Light control panel and transparent display device including the same

Abstract

Disclosed are a light control panel and a transparent display device including the same. A light control panel according to an exemplary embodiment of the present disclosure includes: a first electrode and a second electrode disposed to face each other; and a dielectric layer and charged particles, the dielectric layer and the charged particles being disposed between the first electrode and the second electrode. The dielectric layer is formed of a dielectric material having a dielectric constant, and includes a recess and a spacer. The first electrode includes a plurality of block electrodes that are divided into a plurality of blocks and are individually driven.

Description

Technical Field

[0001] The present disclosure relates to a light control panel and a transparent display device including the light control panel. More specifically, the present disclosure relates to, for example, but not limited to, a light control panel and a transparent display device including the light control panel that can improve picture quality characteristics by increasing transmittance and shielding ratio. Background Art

[0002] With the development of the information society, the demand for display devices for displaying images is increasing in various forms. Therefore, recently, some display devices have been used, such as liquid crystal displays (LCDs), field emission display (FED) devices, plasma display panels (PDPs), quantum dot light emitting displays (QLEDs), inorganic light emitting displays (LEDs), and organic light emitting displays (OLEDs).

[0003] In particular, the organic light emitting display device not only has an advantage in power consumption due to low voltage driving, but also has excellent color reproduction, response speed, viewing angle, and contrast, and thus has attracted much attention as a next-generation display.

[0004] Recently, active research has been conducted on a transparent display device in which some regions include a transmissive region that allows external light to pass through, so that an object or an image located in the background or on the other side of the display device can be viewed. Research has been conducted on a light control device to control the light transmittance or reflectance by applying the light control device to such a transparent display device or an image display device.

[0005] The descriptions provided in the description of the background art section should not be assumed to be prior art merely because they are mentioned in the description of the background art section or are associated with the description of the background art section. The description of the background art section may include information describing one or more aspects of the subject technology, and the description in this section does not limit the present invention. Summary of the Invention

[0006] The inventors have recognized the limitations and requirements in the light transmittance of display devices. Therefore, an object to be achieved by the present disclosure is to provide a light control panel and a transparent display device including the light control panel that can selectively improve display clarity by a light blocking mode that blocks light and allow the background of the display panel to be visible through transmitted light in a transmission mode.

[0007] In addition, another object to be achieved by the present disclosure is to provide a light control panel and a transparent display device including the light control panel that can increase the light transmittance in a transmission mode.

[0008] In addition, another object to be achieved by the present disclosure is to provide a transparent display panel and a display device that can achieve environmental, social, and governance (ESG) by increasing the lifespan of the display device to reduce the generation of greenhouse gases that may be caused during the manufacturing process of producing a new display device.

[0009] The objects of the present disclosure are not limited to the above objects, and those skilled in the art can clearly understand other objects not mentioned above based on the following description.

[0010] According to one aspect of the present disclosure, an optical control panel includes: a first electrode and a second electrode, the first electrode and the second electrode being arranged to face each other; and a dielectric layer and charged particles, the dielectric layer and the charged particles being arranged between the first electrode and the second electrode, wherein the dielectric layer is provided with one or more grooves, and the dielectric layer has a dielectric pattern provided between adjacent grooves and a plurality of spacers protruding toward the second electrode on a part of the top surface of the dielectric pattern.

[0011] According to another aspect of the present disclosure, an optical control panel includes: a first electrode and a second electrode arranged to face each other; and a dielectric layer and charged particles, the dielectric layer and the charged particles being arranged between the first electrode and the second electrode, wherein the dielectric layer includes: a first dielectric layer formed of a first dielectric material having a first dielectric constant and provided with grooves; and a second dielectric including a plurality of light-blocking particles and a solvent formed of a second dielectric material having a second dielectric constant smaller than the first dielectric constant, and the first dielectric layer has a dielectric pattern provided between adjacent grooves and spacers protruding toward the second electrode on a part of the top surface of the dielectric pattern. The grooves may have a bar shape.

[0012] According to still another aspect of the present disclosure, a transparent display device includes: a transparent display panel including a transmissive area that transmits external light and a non-transmissive area provided with a plurality of pixels; a first electrode and a second electrode, the first electrode and the second electrode being arranged to face each other; and a dielectric layer and charged particles, the dielectric layer and the charged particles being arranged between the first electrode and the second electrode, wherein the dielectric layer is provided with one or more grooves, and wherein the dielectric layer has a dielectric pattern provided between adjacent grooves and a plurality of spacers protruding toward the second electrode on a part of the top surface of the dielectric pattern.

[0013] According to another aspect of the present disclosure, a transparent display device includes: a transparent display panel including a transmissive region through which external light passes and a non-transmissive region provided with a plurality of pixels; and a light control panel including a first electrode, a second electrode, and a dielectric layer disposed between the first electrode and the second electrode, wherein the dielectric layer includes: a first dielectric layer formed of a first dielectric material having a first dielectric constant and provided with grooves; and a second dielectric layer including a plurality of light-blocking particles and a solvent formed of a second dielectric material having a second dielectric constant smaller than the first dielectric constant, and the first dielectric layer has spacers protruding toward the second electrode disposed between adjacent grooves. The grooves may have a bar shape. The first electrode may have a bar shape while intersecting the grooves.

[0014] The top surface of the spacer may be coated with a black resin.

[0015] According to the light control panel and the transparent display device of the present disclosure, a light-blocking mode and a transmissive mode can be selectively achieved. As a result, according to the transparent display device of the present disclosure, by allowing a user to clearly see an object and a background located on the rear surface of the transparent display device in the transmissive mode, while blocking external light from penetrating into the transparent display device in the light-blocking mode, an image with a high contrast can be provided to the user.

[0016] According to the light control panel and the transparent display device of the present disclosure, the light control panel can be separated to form a plurality of unit cells and each unit cell can be driven individually, thereby controlling the transmittance for each region.

[0017] In addition, according to the light control panel and the transparent display device of the present disclosure, the first dielectric layer may have grooves, so that during the transmissive mode, a plurality of light-blocking particles can move into the grooves and may not remain on the top surface of the first dielectric layer. As a result, according to the light control panel and the transparent display device of the present disclosure, the light transmittance in the transmissive mode can be increased.

[0018] In addition, according to the light control panel and the transparent display device of the present disclosure, each of the plurality of unit cells of the light control panel includes a lower electrode and an upper electrode, and the lower electrode may include a patterned electrode. As a result, when operating in the transmissive mode, the light-blocking particles can move into the grooves formed with the patterned electrode and may not remain on the top surface of the first dielectric layer. As a result, according to the optical control panel and the transparent display device of the present disclosure, the light transmittance in the transmissive mode can be maximized.

[0019] In addition, according to the light control panel and the transparent display device of the present disclosure, the spacers of the first dielectric layer are arranged to overlap with the non-transmissive region of the transparent display panel, so that when the transparent display device operates in the transmissive mode, the light transmittance of the transparent display device can be prevented from deteriorating due to the spacers.

[0020] In addition, in the light control panel and the transparent display device according to the present disclosure, the transmittance of each region can be changed by adjusting the magnitudes of the voltages applied to the upper electrode and the lower electrode of each region.

[0021] In addition, in the light control panel and the transparent display device according to the present disclosure, by forming a first dielectric layer with a predetermined thickness in the region where the groove is formed, the influence of the light-blocking particles due to the aggregation of the light-blocking particles in the groove can be alleviated. As a result, in the light control panel and the transparent display device according to the present disclosure, damage to the light-blocking particles can be suppressed. In addition, in the light control panel and the transparent display device according to the present disclosure, by making the dielectric constant difference between the first dielectric layer and the second dielectric layer large, a plurality of light-shielding particles can be allowed to completely enter the groove of the first dielectric layer.

[0022] In addition, in the light control panel and the transparent display device according to the present disclosure, by simultaneously forming the dielectric pattern, the spacer, and the groove through an imprint process, the manufacturing process cost can be reduced and the manufacturing process can be simplified to shorten the manufacturing process time, thereby reducing production energy. In addition, in the light control panel and the transparent display device according to the present disclosure, by reducing the manufacturing process to reduce the generation of greenhouse gases that may be caused by the manufacturing process, environmental, social, and governance (ESG) can be achieved.

[0023] The effects according to the present disclosure are not limited to the above-exemplified contents, and more different effects are included in the present disclosure. Description of the Drawings

[0024] The above and other aspects, features, and other advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings, where:

[0025] Figure 1 is a perspective view schematically showing a transparent display device according to an exemplary embodiment of the present disclosure;

[0026] Figure 2 is a plan view of a transparent display panel according to an exemplary embodiment of the present disclosure;

[0027] Figure 3 shows Figure 2 an example of a transmissive region and a non-transmissive region provided in the display region of;

[0028] Figure 4 is Figure 3 a circuit diagram of a sub-pixel of;

[0029] Figure 5 is a cross-sectional view taken along the line I-I' of Figure 3 ;

[0030] Figure 6is a perspective view showing a light control panel according to a first exemplary embodiment of the present disclosure;

[0031] Figure 7A is a cross-sectional view showing a first exemplary embodiment of the present disclosure;

[0032] Figure 7B 、 Figure 7C and Figure 7D is showing Figure 7A a cross-sectional view of a first exemplary embodiment of the present disclosure in a light-blocking mode;

[0033] Figure 8A 、 Figure 8B and Figure 8C is a cross-sectional view of a first exemplary embodiment of the present disclosure in a transmission mode;

[0034] Figure 9A and Figure 9B is a cross-sectional view showing a light control panel in a light-blocking mode according to a second exemplary embodiment of the present disclosure;

[0035] Figure 10A 、 Figure 10B and Figure 10C is a schematic diagram showing a light control panel and a transparent display device in a transmission mode according to a second exemplary embodiment of the present disclosure;

[0036] Figure 11A is a perspective view showing a third exemplary embodiment of the present disclosure, and Figure 11B and Figure 11C is a schematic diagram showing a light control panel and a transparent display device in a transmission mode;

[0037] Figure 12A 、 Figure 12B and Figure 12C is a perspective view comparing the transmittance when different voltages are applied in an exemplary embodiment of the present disclosure; and

[0038] Figure 13 is a schematic diagram of an exemplary embodiment for changing the transmittance of each region according to an exemplary embodiment of the present disclosure.

