KR20130020299A - 3d display having wide view angle using prism - Google Patents

Abstract

PURPOSE: A three-dimensional Display is provided to provide wide view angle in a short distance watching. CONSTITUTION: A patterned retarder comprises a first retarder and a second retarder located at the front side of a display panel. A prism is positioned in the border area of the second retarder and the first retarder. A black strip is formed at the position corresponding to the border area of the second retarder and the first retarder. A black matrix black matrix is formed adjacent to the black strip.

Description

3D Display Having Wide View Angle Using Prism}

The present invention relates to a patterned retarder type stereoscopic image display device having a wide viewing angle. In particular, the present invention relates to a patterned retarder type stereoscopic image display device that realizes a wide viewing angle by inducing light causing cross-talk to a viewing angle outside using a prism.

Recently, with the development of various video contents, a display device capable of selectively implementing 2D images and 3D images has emerged. In order to realize a 3D image, the display device uses a stereoscopic technique or an autostereoscopic technique.

An example of the dual glasses method is a three-dimensional image display device in which a patterned retarder is disposed on a display panel. This 3D image display device realizes a 3D image by using the polarization characteristics of the patterned retarder and the polarization characteristics of the polarized glasses worn by the user. Its small size and excellent brightness have the advantage of excellent image quality.

1 is an exploded perspective view showing the structure of a patterned retarder type three-dimensional imaging system according to the prior art. The patterned retarder type 3D imaging system utilizes the polarization characteristics of the patterned retarder (PR) disposed on the display panel (DP) and the polarization characteristics of the polarized glasses PG worn by the user. To implement stereoscopic images.

The patterned retarder type 3D imaging system includes a display panel DP for realizing 2D or 3D images, a patterned retarder PR attached to the front surface of the display panel DP, and polarized glasses PG. And the like. The display panel DP is a display device for displaying 2D image and 3D image data, and includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel, PDP), and flat panel display devices such as electroluminescence devices (EL) and electrophoretic display devices (EPD), including inorganic electroluminescent devices and organic light emitting diodes (OLEDs). Can be. Hereinafter, the display panel DP will be described based on the display panel of the liquid crystal display device.

The display panel DP includes liquid crystal cells arranged in a matrix by a cross structure of data lines and gate lines. A pixel array including data lines, gate lines, a TFT, a pixel electrode, and a storage capacitor is formed on the lower glass substrate SL of the display panel DP. The liquid crystal cells are driven by an electric field between the pixel electrodes connected to the TFT and the common electrode. The black matrix, the color filter, and the common electrode are formed on the upper glass substrate SU of the display panel DP. The upper polarizing film PU and the lower polarizing film PL are attached to the outside of the upper glass substrate SU and the lower glass substrate SL of the display panel DP.

The patterned retarder PR is attached to the outside of the upper polarizing film PU of the display panel DP. In the patterned retarder PR, unit retarders corresponding to each line having one line of pixels arranged in the horizontal direction of the display panel DP as a basic unit are arranged. For example, one unit retarder is allocated to correspond to an area of pixels commonly connected to one gate line. In particular, the first retarder RT1 is assigned to the odd lines of the patterned retarder PR, and the second retarder RT2 is assigned to the even lines of the patterned retarder PR. do. The first retarder RT1 delays the phase value of the light from the display panel DP by + λ / 4 (where λ is the wavelength of the light) to transmit the first circularly polarized light. The second retarder RT2 delays the phase value of the light from the display panel DP by -λ / 4 (actually by 3λ / 4) to transmit the second circularly polarized light. The light transmission axis of the first retarder RT1 and the light transmission axis of the second retarder RT2 are perpendicular to each other.

The polarizing glasses PG include a left eyeglass window LG having a first polarizing filter P1 and a right eyeglass window RG having a second polarizing filter P2. The first polarization filter P1 has the same polarization characteristic as that of the first retarder RT1 of the pattern retarder PR. The second polarization filter P2 has the same polarization characteristic as that of the second retarder RT2 of the pattern retarder PR.

In this structure, a 3D image may be implemented by displaying a left eye image in pixels corresponding to the first retarder RT1 and a right eye image in pixels corresponding to the second retarder RT2. Accordingly, the 3D image display apparatus as shown in FIG. 1 may implement a 3D image by spatially dividing the left eye image and the right eye image viewed by the user by differently polarizing characteristics of the left eye image and the polarization characteristic of the right eye image.

