KR20120132190A - Image Diplay Device and Stereoscopic Display System Using the Same - Google Patents

Abstract

PURPOSE: An image display device and a stereoscopic display system using the same are provided to display a three-dimensional image without generating a residual retardation value. CONSTITUTION: An image display device(100) includes an image panel(110), a first polarizing plate(115), a polarization switching cell(120) and a first quarter wave plate(150). The first polarization plate has a first transmission axis on the image panel. Polarized light switching cell includes ferroelectric liquid crystal on the first polarizing plate and function as a half-wave plate in different direction according to a first voltage. The first quarter wave plate is formed on the polarized light switching cell.

Description

Image Diplay Device and Stereoscopic Display System Using the Same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly, to an active retarder cell capable of switching polarization including a ferroelectric liquid crystal, thereby enabling a stereoscopic display without causing a residual retardation value and a stereoscopic image display thereof. It is about the system.

The services to be realized for the high speed of information to be built on the high-speed information communication network today are 'seeing and listening' multi-media centering on digital terminals that process text, voice, and video at high speed from simply 'listening and talking' service like the current telephone. It is expected to develop into a media type service and ultimately become a hyper-space realistic 3D stereoscopic information communication service that transcends time and space.

In general, the three-dimensional image representing the three-dimensional image is made by the principle of stereo vision through two eyes, because the parallax of two eyes, that is, the two eyes are about 65mm apart, the left and right side due to the difference between the positions of the two eyes The eyes see slightly different images. As such, the difference in the image due to the positional difference between the two eyes is called binocular disparity. The 3D stereoscopic display device uses the binocular parallax to allow the left eye to see only the image of the left eye and the right eye to see only the right eye image.

In other words, the left and right eyes see different two-dimensional images, and when these two images are delivered to the brain through the retina, the brain accurately fuses them to reproduce the depth and reality of the original three-dimensional image. Such a capability is commonly referred to as stereography, and a device in which it is applied as a display device is called a stereoscopic display device.

On the other hand, such a stereoscopic display device is largely divided into a glasses method and a glasses-free method.

For example, a spectacle-type stereoscopic display device designs a film-type retarder on the upper side of the image panel, and distinguishes the output of the left-eye image and the right-eye image by a portion having no retarder. The left lens blocks the left eye image when the right eye image passes through the right lens through the special glasses having polarization function, and the right lens blocks the right eye image when the left eye image passes through the left lens. In this case, each pattern of the retarder is designed in the shape of a stick-shaped strip in one direction, spaced apart from each other at equal intervals.

However, in the 3D mode, the thickness and spacing of each pattern of the retarder is very small, about 0.1 ~ 0.5mm, so our eyes do not recognize the spacing and the left and right eye images are displayed on one screen. However, in 2D mode excluding glasses, the amount of information that enters the eye in the same size screen is divided into half of the pattern of the film-type retarder, so that the resolution and the brightness are reduced to about half.

The conventional glasses-type stereoscopic display device has the following problems.

In the conventional film retarder, a film retarder is positioned on the image panel to distinguish the output of the left eye image and the right eye image. In this case, the output area of each image is fixed, and the viewer in 3D mode If there is a change in position, it may not be possible to view stereoscopic images.

In addition, in the 2D mode, since the film retarder is present on the image panel, the resolution reduction due to this cannot be avoided. In some cases, the viewer may recognize the film retarder, and efforts have been made to exclude the fixed pattern film retarder.

The present invention has been made to solve the above problems, and by implementing an active retarder cell that can switch the polarization including the ferroelectric liquid crystal, the image display device capable of stereoscopic display without causing a residual retardation value and its It is an object of the present invention to provide a stereoscopic image display system.

According to an aspect of the present invention, a video display device includes: an image panel; a first polarizing plate having a first transmission axis on the image panel; and a threshold voltage including a ferroelectric liquid crystal on the first polarizing plate. A polarization switching cell functioning as a half wave plate (HWP) in different directions according to the application of a first contrast voltage or a negative voltage; And a first quarter wave plate (QWP) on the polarization switching cell.

In the polarization switching cell, a slow axis of the ferroelectric liquid crystal is + 22.5 °, and the other is -22.5 °, when one of a positive first voltage and a negative first voltage is applied to the threshold voltage. .

