KR20130006070A - Display device - Google Patents

Abstract

PURPOSE: A display device is provided to supply a wideband patterned retarder and wideband polarizing eyeglasses, thereby conveniently watching a 3D stereoscopic image. CONSTITUTION: A display panel displays a left eye image and a right eye image. A polarized film is formed on an upper side in the display panel. A patterned retarder includes a left eye area and a right eye area. The left eye area changes the left eye image to be a first polarized state. The right eye area changes the right eye image to be a second polarized state. The patterned retarder includes a half-wave laminated plate(HWP)(221) and a quarter wavelength plate(QWP)(223).

Description

Display device

The present invention relates to a display device, and more particularly, to a display device for displaying a stereoscopic image.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Recently, liquid crystal displays (LCDs), plasma display panels (PDPs), organic fields Various display devices such as organic light emitting diodes (OLEDs) are being utilized.

Recently, a display device provides a three-dimensional (3D) image that is three-dimensional (3D) view, feel and enjoy transcending space and time.

The 3D image driving device may include, for example, a display panel to which a patterned retarder is adhered and a special glasses to which spectacle retardation film is adhered to provide a 3D image. Through this, the observer can see the left eye image and the right eye image separately, so that the 3D stereoscopic image can be felt.

However, a general 3D image display apparatus uses only polarized glasses suitable for one mode display panel regardless of various display panel modes (for example, TN mode, S-IPS, H-IPS). Accordingly, when the viewer views the 3D image of the display panel of another mode using polarized glasses suitable for a certain mode, problems such as color difference generation, brightness, and crosstalk increase are caused.

Problems of a general 3D image display device will be described with reference to FIGS. 1 and 2.

FIG. 1 is a view schematically showing a display panel of three modes and one type of polarizing glasses as an example, and FIG. 2 is a problem of a general 3D image display apparatus using a poincare sphere. That is, the color shift phenomenon and the light leakage phenomenon in the side of the display panel are illustrated.

As shown in FIG. 1, the display panel may be classified into a TN mode, an S-IPS mode, or an H-IPS mode according to the polarization axis of the polarizing film 11 of the display panel and the optical axis of the patterned retarder 12. have.

First, in the case of the TN mode display panel, the polarization axis of the polarizing film 11 forms about 45 degrees, and the optical axis of the patterned retarder 12 is based on the horizontal line, that is, the X axis of the left eye retarder L. About 0 degrees is about 90 degrees for the right eye retarder (R).

In the case of the S-IPS mode display panel, the polarization axis of the polarizing film 11 is about 90 degrees, and the optical axis of the patterned retarder 12 is about 45 degrees based on the X axis in the left eye retarder L. The right eye retarder (R) is about 135 degrees with respect to the X axis.

In the case of the H-IPS mode display panel, the polarization axis of the polarizing film 11 is about 0 degrees, and the optical axis of the patterned retarder 12 is about 135 degrees based on the X axis of the left eye retarder L. The right eye retarder (R) is about 45 degrees with respect to the X axis.

However, as for the polarizing glasses 13, only the polarizing glasses 13 adapted to the S-IPS mode, for example, are used regardless of the mode of the display panel.

As such, when the polarizing glasses 13 suitable for the S-IPS mode are used regardless of the mode of the display panel, no problem occurs when viewing 3D images of the S-IPS mode display panel. When viewing the 3D image of the panel and the display panel of the H-IPS mode, problems such as color difference and crosstalk increase occur.

First, FIG. 2 shows the polarization axis of the polarizing film 11 of the display panel and the optical axis of the patterned retarder 12, the optical axis of the spectacle retardation film 13a of the polarizing glasses 13 and the polarization axis of the spectacle polarizing film 13b. Is shown schematically, and the direction of movement of light in such a structure is schematically shown using a poincare sphere.

Here, the black optical path when the optical axis of the patterned retarder 12 of the display panel and the spectacle retardation film 13a of the polarizing glasses 13 is suitable to each other, and the patterned retarder 12 of the display panel and the spectacle phase difference The black optical paths in the case where the optical axis of the film 13a is inappropriate are shown differently.

Specifically, when the optical axis of the patterned retarder 12 of the display panel and the optical axis of the spectacle retardation film 13a are suitable for each other, the red, green, and blue light are emitted from the first display panel (1). In the E2, the phases are substantially equal to each other and are gathered at one point of the equatorial region of Poangkareg. In the state (2) passing through the patterned retarder 12, phase differences occur according to the wavelength and are separated into three points. In the state 3 passing through the spectacle retardation film 13a of the spectacles 13, the light becomes vertically polarized again and gathers at the original equator point, thereby failing to pass through the spectacles polarizing film 13b and expressing perfect black.

