KR102692935B1 - Volumetric image display device realizing a stereoscopic image by stacking images - Google Patents

Abstract

The present invention relates to a stereoscopic image display device that implements a stereoscopic image by stacking images by respective display panels. The stereoscopic image display device includes a first display panel that implements a first image and a second display panel that implements a second image. The second display panel may be spaced apart from the first display panel. A first hologram optical element and a light guide plate may be positioned on the second display panel. A second hologram optical element may be positioned on the first display panel. The light guide plate may extend between the first display panel and the second hologram optical element. Accordingly, in the stereoscopic image display device, the second image may be moved onto the first image. Therefore, in the stereoscopic image display device of the present invention, deterioration of the quality of the first image by the second display panel can be prevented.

Description

{Volumetric image display device realizing a stereoscopic image by stacking images}

The present invention relates to a stereoscopic image display device that implements a stereoscopic image by stacking images by each display panel.

Typically, a display device includes a display panel that implements an image. For example, the display device may include a liquid crystal panel including liquid crystals and/or an OLED panel including light-emitting elements.

The display device can implement a stereoscopic image. For example, a volumetric image display device can provide a final image having a stereoscopic effect to a viewer by stacking a first image by a first display panel and a second image by a second display panel. The second display panel can have a spatial distance from the first display panel. For example, in the stereoscopic image display device, the second display panel can be located between the first display panel and the viewer.

However, in the stereoscopic image display device, since the first image is provided to the viewer by passing through the second display panel, the resolution of the image provided to the viewer may be reduced. In addition, since at least one optical film must be used to prevent moire due to the wiring of the second display panel, the brightness of the image provided to the viewer may be reduced. In addition, in the stereoscopic image display device, since the three-dimensionality of the image provided to the viewer is proportional to the distance between the first display panel and the second display panel, the overall thickness may increase.

The problem to be solved by the present invention relates to a stereoscopic image display device capable of improving the quality of a stereoscopic image implemented through the stacking of images.

Another problem that the present invention seeks to solve is to provide a stereoscopic image display device capable of reducing the overall thickness while maintaining the three-dimensionality of the image provided to the viewer.

The problems to be solved by the present invention are not limited to the problems mentioned above. Problems not mentioned herein will be clearly understood by those skilled in the art from the description below.

According to the technical idea of the present invention for achieving the above-mentioned problem, a stereoscopic image display device includes a first display unit and a second display unit. The first display unit implements a first image. The second display unit implements a second image. The second image is implemented on the first image. The second display unit includes a display panel, a first holographic optical element, a light guide plate, and a second holographic optical element. The display panel is spaced apart from the first display unit. The first holographic optical element is located between the display panel and the light guide plate. The second holographic optical element overlaps the first display unit. The light guide plate extends between the first display unit and the second holographic optical element.

The first holographic optical element and the second holographic optical element can be in contact with the light guide plate.

The second display unit may further include a backlight unit that supplies light to the display panel.

The backlight unit may include a laser light source.

The display panel may include a spatial light modulator.

The spatial light modulator may be a stacked structure of an optical modulator for amplitude modulation and an optical modulator for phase modulation.

The display panel can be positioned parallel to the first display unit.

A third image may be implemented on the second image. The third image may be implemented by a third display unit. The third display unit may have the same structure as the second display unit.

According to the technical idea of the present invention to achieve another object to be solved by the present invention, a stereoscopic image display device includes a light guide plate. The light guide plate includes a first region and a second region. The second region is located outside the first region. A first display panel overlaps the first region of the light guide plate. A second display panel is located on the second region of the light guide plate. A first holographic optical element is located between the light guide plate and the second display panel. The second holographic optical element is located on a surface of the light guide plate facing the first display panel. The second holographic optical element overlaps the first region of the light guide plate.

The first holographic optical element can be positioned parallel to the second holographic optical element.

The second display panel may have a different structure from the first display panel.

The first display panel may include a lower display substrate, a light-emitting element, and an upper display substrate, which are sequentially laminated.

The horizontal length of the second region may be less than the horizontal length of the first region.

The size of the second display panel may be smaller than the size of the first display panel.

