KR20110113968A - A wire grid polarizer, liquid crystal display, 3d-display including the same and method of manufacturing the wire grid polarizer - Google Patents

Abstract

The present invention relates to a wire grid polarizer capable of obtaining high brightness and reducing the number of processes, a liquid crystal display including the same, and a method of manufacturing the wire grid polarizer.
According to the present invention, the first grating disposed side by side at a predetermined interval on the substrate and the wire grid polarizer including the second grating on the first grating can be formed only by an imprint process, a deposition process, and a wet etching process. As a result, the number of processes can be reduced, thereby reducing the process cost and time, thereby ensuring the reliability.

Description

WIRE GRID POLARIZER, LIQUID CRYSTAL DISPLAY, 3D-DISPLAY INCLUDING THE SAME AND METHOD OF MANUFACTURING THE WIRE GRID POLARIZER}

The present invention relates to a wire grid polarizer capable of obtaining high brightness and reducing the number of processes, a liquid crystal display including the same, and a method of manufacturing the wire grid polarizer.

In general, a polarizer or a polarizer refers to an optical device that derives linearly polarized light having a specific vibration direction among unpolarized light such as natural light. One type of optical device, a wire grid polarizer, is an optical device that generates polarized light using a conductive wire grid. Since it has higher polarization separation performance than other polarizers, it has long been used as a reflective polarizer useful in the wavelength range of the infrared region.

Such a process of forming a wire grid polarizer is a 6-7 process, such as a metal deposition process, a photoresist coating, a photolithography, a photoresist development, a metal layer etching process, a photoresist strip process, and the like, on a substrate. It can be formed through the steps, which causes the problem of increased time and cost.

In addition, the most important factor that determines the performance of the wire grid polarizer is the relationship between the interval pitch between the wire grids and the incident light wavelength. That is, when the pitch between the wire grids is not sufficiently small, the incident light is not polarized and diffracted, so it is difficult to expect a desired effect. As such, the pitch between the wire grids, the width and the height of the wire grids are important factors in the polarization characteristic of the wire grid polarizer. However, it is difficult to control the width and height of the wire grid using the existing process described above.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a wire grid polarizer including a first grating disposed side by side at a predetermined interval on a plate and a second grating on the first grating. It is to provide a manufacturing process that can be secured by reducing the number of processes to reduce the process cost and time by manufacturing only by an imprint process, a deposition process, and a wet etching process.

Particularly, another object of the present invention is to provide a wire grid polarizer capable of improving transmittance by having a second grating having a structure capable of maximizing luminance and maximizing polarization efficiency by a wet etching process.

The present invention provides a means for solving the above problems, comprising: a first lattice layer having at least one first lattice having a constant pitch and height on a substrate; And a second lattice layer having at least one second lattice having a constant pitch and height on the first lattice. The ratio of the width of the first lattice to the width of the second lattice is 1 :( 0.2 to 1.5) can be provided to provide a wire grid polarizer characterized in that.

In this case, the first grid and the first grid layer of the above-described wire grid polarizer may be formed of a polymer material, and the second grid may be formed of a metal material.

In particular, in the above-described structure, the structure of the second lattice, the ratio of the width of the second lattice and the interval of the second lattice satisfies 1: (0.2 ~ 1.5), or the width of the second lattice and the second The ratio of the height of the lattice may satisfy 1: (1 to 5), or the ratio of the pitch of the second lattice to the height of the second lattice may satisfy 1: (1 to 5).

In addition, the wire grid polarizer of the above-described structure according to the present invention is formed so that the ratio of the width of the first lattice and the interval of the first lattice satisfies 1: (0.2 ~ 1.5), or the The ratio of the width and the height of the first lattice may be formed to satisfy 1: (0.2 to 5).

In any case, the pitch of the second lattice or the pitch of the first lattice can be formed in the range of 50 nm to 1 μm.

Furthermore, the first lattice and the second lattice according to the present invention may be formed in a cross-sectional shape in a circle, ellipse, or polygonal shape.

The wire grid polarizer having the above-described structure may be formed by the following process. Specifically, the manufacturing process according to the present invention comprises a first step of forming a plurality of first grids having a predetermined pitch by processing the first grid base layer laminated on the substrate; Forming a second lattice base layer on the first lattice; A third step of forming a plurality of second grids by etching the second grid base layer, wherein a ratio of the width of the first grid to the width of the second grid is formed to satisfy 1: (0.2 to 1.5); It can be configured to include.

