KR20240126786A - Hologram sheet and hologram display apparatus having thereof - Google Patents

Abstract

The present invention relates to a hologram sheet and a hologram display device having the same, characterized by including a prism array that refracts light incident from the outside, and a reflection sheet that is arranged to face the prism array and reflects the light refracted by the prism array to generate a floating image in space.

Description

{HOLOGRAM SHEET AND HOLOGRAM DISPLAY APPARATUS HAVING THEREOF}

The present invention relates to a hologram sheet and a hologram display device having the same, and more specifically, to a hologram sheet capable of being miniaturized through volume reduction and a hologram display device having the same.

Recently, there has been a great demand for technologies to display and sense holographic images in free space in the fields of AR/VR, metaverse, and medicine (spot tracking and surgery). Holograms can be implemented in various ways, and among them, hovering hologram technology projects a display image based on a light source such as an LCD or LED onto a hologram sheet to display a holographic image at a symmetrical position with the same incident angle and distance. This hovering hologram technology can be combined with touch sensor technology to detect a touch position in free space, and implement a realistic hologram by applying a touch algorithm and a computational module. Therefore, it has great potential for application in the fields of AR/VR, metaverse, and medicine (spot tracking and surgery).

Conventional holographic display devices have a structural limitation in that they are bulky because the display device and the hologram sheet must maintain an angle of approximately 45 degrees in order to form a holographic image in free space.

The background technology of the present invention is disclosed in Korean Patent Publication No. 10-1237500 (registered on February 20, 2013, title of the invention: Stereoscopic image display system using a portable terminal).

The purpose of the present invention is to provide a holographic sheet capable of being miniaturized through volume reduction and a holographic display device having the same.

A hologram sheet according to the present invention comprises: a prism array that refracts light incident from the outside; and a reflection sheet that is arranged to face the prism array and reflects the light refracted by the prism array to generate a floating image in space.

Additionally, the prism array includes a plurality of micro prisms arranged along a first direction on one surface of the reflective sheet.

Additionally, a plurality of said micro prisms are arranged parallel to each other.

Additionally, the micro prism has a triangular cross-sectional shape.

Additionally, the reflective sheet generates the floating image in a space located on the opposite side of the prism array.

In addition, the reflective sheet includes a first reflective member having a first reflective surface; and a second reflective member having a second reflective surface arranged to face the first reflective member and arranged perpendicularly to the first reflective surface.

Additionally, light refracted by the prism array is incident on the first reflective member in a direction inclined with respect to the first reflective surface.

In addition, a hologram sheet according to the present invention includes: a prism array that refracts light incident from the outside; a reflective sheet that is arranged to face the prism array and reflects the light refracted by the prism array to generate a floating image in space; and a lens array that is arranged to face the reflective sheet and adjusts the position of the floating image generated by the reflective sheet.

In addition, the prism array includes a plurality of micro prisms arranged along a first direction on one surface of the reflective sheet, and the lens array includes a plurality of micro lenses arranged along a first direction on the other surface of the reflective sheet.

Additionally, a plurality of said micro lenses are arranged in at least two rows along the longitudinal direction of said micro prism.

Additionally, the micro lens has the shape of a concave lens.

Additionally, the plurality of said micro lenses have different curvatures.

Additionally, the curvature of the plurality of micro lenses increases or decreases along the first direction.

In addition, a holographic display device according to the present invention includes: a display; a hologram sheet having a prism array that refracts light incident from the display; and a reflection sheet that is arranged to face the prism array and reflects the light refracted from the prism array to generate a floating image in space; and a sensing member that detects a touch input to the floating image.

Additionally, the display is arranged parallel to the reflective sheet.

Additionally, the sensing member irradiates sensing light to the floating image in a direction parallel to the floating image.

In addition, the hologram sheet further includes a lens array that is arranged to face the reflective sheet and adjusts the position of the floating image generated by the reflective sheet.

Additionally, the prism array includes a plurality of micro prisms arranged along a first direction on one surface of the reflective sheet, and the lens array includes a plurality of micro lenses arranged along a first direction on one surface of the reflective sheet.

Additionally, the micro lens has a shape of a concave lens, and a plurality of the micro lenses have different curvatures.

In addition, the sensing member further includes a support member that is arranged to be inclined with respect to the first direction and supports the sensing member with respect to the hologram sheet.