The polarization switching cell linearly polarizes light passing through the first transmission axis by 45 ° in different directions when a positive first voltage and a negative first voltage are applied to the threshold voltage.

The application of the first positive voltage and the first negative voltage to the threshold voltage are divided into an even frame and an odd frame of the image panel.

The polarization switching cell emits light emitted through the first transmission axis as it is when no voltage is applied.

The transmission axis of the first quarter wave plate intersects the first transmission axis.

And further comprising glasses comprising a left eye lens and a right eye lens each having a second quadrant plate having the same transmission axis as the first quarter wave plate and a polarizing plate that transmits linearly polarized light 90 ° cross each other through the second quarter wave plate. It may include.

Each polarizing plate of the left eye lens and the right eye lens of the spectacles is closest to both eyes of the viewer.

The second quadrant plate linearly polarizes + 45 ° or -45 ° light that is circularly polarized into the first quarter wave plate and transmits the linearly polarized light to the polarizer.

The linearly polarized light transmission of + 45 ° or -45 ° of the second quarter wave plate is divided by an even frame and an odd frame of the image panel.

The polarization switching cell may include: a first substrate and a second substrate facing each other; a first electrode having a bar shape spaced apart from each other in one direction on the first substrate; and a second formed on the second substrate. electrode; And the ferroelectric liquid crystal formed between the first and second substrates.

And a voltage source for grounding the second electrode and applying a first positive voltage to the threshold voltage or a first negative voltage to the threshold voltage.

The image panel is any one of a liquid crystal panel, an organic light emitting display panel, a plasma display panel, a field emission display panel, and a quantum dot display panel.

The first polarizer may be included in the image panel.

In addition, the stereoscopic image display system of the present invention for achieving the above object is a threshold voltage including a video panel, a first polarizing plate having a first transmission axis on the image panel, and a ferroelectric liquid crystal on the first polarizing plate A polarization switching cell functioning as a half wave plate (HWP) in different directions according to the application of a first positive or negative contrast voltage and a first quarter wave plate (QWP) on the polarization switching cell. Display unit including; And a left eye lens and a right eye lens each having a second quadrant plate having the same transmission axis as the first quarter wave plate and a polarizing plate for transmitting linearly polarized light 90 ° crossed through the second quarter wave plate, respectively. It is characterized by including.

The image display device and its stereoscopic image display system of the present invention as described above include a polarization switching cell capable of linearly polarizing 45 ° in different directions depending on the voltage applied value, so that the voltage can be operated in a 2D mode without degrading resolution. In the 3D mode, the left and right eye images may be viewed according to the transmission axis of the polarizer included in the glasses, and the three-dimensional images may be visualized by fusion in the brains of the two images.

In particular, the ferroelectric liquid crystal is used and its long axis has a fast driving characteristic within a range of ± 22.5 ° so that the subframe of the image panel can be synchronized without delay. Therefore, it is possible to watch smooth stereoscopic images without delay.

In addition, since the compensation film required for the glasses may be omitted when the polarization switching cell driven by the switching method is provided, the components of the glasses may be simplified and the stereoscopic display may be performed at low cost.

1 is a cross-sectional view showing a three-dimensional image display system of the present invention
2A and 2B are diagrams showing optical paths in respective layers above an image panel in an even frame and an odd frame of the image display device of the present invention.
Figure 3 is a view showing the optical path of each optical film forming the glasses applied to the three-dimensional image display system of the present invention
4 is a view showing the light path of FIG.
5 is a diagram illustrating a stereoscopic image display system that performs stereoscopic display by applying voltage to an active retarder.
6A and 6B are plan views illustrating first and second substrates of a polarization switching cell of an image display device of the present invention.
7 is a cross-sectional view of FIGS. 6A and 6B.
8 is a simulation diagram showing white omnidirectional viewing angle luminance of a stereoscopic image display system of the present invention.
9 is a simulation diagram showing the black omni-directional viewing angle luminance of the stereoscopic image display system value of the present invention.
10 is a graph showing contrast ratios in vertical, horizontal, left and right viewing angles in the three-dimensional image display system of the present invention.

Hereinafter, a video display device of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a video display device of the present invention.