In a stereoscopic image display device according to the technical idea of the present invention, a first image by a first display panel can be laminated with a second image by a second display panel without passing through the second display panel by a first holographic optical element, a light guide plate, and a second holographic optical element. Accordingly, in a stereoscopic image display device according to the technical idea of the present invention, a deterioration in the quality of a final image by the second display panel can be prevented. In addition, in a stereoscopic image display device according to the technical idea of the present invention, a three-dimensional effect of a final image provided to a viewer may not be affected by the distance between the first display panel and the second display panel. Therefore, in a stereoscopic image display device according to the technical idea of the present invention, an overall thickness can be reduced.

FIG. 1 is a drawing schematically illustrating a stereoscopic image display device according to an embodiment of the present invention.
Figure 2a is an enlarged view of area P of Figure 1.
Figure 2b is an enlarged view of area R in Figure 1.
FIG. 3 is a drawing showing images by a first display panel and a second display panel of a stereoscopic image display device according to an embodiment of the present invention.
FIGS. 4 and 5 are drawings showing a stereoscopic image display device according to another embodiment of the present invention, respectively.

The above-described purpose and technical configuration of the present invention and the detailed operation and effect thereof will be more clearly understood by the following detailed description with reference to the drawings illustrating embodiments of the present invention. Here, the embodiments of the present invention are provided so that the technical idea of the present invention can be sufficiently conveyed to those skilled in the art, and therefore the present invention may be embodied in other forms without being limited to the embodiments described below.

Also, parts denoted by the same reference numerals throughout the specification represent the same components, and the lengths and thicknesses of layers or regions in the drawings may be exaggerated for convenience. In addition, when it is described that a first component is "on" a second component, it includes not only the case where the first component is located on the upper side in direct contact with the second component, but also the case where a third component is located between the first component and the second component.

Here, the terms first, second, etc. are used to describe various components and are used for the purpose of distinguishing one component from another. However, within the scope that does not deviate from the technical idea of the present invention, the first component and the second component may be arbitrarily named according to the convenience of those skilled in the art.

The terminology used in the specification of the present invention is only used to describe specific embodiments and is not intended to limit the present invention. For example, a component expressed in the singular includes plural components unless the context clearly indicates only the singular. Furthermore, in the specification of the present invention, it should be understood that the terms "comprise" or "have" and the like are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms defined in commonly used dictionaries, such as those defined in common dictionaries, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and shall not be interpreted in an idealized or overly formal sense, unless explicitly defined in the specification of the present invention.

(Example)

FIG. 1 is a schematic diagram of a stereoscopic image display device according to an embodiment of the present invention. FIG. 2a is an enlarged diagram of area P of FIG. 1. FIG. 2b is an enlarged diagram of area R of FIG. FIG. 3 is a diagram showing images by a first display panel and a second display panel of a stereoscopic image display device according to an embodiment of the present invention.

Referring to FIGS. 1, 2a, 2b and 3, a stereoscopic image display device according to an embodiment of the present invention may include a first display unit (DP1). The first display unit (DP1) may implement a first image (V1). For example, the first display unit (DP1) may include a first display panel (100).

The first display panel (100) can emit light for implementing the first image (V1). For example, the first display panel (110) can include a lower display substrate (110), a light-emitting element (140), and an upper display substrate (170) that are sequentially stacked.

The light-emitting element (140) can emit light representing a specific color. For example, the light-emitting element (140) can include a lower light-emitting electrode (141), a light-emitting layer (142), and an upper light-emitting electrode (143) that are sequentially stacked. The light-emitting layer (142) can generate light having a brightness corresponding to a voltage difference between the lower light-emitting electrode (141) and the upper light-emitting electrode (143). The light-emitting layer (142) can include an organic light-emitting material or an inorganic light-emitting material. For example, the first display panel (DP1) of the stereoscopic image display device according to an embodiment of the present invention can be an OLED panel including an organic light-emitting material.

A thin film transistor (120) and an overcoat layer (130) may be positioned between the lower display substrate (110) and the light-emitting element (140). The thin film transistor (120) may supply a driving current corresponding to a data signal to the light-emitting element (140) according to a gate signal. The overcoat layer (130) may remove a step by the thin film transistor (120). For example, the thin film transistor (120) may be completely covered by the overcoat layer (130). The light-emitting element (140) may be positioned on the overcoat layer (130). For example, the overcoat layer (130) may include a contact hole exposing a part of the thin film transistor (120).