The hologram sheet according to the present invention and the hologram display device having the same can have an overall volume reduced by arranging the display and the hologram sheet parallel to each other by a prism array.

In addition, the hologram sheet according to the present invention and the hologram display device having the same can position a floating image at a desired position without adjusting the distance between the display and the hologram sheet by the lens array.

In addition, since the hologram sheet according to the present invention and the hologram display device having the same have a plurality of micro lenses formed to have different curvatures, the sensor member can be placed in a position close to the hologram sheet, and the size of the support member for supporting the sensor member can be reduced.

FIG. 1 is a drawing schematically showing the configuration of a hologram display device according to a first embodiment of the present invention.
FIG. 2 is a side view schematically showing the configuration of a hologram sheet according to the first embodiment of the present invention.
FIG. 3 is a plan view schematically showing the configuration of a hologram sheet according to the first embodiment of the present invention.
FIG. 4 is a drawing schematically showing the configuration of a prism array according to the first embodiment of the present invention.
FIG. 5 is a drawing schematically showing the configuration of a reflective sheet according to the first embodiment of the present invention.
FIG. 6 is a drawing schematically showing the configuration of a hologram display device according to a second embodiment of the present invention.
Figure 7 is a side view schematically showing the configuration of a reflective sheet according to a second embodiment of the present invention.
Figure 8 is a plan view schematically showing the configuration of a reflective sheet according to a second embodiment of the present invention.
FIG. 9 is a drawing schematically showing the configuration of a lens array according to a second embodiment of the present invention.
FIG. 10 is a drawing schematically showing the configuration of a hologram display device according to a third embodiment of the present invention.
FIG. 11 is a drawing schematically showing the configuration of a lens array according to a third embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of a hologram sheet and a hologram display device having the same according to the present invention will be described.

In this process, the thickness of the lines depicted in the drawing and the size of the components may be exaggerated for the sake of clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of their functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definitions of these terms should be made based on the contents throughout this specification.

In addition, in this specification, when it is said that a part is "connected (or connected)" to another part, this includes not only cases where it is "directly connected (or connected)" but also cases where it is "indirectly connected (or connected)" with another member in between. In this specification, when it is said that a part "includes (or comprises)" a certain component, this does not mean that other components are excluded, unless specifically stated otherwise, but that it can "include (or comprise)" other components.

In addition, the same reference numerals throughout this specification may refer to the same components. Even if the same reference numerals or similar reference numerals are not mentioned or described in a specific drawing, they may be described based on other drawings. In addition, even if a part is not indicated by a reference numeral in a specific drawing, that part may be described based on other drawings. In addition, the number, shape, size, and relative difference in size of detailed components included in the drawings of this application are set for the convenience of understanding, and do not limit the embodiments and may be implemented in various forms.

FIG. 1 is a drawing schematically showing the configuration of a hologram display device according to a first embodiment of the present invention.

Referring to FIG. 1, a hologram display device according to the present embodiment may include a display (10), a hologram sheet (20), and a sensing member (30).

The display (10) outputs an image for generating a floating image (F). The display (10) according to the present embodiment may be formed to have a panel shape. The display (10) may be arranged parallel to a hologram sheet (20) described below. Accordingly, the display (10) may significantly reduce the overall volume of the hologram display device compared to the case where it is arranged at an angle to the hologram sheet (20).

The display (10) can output an image by converting an electromagnetic signal into an optical signal. More specifically, the display (10) can include a plurality of pixels that irradiate light toward a hologram sheet (20). The plurality of pixels can be arranged in a grid shape on one side of the display (10) facing the hologram sheet (20). An image output by the display (10) can be generated by a combination of light irradiated by the plurality of pixels. Each pixel can include a sub-pixel, such as an LED that irradiates RGB (Red, Green, Blue) light.

The hologram sheet (20) creates a floating image (F) in external space using light incident from the display (10).

FIG. 2 is a side view schematically showing the configuration of a hologram sheet according to the first embodiment of the present invention, and FIG. 3 is a plan view schematically showing the configuration of a hologram sheet according to the first embodiment of the present invention.

Referring to FIGS. 2 and 3, the hologram sheet (20) according to the present embodiment may include a prism array (100) and a reflective sheet (200).

The prism array (100) refracts light incident from the outside, for example, from the display (10). That is, the prism array (100) can function as a configuration that causes light transmitted from the display (10) to be incident at a predetermined angle with respect to the reflective sheet (200). Accordingly, the prism array (100) can induce the display (10) and the reflective sheet (200) to remain in a parallel state.