However, when the optical axis of the patterned retarder 12 of the display panel and the optical axis of the spectacle retardation film 13a of the polarizing glasses 13 are incompatible with each other, red, green, and blue light are emitted from the first display panel. In the state (1), the phases have substantially the same phase and are gathered at one point of the Poang Karegu. In the state (2) passing through the patterned retarder 12, the phase difference occurs according to the wavelength and is separated into three points. In the state (3), which finally passed through the eyeglass retardation film 13a of the polarizing glasses 13, the phase difference was not returned to the original point, and the phase difference was further increased to be separated into three more spaced points of the Poangaregu. The optical polarization film 13b of (13) is not completely absorbed, and light leakage occurs.

That is, when the optical axis of the patterned retarder 12 and the optical axis of the spectacle retardation film 13a of the polarizing glasses 13 are inadequate, they do not return to their original points, and red, green, and blue wavelengths are dispersed at different points. Will be moved. In this case, the phase difference of the red, green, and blue wavelengths is caused by the green color (550 nm) when the patterned retarder 12 and the glasses retardation film 13a are designed despite the differences in the red and green blue wavelengths. This is because λ / 4 (137.5 nm) is set at about 125 nm. This is for color difference correction.

Table 1 shows changes in luminance, crosstalk, and color difference when viewing 3D images of three modes of display panel using one type of polarized glasses. Here, the polarizing glasses are suitable for the S-IPS mode display panel.

As shown in Table 1, changes in luminance, crosstalk, and color difference of the S-IPS mode display panel hardly occur. This is because the optical axis of the display panel and the optical axis of the polarizing glasses are adapted.

However, in the case of the TN mode display panel and the H-IPS mode display panel, the luminance, crosstalk, and color difference change appear much higher than in the S-IPS mode display panel. This is because the display panel and the polarizing glasses are not adapted.

This problem occurs because the display panel has various modes as described above, whereas polarized glasses are adapted to one display panel.

In order to solve this problem, polarizing glasses suitable for each display panel should be manufactured. However, this method has problems such as an increase in production cost and a decrease in productivity.

The present invention has a problem to provide a three-dimensional stereoscopic image display device having a wideband function.

In order to achieve the above object, the present invention provides a display panel for displaying a left eye image and a right eye image; A polarizing film formed on the display panel; A patterned retarder formed on the polarizing film, the patterned retarder including a left eye region to make the left eye image a first polarization state, and a right eye region to make the right eye image a second polarization state; The retarder provides a display device including a half wave plate (HWP) bonded to the polarizing film and a quarter wave plate (QWP) formed on the half wave plate.

The optical axis of the bi-wavelength plate in the left eye region and the right eye region forms 22.5 degrees and -22.5 degrees or -22.5 degrees and 22.5 degrees, respectively, with the polarization axis of the polarizing film.

The optical axis of the quarter wave plate forms 65 degrees to 105 degrees with the polarization axis of the polarizing film.

The quadrant plate is formed of A-plates.

A display panel displaying a left eye image and a right eye image; A polarizing film formed on the display panel; A patterned retarder formed on the polarizing film, the patterned retarder including a left eye region to make the left eye image a first polarization state, and a right eye region to make the right eye image a second polarization state; The retarder includes a quadrature plate, and the quadrature plate has a phase difference of 137 nm.

A display panel displaying a left eye image and a right eye image; A patterned retarder including a left eye region for causing the left eye image to be in a first polarization state, and a right eye region for causing the right eye image to be in a second polarization state; Selectively passing the left eye image and right eye image, the left eye and right eye glasses retardation film, and the left eye and right eye glasses including polarizing glasses including polarizing glasses corresponding to the right eye glasses retardation film, respectively, the left eye and right eye The spectacle retardation film provides a display device including a quarter wave plate, and a half wave plate interposed between the quarter wave plate and the spectacle polarizing film.

The optical axis of the binary wavelength plate of the left eye and right eye glasses phase shift films is 10 degrees to 30 degrees, or -10 degrees to -30 degrees, respectively, or -10 degrees to -30 degrees, or 10 degrees to 30 degrees, respectively. To achieve.

The optical axis of the quarter wave plate forms 65 to 105 degrees.

The quadrant plate is formed of A-plates.

The display device according to the present invention provides a wide band patterned retarder and a wide band polarized glasses, thereby providing an effect of conveniently viewing a three-dimensional stereoscopic image.

In addition, the present invention provides polarizing glasses compatible with various display panel modes, thereby eliminating the need to manufacture polarizing glasses for each display panel mode, thereby reducing production costs and increasing productivity.

1 is a view schematically illustrating a display panel and polarizing glasses of various modes.
FIG. 2 is a diagram illustrating a problem occurring in a general three-dimensional display device by using Poangcare District.
3 is a schematic view of a display device according to an embodiment of the present invention;
4 is a cross-sectional view showing a wideband optical film according to a first embodiment of the present invention.
5A and 5B are a cross-sectional view and a plan view of a wideband patterned retarder according to a first embodiment of the present invention.
6 is a cross-sectional view of the patterned retarder according to the second embodiment of the present invention.
7 is a view showing a wideband polarizing glasses according to a third embodiment of the present invention.
8A to 8C are simulation results showing various numerical values of three-dimensional stereoscopic images in various combinations of the first to third embodiments of the present invention.

