Light control panel and transparent display device comprising same

Abstract

The invention discloses a light control panel and a transparent display device including the same. A light control panel may include a first electrode and a second electrode disposed facing each other, and a dielectric layer disposed between the first electrode and the second electrode. The dielectric layer may include: a first dielectric including a first dielectric material and a recess, the first dielectric material having a first dielectric constant; and a second dielectric comprising a plurality of light blocking particles and a solvent, the solvent comprising a second dielectric material, the second dielectric material having a second dielectric permittivity less than the first dielectric permittivity. The first dielectric may include a first dielectric pattern disposed between adjacent recesses. The first dielectric may also include a protrusion in which a portion of the top surface of the first dielectric pattern protrudes toward the second electrode.

Description

Technical Field

[0001] The present disclosure relates to a display device, and in particular, for example but not limited to, to a light control panel and a transparent display device including the light control panel. More specifically, the present disclosure relates to a light control panel and a transparent display device capable of improving display quality. Background Art

[0002] With the development of information society, the demand for display devices for displaying images has increased in various forms. Recently, various types of display devices such as liquid crystal display (LCD) devices, plasma display panel (PDP) devices, quantum dot light emitting displays (QLED) and organic light emitting display (OLED) devices have been widely used.

[0003] In particular, organic light emitting display (OLED) devices have attracted attention as next-generation display devices because they have advantages not only in power consumption due to low-voltage operation but also in color reproduction, response speed, viewing angle, and contrast.

[0004] Display devices having a transmissive region to allow external light to pass therethrough so that a background scene behind the transparent display device or an object or image on a rear surface of the transparent display device can be seen through the transparent display device are now actively being developed. Summary of the invention

[0005] In one or more aspects, the present disclosure is directed to providing a light control panel capable of realizing a light blocking mode for blocking light and a light transmitting mode for transmitting light, and a transparent display device including the light control panel.

[0006] One aspect of the present disclosure relates to a light control panel capable of selectively implementing a light blocking mode for blocking light to improve display clarity and a light transmitting mode for transmitting light to allow visual recognition of a background scene of a display panel, and a transparent display device including the light control panel.

[0007] Another aspect of the present disclosure relates to a light control panel capable of improving light transmittance in a light transmission mode and a transparent display device including the light control panel.

[0008] Another aspect of the present disclosure relates to a light control panel capable of extending the lifespan and a transparent display device including the light control panel, thereby improving ESG (environmental / social / governance) quality by extending the lifespan of the display device and reducing the generation of greenhouse gases associated with the manufacturing process of the display device.

[0009] Additional aspects, advantages and features of the present disclosure will be partially described in the following description, and for those of ordinary skill in the art, some of the content will become obvious after studying the present disclosure, or can be learned from the practice of the present disclosure. Other aspects, advantages and features of the present disclosure can be realized and obtained through the description provided in the present disclosure including the drawings.

[0010] To achieve these and other advantages and aspects of the present disclosure, as embodied and broadly described herein, in one aspect or more aspects, a light control panel is provided, comprising: a first electrode and a second electrode disposed facing each other, and a dielectric layer disposed between the first electrode and the second electrode, wherein the dielectric layer comprises: a first dielectric comprising a first dielectric material and a groove, the first dielectric material having a first dielectric constant; and a second dielectric comprising a plurality of light-blocking particles and a solvent, the solvent comprising a second dielectric material, the second dielectric constant of the second dielectric material being less than the first dielectric constant, and wherein the first dielectric comprises a first dielectric pattern disposed between adjacent grooves, and wherein the first dielectric further comprises a protrusion in which a portion of a top surface of the first dielectric pattern protrudes toward the second electrode.

[0011] In one or more aspects of the present disclosure, there is a transparent display device, which includes: a transparent display panel, which includes a transmission area for transmitting external light and a non-transmission area on which a plurality of pixels are arranged; and a light control panel, which includes a first electrode, a second electrode and a dielectric layer arranged between the first electrode and the second electrode, wherein the dielectric layer includes: a first dielectric, which includes a first dielectric material having a first dielectric constant, the first dielectric also including a groove; and a second dielectric, which includes a plurality of light-blocking particles and a solvent, the solvent includes a second dielectric material, the second dielectric constant of the second dielectric material is less than the first dielectric constant, and wherein the first dielectric includes a first dielectric pattern arranged between adjacent grooves, and wherein the first dielectric also includes a protrusion in which a portion of a top surface of the first dielectric pattern protrudes toward the second electrode.

[0012] In one or more aspects of the present disclosure, there is a transparent display device, which includes: a transparent display panel, which includes a transmission area for transmitting external light and a non-transmission area on which a plurality of pixels are arranged; and a light control panel, which includes a dielectric layer, wherein the dielectric layer includes a plurality of light-blocking particles that can move; the light control panel is configured to operate in a light-blocking mode or a light-transmitting mode; and for the light-transmitting mode, the light control panel is configured to move the plurality of light-blocking particles to an area corresponding to the non-transmitting area.

[0013] According to one or more aspects of the present disclosure, the protrusion has an inclined side surface in a regular conical shape.

[0014] According to one or more aspects of the present disclosure, the protrusion has a flat top surface.

[0015] According to one or more aspects of the present disclosure, a horizontal distance between a first point of a top surface of the first dielectric pattern and a second point of a top surface of the protrusion is less than a vertical distance which is a height of the protrusion, the first point being a point where the top surface of the first dielectric pattern intersects with one end of a side surface of the protrusion, and the second point being a point where the top surface of the protrusion intersects with the other end of the side surface of the protrusion.

[0016] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are examples, and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of the present disclosure. The accompanying drawings illustrate aspects and embodiments of the present disclosure and together with the description are used to explain the principles and examples of the present disclosure. In the drawings:

[0018] Figure 1 is a perspective view illustrating a transparent display device according to one or more exemplary embodiments of the present disclosure;

[0019] Figure 2 is a plan view illustrating a transparent display panel according to one or more embodiments of the present disclosure;

[0020] Figure 3 It is an example Figure 2 A diagram showing an example of a transmissive region and a non-transmissive region provided in a display area of ​​;

[0021] Figure 4 yes Figure 3 An example of a circuit diagram of a sub-pixel is shown;

[0022] Figure 5 yes Figure 3 An example of a cross-sectional view of an example of II′;

[0023] Figure 6 is a perspective view illustrating a light control panel according to one or more exemplary embodiments of the present disclosure;

[0024] Figure 7 In light blocking mode Figure 6 A cross-sectional view of an example of one side of the;

[0025] Figure 8 is a cross-sectional view illustrating an example of an arrangement relationship between components of a transparent display panel and components of a light control panel;

[0026] Fig. 9 This is an example of the light transmission mode. Figure 6 A cross-sectional view of an example of one side;

[0027] Fig.10 It is an example Fig. 9 A plan view of an example of a spacer, a first dielectric pattern, and a groove is shown;

[0028] Fig.11 yes Fig. 9 An example of an enlarged view of a portion of a PT is shown in;

[0029] Fig. 12A is a diagram for explaining polarization density according to an experimental example;

[0030] Fig. 12B is a diagram for explaining polarization density according to the present disclosure;

[0031] Fig.13 This is an example of the light blocking mode. Figure 6 A cross-sectional view of another example of one side of;

[0032] Fig.14 This is an example of the light blocking mode. Figure 6 A cross-sectional view of another example of one side of;

[0033] Fig.15 This is an example of the light transmission mode. Figure 6 A cross-sectional view of another example of one side of; and

[0034] Fig.16 It is an example Fig.14 A plan view of another example of a spacer, a first dielectric pattern, and a groove is shown. DETAILED DESCRIPTION

[0035] Hereinafter, various aspects of the present disclosure will be described in detail with reference to the accompanying drawings. The following aspects are provided in an exemplary manner so that the spirit of the present disclosure can be fully conveyed to those skilled in the art. Therefore, the present disclosure can be embodied in different forms and should not be interpreted as being limited to the various aspects set forth herein.

[0036] For the sake of convenience, the size and thickness of the device disclosed in the drawings may be exaggerated. The proportions of the components shown in the drawings are only examples, and thus the present disclosure is not limited to the proportions shown. Like reference numerals refer to like elements throughout.

[0037] In the following description, when the detailed description of the related art is determined to unnecessarily obscure the important points of the present disclosure, the detailed description will be omitted.

[0038] In the case of “including,” “having,” and “comprising” described in the present disclosure, another component may be added. Unless mentioned otherwise, the terms in the singular form may include the plural form.

[0039] When describing a positional relationship, for example, when the positional relationship between two parts is described as "on", "above", "below", and "beside", unless "just" or "directly" is used, one or more other parts may be arranged between the two parts. Spatially relative terms "below", "below", "below", "above", "above", etc. can be used to facilitate the description of the relationship between one element (or component) and another element (or component) as shown in the drawings. Spatially relative terms should be understood to include different element orientations in use or operation in addition to the orientations shown in the drawings. For example, when the elements shown in the drawings are reversed, an element described as being "below" or "below" another element can be placed "on" another element. Therefore, the exemplary term "below" can include both a downward direction and an upward direction.

[0040] It will be understood that although the terms "first", "second", "A", "B", "(a)", "(b)", etc. may be used herein to describe various elements of the present disclosure. These terms are only used to distinguish one element from another, and the nature, sequence, order or number of these elements should not be limited by these terms.