FIG. 4 is a drawing schematically showing the configuration of a prism array according to the first embodiment of the present invention.

Referring to FIG. 4, the prism array (100) according to the present embodiment may include a plurality of micro prisms (110).

The micro prism (110) can be exemplified by various types of prisms having a triangular cross-section. The angle, refractive index, etc. of the inclined surface of the micro prism (110) can be designed in various ways depending on the size of the display (10), the distance from the display (10), etc. The micro prism (110) can be arranged so that the inclined surface faces the display (10).

A plurality of micro prisms (110) may be arranged in a row along a first direction on one side (the left side based on FIG. 1) of a reflective sheet (200). The first direction may be exemplified as a direction parallel to the Z-axis based on FIGS. 1 to 4. However, the first direction is not limited thereto, and the design may be changed to any one of the directions parallel to the reflective sheet (200). The plurality of micro prisms (110) may be arranged so that their length directions are parallel to each other. The length directions of the micro prisms (110) may be arranged parallel to the Y-axis direction based on FIG. 4.

The reflective sheet (200) is positioned to face the prism array (100) and reflects light refracted by the prism array (100) to generate a floating image (F) in space. For example, the reflective sheet (200) can generate a floating image (F) in space located on the opposite side of the prism array (100).

FIG. 5 is a drawing schematically showing the configuration of a reflective sheet according to the first embodiment of the present invention.

Referring to FIG. 5, the reflective sheet (200) according to the present embodiment may include a first reflective member (210) and a second reflective member (220).

The first reflective member (210) forms one side of the outer surface of the reflective sheet (200) and is arranged to face the display (10). The first reflective member (210) may be formed to have a box shape of an approximately rectangular parallelepiped. The first reflective member (210) may be formed of a transparent material. The first reflective member (210) may be arranged such that one side (the left side based on FIG. 1) is parallel to the display (10). A plurality of micro prisms (110) may be fixed and supported on one side of the first reflective member (210) by an adhesive or the like. Light refracted by the micro prisms (110) may be incident on the first reflective member (210) at a predetermined angle with respect to one side of the first reflective member (210).

A first reflective surface (211) may be formed on the first reflective member (210). The first reflective surface (211) may be formed to have a shape of a partition wall that partitions the internal space of the first reflective member (210). The first reflective surface (211) may be formed by a method such as depositing aluminum or silver on one surface of a panel having a flat shape. A light absorption film (not shown) may be formed on the opposite surface of the first reflective surface (211). The light absorption film may be formed by depositing a matte black paint or the like on the opposite surface of the first reflective surface (211) or by adhering a black sheet.

The first reflection surface (211) may be formed in multiple pieces. The first reflection surfaces (211) may be arranged in a row along one direction inside the first reflection member (210). Light refracted by the prism array (100) may be incident on the first reflection member (210) in a direction inclined at a predetermined angle with respect to the first reflection surface (211). Here, the one direction in which the plurality of first reflection surfaces (211) are arranged may be variously designed and changed within a range in which light refracted by the prism array (100) may be inclinedly incident.

The second reflective member (220) forms the other side outer surface of the reflective sheet (200) and can be arranged to face the first reflective member (210). The second reflective member (220) can be formed to have the same rectangular box shape as the first reflective member (210). The second reflective member (220) can be formed of a transparent material. The second reflective member (220) can be fixed to one side of the other side of the first reflective member (210), that is, to the remaining side of both sides of the first reflective member (210) to which the prism array (100) is not fixed. That is, the first reflective member (210) and the second reflective member (220) can be laminated along the transmission direction of light incident from the display (10), more specifically, along the X-axis direction with reference to FIGS. 1 and 2.

A second reflective surface (221) may be formed on the second reflective member (220). The second reflective surface (221) may be formed to have a shape of a partition wall that partitions the internal space of the second reflective member (220). The second reflective surface (221) may be formed by a method such as depositing aluminum or silver on one side of a panel having a flat shape. A light absorption film (not shown) may be formed on the opposite side of the second reflective surface (221). The light absorption film may be formed by depositing a matte black paint or the like on the opposite side of the second reflective surface (221) or by adhering a black sheet. The second reflective surface (221) may be arranged perpendicularly to the first reflective surface (211).

