WO2012005455A2

WO2012005455A2 - Polarizing glasses

Info

Publication number: WO2012005455A2
Application number: PCT/KR2011/004476
Authority: WO
Inventors: 김봉춘; 최봉진; 김용환
Original assignee: 동우화인켐 주식회사
Priority date: 2010-07-09
Filing date: 2011-06-20
Publication date: 2012-01-12
Also published as: KR20120005711A; TW201202783A; WO2012005455A3

Abstract

The present invention relates to polarizing glasses, and more specifically, to polarizing glasses comprising: a λ/4 phase difference layer for transforming circularly polarized light into linearly polarized light; an auxiliary phase difference layer having specific optical characteristics for transforming the light which is not linearly polarized by the λ/4 phase difference layer into linearly polarized light; and a polarizer for passing the light emitted from the auxiliary phase difference layer. The polarizing glasses transform the circularly polarized light received through an inclined plane into linearly polarized light in known polarizing glasses, thereby improving known cross torque due to light leakage (simultaneous incidence of left and right lights into one side).

Description

Polarized glasses

The present invention relates to a polarizing glasses that can improve cross talk caused by light leaking from the inclined surface (simultaneous incident of left and right light incident on one side).

In general, the eyes of a person are about 65 mm apart so that when looking at an object, each eye sees a slightly different side of the object. As a way of recognizing this, there is a slight difference between the shape of an object seen after covering one eye with a palm and the object seen after covering another.

This is called disparity due to the left and right binocular. This difference is synthesized in the brain and perceived as a three-dimensional image. This principle is the basic principle applied to stereoscopic image reproduction.

The stereoscopic image display device emits circularly polarized light by placing a patterned [lambda] / 4 retardation layer on the polarizer of the upper polarizing plate. Circularly polarized light is linearly polarized in polarized glasses to recognize stereoscopic images. Polarizing glasses are composed of a λ / 4 retardation layer and a polarizer, respectively, on the left and right.

Left circular polarization and right circular polarization light incident from the front of the polarizing glasses are converted into linearly polarized light so that the images of the left and right eyes are separated. However, the left and right polarized light incident in a direction not perpendicular to the spectacle surface is converted into elliptical polarized light so that the right elliptical polarized light is incident on both the right and left eyes, or the left elliptical polarized light is on the left and right eyes Light leakage incident on all is generated. There is a problem that crosstalk phenomenon in which the left and right phases are not properly separated by the light leakage occurs.

An object of the present invention is to provide a polarizing glasses that can improve the light leakage incident to the left and right light simultaneously on one side by converting the elliptical polarized light incident in a direction not perpendicular to the spectacle surface.

In addition, an object of the present invention is to provide a polarizing glasses that can improve the crosstalk phenomenon caused by the light leakage.

1. lambda / 4 retardation layer for converting light of circular polarization into linearly polarized light, auxiliary retardation layer for converting light not linearly polarized by the λ / 4 retardation layer, and light emitted from the auxiliary retardation layer And a polarizer through which the auxiliary retardation layer has optical properties of -0.5 <NZ <1 and 50nm <RO <300nm.

2. In the above 1, wherein the auxiliary retardation layer is 0≤NZ <1, 100nm <RO <250nm polarized glasses.

3. In the above 2, wherein the slow axis of the auxiliary retardation layer is disposed in parallel or perpendicular to the transmission axis of the polarizer.

4. In the above 1, wherein the λ / 4 retardation layer is a liquid crystal coating or by the stretching of the film polarized glasses.

5. In the above 4, wherein the liquid crystal coating layer is a polarizing glasses containing a reactive liquid crystal compound (RM).

6. In the above 1, the polarizing glasses bonded to the transparent protective film on either side of the polarizer.

The polarizing glasses of the present invention can improve cross talk caused by an image signal incident in a direction not perpendicular to the spectacle surface, thereby enabling a clear three-dimensional image.

In addition, the present invention is within the range of the viewing angle of the eye (about 90 ° left and right, about 45 ° up and down), the light of circular polarized light incident from the front and inclined plane of the polarizing glasses is converted into linearly polarized light so that the generation of crosstalk is improved. Compared to a clear three-dimensional image can be viewed.

1 and 2 is a structure of a polarizing glasses according to the present invention,

3 to 9 are light measured in a black state after the light of circular polarized light incident in all directions with respect to the spectacle surface passes through each polarizing glasses prepared in Examples 1 to 5 and Comparative Examples 1 to 3; The visibility of is also the transmittance.