In the 3D image display apparatus using the film-type patterned retarder, the left-eye image and the right-eye image are alternately displayed in units of horizontal pixel columns, so that a cross-talk phenomenon may occur in the vertical viewing angle direction. . FIG. 2 is a cross-sectional view of the 3D image display apparatus of FIG. 1 taken along the cutting line A-A 'of FIG. 1, showing a case where crosstalk occurs.

Referring to FIG. 2, when viewing from above (or below) the frontal view, the left eye image L1 and the right eye image R1 may be simultaneously output through the first patterned retarder RT1. As a result, a crosstalk phenomenon that simultaneously passes the left eye image L1 and the right eye image R1 through the left eyeglass window LG of the polarizing glasses PG occurs. Although the black matrix BM is formed for each pixel unit constituting the flat panel display device, the size of the black matrix BM is not large enough to solve cross talk.

In order to solve the viewing angle problem in the vertical direction, a black strip BS having a wider width than the black matrix BM may be further included between the unit patterned retarders. 3 is a cross-sectional view illustrating a structure of a 3D image display device having a black strip for solving crosstalk in the display device of FIG. 1. FIG. 4 is a front view illustrating a structure of the 3D image display device having the black strip shown in FIG. 3 as viewed from the front.

Referring to FIG. 3, the black strip BS having a wider width than that of the black matrix BM is further included in an area corresponding to the unit patterned retarders RT1 and RT2. 3 illustrates a case where the black strip BS is formed inside the flat panel display panel. In some cases, it may be formed directly between the unit patterned retarder (RT1, RT2) formed on the patterned retarder film (PR).

As shown in FIG. 3, when viewing from the vertical viewing angle position by the black strip BS, the black strip BS is disposed on the optical path through which the right eye image R1 is projected onto the first patterned retarder RT1. As a result, the right eye image R1 is blocked from being projected onto the first patterned retarder RT1. As a result, when viewed from the front of the display device, when moving in a vertical direction and viewing, cross talk does not occur within a certain range.

Even when the black strip BS is formed between the patterned retarders RT1 and RT2 to prevent crosstalk between the left eye image and the right eye image, it is difficult to completely remove the crosstalk when the viewing distance is close. For example, personal information devices such as personal data appliances (PDAs), cellular phones, and smart phones often have a close viewing distance, which often results in large vertical viewing angles. do. 4 is a cross-sectional view showing a cross-talk phenomenon that occurs when the viewing distance is close.

Referring to FIG. 4, when the viewing distance is close, the left eye image is observed through the second patterned retarder RT2, which is a patterned retarder for the right eye image, in the region ⓛ, a region where the viewing angle is very large. Similarly, in the region ②, the right eye image is observed through the first patterned retarder RT1 which is a patterned retarder for the left eye image. Therefore, cross-talk occurs between the left eye image and the right eye image in the region ⓛ and the region ②. On the other hand, crosstalk does not occur in the region ③ where the black strip BS is formed.

That is, the angle of incidence θ coming into the normal region where no cross talk occurs by the sum of the regions of the black strip BS and the black matrix BM determines the viewing angle. Since the viewing angle is determined by light incident at the incident angle θ in each of the up and down directions, the viewing angle in the up (or down) direction may be defined as θ, and the overall viewing angle may be defined as 2θ.

As described above, even when the black strip BS is formed, crosstalk occurs in the near viewing display device such as a personal portable device, and crosstalk still exists in the near field beyond the viewing angle. In order to secure a wider viewing angle, a wider width of the black strip BS may be designed. However, this is not a preferable method because it causes a decrease in luminance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a three-dimensional image display device having a wide viewing angle even when viewed in close range, which is designed to overcome the above problems. Another object of the present invention is to provide a stereoscopic image display device having a wide viewing angle without causing a decrease in luminance in the front direction.

In order to achieve the object of the present invention, the 3D display device according to the present invention, the display panel; A patterned retarder having a first retarder and a second retarder positioned on a front surface of the display panel; And a prism positioned at a front surface of the patterned retarder and positioned at a boundary area between the first retarder and the second retarder.

