Transparent display apparatus

Abstract

This transparent display apparatus comprises: a plurality of transparent display modules arranged in a M*N matrix; a filler disposed in gaps between the plurality of transparent display modules; and a light-transmitting cover covering the front surface of the plurality of transparent display modules and the front surface of the filler. The filler includes: a first light-transmitting resin layer which is disposed in a gap between light-transmitting substrates of adjacent transparent display modules among the plurality of transparent display modules so as to be parallel with the light-transmitting substrates, and has a refractive index matched with the refractive index of the light-transmitting substrates; and a second light-transmitting resin layer which is disposed in a gap between front layers of adjacent transparent display modules among the plurality of transparent display modules so as to be parallel with the front layers, and has a color value matched with the color value of the front layers.

Description

Transparent display device

[0001] The present disclosure relates to a transparent display device.

[0002] Display devices can be classified into self-emissive displays, where each pixel emits light on its own, and light-emitting displays, which require a separate light source.

[0003] Liquid Crystal Displays (LCDs) are representative light-emitting displays that require a backlight unit to supply light from the back of the display panel, a liquid crystal layer to act as a switch to pass or block light, and a color filter to convert the supplied light into the desired color. Because of this, they are structurally complex and have limitations in achieving thin thicknesses.

[0004] On the other hand, self-emissive displays, in which each pixel is equipped with a light-emitting element to emit light independently, do not require components such as backlight units and liquid crystal layers, and can also omit color filters. This results in a structurally simple design that offers high design freedom. Furthermore, not only can a thin thickness be achieved, but excellent contrast ratio, brightness, and viewing angle can also be realized.

[0005] Among self-emissive displays, micro LED displays are composed of multiple LEDs with a size in the micro range. Compared to LCDs that require a backlight, micro LED displays can provide excellent contrast, excellent response time, and excellent energy efficiency.

[0006] In addition, when using micro LEDs, a transparent display device can be manufactured because the area occupied by wiring and LEDs can be minimized or reduced.

[0007] Due to technical and economic limitations in manufacturing large transparent display devices of relatively large size as a single panel, a method of tiling multiple transparent display modules is being proposed as an alternative. In this tiling method, the seams between the transparent display modules may be visually visible.

[0008] An embodiment of the present disclosure provides a transparent display device improved to reduce the visibility of gaps between a plurality of transparent display modules.

[0009] An embodiment of the present disclosure provides a transparent display device improved to prevent and / or reduce damage to a light-transmitting resin placed in the gap between a plurality of transparent display modules.

[0010] An embodiment of the present disclosure provides an improved transparent display device that allows the transparent display module to be easily separated from the base substrate when repairing or replacing the transparent display module.

[0011] An embodiment of the present disclosure provides an improved transparent display device that allows a front optical layer, such as an optical film, to be easily separated from a light-transmitting cover covering the front of a transparent display module.

[0012] The technical problems to be solved in this document are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this invention belongs from the description below.

[0013] A transparent display device according to an exemplary embodiment of the present disclosure may include a plurality of transparent display modules, each comprising a display and arranged in an M*N matrix form, a filler disposed in a gap between the plurality of transparent display modules, and a light-transmitting cover covering the front surface of the plurality of transparent display modules and the front surface of the filler. Each of the plurality of transparent display modules may include a light-transmitting substrate, a front layer disposed in front of the light-transmitting substrate comprising a plurality of light-emitting elements including a light-emitting circuit mounted on the front surface of the light-transmitting substrate and configured to emit light forward, and a front layer comprising a mounting surface cover that surrounds the front surface of the plurality of light-emitting elements and the light-transmitting substrate and is configured to allow light to pass through. The above filler may include a first light-transmitting resin layer disposed side-by-side with the light-transmitting substrate in the gap between adjacent transparent display modules among the plurality of transparent display modules and having a refractive index matched with the refractive index of the light-transmitting substrate, and a second light-transmitting resin layer disposed side-by-side with the front layer in the gap between adjacent transparent display modules among the plurality of transparent display modules and having a color value matched with the color value of the front layer.

[0014] A transparent display device according to an exemplary embodiment of the present disclosure may include a base substrate that is provided to allow light to pass through, a plurality of transparent display modules each comprising a transparent display and arranged on the front surface of the base substrate, a filler disposed in a gap between the plurality of transparent display modules, and a light-transmitting cover including a first region covering the front surface of the plurality of transparent display modules and a second region covering the front surface of the filler. Each of the plurality of transparent display modules may include a light-transmitting substrate, a circuit pattern layer provided on the front surface of the light-transmitting substrate, a plurality of light-emitting elements including a light-emitting circuit mounted on the front surface of the light-transmitting substrate and electrically connected to the circuit pattern layer, and a front layer including a mounting surface cover that surrounds the front surface of the circuit pattern layer, the plurality of light-emitting elements, and the light-transmitting substrate and is provided to allow light to pass through. The above filler may include a first light-transmitting resin layer disposed side-by-side with the light-transmitting substrate in the gap and having a refractive index matched with the refractive index of the light-transmitting substrate, and a second light-transmitting resin layer disposed side-by-side with the front layer in the gap and having a color value matched with the color value of the front layer. The transmittance of light passing sequentially through the light-transmitting substrate, the front layer, and the first region, and the transmittance of light passing sequentially through the first light-transmitting resin layer, the second light-transmitting resin layer, and the second region may be matched with each other.

[0015] A transparent display device according to an exemplary embodiment of the present disclosure may include a base substrate that is provided to allow light to pass through, a plurality of transparent display modules each comprising a transparent display and mounted on the front surface of the base substrate, and a light-transmitting resin that is provided to allow light to pass through. Each of the plurality of transparent display modules may include a light-transmitting substrate and a front layer disposed on the front surface of the light-transmitting substrate, comprising a circuit pattern layer provided on the front surface of the light-transmitting substrate, a plurality of light-emitting elements including a light-emitting circuit mounted on the front surface of the light-transmitting substrate and electrically connected to the circuit pattern layer, and a mounting surface cover that surrounds the front surface of the circuit pattern layer, the plurality of light-emitting elements, and the light-transmitting substrate and is provided to allow light to pass through. A first portion of the light-transmitting resin may fill a gap between the plurality of transparent display modules. A second portion of the light-transmitting resin may cover the front surface of the plurality of transparent display modules. The refractive index of the light-transmitting resin may be matched to the refractive index of the light-transmitting substrate. The color value of the light-transmitting resin can be matched with the color value of the front layer. The transmittance of light passing sequentially through the base substrate, the light-transmitting substrate, the front layer, and the second portion of the light-transmitting resin, and the transmittance of light passing sequentially through the base substrate and the first portion of the light-transmitting resin can be matched with each other.

[0016] The above and other aspects, features, and advantages of specific embodiments of the present disclosure will become more apparent from the following detailed description together with the accompanying drawings.

[0017] FIG. 1 is a perspective view illustrating a transparent display device according to various embodiments.

[0018] FIG. 2 is a diagram illustrating an example of installation of a transparent display device according to various embodiments.

[0019] FIG. 3 is an enlarged cross-sectional view showing an enlarged portion of a transparent display module of a transparent display device according to various embodiments.

[0020] FIG. 4 is a diagram illustrating a plurality of transparent display modules of a transparent display device according to various embodiments, showing a tiled arrangement and the gaps between the plurality of transparent display modules.

[0021] FIG. 5 is an enlarged cross-sectional view illustrating a plurality of transparent display modules disposed on a base substrate of a transparent display device according to various embodiments and the gaps between them.

[0022] FIG. 6 is an enlarged cross-sectional view illustrating a portion of a transparent display device according to various embodiments.

[0023] FIG. 7 is an enlarged cross-sectional view illustrating various configurations such as a base substrate of a transparent display device according to various embodiments, a plurality of transparent display modules disposed on the base substrate, a filler disposed in the gap between the plurality of transparent display modules, a light-transmitting cover covering the front of the plurality of transparent display modules and the filler, and a rear adhesive layer that adheres the plurality of transparent display modules to the base substrate.

[0024] FIG. 8 is an enlarged cross-sectional view illustrating various configurations of a transparent display device according to various embodiments, such as a plurality of transparent display modules, a filler disposed in the gap between the plurality of transparent display modules, a light-transmitting cover covering the front of the plurality of transparent display modules and the filler, a front optical layer disposed on the front of the light-transmitting cover, a protective film, and a front adhesive layer that adheres the front optical layer to the plurality of transparent display modules.

[0025] FIG. 9 is an enlarged cross-sectional view illustrating a portion of a transparent display device according to various embodiments.

[0026] FIG. 10 is an enlarged cross-sectional view illustrating a portion of a transparent display device according to various embodiments.