[Description of the code]

10: lambda / 4 phase difference layer 11: slow axis of the lambda / 4 phase difference layer

20: auxiliary retardation layer 21: slow axis of the auxiliary retardation layer

30: polarizer 31: transmission axis of the polarizer

40: transparent protective film

The present invention provides a lambda / 4 phase difference layer for converting light of circularly polarized light into linearly polarized light, an auxiliary phase difference layer having a specific optical characteristic for converting light not linearly polarized by the lambda / 4 phase difference layer into linear polarization and the auxiliary By including a polarizer for passing the light emitted from the retardation layer, by converting the light of the elliptical polarization incident in a direction not perpendicular to the conventional spectacle surface into linearly polarized light by the conventional light leakage (light on the left and right simultaneously incident on one side) It relates to a polarizing glasses that can improve cross talk.

Hereinafter, the present invention will be described in detail.

The polarizing glasses of the present invention comprise a λ / 4 phase difference layer for converting light of circular polarization into linear polarization, an auxiliary phase difference layer for converting light not linearly polarized by the λ / 4 phase difference layer, and the auxiliary phase difference layer. It includes a polarizer for passing the light emitted from.

The λ / 4 retardation layer is a layer that delays the phase by 1/4 wavelength with respect to the incident light λ, and converts light of circularly polarized light incident into polarized glasses into linearly polarized light.

The λ / 4 retardation layer may be a λ / 4 liquid crystal coating layer by liquid crystal coating or a λ / 4 retardation film by stretching of the film.

The liquid crystal coating layer has optical anisotropy and can be manufactured using a liquid crystal compound having crosslinkability by light or heat. The liquid crystal compound may include, for example, a reactive liquid crystal compound (RM). Examples of the reactive liquid crystal compound (RM) include those described in Information Display 10, No. 1 (Recent Research Trends of Reactive Liquid Crystal Monomer (RM)).

The reactive liquid crystal compound 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 compound, it is possible to obtain a crosslinked polymer network while maintaining the aligned phase of the liquid crystal. When the reactive liquid crystal compound molecules are cooled from the clearing point, a large area domain having a structure that is better aligned at a relatively low viscosity in the liquid crystal phase may be obtained than when the liquid crystal polymer having the same structure is used.

The λ / 4 liquid crystal coating layer thus formed is mechanically and thermally stable because it has a solid thin film form while maintaining the characteristics such as optical anisotropy and dielectric constant of the liquid crystal.

The λ / 4 liquid crystal coating layer of the present invention may be formed by coating a liquid crystal coating composition containing a reactive liquid crystal compound directly on the auxiliary retardation layer surface.

In addition, the λ / 4 liquid crystal coating layer may be formed by bonding a transparent protective film to a secondary retardation layer surface using a known adhesive and coating a liquid crystal coating composition including a reactive liquid crystal compound directly on the transparent protective film surface.

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 λ / 4 liquid crystal coating layer may be formed by applying a composition for liquid crystal coating containing a reactive liquid crystal compound (RM) to a substrate, and then irradiating polarized ultraviolet rays, polarized electromagnetic waves, and the like to photocuring them.

(lambda) / 4 film layer manufactures a film by the solution forming method or the extrusion molding method, and it is preferable to extend this. Stretching is a single-axis stretching stretching in the mechanical flow direction; Transverse uniaxial stretching (eg, tenter stretching) stretching in a direction orthogonal to the mechanical flow direction; It can be produced by biaxial stretching or the like which simultaneously performs longitudinal and transverse, and it is preferable to apply a diagonally stretched film.

The left and right λ / 4 phase difference layers included in the polarizing glasses are arranged such that the slow axis forms 45 ° and −45 ° with respect to the transmission axis of the polarizer, respectively.

The auxiliary retardation layer serves to improve cross talk by converting light not linearly polarized by the λ / 4 retardation layer into linearly polarized light. In particular, the circularly polarized light incident on the inclined surface of the polarizing glasses becomes elliptical polarization when passing through the λ / 4 retardation layer, and crosstalk is generated by the elliptical polarized light. The present invention converts the elliptically polarized light passing through the λ / 4 retardation layer into linearly polarized light using an auxiliary retardation layer having specific optical properties.

