KR102139746B1 - Transparent display apparatus and method thereof - Google Patents

Abstract

A transparent display device is disclosed. The transparent display device includes a plurality of pixels, and is disposed on a rear surface of a transparent display panel unit and an image panel unit that displays an image frame in which images of different viewpoints are arranged in a predetermined arrangement pattern, and at least of light provided from the outside. A transparent light guide unit that partially transmits and at least partially reflects, and the transparent light guide unit operates such that reflected light is refracted in a predetermined direction so that images of different viewpoints are provided in different viewing areas.

Description

Transparent display device and its display method {TRANSPARENT DISPLAY APPARATUS AND METHOD THEREOF}

The present invention relates to a transparent display device and a display method, and more particularly, to a transparent display device and a display method for providing a 3D image.

With the development of electronic technology, various types of display devices are used in various fields. In particular, research discussions on next-generation display devices, such as transparent display devices, have recently been accelerated.

The transparent display device means a display device having a transparent property and the background behind the device is intact. Conventionally, a display panel was manufactured using an opaque semiconductor compound such as silicon (Si), gallium arsenide (GaAs), etc. However, there is a need for various display services that cannot be realized using an existing display panel, and thus meets these demands. Efforts have been made to develop new types of electronic devices. One of the things developed under these efforts is a transparent display device.

The transparent display device is implemented in a form including a transparent oxide semiconductor film, and has transparent properties. In the case of using a transparent display device, a user can view necessary background information through a transparent display device screen while looking at a rear background located behind the device. Therefore, the spatial and temporal constraints of the existing display devices can be eliminated.

Since the transparent display device displays various types of information through a display unit having a transparent property, the appearance of the real object reflected on the back and the displayed information are in harmony.

Meanwhile, in order to provide a 3D image in such a transparent display device, a projection optical system has been conventionally used, but there is a problem in that the system is bulky and the transmittance of objects and images is low.

The present invention is in accordance with the above-mentioned needs, and an object of the present invention is to provide a transparent display device and a display method capable of providing a 3D image using a reflective selective integrated image device.

A transparent display device according to an exemplary embodiment of the present invention for achieving the above object includes a plurality of pixels, and a transparent display panel unit for displaying an image frame in which images of different viewpoints are arranged in a predetermined arrangement pattern And a transparent light guide unit disposed on the rear surface of the image panel unit to transmit at least a portion of light provided from the outside and at least partially reflect the transparent light guide unit, wherein the reflected light is refracted in a predetermined direction. It operates so that images of different viewpoints are provided in different viewing areas.

In this case, the transparent light guide unit may include a plurality of concave half mirrors or a plurality of convex half mirrors arranged in a two-dimensional shape.

In this case, the transparent light guide unit may be a reflective selective integrated image device in a form in which the semi-mirror array is inserted in a plate made of a transparent material that transmits light.

In addition, the plurality of concave half mirrors or the plurality of convex half mirrors included in the half mirror array may have different apertures and focal lengths, respectively.

In addition, a polarization part positioned between the transparent display panel part and the light guide part to transmit light in a specific polarization direction may be further included.

In addition, in the semi-mirror array, a metal thin film is formed on one side, and light transmittance and reflectance may vary according to the thickness of the metal thin film.

On the other hand, the display system according to an embodiment of the present invention includes a light source device for providing light and a plurality of pixels, and a transparent display panel unit for displaying an image frame in which images of different viewpoints are arranged in a predetermined arrangement pattern. And a transparent display device disposed on a rear surface of the image panel unit to transmit at least a portion of light provided to the light source device and reflect at least a portion of the light, wherein the transparent light guide unit includes the reflected light. The image is refracted in the predetermined direction to operate so that images from different viewpoints are provided in different viewing areas.

In this case, the transparent light guide unit may include a plurality of concave half mirrors or a plurality of convex half mirrors arranged in a two-dimensional shape.

In this case, the transparent light guide unit may be a reflective selective integrated image device in a form in which the semi-mirror array is inserted in a plate made of a transparent material that transmits light.

In addition, the plurality of concave half mirrors or the plurality of convex half mirrors included in the half mirror array may have different apertures and focal lengths, respectively.