The first display panel (100) may include a plurality of light-emitting elements (140). Each light-emitting element (140) may be driven independently of adjacent light-emitting elements (140). For example, an edge of the lower light-emitting electrode (141) of each light-emitting element (140) may be covered by a bank insulating film (150). The light-emitting layer (142) and the upper light-emitting electrode (143) may be laminated on a portion of the lower light-emitting electrode (141) exposed by the bank insulating film (150). The light-emitting layer (142) and the upper light-emitting electrode (143) may extend onto the bank insulating film (150).

A sealing member (160) may be positioned on the light-emitting element (140). The sealing member (160) may prevent damage to the light-emitting element (140) due to external moisture and impact. The sealing member (160) may have a multilayer structure. For example, the sealing member (160) may include a first sealing layer (161), a second sealing layer (162), and a third sealing layer (163) sequentially laminated on the light-emitting element (140).

The first sealing layer (161), the second sealing layer (162), and the third sealing layer (163) may include an insulating material. The second sealing layer (162) may include a different material from the first sealing layer (161) and the third sealing layer (163). For example, the first sealing layer (161) and the third sealing layer (163) may be inorganic insulating films formed of an inorganic insulating material, and the second sealing layer (162) may be an organic insulating film formed of an organic insulating material.

A second image (V2) can be implemented on the first image (V1) by the first display unit (DP1). Accordingly, in a stereoscopic image display device according to an embodiment of the present invention, a final image in which the first image (V1) and the second image (V2) are laminated can be provided to the viewer. Accordingly, in the stereoscopic image display device according to an embodiment of the present invention, the viewer can feel a three-dimensional effect due to the physical space difference between the first image (V1) and the second image (V2). The second image (V2) can be implemented by the second display unit (DP2). For example, the second display unit (DP2) can include a second display panel (200), a light guide plate (300), a first hologram optical element (410), and a second hologram optical element (420).

The second display panel (200) may be spaced apart from the first display portion (DP1). The second display panel (200) may be positioned outside the first display portion (DP1). The second display panel (200) may not overlap the display surface (100s) of the first display panel (100). For example, the display surface (200s) of the second display panel (200) may be positioned parallel to the display surface (100s) of the first display panel (100). Accordingly, in the stereoscopic image display device according to the embodiment of the present invention, the first image (V1) by the first display portion (DP1) may not pass through the second display panel (200). Therefore, in the stereoscopic image display device according to the embodiment of the present invention, the reduction in brightness and occurrence of moire of the first image (V1) due to the second display panel (200) can be prevented.

The second image (V2) may be a holographic image. For example, the second display panel (200) may include a spatial light modulator (SLM) and a backlight unit (BLU) that supplies light to the spatial light modulator (SLM). The spatial light modulator (SLM) may modulate amplitude and/or phase of light supplied from the backlight unit (BLU). For example, the spatial light modulator (SLM) may have a laminated structure of an amplitude modulator (210) and a phase modulator (220).

The above-described amplitude modulation light modulator (210) can modulate the amplitude of light supplied from the backlight unit (BLU). For example, the brightness by the light supplied from the backlight unit (BLU) can be adjusted by the amplitude modulation light modulator (210). The amplitude modulation light modulator (210) can include a liquid crystal. For example, the amplitude modulation light modulator (210) can include an amplitude modulation liquid crystal layer (213) positioned between a first amplitude modulation substrate (211) and a second amplitude modulation substrate (212).

The first amplitude modulation substrate (211) and the second amplitude modulation substrate (212) may include an insulating material. The first amplitude modulation substrate (211) and the second amplitude modulation substrate (212) may include a transparent material. For example, the first amplitude modulation substrate (211) and the second amplitude modulation substrate (212) may include glass or plastic. The second amplitude modulation substrate (212) may include a different material from the first amplitude modulation substrate (211).

The above-described amplitude modulation light modulator (210) may be positioned between the first polarizing film (231) and the second polarizing film (232). The transmission axis of the second polarizing film (232) may be perpendicular to the transmission axis of the first polarizing film (231). Accordingly, in the stereoscopic image display device according to the embodiment of the present invention, the clarity of the second image (V2) implemented by the second display panel (200) may be improved.

The above-described phase modulation optical modulator (220) can modulate the phase of light passing through the amplitude modulation optical modulator (210). For example, the amplitude modulation optical modulator (210) can be positioned between the backlight unit (BLU) and the phase modulation optical modulator (220). The phase modulation optical modulator (220) can include a liquid crystal. For example, the phase modulation optical modulator (220) can include a phase modulation liquid crystal layer (223) positioned between a first phase modulation substrate (221) and a second phase modulation substrate (222).