[0041] When assigning reference numerals to components in each figure, the same components may have the same reference numerals as much as possible even if they are shown in different figures. In addition, when the detailed description of the related art is determined to unnecessarily obscure the key points of the present disclosure, the detailed description will be omitted.

[0042] As those skilled in the art can fully understand, the features of various aspects of the present disclosure can be partially or completely connected or combined with each other, and can interoperate with each other in various ways and be technically driven. Various aspects of the present disclosure can be implemented independently of each other, or can be implemented together in a mutually dependent relationship.

[0043] Hereinafter, with reference to the accompanying drawings and embodiments, a display device according to the present disclosure is described as follows.

[0044] Figure 1 is a perspective view illustrating a transparent display device according to one or more embodiments of the present disclosure.

[0045] exist Figure 1 and Figure 2 In FIG. 1 , 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 a height direction of the display device.

[0046] Although the transparent display device 10 according to one or more exemplary embodiments of the present disclosure is described as an organic light emitting display device (OLED), the transparent display device 10 may be implemented as a liquid crystal display (LCD) device, a quantum dot light emitting display (QLED) device, or an electrophoretic display device, and is not limited thereto.

[0047] Reference Figure 1 , a transparent display device 10 according to one or more exemplary embodiments of the present disclosure includes a transparent display panel 100 and a light control panel 200 .

[0048] The transparent display panel 100 is provided with a plurality of pixels to display an image. The transparent display panel 100 may include a transmissive region in at least some regions. The transmissive region may allow most of the light incident from the outside to pass through. The transmissive region may be provided between a plurality of pixels. The transparent display panel 100 allows an external object or a background scene to be visible due to the transmissive region.

[0049] The light control panel 200 may be disposed on at least one side of the transparent display panel 100, and may control light incident on the transparent display panel 100. The light control panel 200 may include an electrophoretic element that moves by an electric field. The light control panel 200 may control the movement of the electrophoretic element to achieve a light blocking mode and a light transmitting mode. The electrophoretic element may switch from a light blocking mode to a light transmitting mode, or from a light transmitting mode to a light blocking mode, depending on whether a voltage is applied. The light control panel 200 may block incident light in the light blocking mode, and transmit incident light in the light transmitting mode.

[0050] The light control panel 200 may be preferably arranged in a direction opposite to the light emission direction of the transparent display panel 100. Figure 1 As shown, when the transparent display panel 100 is a top emission type, the light control panel 200 may be disposed below the transparent display panel 100. For another example, when the transparent display panel 100 is a bottom emission type, the light control panel 200 may be disposed above the transparent display panel 100.

[0051] The light control panel 200 may be adhered to one surface of the transparent display panel 100 using an adhesive layer. 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.

[0052] exist Figure 1In the embodiment, it is illustrated that the light control panel 200 is disposed on one surface of the transparent display panel 100 exposed to the outside, but it is not necessarily limited to this. 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 on the top surface of any 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 substrate and the transistor of the transparent display panel 100. For this example, the light control panel 200 may not include a separate substrate.

[0053] In the following, reference will be made to Figures 2 to 5 The transparent display panel 100 is described in more detail. Figure 2 is a plan view illustrating a transparent display panel according to one or more exemplary embodiments of the present disclosure, Figure 3 This is an example of setting Figure 2 FIG. 1 is a diagram showing an example of a transmissive region and a non-transmissive region in a display area, Figure 4 yes Figure 3 An example of a circuit diagram of a sub-pixel is shown in Figure 5 It is an example Figure 3 An example of a cross-sectional view of an example of II′.

[0054] Reference Figures 2 to 5 , the transparent display panel 100 according to one or more exemplary embodiments of the present disclosure may include a display area DA and a non-display area NDA. The display area DA includes pixels P to display an image, while the non-display area NDA does not display an image.

[0055] The display area DA may include a first signal line SL1, a second signal line SL2, and pixels. The non-display area NDA may include a pad area PA in which pads are arranged and at least one scan driver 205.

[0056] The first signal line SL1 may extend along a first direction (eg, Y-axis direction) in the display area DA. For example, the first signal line SL1 may be a data line, but is not necessarily limited thereto. The first signal line SL1 may include at least one of a pixel power line, a common power line, and a reference line.

[0057] The second signal line SL2 may extend along a second direction (eg, X-axis direction) in the display area DA. The second signal line SL2 may cross the first signal line SL1 in the display area DA. For example, the second signal line SL2 may be a scan line, but is not necessarily limited thereto.

[0058] The scan driver 205 is connected to the scan line and provides a scan signal. The scan driver 205 may be disposed in a non-display area NDA outside one or both sides of the display area DA of the transparent display panel 100. The scan driver 205 may be formed using a gate in panel GIP method or a tape automated packaging TAB method.

[0059] like Figure 3 As 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. 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 have a transmittance greater than α%, and the non-transmissive area NTA may have a transmittance less than β%. In this example, α is greater than β, and α and β may each be a positive number. Due to the transmissive area TA of the transparent display panel 100, the transparent display device 10 may allow viewing of an object or background scene located at the rear surface of the transparent display device 10.

[0060] The non-transmission area NTA includes a light emitting area EA in which a plurality of pixels P are arranged to emit light. 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.

[0061] For example, the first to fourth light emitting areas EA may emit light of different colors. 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. However, this is not necessarily limited to this. In addition, the arrangement order of each sub-pixel SP1, SP2, SP3, and SP4 may be changed in various ways.

[0062] Reference Figure 4 , each of the sub-pixels 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.

[0063] The switching transistor SW supplies a data signal supplied via the data line DL to the first node N1 in response to a scan signal supplied via the gate line GL. The capacitor Cst is electrically connected to the first node N1 to charge a voltage applied to the first node N1. The driving transistor DR may control the amount of driving current flowing to the organic light emitting diode OLED in response to a voltage applied to the gate electrode.

[0064] The semiconductor layer of the switch transistor SW and / or the drive transistor DR may include, but is not limited to, silicon such as a-Si, polycrystalline silicon (poly-Si), or low temperature polycrystalline silicon Si, or may include oxide such as indium gallium zinc oxide IGZO.

[0065] The organic light emitting diode OLED outputs light corresponding to the 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 may include an anode electrode, a light emitting layer formed on the anode electrode and a cathode electrode to which a common voltage is applied. The light emitting layer may be implemented to emit light of the same color, such as white light, for each pixel, or may be implemented to emit light of different colors, such as red light, green light or blue light, for each pixel.

[0066] The compensation circuit CC may be provided in the pixel to compensate for the threshold voltage of the driving transistor DR. The compensation circuit CC may include one or more transistors. The compensation circuit CC may include one or more transistors and a capacitor, and may be constructed in various ways according to the compensation method. The pixel including the compensation circuit CC may have various structures, such as 3T1C, 4T2C, 5T2C, 6T1C, 6T2C, 7T1C, 7T2C, etc.

[0067] Reference Figure 5 The transparent display panel 100 according to one or more exemplary embodiments of the present disclosure includes a lower substrate 111 and an upper substrate 112 facing each other. The transistor T and the light emitting device E may be disposed between the lower substrate 111 and the upper substrate 112. The light emitting device E may include a lower electrode E1, an organic layer EL, and an upper electrode E2.

[0068] The transistor T may include an active layer ACT disposed on the lower substrate 111, a first insulating film I1 disposed on the active layer ACT, a gate electrode GE disposed on the first insulating film I1, a second insulating film I2 disposed on the gate electrode GE, a source electrode SE, and a drain electrode DE. The source electrode SE and the drain electrode DE are disposed on the second insulating film I2 and are connected to the active layer ACT through a first contact hole CNT1 and a second contact hole CNT2. Figure 5 In the embodiment, it is illustrated that the transistor T is a top gate type, but it is not necessarily limited thereto, and the transistor T may be a bottom gate type in which the gate electrode GE is disposed below the active layer ACT.

[0069] The planarization film PLN may be disposed on the transistor T to planarize the step difference caused by the transistor T and the plurality of signal lines. The planarization film PLN is disposed in the non-transmission area NTA and cannot be disposed in at least a portion of the transmission area TA. The planarization film PLN may refract light when the light passes through, thereby impairing transparency. Therefore, the transparent display panel 100 according to the exemplary embodiment of the present disclosure may improve transparency by removing a portion of the planarization film PLN from the transmission area TA.

[0070] In addition, Figure 5 In the example, the first insulating film I1 and the second insulating film I2 disposed under the planarization film PLN are not only disposed in the non-transmission area NTA but also disposed in the transmission area TA, but are not necessarily limited thereto. In another exemplary embodiment, some insulating films disposed under the planarization film PLN may not be disposed in at least a portion of the transmission area TA to improve transparency. For example, the second insulating film I2 may be disposed in the non-transmission area NTA but may not be disposed in at least a portion of the transmission area TA.

[0071] The bank 125 and the light emitting device E including the lower electrode E1 , the organic layer EL, and the upper electrode E2 may be disposed on the planarization film PLN.

[0072] A lower electrode E1 may be provided on the planarization film PLN for each of the sub-pixels SP1, SP2, SP3, and SP4, and the lower electrode E1 may not be provided in the transmission area 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 PLN. The bank 125 is provided between adjacent lower electrodes E1 so that the adjacent lower electrodes E1 may be electrically insulated from each other.