In addition, in the semi-mirror array, a metal thin film is formed on one side, and light transmittance and reflectance may vary according to the thickness of the metal thin film.

In addition, the light source device includes a light source unit providing the light and a first polarization unit positioned on the front surface of the light source unit to transmit light in a first polarization direction, and the transparent display device includes the transparent display panel unit and the A second polarization unit positioned between the light guide units and transmitting light in a second polarization direction different from the first polarization direction may be further included.

According to various embodiments of the present invention as described above, the transparent display device may provide a 3D image having object transmittance and image transmittance desired by a user by using a reflective selective integrated image device.

1 is a block diagram showing the configuration of a transparent display device according to an embodiment of the present invention.
2 is a view for explaining the operation of the transparent display device according to an embodiment of the present invention.
3A and 3B are diagrams for explaining a method for forming a viewing area according to an embodiment of the present invention.
4A and 4B are views showing the structure of a light guide unit according to an embodiment of the present invention.
5A and 5B are diagrams for describing an operation of a polarizing plate according to an embodiment of the present invention.
6 is a view showing the configuration of a display system according to an embodiment of the present invention.
7 and 8 are diagrams for explaining object transmission and image reproduction efficiency of a transparent display device according to an exemplary embodiment of the present invention.
9 is a view showing a relationship between object transmittance and image reproduction efficiency according to reflectivity of a reflective selective integrated image device according to an embodiment of the present invention.

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

1 is a block diagram showing the configuration of a transparent display device according to an embodiment of the present invention.

The transparent display device 100 of FIG. 1 may be implemented as various types of display devices such as TVs, monitors, mobile phones, PDAs, PCs, set-top PCs, tablet PCs, electronic picture frames, kiosks, and the like.

According to FIG. 1, the transparent display device 100 includes a transparent display panel unit 110 and a transparent light guide unit 120.

The transparent display panel 110 is configured to change and transmit various electrical information as visual information by using a change in liquid crystal transmittance according to an applied voltage, and a color and a lower panel in which a transparent thin film (TFT) transistor and a pixel electrode are arranged. It can be composed of a liquid crystal filled between the two glass substrates, and a top plate composed of a color filter and a transparent common electrode for indicating. In addition, polarizing plates for linearly polarizing visible light (natural light) are attached to both surfaces of the two glass substrates. A capacitor and an auxiliary capacitor are formed due to the liquid crystal between the upper and lower electrodes to express image information.

The transparent thin film transistor (not shown) refers to a transistor manufactured by replacing the opaque silicon of the existing thin film transistor with a transparent material such as transparent zinc oxide or titanium oxide, and forms a layer of the transparent display panel 110. Sources, gates, and drains may be provided in the transparent thin film transistor layer (not shown), and a plurality of transparent transistors evenly distributed over the entire area of the display surface may be provided.

Each of the transparent electrodes (not shown) includes a plurality of line electrodes, and alignment directions of the line electrodes are formed perpendicular to each other. For example, if the line electrodes of the first transparent electrode are arranged in the horizontal direction, the line electrodes of the second transparent electrode are arranged in the vertical direction. Accordingly, a plurality of crossing regions are formed between the first transparent electrode and the second transparent electrode. A transparent thin film transistor is connected to each crossing region.

Indium tin oxide (ITO) may be used as the transparent electrode. Alternatively, new materials such as graphene may be used. Graphene refers to a material having transparent properties with a carbon atom connected to each other to form a honeycomb plane.

When a voltage is applied to the gate of the transparent TFT constituting the pixel to turn the transistor into a turn-on state, an image voltage is input to the liquid crystal. And when the image voltage is applied to store the image information in the liquid crystal and the transistor is turned off, the charge stored in the liquid crystal charger and the auxiliary charger displays the image image for a certain period of time. When a voltage is applied to the liquid crystal, the arrangement of the liquid crystal changes. When light passes through the liquid crystal in this state, diffraction occurs, and the light is transmitted through the polarizing plate to obtain a desired image.

The transparent display panel unit 110 includes a plurality of pixels composed of a plurality of sub-pixels. Here, the sub-pixel may be composed of R (Red), G (Green), and B (Blue). That is, pixels composed of R, G, and B sub-pixels may be arranged in a plurality of row and column directions to form the transparent display panel 110.

