Double-sided transparent display device
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SAMSUNG ELECTRONICS CO LTD
- Filing Date
- 2026-01-29
- Publication Date
- 2026-08-06
Smart Images
Figure KR2026001753_06082026_PF_FP_ABST
Abstract
Description
Double-sided transparent display device
[0001] The present disclosure relates to a double-sided transparent display device capable of displaying images on the front and back sides.
[0002] With the advancement of electronic technology, various types of flat panel display devices are being developed and used.
[0003] Flat panel display devices include Liquid Crystal Displays, Field Emission Displays, Plasma Displays, Organic Light Emitting Diode (OLED) displays, and Micro LED displays.
[0004] Organic light-emitting diode (OLED) display devices and micro-LED display devices are self-emissive devices that have the advantages of faster response speed, higher luminous efficiency, brightness, and viewing angle compared to other flat panel display devices.
[0005] Recently, organic light-emitting diode display devices and micro light-emitting diode display devices are being developed as transparent display devices.
[0006] A double-sided transparent display device according to one or more embodiments of the present disclosure may include: a transparent substrate; and a plurality of transparent pixels arranged in a grid shape on a first surface of the transparent substrate. Each of the plurality of transparent pixels may include: a rectangular opening; a front light-emitting part provided on one side of the opening and formed to emit light toward the front of the first surface of the transparent substrate; a rear light-emitting part provided adjacent to the front light-emitting part on one side of the opening where the front light-emitting part is formed and formed to emit light toward the rear opposite to the front; and a non-transparent electrode disposed on the uppermost layer of the rear light-emitting part.
[0007] According to one or more embodiments of the present disclosure, the forward light-emitting part may be formed of a micro LED.
[0008] According to one or more embodiments of the present disclosure, the rear light-emitting part may be formed as any one of an RGB OLED, a White OLED, or a blue OLED.
[0009] According to one or more embodiments of the present disclosure, a first low-reflection film disposed to cover the plurality of transparent pixels; and a second low-reflection film disposed to cover the second surface of the transparent substrate opposite to the first surface of the transparent substrate on which the plurality of transparent pixels are installed.
[0010] According to one or more embodiments of the present disclosure, the first low-reflection film and the second low-reflection film may each comprise a substrate having a high refractive index; and a low-reflection layer formed on one surface of the substrate.
[0011] According to one or more embodiments of the present disclosure, the refractive index of the above-described material may be 1.65 or higher.
[0012] According to one or more embodiments of the present disclosure, a passivation layer may be disposed between the plurality of transparent pixels and the first low-reflection film.
[0013] According to one or more embodiments of the present disclosure, an additional transparent substrate disposed above the plurality of transparent pixels may be further included.
[0014] According to one or more embodiments of the present disclosure, a double-sided transparent display device may further include: a first low-reflection film disposed to cover the additional transparent substrate; and a second low-reflection film disposed to cover the second surface of the transparent substrate opposite to the first surface of the transparent substrate on which the plurality of transparent pixels are installed.
[0015] A double-sided transparent display device according to one or more embodiments of the present disclosure may include: a transparent substrate; and a plurality of light-emitting units disposed at regular intervals on a first surface of the transparent substrate. Each of the plurality of light-emitting units may include: a front light-emitting unit formed to emit light toward the front of the first surface of the transparent substrate; a rear light-emitting unit disposed in a straight line with the front light-emitting unit and formed to emit light toward the rear of the transparent substrate; and a non-transparent electrode disposed on the uppermost layer of the rear light-emitting unit. External light may pass through the portion of the transparent substrate between the plurality of light-emitting units.
[0016] According to one or more embodiments of the present disclosure, the transparent substrate may not be exposed between the front light-emitting part and the rear light-emitting part.
[0017] According to one or more embodiments of the present disclosure, a double-sided transparent display device may further include: a first low-reflection film disposed to cover the first surface of the transparent substrate and the plurality of light-emitting parts; and a second low-reflection film disposed to cover the second surface of the transparent substrate opposite to the first surface of the transparent substrate on which the plurality of light-emitting parts are installed.
[0018] The above-described or other aspects, features, and benefits of embodiments of the present disclosure will become more apparent from the following description with reference to the accompanying drawings. In the accompanying drawings:
[0019] FIG. 1 is a perspective view showing a double-sided transparent display device according to one or more embodiments of the present disclosure.
[0020] FIG. 2 is a block diagram showing a double-sided transparent display device according to one or more embodiments of the present disclosure.
[0021] FIG. 3 is a drawing showing a plurality of transparent pixels of a double-sided transparent display device according to one or more embodiments of the present disclosure.
[0022] FIG. 4 is a cross-sectional view showing a transparent pixel of a double-sided transparent display device according to one or more embodiments of the present disclosure of FIG. 3 by cutting along line AA.
[0023] FIG. 5 is a cross-sectional view showing a transparent pixel of a double-sided transparent display device according to one or more embodiments of the present disclosure of FIG. 3 by cutting along a line BB.
[0024] FIG. 6 is a cross-sectional view showing a transparent pixel of a double-sided transparent display device according to one or more embodiments of the present disclosure of FIG. 3, cut along line CC.
[0025] FIG. 7 is a cross-sectional view showing a double-sided transparent display device according to one or more embodiments of the present disclosure.
[0026] FIG. 8 is a cross-sectional view showing a double-sided transparent display device according to one or more embodiments of the present disclosure.
[0027] FIG. 9 is a cross-sectional view showing a white OLED and a color filter used as a rear light-emitting part of a double-sided transparent display device according to one or more embodiments of the present disclosure.
[0028] FIG. 10 is a cross-sectional view showing a blue OLED and a color filter used as a rear light-emitting part of a double-sided transparent display device according to one or more embodiments of the present disclosure.
[0029] The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or alternatives of said embodiments.
[0030] In relation to the description of the drawings, similar reference numerals may be used for similar or related components.
[0031] The singular form of the noun corresponding to the item may include one or multiple items, unless the relevant context clearly indicates otherwise.
[0032] In this document, each of the phrases such as "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "at least one of A, B, or C" may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof.
[0033] The term "and / or" includes a combination of multiple related described components or any of the multiple related described components.
[0034] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish a component from another component and do not limit the components in other aspects (e.g., importance or order).
[0035] Where any (e.g., 1st) component is referred to as "coupled" or "connected" to another (e.g., 2nd) component, with or without the terms "functionally" or "communicationly," it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.