[0027] FIG. 11 is a graph showing the yellowness according to the total light transmittance in a transparent display device according to various embodiments and a transparent display device according to a comparative embodiment.

[0028] FIG. 12 is a graph showing the difference in saturation between the area of ​​the transparent display module and the area of ​​the gap according to the amount of dye added to the light-transmitting resin in a transparent display device according to various embodiments and a display device according to a comparative embodiment.

[0029] The various exemplary embodiments and configurations illustrated in the drawings described in this disclosure are merely examples, and various variations that may replace or modify the embodiments and drawings of this specification may exist at the time of filing this application.

[0030] Additionally, the same reference numerals or symbols presented in each drawing of this specification represent parts or components that perform substantially the same function.

[0031] Furthermore, the terms used in this specification are for describing various embodiments and are not intended to limit or / or restrict the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0032] Additionally, terms including ordinal numbers, such as "first," "second," etc., as used herein may be used to describe various components, but said components are not limited by said terms. Such terms are used merely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0033] The terms 'part, module, component, block' as used in the specification may be implemented in software or hardware, and depending on the embodiments, a plurality of 'parts, modules, components, blocks' may be implemented as a single component, or a single 'part, module, component, block' may include a plurality of components.

[0034] Various exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0035] In describing various embodiments of the present disclosure with reference to FIGS. 1 to 12, terms such as "front-back direction," "vertical direction," and "horizontal direction (left-right direction)" used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms. For example, the term "front-back direction" below may mean a direction parallel to the X direction based on the drawings. For example, "vertical direction" may mean a direction parallel to the Z direction based on the drawings. For example, the term "horizontal direction (left-right direction)" below may each mean a direction parallel to the Y direction based on the drawings.

[0036] The XYZ axis coordinate system illustrated in FIGS. 1 to 10 is based on a transparent display device (1) according to various embodiments, and the plane on which the screen of the transparent display device (1) is placed can be defined as the YZ plane, and the direction in which an image is output from the transparent display device (1) or the direction in which light is emitted from a light-emitting element can be defined as the X direction.

[0037] In the following exemplary embodiments, the direction in which an image is output from the transparent display device (1) or the direction in which light is emitted from the light-emitting element may be defined as 'forward', and the opposite direction may be defined as 'backward'.

[0038] FIG. 1 is a perspective view illustrating an example of a transparent display device according to various embodiments. FIG. 2 is a diagram illustrating an example of installation of a transparent display device according to various embodiments.

[0039] Referring to FIGS. 1 and FIGS. 2, a transparent display device (1) according to various embodiments of the present disclosure is a device capable of processing an image signal received from the outside and visually displaying the processed image.

[0040] For example, a transparent display device (1) according to various embodiments of the present disclosure can be implemented in various forms, such as a television (TV), a monitor which is a type of output device for a computer, a portable multimedia device, or a portable communication device. For example, a transparent display device (1) according to various embodiments of the present disclosure may be a large format display (LFD) installed outdoors, such as on a rooftop or at a bus stop. Outdoors is not necessarily limited to open areas; even if indoors, a transparent display device (1) according to various embodiments of the present disclosure may be installed in any place where many people can enter and exit, such as a subway station, shopping mall, movie theater, company, or store. As long as the transparent display device (1) according to various embodiments of the present disclosure is a device that visually displays images, its type is not limited to what has been described above.

[0041] For example, the transparent display device (1) can be installed in a standing manner on a floor surface or furniture indoors or outdoors. For example, the transparent display device (1) can be installed on a wall surface or inside a wall of a building or other structure. For example, the transparent display device (1) can be installed on a wall by a wall mount device.

[0042] In FIG. 1, the transparent display device (1) is described as a flat display device with a flat screen, but is not limited thereto. The transparent display device (1) according to various embodiments of the present disclosure may include a curved display device or a variable (bendable or flexible) display device capable of varying between a flat state and a curved state. The configuration of the present disclosure described below can be applied to transparent display devices of various shapes regardless of the screen size or aspect ratio of the transparent display device.

[0043] The transparent display device (1) can receive content including video signals and audio signals from various content sources and output video and audio corresponding to the video signals and audio signals. For example, the transparent display device (1) can receive content data through a broadcast receiving antenna or a wired cable, receive content data from a content playback device, or receive content data from a content provider's content provision server.

[0044] The transparent display device (1) can display an image corresponding to video data and output sound corresponding to audio data. For example, the transparent display device (1) can restore multiple image frames included in the video data and continuously display multiple image frames. In addition, the transparent display device (1) can restore an audio signal included in the audio data and continuously output sound according to the audio signal.

[0045] A transparent display device (1) may include a screen configured to display an image. The screen may be provided on one side of the transparent display device (1). The side on which the screen is provided may be defined as the front side of the transparent display device (1). The screen may be provided on the front of the transparent display device (1). The screen may be configured to display an image forward. For example, the screen may display a still image or a video. For example, the screen may display a two-dimensional planar image or a three-dimensional stereoscopic image.

[0046] Multiple pixels may be formed on the screen. An image displayed on the screen may be formed by light emitted by each of the multiple pixels. For example, an image may be formed on the screen by combining the light emitted by multiple pixels as if in a mosaic.

[0047] Each of the plurality of pixels may emit light of various brightness and various colors. Specifically, each of the plurality of pixels may include subpixels, and the subpixels may include a red subpixel capable of emitting red light, a green subpixel capable of emitting green light, and a blue subpixel capable of emitting blue light. For example, red light may represent light with a wavelength of approximately 620 nm (nanometer, one-billionth of a meter) to 750 nm, green light may represent light with a wavelength of approximately 495 nm to 570 nm, and blue light may represent light with a wavelength of approximately 450 nm to 495 nm.

[0048] Each of the multiple pixels can emit light of various brightness and various colors through a combination of light emitted from the red subpixel, green subpixel, and blue subpixel, respectively.

[0049] Subpixels can be arranged along the horizontal direction (Y direction). Subpixels can be arranged along the vertical direction (Z). Alternatively, subpixels may not be arranged in a straight line with each other.

[0050] A transparent display device (1) according to one embodiment may be a self-emissive display device in which a light-emitting element is arranged for each pixel, so that each pixel can emit light on its own. In such an embodiment, unlike a liquid crystal display type, the transparent display device (1) does not need to be equipped with components such as a backlight unit or a liquid crystal layer, so a thin thickness can be achieved, and it has a relatively simple structure, allowing for various design changes.

[0051] A transparent display device (1) according to one embodiment may employ an inorganic light-emitting diode, such as an inorganic light-emitting diode, as a light-emitting element placed in each pixel. The inorganic light-emitting diode has a faster response speed compared to an organic light-emitting diode, such as an OLED, and can achieve high brightness with low power consumption.

[0052] Unlike organic light-emitting devices that are vulnerable to exposure to moisture and oxygen, require an encapsulation process, and have poor durability, an inorganic light-emitting device that can be included in a transparent display device (1) according to one embodiment can have strong durability without requiring a separate encapsulation process.

[0053] The inorganic light-emitting element employed in the transparent display device (1) according to one embodiment may be a micro LED having a short side length of approximately 100 μm, approximately tens of μm, or several μm. In this way, by employing a micro LED, the pixel size can be reduced and high resolution can be achieved within the same screen size.

[0054] If LED chips are manufactured in micro-sized units, the problem of inorganic materials breaking when bent can be solved. In other words, if micro LED chips are transferred onto a flexible substrate, the LED chips do not break even if the substrate is bent, making it possible to realize flexible display devices.

[0055] A display device employing micro LEDs can be applied in various fields by utilizing ultra-small pixel size and thin thickness. For example, as shown in FIG. 1, a large-area screen can be realized by tiling a plurality of transparent display modules (10) on which a plurality of micro LEDs are transferred onto a base substrate (20), and such a large-area screen display device can be used as signage, an electronic display board, etc.

[0056] A display device having a plurality of micro LEDs transferred thereon, such as a transparent display device (1) according to one embodiment, can be flexibly implemented, and by utilizing this feature, it may be implemented as a foldable display device or a rollable display device, etc.

[0057] A transparent display device (1) according to one embodiment of the present disclosure may be configured to allow light to pass through. For example, the transparent display device (1) may be configured to allow light to pass through in the front-back direction (X). For example, the transparent display device (1) may be configured to allow light to pass through from the front to the rear or from the rear to the front. As shown in FIG. 2, a viewer can see not only the image displayed on the screen of the transparent display device (1) but also objects beyond the image through the transparent display device (1).

[0058] A transparent display device (1) may include a plurality of transparent display modules (10) and a base substrate (20).

[0059] Each of the plurality of transparent display modules (10) may be configured to output an image. The transparent display device (1) may provide one large image in which the images of each of the plurality of transparent display modules (10) are combined.

