KR20090059415A - 3d image display device - Google Patents

Abstract

A 3D image display device is provided to improve optical efficiency by performing a 3D stereoscopic image having sense of depth through one display device. A 3D image display device(110) includes a display device(120), a polarizing plate(130), a first polarized light reflecting member(140), and a reflecting member(150). In the display device, a plurality of pixels is arranged into a matrix type. The polarizing plate is formed with formation in which a first polarizing pattern(130a) corresponds to a second polarizing pattern(130b). The first polarizing pattern covers a front side of the display device. The first polarizing pattern has a first polarizing axis corresponding to pixels of an odd column among a plurality of pixels. The second polarizing pattern has a second polarizing axis corresponding to pixels of an even column. The second polarizing axis is different from the first polarizing axis. The first polarizing light reflecting member is included on the polarizing plate. The reflecting member is parallel arranged with the first polarizing light reflecting member.

Description

3D image display device {3D image display device}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image display device, and more particularly, to a three-dimensional image display device in which a three-dimensional image with a sense of depth is represented by two images having different distances to a user.

Recently, as the users' demand for a display device capable of displaying 3D images more realistically with stereoscopicity has increased, a display device capable of 3D stereoscopic expression has been developed.

In general, a three-dimensional image representing a three-dimensional image is made by the principle of stereo vision through two eyes. The parallax of two eyes, that is, the binocular disparity that appears due to the presence of two eyes about 65 mm apart. A display device capable of displaying a three-dimensional image by using the device has been proposed.

In more detail, the three-dimensional implementation shows that the left and right eyes looking at the display device see two different two-dimensional images, and when these two images are transmitted through the retina to the brain, the brains fuse them together exactly and the original 3 The depth and reality of the dimensional image is reproduced. Such a phenomenon is commonly referred to as stereography.

Techniques proposed for displaying three-dimensional stereoscopic images in a device having a two-dimensional screen display include a stereoscopic image display by special glasses, an autostereoscopic stereoscopic display, and a holographic display method.

The three-dimensional image display method using the special glasses is the polarization glasses method using the vibration direction or the rotation direction of the polarization, the time-division glasses method alternately presenting while switching the left and right images and the method of delivering light of different brightness in the left and right. Phosphorus concentration difference can be divided.

In addition, the autostereoscopic 3D display method includes a parallax barrier method and a semi-cylindrical lens for separating and observing an image through a vertical grid-shaped aperture in front of each image corresponding to left and right eyes. The cylindrical lens may be divided into a lenticular method using a lenticular plate arranged in a stripe form and an integral photography method using a lens plate in the shape of a fly.

In addition, the holographic display method can obtain a three-dimensional stereoscopic image having all factors such as focus control, binocular disparity, and motion parallax, which are factors of generating a three-dimensional effect, and are classified into a laser light reproduction hologram and a white light reproduction hologram.

Recently, a method of implementing a 3D stereoscopic image through two display apparatuses implementing different images in addition to the 3D image implementation method described above has been proposed.

1 is a simplified conceptual diagram of a conventional three-dimensional image display device characterized in that to implement a three-dimensional stereoscopic image by the sense of depth using two display elements having a different distance to the viewer.

As shown in the drawing, the three-dimensional image display device 10 having a sense of depth includes a first display element 15 positioned at a first distance d1 from a viewer, and the first display element 15 is provided. The second display element 25 overlaps a second distance d2 smaller than the first distance d1 from the viewer on the front surface, and between the first and second display elements 15 and 25. There is provided an optical sheet 20 having a plurality of coating layers. In this case, the optical sheet 20 disposed between the first and second display devices 15 and 25 may remove the interference phenomenon when the first display device 15 is viewed through the second display device 25. It is for.

This configuration allows the viewer to view the image displayed from the first display element 15 through the second display element 25 and simultaneously view the image displayed from the second display element 25. These two images are superimposed so that the viewer can see the final image displayed with a three-dimensional depth.

However, in the conventional 3D image display apparatus 10 having the above-described configuration, since the image coming from the first display element 15 reaches the viewer's eye through the second display element 25, its light efficiency is increased. You can see that it is not very good.