The display panel may include a black strip formed at a position corresponding to a boundary area between the first retarder and the second retarder; And a black matrix formed adjacent to the black strip.

The area in which the black strip and the black matrix are combined may be divided into two parts based on a boundary between the first retarder and the second retarder.

The prism is disposed in an area where the black strip and the black matrix are formed.

The prism may include a base having a size corresponding to a width of an area where the black strip and the black matrix are formed; An upper edge having a magnitude less than or equal to two times the distance between the black matrix and the boundary line; And it characterized in that the trapezoid including two hypotenuses connecting the both ends of the base and the both ends of the upper side, respectively.

The prism has a base angle smaller than a viewing angle defined by the display panel and the patterned retarder.

The base angle of the prism is characterized in that greater than 0 degrees and less than 3 degrees.

The 3D display device according to the present invention forms a prism formed at a position overlapping with the black strip. The prism has a function of guiding the light of the right eye image passing through the left eye patterned retarder and the light of the left eye image passing through the right eye patterned retarder to the outside of the viewing angle. Therefore, it is possible to provide a wide viewing angle even at close viewing. And since light condensing toward the prism toward the prism in the front direction has the effect of improving front brightness. In addition, since a prism sheet which is easy to manufacture and inexpensive is used, a stereoscopic image display apparatus having a wide viewing angle having low manufacturing cost can be provided.

1 is an exploded perspective view showing the structure of a conventional patterned retarder three-dimensional imaging system.
FIG. 2 is a cross-sectional view taken along the cutting line A-A 'of FIG. 1, showing a case where crosstalk occurs in the 3D image display apparatus of FIG.
3 is a cross-sectional view illustrating a structure of a 3D video display device having a black strip for solving crosstalk in the display device of FIG. 1.
4 is a cross-sectional view showing a cross-talk phenomenon that occurs when the viewing distance is close.
5 is a cross-sectional view showing the structure of a wide viewing angle 3D image display device using a prism according to the present invention.
Fig. 6 is a view for explaining the case where the wide viewing angle 3D image display device using the prism according to the present invention operates in the 2D mode.
Fig. 7 is a view for explaining the case where the wide viewing angle 3D image display device using the prism according to the present invention operates in the 3D mode.
8 is a view showing the base angle of the prism preferred in the wide viewing angle 3D image display device having a prism according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, when it is determined that a detailed description of known functions or configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, specific embodiments of the present invention will be described with reference to FIGS. 5 to 7. 5 is a cross-sectional view showing the structure of a wide viewing angle 3D image display device using a prism according to the present invention.

Referring to FIG. 5, a wide viewing angle 3D image display apparatus using a prism according to the present invention includes a display panel DP for realizing 2D or 3D images, and a patterned retarder PR disposed on the front of the display panel DP. The prism PZ is disposed on the front surface of the patterned retarder PR, and the polarizing glasses PG.

The display panel DP has a structure in which the upper substrate SU and the lower substrate SL are bonded to each other with the liquid crystal layer LC therebetween. A pixel array including data lines, gate lines, a TFT, a pixel electrode, and a storage capacitor is formed on the lower substrate SL of the display panel DP. The black matrix BM, the color filter, and the common electrode are formed on the upper substrate SU of the display panel DP. The liquid crystal cells are driven by an electric field between the pixel electrodes connected to the TFT and the common electrode. The upper polarizing film PU and the lower polarizing film PL are attached to the outside of each of the upper substrate SU and the lower substrate SL of the display panel DP.

5 illustrates a 3D display device having an in-cell black strip (BS) structure. In FIG. 5, the black strip BS is formed by using pixels smaller than the normal pixels. The pixels that function as the black strip BS function as pixels which display an image in the same manner as the normal pixel in the 2D mode. On the other hand, in the 3D mode, the black strip (BS) operates to combine the black strip (BS) and the black matrix (BM) has a structure to prevent cross talk between the left eye image and the right eye image.