[0060] Each of the plurality of transparent display modules (10) can be configured to allow light to pass through. Each of the plurality of transparent display modules (10) can be configured to allow light to pass through in the front-rear direction (X).

[0061] A plurality of transparent display modules (10) may be arranged on a base substrate (20). A plurality of transparent display modules (10) may be arranged on one side (e.g., the front) of the base substrate (20). A plurality of transparent display modules (10) may be mounted on the base substrate (20). A plurality of transparent display modules (10) may be supported by the base substrate (20). A plurality of transparent display modules (10) may be tiled on the base substrate (20). A plurality of transparent display modules (10) may be arranged on the base substrate (20) in a matrix form of M*N (where M and N are natural numbers, and at least one of M and N is a natural number greater than 1).

[0062] The base substrate (20) may be provided to allow light to pass through. The base substrate (20) may be provided to allow light to pass through in the front-rear direction (X). For example, the base substrate (20) may include a material such as glass or a light-transmitting resin.

[0063] In this way, a transparent display device (1) according to one embodiment may be configured to allow light to pass through by including each of the transparent display modules (10) and the base substrate (20), respectively.

[0064] As described above, the transparent display device (1) according to one embodiment may be a self-emissive display device that uses an inorganic light-emitting element as a light source. Accordingly, the transparent display device (1) does not need to be equipped with a backlight unit, a liquid crystal layer, or an encapsulation layer, and can be implemented with a very small size micro LED and a driving circuit and wiring for driving it, which may be more advantageous for securing the aperture ratio, which is one of the important factors in implementing the transparent display device (1).

[0065] FIG. 3 is an enlarged cross-sectional view showing an enlarged portion of a transparent display module of a transparent display device according to various embodiments.

[0066] With reference to FIG. 3, the structure of one of the transparent display modules (10) included in a transparent display device (1) according to one embodiment of the present disclosure is described in detail, and the structure of the transparent display module (10) described below can be applied to each of the transparent display modules (10).

[0067] The transparent display module (10) may include a light-transmitting substrate (11). The light-transmitting substrate (11) may be provided to support other components of the transparent display module (10).

[0068] The light-transmitting substrate (11) may be configured to allow light to pass through. For example, the light-transmitting substrate (11) may be configured to allow light to pass through in the front-rear direction (X). The light-transmitting substrate (11) may include a material such as transparent glass or resin.

[0069] The transparent display module (10) may include a circuit pattern layer (13) provided on one side of a light-transmitting substrate (11). The circuit pattern layer (13) may be provided on the mounting surface (11a) of the light-transmitting substrate (11). The circuit pattern layer (13) may be provided on the front surface of the light-transmitting substrate (11). The circuit pattern layer (13) may be electrically connected to a light-emitting element (14) to be described later, which is mounted on the mounting surface (11a) of the light-transmitting substrate (11). The circuit pattern layer (13) may transmit an electrical signal from the driving board of the transparent display device (1) to the light-emitting element (14). The circuit pattern layer (13) may apply a driving voltage / current to the light-emitting element (14).

[0070] For example, the circuit pattern layer (13) may include a thin film transistor (TFT) layer and various wirings (e.g., data lines, gate lines, power lines, etc.).

[0071] The thin-film transistor layer may include a transistor circuit for individually controlling the light-emitting element (14) to be described later.

[0072] Various wirings can transmit various electrical signals (e.g., data signal, gate signal, power signal) to the light-emitting element (14).

[0073] The transparent display module (10) may include a plurality of light-emitting elements (14) arranged to emit light. The plurality of light-emitting elements (14) may be arranged to emit light approximately forward. The plurality of light-emitting elements (14) may include pixels arranged on the screen of the transparent display device (1).

[0074] A plurality of light-emitting elements (14) may be mounted on a light-transmitting substrate (11). A plurality of light-emitting elements (14) may be mounted on a mounting surface (11a) of the light-transmitting substrate (11). A plurality of light-emitting elements (14) may be mounted on the front surface of the light-transmitting substrate (11). A plurality of light-emitting elements (14) may be disposed on a circuit pattern layer (13) provided on the mounting surface (11a) of the light-transmitting substrate (11).

[0075] The transparent display module (10) may include a mounting surface cover (15). The mounting surface cover (15) may enclose a plurality of light-emitting elements (14). The mounting surface cover (15) may enclose a circuit pattern layer (13). The mounting surface cover (15) may cover the front surface of a light-transmitting substrate (11). The mounting surface cover (15) may cover the mounting surface (11a) of the light-transmitting substrate (11).

[0076] The mounting surface cover (15) can protect various components provided on the mounting surface (11a) of the light-transmitting substrate (11), such as a plurality of light-emitting elements (14) and a circuit pattern layer (13), by covering them. For example, the mounting surface cover (15) may have a roughly flat front surface, so that the front surface of the transparent display module (10) can be flat overall.

[0077] The mounting surface cover (15) can be provided to allow light to pass through. The mounting surface cover (15) can be provided to allow light to pass through in the front and rear directions.

[0078] For example, the mounting surface cover (15) may include a material such as a light-transmitting resin. For example, the mounting surface cover (15) may be formed by applying a light-transmitting resin to the mounting surface (11a) of a light-transmitting substrate (11) on which a circuit pattern layer (13) and a plurality of light-emitting elements (14) are provided, flattening the front surface, and then curing it.

[0079] A transparent display device (1) may include a front layer (12) disposed in front of a light-transmitting substrate (11). The front layer (12) may be disposed on the front surface of the light-transmitting substrate (11). The front layer (12) may include a circuit pattern layer (13). The front layer (12) may include a light-emitting element (14). The front layer (12) may include a mounting surface cover (15). That is, the aforementioned circuit pattern layer (13), light-emitting element (14), and mounting surface cover (15) may include the front layer (12) in front of the light-transmitting substrate (11).

[0080] With the above configuration, the transparent display module (10) can be configured to output an image forward and allow light to be transmitted in the front-rear direction (X).

[0081] FIG. 4 is a diagram illustrating a plurality of transparent display modules of a transparent display device according to various embodiments, with the plurality of transparent display modules tiled and the gaps between the plurality of transparent display modules. FIG. 5 is an enlarged cross-sectional view illustrating a plurality of transparent display modules arranged on a base substrate of a transparent display device according to various embodiments and the gaps between them.

[0082] Referring to FIGS. 4 and 5, a plurality of transparent display modules (10) of a transparent display device (1) according to one embodiment of the present disclosure may be tiled on a base substrate (20). For example, a plurality of transparent display modules (10) may be arranged in a matrix form relative to each other. FIG. 4 illustrates an example in which a plurality of transparent display modules (10) are arranged in a matrix form having two rows and four columns, but the arrangement of the transparent display modules (10) in various embodiments is not limited thereto.

[0083] A plurality of transparent display modules (10) may be arranged adjacent to each other. However, a gap (G) may be formed between a pair of adjacent transparent display modules (10) among the plurality of transparent display modules (10). Although FIGS. 4 and 5 illustrate in detail the formation of a gap (G) between a pair of transparent display modules (10) adjacent to each other in the horizontal direction (Y), a gap (G) may also be formed between a pair of display modules (10) adjacent to each other in the vertical direction (Z). For example, among a plurality of transparent display modules (10), a gap (G) may be formed between the first display module (10a) and the second display module (10b) adjacent to each other in the horizontal direction (Y), between the second display module (10b) and the third display module (10c), between the third display module (10c) and the fourth display module (10d), between the fifth display module (10e) and the sixth display module (10f), between the sixth display module (10f) and the seventh display module (10g), and between the seventh display module (10g) and the eighth display module (10h), as well as between the first display module (10a) and the fifth display module (10e), between the second display module (10b) and the sixth display module (10f), between the third display module (10c) and the seventh display module (10g), and between the fourth display module (10d) and the eighth display module (10h) adjacent to each other in the vertical direction (Z). A gap (G) may be formed.

[0084] As shown in FIG. 5, a gap (G) can be formed between adjacent sides (10s) of each of a pair of adjacent transparent display modules (10).

[0085] A gap (G) formed between multiple transparent display modules (10) has a light transmittance, refractive index, color, brightness, saturation, etc. that are different from each transparent display module (10), and there is a possibility that it can be easily seen. If the gap (G) is seen through the screen of the transparent display device (1), it may cause visual discomfort to the viewer, so it is important to reduce the visibility of the gap (G).

[0086] FIG. 6 is an enlarged cross-sectional view illustrating a portion of a transparent display device according to various embodiments.

[0087] Referring to FIG. 6, a transparent display device (1) according to one embodiment of the present disclosure may include a filler (30) disposed in a gap (G) between a plurality of transparent display modules (10). The filler (30) may fill the gap (G). The filler (30) may be disposed between the sides (10s) of a pair of transparent display modules (10) adjacent to each other among the plurality of transparent display devices (1). For example, the filler (30) may be coupled to each side (10s) of one transparent display module (10) and the side (10s) of another transparent display module (10) adjacent thereto. For example, the filler (30) may be attached to each side (10s) of one transparent display module (10) and the side (10s) of another transparent display module (10) adjacent thereto.