[0073] The lower electrode E1 may include a highly reflective metal material, such as a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and ITO (ITO / Al / ITO), an Ag alloy, a laminated structure of an Ag alloy and ITO (ITO / Ag alloy), a MoTi alloy, and / or a laminated structure of a MoTi alloy and ITO (ITO / MoTi alloy / ITO). The Ag alloy may be an alloy of silver Ag, palladium Pd, and copper Cu. The MoTi alloy may be an alloy of molybdenum Mo and titanium Ti. The lower electrode E1 may be an anode electrode.

[0074] The bank 125 may be disposed on the planarization film PLN. In addition, the bank 125 may be disposed to cover the edge of the lower electrode E1 and expose a portion of the lower electrode E1. Therefore, the bank 125 can reduce or prevent the problem of reducing light emission efficiency due to current concentration at the end of the lower electrode E1.

[0075] The organic layer EL may be disposed on the lower electrode E1. The organic layer EL may 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 toward the light emitting layer through the hole transport layer and the electron transport layer, respectively, and recombine with each other in the light emitting layer to emit light. In an exemplary embodiment, the organic layer EL may be a common layer formed together in the sub-pixels SP1, SP2, SP3, and SP4. At this time, the light emitting layer may be a white light emitting layer that emits white light. In another exemplary embodiment, the light emitting layer of the organic layer EL cannot be formed in the transmission area TA.

[0076] The upper electrode E2 may be disposed on the organic layer EL and the bank 125. The upper electrode E2 may be made of a transparent metal material (TCO, transparent conductive material) such as ITO or IZO that can transmit light, or may be made of a translucent conductive material such as magnesium Mg, silver Ag, or an alloy of magnesium Mg and silver Ag. When the upper electrode E2 is made of a translucent conductive material, the light emitting efficiency can be improved due to the presence of the microcavity. The upper electrode E2 may be a cathode electrode.

[0077] The packaging film 140 may be disposed on the light emitting device E. The packaging film 140 may be formed on the upper electrode E2 to cover the upper electrode E2. The packaging film 140 is used to reduce or prevent oxygen or moisture from penetrating into the organic layer EL and the upper electrode E2. To this end, the packaging film 140 may include at least one inorganic film and at least one organic film.

[0078] The color filter CF may be disposed on one side of the upper substrate 112 facing the lower substrate 111. The color filter CF may be patterned for each of the sub-pixels SP1, SP2, SP3, and SP4.

[0079] 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 area 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 area 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 area 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 area EA4 of the fourth sub-pixel SP4, and may be a white color filter that transmits white light. The white color filter may be made of a transparent organic material that transmits white light, but is not necessarily limited thereto.

[0080] The light blocking layer 114 may be disposed between the color filters CF. The light blocking layer 114 is disposed between the sub-pixels SP1, SP2, SP3, and SP4 to reduce or prevent color mixing between adjacent sub-pixels SP1, SP2, SP3, and SP4. In addition, the light blocking layer 114 can reduce or prevent light incident from the outside from being reflected on a plurality of signal lines disposed between the sub-pixels SP1, SP2, SP3, and SP4.

[0081] In addition, the light blocking layer 114 is disposed between the transmission area TA and the plurality of sub-pixels SP1, SP2, SP3, and SP4 to reduce or prevent light emitted from each of the plurality of sub-pixels SP1, SP2, SP3, and SP4 from advancing to the transmission area TA. In an exemplary embodiment, the light blocking layer 114 cannot be disposed between the white sub-pixel and the transmission area TA. The display panel 110 according to the exemplary embodiment of the present disclosure does not include the light blocking layer 114 between the white sub-pixel and the transmission area TA, thereby reducing the area in which the light blocking layer 114 is formed. Thus, the display panel 110 according to the exemplary embodiment of the present disclosure can improve light transmittance. The light blocking layer 114 may include a material that absorbs light, such as a black dye that absorbs all light in the visible light wavelength range. The light blocking layer 114 may be a blocking matrix BM (block matrix).

[0082] The above-mentioned color filter CF and the light blocking layer 114 are not disposed in the transmission area TA to maintain high light transmittance in the transmission area TA.

[0083] The lower substrate 111 may be a plastic film, a glass substrate, or a silicon wafer substrate formed using a semiconductor process. 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 made of a transparent material. The lower substrate 111 may be formed to be larger than the upper substrate 112, and as a result, a portion of the lower substrate 111 may be exposed without being covered by the upper substrate 112.

[0084] As described above, the transparent display device 10 according to the exemplary embodiment of the present disclosure includes the transmission area TA that allows most of the light incident from the outside to pass through and the light emitting area EA that emits the light. As a result, in the exemplary embodiment of the present disclosure, an object or a background scene located on the rear surface or the front surface of the transparent display device 10 can be seen through the transmission area TA of the transparent display device 10.

[0085] Figure 6 is a perspective view illustrating a light control panel according to one or more exemplary embodiments of the present disclosure.

[0086] Reference Figures 6 to 12B According to the exemplary embodiment of the present disclosure, the light control panel 200 can be implemented to operate in a light transmission mode for transmitting incident light and a light blocking mode for blocking incident light. In the exemplary embodiment of the present disclosure, it can be assumed that the light blocking mode is a case where the light transmittance of the light control panel 200 is less than α%, and the light transmission mode is a case where the light transmittance of the light control panel 200 is equal to or greater than α%. In this example, α can be less than And α and The light transmittance of the light control panel 200 represents the ratio of light output to light incident on the light control panel 200 .

[0087] For this reason, Figure 6 As shown, the light control panel 200 according to the exemplary embodiment of the present disclosure includes a first substrate 210, a first electrode 230 on the first substrate 210, a second substrate 220 facing the first substrate, a second electrode 240 on the first substrate 210, and a dielectric layer 250 between the first electrode 230 and the second electrode 240. The light control panel 200 may further include an adhesive layer 260 between the dielectric layer 250 and the second electrode 240.

[0088] Each of the first substrate 210 and the second substrate 220 may be a glass substrate or a plastic film. When each of the first substrate 210 and the second substrate 220 is a plastic film, a cellulose resin (such as triacetyl cellulose TAC or diacetyl cellulose DAC, etc.), a cycloolefin polymer COP (such as norbornene derivatives, etc.), an acrylic resin (such as cycloolefin copolymer COC or polymethyl methacrylate PMMA, etc.), a polyolefin (such as polycarbonate PC, polyethylene PE or polypropylene PP, etc.), a polyester (such as polyvinyl alcohol PVA, polyether sulfone PES, polyether ether ketone PEEK, polyether imide PEI, polyethylene naphthalate PEN or polyethylene terephthalate PET, etc.), a sheet or film containing polyimide PI, polysulfone PSF or a fluoride resin, etc. may be used, but it is not necessarily limited thereto.

[0089] like Figure 1 and Figure 7 As 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 as a film type and disposed on one side of the transparent display panel 100 using a separate adhesive layer, but is not necessarily limited thereto.

[0090] In another exemplary embodiment, the light control panel 200 may be disposed within the transparent display panel 100. 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 may be omitted in the light control panel 200.

[0091] The first electrode 230 may be disposed on a side of the first substrate 210 facing the second substrate 220. The second electrode 240 may be disposed on a side of the second substrate 220 facing the first substrate 210. Each of the first electrode 230 and the second electrode 240 may be formed as an integral electrode overlapping the entire display area DA of the transparent display panel 100. In contrast, when each of the first electrode 230 and the second electrode 240 is formed of a plurality of pattern electrodes, expensive pattern electrode processing costs may be incurred, and light-blocking particles may be aggregated as the electric field is concentrated at both ends of the pattern electrode. In addition, since the plurality of pattern electrodes must be controlled individually, the driving circuit is complicated.

[0092] Since the light control panel 200 according to the exemplary embodiment of the present disclosure includes each of the first electrode 230 and the second electrode 240 formed as an integral electrode, it is not necessary to process into a plurality of electrode patterns, thereby reducing the electrode processing cost. In addition, it is not necessary to control each of the plurality of electrode patterns separately, thereby simplifying the driving circuit. In addition, since the first electrode 230 and the second electrode 240 are formed as an integral electrode, there is no patterning in the area overlapping with the display area DA of the transparent display panel 100, so it is possible to reduce or prevent the light-blocking particles from agglomerating due to the electric field concentrated at both ends of the electrode pattern.

[0093] Each of the first electrode 230 and the second electrode 240 may be a transparent electrode. Each of the first electrode 230 and the second electrode 240 may include silver oxide (e.g., AgO or Ag2O or Ag2O3), aluminum oxide (e.g., Al2O3), tungsten oxide (e.g., WO2 or WO3 or W2O3), magnesium oxide (e.g., MgO), molybdenum oxide (e.g., MoO3), zinc oxide (e.g., ZnO), tin oxide (e.g., SnO2), indium oxide (e.g., In2O3), chromium oxide (e.g., CrO3 or Cr2O3), antimony oxide (e.g., Sb2O3 or Sb2O5), titanium oxide (e.g., Sb2O3 or Sb2O5), or the like. Such as TiO2), nickel oxide (such as NiO), copper oxide (such as CuO or Cu2O), vanadium oxide (such as V2O3 or V2O5), cobalt oxide (such as CoO), iron oxide (such as Fe2O3 or Fe3O4), niobium oxide (such as Nb2O5), indium tin oxide (such as indium tin oxide, ITO), indium zinc oxide (such as indium zinc oxide, IZO), aluminum-doped zinc oxide (such as ZAO), aluminum-doped tin oxide (such as TAO) or antimony tin oxide (such as ATO), but it is not necessarily limited to these.