Then, the transparent display panel unit 110 displays an image frame. Specifically, the image panel unit 111 displays an image frame in which a multi-view image is arranged in a predetermined arrangement pattern.

When the light provided from the outside is incident on each pixel of the transparent display panel 110, the transparent display panel 110 controls the transmittance of light incident on each pixel according to an image signal to display an image frame. Specifically, the transparent display panel unit 110 includes a liquid crystal layer and two electrodes formed on both surfaces of the liquid crystal layer. When a voltage is applied to both electrodes, an electric field is generated, and the light transmittance is adjusted by moving molecules in the liquid crystal layer between the two electrodes.

Alternatively, the transparent display panel unit 110 may be embodied as an OLED panel including a self-luminous element. Specifically, a plurality of pixels are arranged in the image panel unit 110, and each pixel is supplied to a self-emitting device that emits light in response to a current flow, ELVDD that supplies current to the self-emitting device, and a self-emitting device. And a driving transistor for controlling the current. Here, the self-luminous element may be an organic light-emitting diode. Meanwhile, each of the plurality of pixels may include RGB pixels, and each of the RGB pixels may emit light simultaneously or sequentially.

The transparent light guide unit 120 is disposed on the rear surface of the transparent display panel unit 110. In this case, the transparent light guide unit 120 may be implemented as a reflective selective integrated image device. The reflective selective integrated image device has a plate shape made of a transparent medium as a whole, and a plurality of half mirrors are inserted in the form of a two-dimensional array. The semi-mirrors may be formed in a two-dimensional array form in which a plurality of X- and Y-axes are arranged. In this case, the semi-mirrors may be made of concave mirrors or convex mirrors, and each concave mirror or convex mirror generally has the same aperture and focal length. However, each concave mirror or convex mirror may have a different aperture and focal length in order to correct light incident on the side in order to secure better performance.

The transparent light guide unit 120 may transmit at least a portion of light provided from the outside and reflect at least a portion. The transmittance and reflectance of the transparent light guide unit 120 may be determined by the thickness of the metal thin film, and details of the transmittance and reflectance of the specific transparent light guide unit 120 will be described below with reference to FIG. 4.

In addition, the transparent light guide unit 120 may operate such that reflected light is refracted in a predetermined direction so that images of different viewpoints are provided in different viewing areas. Specifically, the transparent light guide unit 120 refracts images of different viewpoints displayed on the transparent display panel unit 110 at different angles, and is positioned at a predetermined distance, such as a viewing distance (for example, about 3m). Provides a focused image. The position where the image is formed is called a viewing area (or optical view). Accordingly, when one eye of the user is located in one first viewing area and the other eye is located in the second viewing area, a three-dimensional effect can be felt.

Meanwhile, although only the transparent display panel 110 and the transparent light guide 120 are illustrated in FIG. 1, other components for performing a display function in the transparent display device 100 may be further included. For example, an image receiving unit that receives image and image depth information from various external devices such as an external storage medium, a broadcasting station, a web server, and a rendering that renders a multiview image based on the received image and image depth information It may further include a wealth.

Specifically, the image receiving unit (not shown) may receive images from various external devices such as an external storage medium, a broadcasting station, and a web server. Here, the input image is one of a single view image, a stereo image, and a multi-view image. The single-view image is an image captured by a general imaging device, and a stereoscopic image is a 3D video image expressed only by a left-eye image and a right-eye image, and is a stereoscopic image captured by a stereo imaging apparatus. In general, a stereo imaging apparatus is a photographing apparatus having two lenses and is used to photograph a stereoscopic image. In addition, a multiview image refers to a 3D video image that geometrically corrects images photographed through one or more photographing devices and provides various viewpoints in various directions to a user through spatial synthesis.

Also, the image receiving unit (not shown) may receive depth information of the image. In general, the depth of an image is a depth value assigned to each pixel of the image. For example, an 8-bit depth may have a grayscale value of 0 to 255. For example, when representing black/white as a reference, black (low value) may indicate a distance from the viewer, and white (high value) may indicate a location near the viewer.