The second reflective surface (221) may be formed in multiple pieces. The multiple second reflective surfaces (221) may be arranged in a single row along a direction perpendicular to the first reflective surface (211) within the second reflective member (22). The second reflective surface (221) re-reflects the light reflected by the first reflective surface (211) toward the external space of the second reflective member (220). Since the second reflective surface (221) is arranged perpendicular to the first reflective surface (211), light incident on the first reflective surface (211) at a set angle (θ) may be emitted from the second reflective surface (221) at the same angle.

Referring to FIGS. 1 to 5, the process of generating a floating image (F) by a reflective sheet (200) will be described in more detail. Light generated from a display (10) passes through a micro prism (110) and is incident on a first reflective surface (211), and the light incident on the first reflective surface (211) is reflected toward a second reflective surface (221).

Thereafter, the light reflected by the first reflective surface (211) is reflected from the second reflective surface (221) at an angle equal to the angle of incidence to the first reflective surface (211) and is projected onto a space located on the opposite side of the display (10) based on the reflective sheet (200).

Lights emitted at different angles from a point (A) of the display (10) can converge at a position spaced apart from the second reflective member (220) by a first set distance (d1) by the second reflective surface (221) to form a real image (R).

Through the above process, lights emitted from different points of the display (10) form real images at different locations. By combining these real images, a floating image (F) identical to the image output by the display (10) can be created in space.

Meanwhile, as illustrated in FIG. 1, since the display (10) is arranged parallel to the reflective sheet (200), and the distances traveled by the light emitted from different points of the display (10) to form a real image are all the same, the floating image (F) can be arranged parallel to the display (10) at a position spaced apart from the second reflective member (220) by a first set distance (d1).

The sensing member (30) detects a touch input to a floating image (F) generated by the hologram sheet (20). The sensing member (30) according to the present embodiment may be exemplified by a near-infrared sensor, a line laser sensor, or the like, which may include a light emitting unit that irradiates sensing light (D) toward the floating image (F), and a light receiving unit that receives sensing light (D) reflected from a user's finger when the user or the like touches the floating image (F), thereby detecting whether or not the user has touched the floating image (F) and its location. The sensing member (30) may irradiate the sensing light (D) to the floating image (F) in a direction parallel to the floating image (F). Accordingly, the sensing light (D) may pass through the floating image (F) in a direction parallel to the floating image (F).

Below, a hologram display device according to a second embodiment of the present invention will be described.

FIG. 6 is a drawing schematically showing the configuration of a hologram display device according to a second embodiment of the present invention, FIG. 7 is a side view schematically showing the configuration of a reflective sheet according to a second embodiment of the present invention, and FIG. 8 is a plan view schematically showing the configuration of a reflective sheet according to a second embodiment of the present invention.

Referring to FIGS. 6 to 8, a hologram display device according to the present embodiment may include a display (10), a hologram sheet (20), and a sensing member (30).

The hologram display device according to the present embodiment can be configured to differ only in the detailed configuration of the hologram sheet (20) compared to the hologram display device according to the first embodiment of the present invention. Accordingly, in the following description of the hologram display device according to the present embodiment, only the detailed configuration of the hologram sheet (20) that is different from the hologram display device according to the first embodiment of the present invention will be described. With respect to the remaining configurations of the display (10), the sensing member (30), and the hologram sheet (20) according to the present embodiment, the description of the display (10), the hologram sheet (20), and the sensing member (30) according to the first embodiment of the present invention can be applied as is.

The hologram sheet (20) according to the present embodiment may further include a lens array (300).

The lens array (300) is arranged to face the reflective sheet (200) and adjusts the position of the floating image (F) generated by the reflective sheet (200). More specifically, the lens array (300) can function as a configuration that increases the distance between the floating image (F) generated by the reflective sheet (200) and the reflective sheet (200) more than the first set distance (d1). Accordingly, the lens array (300) can prevent the volume of the hologram display device from increasing by positioning the floating image (F) at a relatively distant position without increasing the distance between the display (10) and the hologram sheet (20).

FIG. 9 is a drawing schematically showing the configuration of a lens array according to a second embodiment of the present invention.

Referring to FIGS. 6 to 9, the lens array (300) according to the present embodiment may include a micro lens (310).