[0039] Throughout the drawings and the detailed description, unless otherwise described, the same reference numerals should be understood to refer to the same elements, features, and structures. For clarity, illustration, and convenience, the relative sizes and descriptions of these elements may be exaggerated. Detailed Description

[0040] Advantages and features of the present disclosure, and methods for realizing these advantages and features, will become clear by referring to the exemplary embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the exemplary embodiments disclosed below, but can be implemented in various different forms. These exemplary embodiments are provided only to make the disclosure of the present disclosure complete and to fully inform those skilled in the art to which the present disclosure pertains of the scope of the present disclosure, and the present disclosure is defined only by the scope of the appended claims.

[0041] When explaining components, even without a separate explicit statement, the component is interpreted as including an error range.

[0042] When using terms such as "after", "subsequently", "next", "then", "before" to describe a chronological relationship, unless these terms are used together with the term "immediately" or "directly", the order may not be continuous.

[0043] When describing components of the exemplary embodiments of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are used to distinguish one component from another, but the nature, order, or quantity of the components is not limited by these terms. When one component is "linked", "coupled", or "connected" to another component, the one component may be directly linked, coupled, or connected to the other component. However, unless otherwise specifically stated, it should be understood that a third component may be interposed between the components that can be indirectly linked, coupled, or connected.

[0044] It should be understood that "at least one" includes all combinations of one or more associated components. For example, "at least one of the first component, the second component, and the third component" means not only including the first component, the second component, or the third component, but also including all combinations of two or more of the first component, the second component, and the third component.

[0045] In the present disclosure, the "display device / display apparatus" can, in a narrow sense, include a display device / display apparatus including a display panel and a driver for driving the display panel, such as a liquid crystal module (LCM), an inorganic light-emitting module (LED module), an organic light-emitting module (OLED module), and a quantum dot module. In addition, the "display device / display apparatus" can also include a complete electronic device or a complete set of devices (or a complete set of apparatuses) that are complete products or final products including LCM, OLED modules, QD modules, etc., such as a laptop computer, a television, or a computer monitor, an automotive display device or an in-vehicle display device including another type of vehicle, and a mobile electronic device including a smart phone or an electronic tablet.

[0046] Therefore, the display device / display apparatus of the present disclosure may not only include the display device / display apparatus itself in a narrow sense, such as an LCM, an OLED module, a QD module, etc., but may also be an application product or a set of equipment including the end-consumer device including an LCD, an OLED module, a QD module, etc.

[0047] In addition, in some cases, an LCM, an OLED module, or a QD module composed of a display panel and a driver may be represented as a display device / display apparatus in a narrow sense, and an electronic device as a complete product including an LCM, an OLED module, and a QD module may be represented as a "set of equipment". For example, the display device / display apparatus in a narrow sense includes a liquid crystal (LCD) display panel, an OLED display panel, or a quantum dot display panel, and a source PCB as a controller for driving the display panel. On the contrary, the set of equipment may be a concept further including a set of PCBs as a set of controllers electrically connected to the source PCB to control the entire set of equipment.

[0048] As the display panel used in the exemplary embodiments of the present disclosure, any type of display panel may be used, such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, a quantum dot (QD) display panel, and an electroluminescent display panel. The display panel of the present exemplary embodiment is not limited to a specific display panel in which the border is bent together with the flexible substrate for the organic light emitting diode (OLED) display panel and the backplane support structure thereunder. In addition, the display panel for the display apparatus according to the exemplary embodiments of the present disclosure is not limited to the shape or size of the display panel.

[0049] For example, when the display panel is an OLED display panel, the display panel may include a plurality of gate lines, data lines, and pixels formed at the intersection regions of the gate lines and / or the data lines. In addition, the display panel may be configured to include an array, a light emitting diode layer located on the array, a package substrate or a package layer provided on the array to cover the light emitting diode layer, etc., and the array includes thin film transistors as elements for selectively applying a voltage to each pixel. The package layer may protect the thin film transistors, the light emitting diode layer, etc. from external impacts, and may inhibit moisture or oxygen from penetrating into the light emitting diode layer. In addition, the layer formed on the array may include an inorganic light emitting layer, such as a quantum dot of a nano-sized material layer, etc.

[0050] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the exemplary embodiments belong. It will be further understood that terms, such as those defined in a common dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the related art, and should not be interpreted in an idealized or overly formal sense unless explicitly so defined herein.

[0051] In aspects of the present disclosure, for ease of description, the source electrode and the drain electrode are distinguished from each other. However, the source electrode and the drain electrode may be used interchangeably. The source electrode may be the drain electrode, and the drain electrode may be the source electrode. In addition, the source electrode in any aspect of the present disclosure may be the drain electrode in another aspect of the present disclosure, and the drain electrode in any aspect of the present disclosure may be the source electrode in another aspect of the present disclosure.

[0052] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the following drawings and exemplary embodiments. For purposes of description, the proportions of the components shown in the drawings are different from the actual proportions, and thus the proportions are not limited to those shown in the drawings.

[0053] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the drawings.

[0054] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. The exemplary embodiments provided below are provided by way of example so that the spirit of the present disclosure can be fully conveyed to those skilled in the art. Therefore, the present disclosure is not limited to the exemplary embodiments described below and can be implemented in various different forms.

[0055] In addition, in the drawings, for convenience, the width, length, thickness, etc. of the device may be enlarged. For ease of description, the proportions of the components shown in the drawings are different from the actual proportions, and thus are not limited to those shown in the drawings. Throughout the specification, the same reference numerals denote the same components.

[0056] In addition, when a detailed description of known technology related to the present disclosure may obscure the gist of the present disclosure, its detailed description will be omitted.

[0057] When used as described in the present disclosure, such as "comprising", "having", "including", "containing", "constituting", "made of", "formed by", "composed of", etc., other components may be added. When a component is expressed in the singular, unless otherwise clearly stated, it may include cases including the plural.

[0058] In the case of describing positional relationships, for example, when the positional relationship between two components is described as "on", "above", "over", "below", "beneath", "beside", "under", "near", "close to", "adjacent to", "on the side of", "proximate to", etc., unless "immediately" or "directly" is used, one or more other components may be located between these two components. The spatial relative terms "below", "beneath", "under", "lower", "above", "upper", etc. may be used to easily describe the correlation between one element or component shown in the drawings and other elements or components. The spatial relative terms should be understood to include terms for different orientations of the element during use or operation in addition to the orientations shown in the drawings. For example, when the element shown in the drawings is flipped upward, an element described as being "below" or "beneath" another component may be disposed "above" the other component. Thus, the exemplary term "below" may include both downward and upward directions.

[0059] Terms such as first, second, A, B, (a), (b), etc. may be used to describe the components of the present disclosure. These terms are only used to distinguish the described components from other components, and the nature, order, sequence, quantity, etc. of the corresponding components are not limited by these terms.

[0060] When adding reference numerals to the components of each drawing, the same components will be denoted by the same reference numerals, even if they are shown in different drawings. In addition, when describing the present disclosure, well-known functions or configurations will not be described in detail, as they may unnecessarily obscure the gist of the present disclosure.

[0061] Each feature of the various exemplary embodiments of the present disclosure can be partially or fully coupled or combined with each other and implemented with various technical linkages and operations, and each exemplary embodiment can be implemented independently of each other or can be implemented together in a related relationship.

[0062] Hereinafter, the exemplary embodiments of the present disclosure will be described with reference to the drawings and exemplary embodiments. Figure 1 is a perspective view showing a transparent display device according to an exemplary embodiment of the present disclosure.

[0063] In Figure 1 and Figure 2 , the X-axis represents a direction parallel to the gate line, the Y-axis represents a direction parallel to the data line, and the Z-axis represents the height direction of the display device.

[0064] A display device 10 according to an exemplary embodiment of the present disclosure will be described. Emphasis is placed on implementing it as an organic light emitting display, but it may also be implemented as an inorganic light emitting display, a liquid crystal display, a plasma display panel (PDP), a quantum dot light emitting display (QLED), or an electrophoretic display.

[0065] Referring Figure 1 , a transparent display device 10 according to an exemplary embodiment of the present disclosure includes a transparent display panel 100 and a light control panel 200. In the display panel 100, a display area and a non-display area provided near, around, or surrounding the display area may be defined.

[0066] The transparent display panel 100 includes a plurality of pixels for displaying an image. At least some areas of the transparent display panel 100 may be provided with a transmissive area that allows most of the light incident from the outside to pass through. The transparent display panel 100 may have a transmissive area between the plurality of pixels. Due to the presence of the transmissive area, the transparent display panel 100 allows an external object or background to be visible.

[0067] The light control panel 200 may be provided on at least one surface of the transparent display panel 100 and may control the light incident on the transparent display panel 100. The light control panel 200 may include an ink containing charged particles that move by an electric field. The light control panel 200 may implement a light blocking mode and a transmissive mode by controlling the movement of the ink containing the charged particles. According to the voltage applied to the ink containing the charged particles, the light blocking mode may be converted to the transmissive mode, or the transmissive mode may be converted to the light blocking mode. The light control panel 200 may block the incident light in the light blocking mode and transmit the incident light in the transmissive mode.