As shown in FIG. 1, the image display device 100 of the present invention includes an image panel 110, a first polarizing plate 115 having a first transmission axis on the image panel 110, and the first polarizing plate 115. The polarization switching cell which functions as a half wave plate (HWP) in different directions according to the application of the first or negative first voltage (Vth + V1, Vth-V1) to the threshold voltage including the ferroelectric liquid crystal on the image. And a first quarter wave plate (QWP) 150 on the polarization switching cell 120.

The stereoscopic image display system of the present invention, which applies the above-described image display apparatus 100 as a display unit, further includes glasses 140 facing the image display apparatus 100 described above.

The glasses 140 have a left eye lens and a right eye lens each having a polarizing plate that transmits linearly polarized light intersected with each other by 90 °.

Accordingly, the viewer recognizes the left eye image and the right eye image through the left eye lens and the right eye lens in different sub-frames (even frame and odd frame) through the glasses, and synthesizes them in the brain to feel a three-dimensional effect.

The image panel 110 may be any one of a liquid crystal panel, an organic light emitting display panel, a plasma display panel, a field emission display panel, and a quantum dot display panel. Although the illustrated example is limited to the liquid crystal panel, any flat panel panel can be applied regardless of its type.

In the drawing, the image panel 110 is a case where the liquid crystal panel is illustrated. The lower substrate 111 and the upper substrate 112 opposed to each other, the liquid crystal layer 113 formed between the upper and lower substrates, The second polarizer 114 is attached below the lower substrate 111. Here, the first polarizer 115 is attached to the upper substrate 112, as shown, may be formed to include during the manufacturing process of the image panel 110, in some cases, polarization switching It may be formed by attaching to the lower side of the cell 120.

If the image panel 110 is a display panel that does not require a polarizer other than the liquid crystal panel, the image panel 110 is attached to the lower side of the polarization switching cell 120.

Meanwhile, FIG. 1 includes a light source 130 under the image panel 110. The light source 130 may be selected and used according to the type of the image panel 110, and may be excluded.

In addition, the polarization switching cell 120 is schematically illustrated in FIG. 1 including the first and second substrates 121 and 122 and the ferroelectric liquid crystal layer 123. A detailed configuration thereof will be described later, and an electrode is included on at least the first and second substrates 121 and 122.

Referring to the drawings, the optical axis and the optical path of each layer of the stereoscopic image display system of the present invention will be described.

2A and 2B are diagrams showing optical paths at respective layers above an image panel in an even frame and an odd frame of the image display device of the present invention, and FIG. 3 shows glasses used in the stereoscopic image display system of the present invention. It is a figure which shows the optical path of each optical film. FIG. 4 is a view showing a light path of FIG. 3 in a poang curry sphere.

2A and 2B, the polarization switching cell 120 functions as a kind of half-wave plate in the 3D mode, and functions as a half-wave plate that emits linearly polarized light by changing directions according to the level of the voltage value.

In particular, the level of the voltage value is applied by applying a negative voltage (Vth-V1) to a threshold voltage in an odd frame and a positive voltage (Vth + V1) compared to a threshold voltage in an even frame, thereby reducing the long axis of the internal ferroelectric liquid crystal layer. axis, ne) to have ± 22.5 °. As a result, the light emitted through the first transmission axis through the first polarizing plate 115 is linearly polarized again by ± 45 ° to be emitted.

Here, the applied voltages of the odd frame and the even frame may be interchanged.

On the other hand, when no voltage is applied to the polarization switching cell 120, it functions as a transparent cell, and light passing through the first transmission axis through the first polarizing plate 115 at the bottom is transmitted as it is. For example, in the 2D mode, the polarization switching cell 120 is placed in a voltage-free state so that the light emitted from the lower portion through the first polarizing plate 115 can be displayed as it is. In this case, since the polarization switching cell 120 functions as a transparent cell without a specific pattern, the polarization switching cell 120 can watch a 2D image without degrading the resolution.

Alternatively, when the difference voltage of the threshold voltage Vth is applied between the electrodes provided on the first and second substrates 121 and 122 of the polarization switching cell 120, the ferroelectric liquid crystal is formed on the first substrate (FIG. 121 of 1) and the second substrate (see 122 of FIG. 1) may be arranged perpendicularly, and in this case, the first transmission axis may be transmitted as it is.

On the other hand, the application of the first positive voltage and the negative first voltage (Vth + V1, Vth-V1) relative to the threshold voltage is divided into an even frame and an odd frame of the image panel. That is, the polarization switching cell 120 is driven in synchronization with the subframe of the image panel.