When a 2D image is input, the rendering unit (not shown) may render a multi-view image based on depth information extracted by 2D/3D conversion. Alternatively, the rendering unit (not shown) renders a multi-view image based on at least one view and depth information of the multi-view, that is, the N views and the depth information when N views and corresponding N depth information are input. can do. Alternatively, when only N views are input, the rendering unit (not shown) may extract depth information from the N views and render a multi-view image based on the extracted depth information.

For example, the rendering unit (not shown) may select one of a 3D image, that is, a left-eye image and a right-eye image as a reference view (or a center view) to generate a leftmost view and a rightmost view, which are the basis of a multiview image. have. In this case, the rendering unit (not shown) may generate the leftmost view and the rightmost view based on the corrected depth information corresponding to one of the left-eye image and the right-eye image selected as the reference view. The rendering unit (not shown) generates a plurality of interpolation views between the center view and the leftmost view when the left and right views are generated, and generates a plurality of interpolation views between the center view and the rightmost view. You can render a point image. However, it is not limited to this, and it is also possible to generate an extrapolation view generated by the extrapolation technique. On the other hand, when rendering a multi-view image based on the 2D image and depth information, it goes without saying that the 2D image can be selected as the center view.

2 is a view for explaining the operation of the transparent display device according to an embodiment of the present invention.

When light is provided from the outside (or the light source unit 130) to the transparent light guide unit 120, the transparent light guide unit 120 transmits at least a portion of light and reflects at least a portion of the light, and the reflected light is a transparent display panel unit It transmits through (110) to provide an image to the user. Here, the transparent display panel unit 110 may include a plurality of pixels, and display an image frame in which images of different viewpoints are arranged in a predetermined arrangement pattern.

The transparent light guide unit 120 refracts the reflected light in a predetermined direction, so that images of different viewpoints displayed on the image frames of the transparent display panel unit 110 are provided in different viewing areas, so that the user does not wear glasses. 3D images can be provided. The specific operation in which the multi-view image is provided in different viewing areas to provide the autostereoscopic 3D image will be described in detail with reference to FIG. 3 below.

3A and 3B are diagrams for explaining a method for forming a viewing area according to an embodiment of the present invention.

Referring to FIG. 3A, light provided from the light source unit 130 is reflected by the transparent light guide unit 120 and refracted in a predetermined direction to be projected to a specific area. In this case, by adjusting the refraction direction of light, images of different viewpoints displayed on the image frame of the transparent display panel 110 may be provided in different viewing areas to provide autostereoscopic 3D images.

FIG. 3B is a view illustrating only a part of light passing through a specific pixel column of the transparent display panel unit 110 in order to describe a specific viewing area forming method according to an embodiment of the present invention. Referring to FIG. 3B, the transparent display panel unit 110 includes a plurality of pixels divided into a plurality of columns. Images of different viewpoints may be arranged for each column. For example, as illustrated in FIG. 3, a plurality of images 1, 2, 3, 4, 5, 6, 7 of different viewpoints may be repeatedly arranged in sequence. That is, each pixel column may be arranged in groups numbered 1, 2, 3, 4, 5, 6, 7. The graphic signal applied to the panel may be arranged such that pixel column 1 displays the first image and pixel column 2 displays the second image.

The transparent light guide unit 120 provides light to the transparent display panel unit 110. In this case, the transparent light guide unit 120 refracts light in a predetermined direction to average each binocular image 1, 2, 3, 4, 5, 6, 7 formed on the transparent display panel unit 110 at a viewing distance. The first optical view to the seventh optical view may be provided to have a distance of 65 mm, which is a central distance. That is, as illustrated in FIG. 3, when the first to seventh optical views are formed and the user's left and right eyes are positioned in adjacent optical views, the 3D image can be viewed.

4A and 4B are views showing the structure of a light guide unit according to an embodiment of the present invention.

4A, the transparent light guide unit 120 may transmit light. That is, the light reflected from the object may pass through the transparent light guide unit 120 as it is and reach the opposite side of the object. Accordingly, a user located at the front of the transparent light guide unit 120 can see an object located at the rear of the transparent light guide unit 120.