[0088] The filler (30) may be provided to allow light to pass through. The filler (30) may be provided to allow light to pass through in the front-rear direction (X). Light may pass through the base substrate (20) and the filler (30) sequentially and proceed from the rear to the front of the transparent display device (1), or it may pass through the filler (30) and the base substrate (20) sequentially and proceed from the front to the rear of the transparent display device (1).

[0089] For example, the filler (30) may include a transparent resin. For example, the filler (30) may be formed by the transparent resin being injected into the gap (G) and then cured (e.g., cured using heat or ultraviolet light).

[0090] The transparent display device (1) may include a light-transmitting cover (40). The light-transmitting cover (40) may cover the front of a plurality of transparent display modules (10). The light-transmitting cover (40) may cover the front of a filler (30). The light-transmitting cover (40) may include a first area (41) that covers the front of a plurality of transparent display modules (10) and a second area (42) that covers the front of a filler (30).

[0091] The light-transmitting cover (40) may be provided to allow light to pass through. The light-transmitting cover (40) may be provided to allow light to pass through in the front-rear direction (X). Light may pass through the base substrate (20), the transparent display module (10), and the first region (41) of the light-transmitting cover (40) sequentially and proceed from the rear to the front of the transparent display device (1), or it may pass through the first region (41) of the light-transmitting cover (40), the transparent display module (10), and the base substrate (20) sequentially and proceed from the front to the rear of the transparent display device (1). Light may sequentially pass through the base substrate (20), the filler (30), and the second region (42) of the light-transmitting cover (40) and proceed forward from the rear of the transparent display device (1), or it may sequentially pass through the second region (42) of the light-transmitting cover (40), the filler (30), and the base substrate (20) and proceed from the front to the rear of the transparent display device (1).

[0092] For example, the light-transmitting cover (40) may include a light-transmitting resin. For example, the light-transmitting cover (40) may be formed by applying a light-transmitting resin to the front surface of a plurality of transparent display modules (10) and fillers (30) and then curing it (e.g., curing using heat or ultraviolet rays).

[0093] According to one embodiment, the filler (30) and the light-transmitting cover (40) may each comprise a light-transmitting resin. For example, the filler (30) and the light-transmitting cover (40) may comprise a curable resin such as epoxy. The filler (30) and the light-transmitting cover (40) may be referred to as 'light-transmitting resin', either individually or as a whole.

[0094] In order to more efficiently prevent and / or reduce the visibility of the gap (G) between multiple transparent display modules (10) or the filler (30) filled therein, the characteristics such as light transmittance, refractive index, and color value of the filler (30) to the light-transmitting cover (40) can be determined as follows.

[0095] According to one embodiment, at least a portion of the filler (30) may have a refractive index that matches the refractive index of the light-transmitting substrate (11). For example, the filler (30) may include a first light-transmitting resin layer (31) having a refractive index that matches the refractive index of the light-transmitting substrate (11).

[0096] The meaning of ‘matching refractive indices’ may be that the refractive indices are identical or very similar, so that the filler (30) placed in the gap (G) between the multiple transparent display modules (10) and the one between them appears almost indistinguishable. The refractive index of the first light-transmitting resin layer (31) and the refractive index of the light-transmitting substrate (11) may be very similar to each other, to the extent that they are identical or nearly identical. The difference between the refractive index of the first light-transmitting resin layer (31) and the refractive index of the light-transmitting substrate (11) may be less than or equal to a predetermined value.

[0097] According to one embodiment, the refractive index of the first light-transmitting resin layer (31) and the refractive index of the light-transmitting substrate (11) that match each other can be determined as refractive indices for a specific wavelength. For example, the refractive index of the first light-transmitting resin layer (31) in the visible light region and the refractive index of the light-transmitting substrate (11) in the visible light region can be matched to each other.

[0098] For example, the difference between the refractive index of the first light-transmitting resin layer (31) and the refractive index of the light-transmitting substrate (11) may be approximately 0.03 or less.

[0099] For example, the refractive index of the first light-transmitting resin layer (31) may be approximately 1.50 to 1.52.

[0100] The first light-transmitting resin layer (31) may be placed between the light-transmitting substrates (11) of each of the adjacent transparent display modules (10). The first light-transmitting resin layer (31) may be placed in the gap formed between the light-transmitting substrates (11) of each of the adjacent transparent display modules (10). The first light-transmitting resin layer (31) may be placed between the sides (11s) of the light-transmitting substrates (11) of each of the adjacent transparent display modules (10). For example, the first light-transmitting resin layer (31) may be in contact with the sides (11s) of the light-transmitting substrates (11) of each of the adjacent transparent display modules (10). For example, the first light-transmitting resin layer (31) may be attached to the sides (11s) of the light-transmitting substrates (11) of each of the adjacent transparent display modules (10).

[0101] The first light-transmitting resin layer (31) can be positioned parallel to the light-transmitting substrate (11) in the gap between each of the light-transmitting substrates (11) of the adjacent transparent display modules (10). For example, the rear surface of the first light-transmitting resin layer (31) can be approximately parallel to the rear surface of the light-transmitting substrate (11). For example, the front surface of the first light-transmitting resin layer (31) can be approximately parallel to the front surface of the light-transmitting substrate (11) (e.g., mounting surface (11a)).

[0102] According to one embodiment, at least a portion of the filler (30) may have a color value that matches the color value of the front layer (12). For example, the filler (30) may include a second transparent resin layer (32) that has a color value that matches the color value of the front layer (12). 'Color value' refers to a value that quantifies the color of an object, such as its hue, brightness, and saturation, according to specific criteria. For example, 'color value' may be a numerical value for a color defined by coordinates such as the CIELAB color space.

[0103] Since the front layer (12) may vary in the arrangement of light-emitting elements (14), circuit pattern layers (13), etc., and the thickness of the mounting surface cover (15) depending on its position within the transparent display module (10), its color value may be determined by a certain standard. For example, the color value of the front layer (12) may be defined as the average color value for the entire area of ​​the front layer (12) included in one transparent display module (10). For example, the color value of the front layer (12) may be defined as the color value in the area close to the gap (G), that is, the area close to the side (12s) of the front layer (12).

[0104] The meaning of ‘color values ​​match’ may be that the color values ​​are identical or very similar, so that the filler (30) placed in the gap (G) between the multiple transparent display modules (10) and the filler (30) placed therein appears almost indistinguishable. The color value of the second light-transmitting resin layer (32) and the color value of the front layer (12) may be very similar to each other, to the extent that they are identical or nearly identical. The difference between the color value of the second light-transmitting resin layer (32) and the color value of the front layer (12) may be less than or equal to a predetermined value.

[0105] According to one embodiment, the color value of the second light-transmitting resin layer (32) and the color value of the front layer (12) that match each other can be defined as color values ​​according to the yellow index.

[0106] For example, the difference between the color value according to the yellowness of the second light-transmitting resin layer (32) and the color value according to the yellowness of the front layer (12) may be approximately 5 or less.

[0107] The second light-transmitting resin layer (32) may be placed between the front layers (12) of each of the adjacent transparent display modules (10). The second light-transmitting resin layer (32) may be placed in the gap formed between the front layers (12) of each of the adjacent transparent display modules (10). The second light-transmitting resin layer (32) may be placed between the sides (12s) of the front layers (12) of each of the adjacent transparent display modules (10). For example, the second light-transmitting resin layer (32) may be in contact with the sides (12s) of the front layers (12) of each of the adjacent transparent display modules (10). For example, the second light-transmitting resin layer (32) may be attached to the sides (12s) of the front layers (12) of each of the adjacent transparent display modules (10).

[0108] The second light-transmitting resin layer (32) can be positioned parallel to the front layer (12) in the gap between each front layer (12) of the adjacent transparent display modules (10). For example, the rear surface of the second light-transmitting resin layer (32) can be approximately parallel to the rear surface of the front layer (12). For example, the front surface of the second light-transmitting resin layer (32) can be approximately parallel to the front surface of the front layer.

[0109] According to one embodiment, the light transmittance of the area corresponding to the transparent display module (10) and the area corresponding to the gap (G) in the transparent display device (1) can be matched with each other. For example, the transmittance of light passing sequentially through the first area (41) of the light-transmitting substrate (11), the front layer (12), and the light-transmitting cover (40) and the transmittance of light passing sequentially through the second area (42) of the first light-transmitting resin layer (31), the second light-transmitting resin layer (32), and the light-transmitting cover (40) can be matched with each other.