As the auxiliary retardation layer, the refractive index ratio NZ of Equation 1 below is -0.5 <NZ <1, and the front retardation value RO of Equation 2 below is 50 <RO <300. In consideration of the film manufacturing process and the ease of material selection, 0 ≦ NZ <1 is preferable, and considering the phase difference compensation in the refractive index ratio NZ in the above preferred range, it is preferable that the wavelength is 100 nm ≦ RO ≦ 200 nm.

[Equation 1]

Nz = (Nx-Nz) / (Nx-Ny) = Rth / RO + 0.5

Where Nx and Ny are planar refractive indices, where Nx ≥ Ny and Nz are thickness direction refractive indices of the retardation layer, and d represents the thickness of the retardation layer.

[Equation 2]

RO = (Nx-Ny) × d

Where Nx and Ny are plane refractive indices of the retardation layer, and d represents the thickness of the retardation layer, where Nx ≥ Ny.

When the refractive index ratio NZ of the auxiliary retardation layer is out of the above range, the generation range of crosstalk according to the incident direction of light is widened. When the front retardation value RO is out of the above range, the uniformity of the retardation value is decreased. There is a problem that is difficult to secure.

The auxiliary retardation layer of the polarizing glasses is arranged such that its slow axis is horizontal (FIG. 1A) or vertical (FIG. 1B) with the transmission axis of the polarizer.

In addition, the auxiliary retardation layer may be by liquid crystal coating or by stretching of the film, it is preferable that by stretching of the film in the process.

The polarizer is generally used in the art and is not particularly limited as long as it can perform a polarizing function. Specifically, stretched polyvinyl alcohol, a wire grid and carbon nanotubes 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 polarizer may be bonded to the transparent protective film on any one or more surfaces. For example, as shown in FIG. 2, a λ / 4 retardation layer, an auxiliary retardation layer, a polarizer, and a transparent protective film may be formed.

As the transparent protective film, a film excellent in transparency, mechanical strength, thermal stability, moisture shielding, isotropy, and the like may be used. Specific examples include polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate and polybutylene terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resins; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymers; Polyolefin-based resins such as polyethylene, polypropylene, cyclo-based or norbornene-structured polyolefins, ethylene-propylene copolymers; Vinyl chloride-based resins; Amide resins such as nylon and aromatic polyamides; Imide resin; Polyether sulfone resin; Sulfone resins; Polyether sulfone resin; Polyether ether ketone resins; Sulfided polyphenylene resins; Vinyl alcohol-based resins; Vinylidene chloride-based resins; Vinyl butyral resin; Allyl resins; Polyoxymethylene resin; And films composed of thermoplastic resins such as epoxy resins, and the like, and films composed of blends of the above thermoplastic resins may also be used. Moreover, the film of thermosetting resin or ultraviolet curable resin, such as (meth) acrylic-type, urethane type, acrylurethane type, epoxy type, and silicone type, can also be used.

The content of the thermoplastic resin in the transparent protective film is 50 to 100% by weight, preferably 50 to 99% by weight, more preferably 60 to 98% by weight, most preferably 70 to 97% by weight. If the content is less than 50% by weight, it may not sufficiently express the original high transparency possessed by the thermoplastic resin.

Such a transparent protective film may be one containing an appropriate one or more additives. As an additive, a ultraviolet absorber, antioxidant, a lubricating agent, a plasticizer, a mold release agent, a coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent, etc. are mentioned, for example.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that such variations and modifications fall within the scope of the appended claims.

실시예 1Example 1

As shown in FIG. 1A, the light is emitted from a lambda / 4 phase difference layer for converting light of circularly polarized light into linearly polarized light, an auxiliary phase difference layer for converting light not linearly polarized by the lambda / 4 phase difference layer, and linearly polarized light. The polarizing glasses including the polarizer for passing the light was prepared.

The auxiliary retardation layer had a refractive index ratio (NZ) of 0.5 and a front retardation value (RO) of 200 nm, and was prepared by stretching a film. The λ / 4 retardation layer was formed by coating a reactive liquid crystal compound solution (Merck, RMS03-013) on the auxiliary retardation layer.

The slow axes of the λ / 4 retardation layers arranged on the left and right sides of the polarizing glasses are 45 ° clockwise and 45 ° counterclockwise, respectively, and the absorption axis of the polarizer and the slow axis of the auxiliary retardation layer are parallel to each other.