For example, when both the first display element 15 and the second display element 25 are configured as a liquid crystal display device, the optical efficiency of the final image that the viewer actually sees is based on the light source of the first display element 15. 18% to 21%.

In more detail, in the state where the optical member 20 is excluded, the final light efficiency E of the first display device 15 is' light from the first display device 15 * second display device 25. ) Transmittance of the polarizing plate (not shown) * aperture ratio of the second display element 25 * transmittance of the color filter layer inside the second display element 25 ', where the transmittance of the polarizing plate is usually 90%, Since the typical aperture ratio is 60% to 70% and the transmittance of the color filter layer is usually 33%, it can be seen that the final light efficiency is about 18% to 21% of the light emitted from the first display element 15. .

Therefore, in this configuration, when a dark image is displayed on the first display element 15 and a bright image is displayed on the second display element 25, the viewer who actually sees the superimposed image actually displays the first display. The image of the element 15 becomes invisible, causing a problem that the three-dimensional image due to the distance cannot be viewed.

Accordingly, the present invention has been made to solve the above problems, and a first object of the present invention is to provide a three-dimensional stereoscopic image having an excellent sense of depth.

Another object of the present invention is to provide a three-dimensional (3D) image display device capable of preventing a problem of failing to implement a three-dimensional image with a depth overlapping with a second image when realizing a dark image of the first image.

According to an aspect of the present invention, there is provided a three-dimensional image display device comprising: a display device in which a plurality of pixels are arranged in a matrix; A first polarization pattern covering an entire surface of the display device and having a first polarization axis corresponding to odd-numbered pixels among the plurality of pixels, and a second polarization light having a second polarization axis different from the first polarization axis to correspond to even-numbered pixels A polarizing plate configured to correspond to a pattern; A first polarization reflecting member provided on the polarizing plate at a first angle with the surface thereof; And a reflection member disposed side by side with the first polarization reflection member and a first spacing interval, wherein the first polarization reflection member includes first polarized light or second polarization pattern passing through the first polarization pattern. It is characterized by selectively reflecting any one of the second polarized light passing through the other light and transmitting the other light.

The reflecting member is configured to be located farther from the polarizing plate than the first polarizing reflecting member.

The reflective member may have a characteristic of selectively reflecting polarized light transmitted through the first polarized light reflective member among the first polarized light and the second polarized light, wherein the second polarized light is It is preferable that the first polarized light and its polarization axis are perpendicular.

The first polarizing reflecting member and the reflecting member are made of one selected from a film having a cholesteric liquid crystal layer, a dual brightness enhancement film (DBEF) and a wire grid polarizer film, which are reflective polarizing sheets. It is preferable.

The reflection member is characterized in that the general mirror reflects all light.

The first angle is 45 degrees.

The 3D image display device includes a first image realizing light passing through the first polarization pattern and a first image having a second distance greater than the first distance behind the reflective member when the user looks at the polarization reflecting mirror. The first image and the second virtual image are formed by the second image realization light passing through the second polarization pattern to realize a three-dimensional image having a sense of depth, and the second separation interval signs the first separation interval at the first angle. It is characterized by being divided by (sin) value.

The display device may be a liquid crystal display device or an organic light emitting display device having a liquid crystal panel and a backlight unit.

The three-dimensional image display device according to the present invention, through a polarization reflecting mirror and a reflective member disposed at a predetermined interval to sense the depth through a single display element by the configuration to reach only a viewer to a specific polarized light selectively Since it is possible to implement a three-dimensional stereoscopic image with this has the effect of improving the light efficiency.

In addition, two display elements are used to provide a superimposed image at a distance through one display element, a polarization reflecting mirror, and a reflection member, instead of expressing an overlapped image. Since the second display device is not obscured, there is an advantage in that a three-dimensional stereoscopic image having a sense of depth can always be realized regardless of the light and dark of the display device.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

2 is a block diagram of a three-dimensional display device according to the present invention capable of representing a three-dimensional image with a sense of depth.