[0094] like Figures 7 to 9 As shown, the dielectric layer 250 is disposed between the first electrode 230 and the second electrode 240 to realize the light blocking mode or the light transmission mode depending on whether a voltage is applied to the first electrode 230 and the second electrode 240. For example, when a voltage is applied to the first electrode 230 and the second electrode 240, the dielectric layer 250 can realize the light transmission mode (see Fig. 9 On the other hand, when no voltage is applied to the first electrode 230 and the second electrode 240, the dielectric layer 250 may realize a light blocking mode (see Figure 7 and Figure 8 ).

[0095] The dielectric layer 250 may include a first dielectric 252 and a second dielectric 254. The first dielectric 252 and the second dielectric 254 may be made of different dielectric materials. The light control panel 200 according to the exemplary embodiment of the present disclosure may control the direction of the electric field in a desired direction by utilizing the shape of the interface between the first dielectric 252 and the second dielectric 254 and the dielectric constant difference between the first dielectric 252 and the second dielectric 254.

[0096] Specifically, the first dielectric 252 is disposed on a side of the first electrode 230 facing the second electrode 240. The first dielectric 252 may be made of a first dielectric material having a first dielectric constant. The first dielectric 252 may include a first dielectric pattern 252a, a spacer 252b, a groove 252c, and a protrusion 253 on the first dielectric pattern 252a.

[0097] The first dielectric pattern 252a may guide the plurality of light-blocking particles 254b included in the second dielectric 254 to the groove 252c disposed between the first dielectric patterns 252a. Specifically, the protrusion 253 may be disposed on the top surface of the first dielectric pattern 252a. The protrusion 253 may be a portion of the top surface of the first dielectric pattern 252a that protrudes toward the second electrode 240. At this time, the top surface of the first dielectric pattern 252a adjacent to the protrusion 253 may be flat. The protrusion 253 may be disposed at the center of the top surface of the first dielectric pattern 252a.

[0098] In this case, when a voltage is applied to the first electrode 230 and the second electrode 240, dielectric polarization occurs in the first dielectric material of the first dielectric pattern 252a, and the dielectric polarization density may vary depending on the shape of the top surface of the first dielectric pattern 252a. Therefore, due to the protrusion 253 of the first dielectric pattern 252a, an electric field may be generated in a direction inclined toward the groove 252c.

[0099] The plurality of light-blocking particles 254b included in the second dielectric 254 may be moved by an 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, as shown in FIG. Fig. 9 As shown, the plurality of light-blocking particles 254b can move toward the groove 252c along the direction of the electric field. Therefore, when a voltage is applied to the first electrode 230 and the second electrode 240, the plurality of light-blocking particles 254b cannot be arranged on (or above) the area where the first dielectric pattern 252a is arranged, and the area where the first dielectric pattern 252a is arranged can have a high light transmittance. Therefore, when a voltage is applied to the first electrode 230 and the second electrode 240, external light can pass through the area where the first dielectric pattern 252a is arranged, and therefore, the light passing through the light control panel 200 can be incident on the transparent display panel 100.

[0100] A distance between a center of one first dielectric pattern 252 a and a center of another adjacent first dielectric pattern 252 a may be a first distance d1. The first distance d1 may be equal to a distance from a center of one protrusion 253 to a center of another adjacent protrusion 253.

[0101] Reference Fig.11, the protrusion 253 on the first dielectric pattern 252a may protrude from the flat top surface (b) of the first dielectric pattern 252a toward the second electrode 240 to have a predetermined thickness or a predetermined height S2. The side surface (S) of the protrusion 253 may be inclined at a predetermined angle α from the flat top surface (b) of the first dielectric pattern 252a. The top surface (a) of the protrusion 253 may be flat. The side surface (S) of the protrusion 253 may have a regular tapered shape.

[0102] In this case, a horizontal distance S1 between the first point P1 and the second point P2 may be smaller than a vertical distance S2 which is the height of the protrusion 253. The first point P1 is a point where the top surface (b) of the first dielectric pattern 252a intersects with one end of the side surface (S) of the protrusion 253. The second point P2 is a point where the top surface (a) of the protrusion 253 intersects with the other end of the side surface (S) of the protrusion 253. When the horizontal distance S1 of the protrusion 253 is smaller than the vertical distance S2 of the protrusion 253, the ratio of light emitted through the first dielectric pattern 252a and the protrusion 253 can be increased, thereby reducing or preventing image quality distortion degradation.

[0103] The angle α of the side surface (S) of the protrusion 253 may be greater than 45 degrees and less than 90 degrees. Here, the angle α is an inner angle of the protrusion 253 formed by the top surface (b) of the first dielectric pattern 252a and the side surface (S) of the protrusion 253. Fig. 12A In the experimental example shown in the figure, when the angle α of the protrusion 253 is 90 degrees, due to the surface polarization density ρ ps becomes zero, so the influence of the charge amount can be reduced, and the driving characteristics can be deteriorated. Fig. 12B As shown, in the exemplary embodiment of the present disclosure, when the angle α of the protrusion 253 is an acute angle or less than 90 degrees, due to the surface polarization density ρ ps becomes greater than zero, so the amount of charge can be increased, thereby improving the driving characteristics.

[0104] Since the first dielectric pattern 252a according to one or more exemplary embodiments of the present disclosure may have the protrusion 253 on a portion of the top surface of the first dielectric pattern 252a, and the protrusion 253 may have an inclined side surface, when a voltage is applied to the first electrode 230 and the second electrode 240, the surface polarization density or the dielectric polarization density may change. In this case, an electric field may be generated in a direction perpendicular to the first electrode 230 and in a direction inclined relative to the first electrode 230 around the protrusion 253. When a voltage is applied to the first electrode 230 and the second electrode 240, a plurality of light-blocking particles 254b included in the second dielectric 254 move in a direction perpendicular to the first electrode 230 and in a direction inclined relative to the first electrode 230.

[0105] Therefore, if Fig. 9 and Fig.10 As shown, in the region where the groove 252c is formed, the plurality of light blocking particles 254b move into the groove 252c, and some of the plurality of light blocking particles 254b distributed on the top surface of the first dielectric pattern 252a also move into the groove 252c along the inclined direction.

[0106] Therefore, since the protrusion 253 having the inclined side surface may be provided on a portion of the top surface of the first dielectric pattern 252a, the light control panel 200 according to one or more exemplary embodiments of the present disclosure can control the direction of the electric field to be directed to the groove 252c when a voltage is applied to the first electrode 230 and the second electrode 240. Therefore, the light control panel 200 according to one embodiment of the present disclosure can significantly improve the light transmittance in the light transmission mode because the plurality of light blocking particles 254b can move into the groove 252c instead of being distributed in a region other than the groove 252c.

[0107] In addition, in the light control panel 200 according to an exemplary embodiment of the present disclosure, since a portion of the top surface of the first dielectric pattern 252a can be flat and the top surface of the protrusion 253 can be flat, when light is transmitted in a light-transmitting mode, significant refraction of light on the top surfaces of the first dielectric pattern 252a and the protrusion 253 can be reduced or prevented.

[0108] In addition, in the light control panel 200 according to the exemplary embodiment of the present disclosure, a portion of the top surface of the first dielectric pattern 252 a may be flat, and a top surface of the protrusion 253 may be flat, thereby reducing or preventing the occurrence of a double image.

[0109] The first dielectric pattern 252a may be disposed to overlap the transmission area TA of the transparent display panel 100. Figure 8 As shown. In the light control panel 200 according to the exemplary embodiment of the present disclosure, in the light transmission mode, the plurality of light-blocking particles 254b can move into the groove 252c and cannot remain in the area where the first dielectric pattern 252a is set. In the light control panel 200 according to the exemplary embodiment of the present disclosure, external light can be transmitted through the area where the plurality of light-blocking particles 254b are not set (that is, the area where the first dielectric pattern 252a is set). The light passing through the light control panel 200 is incident on the transparent display panel 100 and can pass through the transparent display panel 100 through the transmission area TA of the transparent display panel 100.

[0110] In this way, external light can pass through the transparent display device 10 through the area where the first dielectric pattern 252a of the light control panel 200 is disposed and the transmission area TA of the transparent display panel 100. In the transparent display device 10 according to the exemplary embodiment of the present disclosure, the first dielectric pattern 252a of the light control panel 200 can be disposed to overlap with the transmission area TA of the transparent display panel 100 to achieve high light transmittance in the light transmission mode.

[0111] The first dielectric pattern 252a of the light control panel 200 may be arranged not to overlap with the non-transmission area NTA of the transparent display panel 100. That is, the first dielectric pattern 252a of the light control panel 200 may be arranged not to overlap with the light emitting device E of the transparent display panel 100. In addition, the first dielectric pattern 252a of the light control panel 200 may be arranged not to overlap with the transistor T of the transparent display panel 100. In addition, the first dielectric pattern 252a of the light control panel 200 may be arranged not to overlap with the color filter CF and the light blocking layer 114 of the transparent display panel 100.

