the liquid crystal cell.

In general, the pattern retarder uses a glass substrate having a front phase difference value (RO) of 5 nm or less and disordered axial direction to realize a clear stereoscopic image. However, the glass substrate requires a certain thickness and weight, and there is a problem in that it is not easy to apply to a roll-to-roll process which is useful for manufacturing a polarizing plate.

The present invention uses a polymer substrate film instead of a glass substrate, and includes a specific first phase difference film in the polarizing glasses that can compensate for phase difference modulation of the image by the polymer substrate film.

The polymer base film has a larger front retardation value than the glass substrate to change the circularly polarized light passed through the pattern retarder into elliptical polarized light. When elliptically polarized, the left eye polarization and the right eye polarization cannot be separated sufficiently, resulting in a ghost phenomenon. The first retardation film serves to circularly polarize the elliptical polarization before being linearly polarized in the polarizing glasses.

The first retardation film is laminated so that the difference between the polymer base film and the front retardation value RO is 50 nm or less, preferably 30 nm or less, and the slow axes are perpendicular to each other.

For example, when viewed from the direction in which the polarizer layer is disposed, the slow axis of the polymer base film is 0 ° clockwise and the slow axis of the first retardation film is 90 °.

In addition, as an example, when viewed from the direction in which the polarizer layer is disposed, the slow axis of the polymer base film is 45 ° clockwise and the slow axis of the first retardation film is -45 °.

The polymer base film and the first retardation film have a front retardation value (RO) of 5 nm or more, specifically 5 to 300 nm, preferably 5 to 50 nm.

The polymer base film and the first retardation film are not particularly limited, and a film excellent in transparency, mechanical strength, thermal stability, moisture shielding, retardation uniformity, and isotropy can be used.

Specifically, polyolefin resin, polyester resin, cellulose resin, polycarbonate resin, acrylic resin, styrene resin, vinyl chloride resin, amide resin, imide resin, polyether sulfone resin, sulfone resin, Polyether sulfone resin, polyether ether ketone resin, polyphenylene sulfide resin, vinyl alcohol resin, vinylidene chloride resin, vinyl butyral resin, allylate resin, polyoxymethylene resin and epoxy resin One selected from the group consisting of can be used.

The polymer base film and the first retardation film may each have a thickness of 5 to 100 μm, preferably 15 to 60 μm. If the thickness is less than 5㎛ the mechanical strength is difficult to control difficult, if it exceeds 100㎛ there is a problem that the thin film is not easy.

An exemplary display device set according to the present invention includes a polarizing plate laminated in the order of a protective film, a polarizer, a pattern retarder, and a polymer base film in an image display unit. The polarizing glasses include a first retardation film for compensating for phase difference modulation of the polymer base film, a second retardation film and a polarizer for linearly polarizing the polarization of the image passing through the first retardation film, respectively.

In addition, the exemplary display device set according to the present invention includes a polarizing plate laminated in the image display unit in the order of a protective film, a polarizer, a polymer base film, and a pattern retarder. The polarizing glasses include a first retardation film for compensating for phase difference modulation of the polymer base film, a second retardation film and a polarizer for linearly polarizing the polarization of the image passing through the first retardation film, respectively.

In addition, the exemplary display device set according to the present invention includes a polarizing plate laminated in the image display unit in order of a protective film, a polarizer, a pattern retarder, and a polymer base film. The polarizing glasses have a second retardation film for linearly polarizing a circularly polarized image on the left and a right, and a first retardation film for compensating for phase difference modulation of the polymer base film to compensate for an image that is not completely linearly polarized through the second retardation film. , And a polarizer.

Usually, the polarizing plate included in the image display unit is bonded to the upper plate of the liquid crystal cell, and the lower plate may use a polarizing plate generally used in the art. For example, a polarizing plate having a structure in which a protective film is bonded to both surfaces of the polarizer may be used.

The configuration of the image display unit and the polarizing glasses will be described in more detail as follows.

