KR100952137B1 - Stereoscopic Image Display Device And Method Thereof - Google Patents

Abstract

The present invention relates to a stereoscopic image display apparatus and a method of manufacturing the same, and more particularly, to a stereoscopic image using only three substrates replacing the conventional structure using four substrates using a wire grid polarizer (WGP). The present invention relates to a stereoscopic image display device and a method of manufacturing the same, which can reduce the unit cost and increase the efficiency of a process by implementing a display device and implement high resolution according to free adjustment of viewing distance.

Stereoscopic Display, Wire Grid Polarizer

Description

Stereoscopic Image Display Device and Manufacturing Method Thereof {Stereoscopic Image Display Device And Method Thereof}

The present invention relates to a stereoscopic image display apparatus and a method of manufacturing the same, and more particularly, to a stereoscopic image using only three substrates replacing the conventional structure using four substrates using a wire grid polarizer (WGP). The present invention relates to a stereoscopic image display device and a method of manufacturing the same, which can reduce the unit cost and increase the efficiency of a process by implementing a display device and implement high resolution according to free adjustment of viewing distance.

In general, three-dimensional images representing three-dimensional images are made by the principle of stereo vision through two eyes. The binocular disparity, which appears because two eyes are about 65 mm apart, is the most important factor of stereoscopic feeling. have.

The left and right eyes each look at different two-dimensional images, and when these two images are delivered to the brain through the retina, the brain recognizes them and reproduces the depth and reality of the three-dimensional image.

Conventionally, the method of viewing a 3D stereoscopic image can be largely divided into an eyeglass method and an eyeglass method according to whether the viewer wears glasses.

The eyeglass method is an anaglyph method that uses blue and red sunglasses on both eyes, a concentration difference method that feels three-dimensional by attaching filters having different transmittances to the left and right glasses, and a polarized eyeglass method that uses polarized glasses with different polarization directions, respectively. There is a time-division method of wearing glasses with a liquid crystal shutter that periodically repeats a time-divided screen and synchronizes the period.

However, the method of wearing glasses has a problem in that it is uncomfortable to wear glasses, and it is troubled to observe other objects except stereoscopic images in the state of wearing glasses. Therefore, recently, studies on the glasses-free method without wearing glasses have been actively conducted.

A typical type known as the autostereoscopic method is a parallax barrier that separates left and right images by a lenticular method in which a vertically arranged cylindrical lens array plate is installed in front of the image panel and an optical barrier on the slit. barrier).

1 illustrates an implementation principle of a conventional paralex barrier method.

Referring to FIG. 1, the light passing through the left eye panel L of the liquid crystal panel reaches the left eye of the observer through the barrier of the parallax among the light emitted from the backlight, and the light passing through the right eye pixel of the liquid crystal panel It reaches the observer's right eye through the slit of the Pararex barrier, and the viewer perceives it as a 3D stereoscopic image.

2 is a cross-sectional view showing the configuration of a conventional parallax barrier type stereoscopic image display device.

Referring to FIG. 2, the conventional Parallax barrier type stereoscopic image display apparatus includes a backlight unit 10 that supplies a large amount of light, and a liquid crystal panel 20 that displays a planar image by using light emitted from the backlight unit. TFT-LCD Panel), and a parallax barrier panel 30 for displaying a planar image of the liquid crystal panel as a stereoscopic image.

Here, the liquid crystal panel 20 is the same as a conventional LCD panel, and includes a thin film transistor substrate 210 and a color filter substrate 220 facing each other with the liquid crystal 230 therebetween. The liquid crystal 230 made of a material having dielectric anisotropy and refractive index anisotropy rotates according to the difference between the pixel voltage and the common voltage Vcom applied thereto to adjust the light transmittance.

The thin film transistor substrate 210 may include a substrate 211, a thin film transistor 212 formed on the substrate, and a pixel electrode 213 formed on the thin film transistor. 220 may include a substrate 221, a color filter 222 formed on the substrate, and a common electrode 223 formed on the color filter.

Specific configuration and operation of the liquid crystal panel is obvious to those skilled in the art, so a detailed description thereof will be omitted.