Hereinafter, with reference to the drawings will be described an embodiment of the present invention.

3 is a diagram schematically illustrating a 3D stereoscopic image display device according to an embodiment of the present invention.

As illustrated, the display device 100 according to the embodiment of the present invention includes a display panel 200, a polarizing film 210, a patterned retarder 220, and a polarizing glasses 300. .

Here, the polarizing film 210, the patterned retarder 220, and the polarizing glasses 300 are used as a stereoscopic image driving element.

The display panel 200 may include a cathode ray tube (CRT), a plasma display panel (PDP), a liquid crystal panel, an organic light emitting diode panel, or the like. have.

Hereinafter, the liquid crystal panel 200 will be described by way of example for convenience of description.

The liquid crystal panel 200 includes two substrates facing each other, for example, an array substrate and an opposing substrate, and a liquid crystal layer positioned between the two substrates.

In the array substrate of the liquid crystal panel 200, a plurality of gate lines extending in a first direction and a plurality of data lines extending in a second direction cross each other, and a plurality of pixels arranged in a matrix form are arranged. Is defined.

Each pixel is formed with a thin film transistor connected to a gate wiring and a data wiring. The thin film transistor is connected to the pixel electrode. Meanwhile, a common electrode is formed corresponding to the pixel electrode. When a data voltage is applied to the pixel electrode and a common voltage is applied to the common electrode, an electric field is formed therebetween to drive the liquid crystal. The liquid crystal positioned between the pixel electrode, the common electrode, and these electrodes constitutes a liquid crystal capacitor.

Here, the common electrode is formed on the opposing substrate in the vertical electric field driving method such as the twisted nematic (TN) mode and the vertical alignment (VA) mode, and the same as the in plane switching (IPS) mode and the fringe field switching (FFS) mode. In the horizontal electric field driving method, the pixel electrode is formed on the array substrate together with the pixel electrode.

On the other hand, a storage capacitor is further configured in each pixel, which serves to store the data voltage applied to the pixel electrode until the next frame.

On the opposite substrate of the liquid crystal panel 200, for example, red, green, and blue color filters corresponding to each pixel and a black matrix are formed.

Although not shown here, a polarizing film is attached to the rear surface of the array substrate (a portion facing the backlight), and an alignment layer is formed at the portion in contact with the liquid crystal layer. In addition, a polarizing film 210 is attached to the entire surface of the counter substrate (a portion facing the patterned retarder 220), and an alignment layer is formed at the portion in contact with the liquid crystal layer.

In addition, the liquid crystal panel 200 alternately displays the left eye image L and the right eye image R in row line units. That is, the left eye image L and the right eye image R are alternately displayed in a line by line form. Specifically, if the left eye image L is displayed in the odd-numbered row line of the liquid crystal panel 200, the right eye image R is displayed in the even-numbered row line.

The polarizing film 210 transmits only a specific linearly polarized light from the light incident through the liquid crystal layer of the liquid crystal panel 200. That is, the polarizing film 210 serves as a polarizer. Here, the polarizing film 210 is adhered to the counter substrate and the patterned retarder 220 of the liquid crystal panel 200 between the counter substrate and the patterned retarder 220 of the liquid crystal panel 200.

The patterned retarder 220 is used as a polarization split optical medium. It functions as an optical means for modulating the linearly polarized light emitted from the polarizing film 210 to have two different polarization directions on a pixel, row, or column basis.

For example, the phase retardation of the patterned retarder 220 is set to quarter wavelength (λ / 4), and the optical axis of the patterned retarder 220 is used as the polarizing film of the display device 100. The polarization direction of the linearly polarized light emitted from 210 is +45 degrees (220a) and -45 (+135) degrees 220b, respectively. Accordingly, linearly polarized light is modulated into left circular polarization (LCP) and right circular polarization (RCP), respectively.

In the exemplary embodiment of the present invention, linearly polarized light emitted from the polarizing film 210 is modulated into circularly polarized light so as to have two different polarization directions on a row line basis. Specifically, for example, the left eye image emitted from the odd-numbered row line has left circular polarization, and the right eye image emitted from the even-numbered row line has right circular polarization.

In addition, in the manufacture of the patterned retarder 220, a coating of the reactive mesogens (RM) on the substrate (coating), orienting the pattern to have a different optical axis, and then photocrosslinked to form a liquid crystal polymer film Pattern alignment method is used.

Here, the substrate on which the reactive liquid crystal monomer is coated may be a glass or film substrate.

In an embodiment of the present invention, a film patterned retarder (FPR) using a film substrate may be used.