[0110] The meaning of ‘light transmittance is matched’ may be that the light transmittance is the same or very similar, so that the filler (30) placed in the gap (G) between the multiple transparent display modules (10) and the filler (30) placed therein is almost indistinguishable. The transmittance of light passing sequentially through the first region (41) of the light-transmitting substrate (11), the front layer (12), and the light-transmitting cover (40), and the transmittance of light passing sequentially through the first light-transmitting resin layer (31), the second light-transmitting resin layer (32), and the second region (42) of the light-transmitting cover (40) may be very similar to each other, to the extent that they are the same or nearly the same. The difference between the transmittance of light passing sequentially through the first region (41) of the light-transmitting substrate (11), the front layer (12), and the light-transmitting cover (40), and the transmittance of light passing sequentially through the first light-transmitting resin layer (31), the second light-transmitting resin layer (32), and the second region (42) of the light-transmitting cover (40) may be less than or equal to a predetermined value.

[0111] For example, the transmittance of light passing sequentially through the first region (41) of the light-transmitting substrate (11), the front layer (12), and the light-transmitting cover (40) can be defined as the average light transmittance over the entire area of ​​the first region (41) of the transparent display module (10) and the light-transmitting cover (40). For example, the transmittance of light passing sequentially through the first region (41) of the light-transmitting substrate (11), the front layer (12), and the light-transmitting cover (40) can be defined as the light transmittance in the area adjacent to the gap (G).

[0112] According to one embodiment, the transmittance of light passing sequentially through a first region (41) of a light-transmitting substrate (11), a front layer (12), and a light-transmitting cover (40) that are matched with each other, and the transmittance of light passing sequentially through a first light-transmitting resin layer (31), a second light-transmitting resin layer (32), and a second region (42) of a light-transmitting cover (40) can be determined as light transmittance for a specific wavelength. For example, the light transmittances can be matched with each other in the visible light region.

[0113] For example, the difference between the transmittance of light passing sequentially through the first region (41) of the light-transmitting substrate (11), the front layer (12), and the light-transmitting cover (40), and the transmittance of light passing sequentially through the first light-transmitting resin layer (31), the second light-transmitting resin layer (32), and the second region (42) of the light-transmitting cover (40) may be approximately 0.05 or less.

[0114] For example, the refractive index of the first light-transmitting resin layer (31) may be approximately 1.50 to 1.52.

[0115] By matching the optical characteristics as described above, the gap (G) between a plurality of transparent display modules (10) can be efficiently prevented / reduced.

[0116] In addition to the matching described above, the color value of the first light-transmitting resin layer (31) and the color value of the light-transmitting substrate (11) can also be matched with each other. The color value of the first light-transmitting resin layer (31) and the color value of the light-transmitting substrate (11) may be very similar to each other, to the extent that they are identical or nearly identical. The difference between the color value of the first light-transmitting resin layer (31) and the color value of the light-transmitting substrate (11) may be less than or equal to a predetermined value. For example, the first light-transmitting resin layer (31) and the light-transmitting substrate (11) may each have a color that is approximately close to colorless.

[0117] In addition to the matching described above, the refractive index of the second light-transmitting resin layer (32) and the refractive index of the front layer (12) can be matched with each other. The refractive index of the second light-transmitting resin layer (32) and the refractive index of the front layer (12) may be very similar, to the extent that they are identical or nearly identical. The difference between the refractive index of the second light-transmitting resin layer (32) and the refractive index of the front layer (12) may be less than or equal to a predetermined value. For example, the refractive index of the front layer (12) may be defined as the average refractive index over the entire area of ​​the front layer (12) included in a single transparent display module (10). For example, the refractive index of the front layer (12) may be defined as the refractive index in the area close to the gap (G), that is, the area close to the side (12s) of the front layer (12). For example, the refractive index of the second light-transmitting resin layer (32) may be approximately 1.4 to 1.51.

[0118] In order to improve the degree to which light is emitted forward, according to one embodiment, the refractive index of the light-transmitting cover (40) may be lower than the refractive index of the second light-transmitting resin layer (32). According to one embodiment, the light transmittance of the light-transmitting cover (40) may be higher than the light transmittance of the second light-transmitting resin layer (32).

[0119] According to one embodiment, the filler (30) may include a first color material having black and a second color material having a color different from black. For example, the second light-transmitting resin layer (32) may include a first color material having black and a second color material having a color different from black, and the color of the second light-transmitting resin layer (32) may vary depending on the composition ratio of the first color material and the second color material.

[0120] For example, the first color material of black included in the filler (30), particularly the second light-transmitting resin layer (32), may have a light transmittance of 0.9 or less. For example, the second color material may have a yellowness of 1 or more.

[0121] Preferably, the first black color material included in the filler (30), particularly the second light-transmitting resin layer (32), may be a black pigment. For example, the first black color material may include carbon black. In such an embodiment where the black color is implemented by carbon black, the control of the color of the light-transmitting resin may be easier, and a more detailed explanation thereof will be provided later with reference to FIGS. 11 and 12.

[0122] According to one embodiment, the rigidity of the light-transmitting cover (40) may be higher than the rigidity of the first light-transmitting resin layer (31) and the second light-transmitting resin layer (32). Thus, the first light-transmitting resin layer (31) and the second light-transmitting resin layer (32) can be protected from external impact. For example, rigidity may be defined as a bending modulus, Young's modulus, etc.

[0123] In order to prevent and / or reduce damage to the filler (30) by external force within the gap (G) between a plurality of light-transmitting display modules (10), it is preferable that the rigidity (e.g., bending modulus, Young's modulus) of the filler (30) including the first light-transmitting resin layer (31) and the second light-transmitting resin layer (32) be less than or equal to a predetermined value. For example, the bending modulus of the filler (30) including the first light-transmitting resin layer (31) and the second light-transmitting resin layer (32) may be 15,000 MPa or less. For example, the Young's modulus of the filler (30) including the first light-transmitting resin layer (31) and the second light-transmitting resin layer (32) may be 20 MPa or less.

[0124] However, this is not limited thereto, and according to various embodiments, the first light-transmitting resin layer (31) and the second light-transmitting resin layer (32) may have a range of rigidity.

[0125] According to one embodiment, in order to more efficiently prevent / reduce breakage of the filler (30), the filler (30) may be configured to have a high adhesion force with the side (10s) of the transparent display module (10). For example, the first light-transmitting resin layer (31) has an adhesion force of 1 N / mm with the side (11s) of the light-transmitting substrate (11). 2 It may be more than that. For example, the second light-transmitting resin layer (32) has an adhesion force of 1 N / mm with the side (12s) of the front layer (12). 2 It could be more than that.

[0126] According to one embodiment, the light-transmitting cover (40) may be configured to have a high adhesion force with the front layer (12). For example, the light-transmitting cover (40) has an adhesion force of 1 N / mm with the front surface of the front layer (12). 2 It could be more than that.

[0127] However, it is not limited thereto, and according to various embodiments, the adhesion force between the first light-transmitting resin layer (31) and the side (11s) of the light-transmitting substrate (11), the adhesion force between the second light-transmitting resin layer (32) and the side (12s) of the front layer (12), and the adhesion force between the light-transmitting cover (40) and the front surface of the front layer (12) can each be provided in various ways.

[0128] According to one embodiment, a plurality of transparent display modules (10) may be attached to a base substrate (20). The transparent display device (1) may include a rear adhesive layer (80) provided to attach a plurality of transparent display modules (10) to a base substrate (20).

[0129] The detailed structure of the rear adhesive layer (80) will be described later.

[0130] According to one embodiment, a transparent display device (1) may include a rear optical layer (60) disposed on the rear surface of a base substrate (20). The rear optical layer (60) may be attached to the rear surface of the base substrate (20). The rear optical layer (60) may be configured to improve the optical performance of the transparent display device (1). For example, the rear optical layer (60) may include an anti-reflection film configured to prevent / reduce thin film interference caused by light incident on the rear optical layer (60).

[0131] According to one embodiment, the transparent display device (1) may include a front optical layer (50) disposed on the front of a light-transmitting cover (40). The front optical layer (50) may be attached to the front of the light-transmitting cover (40). The front optical layer (50) may be configured to improve the optical performance of the transparent display device (1). For example, the front optical layer (50) may include a low-reflection film configured to prevent / reduce thin film interference caused by light incident on the front optical layer (50).

[0132] According to one embodiment, the transparent display device (1) may include a front adhesive layer (70) provided to attach a front optical layer (50) to a light-transmitting cover (40).

[0133] The detailed structure of the front adhesive layer (70) will be described later.

[0134] According to one embodiment, the transparent display device (1) may include a protective film (90) disposed on the front surface of the front optical layer (50). The protective film (90) may be attached to the front surface of the front optical layer (50). The protective film (90) may be provided to protect the front surface of the front optical layer (50) from the outside.

