KR100662429B1 - Apparatus for holography display - Google Patents

Abstract

A 3D(three-dimensional) image display device is provided to doubly increase the horizontal and vertical resolution in a 3D mode by using a 3D filter inclined at a specific angle. A 3D image display device includes a 3D image panel(100) sampling R(Red), G(Green), and B(Blue) sub-pixels of each parallax image on the basis of at least two parallax images obtained to form a 3D image, multiplexing the sampled sub-pixels in a predetermined pattern, and vertically and horizontally repeating the predetermined pattern and a slit-type aperture array sheet forming the 3D image by diagonally crossing transparent and opaque regions(130,140) and separating parallax images for the left and right eyes of a viewer, and keeping a diagonal line at a predetermined angle. An angle(Ф) between a horizontal line and a slit-type diagonal line of the aperture array sheet satisfies the following formula, Ф=arctan(4Hp/3Vp), where Hp is a horizontal sub pixel period, and Vp is a vertical sub pixel period.

Description

Stereoscopic Display Device {Apparatus for holography display}

1 is a process of obtaining n direction-specific parallax images (PV) using n cameras in a stereoscopic system of glasses-free method.

2 is a configuration diagram of a three-dimensional method using a lenticular lens sheet having a conventional vertical axis

3A is a characteristic diagram of a direction-specific parallax image obtained from a direction-specific parallax image camera.

3B is a characteristic diagram of a stereoscopic image synthesized from a parallax image for each direction

Figure 4 is a three-dimensional scheme using a conventional lenticular plate

FIG. 5 is a positional view of a green pixel of a parallax image for each second direction in a stereoscopic method using a conventional lenticular plate in a vertical direction; FIG.

6 is a three-dimensional diagram using a tilted lenticular plate using nine conventional parallax images for each direction

7 is a position diagram of a green pixel of a stereoscopic image viewed through a lenticular plate in a stereoscopic method using a conventional inclined lenticular plate.

8 is a three-dimensional method using a conventional rectangular transmission area array plate (3D filter)

9 is a position view of a green pixel of a stereoscopic image viewed through a transmissive region array plate in a stereoscopic method using a conventional rectangular transmissive region array plate.

10 is a characteristic diagram of a stereoscopic image panel in the stereoscopic image display apparatus according to the present invention;

11 is a diagram illustrating a first embodiment of a stereoscopic image panel according to the present invention.

12 illustrates a second embodiment of a stereoscopic image panel according to the present invention.

13 is an image characteristic view shown to the left by the stereoscopic image display device according to the present invention;

14 is an image characteristic view of the right eye by the stereoscopic image display device according to the present invention;

FIG. 15 illustrates positions of green pixels of a stereoscopic image seen by an observer in a 3D mode according to the present invention.

16 is a block diagram of a stereoscopic image display device according to the present invention

17 is a block diagram of a 2D / 3D switchable filter according to the present invention

18A is a characteristic diagram of a 2D mode in a 2D / 3D switchable filter according to the present invention.

18b is a characteristic diagram of the 3D mode in the 2D / 3D switchable filter according to the present invention

19 is a configuration diagram of an outside method of the stereoscopic image display device according to the present invention.

* Explanation of symbols for main parts of drawings *

10: flat panel display element 20: lenticular lens plate

30 lenticular lens axis 40 tilted lenticular lens plate

50: rectangular transmission area arrangement 60: rectangular transparent area

70: opaque area of the rectangle

100: First Embodiment of Stereoscopic Display Panel According to the Present Invention

110: second embodiment of stereoscopic display panel according to the present invention

120: third embodiment of stereoscopic display panel according to the present invention

130: transparent region of the slit-shaped transmission region array plate according to the present invention

140: opaque region of the slit-shaped transmission region array plate according to the present invention