[0068] Preferably, the light control panel 200 is provided in a direction opposite to the direction in which the transparent display panel 100 emits light. For example, when the transparent display panel 100 is a top emission type, the light control panel 200 may be provided below the transparent display panel 100, as Figure 1 shown. As another example, when the transparent display panel 100 is a bottom emission type, the light control panel 200 may be provided on the transparent display panel 100.

[0069] The light control panel 200 may be attached to one surface of the transparent display panel 100 using an adhesive layer (not shown). The adhesive layer (not shown) may be a transparent adhesive film such as an optically clear adhesive (OCA) or a transparent adhesive such as an optically clear resin (OCR).

[0070] In Figure 1In [the figure], the light control panel 200 is shown as being disposed on one surface of the transparent display panel 100 that is exposed to the outside, but it is not necessarily limited thereto. The light control panel 200 may be disposed within the transparent display panel 100. In this case, the light control panel 200 may be disposed on the top surface of one of the multiple layers provided in the transparent display panel 100. As an example, the light control panel 200 may be disposed between the transistors and the substrate of the transparent display panel 100. In this case, the light control panel 200 may not be provided with a separate substrate.

[0071] Hereinafter, reference will be made to Figures 2 to 4 describe the transparent display panel 100 in more detail. Figure 2 is a plan view showing a transparent display panel according to an exemplary embodiment of the present disclosure, Figure 3 is shown in Figure 2 a schematic diagram of an example of a transmissive region and a non-transmissive region provided in the display region of Figure 4 is a circuit diagram of a sub-pixel, and Figure 5 is along Figure 3 a cross-sectional view taken along line I-I' of

[0072] Referring to Figures 2 to 5 , the transparent display panel 100 according to an exemplary embodiment of the present disclosure may be divided into a display region DA in which pixels P are formed to display an image and a non-display region NDA in which no image is displayed.

[0073] The display region DA may be provided with a first signal line SL1, a second signal line SL2, and pixels P. The non-display region NDA may include a pad region PA provided with pads and at least one scan driver 205. However, the components of the display device of the present disclosure are not limited thereto. For example, the display device may further include a data driver and a timing controller for controlling the scan driver and the data driver. In addition, all components of each display device according to all embodiments of the present disclosure are operably coupled and configured.

[0074] The data driver (not shown) may convert the image data received from the timing controller into a gamma compensation voltage and output a data voltage in response to a data control signal provided from the timing controller. The data voltage output from the data driver may be supplied to the data line DL. The data driver may be configured with at least one data IC. In this case, as an example, the data IC of the data driver may be connected to the non-display region on the corresponding side of the display panel 100, or may be directly mounted on the non-display region. As an example, the data IC of the data driver 110 may be mounted on a flexible circuit film and connected to the non-display region on the corresponding side of the display panel 100.

[0075] The timing controller can align the image data input from the outside and supply the aligned image data to the data driver. The timing controller can generate a gate control signal and a data control signal based on timing signals (such as a dot clock signal, a data enable signal, and a horizontal / vertical synchronization signal) synchronized with the input image signal. Here, the horizontal synchronization signal is a signal indicating the time taken for one horizontal line of the display screen, and the vertical synchronization signal is a signal indicating the time taken for displaying one frame of the screen. The data enable signal can correspond to a signal indicating the period for supplying a data voltage to the pixels. The timing controller can control the operation timing of the scan driver and the data driver by supplying the gate control signal to the scan driver and the data control signal to the data driver.

[0076] The first signal line SL1 and the pixel P can be set to extend in the first direction (e.g., the Y-axis direction) in the display area DA. For example, the first signal line SL1 can be a data line, but it is not limited thereto. The first signal line SL1 can include at least one of a pixel power line, a common power line, and a reference line.

[0077] The second signal line SL2 can extend in the second direction (e.g., the X-axis direction) in the display area DA and can intersect the first signal line SL1 in the display area DA. For example, the second signal line SL2 can be a scan line, but it is not limited thereto.

[0078] The scan driver 205 is connected to the scan line to supply a scan signal. The scan driver 205 can be formed in a non-display area NDA outside one or both sides of the display area DA of the transparent display panel 100 using an in-panel gate driver (GIP) type or a tape automated bonding (TAB) type.

[0079] The scan driver 205 can supply a scan signal to the scan line SL in response to a gate control signal provided from a timing controller (not shown). The scan driver 205 can be provided at least in the non-display area NDA of the display panel 100 as shown in Figure 2 or in the display area DA. Although two scan drivers 205 are shown provided on both sides of the display panel 100 in Figure 2 , the number and arrangement of the scan drivers 205 are not limited thereto. For example, one scan driver 205 can be provided on one side of the display panel 100. For example, the scan driver 205 can be mounted on the display panel 100. Thus, a structure in which the scan driver 205 is directly mounted on the display panel 100 is referred to as an in-panel gate (GIP) structure, but it is not limited thereto. Alternatively, the scan driver 205 can be spaced apart from the display panel 100.

[0080] As shown in Figure 3As shown, the display area DA includes a transmissive area TA and a non-transmissive area NTA. The transmissive area TA is an area that transmits most of the light incident from the outside, and the non-transmissive area NTA is an area that does not transmit most of the light incident from the outside. For example, the transmissive area TA may be an area with a light transmittance greater than α%, and the non-transmissive area NTA may be an area with a light transmittance less than β%. In this case, α is a value greater than β. Due to the existence of the transmissive area TA of the transparent display panel 100, an object or background located on the rear surface of the transparent display device 10 can be viewed through the transparent display device 10.

[0081] The non-transmissive area NTA includes a light-emitting area EA in which a plurality of pixels P are disposed and emit light. The plurality of pixel areas may be arranged in a matrix form along a plurality of row lines and column lines. The plurality of pixel areas may include pixel areas that display different colors (e.g., red (R), green (G), and blue (B) or red (R), green (G), blue (B), and white). At this time, adjacent red (R), green (G), and blue (B) pixel areas or adjacent red (R), green (G), blue (B), and white pixel areas to each other may be used as unit pixels for displaying a color image. Each of the plurality of pixels P may include a first sub-pixel SP1, a second sub-pixel SP2, a third sub-pixel SP3, and a fourth sub-pixel SP4. The first sub-pixel SP1 may include a first light-emitting area EA that emits a first color light, and the second sub-pixel SP2 may include a second light-emitting area EA that emits a second color light. The third sub-pixel SP3 may include a third light-emitting area EA that emits a third color light, and the fourth sub-pixel SP4 may include a fourth light-emitting area EA that emits a fourth color light.

[0082] For example, the first light-emitting area EA to the fourth light-emitting area EA can all emit different color lights. For example, the first light-emitting area EA may emit green light, and the second light-emitting area EA may emit red light. The third light-emitting area EA may emit blue light, and the fourth light-emitting area EA may emit white light. For example, the first light-emitting area EA may emit blue light, the second light-emitting area EA may emit green light, the third light-emitting area EA may emit red light, and the fourth light-emitting area EA may emit white light. However, the present disclosure is not limited thereto. In addition, the setting order of each of the sub-pixels SP1, SP2, SP3, and SP4 can be changed in various ways.

[0083] For example, the multiple sub-pixels SP may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, where the red sub-pixel, the green sub-pixel, and the blue sub-pixel may be arranged in a repeating manner. Alternatively, the multiple sub-pixels SP may include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, where the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel may be arranged in a repeating manner, or the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel may be arranged in a quadrilateral type. For example, the red sub-pixel, the blue sub-pixel, and the green sub-pixel may be sequentially arranged along the row direction, or the red sub-pixel, the blue sub-pixel, the green sub-pixel, and the white sub-pixel may be sequentially arranged along the row direction. However, in the embodiments of the present disclosure, the color type, the arrangement type, and the arrangement order of the sub-pixels are not limited and may be configured in various forms according to the light-emitting characteristics, the device lifetime, and the device specifications.

[0084] In addition, according to the light-emitting characteristics, the sub-pixels may have different light-emitting areas. For example, the sub-pixels emitting light of a color different from that of the blue sub-pixel may have a light-emitting area different from that of the blue sub-pixel. For example, the red sub-pixel, the blue sub-pixel, and the green sub-pixel or the red sub-pixel, the blue sub-pixel, the white sub-pixel, and the green sub-pixel may each have a different light-emitting area.

[0085] Referring to Figure 4 , each of the first sub-pixel to the fourth sub-pixel SP1, SP2, SP3, and SP4 may include a switching transistor SW, a driving transistor DR, a capacitor Cst, a compensation circuit CC, and an organic light-emitting diode (OLED).

[0086] The switching transistor SW transmits the data signal supplied through the data line DL to the first node N1 in response to a scan signal supplied through the gate line GL (or scan line). The capacitor Cst is electrically connected to the first node N1 to charge the voltage applied to the first node N1. The driving transistor DR may control the amount of driving current flowing in the organic light-emitting diode (OLED) in response to the voltage applied to the gate electrode.

[0087] The semiconductor layer of the switching transistor SW or / and the driving transistor DR may be formed of a semiconductor material such as an oxide semiconductor, an amorphous semiconductor, or a polycrystalline semiconductor, but is not limited thereto.

[0088] Oxide semiconductor materials can have excellent effects in preventing leakage current and relatively low manufacturing costs. Oxide semiconductors can be made of metal oxides such as zinc (Zn), indium (In), gallium (Ga), tin (Sn), and titanium (Ti), or combinations of metals such as zinc (Zn), indium (In), gallium (Ga), tin (Sn), or titanium (Ti) and their oxides. Specifically, oxide semiconductors can include zinc oxide (ZnO), zinc tin oxide (ZTO), zinc indium oxide (ZIO), indium oxide (InO), titanium oxide (TiO), indium gallium zinc oxide (IGZO), indium zinc tin oxide (IZTO), indium zinc oxide (IZO), indium gallium tin oxide (IGTO), and indium gallium oxide (IGO), but are not limited thereto.