[0135] The configuration of the transparent display device (1) according to one embodiment described above with reference to FIG. 6 is merely an example, and the configurations included in the transparent display device (1) according to various embodiments are not limited thereto, and the transparent display device (1) may include various configurations.

[0136] FIG. 7 is an enlarged cross-sectional view illustrating various configurations such as a base substrate of a transparent display device according to various embodiments, a plurality of transparent display modules disposed on the base substrate, a filler disposed in the gap between the plurality of transparent display modules, a light-transmitting cover covering the front of the plurality of transparent display modules and the filler, and a rear adhesive layer that adheres the plurality of transparent display modules to the base substrate.

[0137] Referring to FIG. 7, a rear adhesive layer (80) of a transparent display device (1) according to one embodiment of the present disclosure may include a first rear adhesive (81) provided to be attached to a base substrate (20) and a second rear adhesive (82) provided to be attached to a plurality of display modules (10).

[0138] The first rear adhesive (81) may be provided on one side facing the base substrate (20) of the rear adhesive layer (80). The first rear adhesive (81) may be attached to the front surface of the base substrate (20).

[0139] The second rear adhesive (82) may be provided on one side of the rear adhesive layer (80) facing the plurality of transparent display modules (10). The second rear adhesive (82) may be attached to the rear surface of the plurality of transparent display modules (10). The second rear adhesive (82) may be positioned in front of the first rear adhesive (81).

[0140] According to one embodiment, the adhesive strength of the first rear adhesive (81) may be greater than the adhesive strength of the second rear adhesive (82).

[0141] For example, the first rear adhesive (81) may include an acrylic material. For example, the thickness of the first rear adhesive (81) may be approximately 20 to 100 micrometers. For example, the adhesive strength of the first rear adhesive (81) may be approximately 1 N / 25 mm or more.

[0142] For example, the second rear adhesive (82) may include a silicone material. For example, the thickness of the second rear adhesive (82) may be approximately 20 to 100 micrometers. For example, the adhesive strength of the second rear adhesive (82) may be approximately 0.11 N / 25 mm or less.

[0143] According to such an embodiment, the transparent display module (10) can be easily separated from the base substrate (20) when necessary. For example, when a force is applied to the transparent display module (10) at a 90-degree angle (for example, when a force is applied to the transparent display module (10) in the X direction relative to the base substrate (20), the transparent display module (10) can be easily separated from the base substrate (20).

[0144] The rear adhesive layer (80) may include a rear adhesive layer base (83) that forms the substrate of the rear adhesive layer (80). A first rear adhesive (81) may be provided on one side (e.g., rear side) of the rear adhesive layer base (83), and a second rear adhesive (82) may be provided on the other side (e.g., front side) of the rear adhesive layer base (83).

[0145] For example, the rear adhesive layer base (83) may include PET material.

[0146] However, it is not limited thereto, and for example, the rear adhesive layer (80) may include a first rear adhesive (81) and a second rear adhesive (82) having approximately the same material and approximately the same adhesive strength. For example, the rear adhesive layer (80) may be composed entirely of the same material.

[0147] FIG. 8 is an enlarged cross-sectional view illustrating various configurations of a transparent display device according to various embodiments, such as a plurality of transparent display modules, a filler disposed in the gap between the plurality of transparent display modules, a light-transmitting cover covering the front of the plurality of transparent display modules and the filler, a front optical layer disposed on the front of the light-transmitting cover, a protective film, and a front adhesive layer that adheres the front optical layer to the plurality of transparent display modules.

[0148] Referring to FIG. 8, the front adhesive layer (70) of a transparent display device (1) according to one embodiment of the present disclosure may include a first front adhesive (71) provided to be attached to a light-transmitting cover (40) and a second front adhesive (72) provided to be attached to a front optical layer (50).

[0149] The first front adhesive (71) may be provided on one side facing the light-transmitting cover (40) of the front adhesive layer (70). The first front adhesive (71) may be attached to the front surface of the light-transmitting cover (40).

[0150] The second front adhesive (72) may be provided on one side facing the front optical layer (50) of the front adhesive layer (70). The second front adhesive (72) may be attached to the rear surface of the front optical layer (50). The second front adhesive (72) may be positioned in front of the first front adhesive (71).

[0151] According to one embodiment, the adhesive strength of the first front adhesive (71) may be smaller than the adhesive strength of the second front adhesive (72).

[0152] For example, the first front adhesive (71) may include a silicone material. For example, the thickness of the first front adhesive (71) may be approximately 20 to 100 micrometers. For example, the adhesive strength of the first front adhesive (71) may be approximately 5 N / 25 mm or less.

[0153] For example, the second front adhesive (72) may include an acrylic material. For example, the thickness of the second front adhesive (72) may be approximately 20 to 100 micrometers. For example, the adhesive strength of the second front adhesive (72) may be approximately 20 N / 25 mm or more.

[0154] According to such an embodiment, the protective film (90) and the front optical layer (50) can be easily separated from the light-transmitting cover (40) when necessary. For example, when a force is applied 180 degrees to the protective film (90) and the front optical layer (50) (for example, when a force is applied to separate the protective film (90) and the front optical layer (50) in the Y direction or Z direction while flipping them 180 degrees relative to the light-transmitting cover (40), the protective film (90) and the front optical layer (50) can be easily separated from the light-transmitting cover (40).

[0155] The front adhesive layer (70) may include a front adhesive layer base (73) that forms the substrate of the front adhesive layer (70). A first front adhesive (71) may be provided on one side (e.g., rear side) of the front adhesive layer base (73), and a second front adhesive (72) may be provided on the other side (e.g., front side) of the front adhesive layer base (73).

[0156] For example, the front adhesive layer base (73) may include PET material.

[0157] However, it is not limited thereto, and for example, the front adhesive layer (70) may include a first front adhesive (71) and a second front adhesive (72) having approximately the same material and approximately the same adhesive strength. For example, the front adhesive layer (70) may be composed entirely of the same material.

[0158] FIG. 9 is an enlarged cross-sectional view illustrating a portion of a transparent display device according to various embodiments.

[0159] In describing an embodiment of the present disclosure with reference to FIG. 9, the same reference numerals may be used for configurations corresponding to the examples described with reference to FIG. 1 to 8, and corresponding descriptions may not be repeated.

[0160] Referring to FIG. 9, a transparent display device (1) according to one embodiment of the present disclosure may include a filler (130) disposed in a gap (G) between a plurality of transparent display modules (10).

[0161] The filler (130) may include a first light-transmitting resin layer (131) positioned alongside the light-transmitting substrate (11) and a second light-transmitting resin layer (132) positioned alongside the front layer (12).

[0162] The refractive index of the first light-transmitting resin layer (131) can be matched with the refractive index of the light-transmitting substrate (11). The refractive index of the second light-transmitting resin layer (132) can be the same as the refractive index of the first light-transmitting resin layer (131). For example, the refractive index of the filler (130) can be matched with the refractive index of the light-transmitting substrate (11). For example, the refractive index of the filler (130) in the visible light region can be matched with the refractive index of the light-transmitting substrate (11).

[0163] The color value of the second light-transmitting resin layer (132) can be matched with the color value of the front layer (12). The color value of the first light-transmitting resin layer (131) can be the same as the color value of the second light-transmitting resin layer (132). For example, the color value of the filler (130) can be matched with the color value of the front layer (12). For example, the color value according to the yellowness of the filler (130) can be matched with the color value according to the yellowness of the front layer (12).

[0164] According to one embodiment, the first light-transmitting resin layer (131) and the second light-transmitting resin layer (132) may be formed integrally. The filler (130) may be composed of an integral light-transmitting resin.

[0165] FIG. 10 is an enlarged cross-sectional view illustrating a portion of a transparent display device according to various embodiments.

[0166] In describing an embodiment of the present disclosure with reference to FIG. 10, the same reference numerals may be used for configurations corresponding to the examples described with reference to FIG. 1 to 9, and corresponding descriptions may not be repeated.

[0167] Referring to FIG. 10, a transparent display device (1) according to one embodiment of the present disclosure may include a filler (230) disposed in a gap (G) between a plurality of transparent display modules (10), and a light-transmitting cover (240) disposed in front of the plurality of transparent display modules (10) and the filler (230).

[0168] The filler (230) may include a first light-transmitting resin layer (231) positioned alongside the light-transmitting substrate (11) and a second light-transmitting resin layer (232) positioned alongside the front layer (12).

[0169] The light-transmitting cover (240) may include a first area (241) positioned in front of a plurality of display modules (10) and a second area (242) positioned in front of a second light-transmitting resin layer (232).