Here, the transmission axis of the first quarter wave plate 150 crosses the first transmission axis.

In the configuration of the image display device 110, the components from the first polarizing plate 115 to the first quarter wave plate 150 are fixed on the image display device 110, and the polarization switching cell 120 is fixed. ) Can only change the light path output by time division depending on the level of the voltage value.

In this case, as shown in FIG. 2A, light linearly polarized by −45 ° through the first quarter wave plate 150 is unidirectionally polarized while passing through the first quarter wave plate 150. As shown in FIG. 2B, the first yarn The + 45 ° linearly polarized light through the wavelength plate 150 passes through the first quarter wave plate 150 and is left-polarized.

Referring to FIG. 3, when the image display device of the present invention is used as a display unit, an image visually recognized by each lens of the glasses is as follows.

First, each of the left eye lens and the right eye lens is + 45 ° or -45 ° through the second quarter wave plates 141 and 142 and the second quarter wave plate having the same transmission axis as the first quarter wave plate 150. Polarizing plates 142 and 144 having a transmission axis of + 45 ° or -45 ° to transmit linearly polarized light.

Here, each polarizing plate 142, 144 in each lens is an optical layer closest to the viewer's eye.

The optical path change of the image display device of the present invention will be described with reference to the Poang Cure sphere of FIG. 4.

As shown in FIG. 4, in an even frame, light transmitted in the direction of the first transmission axis through the first polarizing plate 115 passes through the polarization switching cell, and the azimuth angle of −45 ° is changed from ① ′ to ④ ′. Then, passing through the first quarter wave plate 150 again in the polarization switching cell, the extreme value of -90 ° changes from ④ 'to ⑤'. In this case, azimuth change means linearly polarized light and pole value change means circularly polarized light.

Similarly, in the odd frame, the light transmitted through the first polarizing plate 115 in the direction of the first transmission axis passes through the polarization switching cell 120 and the azimuth angle of + 45 ° is changed from ① 'to ②'. In addition, the polarization switching cell 120 passes through the first quarter wave plate 150, and the extreme value of + 90 ° changes from ② 'to ③'.

In each even frame, a positive first voltage Vth + V1 is applied to the polarization switching cell 120 so that the ferroelectric liquid crystal layer has a long axis of -22.5 °, and in the odd frame, the polarization switching cell. The ferroelectric liquid crystal layer has a long axis of + 22.5 ° by applying a positive first voltage Vth-V1 to the threshold voltage at 120.

Depending on the initial alignment conditions of the ferroelectric liquid crystal layer, the voltage conditions applied to the even frame and the odd frame may be different, or the voltage is applied to the same condition, and the slow axis of ± 22.5 ° may be reversed. The polarization switching cell 120 may be implemented.

On the other hand, the above-described polarization switching cell is a kind of active retarder in that it emits light in a specific direction and converts it according to voltage application.

5 is a diagram illustrating a stereoscopic image display system that performs stereoscopic display by applying voltage to an active retarder.

As illustrated in FIG. 5, a first polarizing plate, an active retarder 20, and a first quarter wave plate 30 having a first transmission axis are formed on an image panel (not shown).

In addition, each lens of the eyeglasses 50 facing the image panel has a second quarter wave plate 51, 54, a half wave plate 52 or a compensation film 55, and a second polarizing plate from far away from both eyes of the viewer. 53, 56).

In this case, the half wave plate 52 has a function of delaying the light exiting from the second quarter wave plate 51 by 90 degrees and emitting it. In addition, the compensation film 55 normally comes out in the direction of the first transmission axis without delay, and when the voltage is applied to the active retarder 20, the liquid crystal does not react on the surface of the active retarder internal alignment so that the residual retardation does not occur. It is to compensate for the generated point, and serves to twist the retardation light to the first transmission axis.

Here, the first quarter wave plate 30 has an optical axis of + 45 ° relative to the first transmission axis, and the second quarter wave plates 51 and 54 have an optical axis of -45 ° crossing 90 degrees therewith. .

The half-wave plate 52 and the compensation film 55 of the glasses have the same transmission axis as the first quarter wave plate 30, and the second polarizing plates 53 and 56 intersect the first transmission axis by 90 degrees. It has a transmission axis.