In this case, the first step is formed by pressing an imprint mold having a plurality of grooves on the first grid base layer of a polymer material to form a plurality of first grids in a region corresponding to the plurality of grooves. can do.

In addition, the second step may be configured to form a metal material layer through a deposition process.

In particular, in the above-described manufacturing process, in the first step, the ratio of the width of the first lattice to the distance of the first lattice satisfies 1: (0.2 to 1.5), or the width of the first lattice and the first lattice. It is preferable to form so that the ratio of the height of a grating may satisfy | fill 1: (0.2-5).

Furthermore, in the manufacturing process according to the present invention, the third step is performed by a wet etching process, and the ratio of the width of the second lattice and the distance between the second lattice satisfies 1: (0.2 to 1.5), or the second The ratio of the width of the lattice to the height of the second lattice satisfies 1: (1 to 5), or the ratio of the pitch of the second lattice to the height of the second lattice is 1: (1 to 5). It can be formed by performing an etching process to satisfy.

The wire grid polarizer having the above-described structure according to the present invention can be applied to a liquid crystal display device.

Specifically, a liquid crystal display panel; A backlight unit for supplying light to the liquid crystal display panel; The liquid crystal display including the wire grid polarizer according to the present invention described above may be formed on any one of an upper surface or a lower surface of the liquid crystal display panel or a plurality of optical sheets for increasing the efficiency of light included in the backlight unit. have.

The wire grid polarizer included in the liquid crystal display may have a ratio of a width of the first lattice to a distance between the first lattice to be 1: (0.2 to 1.5), or a width of the first lattice and the first lattice. As described above, the height ratio may be formed to satisfy 1: (0.2 to 5).

Wire grid polarizer according to the present invention can be applied to a device for displaying a three-dimensional stereoscopic image in addition to the above-described liquid crystal display device.

According to the present invention, a first grating disposed side by side at a predetermined interval on a substrate and a wire grid polarizer including a second grating on the first grating can be formed only by an imprint process, a deposition process, and a wet etching process. As a result, the number of processes can be reduced, thereby reducing the process cost and time, thereby ensuring the reliability.

In addition, by forming a second grating to have an optimal height and width by a wet etching process, the transmittance may be improved to improve luminance and polarization efficiency.

1 is a perspective view showing the principle of operation of the wire grid polarizer according to the present invention.
FIG. 2 is a cross-sectional view for describing the height and width of each of the first and second gratings of the wire grid polarizer shown in FIG. 1.
3 is a view showing the transmittance according to the height and width of the second grating of the wire grid polarizer according to the present invention.
4 is a graph showing transmittance and luminance.
5 to 7 are process diagrams illustrating a method of manufacturing a wire grid polarizer according to the present invention.
8 is a cross-sectional view illustrating a wire grid polarizer in which a pattern of a first grating according to the present invention is formed in a hemispherical shape.
9 to 11 are perspective views illustrating a method of manufacturing the wire grid polarizer shown in FIG. 8.
12 illustrates a structure of a wire grid polarizer according to another embodiment of the present invention.
13 illustrates a structure of a wire grid polarizer according to another embodiment of the present invention.
14 is a cross-sectional view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation according to the present invention. In the description with reference to the accompanying drawings, the same components are given the same reference numerals regardless of the reference numerals, and duplicate description thereof will be omitted. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

1 is a perspective view illustrating a working principle of a wire grid polarizer according to the present invention, and FIG. 2 is a cross-sectional view for describing a height and a width of each of the first and second grids of the wire grid polarizer shown in FIG. 1.

Referring to the drawings, the wire grid polarizer according to the present invention includes a plurality of wire grids (lattice structures) arranged side by side at a predetermined interval on the substrate. Such a wire grid polarizer is a vector orthogonal to the conductive wire grid when light in an unpolarized state is incident when the pitch (the distance plus the spacing between the lattice and the lattice) is sufficiently smaller than the wavelength of the incident light. The component having P, i.e., P polarized light is transmitted and the component having vector parallel to the wire grid, i.e., S polarized light is reflected.

Optical properties of such wire grid polarizers can be evaluated by transmittance, polarization efficiency, polarization extinction ratio, and the like. The polarization efficiency is (Tp-Ts) / (Tp + Ts) where Tp is P wave transmittance and Ts is S wave transmittance. The polarization extinction ratio is Tp / Ts. In other words, three characteristics can be evaluated to determine the required use.