[0112] One first electrode 230 or one second electrode 240 may be arranged to overlap with a plurality of first dielectric patterns 252a. One first electrode 230 or one second electrode 240 may be arranged to overlap with a plurality of spacers 252b. One first electrode 230 or one second electrode 240 may be arranged to overlap with a plurality of grooves 252c. One first electrode 230 or one second electrode 240 may be arranged to correspond to a plurality of protrusions 253. For example, one first electrode 230 or one second electrode 240 may be arranged to overlap with a plurality of protrusions 253.

[0113] The first dielectric pattern 252a may extend in one direction. In an exemplary embodiment, the first dielectric pattern 252a may extend in a first direction (eg, a Y-axis direction). Fig.10 As shown. For example, the first dielectric pattern 252a may extend parallel to the first signal line SL1. The first dielectric pattern 252a is disposed to overlap with the transmission area TA of the transparent display panel 100 and may have a first width W1. The first width W1 may be equal to or greater than the width of the transmission area TA of the transparent display panel 100 in the first direction (e.g., the Y-axis direction). In this case, the light control panel 200 according to an exemplary embodiment of the present disclosure may include only one first dielectric pattern 252a between two adjacent spacers 252b.

[0114] exist Fig.10In the embodiment, the first dielectric pattern 252a is illustrated as extending in the first direction (eg, the Y-axis direction), but is not necessarily limited thereto. The extending direction of the first dielectric pattern 252a may vary depending on the shape of the transmissive area TA in the transparent display panel 100. Figure 3 As shown, the transparent display panel 100 may include a transmissive area TA arranged in a straight line along a first direction (eg, a Y-axis direction). In this case, the first dielectric pattern 252a may extend in the first direction (eg, the Y-axis direction), as shown in FIG. Fig.10 shown.

[0115] However, with Figure 3 Unlike the configuration shown, the transparent display panel 100 may include the transmissive areas TA arranged in a straight line along the second direction (eg, the X-axis direction). In this case, the first dielectric pattern 252a may extend in the second direction (eg, the X-axis direction).

[0116] The spacer 252b may be disposed between the first electrode 230 and the second electrode 240 to maintain a gap between the first electrode 230 and the second electrode 240. The spacer 252b may be disposed between adjacently arranged first dielectric patterns 252a on a plane. The groove 252c may be disposed at at least one side of the spacer 252b (or may be disposed on at least one side of the spacer 252b).

[0117] The spacer 252b may be spaced apart from the first dielectric pattern 252a, and the groove 252c may be interposed between the spacer 252b and the first dielectric pattern 252a. For example, the spacer 252b may be disposed between two first dielectric patterns 252a. One groove 252c may be disposed on one side of the spacer 252b facing one first dielectric pattern 252a, and the spacer 252b may be spaced apart from one first dielectric pattern 252a, and one groove 252c may be interposed between the spacer 252b and the first dielectric pattern 252a. In addition, another groove 252c may be disposed on the other side of the spacer 252b facing another first dielectric pattern 252a, and the spacer 252b may be spaced apart from another first dielectric pattern 252a, and another groove 252c may be interposed between the spacer 252b and another first dielectric pattern 252a. The spacer 252b may be disposed between two grooves 252c.

[0118] The spacer 252b may be disposed to overlap the non-transmission area NTA of the transparent display panel 100. The spacer 252b may extend in one direction in the area overlapping the non-transmission area NTA of the transparent display panel 100. In an exemplary embodiment, the spacer 252b may extend in a first direction (eg, a Y-axis direction), such as Fig.10As shown. For example, the spacer 252b may extend parallel to the first signal line SL. The spacer 252b may have a second width W2 and extend in a first direction (e.g., Y-axis direction) parallel to the first dielectric pattern 252a. The second width W2 may be smaller than the first width W1 of the first dielectric pattern 252a, and smaller than the width of the non-transmission area NTA of the transparent display panel 100 in the first direction (e.g., Y-axis direction).

[0119] exist Fig.10 In the embodiment, the spacer 252b is illustrated as extending in the first direction (eg, the Y-axis direction), but it is not necessarily limited thereto. The extending direction of the spacer 252b may vary depending on the shape of the non-transmission area NTA in the transparent display panel 100. Figure 3 As shown, the transparent display panel 100 may have non-transmission areas NTA arranged in a straight line along a first direction (eg, a Y-axis direction). Fig.10 As shown, the spacer 252b may extend in a first direction (eg, the Y-axis direction).

[0120] However, in the transparent display panel 100, Figure 3 Unlike the configuration shown, the non-transmission area NTA may be disposed in a straight line along the second direction (eg, the X-axis direction). In this case, the spacer 252b may extend in the second direction (eg, the X-axis direction).

[0121] The groove 252c may be disposed between the first dielectric pattern 252a and the spacer 252b. The groove 252c may be formed concavely toward the first electrode 230, and aggregate light-blocking particles 254b included in the second dielectric 254 in a light-transmitting mode.

[0122] The groove 252c may be disposed to overlap the non-transmission area NTA of the transparent display panel 100. Figure 8 As shown, at least a portion of the groove 252c of the light control panel 200 may be disposed to overlap with the light emitting device E of the transparent display panel 100. In addition, at least a portion of the groove 252c of the light control panel 200 may be disposed to overlap with the transistor T of the transparent display panel 100. In addition, at least a portion of the groove 252c of the light control panel 200 may be disposed to overlap with the color filter CF and the light blocking layer 114 of the transparent display panel 100.

[0123] When a voltage is applied to the first electrode 230 and the second electrode 240, the plurality of light-blocking particles 254b may move into the groove 252c along the electric field direction. In this example, the region where the groove 252c is provided may block external light transmission by the plurality of light-blocking particles 254b. Therefore, when the region where the groove 252c is provided overlaps with the transmission region TA of the transparent display panel 100, in the light-transmitting mode, due to the plurality of light-blocking particles 254b gathered in the groove 252c of the first dielectric 252 included in the light-control panel 200, the light transmittance of the transparent display device 10 can be reduced. In the light-control panel 200 according to the exemplary embodiment of the present disclosure, the groove 252c and the spacer 252b provided between the grooves 252c are provided to overlap with the non-transmission region NTA of the transparent display panel 100, so in the light-transmitting mode, the light transmittance may be reduced or prevented from being reduced due to the light-blocking particles 254b gathered in the groove 252c.

[0124] The groove 252c may extend in one direction. In an exemplary embodiment, the groove 252c may extend in a first direction (eg, the Y-axis direction). Fig.10 For example, the groove 252c may extend parallel to the first signal line SL1. The groove 252c may be disposed to extend parallel to at least one of the first dielectric pattern 252a, the spacer 252b, and the protrusion 253 in an area corresponding to the non-transmission area NTA.

[0125] The groove 252c may have a third width W3 and may extend in a first direction (e.g., Y-axis direction) parallel to the first dielectric pattern 252a. The third width W3 is smaller than the first width W1 of the first dielectric pattern 252a and smaller than the width of the non-transmission area NTA of the transparent display panel 100 in the first direction (e.g., Y-axis direction).

[0126] More specifically, the fourth width W4 of the groove 252c and the spacer 252b 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 Y-axis direction). For example, when two grooves 252c are adjacently arranged with a spacer 252b between them, the fourth width W4 is the sum of the third width W3 of each of the two grooves 252c, and the second width W2 of the spacer 252b 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 Y-axis direction). Thus, the light control panel 200 according to the exemplary embodiment of the present disclosure can reduce or prevent the groove 252c from overlapping the transmission area TA of the transparent display panel 100, and further, in the light transmission mode, the light transmittance of the transparent display device 10 can be reduced or prevented from being reduced due to the light-blocking particles 254b gathered in the groove 252c.

[0127] exist Fig.10 In the embodiment, the groove 252c is illustrated as extending in the first direction (eg, the Y-axis direction), but is not necessarily limited thereto. The extending direction of the groove 252c may vary depending on the shape of the non-transmission area NTA in the transparent display panel 100. Figure 3 As shown, the transparent display panel 100 may include non-transmission areas NTA arranged in a straight line along a first direction (eg, a Y-axis direction). Fig.10 As shown, the groove 252c may extend in a first direction (eg, the Y-axis direction).

[0128] However, in the transparent display panel 100, Figure 3 Unlike the configuration shown, the non-transmission area NTA may be disposed in a straight line along the second direction (eg, the X-axis direction). In this case, the groove 252c may extend in the second direction (eg, the X-axis direction).

[0129] In an exemplary embodiment, the first dielectric pattern 252a, the spacer 252b, the protrusion 253 and the groove 252c included in the first dielectric 252 can be formed as one body. The first dielectric pattern 252a, the spacer 252b, the protrusion 253 and the groove 252c included in the first dielectric 252 can be made of the same first dielectric material. The first dielectric pattern 252a, the spacer 252b, the protrusion 253 and the groove 252c included in the first dielectric 252 can be formed simultaneously by a stamping process. The light control panel 200 according to the exemplary embodiment of the present disclosure forms the first dielectric pattern 252a, the spacer 252b, the protrusion 253 and the groove 252c by a stamping process at the same time, thereby reducing the manufacturing process cost and the manufacturing process time due to the simple manufacturing process, and further reducing the production energy consumption. In addition, the light control panel 200 according to the exemplary embodiment of the present disclosure can reduce the manufacturing process, and can reduce the generation of greenhouse gases due to the manufacturing process, thereby improving the ESG (environment / social / governance) quality.