200: 3D filter 300: 2D / 3D conversion filter

210: first polarizer 220: second polarizer

310: liquid crystal layer 320: 2D mode of the 2D / 3D conversion filter

330: 3D mode of the 2D / 3D conversion filter 400: Backlight

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

In recent years, a device for displaying a stereoscopic image is required in order to view a realistic and realistic image. In general, in order to view a stereoscopic image, different images are input to the left and right eyes, and the left and right images are synthesized in the observer's head to feel a 3D effect. In order to create a stereoscopic image, a device for displaying different images in the left and right eyes is required. Among them, there is a conventional linear polarization type stereoscopic display apparatus in which left and right eyes are separated and recognized separately by using left and right eyes. However, the three-dimensional method of the glasses method has the inconvenience that the user must wear glasses. Therefore, a method of not wearing glasses has been proposed to solve this problem.

In this case, a lenticular method using a lenticular lens sheet, a parallel method using a slit array sheet, an integral photography method using a micro array sheet, and an interference phenomenon according to a device for separating the parallax image by direction Various stereoscopic imaging methods have been proposed, such as holographic methods.

Among them, the integral photography method and the photography method are considered to be feasible in the future because the amount of data to be processed is so large. Therefore, a lenticular method using a lenticular plate and a parallax barrier method using a slit array sheet are mainly used.

1 illustrates a process of acquiring a parallax image for each direction, and FIGS. 2 to 5 illustrate a stereoscopic image representation of a conventional basic lenticular method.

In the lenticular method illustrated in FIG. 2, a method in which the longitudinal axis 30 of the lenticular lens is parallel to the vertical axis of the flat panel display element is used. The image of the panel is then dropped by d to lie mainly on the focal plane of the lenticular sheet. FIG. 3 illustrates a process of creating a stereoscopic image in a method of using four directional parallax images for explanation. Each direction-specific image (PV1, PV2, PV3, PV4) is arranged in one sub-pixel one direction-specific image. As shown in FIG. 4, the stereoscopic image obtained by the lenticular sheet is decomposed in each direction by the lenticular sheet, and different PVi are respectively recognized by both eyes and felt in stereoscopic form. In this case, as shown in FIG. 5, the vertical resolution has the same resolution as PVi before sampling, but the horizontal resolution is reduced to 1/4. That is, the conventional lenticular method has a disadvantage in that the horizontal resolution is reduced to 1 / n (n: number of PVs). In order to solve this disadvantage, a lenticular method including a lens plate 40 in which the longitudinal axis of the lenticular lens is inclined is proposed as shown in FIG. 6. That is, a method of improving horizontal resolution at the expense of some vertical resolution has been proposed. In FIG. 7, nine directional parallax images (PVs) are used, but the horizontal resolution is reduced to about 1/3 compared to the basic 2D resolution without causing a resolution reduction to about 1/3. However, it can be seen that the vertical resolution is reduced to about 1/3 compared to the conventional vertical lenticular method without any resolution degradation. In other words, the image quality is improved as compared to the conventional method, in view of the balance between the horizontal and vertical resolution degradation. However, even in this method, the resolution is reduced to 1/9 as compared with the existing 2D method, and thus the need for improvement of resolution is required.

In Fig. 7, the parallelogram represents the unit resolution in the tilted lenticular method, and the quadrangle represents the unit resolution in the 2D image. In the case of using the inclined lenticular sheet as described above, there is a crosstalk phenomenon because it is not easy to manufacture and the parallax images for each direction are not easily separated by the aberration of the lenticular lens. Accordingly, a parallax barrier method using a rectangular aperture array sheet 50 in which rectangular transmission regions are arranged as shown in FIG. 8 has been proposed. In this way, the transparent rectangular area 60 and the opaque rectangular area 70 are arranged as shown in FIG. 8 to display a stereoscopic image using the parallax between the left and right eyes through the transparent rectangular area 60. 9 shows the resolution change in the stereoscopic method using the rectangular transmission area array plate 50. In the figure, the parallelogram represents unit resolution. Even in this method, the resolution is balanced horizontally / vertically, but compared to the unit resolution of the 2D image, the area of the unit resolution in the stereoscopic image is about 8 times larger, which is about 1/8 of the width / length overall. It means that a decrease is occurring.