A plurality of wire grids according to the present invention are formed on at least two layers and have a plurality of first grids 110 arranged side by side at a predetermined interval on the substrate 100 as shown in FIG. 1. And a second lattice layer including a lattice layer and a plurality of second lattices 112 formed on the first lattice 110 of the first lattice layer.

The optical characteristics of the wire grid polarizer depend on the width (F, C), height (E, D) of each of the first and second grids 110 and 112, or the pitch H of the first grid and the pitch of the second grid. Depends on (A). Herein, the pitch refers to the width of each lattice and the distance to the neighboring lattice. In the illustrated structure, the pitch H of the first lattice 110 is the distance G of the first lattice + the width of the first lattice ( The length of F) is defined, and the pitch A of the second lattice 112 is defined as meaning the spacing B of the second lattice and the width C of the second lattice.

In such a wire grid polarizer, transmittance may be adjusted according to the grid height and width. The wider the lattice width at the same pitch, the lower the transmittance and the higher the polarization extinction ratio.

In order to ensure maximum polarization efficiency, the polarization property increases as the pitch decreases, and when the distance between the same gratings and the width of the same grating is formed, the polarization property increases as the height of the grating increases, and the distance between the same gratings and the same grating When formed at the height of the polarization characteristics are improved as the width of the grating increases.

In this way, in order to obtain the maximum luminance, it is necessary to form the optimum pitch, the grating height and the width. In consideration of the conditions described above, the widths (F, C), the heights (E, D) of the first and second grids (110, 112), or the pitches (A, H) between the grids, respectively, are shown in Table 1 below. It can be formed together. In the illustrated structure, B means an interval between the second lattice, and G means an interval between the first lattice.

{Table 1}

Referring to Table 1 and FIG. 2, the wire grid polarizer according to the present invention may have a first grid 110 having a width F and a height E at a constant pitch H on the substrate 100. At least one first grid layer having at least one, and at least one second grid 112 having a width (C) and a height (D) at a constant pitch (A) on the first grid 110. It is preferable to comprise a second grid layer. In this case, in particular, the ratio of the width F of the first lattice to the width C of the second lattice is preferably formed to satisfy F: C = 1: (0.2 to 1.5).

In addition, the second grid 112 is formed of a metal material, the ratio of the width (C) of the second grid and the spacing (B) of the second grid C: B = 1: (0.2 ~ 1.5) Satisfactory, or the ratio of the width C of the second lattice to the height D of the second lattice satisfies C: D = 1: (1 to 5), or further, the pitch A of the second lattice. And the ratio of the height D of the second lattice to satisfy A: D = 1: (1 to 5). The above structure is to maximize the transmittance, luminance, polarization efficiency. In particular, in this case, the pitch A of the second lattice 112 is preferably formed in the range of 50nm to 1㎛.

In particular, the result of measuring the degree of improvement of the transmittance in consideration of only the ratio of the pitch A of the second lattice 112 and the height D of the second lattice 112 is as follows.

Figure 3 is a preferred example of the present invention, the ratio of the pitch (A) of the second lattice and the height (D) of the second lattice is measured with a value in the range that satisfies A: D = 1: (1 to 5) One result.

FIG. 3A illustrates a height D of the second lattice 112 at 100 to 150 nm, and a second lattice (when the pitch A of the second grating 112 is formed at 100 to 200 nm. The transmittance | permeability by narrowing the width | variety C of 112 is shown.

In addition, (b) is a second grating when the height (D) of the second grating 112 is formed to be 151 ~ 200nm, the pitch A of the second grid 112 is formed to 100 ~ 200nm, The transmittance | permeability by narrowing the width C of 112 is shown.

In addition, (c) is the height (D) of the second grating 112 is formed 201 ~ 300nm, the second grating 112 when the pitch (A) of the second grating 112 is formed 100 ~ 200nm. The transmittance | permeability by narrowing the width | variety (C) of) is shown. That is, in the range of A: D = 1: (1 to 5) as shown in FIGS. 3A, 3B, and 3C, the height D of the second grating 112 is made constant, and the second It can be seen that as the width C of the grating 112 is gradually narrowed, the transmittance is improved.

For example, as shown in FIG. 4, when the transmittance is 40 to 60%, the luminance is preferably high when it is 50%. Therefore, high transmittance is exhibited when formed with the height (E, D) and width (F, C) of the first and second gratings (110, 112) or the pitch (A) of the second grating (112) according to the present invention. It can be seen.