As shown in the drawing, the three-dimensional image display device 110 capable of implementing a sense of depth according to the present invention is characterized in that one display element 120 and its polarization axis are different from above the display element 120. Polarizing plate 130 having a first polarization pattern 130a and a second polarization pattern 130b, and first and second polarization reflections disposed to be inclined at a specific angle on the polarizing plate 130 and spaced apart from each other by a predetermined distance. It is comprised including the mirror 140,150.

In the three-dimensional image display device 110 having a sense of depth having such a configuration, the display device 120 is preferably a liquid crystal display device or an organic light emitting display device which is a flat panel display device characterized by a lightweight and thin.

The liquid crystal display device includes a liquid crystal panel, a polarizing film provided on an outer surface of the liquid crystal panel, and a backlight unit for supplying a light source to the liquid crystal panel. In this case, the liquid crystal panel includes a gate and data lines defining a plurality of subpixels and intersecting with each other, a thin film transistor connected to the two wires, and a pixel electrode connected to the thin film transistor and formed for each subpixel. An array substrate, a color filter substrate including a color filter layer in which red, green, and blue color filter patterns are sequentially repeated corresponding to each subpixel of the array substrate, and a common electrode, and a liquid crystal layer interposed between the two substrates do. In this case, the polarizing film may be provided only on one outer surface of the liquid crystal panel according to the characteristics of the liquid crystal display device, or may be omitted.

In addition, the organic light emitting diode is provided with an organic light emitting diode composed of a first electrode, an organic light emitting layer, and a second electrode for an array substrate including a gate, a data line, and a thin film transistor, and comprises an opposing substrate encapsulating the same.

Referring to FIG. 3, which is a view when the display device 120 having the above configuration is viewed from the front, the display device 120 includes red, green, and blue subpixels R, G, and S formed sequentially in the horizontal direction. B) constitutes one pixel region P, and the pixel regions P having such a configuration are arranged in a matrix form. At this time, the substantially image displayed through the display element 120 alternates with each other in the form of a vertical stripe with respect to each of the pixel areas P, and the first image information and the second image information are inputted so that an odd number of columns, namely, The first image 1 is displayed in the pixel regions P in the 3rd and 5th rows, and the second image 2 is displayed in the pixel regions P of the even columns, that is, the second, 4th, and 6th rows. It is characteristic. In this case, the displayed positions of the first image 1 and the second image 2 in the display element 120 may be interchanged with each other.

Meanwhile, referring to FIG. 4, which shows a plan view of FIGS. 2 and 2, the display device 120 simultaneously expressing the first and second images 1 and 2 in odd-numbered and even-numbered pixel regions P, respectively. ), A plurality of first polarization patterns 130a and second polarization patterns 130b having the same width w1 as the pixel area width w1 on the upper surface thereof, and having a vertical stripe type and having different polarization axes. The polarizing plate 130 which has a form which alternates) is provided.

The plurality of first polarization patterns 130a correspond to odd-numbered pixel regions P for displaying the first image 1 of the display device 120, and the plurality of second polarization patterns 130b are formed of It is characterized in that it is arranged so as to correspond to the even-numbered pixel region P displaying the two images 2. In this case, it is most preferable that the first polarization pattern 130a and the second polarization pattern 130b having different polarization axes are arranged such that their polarization axes are perpendicular to each other.

Next, an upper surface of the polarizing plate 130 having such a configuration forms a predetermined angle θ, preferably 45 degrees, with respect to the surface of the polarizing plate 130, and the first and second polarization reflecting members 140 and 150 are formed. It is composed. In this case, the first and second polarization reflecting members 140 and 150 are arranged in parallel with each other and spaced apart from each other by a predetermined interval. The first and second polarization reflecting members 140 and 150 may reflect light polarized in a specific direction and transmit other polarized light. In this case, the first polarized light reflecting member 140 configured to be adjacent to the polarizing plate 130 has the light emitted from the even-numbered pixel region P displaying the second image 2 of the display element 120 again. The first polarized light emitted by passing through the second polarization pattern 130b of 130 is reflected to be emitted toward the viewer, and light other than the first polarized light is transmitted. In addition, the second polarization reflecting member 150 arranged side by side with a first spacing d above the first polarization reflecting member 140 displays the first image 1 of the display element 120. The light emitted from the odd-numbered pixel region P is again reflected by the second polarized light emitted by passing through the first polarization pattern 130a of the polarizer 130 to be emitted toward the viewer, and the second polarized light. Light other than the made light transmits. In this case, the light displaying the first image 1 reaches the surface of the first polarized light reflecting mirror 140, but the polarization characteristics are different, and thus the light passing through the surface of the first polarized light reflecting mirror 140 is problematic. It doesn't work. In this case, the first and second polarized light reaching the viewer has a polarization state perpendicular to each other.