[0036] Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in this document, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.
[0037] When it is said that a component is "connected," "combined," "supported," or "in contact" with another component, this includes not only cases where the components are directly connected, combined, supported, or in contact, but also cases where they are indirectly connected, combined, supported, or in contact through a third component.
[0038] When it is said that a component is located "on" another component, this includes not only cases where one component is in contact with the other, but also cases where another component exists between the two components.
[0039] Additionally, terms such as 'front end', 'rear end', 'upper part', 'lower part', 'upper part', and 'lower part' used in this disclosure are defined based on the drawings, and the shape and position of each component are not limited by these terms.
[0040] The present disclosure aims to provide a double-sided transparent display device capable of displaying different images on the front and back sides, respectively.
[0041] FIG. 1 is a perspective view showing a double-sided transparent display device (1) according to one or more embodiments of the present disclosure.
[0042] The three-dimensional coordinate system of the XYZ axes shown in FIG. 1 is based on the double-sided transparent display device (1). For reference, in FIG. 1, the plane where the screen of the double-sided transparent display device (1) is located is the XZ plane, the direction in which the front image is output or light is emitted from the front light-emitting part (30) is the +Y direction, and the direction in which the rear image is output or light is emitted from the rear light-emitting part (40) is the -Y direction.
[0043] Referring to FIG. 1, a double-sided transparent display device (1) according to one or more embodiments of the present disclosure may be formed to display images in the front (+Y direction) and rear (-Y direction) of the double-sided transparent display device (1). The double-sided transparent display device (1) may be formed to display a front image on the front (1a) and a rear image separately from the front image on the rear (1b). The front image and the rear image may be the same image or different images. Here, the front image and the rear image may include still images and / or video images.
[0044] For example, the front (1a) and rear (1b) of the double-sided transparent display device (1) can display various images such as broadcast content, multimedia content, etc. Additionally, the front (1a) and rear (1b) of the double-sided transparent display device (1) can display a user interface and icons.
[0045] According to one embodiment, since the double-sided transparent display device (1) according to one or more embodiments of the present disclosure is formed to be transparent, a user can view an object located at the rear (-Y direction) of the double-sided transparent display device (1) through the double-sided transparent display device (1) from the front (+Y direction) of the double-sided transparent display device (1). Additionally, a user can view an object located at the front (+Y direction) of the double-sided transparent display device (1) through the double-sided transparent display device (1) from the rear (-Y direction) of the double-sided transparent display device (1).
[0046] According to one embodiment, a double-sided transparent display device (1) according to one or more embodiments of the present disclosure may include a transparent substrate (10) and a plurality of transparent pixels (20).
[0047] The transparent substrate (10) may be formed in a flat plate shape. The transparent substrate (10) may be formed from a transparent material. The transparent substrate (10) may have a transparency capable of transmitting external light. For example, the transparent substrate (10) may be formed from a glass substrate. According to one embodiment, the transparent substrate (10) may be formed as a rectangular flat plate or a curved plate.
[0048] A plurality of transparent pixels (20) may be arranged in a grid shape on a transparent substrate (10). A single transparent pixel (20) may include an opening (21), a front light-emitting part (30) that emits light toward the front (+Y direction) of the double-sided transparent display device (1), and a rear light-emitting part (40) that emits light toward the rear (-Y direction) of the double-sided transparent display device (1).
[0049] FIG. 2 is a block diagram showing a double-sided transparent display device (1) according to one or more embodiments of the present disclosure.
[0050] Referring to FIG. 2, a double-sided transparent display device (1) according to one or more embodiments of the present disclosure may include a processor (100), a front display module (101), a front driver IC (102), a rear display module (103), and a rear driver IC (104).
[0051] The processor (100) may be implemented as a digital signal processor (DSP) that processes digital video signals, a microprocessor, a graphics processing unit (GPU), an artificial intelligence (AI) processor, a neural processing unit (NPU), or a time controller (TCON). The processor (100) is not limited thereto and may include or be defined by one or more of a central processing unit (CPU), a micro controller unit (MCU), a micro processing unit (MPU), a controller, an application processor (AP), a communication processor (CP), or an ARM processor. The processor (100) may be implemented as a system on chip (SoC) or large scale integration (LSI) with a built-in processing algorithm, or may be implemented in the form of an application-specific integrated circuit (ASIC) or field programmable gate array (FPGA).
[0052] The processor (100) can control hardware or software components connected to the processor (100) by running an operating system or application, and can perform various data processing and operations. In addition, the processor (100) can load instructions or data received from at least one of the other components into volatile memory for processing, and store various data in non-volatile memory.
[0053] The processor (100) can control the front display module (101) to display a front image on the front of the double-sided transparent display device (1). The processor (100) can control the rear display module (103) to display a rear image on the rear of the double-sided transparent display device (1).
[0054] The front display module (101) may include a front light-emitting unit (30) (see FIG. 3) of a plurality of transparent pixels (20) (see FIG. 3) arranged in a grid shape on a transparent substrate (10) (see FIG. 3). The front light-emitting unit (30) may include a front circuit board (31) (see FIG. 4) and a plurality of front sub-pixels (32) (see FIG. 4). According to one embodiment, the front light-emitting unit (30) may be formed of an inorganic light-emitting element. For example, the front light-emitting unit (30) may be formed of a micro LED.
[0055] The front driver IC (driver integrated circuit) (102) can be formed to control the front display module (101).
[0056] The forward driver IC (102) can communicate with the processor (100) through the interface module (1021). Additionally, the forward driver IC (102) can store at least a portion of the received image information in memory (1022), for example, in frame units. The image processing module (1023) can perform preprocessing or postprocessing (e.g., resolution, brightness, or size adjustment) on at least a portion of the image data based on the characteristics of the image data or the characteristics of the forward display module (101), for example. The mapping module (1024) can generate voltage or current values corresponding to the image data preprocessed or postprocessed through the image processing module (1023). According to one embodiment, the generation of a voltage value or a current value may be performed, for example, based on at least some of the attributes of the front display module (101) (e.g., an array of pixels (RGB stripe or pentile structure) or the size of each of the subpixels. At least some of the pixels of the front display module (101) are driven, for example, based at least some of the voltage value or current value, so that visual information (e.g., text, image, or icon) corresponding to the image data can be displayed through a plurality of front light-emitting units (30).