The patterned retarder PR is attached to the outside of the upper polarizing film PU of the display panel DP. In the patterned retarder PR, unit retarders corresponding to each line having one line of pixels arranged in the horizontal direction of the display panel DP as a basic unit are arranged. For example, one unit retarder is allocated to correspond to an area of pixels commonly connected to one gate line. In particular, the first retarder RT1 is assigned to the odd lines of the patterned retarder PR, and the second retarder RT2 is assigned to the even lines of the patterned retarder PR. do. The first retarder RT1 delays the phase value of the light from the display panel DP by + λ / 4 (where λ is the wavelength of the light) to transmit the first circularly polarized light. The second retarder RT2 delays the phase value of the light from the display panel DP by -λ / 4 (actually by 3λ / 4) to transmit the second circularly polarized light. The light transmission axis of the first retarder RT1 and the light transmission axis of the second retarder RT2 are perpendicular to each other.

For example, the first retarder RT1 of the patterned retarder PR may be implemented to pass only left circularly polarized light. The second retarder RT2 may be implemented as a polarization filter to pass only right circularly polarized light. Therefore, the light of the image displayed on the radix line of the display panel DP is converted into the first circularly polarized light (that is, the left circularly polarized light) through the first retarder RT1, and the light is transmitted to the even line of the display panel DP. Light of the displayed image passes through the second retarder RT2 and is converted into second circularly polarized light (ie, right circularly polarized light).

The polarizing glasses PG include a left eyeglass window LG having a first polarizing filter P1 and a right eyeglass window RG having a second polarizing filter P2. The first polarization filter P1 has the same polarization characteristic as that of the first retarder RT1 of the pattern retarder PR. The second polarization filter P2 has the same polarization characteristic as that of the second retarder RT2 of the pattern retarder PR. For example, the first polarization filter P1 of the polarizing glasses PG may be selected as the left circle polarization filter, and the second polarization filter P2 of the polarizing glasses PG may be selected as the right polarization filter.

The prism PZ is disposed in the boundary region between the first retarder RT1 and the second retarder RT2. The prism PZ may have a trapezoidal shape having a symmetrical structure. An upper side having a predetermined distance from side to side at the boundary line portion between the first retarder RT1 and the second retarder RT2, the lower side corresponding to the summation distance of the black strip BS and the black matrix BM, and the upper side It has a trapezoidal shape with two hypotenuses connecting the two ends of the underside at each end of. At this time, the base angles of the two hypotenuses are defined as the inclination angle α of the prism PZ, and the height of the prism PZ is defined as d, which is the thickness of the prism PZ. Since the overall size of the prism PZ is formed over the area where the black strip BS and the black matrix BM are combined, the length of the zero is defined as the length W of the base of the prism PZ. Here, it is not necessary to specifically limit the length of the upper side of the prism PZ, but preferably twice the distance from the boundary between the first retarder RT1 and the second retarder RT2 to the black matrix BM. desirable.

In FIG. 5, the prism PZ is illustrated in a single trapezoidal shape only, but a prism sheet having various trapezoidal prisms PZ disposed between each first retarder RT1 and each second retarder RT2. It can be configured as. In FIG. 4, only the trapezoidal prism PZ is illustrated, but other similar shapes may be implemented, for example, in the form of a lenticular lens. In the present embodiment, a description will be given focusing on the trapezoidal shape which is the easiest to manufacture.

Hereinafter, the operating state of the wide viewing angle 3D image display device using the prism according to the present invention will be described in more detail with reference to FIGS. 6 and 7. FIG. 6 is a diagram illustrating a case where the wide viewing angle 3D image display device using the prism according to the present invention operates in the 2D mode. FIG. 7 is a view for explaining a case in which the wide viewing angle 3D image display device using the prism according to the present invention operates in the 3D mode.

First, a case of operating in the 2D mode will be described with reference to FIG. 6. In 2D mode, there is no need to separate the left eye image and the right eye image, so the black strip BS is not used. In the structure shown in FIG. 5, the black strip BS region serves as another pixel region. In particular, it operates in the same manner as the pixel in which the black strip BS is located, thereby providing a high luminance 2D image.

In addition, as shown in FIG. 6, light passing straight to the front direction and passing through the black strip BS region is focused in the front direction through the prism PZ located at the front side thereof. In particular, in this case, it passes through the hypotenuse and the upper side of the trapezoidal prism PZ. Light incident in the front direction toward the inclined surface of the prism PZ corresponding to the trapezoidal hypotenuse is refracted inward from the inclined surface and focused in the front direction (light path ⓐ). Therefore, in 2D mode, the front brightness is further improved, and a high quality screen can be obtained.