The first phase modulation substrate (221) and the second phase modulation substrate (222) may include an insulating material. The first phase modulation substrate (221) and the second phase modulation substrate (222) may include a transparent material. For example, the first phase modulation substrate (221) and the second phase modulation substrate (222) may include glass or plastic. The second phase modulation substrate (222) may include a different material from the first phase modulation substrate (221).

The liquid crystal layer (223) for phase modulation may include a different liquid crystal from the liquid crystal layer (213) for amplitude modulation. For example, the liquid crystal layer (213) for amplitude modulation may include a liquid crystal in IPS mode, and the liquid crystal layer (223) for phase modulation may include a liquid crystal in ECB mode.

The backlight unit (BLU) can supply coherent light to the second display panel (200). The backlight unit (BLU) can evenly supply light to the front of the spatial light modulator (SLM). For example, the backlight unit (BLU) can include a laser light source and an optical fiber (240) connected to the laser light source. The optical fiber (240) can include a light emission portion (240h) that is uniformly arranged.

The light guide plate (300) may be positioned on the display surface (200s) of the second display panel (200). The light guide plate (300) may extend onto the display surface (100s) of the first display panel (100). For example, the light guide plate (300) may include a first region (R1) overlapping the first display panel (100) and a second region (R2) positioned outside the first region (R1). The second display panel (200) may be positioned on the second region (R2) of the light guide plate (300). That is, in the stereoscopic image display device according to the embodiment of the present invention, the first image (V1) by the first display unit (DP1) may pass through the first region (R1) of the light guide plate (300) and be provided to the viewer.

The light guide plate (300) may include a transparent material. Accordingly, in a stereoscopic image display device according to an embodiment of the present invention, a decrease in brightness of the first image (V1) provided to a viewer through the light guide plate (300) can be prevented.

The first hologram optical element (410) and the second hologram optical element (420) can refract light that meets the recorded conditions in a certain direction. For example, the first hologram optical element (410) and the second hologram optical element (420) can move light emitted from the second display panel (200) onto the first image (V1) by using the light guide plate (300). For example, the light guide plate (300) can function as a movement path for light emitted from the second display panel (200).

The first hologram optical element (410) may be positioned between the second display panel (200) and the light guide plate (300). For example, the first hologram optical element (410) may overlap the second region (R2) of the light guide plate (300). Light emitted by the second display panel (200) may be totally reflected within the light guide plate (300) by the first hologram optical element (410). The first hologram optical element (410) may be in direct contact with the light guide plate (300). For example, the surface of the second region (R2) of the light guide plate (300) facing the second display panel (200) may be covered by the first hologram optical element (410).

The second hologram optical element (420) may be positioned on the first image (V1). For example, the second hologram optical element (420) may overlap the first display portion (DP1). Light totally reflected within the light guide plate (300) may be emitted from the light guide plate (300) by the second hologram optical element (420). For example, the first region (R1) of the light guide plate (300) may be positioned between the first display panel (100) and the second hologram optical element (420). The second hologram optical element (420) may be in direct contact with the light guide plate (300). For example, the surface of the first region (R1) of the light guide plate (300) facing the first display portion (DP1) may be covered by the second hologram optical element (420). Accordingly, in the stereoscopic image display device according to the embodiment of the present invention, the second image (V2) by the second display panel (200) may be implemented on the first image (V1) by the light guide plate (300), the first hologram optical element (410), and the second hologram optical element (420). Therefore, in the stereoscopic image display device according to the embodiment of the present invention, the second image (V2) by the second display panel (200) may be implemented on the first image (V1) without deterioration of the quality of the first image (V1) by the second display panel (200).

The first region (R1) of the light guide plate (300) may have a larger size than the display surface (100s) of the first display panel (100). Since light emitted from the second display panel (200) is refracted by the first hologram optical element (410) and the second hologram optical element (420), the size of the second image (V2) implemented on the outer surface of the second hologram optical element (420) may be larger than the display surface (200s) of the second display panel (200). For example, the second region (R2) of the light guide plate (300) may have a smaller size than the first region (R1) of the light guide plate (300). The second display panel (200) may have a smaller size than the first display panel (100). Accordingly, in a stereoscopic image display device according to an embodiment of the present invention, the overall space efficiency can be improved.