[0057] The front driver IC (102) can transmit a driving signal (e.g., driver driving signal, gate driving signal, etc.) to the front display module (101) based on the front image information received from the processor (100).
[0058] The front driver IC (102) can display a front image based on a front image signal received from the processor (100). For example, the front driver IC (102) can display a front image by generating a driving signal for a plurality of subpixels of the front display module (101) based on the front image signal received from the processor (100) and controlling the light emission of the plurality of subpixels based on the driving signal.
[0059] The forward driver IC (102) may include an interface module (1021), a memory (1022) (e.g., buffer memory), an image processing module (1023), or a mapping module (1024). The forward driver IC (102) may receive forward image information, including, for example, image data or an image control signal corresponding to a command for controlling image data, from another component of the double-sided transparent display device (1) through the interface module (1021). For example, according to one embodiment, the forward image information may be received from a processor (100) (e.g., a main processor (e.g., an application processor) or an auxiliary processor (e.g., a graphics processing unit) that operates independently of the functions of the main processor).
[0060] The rear display module (103) may include a rear light-emitting part (40) (see FIG. 3) of a plurality of transparent pixels (20) (see FIG. 3) arranged in a grid shape on a transparent substrate (10) (see FIG. 3). The rear light-emitting part (40) may include a rear circuit board (41) (see FIG. 4) and a plurality of rear sub-pixels (42) (see FIG. 4). According to one embodiment, the rear light-emitting part (40) may be formed as an organic light-emitting element. For example, the rear light-emitting part (40) may be formed as one of an RGB OLED, a white OLED (92), and a blue OLED (93).
[0061] The rear driver IC (104) can be configured to control the rear display module (103).
[0062] The rear driver IC (104) can communicate with the processor (100) through the interface module (1041). Since the rear driver IC (104) can be formed identically or similarly to the forward driver IC (102) described above, a redundant description is omitted.
[0063] The rear driver IC (104) can transmit a driving signal (e.g., driver driving signal, gate driving signal, etc.) to the rear display module (103) based on rear image information received from the processor (100).
[0064] The rear driver IC (104) can display a rear image based on a rear image signal received from the processor (100). For example, the rear driver IC (104) can display a rear image by generating a driving signal for a plurality of rear subpixels of the rear display module (103) based on the rear image signal received from the processor (100) and controlling the light emission of the plurality of rear subpixels based on the driving signal.
[0065] The rear driver IC (104) may include an interface module (1041), a memory (1042) (e.g., buffer memory), an image processing module (1043), or a mapping module (1044). The rear driver IC (104) may receive rear image information, including, for example, image data or an image control signal corresponding to a command for controlling image data, from another component of the double-sided transparent display device (1) through the interface module (1041). For example, according to one embodiment, the rear image information may be received from a processor (100) (e.g., a main processor (e.g., an application processor) or an auxiliary processor (e.g., a graphics processing unit) that operates independently of the functions of the main processor).
[0066] A double-sided transparent display device (1) according to one or more embodiments of the present disclosure may further include an input unit (105), a communication unit (106), and a source input unit (107).
[0067] The input unit (105) may be formed to receive commands from a user to control the double-sided transparent display device (1). The input unit (105) may include a button or a touch pad provided in one area of the double-sided transparent display device (1). For example, it may be implemented as a touch screen on the front (10a) and rear (10b) of the double-sided transparent display device (1). According to one embodiment, the input unit (105) may include a remote controller.
[0068] The input unit (105) can receive various commands from the user to control the double-sided transparent display device (1), such as turning the power on / off, adjusting the volume, adjusting the channel, adjusting the screen, and changing various settings.
[0069] The communication unit (106) can communicate with a relay server or other electronic device to exchange necessary data. The communication unit (106) may adopt at least one of various wireless communication methods such as 3G (3rd Generation), 4G (4th Generation), Wireless LAN, Wi-Fi, Bluetooth, Zigbee, WFD (Wi-Fi Direct), UWB (Ultra wideband), Infrared Data Association (IrDA), BLE (Bluetooth Low Energy), NFC (Near Field Communication), and Z-Wave. Additionally, the communication unit (106) may adopt wired communication methods such as PCI (Peripheral Component Interconnect), PCI-express, and USB (Universe Serial Bus).
[0070] The source input unit (107) can receive a source signal input from a set-top box, USB, antenna, etc. Accordingly, the source input unit (107) may include at least one selected from a group of source input interfaces including an HDMI cable port, a USB port, an antenna, etc.
[0071] The source signal received by the source input unit (107) can be processed by the processor (100) and converted into a form that can be output by the front display module (101) and the rear display module (103).
[0072] Hereinafter, a transparent pixel (20) of a double-sided transparent display device (1) according to one or more embodiments of the present disclosure will be described in detail with reference to FIGS. 3 to 6.
[0073] FIG. 3 is a drawing showing a plurality of transparent pixels (20) of a double-sided transparent display device (1) according to one or more embodiments of the present disclosure. FIG. 4 is a cross-sectional view showing a transparent pixel (20) of a double-sided transparent display device (1) according to one or more embodiments of the present disclosure of FIG. 3 by cutting along line AA. FIG. 5 is a cross-sectional view showing a transparent pixel (20) of a double-sided transparent display device (1) according to one or more embodiments of the present disclosure of FIG. 3 by cutting along line BB. FIG. 6 is a cross-sectional view showing a transparent pixel (20) of a double-sided transparent display device (1) according to one or more embodiments of the present disclosure of FIG. 4 by cutting along line CC.
[0074] Referring to FIGS. 3 to 6, a double-sided transparent display device (1) according to one or more embodiments of the present disclosure may include a transparent substrate (10) and a plurality of transparent pixels (20).
[0075] The transparent substrate (10) can be formed in a flat shape. The transparent substrate (10) can be formed from a transparent material. The transparent substrate (10) can have transparency capable of transmitting external light. For example, the transparent substrate (10) can be formed from a flat glass substrate.
[0076] A transparent substrate (10) may include a first surface (10a) (+Y direction) on which a plurality of transparent pixels (20) are arranged, and a second surface (10b) facing in the opposite direction to the first surface (10a) (e.g., -Y direction). For example, the first surface (10a) of the transparent substrate (10) may face the front (+Y direction) of the double-sided transparent display device (1), and the second surface (10b) may face the rear (-Y direction) of the double-sided transparent display device (1).