The polarizing glasses 300 serve to feel the image displayed on the liquid crystal panel 200 as a stereoscopic image. Specifically, the left eyeglasses of the polarizing glasses 300 pass only the left circularly polarized left image (or right circularly polarized light), for example, and the right eyeglasses only pass the right circularly polarized right image (or left circularly polarized light), for example. .

Accordingly, the observer wearing the polarizing glasses 300 sees only the left eye image with the left eye, for example, and sees only the right eye image with the right eye, so that the image displayed on the liquid crystal panel 200 is felt as a stereoscopic image.

To this end, the polarizing glasses 300 may include, for example, a spectacle polarizing film 310 and a spectacle retardation film 320.

The spectacle retardation film 320 passes through the patterned retarder 220 of the liquid crystal panel 200 to modulate the left circularly polarized light or the right circularly polarized light into linearly polarized light.

The spectacles polarizing film 310 is used as a polarization split optical medium. That is, it functions as optical means for modulating the linearly polarized light emitted from the glasses retardation film 320 to have different polarization directions in the left eye and the right eye.

The backlight (not shown) serves to supply light to the liquid crystal panel 200. As the backlight, a Cold Cathode Fluorescent Lamp (CCFL), an External Electrode Fluorescent Lamp (EEFL), a Light Emitting Diode (LED), or the like may be used.

As described above, the patterned retarder 220 and the glasses retardation film 320 is used as a polarization splitting and modulating optical medium, so that the viewer can feel a three-dimensional stereoscopic image.

Here, the patterned retarder 220 and the glasses retardation film 320 according to an embodiment of the present invention provides a wideband function. That is, the wide band patterned retarder 220 and the wide band eyeglass retardation film 320 are configured.

The wideband function refers to completely modulating linearly flattened light into circularly polarized light or circularly polarized light into linearly polarized light for all wavelengths. Specifically, the red, green, and blue wavelengths after passing through the patterned retarder 220 are all 1 / 4-wavelength (λ / 4) retardation, and are modulated to complete circularly polarized light, and the spectacle phase difference film 320 is used. The red, green, and blue wavelengths that pass through each have a quarter-wave (λ / 4) phase difference, which is modulated to complete linear polarization.

Hereinafter, the first to third embodiments of the present invention for providing a wideband function will be described in more detail.

≪ Embodiment 1 >

Hereinafter, the wideband implementation method according to the first embodiment of the present invention will be described with reference to FIG. 4.

FIG. 4 is a cross-sectional view illustrating an optical film after applying a wide band according to a first embodiment of the present invention. FIG. 4 is a diagram illustrating an optical film for representing one image of a left eye image and a right eye image. That is, the patterned retarder or the glasses retardation film of FIG. 3 is one example.

As shown in FIG. 4, the optical film OF used in the patterned retarder (220 in FIG. 3) and the glasses retardation film (320 in FIG. 3) before the wide band is applied is divided into four-wavelength plates Q1 and QWP. Use only quarter wave plate. In addition, the optical axis of the quarter wave plate Q1 forms an angle of 45 degrees with respect to the polarization axis of the polarizing film 210 of FIG. 3. That is, the optical film (OF) before the wide band is applied, the optical axis of the quarter wave plate (Q1) is configured to form an angle of 45 degrees with the polarization axis of the polarizing film (210 in FIG. Circularly polarized light is modulated by linearly polarized light and linearly polarized light is modulated by circularly polarized light.

The wavelengths of red, green, and blue after passing through the optical film (OF) are different in phase difference due to different refractive indices, and thus all wavelengths of red, green, and blue are completely 1/4 wavelengths (λ / 4). ) It is not delayed and is distributed at each point of the poincare sphere without being collected. That is, the optical film OF cannot completely modulate linearly polarized light and circularly polarized light into linearly polarized light for all wavelengths.

Here, Poangaregu is intended to intuitively grasp the polarization transmission characteristics of the light, for example, is composed of points in the Cartesian coordinates of the equation of the ball having a radius of 1 in three-dimensional space. Using this, optical characteristics are analyzed geometrically. That is, the optical characteristics are analyzed through the optical path.

All points on the equatorial line of Poangcare District correspond to linearly polarized light, with the North Pole corresponding to the right circularly polarized light and the South Pole to the left circularly polarized light. All points in the northern hemisphere correspond to right elliptical polarization and all points in the southern hemisphere correspond to left elliptical polarization.

Hereinafter, an optical film to which a wide band is applied will be described. In this case, for convenience of description, the optical film to which the wide band is applied is referred to as a wide band optical film (WOF).

A wideband optical film (WOF) according to an embodiment of the present invention uses a quarter wave plate (QWP) and a half wave plate (HWP) together. Specifically, the quarter wave plate QWP and the half wave plate HWP are formed to overlap each other, for example, in the upper and lower portions. Accordingly, the red, green, and blue wavelengths pass through both the quarter wave plate (QWP) and the half wave plate (HWP).