The polarizers included in the image display unit and the polarizing glasses are generally used in the art and are not particularly limited as long as they can perform the polarizing function. Specifically, stretched polyvinyl alcohol, wire grid, carbon nanotube, etc. using a dichroic compound may be used.

Among these, the stretched polarizer of which the form-type polarizer is easy to process into a film form is a dichroic dye adsorbed and oriented to the stretched polyvinyl alcohol-based film. The polyvinyl alcohol-based resin constituting the polarizer can be produced by saponifying a polyvinyl acetate-based resin.

As an example of polyvinyl acetate type resin, the copolymer etc. with vinyl acetate and the other monomer copolymerizable with this besides the polyvinyl acetate which is a homopolymer of vinyl acetate are mentioned. Specific examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, unsaturated sulfonic acids, olefins, vinyl ethers, acrylamides having an ammonium group, and the like. In addition, the polyvinyl alcohol-based resin may be modified, for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The degree of saponification of the polyvinyl alcohol-based resin may be 85 to 100 mol%, preferably 98 mol% or more. In addition, the degree of polymerization of the polyvinyl alcohol-based resin is usually 1,000 to 10,000, preferably 1,500 to 5,000.

The protective film is a generic term for a film for protecting it because the polarizer is mechanically weak, and when the retardation film performs the role of the polarizer protective film, the retardation film is also regarded as belonging to the protective film of the present invention.

In addition, in the present invention, a protective film may be bonded between the polarizer and the polymer base film, and may be bonded to one side or both sides of the polarizer of the polarizing glasses. For example, the protective film may be selected from the group consisting of polyester resins, acrylic resins, polyolefin resins, and norbornene resins.

The pattern retarder is composed of retardation layers arranged so that two or more distinct areas have different phases or slow axis directions. Generally, the pattern retarder is formed on a glass plate having a very low phase difference such as a glass substrate. In the present invention, the pattern retarder is formed on the polymer base film. Specifically, the pattern retarder includes a polymer base film and a liquid crystal coating layer. In the application of the present invention, the pattern retarder generally used in the art may be applied to a form that may constitute a pattern retarder, for example, a film retarder in a film form, a pattern retarder from which an alignment layer is removed, and the like, but is not particularly limited thereto. .

An example alignment film according to the present invention is formed on a polymer base film.

The alignment layer is generally used in the art and is not particularly limited, but an organic alignment layer is preferably used.

The organic alignment film is formed using an alignment film composition containing an acrylate-based, polyimide-based or polyamic acid. The polyamic acid is a polymer obtained by reacting diamine and dianhydride, and the polyimide is obtained by imidating the polyamic acid, and their structure is not particularly limited.

It is important to maintain an appropriate viscosity of the alignment film composition. When the viscosity is too high, it is difficult to form an alignment film having a uniform thickness because it does not easily flow even when pressure is applied. When the viscosity is too low, the spreadability is good, but it is difficult to control the thickness of the alignment film. For example, it is preferable that it is 8-13 cP.

In addition, it is good to consider the surface tension, the solid content and the volatility of the solvent. In particular, since the content of solid content affects the viscosity and surface tension, it is good to adjust the thickness and curing characteristics of the alignment film in consideration of the same.

If the solid content is too high, the viscosity is high, the thickness of the alignment film is thick, if it is too low, there is a problem that a high proportion of the solvent causes a stain after drying the solution. For example, it is preferable that content of solid content is 0.1 to 10 weight%.

The alignment film composition is preferably in the form of a solution in which solid content such as acrylate, polyimide, or polyamic acid is dissolved in a solvent. The solvent is not particularly limited as long as it can dissolve the solid content. Specifically, butyl cellosolve, gamma-butyrolactone, N-methyl-2-pyrrolidone, dipropylene glycol monomethyl ether, or the like may be used.

Such solvents are suitably mixed so as to form a uniform alignment film in consideration of solubility, viscosity, surface tension, and the like.

In addition to the alignment layer composition, a crosslinking agent and a coupling agent may be further mixed to form an effective alignment layer.

The alignment film is prepared by applying the alignment film composition to one side of the polymer base film.