[0077] A plurality of transparent pixels (20) may be formed on a first surface (10a) of a transparent substrate (10). For example, a plurality of transparent pixels (20) may be arranged in a grid shape on the first surface (10a) of the transparent substrate (10).
[0078] A wiring pattern (23) for supplying control signals, power, etc. may be provided on the first surface (10a) of the transparent substrate (10). The wiring pattern (23) may be formed between a plurality of transparent pixels (20). The wiring pattern (23) may be formed in a grid shape on the first surface (10a) of the transparent substrate (10).
[0079] Each of the plurality of transparent pixels (20) may include an opening (21), a front light-emitting part (30), and a rear light-emitting part (40).
[0080] The opening (21) can be formed by a wiring pattern (23). The opening (21) can be formed in a rectangular shape. The opening (21) can be formed as a transparent area through which external light can pass. On the transparent substrate (10), all areas except for the wiring pattern (23) can be transparent.
[0081] The area of the opening (21) may be 70% or more of the area of the transparent pixel (20). For example, the area of the opening (21) may be about 70% to about 95% of the area of the transparent pixel (20).
[0082] The opening (21) may include a first side (21a), a second side (21b) positioned perpendicular to the first side (21a), a third side (21c) positioned perpendicular to the second side (21b) and parallel to the first side (21a), and a fourth side (21d) positioned perpendicular to the third side (21c) and parallel to the second side (21b).
[0083] A front light-emitting unit (30) is provided on one side of an opening (21) and can be formed to emit light toward the front (+Y direction) of a transparent substrate (10). For example, the front light-emitting unit (30) can be placed on a wiring pattern (23) adjacent to the first side (21a) of the opening (21). The front light-emitting unit (30) can be formed to display a color image.
[0084] For example, a plurality of front light-emitting parts (30) may be spaced apart in the X direction by the width of the opening (21). In other words, the opening (21) may be positioned between two front light-emitting parts (30).
[0085] According to one embodiment, the front light-emitting unit (30) may include a plurality of front subpixels (32) and a front circuit board (31) on which the plurality of front subpixels (32) are arranged.
[0086] A plurality of front subpixels (32) may be formed as inorganic light-emitting elements. For example, the front subpixels (32) may include a red subpixel (321) formed to emit red light, a green subpixel (322) formed to emit green light, and a blue subpixel (323) formed to emit blue light.
[0087] According to one embodiment, a plurality of front subpixels (32) may be formed of micro LEDs (light emitting diodes).
[0088] A front circuit board (31) may be provided below a plurality of front subpixels (32). The front circuit board (31) may be placed below a red subpixel (321), a green subpixel (322), and a blue subpixel (323). The front circuit board (31) may be formed to supply power to a plurality of front subpixels (32). The front circuit board (31) may be formed to control a plurality of front subpixels (32). For example, the front circuit board (31) may be formed to supply power to and control a red micro LED, a green micro LED, and a blue micro LED.
[0089] The front circuit board (31) can be controlled by the front driver IC (102). Accordingly, the multiple front light-emitting parts (30) of the multiple transparent pixels (20) can be controlled by the front driver IC (102). The front driver IC (102) can control the multiple front light-emitting parts (30) to display a front image on the front (1a) of the double-sided transparent display device (1).
[0090] The rear light-emitting part (40) may be positioned adjacent to the front light-emitting part (30) on one side of the opening (21) where the front light-emitting part (30) is formed. The rear light-emitting part (40) may be formed to emit light in the rear (-Y direction), which is opposite to the front (+Y direction) of the transparent substrate (10). For example, the rear light-emitting part (40) may be positioned adjacent to the front light-emitting part (30) on a wiring pattern (23) adjacent to the first side (21a) of the opening (21). In other words, the rear light-emitting part (40) may be positioned in a straight line with the front light-emitting part (30). The rear light-emitting part (40) may be formed to display a color image.
[0091] For example, a plurality of rear light-emitting parts (40) may be spaced apart in the X direction by the width of the opening (21). In other words, the opening (21) may be positioned between two rear light-emitting parts (40).
[0092] According to one embodiment, the front light-emitting part (30) and the rear light-emitting part (40) can form a light-emitting part. Accordingly, a double-sided transparent display device (1) according to one or more embodiments of the present disclosure may include a transparent substrate (10) and a plurality of light-emitting parts (30, 40). The plurality of light-emitting parts (30, 40) may be arranged at regular intervals in one direction (X direction) on a first surface (10a) of the transparent substrate (10).
[0093] The portion of the transparent substrate (10) between the plurality of light-emitting parts (30, 40) can form an opening (21). Thus, external light can pass between the plurality of light-emitting parts (30, 40).
[0094] The light-emitting portions (30, 40) can be placed on the wiring pattern (23). The wiring pattern (23) may exist between the front light-emitting portion (30) and the rear light-emitting portion (40). Therefore, the transparent substrate (10) may not be exposed between the front light-emitting portion (30) and the rear light-emitting portion (40).
[0095] According to one embodiment, the rear light-emitting unit (40) may include a plurality of rear subpixels (42) and a rear circuit board (41).
[0096] Each of the plurality of rear subpixels (42) can be formed as an organic light-emitting diode. For example, the organic light-emitting diode can be formed as an RGB OLED (red-green-blue organic light emitting diode).
[0097] The organic light-emitting device may include an organic light-emitting layer (43), a transparent electrode (44), and a non-transparent electrode (45).
[0098] The organic light-emitting layer (43) may be formed to emit red light, green light, and blue light. In other words, a plurality of rear subpixels (42) may include a red OLED (421) formed to emit red light, a green OLED (422) formed to emit green light, and a blue OLED (423) formed to emit blue light.
[0099] A transparent electrode (44) can be placed below (-Y direction) the organic light-emitting layer (43). The transparent electrode (44) can be formed so that light generated from the organic light-emitting layer (43) is transmitted. Thus, light generated from the organic light-emitting layer (43) can pass through the transparent electrode (44) and be emitted in the downward direction (-Y direction).
[0100] The non-transparent electrode (45) may be placed on the uppermost layer of the rear light-emitting part (40). For example, the non-transparent electrode (45) may be placed above (+Y direction) the organic light-emitting layer (43) forming the rear light-emitting part (40). The non-transparent electrode (45) may be formed to reflect light generated from the organic light-emitting layer (43). In other words, the non-transparent electrode (45) may function as a reflective electrode that reflects light emitted upward (+Y direction) from the light generated from the organic light-emitting layer (43) toward the transparent electrode (44). Thus, the light generated from the organic light-emitting layer (43) may not be emitted upward (+Y direction) but may be emitted downward (-Y direction).