In a stereoscopic image display device according to an embodiment of the present invention, the horizontal distance (d) between the first image (V1) and the second image (V2) may not be affected by the first display panel (100) and the second display panel (200). Accordingly, in a stereoscopic image display device according to an embodiment of the present invention, the three-dimensional effect of the image provided to the viewer is maintained, and the overall thickness can be reduced.

In addition, in the stereoscopic image display device according to the embodiment of the present invention, since the second image (V2) is a holographic image, the second image (V2) may be implemented in a space spaced apart from the second holographic optical element (420) by a certain distance. For example, in the stereoscopic image display device according to the embodiment of the present invention, the horizontal distance (d) between the first image (V1) and the second image (V2) may be greater than the horizontal distance between the display surface (100s) of the first display panel (100) and the outer surface of the second holographic optical element (420). Accordingly, in the stereoscopic image display device according to the embodiment of the present invention, the overall thickness may be effectively reduced.

In addition, in the stereoscopic image display device according to an embodiment of the present invention, since the second display unit (DP2) implements the second image (V2) by using the straight light provided by the backlight unit (BLU) including a laser light source, most of the light emitted from the second display panel (200) can meet the recorded conditions of the first hologram optical element (410) and the second hologram optical element (420). Accordingly, in the stereoscopic image display device according to an embodiment of the present invention, light loss due to the light guide plate (300), the first hologram optical element (410) and the second hologram optical element (420) can be minimized. Therefore, in the stereoscopic image display device according to an embodiment of the present invention, a decrease in brightness of the second image (V2) can be prevented.

As a result, a stereoscopic image display device according to an embodiment of the present invention may include a second display unit (DP2) that implements a second image (V2) on a first image (V1) by a first display unit (DP1), wherein the second display unit (DP2) does not overlap with a display surface (100s) of the first display unit (DP1), a second display panel (200), a first hologram optical element (410) positioned on the second display panel (200), a second hologram optical element (420) that overlaps the first display unit (DP1), and a light guide plate (300) that transmits light between the first hologram optical element (410) and the second hologram optical element (420). Accordingly, in a stereoscopic image display device according to an embodiment of the present invention, a final image having a three-dimensional effect is provided to a viewer by laminating the first image (V1) and the second image (V2), while the quality of the final image can be prevented from being degraded by the second display panel (200). In addition, in a stereoscopic image display device according to an embodiment of the present invention, the three-dimensional effect of the final image provided to the viewer is maintained, space efficiency is improved, and the overall thickness can be reduced.

In a stereoscopic display device according to an embodiment of the present invention, the first display panel (100) is an OLED panel and the second display panel (200) includes a spatial light modulator (SLM). However, in a stereoscopic display device according to another embodiment of the present invention, the second display panel (200) may have the same structure as the first display panel (100). For example, in a stereoscopic display device according to another embodiment of the present invention, the second display panel (200) may be an OLED panel. For example, in a stereoscopic display device according to another embodiment of the present invention, the first display panel (100) may include a spatial light modulator (SLM). Accordingly, in a stereoscopic display device according to another embodiment of the present invention, the diversity of the first display panel (100) and the second display panel (200) may be improved.

The stereoscopic image display device according to an embodiment of the present invention is described as having the second display panel (200) positioned parallel to the first display panel (100). However, in a stereoscopic image display device according to another embodiment of the present invention, the display surface of the second display panel (200) may face a different direction from the display surface of the first display panel (100). For example, as illustrated in FIG. 4, in a stereoscopic image display device according to another embodiment of the present invention, the second display panel (200) may be positioned on a surface of a light guide plate (300) facing the first display portion (DP1). The first hologram optical element (410) positioned between the second display panel (200) and the light guide plate (300) may be positioned parallel to the second hologram optical element (420). For example, the first hologram optical element (410) and the second hologram optical element (420) may be in contact with the same surface of the light guide plate (300). Accordingly, in a stereoscopic image display device according to another embodiment of the present invention, the second display unit (DP2) may be configured in various ways. Accordingly, in a stereoscopic image display device according to another embodiment of the present invention, the stereoscopic effect of the final image provided to the viewer may be maintained, and the usability of the space may be improved.