Figure 3 shows the visibility transmittance of the light measured in the black (black) after passing the light of the circularly polarized light incident in all directions with respect to the polarizing glasses surface. At this time, the incident light used short wavelength of 550nm, and the area exceeding 2% transmittance is indicated by red color, and the low transmittance part is indicated by blue color.

As shown in FIG. 3, it can be seen that the transmittance is low in blue within a direction inclined about 45 ° from the direction perpendicular to the polarizing glasses surface (up and down viewing angle range of the eye when viewed from the front). The low transmittance means that circularly polarized light is converted into linearly polarized light so that no crosstalk is generated.

실시예 2Example 2

In the same manner as in Example 1, but was bonded to a triacetyl cellulose (TAC) film on the observer side of the polarizer as shown in Figure 2 to prepare a polarizing glasses.

The light transmittance of the light measured in the black state after passing the light of circularly polarized light incident in all directions with respect to the polarizing glasses surface was the same as that of FIG. 3.

실시예 3Example 3

In the same manner as in Example 1, Polarizing glasses were manufactured using an auxiliary retardation layer having a refractive index ratio NZ of 0 and a front retardation value RO of 100 nm.

FIG. 4 is a light transmittance of light measured in a black state after passing circularly polarized light incident in all directions with respect to the polarizing glasses surface, and no black light is generated. Can be confirmed.

실시예 4Example 4

In the same manner as in Example 1, Polarizing glasses were prepared using an auxiliary retardation layer having a refractive index ratio (NZ) of -0.5 and a front retardation value (RO) of 100 nm.

FIG. 5 is a light transmittance of light measured in a black state after passing circularly polarized light incident from all directions with respect to the polarizing glasses surface, and no black light is generated. Can be confirmed.

실시예 5Example 5

In the same manner as in Example 1, Polarizing glasses were manufactured using an auxiliary retardation layer having a refractive index ratio (NZ) of -0.5 and a front retardation value (RO) of 250 nm.

FIG. 6 is a transmissivity of light measured in a black state after passing circularly polarized light incident in all directions with respect to the polarizing glasses surface, and no black light is generated. Can be confirmed.

비교예 1Comparative Example 1

In the same manner as in Example 1, except that the auxiliary retardation layer to prepare a polarizing glasses.

FIG. 7 is a view through which light of circularly polarized light incident in all directions with respect to the polarizing glasses surface is passed through the polarizing glasses prepared above, and measured in the black state, and crosstalk is generated by light leakage. You can check it.

비교예 2Comparative Example 2

The polarizing glasses were manufactured in the same manner as in Example 1, but using an auxiliary phase difference layer having a refractive index ratio (NZ) of -0.5 and a front phase difference value (RO) of 300 nm.

FIG. 8 is a view through which the circular polarized light incident in all directions with respect to the polarizing glasses surface passes through the polarizing glasses prepared above, and the visibility of the light measured in the black state is generated. You can check it.

비교예 3Comparative Example 3

The polarizing glasses were manufactured in the same manner as in Example 1, but using an auxiliary phase difference layer having a refractive index ratio NZ of 1 and a front phase difference value RO of 50 nm.

FIG. 9 is a transmissivity of light measured in a black state after passing circularly polarized light incident in all directions with respect to the polarizing glasses surface, and black cross-talk is generated by light leakage. You can check it.

Claims

Passing a λ / 4 retardation layer for converting circularly polarized light into linearly polarized light, an auxiliary retardation layer for converting light not linearly polarized by the λ / 4 retardation layer into linearly polarized light, and light emitted from the auxiliary retardation layer And a polarizer, wherein the auxiliary retardation layer has optical properties of -0.5 <NZ <1 and 50nm <RO <300nm.
The polarizing glasses of claim 1, wherein the auxiliary retardation layer is 0 ≦ NZ <1 and 100 nm <RO <250 nm.
The polarizing glasses of claim 2, wherein the slow axis of the auxiliary retardation layer is disposed in parallel or perpendicular to the transmission axis of the polarizer.
The polarizing glasses of claim 1, wherein the λ / 4 retardation layer is by liquid crystal coating or by stretching of a film.
The polarizing glasses of claim 4, wherein the liquid crystal coating layer comprises a reactive liquid crystal compound (RM).
The polarizing glasses of claim 1, wherein a transparent protective film is bonded to one surface of the polarizer.