[0101] The transparent electrode (44) and the non-transparent electrode (45) can form a positive electrode and a negative electrode. For example, the transparent electrode (44) can be used as the positive electrode and the non-transparent electrode (45) as the negative electrode. Alternatively, the transparent electrode (44) can be used as the negative electrode and the non-transparent electrode (45) as the positive electrode.
[0102] The rear circuit board (41) may be formed to generate light by controlling a plurality of rear subpixels (42). The rear circuit board (41) may be formed on the first surface (10a) of the transparent substrate (10). The rear circuit board (41) may be electrically connected to a transparent electrode (44) and a non-transparent electrode (45). For example, the rear circuit board (41) may generate light by controlling an organic light-emitting element that forms the rear subpixels (42).
[0103] The rear circuit board (41) can be controlled by a rear driver IC (104). Accordingly, a plurality of rear light-emitting parts (40) of a plurality of transparent pixels (20) can be controlled by the rear driver IC (104). The rear driver IC (104) can control a plurality of rear light-emitting parts (40) to display a rear image on the rear side (1b) of the double-sided transparent display device (1). Accordingly, the double-sided transparent display device (1) according to one or more embodiments of the present disclosure can display different images on the front side (1a) and the rear side (1b), respectively. Alternatively, the double-sided transparent display device (1) according to one or more embodiments of the present disclosure can display the same image on the front side (1a) and the rear side (1b).
[0104] A passivation layer (70) may be formed on the upper side of the front light-emitting part (30) and the rear light-emitting part (40). The passivation layer (70) may be formed to cover the front light-emitting part (30) and the rear light-emitting part (40). The upper surface (+Y direction) of the passivation layer (70) may be formed as a flat surface.
[0105] A double-sided transparent display device (1) according to one or more embodiments of the present disclosure may further include a first low-reflection film (50) and a second low-reflection film (60).
[0106] The first low-reflection film (50) may be positioned to cover a plurality of transparent pixels (20). In other words, the first low-reflection film (50) may be positioned to cover a plurality of transparent pixels (20) positioned on the first surface (10a) of the transparent substrate (10). When a passivation layer (70) is formed on the upper side of the plurality of transparent pixels (20), the first low-reflection film (50) may be positioned on the upper surface (+Y direction) of the passivation layer (70). The first low-reflection film (50) may be formed to cover all of the plurality of transparent pixels (20) formed on the first surface (10a) of the transparent substrate (10).
[0107] The first low-reflection film (50) is transparent and can be formed to have a low reflectance and a high refractive index. For example, the first low-reflection film (50) can have a reflectance of about 1% or less and a refractive index of 1.65 or more.
[0108] The first low-reflection film (50) may include a substrate (51) and a low-reflection layer (52) formed on one surface of the substrate (51).
[0109] The substrate (51) can form the base of the first low-reflection film (50). The substrate (51) can be placed on the upper side (+Y direction) of a plurality of transparent pixels (20).
[0110] The substrate (51) can be formed as a transparent film. For example, the substrate (51) can be formed as a triacetylcellulose (TAC) film (hereinafter referred to as a TAC film).
[0111] The substrate (51) may be formed to have a high refractive index. For example, the refractive index of the substrate (51) may be 1.65 or higher. When the refractive index of the substrate (51) is 1.65 or higher, light generated from the front light-emitting part (30) of a plurality of transparent pixels (20) may be refracted and concentrated toward the front (+Y direction) of the first low-reflection film (50). Accordingly, among the light generated from the front light-emitting part (30) of a plurality of transparent pixels (20), the proportion of light reflected by the first low-reflection film (50) and emitted toward the rear (-Y direction) of the double-sided transparent display device (1) may be reduced. Accordingly, when the refractive index of the substrate (51) is 1.65 or higher, the amount of light emitted toward the front (1a) of the double-sided transparent display device (1) may be increased.
[0112] When the refractive index of the substrate (51) is less than 1.65, the ratio of light generated from the front light-emitting part (30) of a plurality of transparent pixels (20) that is reflected by the first low-reflection film (50) and emitted to the rear (-Y direction) of the double-sided transparent display device (1) may be greater than when the refractive index of the substrate (51) is 1.65 or higher. Accordingly, when the refractive index of the substrate (51) is less than 1.65, the amount of light emitted to the front (1a) of the double-sided transparent display device (1) may be less than when the refractive index of the substrate (51) is 1.65 or higher.
[0113] For example, the substrate (51) may have a thickness of about 30 μm to about 100 μm.
[0114] The low-reflection layer (52) is transparent and can be formed to minimize reflection of external light. According to one embodiment, the low-reflection layer (52) of the first low-reflection film (50) can be formed to minimize reflection of external light on the front surface (1a) of the double-sided transparent display device (1).
[0115] For example, the low-reflection layer (52) can be formed so that the SCI (specular component included) reflectance is 0.5% to 1%.
[0116] For example, the low-reflection layer (52) can be formed on the upper surface (+Y direction) of the substrate (51).
[0117] The low-reflection layer (52) may use a low-reflection film according to the prior art. For example, the low-reflection layer (52) may include an inorganic powder and a binder that combines the inorganic powder.
[0118] Inorganic powder can be formed in the form of particles. Inorganic powder may include hollow silica and silica nanoparticles. For example, the size of the hollow silica is 50 to 60 nm, and the size of the silica nanoparticles is 10 to 20 nm.
[0119] The low-reflection layer (52) can be formed in the form of a solution. The solution forming the low-reflection layer (52) can be called a low-reflection solution. The low-reflection layer (52) can be formed by coating the low-reflection solution on the upper surface (+Y direction) of the substrate (51).
[0120] For example, the anti-reflective layer (52) can be formed with a thickness of about 10 nm to 900 nm.
[0121] The second low-reflection film (60) may be positioned to cover the second surface (10b) of the transparent substrate (10). For example, the second low-reflection film (60) may be positioned to cover the second surface (10b) of the transparent substrate (10) opposite to the first surface (10a) of the transparent substrate (10) on which a plurality of transparent pixels (20) are installed. The second low-reflection film (60) may be positioned on the lower surface (-Y direction) of the transparent substrate (10). The second low-reflection film (60) may be formed to cover the entire second surface (10b) of the transparent substrate (10).