Here, the active retarder 20 drives the even frame and the odd frame according to whether voltage is applied (on or off), and a voltage application form different from the polarization switching cell of the stereoscopic image display system of the present invention described above. And the structure of the liquid crystal layer are shown.

In this case, the active retarder 20 emits light transmitted to the first transmission axis through the first polarizing plate 11 as it is, and when the voltage is off, the first polarizing plate 11. It has an optical axis intersected with the 1st transmission axis of (), and the light emission is interrupted | blocked.

In the case of using the active retarder of FIG. 5, when the voltage is applied, the light of the first transmission axis is emitted as it is through the active retarder 20, and after passing through the first quarter wave plate 30, left circularly polarized light. In addition, the second quadrant 54 of the glasses emits linearly polarized light in a vertical or horizontal direction, and the compensation film 55 emits light that has escaped the first transmission axis along the first transmission axis. It has a function to compensate as much as possible.

The stereoscopic image display system as shown in FIG. 5 has a different liquid crystal layer configuration, voltage application, and driving method in the active retarder compared to the stereoscopic image display system of the present invention described with reference to FIGS. 1 to 4, and an optical film included in the spectacle lens. Since at least three layers of the respective lenses are at least, polarization switching is possible, but there is a problem in that the structure is complicated.

 In the polarization switching cell of the present invention, in particular, the change in the major axis of the internal ferroelectric liquid crystal layer is ± 45 ° according to the state of the voltage application level, in particular, the application of the first positive voltage value Vth-V1 or Vth + 1 compared to the threshold voltage. It is significant that the compensation film required by improving the driving speed of the polarization switching cell and exhibiting different retardation characteristics depending on when the voltage is applied or not is applied.

EMBODIMENT OF THE INVENTION Hereinafter, the specific structure of the polarization switching cell of this invention is demonstrated with reference to drawings.

6A and 6B are plan views illustrating first and second substrates of a polarization switching cell of an image display device of the present invention, and FIG. 7 is a cross-sectional view of FIGS. 6A and 6B.

First, as illustrated in FIGS. 6A to 7, the polarization switching cell 120 has a first direction 121 and a second substrate 122 facing each other, and one direction on the first substrate 121. The first electrode 128 having a bar shape and the second electrode 129 formed on the second substrate 122 and the first and second substrates 121 and 122 spaced apart from each other by the same shape. The ferroelectric liquid crystal layer 123 including the ferroelectric liquid crystal.

The alignment layers 124a and 124b are further formed on the surface of the first substrate 121 including the first electrode 128 and on the second electrode 129, respectively.

The second electrode 129 is grounded, and a first positive voltage Vth + V1 is applied to the first electrode 121, or a negative first voltage Vth− is applied to the first electrode 121. A voltage source for applying V1) is further included.

Meanwhile, the first electrode 128 and the second electrode 129 are each made of a transparent conductive material, and may be made of ITO, IZO, ITZO, or the like.

The first electrode 128 is patterned along a line of pixels corresponding to the display area (dotted line) 125 of the image panel.

Here, the second electrode 129 is a through-electrode without any pattern therein, the whole is integrally connected, the figure is shown only the display area 125, it may be formed entirely in some cases.

Reference numerals 126 and 127, which are not described, indicate signal integrated circuits for connecting signals, and signal wirings for connecting between the driver integrated circuits and the first electrode 128, respectively, and the signal wirings 127 are formed of copper or molybdenum. The same wiring resistance is made of a small conductive material.

Meanwhile, the optical characteristics of the stereoscopic image display system using the polarization switching cell described above will be described.

FIG. 8 is a simulation diagram showing the white omnidirectional viewing angle luminance of the stereoscopic image display system of the present invention, FIG. 9 is a simulation diagram showing the black omnidirectional viewing angle luminance of the stereoscopic image display system value of the present invention, and FIG. 10 is a stereoscopic image of the present invention. In the display system, it is a graph which shows the contrast ratio in the up, down, left and right viewing angles.

As shown in Figs. 8 to 10, the contrast ratio is 1000: 1 or more in the center, and 10: 1 or more, which is a level at which viewers can see the image, in the range of ± 40 ° of the vertical viewing angle, and the left and right viewing angles are -50 ° to +35. It is possible at °.

Here, CR_H of FIG. 10 denotes a contrast ratio in the horizontal direction, and CR_V denotes a contrast ratio in the vertical direction.