As described above, when 3D is implemented by using a special 3D filter such as a lenticular sheet or a rectangular transmissive region array plate, the resolution is inevitably lowered compared to a 2D image. Improvements are required because parts, especially small letters or spatial fine color variations, cannot be sufficiently represented.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a stereoscopic image display device to reduce the loss of resolution.

Another object of the present invention is to provide a stereoscopic image display device capable of selecting and displaying two-dimensional and three-dimensional images.

In order to achieve the above object, the present invention is due to at least two direction-specific parallax image obtained to implement a stereoscopic image, the RGB sub-pixel of each direction-specific parallax image Sampling and multiplexing the sampled sub-pixels in a predetermined pattern so that the predetermined pattern is repeated in the vertical and horizontal directions, and a transparent area and an opaque area cross diagonally so that the observer's left and right eyes A three-dimensional image is realized by separating the parallax images of the image, and the diagonal line includes a slit-shaped transmission region array plate for maintaining a predetermined angle, and the predetermined slit line and the horizontal line formed by the slit-shaped diagonal line of the transmission region array plate. Angle (Ω) is

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In this case, Hp means a minimum pixel period in the horizontal direction, and Vp means a minimum pixel period in the vertical direction.

Due to the at least two direction-specific parallax images obtained for realizing a stereoscopic image, an RGB sub-pixel of each direction-specific parallax image is sampled, and the sampled sub-pixel is predetermined. Multiplexing the pattern to repeat the predetermined pattern in the vertical and horizontal directions, and transparent and opaque areas intersecting diagonally to separate the parallax image of the observer's left and right eyes The diagonal line maintains a predetermined angle, and includes a slit-shaped transmission region array plate, wherein the transmission region array plate selects an image in 2D and 3D by converting the whole into a transparent pattern and the diagonal pattern. And the predetermined angle (Ω) formed by the slanted diagonal line and the horizontal line of the transmission region array plate is

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Is,

In this case, Hp means a minimum pixel period in the horizontal direction, and Vp means a minimum pixel period in the vertical direction.

Therefore, according to the present invention, compared to the conventional method in the 3D mode by using the 3D filter inclined at a specific angle, it is possible to obtain a resolution improvement of about 2 times or more overall in the vertical and horizontal direction, and adopting the 3D filter without loss of brightness and resolution It can also be used as a 2D general display device.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

FIG. 1 illustrates a process diagram of obtaining n direction-specific parallax images (PVs) using n cameras in a stereoscopic system of glasses-free method.

Referring to FIG. 1, n cameras C1, C2, and C3 are used to obtain images according to n directions (hereinafter referred to as parallax images for each direction, Perspective View, PV1, PV2 .... PVn), and use them. By sampling the image data from each PVi according to a specific rule to create a three-dimensional image. In this case, the more stereoscopic images for each direction are used, the wider the stereoscopic space that can be viewed in stereo. However, since the number of pixels is fixed in the two-dimensional flat panel display device for displaying an image, the resolution of the stereoscopic image is generally reduced in inverse proportion to the number of parallax images for each direction used. Therefore, the resolution of the stereoscopic image decreases in inverse proportion to the number of parallax images for each direction used. Therefore, the number of parallax images for each direction used is traded off in consideration of the resolution (pixel count) of the flat panel display element.

10, 11, and 12 illustrate patterns of data of parallax images for each direction of a stereoscopic image panel, and FIGS. 13 and 14 show disparity images of a left eye and a right eye separated by a slit-shaped transmission region array plate. Show the image.

According to the present invention, due to at least two direction-specific parallax images obtained for realizing a stereoscopic image, an RGB sub-pixel of each direction-specific parallax image is sampled, and the sampled sub Multiplexing the pixels in a predetermined pattern, the stereoscopic image panel for repeating the predetermined pattern in the vertical and horizontal directions, and the transparent region and the opaque region intersect diagonally so that the parallax image of the viewer's left and right eyes is separated. The slanting line includes an slit-shaped transmission area array plate for implementing an image, and maintaining the predetermined angle. That is, a stereoscopic image is generated by sampling and multiplexing from the parallax images for each direction and combining a slit-shaped transmission region array plate inclined at a specific angle to implement a stereoscopic image.