[0122] The second low-reflection film (60) is transparent and can be formed to have a low reflectance and a high refractive index. For example, the second low-reflection film (60) can have a reflectance of about 1% or less and a refractive index of 1.65 or more.
[0123] The second low-reflection film (60) may include a substrate (61) and a low-reflection layer (62) formed on one surface of the substrate (61).
[0124] The substrate (61) can be placed on the lower surface (-Y direction) of the transparent substrate (10). The low-reflection layer (62) can be placed on the lower surface (-Y direction) of the substrate (61).
[0125] Since the substrate (61) and the low-reflection layer (62) of the second low-reflection film (60) can be formed in the same way as the first low-reflection film (50), redundant descriptions are omitted.
[0126] When the refractive index of the substrate (61) is 1.65 or higher, light generated from the rear light-emitting part (40) of the plurality of transparent pixels (20) can be refracted and concentrated towards the rear (-Y direction) of the second low-reflection film (60). Accordingly, among the light generated from the rear light-emitting part (40) of the plurality of transparent pixels (20), the proportion of light reflected by the second low-reflection film (60) and emitted toward the front (+Y direction) of the double-sided transparent display device (1) can be reduced. Accordingly, when the refractive index of the substrate (61) is 1.65 or higher, the amount of light emitted toward the rear (1b) of the double-sided transparent display device (1) can be increased.
[0127] When the refractive index of the substrate (61) is less than 1.65, the ratio of light generated from the rear light-emitting part (40) of a plurality of transparent pixels (20) that is reflected by the second low-reflection film (60) and emitted toward the front (+Y direction) of the double-sided transparent display device (1) may be greater than when the refractive index of the substrate (61) is 1.65 or higher. Accordingly, when the refractive index of the substrate (61) is less than 1.65, the amount of light emitted toward the rear surface (1b) of the double-sided transparent display device (1) may be less than when the refractive index of the substrate (61) is 1.65 or higher.
[0128] The anti-reflection layer (62) of the second anti-reflection film (60) can be formed to minimize the reflection of external light on the rear surface (1b) of the double-sided transparent display device (1).
[0129] A double-sided transparent display device (1) according to one or more embodiments of the present disclosure as described above can implement a transparent display, and can display a front image using a plurality of micro LEDs on the front side (1a) and display a rear image using a plurality of OLEDs on the rear side (1b).
[0130] A double-sided transparent display device (1) according to one or more embodiments of the present disclosure having the above-described structure can be manufactured in the following way.
[0131] First, a front circuit board (31) and a rear circuit board (41) corresponding to a plurality of transparent pixels (20) can be formed on a first surface (10a) of a transparent substrate (10). The front circuit board (31) and the rear circuit board (41) can be formed as thin film transistors (TFTs). At this time, a grid-shaped wiring pattern (23) can be formed on the first surface (10a) of the transparent substrate (10).
[0132] Next, a plurality of front subpixels (32) can be formed on the upper surface (+Y direction) of the front circuit board (31). For example, a plurality of micro LEDs can be transferred on the upper surface (+Y direction) of the front circuit board (31).
[0133] Next, a plurality of rear subpixels (42) can be formed on the upper surface (+Y direction) of the rear circuit board (41). For example, a plurality of RGB OLEDs can be formed on the upper surface (+Y direction) of the rear circuit board (41).
[0134] Next, a passivation layer (70) can be formed on the upper side (+Y direction) of a plurality of transparent pixels (20).
[0135] Next, a first low-reflection film (50) can be placed on the upper side (+Y direction) of the passivation layer (70).
[0136] Finally, a second low-reflection film (60) can be placed on the second surface (10b) of the transparent substrate (10).
[0137] FIG. 7 is a cross-sectional view showing a double-sided transparent display device (1) according to one or more embodiments of the present disclosure.
[0138] Referring to FIG. 7, a double-sided transparent display device (1) according to one or more embodiments of the present disclosure may include a transparent substrate (10) and a plurality of transparent pixels (20).
[0139] A transparent substrate (10) may include a first surface (10a) (e.g., Y direction) on which a plurality of transparent pixels (20) are arranged, and a second surface (10b) facing in the opposite direction to the first surface (10a) (e.g., -Y direction). For example, the first surface (10a) of the transparent substrate (10) may face the front (+Y direction) of the double-sided transparent display device (1), and the second surface (10b) may face the rear (-Y direction) of the double-sided transparent display device (1).
[0140] A plurality of transparent pixels (20) may be formed on the second surface (10b) of the transparent substrate (10). For example, a plurality of transparent pixels (20) may be arranged in a grid shape on the second surface (10b) of the transparent substrate (10).
[0141] A wiring pattern (23) for supplying control signals, power, etc. may be provided on the second surface (10b) of the transparent substrate (10). The wiring pattern (23) may be formed between a plurality of transparent pixels (20). The wiring pattern (23) may be formed in a grid shape on the second surface (10b) of the transparent substrate (10).
[0142] Each of the plurality of transparent pixels (20) may include an opening (21), a front light-emitting part (30), and a rear light-emitting part (40).
[0143] The front light-emitting part (30) may include a reflective member (33) installed on the lower surface (-Y direction). The reflective member (33) may be formed to reflect light generated in the front light-emitting part (30). The reflective member (33) may reflect light generated in the front light-emitting part (30) so that the light is emitted toward the front (+Y direction) of the double-sided transparent display device (1).
[0144] In addition, the opening (21), the front light-emitting part (30), and the rear light-emitting part (40) of the transparent pixel (20) are identical to the transparent pixel (20) of the double-sided transparent display device (1) according to the above-described embodiment, so a redundant description is omitted.
[0145] FIG. 8 is a cross-sectional view showing a double-sided transparent display device (1) according to one or more embodiments of the present disclosure.
[0146] Referring to FIG. 8, a double-sided transparent display device (1) according to one or more embodiments of the present disclosure may include a transparent substrate (10), a plurality of transparent pixels (20), and an additional transparent substrate (80).
[0147] A transparent substrate (10) may include a first surface (10a) (e.g., Y direction) on which a plurality of transparent pixels (20) are arranged, and a second surface (10b) facing in the opposite direction to the first surface (10a) (e.g., -Y direction). For example, the first surface (10a) of the transparent substrate (10) may face the front (+Y direction) of the double-sided transparent display device (1), and the second surface (10b) may face the rear (-Y direction) of the double-sided transparent display device (1).