On the other hand, the black matrix BM serves to prevent mixing of light between neighboring pixels. When the viewing distance is close, light emitted from neighboring pixels may be introduced. In this case, the incident light enters the inclined plane of the prism PZ corresponding to the trapezoidal hypotenuse, and the incident light is further refracted to the outside (light path ⓑ). Therefore, the lens is refracted at a larger angle than the viewing angle and thus is not observed outside the viewing angle.

In addition, most of the lights normally traveling in the front direction outside the prism PZ region pass through the color filter corresponding to each pixel and travel in the front direction (optical path ⓒ). Therefore, the viewer is normally recognized in front of the viewer.

Next, a case of operating in the 3D mode will be described with reference to FIG. 7. In the 3D mode, a black strip BS is operated to prevent cross talk between the left eye image and the right eye image. In particular, the black strip BS functions to prevent cross talk with the black matrix BM. The left eye image (or the right eye image) is the second retarder RT2 (or the first retarder RT1) for the right eye image (or the left eye image) by the sum of the black strips BS and the black matrix BM. The critical angle θ incident at)) corresponds to the viewing angle of the 3D image.

In the case of light traveling straight in the front direction from the pixel emitting the left eye image or the right eye image, the light passes through the first retarder RT1 or the second retarder RT2 positioned in the corresponding pixel, respectively, and proceeds to the front. In this case, most of them go straight without passing through the prism PZ, and normally the left eye image is left circularly polarized and the right eye image is right circularly polarized (light path ⓧ).

On the other hand, the light incident outside the viewing angle at a larger angle has the following optical path. In FIG. 7, for convenience, the light incident at the viewing angle θ is described with reference to the critical optical path. Light incident on the first retarder RT1 from the pixel emitting the right eye image is polarized to the left. The light of this left circularly polarized right eye image causes cross talk. In addition, light incident on the second retarder RT2 from the pixel emitting the left eye image is circularly polarized. The light in the right polarized left eye image also causes cross talk. However, these lights are further refracted to the outside of the viewing angle by the inclined plane of the prism PZ corresponding to the trapezoidal hypotenuse (light path ⓨ). That is, if there is no prism PZ, the light of the left circularly polarized light (or right circularly polarized light) of the right eye image (or the left eye image) proceeds in the direction shown by the dotted line and is recognized by the observer's left eye so that the ghost image is generated. appear. However, in the present invention, the light causing the ghost image is refracted by the prism PZ and guided to the outside so that it is not recognized by the observer.

On the other hand, the light incident to the upper region of the prism PZ passes through the normal retarder region. The path of the normally polarized lights has an exit angle greater than the incident angle, but since the upper side of the prism PZ is horizontal, the path is refracted at a smaller angle than when incident on the inclined plane (optical path VII). Therefore, the prism PZ refracts the crosstalk (or ghost image) to the outside of the viewing angle, but refracts normal light toward the center.

Hereinafter, a method of determining the base angle of the preferred prism PZ for causing the cross-talk causing incident light into the prism PZ and normal lights to have different refractive angles will be described. Here, the display panel DP will be described in the case of the liquid crystal display device mainly used at present. 8 is a view showing the base angle of the prism preferred in the wide viewing angle 3D image display device having a prism according to the present invention.

In the case of the patterned retarder type liquid crystal display device which the display panel DP mainly uses, the distance from the black strip BS to the outer surface of the patterned retarder PR is about 700 to 1000 μm, and the black strip The combined width of the (BS) and the black matrix (BM) is about 150 to 200 μm. Therefore, the viewing angle of the patterned retarder type 3D display device which is mainly used has a value of about 6.9 degrees (about 7 degrees). In this case, as shown in FIG. 5, if the prism PZ according to the present invention is applied, the following results can be obtained.

Referring to FIG. 8, since light 100 causing cross talk is light incident at a value larger than the viewing angle θ (either up or down), light incident at this critical angle θ will be described. When the base angle of the prism PZ is α, the light 100 traveling with the viewing angle θ is incident on the inclined plane of the prism PZ at the incident angle β and refracted at the exit angle γ. Since the prism PZ mainly uses a transparent film, the refractive index n 'is about 1.5, and the refractive index n of air is 1. The light 100 causing cross talk then proceeds according to the next Snell's Law.

8, it can be seen that the following Equation 2 is satisfied.