Referring to FIG. 10, the stereoscopic image panel may be formed by generating a stereoscopic image 100 having the predetermined pattern and displaying the same on a flat panel display device.

The predetermined pattern displayed on the stereoscopic image panel 100 is multiplexed by sampling a sub pixel of each position in the obtained n direction parallax images, and placing them in a parallelogram shape.

The predetermined pattern displayed on the three-dimensional panel is disposed in an oblique direction, and an angle formed by diagonal lines and horizontal lines connecting the same abutment of the parallax image of the same direction used at the same position of the parallelogram patterns adjacent to each other up and down ( Ω)

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In this case, Hp means a minimum pixel period in the horizontal direction, and Vp means a minimum pixel period in the vertical direction. That is, when sampling and multiplexing each subpixel in n direction parallax images, the angle of the diagonal line formed by the subpixel of each direction parallax image means a stereoscopic image pattern of the stereoscopic image panel.

If there are at least two parallax images for each direction, stereoscopic images may be expressed. The parallax image for each direction for generating a stereoscopic image pattern according to the present invention satisfies a multiple of three. In the present invention, 12, 15 or 18 examples are provided.

FIG. 11 illustrates an embodiment of a stereoscopic image using the stereoscopic image panel 110 when there are 12 parallax images for each direction.

When there are 12 parallax images for each direction used in the stereoscopic image panel, three pixels in the vertical direction and four lines in the horizontal direction constitute a unit of one pattern.

FIG. 10 illustrates an embodiment of implementing a stereoscopic image using the stereoscopic image panel 100 when there are 15 parallax images for each direction.

When there are 15 parallax images for each direction used in the stereoscopic image panel, subpixels of 3 lines in the vertical direction and 5 lines in the horizontal direction become a unit of a pattern.

FIG. 12 illustrates an embodiment of a stereoscopic image using the stereoscopic image panel 120 when there are 18 parallax images for each direction.

When there are 18 disparity images for each direction used in the 3D image panel, subpixels of 3 lines in the vertical direction and 6 lines in the horizontal direction become a unit of a pattern.

Hereinafter, an exemplary embodiment of a stereoscopic image using the stereoscopic image panel 100 in the case of 15 parallax images for each direction will be described.

The parallelogram pattern maintains the same pattern to be repeated in the horizontal and vertical directions. In this case, a predetermined pattern displayed on the stereoscopic image panel is continuously arranged adjacent to each other in the horizontal direction, the structural unit adjacent to the vertical direction by moving one sub-pixel horizontally disparity image by the same direction Let it repeat That is, referring to FIG. 10, in the parallelogram pattern at the top and bottom, the parallax image for each direction is not located at the same RGB subpixel, but the subpixel below is shifted by one subpixel.

The stereoscopic image panel is combined with a slit-shaped transmission region array plate to implement a stereoscopic image.

FIG. 13 illustrates an image in which the parallax image for each direction is separated and shown in the left eye, and FIG. 14 illustrates an image in which the parallax image for each direction is separated and shown in the right eye according to the present invention. In the present invention, the position of the green pixel of the stereoscopic image seen by the viewer in the 3D mode is shown.

Referring to FIGS. 13 and 14, in the slit-shaped transmission region array plate, the transparent region 130 and the opaque region 140 cross diagonally so that the parallax image of the observer's left and right eyes is separated. The image is realized, and the observer feels three-dimensionally by the parallax of the image recognized by the left and right eyes.

The diagonal line maintains a predetermined angle, and the predetermined angle Ω formed by the diagonal line and the horizontal line formed by the transparent region 130 and the opaque region 140 of the slit-shaped transmission region array plate is

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In this case, Hp means a minimum pixel period in the horizontal direction, and Vp means a minimum pixel period in the vertical direction.