[0148] A plurality of transparent pixels (20) may be formed on a first surface (10a) of a transparent substrate (10). For example, a plurality of transparent pixels (20) may be arranged in a grid shape on the first surface (10a) of the transparent substrate (10).
[0149] A wiring pattern (23) for supplying control signals, power, etc. may be provided on the first surface (10a) of the transparent substrate (10). The wiring pattern (23) may be formed between a plurality of transparent pixels (20). The wiring pattern (23) may be formed in a grid shape on the first surface (10a) of the transparent substrate (10).
[0150] Each of the plurality of transparent pixels (20) may include an opening (21), a front light-emitting part (30), and a rear light-emitting part (40).
[0151] Since the plurality of transparent pixels (20) are identical to the plurality of transparent pixels (20) of the double-sided transparent display device (1) according to the above-described embodiment, a redundant description is omitted.
[0152] An additional transparent substrate (80) may be placed on the upper side (+Y direction) of a plurality of transparent pixels (20). According to one embodiment, the additional transparent substrate (80) may be placed on the upper surface (+Y direction) of a passivation layer (70) covering a plurality of transparent pixels (20).
[0153] The lower surface (80b) of the additional transparent substrate (80) may face a plurality of transparent pixels (20). According to one embodiment, the lower surface (80b) of the additional transparent substrate (80) may be adjacent to or in contact with the upper surface of the passivation layer (70). The upper surface (80a) of the additional transparent substrate (80) may face the front (+Y direction) of the double-sided transparent display device (1). For example, the upper surface (80a) of the additional transparent substrate (80) may face the front (+Y direction) of the double-sided transparent display device (1), and the lower surface (80b) may face the transparent substrate (10).
[0154] A double-sided transparent display device (1) according to one or more embodiments of the present disclosure may further include a first low-reflection film (50) and a second low-reflection film (60).
[0155] The first low-reflection film (50) may be placed on the upper surface (80a) of the additional transparent substrate (80). The first low-reflection film (50) may be placed to cover the additional transparent substrate (80). For example, the first low-reflection film (50) may be formed to cover the entire upper surface (80a) of the additional transparent substrate (80).
[0156] The second low-reflection film (60) may be positioned to cover the second surface (10b) of the transparent substrate (10). For example, the second low-reflection film (60) may be positioned to cover the second surface (10b) of the transparent substrate (10) opposite to the first surface (10a) of the transparent substrate (10) on which a plurality of transparent pixels (20) are installed. The second low-reflection film (60) may be positioned on the lower surface (-Y direction) of the transparent substrate (10). The second low-reflection film (60) may be formed to cover the entire second surface (10b) of the transparent substrate (10).
[0157] The first low-reflection film (50) and the second low-reflection film (60) are transparent and can be formed to have a low reflectance and a high refractive index. The first low-reflection film (50) and the second low-reflection film (60) may each include a substrate (51, 61) and a low-reflection layer (52, 62). Since the substrate (51, 61) and the low-reflection layer (52, 62) of the first low-reflection film (50) and the second low-reflection film (60) are identical to the first low-reflection film (50) and the second low-reflection film (60) of the double-sided transparent display device (1) according to the above-described embodiment, a redundant description is omitted.
[0158] In the above embodiments, an RGB OLED was used as the rear light-emitting part (40), but the rear light-emitting part (40) of the double-sided transparent display device (1) according to one or more embodiments of the present disclosure is not limited thereto. For example, a white OLED (92) or a blue OLED (93) and a color filter (90) may be used as the rear light-emitting part (40).
[0159] FIG. 9 is a cross-sectional view showing a white OLED (92) and a color filter (90) used as a rear light-emitting part (40) of a double-sided transparent display device (1) according to one or more embodiments of the present disclosure.
[0160] Referring to FIG. 9, the rear light-emitting part (40) of a double-sided transparent display device (1) according to one or more embodiments of the present disclosure may include a color filter (90) and a white OLED (92).
[0161] A color filter (90) may be formed on a first surface (10a) of a transparent substrate (10). The color filter (90) may be formed to separate red light, green light, and blue light from white light. For example, an RGB color filter (90) (RGB color filter) including a red filter (901), a green filter (902), and a blue filter (903) may be used as the color filter (90).
[0162] The white OLED (92) can be placed on the upper surface (+Y direction) of the color filter (90). In other words, the color filter (90) can be placed below (-Y direction) the white OLED (92). For example, the color filter (90) can be placed between the transparent substrate (10) and the white OLED (92).
[0163] The white OLED (92) can be formed to generate white light. The white OLED (92) may include an organic light-emitting layer (921), a transparent electrode (922), and a non-transparent electrode (923).
[0164] The organic light-emitting layer (921) can be formed to emit white light.
[0165] The transparent electrode (922) can be placed on the upper surface (+Y direction) of the color filter (90). In other words, the color filter (90) can be placed below (-Y direction) the transparent electrode (922). An organic light-emitting layer (921) can be placed on the upper surface (+Y direction) of the transparent electrode (922). Since the transparent electrode (922) can be formed in the same way as the transparent electrode (44) of the rear light-emitting part (40) according to the above-described embodiment, a redundant description is omitted.
[0166] The non-transparent electrode (923) can be placed on the upper surface (+Y direction) of the organic light-emitting layer (921). In other words, the organic light-emitting layer (921) can be placed below (-Y direction) the non-transparent electrode (923). The organic light-emitting layer (921) can be placed between the transparent electrode (922) and the non-transparent electrode (923).
[0167] When voltage is applied to the non-transparent electrode (923) and the transparent electrode (922), the organic light-emitting layer (921) can emit white light. The white light emitted from the organic light-emitting layer (921) can pass through the transparent electrode (922) and be incident on the color filter (90). A portion of the white light emitted from the organic light-emitting layer (921) can be reflected by the non-transparent electrode (923), pass through the transparent electrode (922), and be incident on the color filter (90).
[0168] Red light, green light, and blue light may be emitted from the color filter (90). The red light, green light, and blue light emitted from the color filter (90) may pass through the transparent substrate (10) and be emitted to the rear (-Y direction) of the transparent substrate (10). A rear image may be formed by the light emitted to the rear (-Y direction) of the transparent substrate (10).