The application is not particularly limited as long as it is a method commonly used in the art. For example, the coating may be applied to the alignment film composition by flow casting and air knife, gravure, reverse roll, kiss roll, spray or blade, or the like. It can be formed by applying directly in a suitable development method using the method.

In order to improve the coating efficiency of the alignment film composition, a drying process may be further performed.

Drying is not particularly limited and can be generally carried out using a hot air dryer or a far infrared heater, and the drying temperature is usually 30 to 100 ° C, preferably 50 to 80 ° C, and the drying time is usually 30 to 600 seconds, preferably It is preferable that it is 120 to 600 seconds.

Orientation is provided to the alignment film formed after this. Orientation provision methods include a rubbing method, a photo-alignment method and the like, and is not particularly limited.

For example, after providing the entire alignment property to the formed alignment film, the alignment film patterned to have different alignment directions may be manufactured by an exposure process using a photo mask. In addition, after performing the first exposure process by aligning the first photo mask having the light transmitting portion and the light blocking portion on the formed alignment layer, the second photo mask in which the positions of the light transmitting portion and the light blocking portion of the first photo mask are reversed is aligned. The exposure process may be performed to fabricate an alignment film patterned to have different optical axes.

The light used for the exposure is not particularly limited, but for example, polarized ultraviolet irradiation, ion beam or plasma beam irradiation, radiation irradiation, or the like can be used. For example, it is preferable to irradiate polarized ultraviolet rays.

A liquid crystal coating layer is formed on the oriented alignment film.

The liquid crystal coating layer is formed by applying a composition for liquid crystal coating onto a patterned alignment film.

The liquid crystal coating composition may have optical anisotropy, and may include and use a liquid crystal compound having crosslinkability by light. For example, it is preferable to use a reactive liquid crystal monomer (RM).

The reactive liquid crystal monomer refers to a monomer molecule having a liquid crystal phase including a mesogen capable of expressing liquid crystal and a terminal group capable of polymerization. By polymerizing the reactive liquid crystal monomer, it is possible to obtain a crosslinked polymer network while maintaining the aligned phase of the liquid crystal. When the reactive liquid crystal monomer molecules are cooled from the clearing point, a large area domain having a structure that is better oriented at a relatively low viscosity in the liquid crystal phase may be obtained than when a liquid crystal polymer having the same structure is used.

The large area liquid crystal crosslinked network film thus formed is mechanically and thermally stable because it has a solid thin film form while maintaining properties such as optical anisotropy and dielectric constant of the liquid crystal.

The liquid crystal coating composition is diluted and used in a solvent in order to ensure the efficiency of the coating process and the uniformity of the coating layer, preferably, it is preferably dissolved in a solvent capable of dissolving the liquid crystal compound.

For example, the reactive liquid crystal monomer may be a liquid crystal using one or two or more kinds of solvents specifically selected from propylene glycol monomethyl ether acetate (PGMEA), methyl ethyl ketone (MEK), xylene, and chloroform. The coating composition is prepared.

At this time, the content of the reactive liquid crystal monomer in the liquid crystal coating composition is to maintain 15 to 30% by weight. If the concentration is less than 15% by weight, it is impossible to realize retardation, and when the concentration exceeds 30% by weight, reactive liquid crystal monomers are precipitated, making it difficult to form a uniform liquid crystal coating layer.

The coating method is not particularly limited, but specifically, pin coating, roll coating, dispensing coating, or gravure coating may be used. It is desirable to determine the type and amount of solvent depending on the coating method.

The liquid crystal coating layer is applied to have a thickness of 0.01 to 10 μm after drying. It is possible to easily form a uniform pattern retarder in the thickness range.

The solvent is evaporated through the drying process.

Drying is not particularly limited and can be generally carried out using a hot air dryer or a far infrared heater, and the drying temperature is usually 30 to 100 ° C, preferably 50 to 80 ° C, and the drying time is usually 30 to 600 seconds, preferably It is preferable that it is 120 to 600 seconds. In addition, drying may be carried out at the same temperature conditions, or may be performed while raising the temperature step by step.