In addition, the transparent light guide unit 120 may reflect light. That is, light from the outside is reflected on the transparent light guide unit 120 to reach the user. In this case, an autostereoscopic 3D image may be provided to a user using a projector or a transparent display panel. Specifically, according to an embodiment of the present invention, light from the outside is reflected by the transparent light guide unit 120 and refracted in a predetermined direction, so images of different viewpoints displayed on the transparent display panel unit 110 are displayed. It is possible to provide the autostereo 3D image to the user by being provided in different viewing areas. That is, since the transparent light guide unit 120 has a property of transmitting light and a property of reflecting light at the same time, a user can simultaneously view objects and images on opposite sides.

4B, the transparent light guide unit 120 may be a reflective selective integrated image device. The reflective selective integrated image device has a plate shape made of a transparent medium as a whole, and a plurality of half mirrors are inserted in the form of a two-dimensional array. That is, a plurality of semi-mirrors are formed in the form of a two-dimensional array in which a plurality of half mirrors are arranged on the X and Y axes. Here, the semi-mirror may consist of a convex mirror or a concave mirror, and each convex mirror or concave mirror generally has the same aperture and focal length. However, each convex mirror or concave mirror may have a different aperture and focal length in order to correct light incident on the side in order to secure better performance. Hereinafter, for convenience of explanation, a concave mirror will be described as an example, but may be implemented as a convex mirror. In addition, although the half mirror array is exemplified that the half mirrors are formed in a two-dimensional array form, the array form is not limited thereto.

The transparent light guide unit 120 transmits at least a portion of the incident light and reflects at least a portion. That is, at least a part of the incident light is transmitted and at least a part is reflected due to the semi-mirror property of the half mirror array inserted in the transparent light guide unit 120. When the thickness of the half mirrors constituting the half mirror array is very thin below a predetermined value, light can be transmitted by the tunneling effect, and does not affect the refractive index characteristics of light, so the transmitted light has no effect except the decrease in brightness. It does not.

Meanwhile, the reflective selective integrated image device may be manufactured by forming a metal thin film on a half mirror array in which a plurality of convex half mirrors or a plurality of concave half mirrors are arranged in a two-dimensional shape. In general, light does not transmit metal, but when the metal is very thin (several nm or less), light can be transmitted by the tunneling effect in quantum mechanics. That is, by adjusting the thickness of the metal thin film formed on the semi-mirror array, it is possible to manufacture a reflective selective integrated image device that transmits at least a portion of light and reflects at least a portion of light.

At this time, the thickness of the metal thin film determines the transmittance and reflectance of the reflective selective integrated image device. As the thickness of the metal thin film increases, the reflectivity of the reflective selective integrated image device increases and the transmittance decreases. Conversely, as the thickness of the metal thin film decreases, the reflectivity of the reflective selective integrated image device decreases and the transmittance increases. For example, light incident on the semi-mirror array is reflected by the metal thin film, and the transmittance varies depending on the thickness of the metal thin film.

5A and 5B are diagrams for describing an operation of a polarizing plate according to an embodiment of the present invention.

Referring to FIG. 5A, a polarization unit 150 that transmits light in a specific polarization direction may be positioned between the transparent display panel unit 110 and the transparent light guide unit 120. The polarization unit 150 selectively passes light in a specific direction among light refracted by the transparent display panel 110 to display an image to the user.

Referring to FIG. 5B, in the light source device 200, a first polarization unit 140 that transmits light in a first polarization direction is located on the front surface of the light source unit 130, and the transparent display panel unit ( 110) and a second polarization unit 150 that transmits light in a second polarization direction different from the first polarization direction may be positioned between the light guide unit 120.

Specifically, the light having the first polarization direction is provided to the transparent display device 100 by the first polarization unit 140, and the second polarization unit 150 is refracted while passing through the transparent display panel unit 110. Only light having a second polarization direction among light can be selectively passed to provide an image to the user. Here, the first polarization direction and the second polarization direction may be different.

6 is a view showing the configuration of a display system according to an embodiment of the present invention.

Referring to FIG. 6, the display system 1000 includes a transparent display device 100 and a light source device 200.

The light provided from the light source unit 130 of the light source device 200 is reflected by the transparent light guide unit 120 of the transparent display device 100 and refracted in a predetermined direction, so images of different views of the transparent display panel unit 110 To provide different viewing areas. Accordingly, the user is positioned at the viewing distance of the display system 1000 to watch the autostereoscopic 3D image.