Referring to FIG. 15, when viewing the position of the green pixel of the stereoscopic image seen by the observer in the 3D mode, the resolution of the stereoscopic image may be examined. That is, the parallelogram of FIG. 15 represents unit resolution, and the area is about 3.3 times larger than the unit resolution in the basic 2D image. This means that in 3D mode, the resolution is reduced to about 1 / 3.3 overall horizontally and vertically. However, it can be seen that the resolution is improved by more than twice compared to the conventional slanted lenticular method 1 / 8.9 and the rectangular transmission area method 1 / 8.0.

The slit-shaped transmission region array plate may be formed in the filter of the flat panel display device. That is, the stereoscopic image panel is displayed on the flat panel display panel, and the slit-shaped transmissive region array plate is configured by the filter 200 or 300, and can be used for the flat panel display device.

The filter may include a polarizer and a liquid crystal layer. The polarizing plate may exist in singular or in two. That is, it may be composed of a polarized one and a liquid crystal layer, or may be composed of a polarizing plate 210, a liquid crystal layer 310, and a polarizing plate. This is because the polarizer on the image panel side is not an essential component. Since there is a polarizing plate in the image panel, it is possible to use it, so that the filter can be configured only with the polarizing plate and the liquid crystal layer, and if the polarizing plate is also used for the image panel side, the contrast can be improved. You may.

The slit-shaped transmission region array plate should maintain a constant distance d from the stereoscopic image panel. This means that the transmissive region array plate does not contact the stereoscopic image panel.

The slit-shaped transmission region array plate may be located at the rear of the stereoscopic image panel, or may be disposed in front of the stereoscopic image panel as shown in FIG. 19.

When the slit-shaped transmissive region array plate is used exclusively for 3D mode (200), the diagonal pattern is applied to any one of a film, a plastic, or a glass without using a liquid crystal layer. Can be implemented by marking

Referring to FIGS. 18A and 18B, the slit-shaped transmission region array plate may be implemented as a filter 300 that is switchable to each other in 2D / 3D instead of 3D only. This means that if the user wants to watch a stereoscopic image, the filter is selected in 3D mode, and if the user wants to watch a normal image, the filter is selected in 2D mode, so that a single display device can display a general image and a stereoscopic image. do. When the oblique pattern is present in the filter, a three-dimensional stereoscopic image is displayed. When the oblique pattern is removed, a two-dimensional image is displayed. This can be achieved by using a liquid crystal layer in the filter. By making the whole transparent using a liquid crystal layer, the said diagonal pattern is removed.

The number of parallax images for each direction used in the description of the present invention has been described with respect to 15 direction parallax images for clarity, but 18 and 24 may be determined and explained. In addition, the stereoscopic image production method proposed in the present invention can be applied not only to the case of the 2D / 3D switchable filter, but also to the 3D-only 3D monitor system.

The present invention is not limited to the above-described embodiments, and can be modified by those skilled in the art as can be seen from the appended claims, and such modifications are within the scope of the present invention. .

The effects of the stereoscopic image display device according to the present invention described above are as follows.

First, by using a 3D filter tilted at a certain angle, a resolution improvement of about 2 times or more can be achieved in comparison with the conventional method in 3D mode.

Second, by adopting a 3D filter can be used as a general display device of 2D without loss of brightness and resolution.

Claims (19)

Due to the at least two direction-specific parallax images obtained for realizing a stereoscopic image, an RGB sub-pixel of each direction-specific parallax image is sampled, and the sampled sub-pixel is predetermined. A stereoscopic image panel multiplexed in a pattern so that the predetermined pattern is repeated in the vertical and horizontal directions; The transparent region and the opaque region intersect diagonally to separate the parallax images of the left eye and the right eye of the observer, thereby implementing a stereoscopic image, wherein the diagonal line includes a slit-shaped transmission region array plate for maintaining a predetermined angle. The predetermined angle Ω formed by the slit diagonal line and the horizontal line of the transmission region array plate is