The parallax barrier panel 30 includes a transparent paralex barrier lower substrate 310 and a paralex barrier upper substrate 320 facing each other with the liquid crystal 330 interposed therebetween, unlike the liquid crystal panel. In the Lex barrier lower substrate 310, a transparent stripe electrode 312 having a simple stripe shape is formed on the substrate 311 without distinguishing pixels, and the Paralex barrier upper substrate 320 has a common electrode 322 formed on a substrate ( 321 is formed.

In addition, a second polarizing plate 420 is disposed between the first polarizing plate 410, the second substrate 220 of the liquid crystal panel 220, and the third substrate 310 of the Paralex barrier panel at the bottom of the first substrate 210 of the liquid crystal panel. The third polarizer 430 is formed on the fourth substrate 320 of the parallax barrier panel.

For this reason, the conventional Parallax barrier type stereoscopic image display device includes four substrates 210, 220, 310, and 320 and three polarizers 410, 420, and 430.

Therefore, the conventional Paralex barrier type stereoscopic image display device is a method of manufacturing two substrate liquid crystal panels and two substrate Parallax barrier panels and combining the two panels, so that liquid crystals must be injected separately. Since four substrates are used, the manufacturing cost is high and the efficiency of the process is lowered.

In addition, since the distance between the four substrates (gap) is limited by the viewing distance and the liquid crystal parallax barrier pitch (Pitch) there was a problem that can not obtain a high resolution image.

In order to solve the above problems, an object of the present invention is to display a three-dimensional image display using only three substrates replacing the conventional structure using four substrates using a wire grid polarizer (WGP). It is to provide a stereoscopic image display device that can implement a device to reduce the unit cost and increase the efficiency of the process, and to realize a high resolution by freely adjusting the viewing distance.

In order to achieve the above object, a stereoscopic image display apparatus according to the present invention includes a liquid crystal panel and a parallax barrier panel, and includes a wire grid polarizer formed on a color filter substrate of the liquid crystal panel. The pararex barrier panel is formed on the color filter substrate on which the wire grid polarizer is formed.

Here, the parallax barrier panel is characterized in that a transparent barrier electrode is formed on the wire grid polarizer without a substrate.

The substrate is a glass substrate.

In addition, the distance g between the liquid crystal panel and the Paralex barrier panel is 1.5 mm or less.

Meanwhile, in the method of manufacturing a stereoscopic image display apparatus using a Paralex barrier, a liquid crystal panel is manufactured by forming a wire grid polarizer on one surface of a substrate and a color filter substrate on the other surface of the substrate on which the wire grid polarizer is formed. And forming a parallax barrier panel on one surface of the substrate on which the wire grid polarizer is formed.

Here, the substrate is characterized in that the glass substrate.

The method may further include simultaneously injecting liquid crystal into the liquid crystal panel and the Paralex barrier panel.

In addition, the manufacturing of the parallax barrier panel may include forming a transparent barrier electrode without a substrate on one surface of the substrate on which the wire grid polarizer is formed.

The gap g between the liquid crystal panel and the Paralex barrier panel is 1.5 mm or less.

As described above, the stereoscopic image display apparatus according to the present invention implements a stereoscopic image display apparatus using only three substrates replacing the conventional structure using the long substrate, thereby shortening the process and reducing the manufacturing cost, thereby improving the efficiency of the process. Excellent effect to increase occurs.

In addition, there is an excellent effect of reducing the viewing distance without losing image brightness to realize display pixels at high resolution.

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

3 is a schematic cross-sectional view of a stereoscopic image display apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the stereoscopic image display apparatus according to the present invention includes a backlight unit 10, a liquid crystal panel 20 formed on the backlight unit, and a parallax barrier panel 30 formed on the liquid crystal panel. It is configured by.

Here, in the stereoscopic image display apparatus according to the present invention, the configuration of the liquid crystal panel is the same as that of a conventional liquid crystal panel, but the third substrate 311 of FIG. The polarizer (420 of FIG. 2) formed between the Lex Barrier panels is distinguished from the conventional stereoscopic image display device in that the polarizing plate (420 of FIG. 2) is composed of a wire grid polarizer (WGP, 440).

4 is a conceptual diagram illustrating the principle of the Paralex barrier method.