In addition, the transparent display device 100 transmits an object on the back of the transparent display device 100 so that the user can simultaneously view the object on the back of the transparent display device 100 along with the 3D image. In this case, the transmittance and reflectance of the transparent light guide unit 120 may be adjusted to determine an object's transmittance and image reproduction efficiency. For example, if the transmittance of the transparent light guide unit 120 is increased and the reflectivity is lowered, the user may see objects more clearly and the image may be blurred. The image can be seen more clearly, and the object can appear blurry. That is, according to an embodiment of the present invention, it is possible to adjust the transmittance of an object and the image reproduction efficiency according to a situation in which a transparent display device is used.

7 and 8 are diagrams for explaining object transmission and image reproduction efficiency of a transparent display device according to an exemplary embodiment of the present invention.

For example, when the transparent light guide unit 120 is implemented to have 70% transmittance (or 30% reflectivity), the light reflected from the object in the transparent display device 100 having the structure as shown in FIG. 7 is transparent light The guide portion 120 passes through at a transmittance of 70%.

In general, since the polarization unit 150 has a transmittance of 50%, when the transparent light guide unit 120 and the polarization unit 150 are continuously passed, 35% of the total light reflected from the object is polarized light ( 150).

In addition, in general, since the transparent display panel unit 110 has a transmittance of 20%, when the transparent light guide unit 120, the polarization unit 150, and the transparent display panel unit 110 are successively passed, the object is eventually 7% of the total light reflected from the light reaches the user.

In addition, when the transparent light guide unit 120 is implemented to have 70% transmittance (or 30% reflectivity), as shown in FIG. 8, the light provided from the light source unit 130 of the light source device 200 is a light source unit 140 ) Is passed through the first polarization unit 130 located on the front surface with a transmittance of 50%.

In general, since the transparent display panel unit 110 has a transmittance of 20%, when the first polarization unit 140 and the transparent display panel unit 110 are continuously passed, 10 of the total light provided from the light source unit 130 % Light passes through the transparent display panel 110.

Since the second polarization unit 150 of the transparent display device 100 has a different polarization direction from the first polarization unit 140 of the light source device 200, the first polarization unit 140 and the transparent display panel unit 110 ), 50% of the light passing through the second polarization unit 150. That is, 5% of the total light provided from the light source unit 130 passes through the second polarization unit 150.

Since the transparent light guide unit 120 has a transmittance of 70%, 30% of light provided to the transparent light guide unit 120 is reflected. Accordingly, light provided from the light source unit 130 passes through the first polarization unit 140, the transparent display panel unit 110, and the second polarization unit 150 continuously and the light reflected from the transparent light guide unit 120 is , 1.5% of the total light provided by the light source unit 130.

Since the light reflected from the transparent light guide unit 120 is light in the second polarization direction, 100% of light passes through the second polarization unit 150 again.

Since the light passing through the second polarization unit 150 passes through the transparent display panel 110 again with a transmittance of 20%, only 0.3% of the total light provided from the light source unit reaches the user.

That is, when the transparent light guide unit 120 is implemented to have a transmittance of 70% (or a reflectivity of 30%), the transmittance of the object may be 7% and the image reproduction efficiency may be 0.3%.

In general, a user watching a transparent 3D image can naturally enjoy the most object and image when the transmittance of the object is 7% and the image reproduction efficiency is 0.3%, and the transmittance of the transparent light guide unit 120 is adjusted. By doing so, it is possible to implement a transparent display device 100 capable of viewing natural 3D images.

In another embodiment, when the transparent light guide unit 120 is implemented to have a transmittance of 30%, the transmittance of the object may be 3% and the image reproduction efficiency may be 0.7%. In this case, the image can be viewed more clearly than when the object transmittance is 7% and the image reproduction efficiency is 0.3%.

According to various embodiments of the present invention as described above, the transparent display device may adjust the transmittance (or reflectivity) of the transparent light guide unit 120 to control object transmittance and image reproduction efficiency, and provide aesthetic stability to the user. It can create a transparent 3D image giving.

9 is a view showing a relationship between object transmittance and image reproduction efficiency according to reflectivity of a reflective selective integrated image device according to an embodiment of the present invention.