[0089] Polycrystalline semiconductor materials have fast carrier mobility such as electrons and holes, so they have high mobility, low power consumption, and excellent reliability. Polycrystalline semiconductors can be made of polycrystalline silicon (poly-Si) or low-temperature polycrystalline silicon, but are not limited thereto.

[0090] Amorphous semiconductor materials can be made of amorphous silicon (a-Si), but are not limited thereto.

[0091] An organic light-emitting diode (OLED) outputs light corresponding to a driving current. The organic light-emitting diode (OLED) can output light corresponding to any one of red, green, and blue. The organic light-emitting diode (OLED) can include an anode, a light-emitting layer formed on the anode, and a cathode for supplying a common voltage. The light-emitting layer can be configured to emit the same color of light (e.g., white light) for each pixel, or can be configured to emit different colors of light (e.g., red light, green light, or blue light) for each pixel, but is not limited thereto.

[0092] A compensation circuit CC can be provided in the pixel to compensate for the threshold voltage of the driving transistor DR, etc. The compensation circuit CC can be composed of one or more transistors. The compensation circuit CC can include a capacitor and one or more transistors, and can be configured in various ways according to the compensation method. The pixel including the compensation circuit CC can have various structures such as 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, and 7T2C.

[0093] Figure 5 is a cross-sectional view taken along the Figure 3 line I-I'. Referring to Figure 5 , according to an example of the present disclosure, the transparent display panel 100 includes a first substrate 111 (or a lower substrate) and a second substrate 112 (or an upper substrate) facing each other, and a light-emitting element E including a transistor T, a lower electrode E1, an organic layer EL, and an upper electrode E2 can be provided between the lower substrate 111 and the upper substrate 112.

[0094] The transistor T includes an active layer ACT provided on the lower substrate 111, a first insulating film I1 provided on the active layer ACT, a gate electrode GE provided on the first insulating film I1, a second insulating film I2 provided on the gate electrode GE, and a source electrode SE and a drain electrode DE provided on the second insulating film I2 and connected to the active layer ACT through a first contact hole CNT1 and a second contact hole CNT2. In Figure 5 , the transistor T is shown to be formed in a top-gate manner, but is not limited thereto, and may be formed in a bottom-gate manner in which the gate electrode GE is provided below the active layer ACT.

[0095] A planarization film PNL may be provided on the transistor T to planarize the steps caused by the transistor T and the plurality of signal lines. The planarization film PNL is provided in the non-transmissive region NTA and may not be provided in at least a part of the transmissive region TA. The planarization film PNL may weaken transparency by causing refraction of light when the light is transmitted. Therefore, the transparent display panel 100 according to an exemplary embodiment of the present disclosure may increase transparency by removing a part of the planarization film PNL from the transmissive region TA.

[0096] In addition, in Figure 5 , the first insulating film I1 and the second insulating film I2 provided below the planarization film PNL are shown to be provided not only in the non-transmissive region NTA but also in the transmissive region TA, but are not necessarily limited thereto. In another exemplary embodiment, some of the insulating films provided below the planarization film PNL may not be provided in at least a part of the transmissive region TA to increase transparency. For example, the second insulating film I2 is provided in the non-transmissive region NTA and may not be provided in at least a part of the transmissive region TA.

[0097] A light-emitting element E including a lower electrode E1, an organic layer EL, and an upper electrode E2 and a bank 125 may be provided above the planarization film PNL.

[0098] The lower electrode E1 is provided on the planarization film PNL for each of the sub-pixels SP1, SP2, SP3, and SP4, and the lower electrode E1 may not be provided in the transmissive region TA. The lower electrode E1 may be electrically connected to the transistor T. Specifically, the lower electrode E1 may be connected to one of the source electrode SE and the drain electrode DE of the transistor T through a third contact hole CNT3 penetrating the planarization film PNL. The bank 125 is provided between adjacent lower electrodes E1, so that the adjacent lower electrodes E1 may be electrically insulated from each other.

[0099] The lower electrode E1 can be formed of a metal material having a high reflectivity, such as a stacked structure of aluminum and titanium (Ti / Al / Ti), a stacked structure of aluminum and ITO (ITO / Al / ITO), an Ag alloy, a stacked structure of an Ag alloy and ITO (ITO / Ag alloy / ITO), a MoTi alloy, and a stacked structure of a MoTi alloy and ITO (ITO / MoTi alloy / ITO). The Ag alloy can be an alloy of silver (Ag), palladium (Pd), copper (Cu), etc. The MoTi alloy can be an alloy of molybdenum (Mo) and titanium (Ti). The lower electrode E1 can be referred to as an anode.

[0100] The bank 125 can be provided on the planarization film PNL. The bank 125 can be formed of an opaque material to reduce color mixing between the plurality of sub-pixels SP, and can be formed of, for example, a black resin, but is not limited thereto. In addition, the bank 125 can be formed to cover the edge of the lower electrode E1 and expose a part of the lower electrode E1. Therefore, the bank 125 can suppress the problem of reduced luminous efficiency due to current concentration at the end of the lower electrode E1.

[0101] The organic layer EL can be provided on the lower electrode E1. The organic layer EL can include a hole transport layer, a light-emitting layer, and an electron transport layer. In this case, when a voltage is applied to the lower electrode E1 and the upper electrode E2, holes and electrons move to the light-emitting layer through the hole transport layer and the electron transport layer, respectively, and combine with each other in the light-emitting layer to emit light. In an exemplary embodiment, the organic layer EL can be a common layer generally formed in the sub-pixels SP1, SP2, SP3, and SP4. In this case, the light-emitting layer can be a white light-emitting layer that emits white light. In another exemplary embodiment, the light-emitting layer of the organic layer EL may not be formed in the transmission region TA.

[0102] The upper electrode E2 can be provided on the organic layer EL and the bank 125. The upper electrode E2 can be formed of a transparent conductive material (TCO) such as ITO or IZO that can transmit light, or can be formed of a semi-transmissive conductive material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). When the upper electrode E2 is formed of a semi-transmissive conductive material, the light output efficiency can be increased due to the microcavity. The upper electrode E2 can be referred to as a cathode.

[0103] The encapsulation layer 140 or the encapsulation film 140 may be disposed on the light-emitting element E. The encapsulation layer 140 or the encapsulation film 140 may be formed on the upper electrode E2 to cover the upper electrode E2. The encapsulation layer 140 or the encapsulation film 140 is used to inhibit the penetration of oxygen or moisture into the organic layer EL and the upper electrode E2. To this end, the encapsulation layer 140 or the encapsulation film 140 may include at least one inorganic film and at least one organic film. When the organic film and the inorganic film are stacked in multiple layers, the movement path of moisture or oxygen may be longer than that of a single layer, thereby effectively blocking the penetration of moisture and oxygen that affect the light-emitting layer.

[0104] The encapsulation layer 140 may include a first encapsulation layer, a second encapsulation layer, and a third encapsulation layer. The first to third encapsulation layers may be sequentially stacked on the upper electrode E2. The first encapsulation layer and the third encapsulation layer may be formed of an inorganic film layer including an inorganic material, and the second encapsulation layer may be formed of an organic film layer including an organic material.

[0105] The first encapsulation layer may be formed at the lowermost end of the encapsulation layer 140 to contact the upper surface of the upper electrode E2. The first encapsulation layer may be formed of a material such as silicon nitride SiNx, silicon oxide SiOx, silicon oxynitride SiON, or aluminum oxide Al2O3.

[0106] The second encapsulation layer may be formed on the first encapsulation layer. The second encapsulation layer may be formed of a material such as an acrylic resin, an epoxy resin, a polyimide, a polyethylene PE, or a silicon oxycarbide SiOC.

[0107] The third encapsulation layer may be formed on the second encapsulation layer. The third encapsulation layer may be formed of the same material as the first encapsulation layer, but the present disclosure is not limited thereto, and the third encapsulation layer may be formed of a material different from that of the first encapsulation layer.

[0108] In addition, the encapsulation layer is not limited to three layers. For example, it may include n layers (where n is an integer greater than 3) in which inorganic encapsulation layers and organic encapsulation layers are alternately stacked.

[0109] The color filter CF may be disposed on one surface of the upper substrate 112 facing the lower substrate 111. The color filter CF may be patterned for each sub-pixel SP1, SP2, SP3, and SP4.

[0110] Specifically, the color filter CF may include a first color filter, a second color filter, a third color filter, and a fourth color filter. The first color filter may be arranged to correspond to the light-emitting region EA of the first sub-pixel SP1. For example, the first color filter may be a green color filter that transmits green light. The second color filter may be arranged to correspond to the light-emitting region EA of the second sub-pixel SP2, and may be a red color filter that transmits red light. The third color filter CF3 may be arranged to correspond to the light-emitting region EA of the third sub-pixel SP3, and may be a blue color filter that transmits blue light. The fourth color filter may be arranged to correspond to the light-emitting region EA of the fourth sub-pixel SP4, and may be a white color filter that transmits white light. The white color filter may be formed of a transparent organic material that transmits white light, but is not limited thereto.

[0111] The light-blocking layer BM may be provided between the color filters CF. The light-blocking layer BM may be provided between the sub-pixels SP1, SP2, SP3, and SP4 to suppress color mixing between adjacent sub-pixels SP1, SP2, SP3, and SP4. In addition, the light-blocking layer BM may suppress light incident from the outside from reflecting on the plurality of signal lines provided between the sub-pixels SP1, SP2, SP3, and SP4.