[0169] FIG. 10 is a cross-sectional view showing a blue OLED (93) and a color filter (94) used as a rear light-emitting part (40) of a double-sided transparent display device (1) according to one or more embodiments of the present disclosure.
[0170] Referring to FIG. 10, the rear light-emitting part (40) of a double-sided transparent display device (1) according to one or more embodiments of the present disclosure may include a color filter (94) and a blue OLED (93).
[0171] A color filter (94) may be formed on a first surface (10a) of a transparent substrate (10). The color filter (94) may be formed to convert blue light into red light and green light. The color filter (94) may include a transparent portion (943) that passes blue light, a red filter (941) formed to convert blue light into red light, and a green filter (942) formed to convert blue light into green light. For example, a quantum dot color filter may be used as the color filter (94).
[0172] The blue OLED (93) can be placed on the upper surface (+Y direction) of the color filter (94). In other words, the color filter (94) can be placed below (-Y direction) the blue OLED (93). For example, the color filter (94) can be placed between the transparent substrate (10) and the blue OLED (93).
[0173] The blue OLED (93) can be formed to generate blue light. The blue OLED (93) may include an organic light-emitting layer (931), a transparent electrode (932), and a non-transparent electrode (933).
[0174] The organic light-emitting layer (931) can be formed to emit blue light.
[0175] The transparent electrode (932) can be placed on the upper surface (+Y direction) of the color filter (94). In other words, the color filter (94) can be placed below (-Y direction) the transparent electrode (932). An organic light-emitting layer (931) can be placed on the upper surface of the transparent electrode (932). Since the transparent electrode (932) can be formed in the same way as the transparent electrode (44) of the rear light-emitting part (40) according to the above-described embodiment, a redundant description is omitted.
[0176] The non-transparent electrode (933) can be placed on the upper surface (+Y direction) of the organic light-emitting layer (931). In other words, the organic light-emitting layer (931) can be placed below (-Y direction) the non-transparent electrode (933). The organic light-emitting layer (931) can be placed between the transparent electrode (932) and the non-transparent electrode (933).
[0177] When voltage is applied to the non-transparent electrode (933) and the transparent electrode (932), the organic light-emitting layer (931) can emit blue light. The blue light emitted from the organic light-emitting layer (931) can pass through the transparent electrode (932) and be incident on the color filter (94). A portion of the blue light emitted from the organic light-emitting layer (931) can be reflected by the non-transparent electrode (933), pass through the transparent electrode (932), and be incident on the color filter (94).
[0178] Red light, green light, and blue light may be emitted from the color filter (94). The red light, green light, and blue light emitted from the color filter (94) may pass through the transparent substrate (10) and be emitted to the rear (-Y direction) of the transparent substrate (10). A rear image may be formed by the light emitted to the rear (-Y direction) of the transparent substrate (10).
[0179] Although the present disclosure has been illustrated and described above with reference to various embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the scope of the present disclosure as defined by the appended claims and equivalents.
Claims
1. Transparent substrate; and It includes a plurality of transparent pixels arranged in a grid shape on a first surface of the transparent substrate; Each of the above plurality of transparent pixels is, Rectangular opening; A forward light-emitting part provided on one side of the above-mentioned opening and formed to emit light toward the front of the first surface of the transparent substrate; A rear light-emitting part formed adjacent to the front light-emitting part on one side of the opening where the front light-emitting part is formed, and configured to emit light toward the rear opposite to the front; and A double-sided transparent display device comprising: a non-transparent electrode disposed on the uppermost layer of the rear light-emitting part.
2. In Paragraph 1, A double-sided transparent display device in which the above-mentioned front light-emitting part is formed of a micro LED.
3. In Paragraph 2, A double-sided transparent display device in which the rear light-emitting part is formed as any one of an RGB OLED, a white OLED, or a blue OLED.
4. In Paragraph 1, A first anti-reflective film disposed to cover the plurality of transparent pixels; and A double-sided transparent display device further comprising: a second low-reflection film disposed to cover a second surface of the transparent substrate opposite to the first surface of the transparent substrate on which the plurality of transparent pixels are installed.
5. In Paragraph 4, The first anti-reflection film and the second anti-reflection film are each A substrate having a high refractive index; and A double-sided transparent display device comprising: a low-reflection layer formed on one side of the above-described surface.
6. In Paragraph 5, A double-sided transparent display device having a refractive index of 1.65 or higher as described above.
7. In Paragraph 4, A double-sided transparent display device in which a passivation layer is disposed between the plurality of transparent pixels and the first low-reflection film.
8. In Paragraph 1, A double-sided transparent display device further comprising an additional transparent substrate disposed on the upper side of the plurality of transparent pixels.
9. In Paragraph 8, A first low-reflection film disposed to cover the additional transparent substrate; and A double-sided transparent display device further comprising: a second low-reflection film disposed to cover a second surface of the transparent substrate opposite to the first surface of the transparent substrate on which the plurality of transparent pixels are installed.
10. Transparent substrate; and A plurality of light-emitting parts arranged at regular intervals on the first surface of the transparent substrate; comprising Each of the above plurality of light-emitting parts is, A forward light-emitting part formed to emit light toward the front of the first surface of the transparent substrate; A rear light-emitting part arranged in a straight line with the front light-emitting part and formed to emit light toward the rear of the transparent substrate; and It includes a non-transparent electrode disposed on the uppermost layer of the rear light-emitting part; and A double-sided transparent display device in which external light passes through a portion of a transparent substrate between the plurality of light-emitting parts.
11. In Paragraph 10, A double-sided transparent display device in which the transparent substrate is not exposed between the front light-emitting part and the rear light-emitting part.
12. In Paragraph 10, A double-sided transparent display device in which the above-mentioned front light-emitting part is formed of a micro LED.
13. In Paragraph 12, A double-sided transparent display device in which the rear light-emitting part is formed as any one of an RGB OLED, a white OLED, or a blue OLED.
14. In Paragraph 10, A first low-reflection film disposed to cover the first surface of the transparent substrate and the plurality of light-emitting parts; and A double-sided transparent display device further comprising: a second low-reflection film disposed to cover a second surface of the transparent substrate opposite to the first surface of the transparent substrate on which the plurality of light-emitting parts are installed.
15. In Paragraph 14, The first anti-reflection film and the second anti-reflection film are each A substrate having a high refractive index; and A double-sided transparent display device comprising: a low-reflection layer formed on one side of the above-described surface.