The micro lens (310) may be formed to have a shape of a concave lens in which one side is concavely sunken into a hemispherical shape. The micro lens (310) may be arranged to face the prism array (100) with the reflective sheet (200) interposed therebetween. The micro lens (310) may be fixed to the other side of the reflective sheet (200), more specifically, to the other side (right side in FIG. 7) of the second reflective member (220) from which light reflected from the second reflective surface (221) is emitted. The micro lens (310) may be arranged so that the concave side faces the external space of the second reflective member (220).

The micro lens (310) may be provided in multiple numbers. The multiple micro lenses (310) may be arranged in a row along the first direction, that is, the direction parallel to the Z-axis based on FIG. 6, on the other surface of the reflective sheet (200) in the same manner as the micro prism (110). The number of micro lenses (310) arranged in the first direction may be the same as the number of micro prisms (110) arranged in the first direction, or may be different from the number of micro prisms (110). The multiple micro lenses (310) may be arranged in at least two rows along the longitudinal direction of the micro prism (110), that is, the Y-axis direction based on FIG. 9. The number of micro lenses (310) arranged in the longitudinal direction of the micro prism (110) may be designed to vary depending on the size of the micro lens (310), etc.

Below, the process of generating a floating image (F) by a hologram sheet (20) according to the present embodiment will be described.

Referring to FIGS. 6 to 9, light emitted at different angles from a point (A) of the display (10) passes through the reflective sheet (200) and then enters the micro lens (310) in a direction converging to the central axis of the micro lens (310).

As the micro lens (310) is formed to have the shape of a concave lens, the remaining light except for the light passing through the center line of the micro lens (310) is refracted in an outer direction of the center line of the micro lens (310).

By such refraction, the light passing through the micro lens (310) can converge at a second set distance (d2) located further than the first set distance (d1) and form a real image (R). That is, the real image (R) is generated at a further distance from the hologram sheet (20) compared to when there is no micro lens (310).

Lights emitted from different points of the display (10) by the same process form real images at different locations. By combining these real images, a floating image (F) identical to the image output by the display (10) can be created in space.

Meanwhile, as illustrated in FIG. 6, since the display (10) is arranged parallel to the reflective sheet (200), and the distances traveled by the light emitted from different points of the display (10) to form a real image are all the same, the floating image (F) can be arranged parallel to the display (10) at a position spaced apart from the second reflective member (220) by a second set distance (d2).

Below, the configuration of a hologram display device according to a third embodiment of the present invention will be described.

FIG. 10 is a drawing schematically showing the configuration of a hologram display device according to a third embodiment of the present invention, and FIG. 11 is a drawing schematically showing the configuration of a lens array according to the third embodiment of the present invention.

Referring to FIGS. 10 and 11, a hologram display device according to the present embodiment may include a display (10), a hologram sheet (20), a sensing member (30), and a support member (40).

The hologram display device according to the present embodiment may be configured to have a different detailed configuration of the lens array (300) and to further include a support member (40) compared to the hologram display device according to the second embodiment of the present invention. Accordingly, in the following description of the hologram display device according to the present embodiment, only the detailed configuration of the lens array (300) and the support member (40), which are different from those of the hologram display device according to the second embodiment of the present invention, will be described. With respect to the remaining configurations of the display (10), the sensing member (30), and the hologram sheet (20) according to the present embodiment, the description of the display (10), the hologram sheet (20), and the sensing member (30) according to the second embodiment of the present invention may be applied as is.

A plurality of micro lenses (310) constituting the lens array (300) according to the present embodiment may be formed to have different curvatures. More specifically, the curvatures of the plurality of micro lenses (310) may be formed to gradually increase or decrease along the first direction.

For example, as illustrated in FIGS. 10 and 11, among the plurality of micro lenses (310), the curvature of the micro lens (310) positioned at the top along the first direction may be formed as a first set curvature (r1). In addition, among the plurality of micro lenses (310), the curvature of the micro lens (310) positioned at the bottom along the first direction may be formed as a second set curvature (r2) greater than the first set curvature (r1). The curvatures of the remaining micro lenses (310) positioned between the micro lens (310) positioned at the top and the micro lens (310) positioned at the bottom may gradually increase downward within the range of the first set curvature (r1) and the second set curvature (r2).

The curvature of the plurality of micro lenses (310) is not limited to the above-described matters, and may be formed to gradually decrease as it goes downward. In this case, the first set curvature (r1) may be formed to be larger than the second set curvature (r2).