[0112] In addition, the light-blocking layer BM may be provided between the transmissive region TA and the plurality of sub-pixels SP1, SP2, SP3, and SP4 to suppress light emitted from each of the plurality of sub-pixels SP1, SP2, SP3, and SP4 from transmitting to the transmissive region TA. In an exemplary embodiment, the light-blocking layer BM may not be provided between the white sub-pixel and the transmissive region TA. The display panel 100 according to the exemplary embodiment of the present disclosure does not include the light-blocking layer BM between the white sub-pixel and the transmissive region TA, thereby reducing the area where the light-blocking layer BM is formed. As a result, the display panel 100 according to the exemplary embodiment of the present disclosure may improve the transmittance. The light-blocking layer BM may include a light-absorbing material, such as a black dye that absorbs all light in the visible light wavelength range. The light-blocking layer BM may be referred to as a black matrix or BM.

[0113] In order to maintain a high transmittance in the transmissive region TA, the above-described color filter CF and light-blocking layer BM are not provided in the transmissive region TA.

[0114] The lower substrate 111 may be a plastic film, a glass substrate, or a silicon wafer substrate formed using semiconductor processes. The upper substrate 112 may be a plastic film, a glass substrate, or a packaging film. The lower substrate 111 and the upper substrate 112 may be formed of a transparent material. In some exemplary embodiments, the lower substrate 111 and the upper substrate 112 may be formed of a flexible plastic material. In some exemplary embodiments, the lower substrate 111 and the upper substrate 112 may be made of a flexible polymer film. For example, the flexible polymer film may be made of any one of polyimide (PI), polyethylene terephthalate (PET), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polycarbonate (PC), polyethersulfone (PES), polyarylate (PAR), polysulfone (PSF), cycloolefin copolymer (COC), triacetyl cellulose (TAC), polyvinyl alcohol (PVA), and polystyrene (PS), and the present disclosure is not limited thereto. The lower substrate 111 may be formed to be larger than the upper substrate 112, so that a part of the lower substrate 111 may be exposed without being covered by the upper substrate 112.

[0115] As described above, the transparent display device 10 according to an exemplary embodiment of the present disclosure includes a transmissive region TA that transmits incident light almost as it is and a light-emitting region EA that emits light. As a result, in an exemplary embodiment of the present disclosure, an object or background located on the rear surface or the front surface of the transparent display device 10 may be viewed through the transmissive region TA of the transparent display device 10.

[0116] Figure 6 is a perspective view showing a light control panel according to an exemplary embodiment of the present disclosure.

[0117] Referring to Figure 6 , the light control panel 200 according to an exemplary embodiment of the present disclosure may be implemented in a transmissive mode that transmits incident light and a light-blocking mode that blocks incident light. In an exemplary embodiment of the present disclosure, it may be assumed that the light-blocking mode represents a case where the light transmittance of the light control panel 200 is less than β%, and the transmissive mode represents a case where the light transmittance of the light control panel 200 is α% or more. In this case, α may represent a value greater than β. The light transmittance of the light control panel 200 represents the ratio of the output light to the light incident on the light control panel 200.

[0118] For this purpose, as Figure 6As shown, the light control panel 200 according to an exemplary embodiment of the present disclosure includes a first substrate 210, a first electrode 230 disposed on the first substrate 210, a second substrate 220 facing the first substrate 210, a second electrode 240 disposed on the second substrate 220, and a dielectric layer 250 disposed between the first electrode 230 and the second electrode 240. The light control panel 200 may further include an adhesive layer 260 disposed between the dielectric layer 250 and the second electrode 240.

[0119] Each of the first substrate 210 and the second substrate 220 may be a glass substrate or a plastic film, but is not limited thereto. In some exemplary embodiments, the first substrate 210 and the second substrate 220 may be formed of a flexible plastic material. In some exemplary embodiments, the first substrate 210 and the second substrate 220 may be made of a flexible polymer film. For example, the flexible polymer film may be made of any one of polyimide (PI), polyethylene terephthalate (PET), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polycarbonate (PC), polyethersulfone (PES), polyarylate (PAR), polysulfone (PSF), cycloolefin copolymer (COC), triacetyl cellulose (TAC), polyvinyl alcohol (PVA), and polystyrene (PS), and the present disclosure is not limited thereto.

[0120] As Figure 1 shown, the light control panel 200 is disposed outside the transparent display panel 100 and may be disposed in a configuration separated from the transparent display panel 100. In this case, the light control panel 200 may be formed in the form of a film and is disposed on one surface of the transparent display panel 100 through a separate adhesive layer.

[0121] Although not shown in the figure, in another exemplary embodiment, the light control panel 200 may be disposed inside the transparent display panel 100. In this case, the light control panel 200 may be disposed between the lower substrate 111 and the upper substrate 112 of the transparent display panel 100. In this case, the first substrate 210 and the second substrate 220 of the light control panel 200 may be omitted.

[0122] Figure 7A Shows an exemplary embodiment of the present disclosure. Figure 7B 、 Figure 7C and Figure 7D are cross-sectional views showing a light blocking mode according to an exemplary embodiment of Figure 7A . Figure 8A 、 Figure 8B and Figure 8C are cross-sectional views showing a light transmission mode of an exemplary embodiment of the present disclosure.

[0123] As Figure 6 and Figure 7A shown, the first electrode 230 may be disposed on one surface of the first substrate 210 facing the second substrate 220, and the second electrode 240 may be disposed on one surface of the second substrate 220 facing the first substrate 210. Each of the first electrode 230 and the second electrode 240 may be composed of a plurality of electrodes overlapping the entire transparent display panel 100. Specifically, the first electrode 230 may be divided into a plurality of unit electrodes and arranged to drive each unit electrode individually. By applying different magnitudes of voltage to each unit electrode, the transmittance can be changed for each region. The second electrode 240 may be formed as a common electrode.

[0124] The first electrode 230 and the second electrode 240 may be transparent electrodes including a transparent conductive material. For example, the transparent conductive material may include indium tin oxide (ITO) or indium zinc oxide (IZO), etc., and the present disclosure is not limited thereto.

[0125] The dielectric layer 250 is disposed on one surface of the first electrode 230 facing the second electrode 240. The dielectric material may also be coated on the front surface of the second electrode 240. The dielectric layer 250 may be formed of a dielectric material having a first dielectric constant. The dielectric layer 250 includes a dielectric pattern 250c, spacers 250b, and grooves 250a. For example, the grooves 250a are formed in a bar shape at regular intervals in the X-axis direction (i.e., in a direction perpendicular to the arrangement direction of the pixels P) and are arranged to overlap both the light-emitting region and the transmissive region. For example, the spacers 250b are formed in the same direction as the extension direction of the grooves 250a and overlap both the light-emitting region and the transmissive region.

[0126] Specifically, the spacers 250b may be formed such that a part of the top surface of the dielectric pattern 250c protrudes toward the second electrode 240. In this case, the top surface of the spacers 250b may be flat. In addition, a light-blocking layer 255 may be coated on the top surface of the spacers 250b. The light-blocking layer 255 may be a black resin or black ink, but is not limited thereto.

[0127] As Figures 7A to 8C shown, when a voltage is applied to the first electrode 230 and the second electrode 240, dielectric polarization may occur in the dielectric material of the dielectric pattern 250c, and the dielectric polarization density may vary according to the shape of the top surface of the dielectric layer 250. Therefore, the electric field may be formed strongest in the grooves 250a of the dielectric pattern 250c.

[0128] Since multiple charged particles 254a move through the electric field generated between the first electrode 230 and the second electrode 240, when a voltage is applied to the first electrode 230 and the second electrode 240, the multiple charged particles 254a can move along the electric field to the groove 250a, as Figure 8C shown. Accordingly, when a voltage is applied to the first electrode 230 and the second electrode 240, the multiple charged particles 254a may not be disposed in the region where the dielectric pattern 250c is provided and may have a high light transmittance. Accordingly, when a voltage is applied to the first electrode 230 and the second electrode 240, external light may pass through the region where the dielectric pattern 250c is provided, and thus the light passing through the light control panel 200 may be incident on the transparent display panel 100.

[0129] When the light control panel 200 according to an exemplary embodiment of the present disclosure is in the transmission mode, the multiple charged particles 254a move to the groove 250a and may not remain in the region where the dielectric pattern 250c is provided. In the light control panel 200 according to an exemplary embodiment of the present disclosure, external light may pass through the region where the multiple charged particles 254a are not provided (i.e., the region where the dielectric pattern 250c is provided). The light passing through the light control panel 200 is incident on the transparent display panel 100 and may pass through the transparent display panel 100 through the transmission region TA of the transparent display panel 100.

[0130] In this way, external light may pass through the transparent display device 10 through the region of the groove 250a formed in the light control panel 200 and the transmission region TA of the transparent display panel 100. To have a high light transmittance in the transmission mode, the transparent display device 10 according to an exemplary embodiment of the present disclosure may be arranged such that the groove 250a of the light control panel 200 overlaps with the non-transmission region NTA of the transparent display panel 100.

[0131] One of the first electrode 230 or the second electrode 240 may be arranged to overlap with the multiple grooves 250a and the multiple spacers 250b.

[0132] The spacer 250b may be provided between the first electrode 230 and the second electrode 240 to maintain the gap between the first electrode 230 and the second electrode 240. The spacer 250b may be provided between the dielectric patterns 250c adjacent to each other on a plane. The groove 250a may be provided on at least one side of the spacer 250b.

[0133] The spacers 250b may be spaced apart from each other and the groove 250a may be provided therebetween. In addition, the spacers 250b may be spaced apart from each other and multiple grooves 250a may be provided therebetween.

[0134] Multiple charged particles 254a can be negatively or positively charged and are distributed in a solvent 254b, and can block light incident from the outside. The multiple charged particles 254a can be electrophoretic materials or bistable inks.