Table 2 also shows the transmittance and polarization efficiency according to the pitch A between the second gratings 112 of the present invention.

{Table 2}

In addition to the structure of the second grid according to the present invention described above, it is possible to implement the maximum optical effect by adjusting the structure of the first grid according to the present invention. In particular, for this purpose, the first grid 110 in the present invention is composed of a polymer material, the ratio of the width (F) of the first grid and the distance (G) of the first grid is F: G = 1: (0.2 Or 1.5) or the ratio of the width F of the first lattice to the height E of the first lattice is preferably formed to satisfy F: E = 1: (0.2 to 5). . In addition, the pitch H of the first grid in the present invention described above can be formed in the range of 50 nm to 1 μm.

The first grid and the second grid according to the present invention may be formed in various shapes such as stripes, curves, squares, triangles, and the like. That is, the first lattice and the second lattice may have various cross-sections, such as a circle, an ellipse, or a polygonal shape.

Hereinafter, a manufacturing process of the wire grid polarizer according to the present invention will be described with reference to FIGS. 5 to 7. 5 to 7 illustrate a manufacturing process diagram of the wire grid polarizer according to the present invention. In the present embodiment, the first grid and the second grid are formed in the form of stripes.

In the manufacturing process of the wire grid polarizer according to the present invention, the first step of forming a plurality of first grating 110 having a constant pitch by processing the first lattice base 122 layer laminated on the substrate, and the first And a second step of forming the second grid base layer 124 on the lattice, and a third step of forming the plurality of second grids 112 by etching the second grid base layer 124.

In this case, in particular, the ratio of the width F of the first lattice to the width C of the second lattice in the third step is preferably F: C = 1: (0.2 to 1.5).

Referring to FIG. 5, firstly, in the first step of the manufacturing process according to the present invention, a first lattice base layer 122 is formed by applying, for example, a UV resin (resin) on a substrate 100. Subsequently, the imprint mold 120 having the groove 126 and the protrusion 128 is aligned on the substrate 100 to which the first lattice base layer 122 is applied. Here, the plurality of grooves 126 and the protrusions 128 of the imprint mold 120 are repeatedly formed in a form spaced apart from each other by a predetermined interval. In addition, the groove 126 of the imprint mold 120 corresponds to the position where the first grid 110 is to be formed.

At this time, the height and width of the groove 126 of the imprint mold 120 will correspond to the width (F) of the first lattice and the height (E) of the first lattice later, according to the present invention It is preferable to form so as to correspond to F: E = 1: (0.2 to 5) which is a ratio of the height E of the first lattice and the width F of the first lattice.

That is, in the case of manufacturing the mold for imprint, the resultant structure of the first lattice has a ratio of the width F of the first lattice and the distance G of the first lattice to F: G = 1: (0.2 ~ 1.5), or adjust the groove and height of the imprint so that the ratio of the width (F) of the first grid to the height (E) of the first grid satisfies F: E = 1: (0.2-5) It is preferable to form.

In addition, the groove 126 of the imprint mold 120 is formed in a stripe shape. The imprint mold 120 presses the polymer material 122 such that the groove 126 portion of the imprint mold 120 and the polymer material 122 contact each other, and then irradiates UV. Accordingly, the polymer material 122 is formed with a plurality of first grids 110 in portions corresponding to the grooves 126 of the imprint mold 120.

Subsequently, as shown in FIG. 6, a second lattice base layer 124, which is a metal layer, is deposited on the substrate 100 on which the plurality of first gratings 110 are formed, and then the second lattice base as shown in FIG. 7. The layer 124 is etched to form a second lattice 112 on the first lattice 110.

In detail, the second lattice 112 is formed by performing a wet etching process on the second lattice base layer 124, which is a metal layer deposited on the substrate 100 on which the plurality of first lattice 110 is formed.

In addition, a ratio of the width C of the second lattice C and the spacing B of the second lattice as a result of the wet etching process described above satisfies C: B = 1: (0.2 to 1.5), or the second The ratio of the width C of the lattice to the height D of the second lattice satisfies C: D = 1: (1 to 5), or the pitch A of the second lattice and the second lattice It is preferable to perform an etching process so that the ratio of height D may satisfy | fill any one or more of A: D = 1: (1-5). As a result, a wire grid polarizer having a second grating 112 formed on the first grid 110 of the substrate 100 is formed.