The liquid crystal coating layer formed on the alignment film is photocrosslinked to form a patterned retarder. Light is not specifically limited, For example, an ultraviolet-ray etc. can be used.

The second retardation film is commonly used in the art, and is the same as the material and thickness of the polymer base film and the first retardation film.

The image display unit of the display device set according to the present invention may further include a surface treatment layer such as a hard coat layer, an antireflection layer or an anti-stick layer, a diffusion layer, an anti-glare layer, etc. without departing from the object of the present invention.

The hard coat treatment is performed to prevent damage to the surface of the polarizing plate, for example, a cured coating film having excellent hardness, sliding properties, etc. formed by a system for adding a suitable ultraviolet curable resin such as a silicone resin to the surface of the protective film. have. In addition, the antireflection layer is performed for the purpose of preventing external light from being reflected from the surface of the polarizing plate. The antireflective layer can be achieved by forming an antireflective film according to the prior art. It is also carried out for the purpose of preventing the protective film from being in close contact with the adjacent layer. In addition, the anti-glare layer is performed to prevent visual perception of light transmitted through the polarizer from being inhibited by external light reflected from the surface of the polarizing plate, for example, a roughening system or transparent particle mixture using sand blasting, embossing, or the like. By the system or the like, a fine roughness structure can be imparted to the surface of the protective film. Transparent particles have an average particle size of 0.5 to 20㎛, specific examples include particles made of silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide and the like. In addition, the transparent particles may use inorganic fine particles having conductivity or organic fine particles made of a crosslinked or uncrosslinked granular polymer or the like. The transparent particles are 2 to 70 parts by weight, preferably 5 to 50 parts by weight with respect to 100 parts by weight of the resin. The anti-glare layer containing the transparent fine particles may be provided as the protective film itself or as a coating layer applied to the surface of the protective film. The anti-glare layer can also function as a diffusion layer (viewing angle compensation function, etc.) that expands the viewing angle by diffusing light transmitted through the polarizing plate.

The image display portion of the display device set according to the present invention is preferably a liquid crystal display device for stereoscopic image implementation.

It will be apparent to 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 present invention. Such variations and modifications are intended to be within the scope of the appended claims.

Example 1

An image display unit laminated in the order of an adhesive layer, a triacetyl cellulose (TAC) protective film, a polarizer, a pattern retarder, and a polymer base film as shown in FIG. 1; A display device set for stereoscopic image was manufactured by including polarizing glasses stacked in the order of the first retardation film, the second retardation film, and the polarizer.

In the polymer base film and the first retardation film, when the front retardation values each have a phase difference as shown in Table 1 below in the direction in which the polarizer layer on the image display side is arranged, the slow axis of the polymer base film is 0 ° clockwise and The slow axis of one retardation film was comprised so that it might become perpendicular to each other at 90 degrees. In polarized glasses, the above angle is formed by a display device for effectively observing an image, an image display unit, and polarized glasses. Generally, the glasses wearing direction when the glasses are worn (the left eye filter and the right eye filter are horizontal to the left and right, respectively). The horizontal direction of the display device screen is parallel.

In the present invention, the relative positions of the polarizing glasses, the polarizers of the image display unit, and the slow axis and the fast axis of each film are all based on this.

The pattern retarders were arranged so that the orientation directions were perpendicular to each other and oriented in the directions of 45 ° clockwise and 45 ° counterclockwise, respectively, with respect to the polarizer. The image display part thus prepared was attached to the liquid crystal display device from which the upper polarizing plate was removed, thereby producing an image display part.

Further, in order to observe the image display unit, a polarizer, a polarizing glasses, to which the λ / 4 second retardation film and the first retardation film were bonded, respectively, were prepared in a direction shifted by 45 ° clockwise and 45 ° counterclockwise, respectively. .

The presence or absence of the ghost phenomenon observed using the manufactured stereoscopic image display device set is shown in Table 1 below.