[0135] The distribution area of the multiple charged particles 254a can vary according to the voltage applied to the first electrode 230 and the second electrode 240.

[0136] As Figures 7B to 7C shown, when a voltage opposite to the charge of the charged particles 254a is applied to the second electrode 240, the charged particles 254a can move toward the second substrate 220 on which the second electrode 240 is formed and be uniformly distributed. Since the light control panel 200 has multiple charged particles 254a distributed above the entire region where the second electrode 240 is provided, external light can be blocked by the multiple charged particles 254a in the entire region to achieve a light blocking mode. The external light does not pass through the light control panel 200 and is not incident not only on the non-transmissive region NTA of the transparent display panel 100 but also on the transmissive region TA. When the charged particles 254a are bistable inks, a material having an electric charge amount is adsorbed onto the particles, and an additive having a specific functional group is also added to the solvent 254b so that it has a certain amount of charge. In addition, even when the voltage applied to the first electrode 230 and the second electrode 240 is cut off, bistability can be ensured by the attractive force between the charged particles 254a and the solvent 254b, so that the charged particles 254a can maintain their state for a long holding period and maintain a set transmittance level.

[0137] Figure 8A 、 Figure 8B and Figure 8C show the charged particles 254a, the light control panel 200, and the display panel 100 in a transmissive mode of an exemplary embodiment of Figure 7A . Figure 8A is a front view of the display device in the transmissive mode, Figure 8B is a cross-sectional view taken along line B - B’ of Figure 7A in the transmissive mode, and Figure 8C shows a cross-sectional view taken along line A - A’ of Figure 7A in the transmissive mode.

[0138] As Figure 8A and Figure 8BAs shown, when a voltage opposite to the charge of the charged particles 254a is applied to the first electrode 230, the charged particles 254a move in the first electrode 230 along the direction of the electric field and gather in the groove 250a in a bar shape. In this case, external light may not pass through the region where the groove 250a is formed by the plurality of charged particles 254a and may be blocked. Therefore, the charged particles 254a can be visible in the form of a band in the transmission region TA, but the width of the groove 250a is small enough compared to the transmission region TA, so the groove 250a is invisible to the observer.

[0139] Although not shown, in an exemplary embodiment of the present disclosure, the groove 250a may be provided to overlap with the non-transmission region NTA of the transparent display panel 100. In addition, the groove 250a of the light control panel 200 may be provided such that at least a part of the groove 250a overlaps with the light-emitting region of the transparent display panel 100. In addition, the groove 250a of the light control panel 200 may be provided such that at least a part of the groove 250a overlaps with the transistor T of the transparent display panel 100. In addition, the groove 250a of the light control panel 200 may be provided such that at least a part of the groove 250a overlaps with the color filter CF and the light blocking layer BM of the transparent display panel 100. As a result, a decrease in the light transmittance due to the aggregation of the charged particles 254a in the groove 250a during the transmission mode can be suppressed.

[0140] The groove 250a may extend in one direction. In an exemplary embodiment, the groove 250a may extend in the first direction (e.g., the X-axis direction). As an example, the groove 250a may extend parallel to the first signal line SL1. The groove 250a may be provided to extend parallel to the spacer 250b in the region corresponding to the non-transmission region NTA. For example, the groove 250a may be located between two adjacent spacers in the region corresponding to the non-transmission region NTA and provided to extend parallel to the spacer 250b. For example, the groove 250a is spaced apart from each of the two adjacent spacers by the same distance, but the present disclosure is not limited thereto, and the groove 250a may also be spaced apart from the two adjacent spacers by different distances.

[0141] The groove 250a has a first width W1, and the first width W1 may be smaller than the width of the dielectric pattern 250c, smaller than the distance between two adjacent spacers 250b, and smaller than the width of the non-transmission region NTA of the transparent display panel 100 in the first direction (e.g., the X-axis direction).

[0142] As a result, the light control panel 200 according to the exemplary embodiment of the present disclosure can prevent the groove 250a from overlapping with the transmissive area TA of the transparent display panel 100, and can also prevent the light transmittance of the transparent display device 10 from decreasing due to the charged particles 254a accumulated in the groove 250a during the transmissive mode.

[0143] In the exemplary embodiment, the dielectric pattern 250c, the spacer 250b, and the groove 250a included in the dielectric layer 250 may be integrally formed and may be formed of the same dielectric material. The dielectric pattern 250c, the spacer 250b, and the groove 250a included in the dielectric layer 250 may be simultaneously formed by an imprinting process. Therefore, the manufacturing process cost can be reduced, the manufacturing process can be simplified, the manufacturing process time can be shortened, and the production energy can also be reduced. In addition, since the light control panel 200 according to the exemplary embodiment of the present disclosure can reduce the manufacturing process, the greenhouse gases that may be generated during the manufacturing process can be reduced and environmental, social, and governance (ESG) can be achieved.

[0144] The adhesive layer 260 may be disposed between the second electrode 240 and the dielectric layer 250 to adhere the dielectric layer 250 to the second electrode 240. The adhesive layer may be a transparent adhesive film such as an optically clear adhesive (OCA) or a transparent adhesive such as an optically clear resin (OCR). The adhesive layer 260 may also have a certain dielectric constant.

[0145] The light control panel 200 may be implemented in the form of a thin film, but is not limited thereto.

[0146] Hereinafter, reference will be made to Figure 9A and Figure 9B and also Figure 10A 、 Figure 10B and Figure 10C to describe the light control panel 200 according to the second exemplary embodiment of the present disclosure. Compared with the light control panel 200 according to the exemplary embodiment of the present disclosure shown in Figures 1 to 8C , the light control panel 200 according to the second exemplary embodiment of the present disclosure has substantially the same configuration except for the first electrode 330. Hereinafter, the differences will be mainly described, and the description of the substantially same components will be omitted. The exemplary embodiment described below may be combined with or applied in combination with the structure of the exemplary embodiment of the present disclosure shown in Figures 1 to 8C .

[0147] In the Figure 7A of the first exemplary embodiment of the present disclosure, the first electrode 230 is a monolithic electrode, while in the Figures 9A to 10CIn [the above structure], the first electrode 330 may be divided into a plurality of strip patterns and formed in a direction intersecting with the extending direction of the dielectric groove 350a.

[0148] That is to say, when the dielectric groove 350a is formed in the X-axis direction, the strip-shaped first electrode 330 may be formed to extend in the Y-axis direction intersecting with the X-axis direction. Therefore, in the transmission mode, the charged particles 354a gather in the region where the groove 350a overlaps with the strip-shaped first electrode 330, thereby further improving the light transmittance.

[0149] Figure 9A and Figure 9B show the charged particles 354a, the light control panel 200, and the display panel 100 in the light blocking mode of the present disclosure.

[0150] When a voltage opposite to the charge of the charged particles 354a is applied to the strip-shaped second electrode 340, the charged particles 354a can move toward the second substrate 320 on which the second electrode 340 is formed, be evenly distributed, and can be dispersed. Since the light control panel 200 has a plurality of charged particles 354a distributed above the entire region where the second electrode 340 is provided, external light can be blocked by the plurality of charged particles 354a in the entire region to achieve the light blocking mode. The external light does not pass through the light control panel 200 and is not incident not only on the non-transmissive area NTA of the transparent display panel 100 but also on the transmissive area TA of the transparent display panel 100. When the charged particles 354a are bistable ink, a material having an electric charge amount is adsorbed onto the particles, and an additive having a specific functional group is also added to the solvent 354b so that it has a certain amount of charge. In this case, even when the voltage applied to the strip-shaped first electrode 330 and the second electrode 240 is cut off, bistability can be ensured by the attractive force between the charged particles 354a and the solvent 354b. Therefore, the charged particles 254a can maintain their state for a long holding period and maintain the set transmittance level. A light blocking layer 355 may also be formed between the upper part of the spacer 350b and the second electrode 340. In the light blocking mode, the light blocking layer 355 has the effect of suppressing the transmission of external light to the upper part of the spacer 350b.

[0151] Figure 10A is a front view showing the display panel 100 and the light control panel 200 in the transmission mode, Figure 10B is a cross-sectional view taken along line B-B' in the transmission mode, and Figure 10C shows a cross-sectional view taken along line A-A' in the transmission mode.

[0152] As Figure 10A , Figure 10B and Figure 10CAs shown, when a voltage opposite to the charge of the charged particles 354a is applied to the first electrode 330 in the transmission mode, the charged particles 354a move in the direction of the first electrode 330 along the electric field direction and aggregate in an island shape inside the groove 350a or on the top surface of the first electrode 330. That is, the charged particles 354a may not be distributed throughout the strip-shaped groove 350a, but may be distributed in the region where the first electrode 330 and the groove 350a intersect. For example, the charged particles 354a may be distributed only in the region where the first electrode 330 and the groove 350a intersect. In this case, external light may not pass through the region where the first electrode 330 and the groove 350a intersect with the plurality of charged particles 354a and may be blocked.

[0153] The groove 350a may extend in one direction. In an exemplary embodiment, the groove 350a may extend in a first direction (e.g., the X-axis direction). As an example, the groove 350a may extend parallel to the first signal line SL1. The groove 350a may be arranged to extend parallel to the spacer 350b in a region corresponding to the non-transmission region NTA. For example, the groove 350a may be located between two adjacent spacers and arranged to extend parallel to the spacer 350b in a region corresponding to the non-transmission region NTA. For example, the groove 350a is spaced the same distance from each of the two adjacent spacers, but the present disclosure is not limited thereto, and the groove 350a may also be spaced different distances from the two adjacent spacers.