[0130] Each of the dielectric pattern 252a, the spacer 252b, the protrusion 253, and the groove 252c may be embossed on one surface of the first electrode 230 to have different thicknesses. The sum of the thickness of the first dielectric pattern 252a and the thickness of the protrusion 253 may be a first thickness T1, and the spacer 252b may have a second thickness T2 greater than the first thickness T1. In this example, the second thickness T2 may correspond to the separation distance between the first electrode 230 and the second electrode 240. The first dielectric pattern 252a may have a third thickness T3 less than the second thickness T2. In a region corresponding to the groove 252c between the first dielectric pattern 252a and the spacer 252b, the first dielectric pattern 252a may have a fourth thickness T4. The fourth thickness T4 may be less than the third thickness T3 of the first dielectric pattern 252a, but may be greater than 0. That is, the first dielectric 252 may be formed to have a predetermined fourth thickness T4 in a region where the groove 252c is provided without exposing the first electrode 230.

[0131] Since the light control panel 200 according to the exemplary embodiment of the present disclosure includes a first dielectric 252 having a predetermined thickness in the area where the groove 252c is formed, when a voltage is applied to the first electrode 230 and the second electrode 240, the impact applied when the light-blocking particles 254b gather in the groove 252c can be reduced, thereby reducing or preventing damage to the light-blocking particles 254b.

[0132] The second dielectric 254 may be disposed on a side of the second electrode 240 that faces the first electrode 230. Figures 7 to 9 As shown, the second dielectric 254 may include a solvent 254 a and a plurality of light blocking particles 254 b .

[0133] The solvent 254a is disposed on the first dielectric 252 and may fill a space formed by the step difference between the first dielectric pattern 252a, the spacer 252b, the protrusion 253, and the groove 252c. The solvent 254a may be made of a second dielectric material having a second dielectric constant. The second dielectric constant may be different from the first dielectric constant of the first dielectric material included in the first dielectric 252. In an exemplary embodiment, the second dielectric constant may be less than the first dielectric constant.

[0134] In addition, the greater the difference between the first dielectric constant and the second dielectric constant, the easier it is for the light-blocking particles 254b to move into the grooves 252c of the first dielectric 252 in the light-transmitting mode. Specifically, in the light-control panel 200, a voltage may be applied to the first electrode 230 and the second electrode 240 in the light-transmitting mode, and dielectric polarization may occur in the solvent 254a of the first dielectric 252 and the second dielectric 254. The greater the difference between the first dielectric constant and the second dielectric constant, the greater the difference in dielectric polarization density at the interface between the solvent 254a of the first dielectric 252 and the second dielectric 254.

[0135] Due to the protrusion 253 having an inclined side surface disposed on a portion of the top surface of the first dielectric pattern 252a, an electric field is generated in a direction inclined toward the groove 252c, and the greater the dielectric polarization density difference at the interface between the first dielectric 252 and the solvent 254a of the second dielectric 254, the greater the inclination of the electric field direction can be. Therefore, when switching from the light blocking mode to the light transmitting mode, the plurality of light blocking particles 254b can more easily move into the groove 252c of the first dielectric 252.

[0136] In one exemplary embodiment, the difference between the first dielectric constant and the second dielectric constant may be greater than 15. By ensuring that the dielectric constant difference between the solvent 254a of the first dielectric 252 and the second dielectric 254 is greater than or equal to 15, the light control panel 200 can allow the plurality of light blocking particles 254b to completely move into the groove 252c of the first dielectric 252 in the light transmission mode. The light control panel 200 can increase the light transmittance in the light transmission mode.

[0137] In one exemplary embodiment, the top surface of the first dielectric 252 may be plasma treated to have hydrophilicity. The first dielectric 252 may be in direct contact with the solvent 254a of the second dielectric 254 on its top surface. As the dielectric constant difference between the first dielectric 252 and the solvent 254a of the second dielectric 254 increases, the adhesion between the first dielectric 252 and the solvent 254a of the second dielectric 254 may decrease. The reduced adhesion between the first dielectric 252 and the second dielectric 254 may increase the possibility of the second dielectric 254 detaching from the first dielectric 252. In order to reduce or prevent this, the first dielectric 252 may be plasma treated so that the top surface of the first dielectric 252 in contact with the solvent 254a of the second dielectric 254 changes from hydrophobic to hydrophilic. Thus, the adhesion between the first dielectric 252 and the second dielectric 254 having a large dielectric constant difference can be improved, and the second dielectric 254 can be reduced or prevented from peeling off from the first dielectric 252.

[0138] The plurality of light-blocking particles 254b may be negatively or positively charged and distributed in the solvent 254a, and may block light incident from the outside. The plurality of light-blocking particles 254b may be an electrophoretic material, such as carbon particles.

[0139] The area where the plurality of light-blocking particles 254b are distributed may vary depending on whether a voltage is applied to the first electrode 230 and the second electrode 240. When no voltage is applied to the first electrode 230 and the second electrode 240, the plurality of light-blocking particles 254b may be as shown in FIG. Figure 7 As shown, the plurality of light-blocking particles 254b are uniformly dispersed in the solvent 254a. Since the plurality of light-blocking particles 254b are distributed over the entire region where the solvent 254a is provided, the light-blocking mode can be achieved by blocking external light over the entire region by the plurality of light-blocking particles 254b. External light cannot pass through the light-control panel 200, and cannot enter the transmission area TA and the non-transmission area NTA of the transparent display panel 100.

[0140] On the other hand, when a voltage is applied to the first electrode 230 and the second electrode 240, as shown in FIG. Fig. 9 As shown, a plurality of light-blocking particles 254b may be gathered in the groove 252c of the first dielectric 252 along the direction of the electric field. A plurality of light-blocking particles 254b may be distributed only in the region where the groove 252c is formed, and may not be distributed in the region where the groove 252c is not formed. External light may be transmitted in the region other than the groove 252c, thereby realizing a light-transmitting mode. Light passing through the light control panel 200 may pass through the transparent display panel 100 through the transmission area TA of the transparent display panel 100. Thus, a user located on the front surface of the transparent display device 10 can see an object located on the rear surface of the transparent display device 10.

[0141] The adhesive layer 260 is 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 260 may be a transparent adhesive film such as an optically clear adhesive OCA, or a transparent adhesive such as an optically clear resin OCR.

[0142] The light control panel 200 according to the exemplary embodiment of the present disclosure can use the electrophoretic element to realize the light blocking mode and the light transmission mode. Thus, the light control panel 200 according to the exemplary embodiment of the present disclosure can realize the transparent display device 10 that allows the user to see the object located on the rear surface of the transparent display device 10 in the light transmission mode. At the same time, the light control panel 200 according to the exemplary embodiment of the present disclosure can enable the transparent display device 10 to display an image with high contrast in the light blocking mode.

[0143] In addition, the light control panel 200 according to the exemplary embodiment of the present disclosure may include each of the first electrode 230 and the second electrode 240 as an integral electrode, thereby reducing electrode processing costs and simplifying the driving circuit. In addition, in the light control panel 200 according to the exemplary embodiment of the present disclosure, the edge of the electrode is not set in the display area DA of the transparent display panel 100, and therefore, the plurality of light-blocking particles 254b can be reduced or prevented from agglomerating in the area overlapping the display area DA of the transparent display panel 100.

[0144] In addition, in the light control panel 200 according to the exemplary embodiment of the present disclosure, the top surface of the first dielectric 252 may be formed to have a protrusion 253 protruding toward the second electrode 240 between the two grooves 252c. Thus, in the light control panel 200 according to the exemplary embodiment of the present disclosure, when a voltage is applied to the first electrode 230 and the second electrode 240, the plurality of light blocking particles 254b may move into the groove 252c and may not remain on the top surface of the first dielectric pattern 252a. The light control panel 200 according to the exemplary embodiment of the present disclosure can increase light transmittance in the light transmission mode.

[0145] In addition, in the light control panel 200 according to the exemplary embodiment of the present disclosure, the first dielectric pattern 252a of the first dielectric 252 may be disposed to overlap the transmission area TA of the transparent display panel 100, thereby achieving high light transmittance in the light transmission mode.

[0146] In addition, in the light control panel 200 according to the exemplary embodiment of the present disclosure, the groove 252c of the first dielectric 252 can be set to overlap with the non-transmitting area NTA of the transparent display panel 100, so that the transmittance in the light transmission mode can be reduced or prevented from being reduced due to the light-blocking particles 254b gathered in the groove 252c of the first dielectric 252.

[0147] In addition, in the light control panel 200 according to the exemplary embodiment of the present disclosure, the first dielectric 252 can be formed to have a predetermined thickness in the area where the groove 252c is formed, so that the impact applied when the light-blocking particles 254b gather in the groove 252c can be mitigated, thereby reducing or preventing damage to the light-blocking particles 254b.