The stereoscopic image display device according to an embodiment of the present invention is described as having two images (V1, V2) laminated. However, in a stereoscopic image display device according to another embodiment of the present invention, a plurality of images (V2, V3) having different physical spatial differences from the first image (V1) may be implemented on the first image (V1). For example, as illustrated in FIG. 5, in a stereoscopic image display device according to another embodiment of the present invention, a third display unit (DP3) may be positioned on a second display unit (DP2). The third display unit (DP3) may have the same structure as the second display unit (DP2). For example, the third display unit (DP3) may include a third display panel (500), a light guide plate (600), a first hologram optical element (710), and a second hologram optical element (720). The first hologram optical element (710) may be positioned between the third display panel (500) and the light guide plate (600). The second hologram optical element (720) may overlap the first display portion (DP1). The light guide plate (600) may extend between the first display portion (DP1) and the second hologram optical element (720). Accordingly, in a stereoscopic image display device according to another embodiment of the present invention, the three-dimensional effect of the final image provided to the viewer may be more effectively implemented.

In a stereoscopic image display device according to an embodiment of the present invention, the second image (V2) is described as having a size that is almost the same as that of the first image (V1). However, in a stereoscopic image display device according to another embodiment of the present invention, at least one image (V2, V3) having a different size from that of the first image (V1) may be implemented on the first image (V1). For example, as illustrated in FIG. 5, in a stereoscopic image display device according to another embodiment of the present invention, the second hologram optical element (420) of the second display unit (DP2) and the second hologram optical element (720) of the third display unit (DP3) may have a smaller size than that of the first display panel (100). The second hologram optical element (720) of the third display unit (DP3) may not overlap with the second hologram optical element (420) of the second display unit (DP2). Accordingly, in a stereoscopic image display device according to another embodiment of the present invention, images (V2, V3) having a physical space difference can be implemented on the first image (V1). Accordingly, in a stereoscopic image display device according to another embodiment of the present invention, a three-dimensional effect of a final image provided to a viewer can be effectively implemented.

DP1: First display section 100: First display panel
DP2: Second display unit 200: Second display panel
300: Light guide plate 410: First holographic optical element
420: Second holographic optical element V1: First image
V2: Second Image

Claims (14)

a first display unit implementing the first image; and
Including a second display unit that implements a second image on the first image,
The second display portion includes a display panel spaced apart from the first display portion, a light guide plate positioned on the display panel, a first hologram optical element positioned between the display panel and the light guide plate, and a second hologram optical element overlapping the first display portion.
The above light guide plate extends between the first display portion and the second holographic optical element,
The first display portion and the second display portion are spaced apart from each other and do not overlap,
A stereoscopic image display device in which the first holographic optical element and the second holographic optical element are arranged on different surfaces above and below the light guide plate. In paragraph 1,
A stereoscopic image display device in which the first holographic optical element and the second holographic optical element are in contact with the light guide plate. In the first paragraph,
A stereoscopic image display device, wherein the second display section further includes a backlight unit that supplies light to the display panel. In the third paragraph,
The above backlight unit is a stereoscopic image display device including a laser light source. In the third paragraph,
The above display panel is a stereoscopic image display device including a spatial light modulator. In paragraph 5,
The above spatial light modulator is a stereoscopic image display device having a laminated structure of an amplitude modulation light modulator and a phase modulation light modulator. delete In paragraph 1,
Further comprising a third display unit that implements a third image on the second image,
A stereoscopic image display device wherein the third display section has the same structure as the second display section. A light guide plate including a first region overlapping a first display panel and a second region positioned outside the first region;
A second display panel positioned on the second area of the light guide plate;
a first holographic optical element positioned between the light guide plate and the second display panel; and
A second holographic optical element is positioned on the surface of the light guide plate facing the first display panel,
The first display panel and the second display panel are spaced apart from each other and do not overlap,
A stereoscopic image display device in which the first holographic optical element and the second holographic optical element are arranged on different surfaces above and below the light guide plate. delete In Article 9,
A stereoscopic image display device wherein the second display panel has a different structure from the first display panel. In Article 11,
The above first display panel is a stereoscopic image display device including a lower display substrate, a light-emitting element, and an upper display substrate laminated in sequence. In Article 9,
A stereoscopic image display device wherein the horizontal length of the second region is smaller than the horizontal length of the first region. In Article 13,
A stereoscopic image display device wherein the size of the second display panel is smaller than the size of the first display panel.

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