[0154] The groove 350a has a second width W2, and the second width W2 may be less than the width of the dielectric pattern 350c, less than the distance between two adjacent spacers, and less than the width of the transmission unit. In addition, the second width W2 may be less than the width of the non-transmission region NTA of the transparent display panel 100 in the first direction (e.g., the X-axis direction).

[0155] As a result, the light control panel 200 according to the second exemplary embodiment of the present disclosure can prevent the groove 350a from overlapping with the transmission region TA of the transparent display panel 100, and can also prevent the light transmittance of the transparent display device 10 from decreasing due to the charged particles 354a aggregated in the groove 350a during the transmission mode.

[0156] External light passing through the upper part of the dielectric pattern 350c where the charged particles 354a are not distributed is incident on the display panel 100 and passes through the transmission region of the display panel 100. Therefore, the charged particles 354a can be seen in the form of islands in the transmission region TA, but the width of the groove 350a is small enough compared to the transmission region TA, so the groove 250a is not visible to the observer.

[0157] Although not shown, in a second exemplary embodiment of the present disclosure, the groove 350a may be provided to overlap with the non-transmissive area NTA of the transparent display panel 100. In addition, the groove 350a of the light control panel 200 may be provided such that at least a part of the groove 350a overlaps with the light-emitting area of the transparent display panel 100. In addition, the groove 350a of the light control panel 200 may be provided to partially overlap with the transistor T of the transparent display panel 100. In addition, the groove 350a of the light control panel 200 may be provided such that at least a part of the groove 350a overlaps with the color filter CF and the light-blocking layer BM of the transparent display panel 100. As a result, a reduction in light transmittance due to the accumulation of charged particles 354a in the groove 250a during the transmissive mode can be suppressed.

[0158] Hereinafter, reference will be made to Figure 11A , Figure 11B and Figure 11C to describe the light control panel 200 according to a third exemplary embodiment of the present disclosure. Compared with the light control panel 200 according to the second exemplary embodiment of the present disclosure shown in Figures 9A to 10C , the light control panel 200 according to the third exemplary embodiment of the present disclosure has substantially the same configuration except for the setting direction. Hereinafter, the differences will be mainly described, and the description of the substantially same components will be omitted. The exemplary embodiments described below may be combined with or applied in combination with the structure of the exemplary embodiments of the present disclosure shown in Figures 1 to 10C .

[0159] When the pixel units and the transparent portions of the display panel 100 according to the first exemplary embodiment and the second exemplary embodiment of the present disclosure shown in Figure 7A are provided to extend in the Y-axis direction, the grooves 250a and the spacers 250b of the light control panel 200 may be formed to extend in the X-axis direction orthogonal to the setting direction of the pixel units and the transmissive units. Therefore, an overlapping area may occur between the transmissive unit, the spacer 250b, and the groove 250a. On the other hand, in the third exemplary embodiment of the present disclosure, Figure 11A the pixel units and the transmissive units of the display panel 100 are provided to extend in the X-axis direction, and the grooves 450a and the spacers 450b are also formed to extend in the X-axis direction, which is the same as the setting direction of the pixel units and the transmissive units. In addition, the spacer 450b of the third exemplary embodiment of the present disclosure may be provided to overlap with the pixel units (i.e., the light-emitting units) in the same direction.

[0160] Figure 11BIt is a front view showing a pixel unit and a light control panel 200 of the third exemplary embodiment of the present disclosure in a light blocking mode. When a voltage opposite to the charge of the charged particles 454a is applied to the second electrode 440, the charged particles 454a can move toward the side of the second substrate 420 where the second electrode 440 is formed and be uniformly distributed, and can be dispersed. Since the light control panel 200 has a plurality of charged particles 454a distributed above the entire area where the second electrode 440 is provided, external light can be blocked by the plurality of charged particles 454a in the entire area to achieve the light blocking mode. The external light does not pass through the light control panel 200 and is not incident not only on the non-transmissive area NTA of the transparent display panel 100 but also on the transmissive area TA of the transparent display panel 100. When the charged particles 454a are bistable ink, a material having an electric charge amount is adsorbed onto the particles, and an additive having a specific functional group is also added to the solvent 454b so that it has a certain amount of charge. In this case, even when the voltage applied to the strip-shaped first electrode 430 and the second electrode 440 is cut off, bistability can be ensured by the attraction between the charged particles 454a and the solvent 454b, so that the charged particles 454a can maintain their state for a long holding period and maintain a set transmittance level. A light blocking layer 455 can also be formed between the upper part of the spacer 450b and the second electrode 440. In the light blocking mode, the light blocking layer 455 has the effect of suppressing the transmission of external light to the upper part of the spacer 450b. Since the spacer 450b and the pixel unit (non-transmissive unit) overlap and are provided in the same direction, the spacer 450b is not visible in the picture display direction.

[0161] Figure 11C It is a front view showing a pixel unit and a light control panel 200 of the third exemplary embodiment of the present disclosure in a transmissive mode. When a voltage opposite to the charge of the charged particles 454a is applied to the first electrode 430 in the transmissive mode, the charged particles 454a move in the direction of the first electrode 430 along the electric field direction and aggregate in an island shape inside the groove 450a or on the top surface of the first electrode 430. That is, the charged particles 454a may not be distributed in the entire strip-shaped groove 450a but may be distributed in the area where the first electrode 430 and the groove 450a intersect. For example, the charged particles 454a may be distributed only in the area where the first electrode 430 and the groove 450a intersect. In this case, external light may not pass through the area where the first electrode 430 and the groove 450a intersect with the plurality of charged particles 454a and may be blocked.

[0162] The groove 450a may be disposed to extend parallel to the spacer 450b in the region corresponding to the non-transmission area NTA. For example, the groove 450a may be located between two adjacent spacers in the region corresponding to the non-transmission area NTA and disposed to extend parallel to the spacer 450b. For example, the groove 450a is spaced apart from each of the two adjacent spacers by the same distance, but the present disclosure is not limited thereto, and the groove 450a may also be spaced apart from the two adjacent spacers by different distances.

[0163] The groove 450a has a second width W2, and the second width W2 may be smaller than the width of the dielectric pattern 450c, smaller than the distance between two adjacent spacers, and smaller than the width of the transmission unit. In addition, the second width W2 may be smaller than the width of the non-transmission area NTA of the transparent display panel 100 in the first direction (e.g., the X-axis direction).

[0164] As a result, the light control panel 200 according to the third exemplary embodiment of the present disclosure can suppress the overlap of the groove 450a with the transmission area TA of the transparent display panel 100, and can also suppress the transmittance of the transparent display device 10 from being reduced due to the charged particles 454a accumulated in the groove 450a during the transmission mode.

[0165] External light that passes through the upper portion of the dielectric pattern 450c where the charged particles 454a are not distributed is incident on the display panel 100 and passes through the transmission area of ​​the display panel 100. Therefore, the charged particles 454a may be visible in the form of islands in the transmission area TA, but the width of the groove 450a is sufficiently small compared to the transmission area TA, so the groove 450a is not visible to the observer.

[0166] The light control panel 200 according to the third exemplary embodiment of the present disclosure can suppress the spacer 450b from overlapping the transmission area TA of the transparent display panel 100, and can also suppress the transmittance of the transparent display device 10 from being reduced due to the charged particles 454a accumulated in the groove 450a during the transmission mode.

[0167] Figure 12A , Figure 12B and Figure 12C It is shown that the greater the voltage applied to the first electrode or the longer the time, the greater the transmittance, and the smaller the applied voltage or the shorter the time for which the voltage is applied, the smaller the transmittance.

[0168] That is, as the voltage applied to the first electrode increases, the charged particles 554a become more concentrated in the grooves, and as the applied voltage decreases, the force that causes the charged particles 554a to gather in the grooves becomes relatively smaller. Therefore, the charged particles 554a can be widely distributed in the grooves. Accordingly, as the applied voltage becomes smaller, the distribution area of the charged particles 554a may increase, and the transmittance may decrease.

[0169] Figure 13 Examples of adjusting the brightness to adapt to the external environment by applying the first exemplary embodiment to the third exemplary embodiment of the present disclosure to the display panel 100 and the light control panel 200 are shown. In other words, by simultaneously implementing a transmissive region and a shielding region on one screen, the light control panel 200 is divided and driven to adapt to user needs, thereby transmitting image information customized according to user needs and improving the visibility of the transparent display device.

[0170] The exemplary embodiments of the present disclosure can also be described as follows:

[0171] According to an exemplary embodiment of the present disclosure, the light control panel includes: a first electrode and a second electrode, the first electrode and the second electrode being arranged to face each other; and a dielectric layer and charged particles, the dielectric layer and the charged particles being disposed between the first electrode and the second electrode, wherein the dielectric layer is provided with one or more grooves, and the dielectric layer has a dielectric pattern provided between adjacent grooves and a plurality of spacers protruding toward the second electrode on a part of the top surface of the dielectric pattern.

[0172] The first electrode is divided into a plurality of unit electrodes.

[0173] Each of the plurality of unit electrodes is driven individually.

[0174] The plurality of unit electrodes are applied with voltages of different magnitudes.

[0175] The second electrode is formed as a common electrode.

[0176] The spacers have a bar shape extending in a first direction, and the grooves have a bar shape extending in the same direction as the spacers.

[0177] The spacers have a flat top surface, and a light blocking layer is coated on the top surface of the spacers.

[0178] The dielectric pattern, the spacers, and the grooves are integrally provided.

[0179] The grooves are provided between at least two of the plurality of spacers.

[0180] The first electrode and the second electrode are transparent electrodes, and the first electrode or the second electrode is arranged to overlap with the one or more grooves.

[0181] The first electrode includes a plurality of block electrodes that are divided into a plurality of blocks and each of the plurality of blocks is driven individually.