At this time, the optical axis of the quarter wave plate (QWP) may form an angle of about 65 degrees to about 105 degrees with the polarization axis of the polarizing film 210, that is, the linearly polarized light emitted from the polarization film 210, and the optical axis of the half wave plate (HWP) is polarized. An angle of about 10 degrees to about 30 degrees or about −10 degrees to about −30 degrees may be formed with the polarization axis of the film 210, that is, the polarization direction of the linearly polarized light emitted. Here, the polarization axis of the polarizing film 210 may be a horizontal direction, for example.

Light passes through both the quarter-wave plate (QWP) and the half-wave plate (HWP), so that all of the red, green, and blue wavelengths are completely modulated from linearly polarized to circularly polarized or from circularly to linearly polarized. That is, the phase difference of red, green, and blue wavelengths generated by passing through the quarter wave plate QWP is compensated by passing through the half wave plate HWP.

A description is given with reference to Poangcurrygu. For convenience of explanation, a case of modulating linearly polarized light into circularly polarized light will be described as an example.

First, red, green, and blue light (R, G, B) before passing through the dividing wavelength plate (HWP), that is, after passing through the polarizing film 210, is collected at one point of the equatorial point of Poangkaregu. For example, the light is collected at a point S1 corresponding to the polarization axis of the polarizing film 210.

The red, green, and blue light (R, G, B) gathered at one point passes through the dividing wave plate (HWP), and is moved to another point (S2r, S2g, S2b) of Poangcare District. That is, the binary wavelength plate HWP causes the phase difference of light to be 1/2 wavelength lambda / 2.

At this time, as the refractive indexes of the red, green, and blue light (R, G, B) are different, different phase differences occur, and after passing through the HWP, the red, green, and blue light (R, G, B, B) All are not fully delayed at half wavelength (λ / 2) but are dispersed.

Specifically, for example, the red wavelength (R) has the smallest phase difference and is located at S2r, which is closer than the S2g point, which is the 1/2 wavelength (λ / 2) point, and the green wavelength (G) is 1 completely. / 2 wavelength (λ / 2) phase difference occurs and is located at the S2g point, the blue wavelength (B) has the largest phase difference to be located at the S2b point farther than the S2g point, which is 1/2 wavelength (λ / 2) point do.

The reason why the red, green, and blue light (R, G, B) are distributed to each other is that when designing the phase difference of the optical film, one half of the wavelength, for example, the green wavelength (G) It is because it is designed so that it may become wavelength (lambda / 2). However, since the refractive indices of the red, green, and blue light (R, G, B) are different from each other, the phase difference of the red, green, and blue light (R, G, B) after passing through the optical film is different.

More specifically, it can be expressed as <phase difference = refractive index anisotropy of a corresponding wavelength * thickness of an optical film>, where refractive index anisotropy with respect to red, green, and blue wavelengths is represented by red wavelength (R) <green wavelength (G) <blue The wavelength B is obtained. Therefore, when the optical film is designed such that the phase difference is 1/2 wavelength (λ / 2) based on the light of the green wavelength (B), the phase difference with respect to the light of the red wavelength (R) after passing through the optical film is 1 It is smaller than 1/2 wavelength lambda / 2, and the phase difference of blue wavelength B becomes larger than half wavelength lambda / 2.

Thus, the red, green, and blue light R, G, and B, which are generated by different phase differences and are dispersed, are collected at a point S3 that becomes circularly polarized light while passing through the quarter-wave plate QWP.

As described above, after passing through the quarter-wave plate (QWP), the phase difference with respect to the light of the red wavelength (R) has the smallest value, the smallest distance is moved to the circular polarization point, and the green wavelength ( The phase difference of G) becomes a full quarter wavelength (λ / 4) and is collected at the circularly polarized point, and the phase difference of the blue wavelength (B) has the greatest value. .

That is, in the embodiment of the present invention, the phase difference between the red, green, and blue lights R, G, and B is compensated using the dividing wave plate HWP.

At this time, the optical axis of the most optimized quarter-wave plate (QWP) in consideration of the red, green blue light (R, G, B) may form an angle of about 65 degrees to about 105 degrees with the polarization axis of the polarizing film 210. The optical axis of the HWP may form an angle of about 10 degrees to about 30 degrees with the polarization axis of the polarizing film 210.

Hereinafter, the patterned retarder to which the wide band optical film is applied will be described in detail with reference to FIGS. 5A and 5B.

5A is a cross-sectional view of the patterned retarder to which the wideband optical film is applied, and FIG. 5B is a plan view of the patterned retarder to which the wideband optical film is applied.

First, referring to FIG. 5A, the patterned retarder 220 may include a retarder layer 221, a base film 222, and a compensation layer 223.