[How to check the ghost phenomenon]

◎: Very much generated ○: Generated △: Normal Ⅹ: Not generated

Polymer Base Film First retardation film 10 nm 30 nm 60nm 80 nm 110 nm 150 nm 200 nm 0nm X X ○ ○ ◎ ◎ ◎ 10 nm X X △ ○ ◎ ◎ ◎ 20 nm X X △ △ ○ ◎ ◎ 50nm X X X X ○ ◎ ◎ 80 nm ○ △ X X X ○ ◎ 100 nm ○ ○ △ X X △ ◎ 110 nm ○ ○ △ X X △ ○ 140 nm ◎ ◎ ○ ○ X X ○ 150 nm ◎ ◎ ○ ○ △ X △ 200 nm ◎ ◎ ◎ ◎ ○ △ △

As shown in Table 1, when the first retardation film having a difference of 50 nm or less from the polymer base film and the front phase retardation value (RO), it was confirmed that the occurrence of ghost phenomenon is significantly low.

FIG. 2 shows the principle of confirming stereoscopic images of the stereoscopic image display device set manufactured in Example 1. FIG. 2 indicates the transmission axis of the polarizer, the pattern retarder, and the slow axis of the first and second retardation films.

Specifically, the image changes to linearly polarized light while passing through the polarizer, and the linearly polarized light is changed to circularly polarized light while passing through the pattern retarder. At this time, the left eye image and the right eye image have opposite directions of circularly polarized light.

The circularly polarized light is changed into elliptical polarization while passing through the polymer substrate film, and the elliptical polarized light is changed into circularly polarized light by retardation modulation compensated by the first retardation film in polarized glasses.

The circularly polarized light becomes linearly polarized light while passing through the second retardation film. At this time, the left eye and the right eye are respectively incident linearly polarized light perpendicular to each other, but polarized light coinciding with the transmission axis of the polarizer is incident and polarized light that is not coincided is blocked to implement a stereoscopic image.

Example 2

In the same manner as in Example 1, but using a polarizing glasses stacked in the order of the second retardation film, the first retardation film and the polarizer as shown in FIG.

At this time, the front surface retardation value of the polymer base film and the first retardation film were configured as shown in Table 1, respectively. The occurrence of the ghost phenomenon showed similar results as in Example 1.

4 shows the principle of confirming stereoscopic images of the stereoscopic image display device set manufactured in Example 2. FIG. The arrow direction of FIG. 4 shows the transmission axis of a polarizer, the pattern retarder, and the slow axis of a retardation film.

Specifically, the image changes to linearly polarized light while passing through the polarizer, and the linearly polarized light is changed to circularly polarized light while passing through the pattern retarder. At this time, the left eye image and the right eye image have opposite directions of circularly polarized light.

The circularly polarized light is changed into elliptical polarization while passing through the polymer base film, and the elliptical polarized light is changed into elliptical polarization through the second retardation film in polarized glasses.

The elliptical polarized light passes through the first retardation film, thereby compensating for phase difference modulation to become linearly polarized light. At this time, the left eye and the right eye are respectively incident linearly polarized light perpendicular to each other, but polarized light coinciding with the transmission axis of the polarizer is incident and polarized light that is not coincided is blocked to implement a stereoscopic image.

Example 3

In the same manner as in Example 1, the polymer base film and the first retardation film has a front phase difference value as shown in Table 2, respectively, when viewed from the direction in which the polarizer layer on the image display side of the ground of the polymer base film The axis was 45 ° clockwise and the slow axis of the first retardation film was -45 ° to be perpendicular to each other to produce a stereoscopic image display device set (FIG. 5).

The principle of confirming the stereoscopic image of the stereoscopic image display device set manufactured above is the same as that of the first embodiment. However, as shown in FIG. 6, the direction of the slow axis of the polymer base film and the slow axis of the first retardation film is 45 ° and −45 ° in the clockwise direction when viewed in the direction in which the polarizer on the image display unit is arranged.

The presence or absence of ghost phenomenon observed using the manufactured stereoscopic image display device set is shown in Table 2 below.