Referring to FIG. 4, the principle of the binocular liquid crystal parallax barrier is shown, and it can be seen that the pixel and the barrier are located at the center of the L and R pixel pairs from the center line of the observation point. If a geometric structure is used to design the pitch b of the parallax barrier, <Equation 1a> can be obtained from FIG. 4, and if <Equation 1a> is summarized, <Equation 1b> can be obtained.

Where b = parallax barrier pitch

        g = liquid crystal panel and parallax barrier panel spacing

        i = pixel size

        z = viewing distance

It can be seen from Equation 1b that the barrier pitch b of the binocular display is smaller than twice the display pixel pitch i.

This small difference between the pixel and the barrier pitch determines the change in audiovisual angle between the eye and the pixel passing through the display, which is called viewpoint adjustment.

From FIG. 4, the optimal viewing distance z can be expressed by Equation 2a, from which Equation 2b can be obtained.

Here, the distance e = 65 mm between the two eyes and the pixel pitch i are values determined by the display manufacturer, and the distance g between the display and the barrier is determined by the thickness of the LCD front materials and is preferably 1.5 mm or less. For example, if the distance between the pixels i = 0.1 mm and the distance between the LCD front and the polarizer g = 1.15 mm, there is little room for adjusting the viewing distance. The optimum viewing distance z = 750 mm of the Pararex barrier.

However, when the glass substrate thickness of the recently released 2D display is 0.4 to 0.63 mm, and the thickness of the polarizer is 0.2 mm, the viewing distance z = 390 mm can be reduced. However, considering the principle that the viewing angle increases as the viewing distance becomes shorter, the loss of image brightness on the edge of the 3D display must be considered.

Accordingly, the present invention implements a three-dimensional image display apparatus capable of three substrates, deviating from the conventional method using four substrates to solve the above problems caused by reducing viewing distance. This allows a reduction in viewing distance without loss of image brightness.

Hereinafter, a preferred method for manufacturing a stereoscopic image display device of the present invention will be described with reference to FIG. 6.

First, a thin film transistor substrate 210 having a thin film transistor formed on a substrate 211 of a liquid crystal panel is manufactured. Here, the method of forming the thin film transistor substrate 210 is not only obvious to those skilled in the art but also departs from the core of the present invention, and thus a detailed description thereof will be omitted.

Subsequently, a wire grid polarizer (WGP, 440) is formed on one surface of the substrate 221. (FIG. 6A) Here, the wire grid polarizer 440 is formed of a plurality of parallel supported by the substrate 221. It can consist of one conductive electrode.

In more detail, referring to FIG. 5, a metal thin film 440 is deposited on the substrate 221. The polymer 520 is coated on the metal thin film. In addition, the polymer 520 is pressed by the mold 510 having a prefabricated pattern so that the pattern of the mold 510 may be transferred to the polymer 520.

Subsequently, the mold 510 is positioned in parallel with the polymer 520, and then heat is applied to the mold 510 or irradiated with ultraviolet rays to cure the polymer 520.

The mold 510 is separated from the polymer 520. As a result, the pattern of the mold 510 is transferred to the polymer 520 from which the mold 510 is separated, thereby forming a pattern in which yin and yang are opposite to the mold 510.

After separating the mold 510 from the polymer 520 as described above, the entire surface of the polymer pattern is etched to expose the surface of the metal thin film 440.

Then, since the etched polymer 520 is patterned by the mold and there is a step, the thin polymer is removed by the etching process to expose the metal thin film 440 on the surface.

Subsequently, the metal thin film 440 exposed to the surface is etched through a dry etching process or a wet etching process to form a metal grid pattern. The polymer 520 remaining on the metal lattice pattern is removed. This completes the wire grid polarizer 440 having the desired lattice pattern on the substrate.

When the wire grid polarizer 440 is completed on one surface of the substrate 221, the color filter substrate 220 having the color filter 222 and the common electrode 223 formed on the other surface of the substrate 221 is manufactured.

Here, the manufacturing method of the color filter substrate 220 is not only apparent to those skilled in the art, but departs from the core of the present invention, and thus a detailed description thereof will be omitted.