In addition, if the base angle α of the prism PZ is larger than the viewing angle θ, since β has a negative value, total reflection may occur on the inclined surface of the prism PZ, and crosstalk may be more severe. Therefore, the base angle α of the prism PZ should have a value smaller than the viewing angle θ. That is, the relation of 0 degrees <α <viewing angle θ must be satisfied.

For example, in the case of the patterned retarder type liquid crystal display device mainly used at present, the base angle α of the prism PZ can be appropriately determined between 1 degree and 7 degrees.

When the base angle α of the prism PZ is changed from 1 degree to 6 degrees, the emission angle γ refracted on the inclined surface of the prism PZ is calculated using Equation 1 and Equation 2 as shown in Table 1 below.

Base angle α 1 degree 2 degrees 3 degree 4 degrees 5 degrees 6 degrees 7 degrees Exit angle γ 8.9 degrees 7.4 degrees 5.9 degrees 4.4 degrees 2.9 degrees 1.4 degrees -0.1 degree

As shown in Table 1, when the base angle α of the prism PZ is set to have an angle smaller than the viewing angle θ, light inducing crosstalk having a value larger than θ, which is a critical angle that proceeds to the inclined plane of the prism PZ, is obtained. Compared to the case where the prism PZ does not exist, the reference numeral 100 may be further refracted with an angle value between about 1.4 degrees and 9 degrees, so that the viewing angle may be increased. Referring to Table 1, it can be seen that it is preferable for the viewing angle to have an exit angle of at least 5 degrees or more. In addition, if the base angle α is 0 degrees, there is no meaning because there is no prism PZ. Therefore, it is most preferable that the base angle (alpha) of prism PZ has a value of 0 degree | time or more and 3 degrees or less.

As can be seen from Table 1, it can be seen that the exit angle γ has a negative value when the base angle α of the prism PZ is equal to or larger than the viewing angle. In other words, the crosstalk is better generated as it proceeds further into the viewing angle range.

As a result, the base angle of the prism PZ is set so that the display panel DP of the 3D display device to which the prism PZ is to be applied is used to cause the light causing the crosstalk incident to the prism PZ to be refracted to the outside of the viewing angle. It should be chosen to have a value smaller than the viewing angle. In particular, it is most desirable to have a value between greater than 0 degrees and less than or equal to 3 degrees.

In the above description, explanation has been made mainly on the refraction in the case of exiting from the prism. Although refraction occurs even when the light is incident on the prism, in the present invention, it is important to how the light exiting the prism is refracted. Therefore, the refraction of light incident on the prism has not been described for convenience.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

DP: Display panel SL: Lower glass substrate
SU: upper glass substrate PL: lower polarizing film
PU: upper polarizing film PG: polarizing glasses
P1: first polarizing filter P2: second polarizing filter
RG: Right eye view LG: Left eye view
PR: Patterned Retarder RT1: First Retarder
RT2: Second Retarder BM: Black Matrix
BS: Black Strip PZ: Prism
L1: (first row) left eye image R1: (first row) right eye image
100: light causing crosstalk

Claims (7)

Display panel;
A patterned retarder having a first retarder and a second retarder positioned on a front surface of the display panel; And
And a prism positioned at a front surface of the patterned retarder and positioned at a boundary area between the first retarder and the second retarder.
The method of claim 1,
In the display panel,
A black strip formed at a position corresponding to a boundary area between the first retarder and the second retarder; And
And a black matrix formed adjacent to the black strip.
The method of claim 2,
And an area where the black strip and the black matrix are combined is divided so as to be divided based on a boundary line between the first retarder and the second retarder.
The method of claim 3, wherein
The prism is disposed in an area in which the black strip and the black matrix are formed.
The method of claim 4, wherein the prism,
An underside having a size corresponding to a width of an area in which the black strip and the black matrix are formed;
An upper edge having a magnitude less than or equal to two times the distance between the black matrix and the boundary line; And
And a trapezoid comprising two hypotenuses connecting both end points of the bottom side and both end points of the upper side, respectively.
The method of claim 5, wherein
And the prism has a base angle smaller than a viewing angle defined by the display panel and the patterned retarder.
The method according to claim 6,
And the base angle of the prism is greater than 0 degrees and less than or equal to 3 degrees.

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