Meanwhile, the first and second polarization reflecting members 140 and 150 having the first spacing d from each other and having a specific angle θ, preferably 45 degrees, with respect to the surface of the polarizing plate 130 may include: A film having a cholesteric liquid crystal layer that selectively reflects light polarized in a specific wavelength band or in a specific direction, a dual polarization enhancement film (DBEF) and a wire grid polarizer film (reflective polarizing sheet) It is characterized by one.

When viewing an image through the 3D image display apparatus 110 having the above-described structure, a viewer can actually see the actual display element 120 and the first polarization reflecting member on the back of the second polarization reflecting member 150. A first display element having a second spacing D spaced apart by a specific multiple of the first spacing d between the first and second polarization reflecting members 140 and 150 at a distance spaced by the spacing between 140 And the virtual image are viewed as if the and second display elements are located. In this case, the viewer may view the images displayed through the first and second virtual images formed on the rear surface of the second polarization reflecting member 150 with these second spacing D and overlap the three-dimensional stereoscopic image with a sense of depth. You can watch. Since the first virtual image and the second virtual image viewed by the viewer are different from each other in the viewer, the viewer feels a real sense of depth.

At this time, by adjusting the first spacing (d) of the first and second polarization reflecting members 140 and 150 spaced apart from each other, a second spacing (D) between the plane formed by the first virtual image and the plane formed by the second virtual image (D) ) Can be adjusted thereby adjusting the sense of depth.

배 만큼이 되게 된다. The second spacing D between each plane formed by the first and second virtual images may be represented by d / sin (θ). In this case, most preferably, when the specific angle θ is 45 degrees, the second spacing D between the planes on which the first and second virtual images are formed is the first and second polarization reflecting members 140 and 150. Of the first spacing (d) between

That's twice as much.

On the other hand, the three-dimensional stereoscopic display device according to the present invention described above is provided with a cholesteric liquid crystal layer having a characteristic that both the first and second polarization reflecting members 140 and 150 selectively reflect light polarized in a specific direction. One film, a reflective polarizing sheet DBEF (dual brightness enhancement film), a wire grid polarizer film (wire grid polarizer film) is made of one selected from the one shown, but as a modified example is disposed adjacent to the polarizing plate 130 The first polarizing reflection member 140 is a film having a cholesteric liquid crystal layer for selectively reflecting specific polarized light, a dual brightness enhancement film (DBEF) as a reflective polarizing sheet, and a wire grid polarizer film. ), And instead of the second polarized light reflecting member 150 having a first spacing d on the rear thereof, irrespective of the polarization direction. It may constitute a general mirror that reflects all light.

 The first polarization reflecting member 140 passes through the second polarization pattern 130b of the polarizing plate 130 by the light from the even-numbered pixel region displaying the second image 2 of the display element 120 again. Since the first polarized light emitted is reflected to be emitted toward the viewer, most of the light already displaying the second image 2 does not reach the surface of the second polarized light reflective member 150. Therefore, the light reaching the surface of the second polarization reflecting member 150 becomes the light for displaying the first image 1 passing through the first polarization reflecting member 140 by changing the polarization direction. Since the light may be all reflected without the need to selectively reflect only the specific polarized light, a three-dimensional image having a sense of depth even if a general mirror is used instead of the second polarized reflective member 150 having the characteristic of selectively reflecting only the specific polarized light. There is no effect on the display quality. In this case, the first polarized light reflecting mirror 140 may be formed by an error in manufacturing the polarization patterns 130a and 130b having the polarization axis in a specific direction in the polarizing plate 130 and the polarized light reflecting ability of the first polarized light reflecting member 140. Although a small amount of light representing the second image 2 to pass through may occur, the display quality may substantially be affected. However, the degree of influence is very slight, and the polarization reflecting mirror is very expensive in terms of cost. On the other hand, it would be advantageous to use a common mirror in terms of manufacturing cost.