[0148] In addition, in the light control panel 200 according to the exemplary embodiment of the present disclosure, the first dielectric pattern 252a, the spacer 252b, the protrusion 253 and the groove 252c can be formed simultaneously by a stamping process. Thus, the light control panel 200 according to the exemplary embodiment of the present disclosure can reduce the manufacturing process cost and manufacturing process time due to the simple manufacturing process, and further reduce the production energy consumption. In addition, the light control panel 200 according to the exemplary embodiment of the present disclosure can reduce the manufacturing process, and can reduce the generation of greenhouse gases due to the manufacturing process, thereby improving the ESG (environment / social / governance) quality.

[0149] Furthermore, in the light control panel 200 according to the exemplary embodiment of the present disclosure, the dielectric constant difference between the first dielectric 252 and the second dielectric 254 may be large, so that the plurality of light blocking particles 254 b can completely move into the grooves 252 c of the first dielectric 252 .

[0150] like Figures 6 to 10 As shown, the light control panel 200 according to the exemplary embodiment of the present disclosure may have a first dielectric pattern 252a of the first dielectric 252 aligned with the transmission area TA of the transparent display panel 100, and a groove 252c of the first dielectric 252 aligned with the non-transmission area NTA of the transparent display panel 100. However, it is not necessarily limited thereto.

[0151] The light control panel 200 may be implemented as a film type having flexibility.

[0152] In the following, reference will be made to Figures 13 to 16 A light control panel 200 according to another exemplary embodiment of the present disclosure is described in detail. Figures 6 to 12B Compared with the light control panel 200 according to the exemplary embodiment of the present disclosure shown in FIG. 1 , the light control panel 200 according to another exemplary embodiment of the present disclosure is different only in the dielectric layer 250, and the other components are substantially the same. Hereinafter, the differences will be mainly described, and the description of substantially the same components will be omitted for the sake of brevity. The exemplary embodiments described below may be combined or applied to Figure 6 to Figure 1 2 shows the structure of an exemplary embodiment of the present disclosure.

[0153] Reference Fig.13 , a light control panel 200 according to another exemplary embodiment of the present disclosure includes a first substrate 210 , a second substrate 220 , a first electrode 230 , a second electrode 240 , a dielectric layer 250 , and an adhesive layer 260 .

[0154] The dielectric layer 250 is disposed between the first electrode 230 and the second electrode 240 to implement a light-blocking mode or a light-transmitting mode depending on whether a voltage is applied to the first electrode 230 and the second electrode 240. For example, when a voltage is applied to the first electrode 230 and the second electrode 240, the dielectric layer 250 may implement a light-transmitting mode. On the other hand, when no voltage is applied to the first electrode 230 and the second electrode 240, the dielectric layer 250 may implement a light-blocking mode.

[0155] The light control panel 200 may include a plurality of first dielectric patterns 252a between two adjacent spacers 252b. A plurality of protrusions 253 may be provided between two adjacent spacers 252b.

[0156] One first dielectric pattern 252a may be disposed to correspond to one transmission area TA, and the second groove 252d may be disposed to correspond to one non-transmission area NTA.

[0157] The spacer 252b may be disposed to correspond to the non-transmission area NTA. A plurality of transmission areas TA and non-transmission areas NTA may be disposed to correspond to each other in an area between adjacent spacers 252b.

[0158] The first dielectric pattern 252a may guide a plurality of light-blocking particles 254b included in the second dielectric 254 to the first groove 252c or the second groove 252d. Specifically, the first dielectric pattern 252a may include a protrusion 253 on which a portion of the top surface of the first dielectric pattern 252a protrudes toward the second electrode 240. In this example, the top surface of the first dielectric pattern 252a without the protrusion 253 may be flat. In this case, when a voltage is applied to the first electrode 230 and the second electrode 240, dielectric polarization occurs in the first dielectric material of the first dielectric pattern 252a, and the dielectric polarization density varies depending on the protrusion 253 provided on the top surface. Therefore, due to the protrusion 253 having an inclined side surface provided on the top surface of the first dielectric pattern 252a, an electric field may be generated in a direction inclined toward the first groove 252c or the second groove 252d. The protrusion 253 may be provided at the center of the top surface of the first dielectric pattern 252a.

[0159] Thus, in the light control panel 200 according to another exemplary embodiment of the present disclosure, when a voltage is applied to the first electrode 230 and the second electrode 240, the plurality of light blocking particles 254b can move to the groove 252c disposed between the first dielectric patterns 252a, and the plurality of light blocking particles 254b cannot be disposed on the top surface of the first dielectric pattern 252a. Therefore, in the light control panel 200 according to another exemplary embodiment of the present disclosure, the light transmittance can be improved in the light transmission mode.

[0160] Reference Fig.14 , a light control panel 200 according to another exemplary embodiment of the present disclosure includes a first substrate 210, a second substrate 220, a first electrode 230, a second electrode 240, a dielectric layer 250, and an adhesive layer 260. Hereinafter, detailed descriptions of substantially the same components will be omitted, and differences from other exemplary embodiments will be mainly described.

[0161] The dielectric layer 250 may include a first dielectric 252 and a second dielectric 254. The first dielectric 252 and the second dielectric 254 may be made of different dielectric materials. The light control panel 200 according to another exemplary embodiment of the present disclosure can control the direction of the electric field in a desired direction by utilizing the shape of the interface between the first dielectric 252 and the second dielectric 254 and the dielectric permittivity difference between the first dielectric 252 and the second dielectric 254. In addition, the light control panel 200 according to another exemplary embodiment of the present disclosure may have a structure that does not require alignment between a component of the first dielectric 252 and the transmissive area TA of the transparent display panel 100.

[0162] Specifically, the first dielectric 252 is disposed on a side of the first electrode 230 facing the second electrode 240 and may be made of a first dielectric material having a first dielectric constant. Fig.14 and Fig.15 As shown, the first dielectric 252 may include a first dielectric pattern 252 a , a protrusion 253 , a spacer 252 b , a first groove 252 c , and a second groove 252 d .

[0163] The first dielectric pattern 252a may guide the plurality of light-blocking particles 254b contained in the second dielectric 254 to the first groove 252c or the second groove 252d. Specifically, the first dielectric pattern 252a may include a protrusion 253 in which a portion of the top surface of the first dielectric pattern 252a protrudes toward the second electrode 240. In this example, the top surface of the first dielectric pattern 252a without the protrusion 253 may be flat. In this case, when a voltage is applied to the first electrode 230 and the second electrode 240, dielectric polarization occurs in the first dielectric material of the first dielectric pattern 252a, and the dielectric polarization density varies depending on the protrusion 253 provided on the top surface. Therefore, due to the protrusion 253 having an inclined side surface provided on the top surface of the first dielectric pattern 252a, an electric field may be generated in a direction inclined toward the first groove 252c or the second groove 252d. The protrusion 253 may be provided at the center of the top surface of the first dielectric pattern 252a.

[0164] The plurality of light-blocking particles 254b included in the second dielectric 254 can be moved by 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 plurality of light-blocking particles 254b can move to the first groove 252c or the second groove 252d along the direction of the electric field. Therefore, the plurality of light-blocking particles 254b will not be arranged on the area where the first dielectric pattern 252a is arranged, and the area where the first dielectric pattern 252a is arranged can have a high light transmittance. Therefore, external light can be transmitted through the area where the first dielectric pattern 252a is arranged. The light passing through the light control panel 200 can be incident on the transparent display panel 100.

[0165] In this way, in the light control panel 200 according to another exemplary embodiment of the present disclosure, since the protrusion 253 having an inclined side surface may be provided on the top surface of the first dielectric pattern 252a, when a voltage is applied to the first electrode 230 and the second electrode 240, the direction of the electric field may be controlled to face the first groove 252c or the second groove 252d. Therefore, in the light control panel 200 according to another exemplary embodiment of the present disclosure, the plurality of light-blocking particles 254b can be accurately moved to the first groove 252c or the second groove 252d, and high light transmittance can be achieved in the light transmission mode.

[0166] In addition, in the light control panel 200 according to another exemplary embodiment of the present disclosure, the protrusion 253 disposed on the top surface of the first dielectric pattern 252 a has an inclined side surface and a flat top surface, thereby reducing or preventing the occurrence of a double image.

[0167] At least a portion of the first dielectric pattern 252a may be disposed to overlap with the transmission area TA of the transparent display panel 100. In the light control panel 200 according to another exemplary embodiment of the present disclosure, in the light transmission mode, the plurality of light-blocking particles 254b may be moved into the first groove 252c or the second groove 252d, and may not be disposed in the area where the first dielectric pattern 252a is disposed. In the light control panel 200 according to another exemplary embodiment of the present disclosure, external light may be transmitted through an area where the plurality of light-blocking particles 254b are not disposed (i.e., an area where the first dielectric pattern 252a is disposed). Since at least a portion of the first dielectric pattern 252a of the light control panel 200 may be disposed to overlap with the transmission area TA of the transparent display panel 100, light passing through the light control panel 200 may pass through the transparent display panel 100 through the transmission area TA of the transparent display panel 100.