For example, the base film 222 is interposed on the retarder layer 221 and the compensation layer 223 is interposed on the base film 222. In addition, although not shown, an adhesive layer may be further formed below the retarder layer 221, and the retarder layer 221 may be attached to the polarizing film 210 of FIG. 3 with the adhesive layer therebetween.

The retarder layer 221 includes a left eye retarder Rl and a right eye retarder Rr that are alternately disposed.

In addition, the retarder layer 221 is formed of the first half-wave plate HWP1. At this time, the optical axis of the first half-wave plate HWP1 forms an angle of about 22.5 degrees or about -22.5 (107.5) degrees with the polarization axis of the polarizing film 210 of FIG.

Specifically, for example, the right eye retarder (Rr) is a phase difference of 1/2 wavelength (λ / 2), and the optical axis is composed of about 22.5 degrees with the polarization axis of the polarizing film (210 in Fig. 3), left eye retarder (Rl) sets the phase difference to 1/2 wavelength (λ / 2), and configures the optical axis at about -22.5 (107.5) degrees with the polarization axis of the polarizing film (210 in FIG. 3).

The optical axis of the dividing wavelength plate HWP of the wide band optical film WOF has a value of about 10 degrees to about 30 degrees with the polarizing film 210 of FIG. 3.

The first half-wave plate HWP1 of the patterned retarder 220 according to the first embodiment of the present invention may have a value of about 10 degrees to about 30 degrees. At this time, it is preferable to limit the optical axis of the first half-wave plate HWP1 to about 22.5 degrees.

Here, the optical axis of the first half-wave plate HWP1 is limited to about 22.5 degrees to match the angle of the first quarter-wave plate QWP1. That is, the value 22.5 degrees of the optical axis of the first half-wave plate HWP1 in the patterned retarder 220 is the most optimized value in consideration of the angle of the first quarter-wave plate QWP1.

Specifically, when the optical axis of the first half-wave plate HWP1 is not formed at about 22.5 degrees, the left eye retarder Rl of the first half-wave plate QWP1 is formed. Corresponding to the right eye and the right eye retarder (Rr) to have two different values. That is, when the optical axis of the first half-wave plate (HWP1) is formed to about 22.5 degrees, the optical axis of the first quarter-wave plate (QWP1) is the left eye retarder (Rl) and the right eye retarder of the first half-wave plate (HWP1). It is not necessary to change it in correspondence with (Rr). Accordingly, the first quarter wave plate QWP1 may be formed by using one plate, thereby reducing the production cost.

The compensation layer 223 is formed of the first quarter wave plate QWP1. The optical axis of the first quarter wave plate QWP1 at this time has a range of values of the quarter wave plate (QWP of FIG. 4) of the wide band polarizing film (WOF of FIG. 4). That is, the optical axis of the first quarter wave plate QWP1 forms an angle of about 65 degrees to about 105 degrees with the polarization axis of the polarizing film 210 of FIG. 4.

Here, the first quarter wave plate QWP1 may be formed of, for example, an A-plate. A-plate may be used, for example, cycloolefin polymer film, polycarbonate film, UV curing horizontal or horizontal alignment liquid crystal film, polystyrene resin, polyethylene terephthalate.

Alternatively, the first quarter wave plate QWP1 may be formed using the base film 222.

Referring to FIG. 5B, the patterned retarder 220 may include a left eye retarder Rl and a right eye retarder Rr, and the left eye retarder Rl and the right eye retarder Rr may include a liquid crystal panel (FIG. 3,200 are alternately arranged along the vertical direction.

Here, for example, the optical axis of the right eye retarder Rr is about 22.5 degrees with the polarization axis of the polarizing film 210 of FIG. 3, and the optical axis of the left eye retarder Rl is with the polarization axis of the polarizing film 210 of FIG. 3. It is about -22.5 degrees.

Accordingly, the light of the left eye image passing through the left binocular retarder Rl and the first quarter wave plate (QWP1 in FIG. 5A), which is the first bi-wavelength plate (HWP1 in FIG. 5A), having an optical axis of 22.5 degrees, is modulated into left circularly polarized light. The light of the right eye image passing through the right binocular retarder Rr and the first quadrant wavelength plate (QWP1 of FIG. 5A) having an optical axis of -22.5 degrees (HWP1 of FIG. 5A) is modulated into right circularly polarized light.

For example, the right circular polarization will be described in detail. The output light of the right eye image emitted from the polarizing film 210 of FIG. 3 includes a right circular retarder Rr formed of the first half wavelength plate HWP1 having an optical axis of 22.5 degrees. The phase difference becomes about 1/2 wavelength (λ / 2) as it passes. In this case, the wavelengths of the red, green, and blue light emitted from the right eye image (R, G, and B of FIG. 4) are dispersed as described above.

The red, green, and blue wavelengths (R, G, and B shown in FIG. 4) dispersed in this way pass through the first quadrant plate QWP1 and are gathered at the right circular polarization point to become a full right polarized light.