[0182] Each of the plurality of block electrodes of the first electrode includes a plurality of patterned electrodes in a patterned bar shape.

[0183] The first electrode includes a plurality of patterned electrodes each having the patterned bar shape.

[0184] The grooves are arranged in a direction intersecting with the plurality of patterned electrodes.

[0185] In the light transmission mode, the charged particles aggregate in an island shape or a bar shape on the patterned electrodes of the grooves.

[0186] Even when the cut-off voltage is applied at the first electrode and the second electrode, the charged particles still maintain their state for a specific period of time to achieve the light blocking mode or the light transmission mode.

[0187] According to an exemplary embodiment of the present disclosure, the transparent display device includes: a transparent display panel including a transmission region that transmits external light and a non-transmission region provided with a plurality of pixels; a first electrode and a second electrode arranged to face each other; and a dielectric layer and charged particles arranged between the first electrode and the second electrode, wherein the dielectric layer is provided with one or more grooves, and wherein the dielectric layer has a dielectric pattern provided between adjacent grooves and a plurality of spacers protruding toward the second electrode on a part of the top surface of the dielectric pattern.

[0188] The first electrode is divided into a plurality of unit electrodes, and each of the plurality of unit electrodes is driven individually.

[0189] The plurality of unit electrodes are applied with voltages of different magnitudes.

[0190] The second electrode is formed as a common electrode.

[0191] The one or more grooves are arranged to overlap with the non-transmission region of the transparent display panel.

[0192] The non-transmission region includes a light-emitting region provided with the plurality of pixels and emitting light, and at least a part of the one or more grooves is arranged to overlap with the light-emitting region of the transparent display panel.

[0193] The spacer has a bar shape extending in a first direction, and the groove has a bar shape extending in the same direction as the spacer.

[0194] The spacer has a flat top surface, and a light-blocking layer is coated on the top surface of the spacer.

[0195] The dielectric pattern, the spacer, and the groove are integrally provided.

[0196] The groove is provided between at least two of the plurality of spacers.

[0197] The first electrode and the second electrode are transparent electrodes, and the first electrode or the second electrode is provided to overlap with the one or more grooves.

[0198] The first electrode includes a plurality of block electrodes divided into a plurality of blocks and each of the plurality of blocks is individually driven.

[0199] Each of the plurality of block electrodes of the first electrode includes a plurality of patterned electrodes having a patterned bar shape.

[0200] The first electrode includes a plurality of patterned electrodes each having the patterned bar shape.

[0201] The groove is provided in a direction intersecting with the plurality of patterned electrodes.

[0202] In the light transmission mode, the charged particles aggregate in an island shape or a bar shape on the patterned electrodes of the groove.

[0203] Even when the cut-off voltage is applied to the first electrode and the second electrode, the charged particles still maintain their state for a specific period of time, and the light-blocking mode or the light transmission mode of the transparent display device is achieved.

[0204] The groove and the spacer are provided in a region corresponding to the transmission region.

[0205] The groove and the spacer are provided in a region corresponding to the non-transmission region.

[0206] The spacer is provided to overlap with the plurality of pixels in the non-transmission region.

[0207] The spacer and the groove extend in the same direction as the arrangement direction of the plurality of pixels in the non-transmission region.

[0208] Although the exemplary embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited thereto and can be implemented in many different forms without departing from the technical concept of the present disclosure. Therefore, the exemplary embodiments of the present disclosure are provided for illustrative purposes only and are not intended to limit the technical concept of the present disclosure. The scope of the technical concept of the present disclosure is not limited thereto. Accordingly, it should be understood that the above exemplary embodiments are illustrative in all respects and do not limit the present disclosure. All technical concepts within the equivalent scope of the present disclosure should be construed as falling within the scope of the present disclosure.

[0209] Cross - reference to related applications

[0210] This application claims the priority of Korean Patent Application No. 10 - 2023 - 0197837, filed with the Korean Intellectual Property Office on December 29, 2023, the entire contents of which are hereby incorporated herein by reference for all purposes.

Claims

1. A light control panel, comprising: a first electrode and a second electrode, the first electrode and the second electrode being arranged to face each other; as well as a dielectric layer and charged particles, the dielectric layer and the charged particles being arranged between the first electrode and the second electrode, Wherein, the dielectric layer is provided with one or more grooves, and The dielectric layer has a dielectric pattern disposed between adjacent grooves and a plurality of spacers protruding toward the second electrode on a portion of a top surface of the dielectric pattern.

2. The light control panel according to claim 1, wherein: The first electrode is divided into a plurality of unit electrodes, and Each of the plurality of unit electrodes is driven individually.

3. The light control panel according to claim 2, wherein: The plurality of unit electrodes are applied with voltages of different magnitudes.

4. The light control panel according to claim 2, wherein: The second electrode is formed as a common electrode.

5. The light control panel according to claim 1, wherein: The spacer has a strip shape extending in a first direction, and The groove has a stripe shape extending in the same direction as the spacer.

6. The light control panel according to claim 1, wherein: The spacer has a flat top surface, and a light blocking layer is coated on the top surface of the spacer.

7. The light control panel according to claim 1, wherein: The dielectric pattern, the spacer, and the groove are integrally provided.

8. The light control panel according to claim 1, wherein: The groove is disposed between at least two spacers among the plurality of spacers.

9. The light control panel according to claim 1, wherein: The first electrode and the second electrode are transparent electrodes, and The first electrode or the second electrode is disposed to overlap the one or more grooves.

10. The light control panel according to claim 1, wherein: The first electrode includes a plurality of block electrodes which are divided into a plurality of blocks and each of the plurality of blocks is driven individually.

11. The light control panel according to claim 10, wherein: Each of the plurality of block electrodes of the first electrode includes a plurality of patterned electrodes in a patterned strip shape.

12. The light control panel according to claim 1, wherein: The first electrode includes a plurality of patterned electrodes each having a patterned strip shape.

13. The light control panel according to claim 12, wherein: The groove is disposed in a direction intersecting the plurality of patterned electrodes.

14. The light control panel according to claim 13, wherein: In the light transmission mode, the charged particles are gathered in the shape of islands or strips on the patterned electrodes of the grooves.

15. The light control panel according to claim 1, wherein: In response to the voltage being turned off at the first electrode and the second electrode, the charged particles maintain their state for a period of time, and a light blocking mode or a light transmitting mode of the light control panel is implemented.

16. A transparent display device, comprising: A transparent display panel, the transparent display panel comprising a transmission area for transmitting external light and a non-transmission area provided with a plurality of pixels; a first electrode and a second electrode, the first electrode and the second electrode being arranged to face each other; and a dielectric layer and charged particles, the dielectric layer and the charged particles being arranged between the first electrode and the second electrode, Wherein, the dielectric layer is provided with one or more grooves, and The dielectric layer has a dielectric pattern disposed between adjacent grooves and a plurality of spacers protruding toward the second electrode on a portion of a top surface of the dielectric pattern.

17. The transparent display device according to claim 16, wherein: The first electrode is divided into a plurality of unit electrodes, and Each of the plurality of unit electrodes is driven individually.

18. The transparent display device according to claim 17, wherein: The plurality of unit electrodes are applied with voltages of different magnitudes.

19. The transparent display device according to claim 17, wherein: The second electrode is formed as a common electrode.

20. The transparent display device according to claim 16, wherein: The one or more grooves are disposed to overlap the non-transmission area of ​​the transparent display panel.

21. The transparent display device according to claim 16, wherein: The non-transmission area includes a light emitting area where the plurality of pixels are disposed and emits light, and Wherein, at least a portion of the one or more grooves is arranged to overlap with the light emitting area of ​​the transparent display panel.

22. The transparent display device according to claim 16, wherein: The spacer has a strip shape extending in a first direction, and The groove has a stripe shape extending in the same direction as the spacer.

23. The transparent display device according to claim 16, wherein: The spacer has a flat top surface, and a light blocking layer is coated on the top surface of the spacer.

24. The transparent display device according to claim 16, wherein: The dielectric pattern, the spacer, and the groove are integrally provided.

25. The transparent display device according to claim 16, wherein: The groove is disposed between at least two spacers among the plurality of spacers.

26. The transparent display device according to claim 16, wherein: The first electrode and the second electrode are transparent electrodes, and The first electrode or the second electrode is disposed to overlap the one or more grooves.

27. The transparent display device according to claim 16, wherein: The first electrode includes a plurality of block electrodes which are divided into a plurality of blocks and each of the plurality of blocks is driven individually.

28. The transparent display device according to claim 27, wherein: Each of the plurality of block electrodes of the first electrode includes a plurality of patterned electrodes in a patterned strip shape.

29. The transparent display device according to claim 16, wherein: The first electrode includes a plurality of patterned electrodes each having a patterned strip shape.

30. The transparent display device according to claim 29, wherein: The groove is disposed in a direction intersecting the plurality of patterned electrodes.

31. The transparent display device according to claim 29, wherein: In the light transmission mode, the charged particles are gathered in the shape of islands or strips on the patterned electrodes of the grooves.

32. The transparent display device according to claim 16, wherein: In response to the voltage being turned off at the first electrode and the second electrode, the charged particles maintain their state for a period of time, and a light blocking mode or a light transmitting mode of the transparent display device is implemented.

33. The transparent display device according to claim 16, wherein: The groove and the spacer are disposed in a region corresponding to the transmission region.

34. The transparent display device according to claim 16, wherein: The groove and the spacer are disposed in a region corresponding to the non-transmission region.

35. The transparent display device according to claim 16, wherein: The spacer is disposed to overlap the plurality of pixels in the non-transmission area.

36. The transparent display device according to claim 16, wherein: The spacer and the groove extend in the same direction as a direction in which the plurality of pixels in the non-transmission area are arranged.

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