Referring to FIG. 9, it can be seen that, in the case of a parallax barrier, the transmittance of an object and the reproduction efficiency of an image are constant, whereas in the case of a reflective selective integrated image device, the lower the object transmission, the higher the image reproduction efficiency. Conversely, when the object transmittance increases, the image reproduction efficiency decreases.

That is, unlike the parallax barrier, the transparent display device 100 according to an embodiment of the present invention adjusts the transmittance and reflectance of the transparent light guide unit 120 to control the object transmittance and image reproduction efficiency of the transparent display device 100 Can decide. That is, according to an embodiment of the present invention, it is possible to adjust the transmittance and image reproduction efficiency of an object of the transparent display device 100 according to a situation in which the transparent display device 100 is used.

In the above, although the preferred embodiment of the present invention has been illustrated and described, the present invention is not limited to the above-described specific embodiment, and is generally limited in the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. It is of course possible to perform various modifications by a person having knowledge of, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

100: transparent display device 110: transparent display panel unit
120: transparent light guide unit 130: light source unit
140: first polarization unit 150: second polarization unit
1000: display system

Claims (12)

A transparent display panel unit including a plurality of pixels and displaying image frames in which images of different viewpoints are arranged in a predetermined arrangement pattern; And
It is disposed on the rear surface of the transparent display panel portion, at least a portion of the light provided from the outside transmits at least a portion of the transparent light guide portion to reflect; includes,
The transparent light guide unit,
It includes a plurality of half mirrors, and the light reflected by the plurality of half mirrors is refracted in a predetermined direction to operate such that images of different viewpoints are provided in different viewing areas,
A transparent display device, wherein one of the plurality of half mirrors has a different aperture and focal length from the other half mirror. According to claim 1,
Each of the plurality of half mirrors,
One of concave half mirror and convex half mirror,
The plurality of half mirrors, a transparent display device, characterized in that arranged in a two-dimensional form. According to claim 2,
The transparent light guide unit,
A transparent display device, characterized in that the plurality of semi-mirrors are reflective selective integrated image elements formed in a form inserted in a plate made of a transparent material that transmits light. According to claim 2,
Each of the plurality of half mirrors, a transparent display device, characterized in that having a different aperture and focal length. According to claim 1,
A transparent display device further comprising a polarization unit positioned between the transparent display panel unit and the transparent light guide unit to transmit light in a specific polarization direction. According to claim 2,
Each of the plurality of half mirrors, a metal thin film is formed on one side, the transparent display device characterized in that the transmittance and reflectance of light varies depending on the thickness of the metal thin film. A light source device that provides light; And
A transparent display panel unit that includes a plurality of pixels and displays an image frame in which images of different viewpoints are arranged in a predetermined arrangement pattern, and at least a part of light provided to the light source device is disposed on the rear surface of the transparent display panel unit. It includes; a transparent display device including a transparent light guide portion that transmits and at least partially reflects,
The transparent light guide unit,
It includes a plurality of half mirrors, and the light reflected by the plurality of half mirrors is refracted in a predetermined direction to operate such that images of different viewpoints are provided in different viewing areas,
One of the plurality of half mirrors, a display system characterized in that the aperture and focal length are different from the other half mirrors. The method of claim 7,
Each of the plurality of half mirrors,
One of concave half mirror and convex half mirror,
The plurality of half mirrors, the display system, characterized in that arranged in a two-dimensional form. The method of claim 8,
The transparent light guide unit,
A display system characterized in that the plurality of semi-mirrors are reflective selective integrated image elements formed in a form inserted in a plate made of a transparent material that transmits light. The method of claim 8,
Each of the plurality of half mirrors, the display system, characterized in that having a different aperture and focal length. The method of claim 8,
Each of the plurality of half mirrors, a metal thin film is formed on one side, the display system characterized in that the transmittance and reflectance of light varies depending on the thickness of the metal thin film. The method of claim 7,
The light source device,
It includes; a light source unit providing the light and a first polarization unit positioned on the front surface of the light source unit to transmit light in a first polarization direction;
The transparent display device further comprises a second polarization unit positioned between the transparent display panel unit and the transparent light guide unit to transmit light in a second polarization direction different from the first polarization direction; system.

Images