&Lt; Embodiment 2 >

Hereinafter, a second embodiment of the present invention will be described.

First, the description of the same or similar parts as the first embodiment of the present invention will be omitted.

6 is a cross-sectional view of a patterned retarder capable of wide band.

The patterned retarder 220 may include a retarder layer 221 and a base film 222.

Here, the optical axis of the second quarter wave plate QWP2 which is the retarder layer 221 is disposed at +45 degrees and -45 (+135) degrees with the polarization direction of the linearly polarized light emitted from the polarizing film 210, respectively.

At this time, the phase difference in the patterned retarder 220 is set to 1/4 wavelength (λ / 4).

Here, the value of the quarter wavelength (λ / 4) is set to about 137 nm based on 550 nm. In general, the value of 1/4 wavelength (λ / 4) is set to about 125 nm based on light of 550 nm wavelength, which means that a full 1/4 wavelength (λ / 4) is obtained for all wavelengths, that is, for green wavelengths. Linear polarization cannot be completely modulated to circular polarization.

Therefore, in the second embodiment of the present invention, the value of the quarter wavelength? / 4 is set to about 137 nm based on 550 nm, so that linearly polarized light can be completely modulated to circularly polarized light.

Third Embodiment

Hereinafter, a third embodiment of the present invention will be described.

First, the description of the same or similar parts as the first embodiment of the present invention will be omitted.

7 is a view showing a polarizing glasses to which the wideband optical film of the present invention is applied.

As shown in FIG. 7, the polarizing glasses 300 may include the glasses polarizing film 310 and the glasses retardation film 320.

The spectacles polarizing film 310 is used as a polarization split optical medium. That is, the linearly polarized light emitted from the glasses retardation film 320 may transmit only specific linearly polarized light different from the left eye and the right eye.

The glasses retardation film 320 passes through the patterned retarder 220 of the liquid crystal panel 200 to modulate the left circularly polarized light or the right circularly polarized light into a specific line. That is, the glasses retardation film 320 serves to modulate the circularly polarized light into linearly polarized light.

In the spectacle retardation film 320 according to the third embodiment of the present invention, a wide band optical film (WOF of FIG. 4) is applied.

Specifically, the spectacle retardation film 320 is composed of a third quarter wave plate QWP3 and a third half wave plate HWP3.

The optical axis of the third quarter wave plate QWP3 may form an angle of about 65 degrees to about 105 degrees. For example, the angle may be about 65 degrees to about 105 degrees with respect to the horizontal direction.

Here, the third quarter wave plate QWP3 may be formed of, for example, an A-plate. A-plate may be used, for example, cycloolefin polymer film, polycarbonate film, UV curing horizontal or horizontal alignment liquid crystal film, polystyrene resin, polyethylene terephthalate.

The optical axis of the third half wave plate HWP3 may form an angle of about 10 degrees to about 30 degrees or about −10 degrees to about −30 degrees. For example, the angle may be about 10 degrees to about 30 degrees or about −10 degrees to about −30 degrees with respect to the horizontal direction.

Specifically, for example, the optical axis of the third half-wave plate (HWP3) of the right glasses 302 may form an angle of about 10 degrees to about 30 degrees, the third half-wave plate (HWP3) of the left eyeglasses (301) The optical axis of may form an angle of about -10 degrees to about -30 degrees.

Accordingly, the left eye image passing through the patterned retarder (220 in FIG. 3) is modulated into complete linear polarization while passing through the third quarter wave plate QWP3 and the third dividing wave plate HWP3 of the left eyeglass 301. The right eye image passing through the patterned retarder (220 in FIG. 3) is modulated into complete linear polarization while passing through the third quarter wave plate QWP3 and the third dividing wave plate HWP3 of the right eyeglass 301.

Hereinafter, the effects of the first to third embodiments of the present invention will be described with reference to FIGS. 8A to 8C and Table 2.

8A to 8C are simulations showing the transmittance of light in various combinations of the first to third embodiments of the present invention.

FIG. 8A is a simulation result showing the light transmittance when the general polarized glasses and the patterned retarder of the second embodiment are combined, and FIG. 8B shows the wideband polarized glasses of the third embodiment and the patterned retarder of the second embodiment. FIG. 8C is a simulation result showing the light transmittance when the wideband patterned retarder of the first embodiment is combined with the wideband polarizing glasses of the third embodiment.

First, referring to FIG. 8A, when the general polarized glasses and the patterned retarder 220 of FIG. 6 are combined, regardless of the display panel mode, for example, TN mode, S-IPS, or H-IPS When the wavelength of light is about 530 nm, the light transmittance of black becomes 0%. Accordingly, the display panel expresses perfect black. In addition, the light transmittance of white at a wavelength of about 530 nm becomes 30%, and the display panel expresses perfect white.