Is, In this case, Hp means a minimum pixel period in the horizontal direction, Vp means a minimum pixel period in the vertical direction. Due to the at least two direction-specific parallax images obtained for realizing a stereoscopic image, an RGB sub-pixel of each direction-specific parallax image is sampled, and the sampled sub-pixel is predetermined. A stereoscopic image panel multiplexed in a pattern so that the predetermined pattern is repeated in the vertical and horizontal directions; The transparent region and the opaque region intersect diagonally to separate the parallax image of the left eye and the right eye of the observer, thereby implementing a stereoscopic image. The diagonal line maintains a predetermined angle, and includes a slit-shaped transmission region array plate. The transmissive area array plate converts the whole into a transparent pattern and an oblique pattern so as to select and display an image in two and three dimensions. The predetermined angle Ω formed by the slit diagonal line and the horizontal line of the transmission region array plate is

Is, In this case, Hp means a minimum pixel period in the horizontal direction, Vp means a minimum pixel period in the vertical direction. The method according to claim 1 or 2, The stereoscopic image panel generates a stereoscopic image of the predetermined pattern and displays the same on a flat panel display device such as LCD or LCD. The method according to claim 1 or 2, The predetermined pattern displayed on the stereoscopic image panel includes at least one direction-specific parallax image data in a parallelogram shape, so that the same pattern is repeated in the horizontal and vertical directions while maintaining the same pattern. . The method of claim 4, wherein Predetermined patterns displayed on the stereoscopic image panel are consecutively arranged adjacent to each other in the horizontal direction, and the adjacent units in the vertical direction are repeated by moving one sub-pixel horizontally in the same direction parallax image Stereoscopic display device characterized in that. The method according to claim 1 or 2, The number of parallax images for each direction used in the stereoscopic image panel satisfies a multiple of three. The method according to claim 1 or 2, When there are 12 parallax images for each direction used in the 3D image panel, a 3D image having three lines in a vertical direction and 4 lines in a horizontal direction becomes a unit of a pattern. Display device. The method according to claim 1 or 2, When there are 15 parallax images for each direction used in the stereoscopic image panel, a three-dimensional subpixel in a vertical direction and five lines in a horizontal direction become a unit of configuration of one pattern. Video display device. The method according to claim 1 or 2, When there are 18 parallax images for each direction used in the stereoscopic image panel, the stereoscopic image is characterized in that a subpixel having three lines in the vertical direction and six lines in the horizontal direction becomes a unit of a pattern. Display device. The method according to claim 1 or 2, In a predetermined pattern used for the stereoscopic image panel, an angle (Ω) formed by diagonal lines and horizontal lines connecting disparity images for the same direction used at mutually identical positions of vertically adjacent patterns is

Is, In this case, Hp means a minimum pixel period in the horizontal direction, Vp means a minimum pixel period in the vertical direction. The method according to claim 1 or 2, And the slit-shaped transmissive region array plate is formed in a filter of a flat panel display device. The method of claim 11, The filter includes a polarizing plate and a liquid crystal layer. The method of claim 12, The filter further comprises a polarizing plate adjacent to the image panel. The method of claim 1, The slit-shaped transmissive region array plate displays the diagonal pattern on any one of a film, a plastic, and a glass. The method of claim 2, And displaying a three-dimensional stereoscopic image when the diagonal pattern of the slit-shaped transmission region array plate is present, and displaying a two-dimensional image when the diagonal pattern is removed. The method of claim 2, And the removal of the oblique pattern of the slit-shaped transmissive region array plate is based on a liquid crystal layer. The method according to claim 1 or 2, And the slit-shaped transmission region array plate is disposed in front of the stereoscopic image panel. The method according to claim 1 or 2, And the slit-shaped transmissive region array plate is disposed on a rear surface of the stereoscopic image panel. The method according to claim 1 or 2, And the stereoscopic image panel and the slit-shaped transmission region array plate are spaced apart from each other.

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