[0170] According to one embodiment, the refractive index of the first light-transmitting resin layer (231) may be matched with the refractive index of the light-transmitting substrate (11). The refractive index of the second light-transmitting resin layer (232) may be the same as the refractive index of the first light-transmitting resin layer (231). The refractive index of the light-transmitting cover (240) may be the same as the refractive index of the first light-transmitting resin layer (231). For example, the refractive index of the light-transmitting resin including the filler (230) and the light-transmitting cover (240) may be matched with the refractive index of the light-transmitting substrate (11). For example, the refractive index of the filler (230) in the visible light region may be matched with the refractive index of the light-transmitting substrate (11).

[0171] The color value of the second light-transmitting resin layer (232) may be matched with the color value of the front layer (12). The color value of the first light-transmitting resin layer (231) may be the same as the color value of the second light-transmitting resin layer (232). The color value of the light-transmitting cover (240) may be the same as the color value of the second light-transmitting resin layer (232). For example, the color value of the light-transmitting resin including the filler (30) and the light-transmitting cover (240) may be matched with the color value of the front layer (12). For example, the color value according to the yellowness of the light-transmitting resin may be matched with the color value according to the yellowness of the front layer (12).

[0172] According to one embodiment, the first light-transmitting resin layer (231), the second light-transmitting resin layer (232), and the light-transmitting cover (240) may be formed integrally. The light-transmitting resin including the filler (230) and the light-transmitting cover (240) may be composed of a single light-transmitting resin.

[0173] According to one embodiment, the transmittance of light passing sequentially through a base substrate (20), a light-transmitting substrate (11), a front layer (12), and a first portion of the light-transmitting resin (e.g., a first region (241) of the light-transmitting cover (240)) and the transmittance of light passing sequentially through a base substrate (20) and a second portion of the light-transmitting resin (e.g., a filler (230) and a second region (242) of the light-transmitting cover (240)) can be matched with each other. For example, the transmittance of light can be defined as the transmittance in the visible light region.

[0174] FIG. 11 is a graph showing the yellowness according to the total light transmittance in a transparent display device according to various embodiments and a transparent display device according to a comparative embodiment.

[0175] In the graph of Fig. 11, the horizontal axis represents the total light transmittance of the light-transmitting resin, and the total light transmittance may vary depending on the degree to which a coloring component is added to the light-transmitting resin. In the graph of Fig. 11, the vertical axis represents the yellowness of the light-transmitting resin.

[0176] In the graph of FIG. 11, the dotted line (G0) relates to a transparent display device according to a comparative example, and represents the relationship between total light transmittance and yellowness in an example of a transparent display device in which a general dye is added as a color material included in the light-transmitting resin. In the graph of FIG. 11, the solid line (G1) relates to a transparent display device according to one embodiment of the present disclosure, and represents the relationship between total light transmittance and yellowness in an example of a transparent display device in which a color material including carbon black as a black color material is added as a color material included in the light-transmitting resin.

[0177] Referring to FIG. 11, it can be seen that compared to the comparative example (G0), the change in yellowness with respect to the total light transmittance of the light-transmitting resin in the example of the present disclosure (G1) is smaller. That is, it can be more easily controlled to control the color of the light-transmitting resin independently of the light transmittance of the light-transmitting resin.

[0178] FIG. 12 is a graph showing the difference in saturation between the area of ​​the transparent display module and the area of ​​the gap according to the amount of dye added to the light-transmitting resin in a transparent display device according to various embodiments and a display device according to a comparative embodiment.

[0179] In the graph of Fig. 12, the horizontal axis represents the amount of coloring dye added to the light-transmitting resin. In the graph of Fig. 12, the vertical axis represents the difference in saturation according to the CIELAB color space between the area of ​​the transparent display module and the area of ​​the gap, specifically the difference in numerical values ​​(a*) regarding which color is skewed toward red or green and the difference in numerical values ​​(b*) regarding which color is skewed toward blue or yellow.

[0180] The graph on the left in FIG. 12 relates to a transparent display device according to a comparative embodiment, and shows the relationship between the difference in saturation between the area of ​​the transparent display module and the area of ​​the gap according to the amount of dye added to the transparent resin in an embodiment of a transparent display device in which a general dye is added as a color material included in the light-transmitting resin. The graph on the right in FIG. 12 relates to a transparent display device according to an embodiment of the present disclosure, and shows the relationship between the difference in saturation between the area of ​​the transparent display module and the area of ​​the gap according to the amount of dye added to the transparent resin in an embodiment of a transparent display device in which a color material including carbon black as a black color material is added as a color material included in the light-transmitting resin.

[0181] Referring to FIG. 12, it can be seen that, compared to the comparative example, the difference in saturation between the area of ​​the transparent display module (10) and the area of ​​the gap (G) in the embodiment of the present disclosure is smaller, thereby further improving the visibility of the gap (G).

[0182] A transparent display device according to an exemplary embodiment of the present disclosure may include a plurality of transparent display modules arranged in a matrix form of M*N, a filler disposed in a gap between the plurality of transparent display modules, and a light-transmitting cover covering the front surface of the plurality of transparent display modules and the front surface of the filler. Each of the plurality of transparent display modules may include a light-transmitting substrate, a front layer disposed in front of the light-transmitting substrate, a plurality of light-emitting elements mounted on the front surface of the light-transmitting substrate and configured to emit light forward, and a mounting surface cover that surrounds the plurality of light-emitting elements and the front surface of the light-transmitting substrate and is configured to allow light to pass through. The above filler may include a first light-transmitting resin layer disposed side-by-side with the light-transmitting substrate in the gap between adjacent transparent display modules among the plurality of transparent display modules and having a refractive index matched with the refractive index of the light-transmitting substrate, and a second light-transmitting resin layer disposed side-by-side with the front layer in the gap between adjacent transparent display modules among the plurality of transparent display modules and having a color value matched with the color value of the front layer.

[0183] The light-transmitting cover may include a first region covering the front surface of the plurality of transparent display modules and a second region covering the front surface of the filler. The transmittance of light passing sequentially through the light-transmitting substrate, the front layer, and the first region, and the transmittance of light passing sequentially through the first light-transmitting resin layer, the second light-transmitting resin layer, and the second region may be matched with each other.

[0184] The difference between the transmittance of light passing sequentially through the light-transmitting substrate, the front layer, and the first region, and the transmittance of light passing sequentially through the first light-transmitting resin layer, the second light-transmitting resin layer, and the second region, may be 0.05 or less.

[0185] The difference between the refractive index of the light-transmitting substrate and the refractive index of the first light-transmitting resin layer may be 0.03 or less.

[0186] The difference between the color value according to the yellow index of the front layer and the color value according to the yellow index of the second light-transmitting resin layer may be 5 or less.

[0187] The refractive index of the second light-transmitting resin layer and the refractive index of the front layer can be matched with each other.

[0188] The refractive index of the light-transmitting cover may be smaller than the refractive index of the second light-transmitting resin layer.

[0189] The above front layer may include a circuit pattern layer provided on the front surface of the light-transmitting substrate and electrically connected to the plurality of light-emitting elements.

[0190] The above filler may include a first color material having black and a second color material having a color different from black.

[0191] The first color material above may include carbon black.

[0192] The apparatus may further include a base substrate that is light-transmitting and supports the plurality of transparent display modules, and a rear adhesive layer that is provided to attach the plurality of transparent display modules to the base substrate. The rear adhesive layer may include a first rear adhesive provided to be attached to the base substrate and a second rear adhesive provided to be attached to the plurality of transparent display modules. The adhesive strength of the second rear adhesive may be smaller than the adhesive strength of the first rear adhesive.

[0193] The transparent display device may further include a front optical layer that covers the front surface of the light-transmitting cover and is configured to allow light to pass through, and a front adhesive layer configured to attach the light-transmitting cover to the front optical layer. The front adhesive layer may include a first front adhesive configured to be attached to the light-transmitting cover and a second front adhesive configured to be attached to the front optical layer. The adhesive strength of the first front adhesive may be smaller than the adhesive strength of the second front adhesive.

[0194] The first light-transmitting resin layer may have the same color value as the second light-transmitting resin layer. The second light-transmitting resin layer may have the same refractive index as the first light-transmitting resin layer.

[0195] The light-transmitting cover may have a color value identical to the color value of the first light-transmitting resin layer and the color value of the second light-transmitting resin layer. The light-transmitting cover may have a refractive index identical to the refractive index of the second light-transmitting resin layer and the refractive index of the first light-transmitting resin layer.

[0196] The first light-transmitting resin layer, the second light-transmitting resin layer, and the light-transmitting cover can be formed integrally.