5 to 7, the wire grid polarizer including the first and second grids 110 and 112 may be formed through only an imprint process, a deposition process, and a wet etching process. This reduces the manufacturing process and can be applied to mass production and cost savings.

8 is a cross-sectional view illustrating a case in which the first grating 140 of the wire grid polarizer has a semi-circular curve instead of a stripe shape, and FIGS. 9 to 11 are methods of manufacturing the wire grid polarizer shown in FIG. 8. In addition, since the drawings have the same process and the same structure as those of FIGS. 2 and 5 to 7, the description thereof will be omitted. However, in this case, when the cross section of the first grid is semi-circular or semi-elliptical, and the outer surface has curvature, the width (F) of the first grid and the gap G of the first grid are Define the width (F) of the first grid and the distance (G) of the first grid based on the portion drawn down the vertical line at the point where the horizontal line of half the height (E) meets the curved surface of the first grid. do.

In addition, as shown in FIG. 12, the first grid 110 may have a stripe shape, and the second grid may have a circular or oval shape. This may form the first grid 110, the second grid base layer, and when the wet etching process is adjusted to implement a wire grid polarizer as shown in the structure of FIG.

FIG. 13 shows another embodiment according to the present invention, in which the structure shown is a ratio of the width F of the first lattice F to the width C of the second lattice F in a preferred embodiment according to the present invention. In the case of implementing C = 1: (0.2 to 1.5), the width of the second lattice may be wider than that of the first lattice. That is, the shape of the case where the width (C) of the second grid is implemented 1 to 1.5 times the width (F) of the first grid. Of course, in the illustrated structure, the second grating may have an elliptic curvature on the outside thereof, or may have a stripe shape or a rectangular shape.

14 is a cross-sectional view of a liquid crystal display including a wire grid polarizer according to the present invention.

Referring to FIG. 14, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal display panel 200, a backlight unit 230 that supplies light to the liquid crystal display panel 200, and a liquid crystal display panel 200. It includes a wire grid polarizer formed by patterning on either side of the optical sheet included in the upper / lower or the backlight unit. The backlight unit 230 includes a light source 232, a diffusion sheet 236 for diffusing light from the light source 232, and a reflection sheet 234 disposed under the light source 232.

The light source 232 may be formed of any one of a Cold Cathode Fluorescent Lamp (CCFL), an External Electrode Fluorescent (EEFL), and a Light Emitting Diode (LED). The light source 232 generates light and emits the light toward the diffusion sheet 236.

The reflective sheet 234 is formed of a material having high reflection efficiency to reduce light loss by reflecting light traveling in the opposite direction of the liquid crystal display panel 200 toward the diffusion sheet 236.

The diffusion sheet 236 directs the light incident from the light source 232 toward the front of the liquid crystal display panel 200 and diffuses the light to have a uniform distribution in a wide range so that the diffusion sheet 236 is irradiated onto the liquid crystal display panel 200. do. As the diffusion sheet 236, it is preferable to use a film made of a transparent resin coated with a predetermined light diffusion member on both surfaces.

The liquid crystal display panel 200 includes a color filter substrate 212, a thin film transistor substrate 210 bonded to face the color filter substrate 212 with the liquid crystal layer 202 therebetween, and a color filter substrate 212. And a thin film transistor substrate 210.

The color filter substrate 212 includes a black matrix for preventing light leakage, a color filter for implementing color, a common electrode forming a vertical electric field with a pixel electrode, and a color alignment array including an upper alignment layer coated thereon for liquid crystal alignment. Is formed on the upper substrate. The thin film transistor substrate 210 includes a gate line and a data line formed to cross each other, a thin film transistor formed at an intersection thereof, a pixel electrode connected to the thin film transistor, and a lower alignment layer coated thereon for liquid crystal alignment. A thin film transistor array is formed on the lower substrate.

As shown in FIG. 14, the wire grid polarizer according to the present invention may be formed under the liquid crystal display panel 120, and may include an upper surface of the liquid crystal display panel 200 or an optical sheet included in the backlight unit 230. It can be formed on either side. In addition, the wire grid polarizer according to the present invention may be attached to the surface of the liquid crystal module as shown in the drawing, may be arranged at a predetermined interval, and furthermore, the second grid may face upwards, or may face downwards.

In addition, the wire grid polarizer according to the present invention may include a first grating 110 disposed side by side at a predetermined interval on the lower surface of the liquid crystal display panel 200, and a second grating 112 formed on the first grating 110. ).