When the color filter 222 and the common electrode 223 are formed on the substrate 221, the color filter substrate 220 and the thin film transistor substrate 210 are bonded to each other (FIG. 6B). The manufacturing order of the 220 and the thin film transistor substrate 210 may be selectively determined.

Subsequently, the Pararex barrier panel 30 is formed on the substrate 221 on which the wire grid polarizer 440 is formed (FIG. 6C).

More specifically, the transparent barrier electrode 312 is formed on the substrate 221 on which the wire grid polarizer 440 is formed, and the common electrode 322 is formed on the parallax barrier upper substrate 321 and then bonded. .

Then, the liquid crystal is injected into the liquid crystal panel 20 and the Paralex barrier panel 30 at the same time. (FIG. 6D) Next, the polarization is performed on the lower portion of the thin film transistor substrate 210 and the upper Parax barrier upper substrate 320. The polarizers 410 and 430 formed of the film are attached. (FIG. 6E).

Conventionally, the liquid crystal panel 20 and the Paralex barrier panel 30 are manufactured separately, and the liquid crystal is injected separately. However, the present invention provides a process of integrating the liquid crystal panel and the Paralex barrier panel and simultaneously injecting the liquid crystal. It can simplify and increase the efficiency of the process.

In addition, since a polarizer formed of a polarizing film is attached to a color filter substrate and a parallax barrier panel manufactured separately and a liquid crystal panel are attached to a liquid crystal panel, the parallax barrier panel must include two substrates. However, by forming a wire grid polarizer capable of selectively transmitting the polarizer on the color filter substrate, the Paralex barrier lower substrate is removed from the conventional four substrates by integrally forming the Paralex barrier panel on the color filter substrate. Only three boards can be configured.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

1 illustrates an implementation principle of a conventional paralex barrier method.

2 is a cross-sectional view showing the configuration of a conventional parallax barrier type stereoscopic image display device.

3 is a schematic cross-sectional view of a stereoscopic image display apparatus according to an exemplary embodiment of the present invention.

4 is a conceptual diagram illustrating the principle of the Paralex barrier method.

5 is a manufacturing process diagram of a wire and polarizer according to a preferred embodiment of the present invention.

6 is a flowchart schematically illustrating a method of manufacturing a stereoscopic image display device according to an exemplary embodiment of the present invention.

* Description of Signs of Major Parts of Drawings *

10: backlight unit 20: liquid crystal panel

210: thin film transistor substrate 211: substrate

212: thin film transistor 213: transparent electrode

220: color filter substrate 221: substrate

222: color filter 223: common electrode

230, 330: liquid crystal

30 Parallax barrier panel 312 transparent barrier electrode

320: parallax barrier upper substrate 322: common electrode

410, 420, 430: polarizer 440: wire grid polarizer

Claims (9)

In the stereoscopic image display device including a liquid crystal panel and a paralex barrier panel, And a wire grid polarizer formed on the color filter substrate of the liquid crystal panel, wherein the parallax barrier panel is formed on the color filter substrate on which the wire grid polarizer is formed. The method of claim 1, The Paralex Barrier Panel And a transparent barrier electrode formed on the wire grid polarizer without a substrate. The method according to claim 1 or 2, The substrate is A stereoscopic image display device, characterized in that the glass substrate. The method of claim 1, The distance g between the liquid crystal panel and the Paralex barrier panel is 3D image display device, characterized in that less than 1.5 mm. In the manufacturing method of a stereoscopic image display device using a paralex barrier, Forming a wire grid polarizer on one surface of the substrate; Manufacturing a liquid crystal panel by forming a color filter substrate on the other surface of the substrate on which the wire grid polarizer is formed; And forming a pararex barrier panel on one surface of the substrate on which the wire grid polarizer is formed. The method of claim 5, The substrate is Method for producing a stereoscopic image display device, characterized in that the glass substrate. The method of claim 5, And injecting liquid crystal into the liquid crystal panel and the parallax barrier panel at the same time. The method of claim 5, The Paralex barrier panel manufacturing step And forming a transparent barrier electrode without a substrate on one surface of the substrate on which the wire grid polarizer is formed. The method of claim 5, The distance g between the liquid crystal panel and the Paralex barrier panel is Method of manufacturing a stereoscopic image display device, characterized in that less than 1.5 mm.

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