In the 3D projection display device 110 according to the present invention having such a structure, referring to FIG. 5, when a real object is viewed, a motion parallax effect in which an image is different depending on a viewer's vision is shown. This has the advantage of having a more three-dimensional effect. In the figure, the first image displays a background screen having a reference line in the center thereof, and the second image is substantially centered on the person as shown when the viewer moves to the left or right side when the person comes out in the center portion. As a result, it can be seen that the image of which the position of the baseline of the background is changed.

In the case of the 3D image display device according to the present invention, two display elements are formed by implementing a first and a second image spaced apart from each other with substantially different image information by using one display element. It can be seen that the light efficiency is improved compared to the conventional three-dimensional image display device having a configuration to pass through one display element by using.

     The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

1 is a simplified conceptual diagram of a conventional three-dimensional image display device, characterized in that to implement a three-dimensional stereoscopic image by the sense of depth using two display elements varying the distance to the viewer.

2 is a block diagram of a three-dimensional display device according to the present invention capable of representing a three-dimensional image with a sense of depth.

3 is a front view of a display device used in a 3D stereoscopic image display device according to the present invention;

4 is a front view of the polarizing plate used in the three-dimensional stereoscopic image display according to the present invention.

FIG. 5 is a diagram illustrating a motion parallax effect in a three-dimensional stereoscopic image display device according to the present invention. FIG.

<Description of the symbols for the main parts of the drawings>

110: 3D image display device 120: display element

130: polarizers 130a, 130b: first and second polarization patterns

140: first polarization reflecting member 150: reflecting member

d: first spacing D: second spacing

w1: pixel area width θ: first angle

Claims (9)

A display device in which a plurality of pixels are arranged in a matrix; A first polarization pattern covering an entire surface of the display device and having a first polarization axis corresponding to odd-numbered pixels among the plurality of pixels, and a second polarization light having a second polarization axis different from the first polarization axis to correspond to even-numbered pixels A polarizing plate configured to correspond to a pattern; A first polarization reflecting member provided on the polarizing plate at a first angle with the surface thereof; Reflecting members arranged in parallel with the first polarization reflecting member and a first spacing  Wherein the first polarization reflective member selectively reflects any one of the first polarized light passing through the first polarization pattern or the second polarized light passing through the second polarization pattern. Three-dimensional image display device characterized in that the transmission of the outside light. The method of claim 1, And the reflecting member is arranged farther from the polarizing plate than the first polarizing reflecting member. The method of claim 1, The reflective member may have a characteristic of selectively reflecting polarized light transmitted through the first polarized light reflective member among the first polarized light and the second polarized light. The method of claim 1, And wherein the second polarized light is perpendicular to the first polarized light and its polarization axis. The method of claim 1, The first polarizing reflecting member and the reflecting member are made of one selected from a film having a cholesteric liquid crystal layer, a dual brightness enhancement film (DBEF) and a wire grid polarizer film, which are reflective polarizing sheets. Three-dimensional image display device characterized in that. The method of claim 1, The reflection member is a three-dimensional image display device, characterized in that the general mirror for reflecting all light. The method of claim 1, And the first angle is 45 degrees. The method according to claim 1 or 7, The 3D image display device includes a first image realizing light passing through the first polarization pattern and a first image having a second distance greater than the first distance behind the reflective member when the user looks at the polarization reflecting mirror. The first image and the second virtual image are formed by the second image realizing light passing through the second polarization pattern to realize a three-dimensional image with depth, and the second separation interval is defined by the first separation interval of the first angle. 3D image display device characterized in that the value divided by the sign (sin). The method of claim 1, The display device is a liquid crystal display device or an organic light emitting display device having a liquid crystal panel and a backlight unit.

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