Polymer Base Film First retardation film 10 nm 30 nm 60nm 0nm X X X 10 nm X X △ 20 nm X X △ 50nm △ X X 80 nm ○ △ X 100 nm ○ ○ △

As shown in Table 2, when the first retardation film having a difference of 50 nm or less from the polymer base film and the front phase retardation value (RO), it was confirmed that the occurrence of ghost phenomenon is significantly low.

Example 4

In the same manner as in Example 2, the slow axis of the polymer base film is 45 ° clockwise and the slow axis of the first retardation film is perpendicular to each other at -45 ° when viewed from the direction in which the polarizer layer on the image display side is disposed. The stereoscopic image display device set was manufactured (FIG. 7).

At this time, the front surface retardation value of the polymer base film and the first retardation film were configured as shown in Table 2, respectively. The occurrence of the ghost phenomenon showed similar results as in Example 3.

The principle of confirming the stereoscopic image of the stereoscopic image display device set manufactured above is the same as that of the second embodiment. However, as shown in FIG. 8, the direction of the slow axis of the polymer base film and the slow axis of the retardation film is 45 ° and -45 ° in the clockwise direction, respectively, when viewed from the direction in which the polarizer on the image display side is disposed.

Example 5

In the same manner as in Example 1, the polymer base film and the first retardation film is the front phase difference value is configured as shown in Table 3, respectively, the pressure-sensitive adhesive layer, triacetyl cellulose (TAC) protective film, polarizer, polymer base film, A stereoscopic image display device set was manufactured using image display portions stacked in the order of the pattern retarder and the retardation film (FIG. 9).

The presence or absence of ghost phenomenon observed using the manufactured stereoscopic image display device set is shown in Table 3 below.

Polymer Base Film First retardation film 10 nm 30 nm 60nm 0nm X X X 10 nm X X △ 20 nm X X △ 50nm △ X X 80 nm ○ △ X 100 nm ○ ○ △

As shown in Table 3, when the first retardation film having a difference of 50 nm or less from the polymer base film and the front phase retardation value (RO), it was confirmed that the occurrence of ghost phenomenon is significantly low.

FIG. 10 shows the principle of confirming stereoscopic images of the stereoscopic image display apparatus set manufactured in Example 5. FIG. The arrow direction of FIG. 10 shows the transmission axis of a polarizer, the pattern retarder, and the slow axis of a 1st and 2nd phase difference film.

Specifically, the image is changed into linearly polarized light while passing through the polarizer, and the linearly polarized light is changed to elliptical polarization while passing through the polymer base film. As the elliptical polarization passes through the pattern retarder, the elliptical polarization of the left eye image and the right eye image is changed in opposite directions.

The elliptical polarization is changed to circular polarization by retardation modulation compensated by the first retardation film in polarizing glasses.

The circularly polarized light becomes linearly polarized light while passing through the second retardation film. At this time, the left eye and the right eye are respectively incident linearly polarized light perpendicular to each other, but polarized light coinciding with the transmission axis of the polarizer is incident and polarized light that is not coincided is blocked to implement a stereoscopic image.

Example 6

In the same manner as in Example 1, using an image display unit laminated in the order of an adhesive layer, a triacetyl cellulose (TAC) protective film, a polarizer, a polymer base film, a pattern retarder and a retardation film, the second retardation film, A display device set for stereoscopic image realization was manufactured using polarizing glasses stacked in the order of the first retardation film and the polarizer (FIG. 11).

At this time, the front surface retardation value of the polymer base film and the first retardation film were configured as shown in Table 3, respectively. The occurrence of the ghost phenomenon showed similar results to Example 5.

12 shows the principle of confirming stereoscopic images of the stereoscopic image display apparatus set manufactured in Example 6. FIG. The arrow direction of FIG. 12 shows the transmission axis of a polarizer, the pattern retarder, and the slow axis of a 1st and 2nd phase difference film.

Specifically, the image is changed into linearly polarized light while passing through the polarizer, and the linearly polarized light is changed to elliptical polarization while passing through the polymer base film. As the elliptical polarization passes through the pattern retarder, the elliptical polarization of the left eye image and the right eye image is changed in opposite directions.

The elliptical polarization passes through the second retardation film in polarized glasses and is changed into elliptical polarization.