In addition to being used in the above-described liquid crystal display device, the wire grid polarizer according to the present invention is also applied to a display device capable of realizing a 3D stereoscopic image, thereby achieving high versatility and high reliability.

In the foregoing detailed description of the present invention, specific examples have been described. However, various modifications are possible within the scope of the present invention. The technical idea of the present invention should not be limited to the embodiments of the present invention but should be determined by the equivalents of the claims and the claims.

100: substrate
110,140: first grid
112,142: second lattice
120: imprint mold
122: first lattice base layer
124: second grid base layer
200: liquid crystal display panel
230: backlight unit
A: pitch of the second lattice
B: spacing of the second lattice
C: width of the second lattice
D: height of the second lattice
E: height of the first grid
F: width of the first grid
G: spacing of the first lattice
H: pitch of the first lattice

Claims (17)

A first grid layer having at least one first grid having a constant pitch and height on the substrate;
And a second lattice layer having at least one second lattice having a constant pitch and height on the first lattice.
The ratio of the width of the first lattice to the width of the second lattice satisfies 1: (0.2 to 1.5).
The method according to claim 1,
The first grid and the first grid layer is formed of a polymer material, the second grid is a wire grid polarizer, characterized in that formed of a metallic material.
The method according to claim 2,
The ratio of the width of the second lattice to the interval of the second lattice satisfies 1: (0.2 ~ 1.5), the wire grid polarizer.
The method according to claim 2,
The ratio of the width of the second lattice to the height of the second lattice satisfies 1: (1 ~ 5), the wire grid polarizer.
The method according to claim 2,
The ratio of the pitch of the second lattice and the height of the second lattice satisfies 1: (1 ~ 5), the wire grid polarizer.
The method according to any one of claims 1 to 5,
The ratio of the width of the first lattice to the spacing of the first lattice satisfies 1: (0.2 to 1.5).
The method of claim 6,
The ratio of the width of the first lattice to the height of the first lattice satisfies 1: (0.2 to 5).
The method according to claim 1,
The pitch of the second grid or the pitch of the first grid is 50nm ~ 1㎛ wire grid polarizer, characterized in that.
The method according to claim 8,
The first grid and the second grid is a wire grid polarizer, characterized in that the cross section is formed in a circle, ellipse, or polygonal shape.
A first step of forming a plurality of first grids having a constant pitch by processing the first grid base layer stacked on the substrate;
Forming a second lattice base layer on the first lattice;
A third step of forming a plurality of second grids by etching the second grid base layer, wherein a ratio of the width of the first grid to the width of the second grid is formed to satisfy 1: (0.2 to 1.5); A method for producing a wire grid polarizer, comprising:
The method according to claim 10,
In the first step,
Manufacturing a plurality of first grids in a region corresponding to the plurality of grooves by pressing an imprint mold having a plurality of grooves on the first grid base layer of a polymer material. Way.
The method of claim 11,
The second step comprises:
Method of manufacturing a wire grid polarizer, characterized in that the step of forming a metal material layer through a deposition process.
The method according to any one of claims 10 to 12,
In the first step,
The ratio of the width of the first lattice to the spacing of the first lattice satisfies 1: (0.2 to 1.5),
The ratio of the width of the first lattice to the height of the first lattice is formed so as to satisfy 1: (0.2 to 5).
The method according to claim 13,
The third step is performed by a wet etching process,
The ratio of the width of the second lattice to the distance of the second lattice satisfies 1: (0.2 to 1.5),
The ratio of the width of the second lattice to the height of the second lattice satisfies 1: (1 to 5),
Or performing an etching process such that a ratio of the pitch of the second lattice to the height of the second lattice satisfies 1: (1 to 5).
A liquid crystal display panel;
A backlight unit for supplying light to the liquid crystal display panel;
The liquid crystal of claim 1, wherein the liquid crystal display panel includes a wire grid polarizer according to claim 1, on any one of an upper surface or a lower surface of the liquid crystal display panel or a plurality of optical sheets for increasing efficiency of light included in the backlight unit. Display device.
The method according to claim 15,
The wire grid polarizer,
The ratio of the width of the first lattice to the spacing of the first lattice satisfies 1: (0.2 to 1.5),
And a ratio of the width of the first lattice to the height of the first lattice to satisfy 1: (0.2 to 5).
3D stereoscopic image display device comprising the wire grid polarizer of any one of claims 1 to 5.

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