In addition, the stereoscopic image display device of the present invention has a symmetrical left eye right-eye crosstalk characteristic in comparison with the active retarder of FIG. 5 driven by whether or not voltage is applied to the polarization switching cell according to a positive voltage application characteristic compared to a threshold voltage. In view of the characteristics of the ferroelectric liquid crystal, fast driving characteristics can be obtained.

Meanwhile, in the above-described stereoscopic image display system, the glasses can be selectively worn in the 3D mode. In the 2D mode, the glasses are not applied to the polarization switching cell, so that the glasses function as transparent cells to display the 2D image transmitted by the image panel 110. You can watch as it is without degrading the resolution.

In addition, in the 3D mode, the image is emitted having a transmission axis intersecting each other with the left eye and the right eye for each of the even frame and the odd frame, and the viewer finally synthesizes the 3D image.

On the other hand, the present invention described above is not limited to the above-described embodiment and the accompanying drawings, it is possible that various substitutions, modifications and changes within the scope without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in Esau.

100: video display device 110: video panel
120: polarization switching cell 130: light source
140: glasses 141, 143: second quarter wave plate
142 and 144: polarizing plate 150: first quarter wave plate

Claims (15)

Imaging panel;
A first polarizer having a first transmission axis on the image panel;
A polarization switching cell on the first polarizing plate, including a ferroelectric liquid crystal and functioning as a half wave plate (HWP) in different directions according to application of a positive or negative first voltage to a threshold voltage; And
And a first quarter wave plate (QWP) on the polarization switching cell. The method of claim 1,
The polarization switching cell has a long axis of the ferroelectric liquid crystal, wherein either one of the positive first voltage applied to the threshold voltage and the negative first voltage applied is + 22.5 °, and the other is -22.5 °. And a video display device. The method of claim 2,
And wherein the polarization switching cell linearly polarizes light passing through the first transmission axis by 45 ° in a different direction when a positive first voltage and a negative first voltage are applied to the threshold voltage. The method of claim 1,
The application of the first positive voltage and the first negative voltage relative to the threshold voltage are divided into an even frame and an odd frame of the image panel. The method of claim 1,
And the polarization switching cell emits light emitted through the first transmission axis as it is when no voltage is applied. The method of claim 1,
And a transmission axis of the first quarter wave plate intersects the first transmission axis. The method of claim 1,
And further comprising glasses comprising a left eye lens and a right eye lens each having a second quadrant plate having the same transmission axis as the first quarter wave plate and a polarizing plate that transmits linearly polarized light 90 ° cross each other through the second quarter wave plate. Video display device comprising a. 8. The method of claim 7,
And each polarizing plate of the left eye lens and the right eye lens of the glasses is closest to both eyes of the viewer. 8. The method of claim 7,
And the second quadrant plate linearly polarizes + 45 ° or -45 ° light that is circularly polarized into the first quarter wave plate and transmits the linearly polarized light to the polarizer. 8. The method of claim 7,
The linearly polarized light transmission of + 45 ° or -45 ° of the second quarter wave plate is divided by an even frame and an odd frame. The method of claim 1,
The polarization switching cell is
A first substrate and a second substrate facing each other;
A first electrode having a bar shape spaced apart from each other in one direction on the first substrate;
A second electrode formed on the second substrate; And
And the ferroelectric liquid crystal formed between the first and second substrates. 12. The method of claim 11,
And a voltage source for grounding the second electrode and applying a positive or negative first voltage to the first electrode. The method of claim 1,
And the image panel is one of a liquid crystal panel, an organic light emitting display panel, a plasma display panel, a field emission display panel, and a quantum dot display panel. The method of claim 13,
And the first polarizing plate is included in the image panel. An image panel, a first polarizing plate having a first transmission axis on the image panel, and a ferroelectric liquid crystal on the first polarizing plate including half wavelengths in different directions depending on application of a positive or negative first voltage to a threshold voltage. A display unit including a polarization switching cell functioning as a half wave plate (HWP) and a first quarter wave plate (QWP) on the polarization switching cell; And
And a pair of glasses including a left eye lens and a right eye lens each having a second quadrant plate having the same transmission axis as the first quarter wave plate and a polarizing plate that transmits linearly polarized light 90 ° cross each other through the second quarter wave plate. Stereoscopic display system characterized in that.

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