[0197] A transparent display device according to an exemplary embodiment of the present disclosure may include a base substrate configured to allow light to pass through, a plurality of transparent display modules arranged on the front surface of the base substrate, a filler disposed in a gap between the plurality of transparent display modules, and a light-transmitting cover comprising a first region covering the front surface of the plurality of transparent display modules and a second region covering the front surface of the filler. Each of the plurality of transparent display modules may include a light-transmitting substrate, a circuit pattern layer configured on the front surface of the light-transmitting substrate, a plurality of light-emitting elements mounted on the front surface of the light-transmitting substrate and electrically connected to the circuit pattern layer, and a front layer comprising a mounting surface cover that surrounds the front surface of the circuit pattern layer, the plurality of light-emitting elements, and the light-transmitting substrate and configured to allow light to pass through. The above filler may include a first light-transmitting resin layer disposed side-by-side with the light-transmitting substrate in the gap and having a refractive index matched with the refractive index of the light-transmitting substrate, and a second light-transmitting resin layer disposed side-by-side with the front layer in the gap and having a color value matched with the color value of the front layer. The transmittance of light passing sequentially through the light-transmitting substrate, the front layer, and the first region, and the transmittance of light passing sequentially through the first light-transmitting resin layer, the second light-transmitting resin layer, and the second region may be matched with each other.

[0198] The difference between the transmittance of light passing sequentially through the light-transmitting substrate, the front layer, and the first region, and the transmittance of light passing sequentially through the first light-transmitting resin layer, the second light-transmitting resin layer, and the second region, may be 0.05 or less.

[0199] The rigidity of the light-transmitting cover may be higher than the rigidity of the first light-transmitting resin layer and the second light-transmitting resin layer.

[0200] The above filler may include a first color material having black and a second color material having a color different from black.

[0201] A transparent display device according to an exemplary embodiment of the present disclosure may include a base substrate that is configured to allow light to pass through, a plurality of transparent display modules mounted on the front surface of the base substrate, and a light-transmitting resin that is configured to allow light to pass through. Each of the plurality of transparent display modules may include a light-transmitting substrate and a front layer disposed on the front surface of the light-transmitting substrate, comprising a circuit pattern layer provided on the front surface of the light-transmitting substrate, a plurality of light-emitting elements mounted on the front surface of the light-transmitting substrate and electrically connected to the circuit pattern layer, and a mounting surface cover that surrounds the front surface of the circuit pattern layer, the plurality of light-emitting elements, and the light-transmitting substrate and is configured to allow light to pass through. A first portion of the light-transmitting resin may fill a gap between the plurality of transparent display modules. A second portion of the light-transmitting resin may cover the front surface of the plurality of transparent display modules. The refractive index of the light-transmitting resin may be matched with the refractive index of the light-transmitting substrate. The color value of the light-transmitting resin may be matched with the color value of the front layer. The transmittance of light passing sequentially through the base substrate, the light-transmitting substrate, the front layer, and the second portion of the light-transmitting resin, and the transmittance of light passing sequentially through the base substrate and the first portion of the light-transmitting resin can be matched with each other.

[0202] According to the present disclosure, the refractive index of a light-transmitting resin placed in the gap between a plurality of transparent display modules can be matched with the light-transmitting substrate of the transparent display module to reduce the visibility of the gap.

[0203] According to the present disclosure, the color value of a light-transmitting resin placed in the gap between a plurality of transparent display modules can be matched with the front layer of the transparent display module to reduce the visibility of the gap.

[0204] According to the present disclosure, the visibility of the gap can be reduced by matching the light transmittance that transmits the area corresponding to the gap between transparent display modules with the light transmittance that transmits the area corresponding to the transparent display module.

[0205] According to the present disclosure, the rigidity of the light-transmitting resin can be appropriately set to prevent the light-transmitting resin placed in the gap from being damaged.

[0206] According to the present disclosure, the rear adhesive layer has low adhesive strength of the layer attached to the transparent display module, so the transparent display module can be easily separated from the base substrate when necessary.

[0207] According to the present disclosure, the front adhesive layer has low adhesive strength to the layer that is adhered to the light-transmitting cover, so the front optical layer can be easily separated from the light-transmitting cover when necessary.

[0208] The effects according to the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below.

[0209] Although the present disclosure has been illustrated and described with reference to various exemplary embodiments, it will be understood that the various exemplary embodiments are intended to be illustrative and not limiting. It will be understood by those skilled in the art that various modifications, alternatives, and / or variations of the various exemplary embodiments may be made without departing from the true technical spirit and the entire technical scope of the present disclosure, including the appended claims and their equivalents. Furthermore, it will be understood that any embodiment described herein may be used in conjunction with any other embodiment described herein.

Claims

1. A plurality of transparent display modules, each including a display and arranged in an M*N matrix form; A filler disposed in the gap between the plurality of transparent display modules; and A light-transmitting cover configured to cover the front of the plurality of transparent display modules and the front of the filler; comprising Each of the above plurality of transparent display modules is, A light-transmitting substrate; and A front layer disposed in front of the light-transmitting substrate, comprising a plurality of light-emitting elements including a light-emitting circuit mounted on the front surface of the light-transmitting substrate and configured to emit light forward, and a mounting surface cover that surrounds the plurality of light-emitting elements and the front surface of the light-transmitting substrate and is provided to allow light to pass through; The above filler is, A first light-transmitting resin layer disposed side-by-side with the light-transmitting substrate in the gap between the light-transmitting substrates of adjacent transparent display modules among the plurality of transparent display modules, and having a refractive index matched with the refractive index of the light-transmitting substrate; and A transparent display device comprising: a second light-transmitting resin layer disposed side-by-side with the front layer in the gap between the front layers of adjacent transparent display modules among the plurality of transparent display modules, and having a color value matched with the color value of the front layer.

2. In Paragraph 1, The above light-transmitting cover is, A first area configured to cover the front of the plurality of transparent display modules; and A second region configured to cover the front of the above-mentioned filler; comprising, A transparent display device in which the transmittance of light passing sequentially through the light-transmitting substrate, the front layer, and the first region, and the transmittance of light passing sequentially through the first light-transmitting resin layer, the second light-transmitting resin layer, and the second region are matched with each other.

3. In Paragraph 2, A transparent display device in which the difference between the transmittance of light passing sequentially through the light-transmitting substrate, the front layer, and the first region, and the transmittance of light passing sequentially through the first light-transmitting resin layer, the second light-transmitting resin layer, and the second region is 0.05 or less.

4. In Paragraph 1, A transparent display device in which the difference between the refractive index of the light-transmitting substrate and the refractive index of the first light-transmitting resin layer is 0.03 or less.

5. In Paragraph 1, A transparent display device in which the difference between the color value according to the yellow index of the front layer and the color value according to the yellow index of the second light-transmitting resin layer is 5 or less.

6. In Paragraph 1, A transparent display device in which the refractive index of the second light-transmitting resin layer and the refractive index of the front layer are matched to each other.

7. In Paragraph 1, A transparent display device in which the refractive index of the light-transmitting cover is smaller than the refractive index of the second light-transmitting resin layer.

8. In Paragraph 1, The above front layer is, A transparent display device comprising a circuit pattern layer provided on the front surface of the light-transmitting substrate and electrically connected to the plurality of light-emitting elements.

9. In Paragraph 1, The above filler is a transparent display device comprising a first color material having black and a second color material having a color different from black.

10. In Paragraph 9, The above first color material is a transparent display device including carbon black.

11. In Paragraph 1, A base substrate that is light-transmitting and supports the plurality of transparent display modules; and It further includes a rear adhesive layer provided to attach the plurality of transparent display modules to the base substrate. The above rear adhesive layer is, A first rear adhesive provided to be attached to the base substrate; and A second rear adhesive provided to be attached to the plurality of transparent display modules; comprising A transparent display device in which the adhesive strength of the second rear adhesive is smaller than the adhesive strength of the first rear adhesive.

12. In Paragraph 1, A front optical layer that covers the front of the light-transmitting cover and is configured to allow light to pass through; and It further includes a front adhesive layer provided to attach the light-transmitting cover to the front optical layer, and The above front adhesive layer is, A first front adhesive provided to be attached to the light-transmitting cover; and A second front adhesive provided to be attached to the front optical layer; comprising A transparent display device in which the adhesive strength of the first front adhesive is smaller than the adhesive strength of the second front adhesive.

13. In Paragraph 1, The first light-transmitting resin layer has the same color value as the second light-transmitting resin layer, A transparent display device in which the second light-transmitting resin layer has the same refractive index as the first light-transmitting resin layer.

14. In Paragraph 13, The light-transmitting cover has a color value identical to the color value of the first light-transmitting resin layer and the color value of the second light-transmitting resin layer, The light-transmitting cover is a transparent display device having the same refractive index as the second light-transmitting resin layer and the first light-transmitting resin layer.

15. In Paragraph 1, A transparent display device in which the first light-transmitting resin layer, the second light-transmitting resin layer, and the light-transmitting cover are integrally formed.

Images