However, when the wavelength of light is 530 nm or more, the light transmittance of black in TN and H-IPS except for S-IPS is more than 0%, and the display panel does not express perfect black. In addition, since the light transmittance of white is less than 30%, the display panel does not realize perfect white.

Referring to FIG. 8B, when the wideband polarizing glasses (FIG. 7) and the patterned retarder (220 in FIG. 6) of the second embodiment are combined, the light transmittance of black becomes 0% to about 600 nm, and the display panel is completely Express black. In addition, the light transmittance of white in the TN mode and the S-IPS mode display panel mode is lowered to a very fine value of less than 30% only when it is about 700 nm or more. In other words, completely white is implemented in the H-IPS mode display panel, and only a very small difference occurs in the TN mode and S-IPS mode display panel.

Referring to FIG. 8C, when the patterned retarder (FIG. 5A) of the first embodiment and the wideband polarizing glasses (FIG. 7) of the third embodiment are combined, the light transmittance of the black becomes 0% to about 630 nm, and thus, the display panel. Expresses full black. In addition, since the transmittance of white light is from 30 nm to 30% or more, the display panel expresses perfect white.

That is, when the wide band patterned retarder and the wide band polarized glasses are combined, the light transmittance is excellent and the color shift phenomenon is least generated regardless of the mode of the display panel.

Referring to Table 2, it can be seen that when the wideband polarized glasses and the wideband patterned retarder are combined, the crosstalk is the least and the color difference is the least.

In addition, since the white luminance is about 103.8% regardless of the display panel mode, the display panel expresses a constant white color.

As described above, the first to third embodiments of the present invention provide a 3D display device capable of realizing a complete 3D image regardless of the mode of the display panel and the wavelength of light. Specifically, the patterned retarder modulates linearly polarized light completely into circularly polarized light, and polarized glasses completely modulates circularly polarized light into linearly polarized light.

Accordingly, one kind of compatible polarized glasses can be used regardless of the mode of the display panel, so that viewers can conveniently view 3D images. In addition, the polarizing glasses need not be manufactured to suit each display panel mode, thereby reducing manufacturing costs and increasing productivity.

The embodiments of the present invention described above are examples of the present invention, and modifications can be made freely within the scope of the present invention. Accordingly, the invention includes modifications of the invention within the scope of the appended claims and their equivalents.

200: display panel
210: polarizing film 220: patterned retarder
300: polarized glasses 310: glasses polarizing film
320: glasses retardation film WOF: wide band optical film
QWP: Quarter-wave plate HWP: Binary-wave plate

Claims (9)

A display panel displaying a left eye image and a right eye image;
A polarizing film formed on the display panel;
A patterned retarder formed on the polarizing film, the patterned retarder including a left eye region to make the left eye image a first polarization state, and a right eye region to make the right eye image a second polarization state,
The patterned retarder includes a bipolar wavelength plate (HWP) bonded to the polarizing film, and a quarter wave plate (QWP) formed on the bipolar wavelength plate.
Display device.
The method of claim 1,
The optical axis of the binary wavelength plate in the left eye region and the right eye region forms 22.5 degrees and -22.5 degrees or -22.5 degrees and 22.5 degrees, respectively, with the polarization axis of the polarizing film, respectively.
Display device.
The method of claim 1,
The optical axis of the quarter wave plate forms 65 to 105 degrees with the polarization axis of the polarizing film.
Display device.
The method of claim 1,
The quadrant plate is formed of A-plate
Display device.
A display panel displaying a left eye image and a right eye image;
A polarizing film formed on the display panel;
A patterned retarder formed on the polarizing film, the patterned retarder including a left eye region to make the left eye image a first polarization state, and a right eye region to make the right eye image a second polarization state,
The patterned retarder includes a quarter wave plate,
The phase difference of the quarter wave plate is 137 nm
Display device.
A display panel displaying a left eye image and a right eye image;
A patterned retarder including a left eye region for causing the left eye image to be in a first polarization state, and a right eye region for causing the right eye image to be in a second polarization state;
And a polarizing eyeglass that selectively passes the left eye image and the right eye image, and includes left and right eye retardation films, and left and right eye polarization films corresponding to the left and right eye retardation films, respectively.
The left eye and right eye glasses retardation films include a quarter wave plate, and a half wave plate interposed between the quarter wave plate and the spectacle polarizing film.
Display device.
The method according to claim 6,
The optical axis of the binary wavelength plate of the left eye and right eye glasses phase shift films is 10 degrees to 30 degrees, or -10 degrees to -30 degrees, respectively, or -10 degrees to -30 degrees, or 10 degrees to 30 degrees, respectively. Forming
Display device.
The method according to claim 6,
The optical axis of the quarter wave plate forms 65 to 105 degrees.
Display device.
The method according to claim 6,
The quadrant plate is formed of A-plate
Display device.

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