Light passing through different micro lenses (310) along the first direction generates real images at positions spaced apart from the reflective sheet (200) by different distances, and the floating image (F) can be placed at an angle with respect to the display (10) as illustrated in FIG. 10.

Accordingly, the detection member (30) can be positioned closer to the hologram sheet (20) than when multiple micro lenses (310) have the same curvature, and the size of the support member (40) described below can be reduced.

The support member (40) supports the sensing member (30) with respect to the hologram sheet (20). The support member (40) according to the present embodiment may be exemplified by various types of supporting means, such as a bracket or frame, which extends from the hologram sheet (20) and is coupled with the sensing member (30). The support member (40) may be detachably connected to the hologram sheet (20). Accordingly, the connection position of the support member (40) with respect to the hologram sheet (20) may be freely changed in response to a change in the position of the sensing member (30).

Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Therefore, the true technical protection scope of the present invention should be defined by the patent claims below.

10: Display 20: Hologram Sheet
30: Detection member 40: Support member
100 : Prism Array 110 : Micro Prism
200 : Reflective sheet 210 : 1st reflective member
211: First reflective surface 220: Second reflective member
221: Second reflective surface 300: Lens array
310 : Micro Lens

Claims (20)

A prism array that refracts light incident from outside; and
A hologram sheet characterized by including a reflection sheet arranged to face the prism array and reflecting light refracted by the prism array to generate a floating image in space.
In the first paragraph,
A hologram sheet, characterized in that the prism array includes a plurality of micro prisms arranged along a first direction on one surface of the reflective sheet.
In the second paragraph,
A holographic sheet characterized in that a plurality of said micro prisms are arranged parallel to each other.
In the second paragraph,
A holographic sheet characterized in that the above micro prism has a triangular cross-sectional shape.
In the first paragraph,
A holographic sheet characterized in that the above reflective sheet generates the floating image in a space located on the opposite side of the prism array.
In paragraph 5,
The above reflective sheet,
A first reflective member having a first reflective surface; and
A hologram sheet characterized by including a second reflective member having a second reflective surface arranged to face the first reflective member and arranged perpendicularly to the first reflective surface.
In Article 6,
A hologram sheet, characterized in that light refracted by the prism array is incident on the first reflective member in a direction inclined with respect to the first reflective surface.
A prism array that refracts light incident from outside;
A reflective sheet arranged to face the prism array and reflecting light refracted by the prism array to create a floating image in space; and
A hologram sheet characterized by including a lens array arranged to face the reflective sheet and adjust the position of the floating image generated by the reflective sheet.
In Article 8,
The above prism array includes a plurality of micro prisms arranged along a first direction on one surface of the reflective sheet,
A hologram sheet, characterized in that the lens array includes a plurality of micro lenses arranged along a first direction on the other surface of the reflective sheet.
In Article 9,
A holographic sheet, characterized in that a plurality of said micro lenses are arranged in at least two rows along the longitudinal direction of said micro prism.
In Article 9,
A holographic sheet characterized in that the above micro lens has the shape of a concave lens.
In Article 11,
A holographic sheet characterized in that a plurality of said micro lenses have different curvatures.
In Article 12,
A holographic sheet, characterized in that the curvature of a plurality of said micro lenses increases or decreases along the first direction.
display;
A hologram sheet having a prism array that refracts light incident from the display, and a reflection sheet that is positioned facing the prism array and reflects light refracted from the prism array to create a floating image in space; and
A holographic display device, characterized by including a sensing member for detecting a touch input to the floating image.
In Article 14,
A holographic display device, characterized in that the display is arranged parallel to the reflective sheet.
In Article 14,
A holographic display device, characterized in that the above detection member irradiates detection light to the floating image in a direction parallel to the floating image.
In Article 14,
A holographic display device characterized in that the holographic sheet further includes a lens array that is arranged to face the reflective sheet and adjusts the position of the floating image generated by the reflective sheet.
In Article 17,
The above prism array includes a plurality of micro prisms arranged along a first direction on one surface of the reflective sheet,
A holographic display device, characterized in that the lens array includes a plurality of micro lenses arranged along a first direction on one surface of the reflective sheet.
In Article 18,
A holographic display device, wherein the micro lens has a concave lens shape and a plurality of the micro lenses have different curvatures.
In Article 19,
The above detection member is arranged at an angle with respect to the first direction,
A hologram display device characterized by further comprising a support member for supporting the sensing member on the hologram sheet.

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