The elliptical polarized light passes through the first retardation film, thereby compensating for phase difference modulation to become linearly polarized light. At this time, the left eye and the right eye are respectively incident linearly polarized light perpendicular to each other, but polarized light coinciding with the transmission axis of the polarizer is incident and polarized light that is not coincided is blocked to implement a stereoscopic image.

Comparative Example

A stereoscopic image display apparatus was manufactured in the same manner as in Example 1, using a polarizing plate for stereoscopic image formation, in which a pressure-sensitive adhesive layer, a triacetyl cellulose (TAC) protective film, a polarizer, a pattern retarder, and a polymer base film were laminated in this order. (FIG. 13). The polymer base film was changed to have a front retardation value (RO) of 80 nm, 100 nm, 110 nm, 140 nm, 150 nm, and 200 nm to produce polarizing plates for stereoscopic image formation. At this time, only the second retardation film was used as the polarizing glasses.

As a result of observing the prepared display device for stereoscopic image using the polarizing glasses of the comparative example, it was confirmed that the ghost phenomenon became stronger as the front retardation value (RO) of the polymer base film increased from 80 nm to 200 nm.

14 shows the principle of confirming stereoscopic images of the stereoscopic image display device set manufactured in the comparative example. The arrow direction of FIG. 14 shows the transmission axis of a polarizer, the slow axis of a pattern retarder, and a retardation film.

Specifically, the image changes to linearly polarized light while passing through the polarizer, and the linearly polarized light becomes circularly polarized light while passing through the pattern retarder. At this time, the circularly polarized light of the left eye image and the right eye image are opposite in direction.

The circularly polarized light passes through the polymer base film layer and a phase change occurs from circularly polarized light to elliptical polarization, and due to this change, the circularly polarized light is converted into an image having a phase of some elliptical polarization without being changed to linearly polarized light. As a result, in the function of blocking polarization that does not coincide with the polarizer of the polarizing glasses, a part is not blocked and the left eye image and the right eye image respectively leak into the right eye and the left eye. As a result, it was confirmed that a ghost phenomenon occurs due to the leaking light that is disturbed in the feeling of three-dimensional feeling, resulting in deterioration of the quality of the three-dimensional image.

10, 11: transmission axis of polarizer
20, 21: slow axis of the pattern retarder
30, 31: slow axis of the polymer base film
40, 41: slow axis of the first retardation film
50, 51: slow axis of the second retardation film
60, 61: transmission axis of polarizer of polarizing glasses

Claims (8)

An image display unit including a pattern retarder formed on one surface of the polymer base film;
A display device set for stereoscopic image display, comprising a polarizing glasses comprising a first retardation film having a difference between a polymer base film and a front retardation value (RO) of 50 nm or less.
The display device set of claim 1, wherein the first retardation film has a difference of 30 nm or less from the polymer base film and the front retardation value RO.
The display device set of claim 1, wherein the polymer base film and the first retardation film have respective slow axes perpendicular to each other.
The display device set of claim 1, wherein each of the polymer base film and the first retardation film has a front retardation value (RO) of 5 nm or more.
The method of claim 1, wherein the polymer base film and the first retardation film are polyolefin resin, polyester resin, cellulose resin, polycarbonate resin, acrylic resin, styrene resin, vinyl chloride resin, amide resin, DE resin, polyether sulfone resin, sulfone resin, polyether sulfone resin, polyether ether ketone resin, polyphenylene sulfide resin, vinyl alcohol resin, vinylidene chloride resin, vinyl butyral resin, allylate A display device set for stereoscopic image realization, selected from the group consisting of resins, polyoxymethylene resins, and epoxy resins.
The display device set of claim 1, further comprising a second retardation film for linearly polarizing the polarization direction of the image passing through the polarizer and the image display unit.
The display device set of claim 6, wherein the polarizing glasses are stacked in the order of the first retardation film, the second retardation film, and the polarizer.
The display device set of claim 6, wherein the polarizing glasses are stacked in the order of the second retardation film, the first retardation film, and the polarizer.

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