[0168] In this way, external light can pass through the transparent display device 10 through the area where the first dielectric pattern 252a of the light control panel 200 is disposed and the transmission area TA of the transparent display panel 100. In the transparent display device 10 according to another exemplary embodiment of the present disclosure, at least a portion of the first dielectric pattern 252a of the light control panel 200 can be disposed to overlap with the transmission area TA of the transparent display panel 100, thereby achieving high light transmittance in the light transmission mode.

[0169] like Figures 14 to 16 As shown, in the light control panel 200 according to another exemplary embodiment of the present disclosure, one transmission area TA of the transparent display panel 100 may overlap with the plurality of first dielectric patterns 252a. That is, in the light control panel 200 according to another exemplary embodiment of the present disclosure, the plurality of first dielectric patterns 252a may be disposed in an area overlapping with one transmission area TA. Therefore, the plurality of protrusions 253 may be disposed in an area overlapping with one transmission area TA.

[0170] In addition, in the light control panel 200 according to another exemplary embodiment of the present disclosure, a plurality of first dielectric patterns 252a may be disposed between two adjacent spacers 252b. A region between two adjacent spacers 252b may correspond to one transmission area TA.

[0171] For example, Figures 14 to 16 As shown, two first dielectric patterns 252a may be disposed between two adjacent spacers 252b, but the present invention is not necessarily limited thereto. Three or more first dielectric patterns 252a may be disposed between two adjacent spacers 252b.

[0172] The protrusion 253 and each first dielectric pattern 252a may extend in one direction. In an exemplary embodiment, the first dielectric pattern 252a and the protrusion 253 may extend parallel to each other in a first direction (eg, a Y-axis direction). Fig.16 For example, each of the protrusion 253 and the first dielectric pattern 252 a may extend parallel to the first signal line SL1 . At least a portion of each of the protrusion 253 and the first dielectric pattern 252 a is disposed to overlap the transmission area TA of the transparent display panel 100 .

[0173] In the light control panel 200 according to another exemplary embodiment of the present disclosure, the distance between the center of one first dielectric pattern 252a and the center of another adjacent first dielectric pattern 252a may be a second distance d2. The second distance d2 may be less than the width of the transmission area TA. In the light control panel 200 according to another exemplary embodiment of the present disclosure, when switching from the light blocking mode to the light transmission mode, the moving distance of the light blocking particles 254b is reduced, so that the light blocking particles 254b can be better gathered in the grooves 252c and 252d.

[0174] The spacer 252b may be disposed between the first electrode 230 and the second electrode 240 to maintain a gap between the first electrode 230 and the second electrode 240. The spacer 252b may be disposed between the first dielectric patterns 252a disposed adjacently on a plane.

[0175] The first groove 252c may be provided at or on at least one side of the spacer 252b. The first groove 252c may be provided on one side of the spacer 252b facing the first dielectric pattern 252a. In this example, the spacer 252b may be spaced apart from the first dielectric pattern 252a, and the first groove 252c is interposed between the spacer 252b and the first dielectric pattern 252a. For example, the spacer 252b may be provided between two first dielectric patterns 252a. One first groove 252c may be provided on one side of the spacer 252b facing one first dielectric pattern 252a, and the spacer 252b may be spaced apart from one first dielectric pattern 252a, and one first groove 252c is interposed between the spacer 252b and the first dielectric pattern 252a. In addition, another first groove 252c may be provided on the other side of the spacer 252b facing the another first dielectric pattern 252a, and the spacer 252b may be spaced apart from the another first dielectric pattern 252a, and the another first groove 252c is interposed between the spacer 252b and the another first dielectric pattern 252a. The spacer 252b may be provided between the two first grooves 252c.

[0176] At least a portion of the spacer 252b may be disposed to overlap the non-transmission area NTA of the transparent display panel 100. The spacer 252b may extend in one direction. In an exemplary embodiment, the spacer 252b may extend in a first direction (eg, a Y-axis direction), such as Fig.16 For example, the spacer 252b may extend parallel to the first signal line SL.

[0177] The first groove 252c may be disposed between the first dielectric pattern 252a and the spacer 252b, and the second groove 252d may be disposed between adjacent first dielectric patterns 252a. At least a portion of each of the first groove 252c and the second groove 252d may overlap with the transmission area TA of the transparent display panel 100, and the remaining portion may overlap with the non-transmission area NTA of the transparent display panel 100.

[0178] The first groove 252c and the second groove 252d are formed concavely toward the first electrode 230, and can aggregate the light-blocking particles 254b contained in the second dielectric 254 in the light-transmitting mode. When a voltage is applied to the first electrode 230 and the second electrode 240, the plurality of light-blocking particles 254b can move to the first groove 252c or the second groove 252d along the direction of the electric field.

[0179] Each of the first groove 252c and the second groove 252d may extend in one direction. In an exemplary embodiment, each of the first groove 252c and the second groove 252d may extend in a first direction (eg, a Y-axis direction). Fig.16 For example, each of the first groove 252c and the second groove 252d may extend parallel to the first signal line SL1.

[0180] The first groove 252c and the second groove 252d may have different widths. For example, the second groove 252d disposed between the first dielectric patterns 252a may be formed to have a smaller width than the first groove 252c because the second groove 252d overlaps a larger area with the transmissive area TA of the transparent display panel 100 than the first groove 252c. As a result, the light control panel 200 according to another exemplary embodiment of the present disclosure can minimize the reduction in the light transmittance of the transparent display device 10 due to the light-blocking particles 254b gathered in the second groove 252d in the light transmission mode.

[0181] In an exemplary embodiment, the first dielectric pattern 252a, the spacer 252b, the protrusion 253, the first groove 252c and the second groove 252d included in the first dielectric 252 may be formed as one body. The first dielectric pattern 252a, the spacer 252b, the protrusion 253, the first groove 252c and the second groove 252d included in the first dielectric 252 may be made of the same first dielectric material. The first dielectric pattern 252a, the spacer 252b, the protrusion 253, the first groove 252c and the second groove 252d included in the first dielectric 252 may be formed simultaneously by an embossing process. The light control panel 200 according to another exemplary embodiment of the present disclosure simultaneously forms the first dielectric pattern 252a, the spacer 252b, the protrusion 253, the first groove 252c and the second groove 252d by an embossing process, thereby reducing the manufacturing process cost and the manufacturing process time due to the simplicity of the manufacturing process, and further reducing the production energy consumption. Furthermore, the light control panel 200 according to another exemplary embodiment of the present disclosure can reduce manufacturing processes and can reduce greenhouse gas generation due to the manufacturing process, thereby improving ESG (Environment / Society / Governance) quality.

[0182] Each of the first dielectric pattern 252a, the spacer 252b, the protrusion 253, the first groove 252c, and the second groove 252d may be embossed on one surface of the first electrode 230 to have different thicknesses. In the light control panel 200 according to another exemplary embodiment of the present disclosure, the thickness of the first dielectric pattern 252a, the protrusion 253, the spacer 252b, the first groove 252c, and the second groove 252d may be equal to the reference 2 Figure 7 The thickness in the exemplary embodiment of the present disclosure is described.

[0183] The thickness of the first dielectric 252 in the region where the first groove 252c is provided may be equal to the thickness of the first dielectric 252 in the region where the second groove 252d is provided. Here, the thickness of the first dielectric 252 in the region where the first groove 252c is provided may be the distance from the bottom surface of the first groove 252c to the top surface of the first electrode 230. The thickness of the first dielectric 252 in the region where the second groove 252d is provided may be the distance from the bottom surface of the second groove 252d to the top surface of the first electrode 230.

[0184] Since the light control panel 200 according to another exemplary embodiment of the present disclosure includes a first dielectric 252 having a predetermined thickness in the area where the first groove 252c and the second groove 252d are formed, when a voltage is applied to the first electrode 230 and the second electrode 240, the impact applied when the light-blocking particles 254b gather in the grooves 252c and 252d can be reduced, thereby reducing or preventing damage to the light-blocking particles 254b.

[0185] The second dielectric 254 may be disposed on a side of the second electrode 240 facing the first electrode 230. Fig.14 As shown, the second dielectric 254 may include a solvent 254 a and a plurality of light blocking particles 254 b .

[0186] The solvent 254a is disposed in the first dielectric 252 and may fill a space formed by the step difference between the first dielectric pattern 252a, the protrusion 253, the spacer 252b, the first groove 252c and the second groove 252d. The solvent 254a may be made of a second dielectric material having a second dielectric constant. The second dielectric constant may be different from the first dielectric constant of the first dielectric material included in the first dielectric 252. In an exemplary embodiment, the second dielectric constant may be less than the first dielectric constant.

[0187] In addition, the greater the difference between the first dielectric constant and the second dielectric constant, the easier it is for the light-blocking particles 254b to move into the grooves 252c and 252d of the first dielectric 252 in the light-transmitting mode. In an exemplary embodiment, the difference between the first dielectric constant and the second dielectric constant may be 15 or more. By ensuring that the dielectric constant difference between the solvents 254a of the first dielectric 252 and the second dielectric 254 is greater than or equal to 15, the light-control panel 200 can allow the plurality of light-blocking particles 254b to completely move into the grooves 252c and 252d of the first dielectric 252 in the light-transmitting mode. The light-control panel 200 can improve the light transmittance in the light-transmitting mode.

[0188] In one exemplary embodiment, the top surface of the first dielectric 252 may be plasma treated to have hydrophilicity. The first dielectric 252 may be plasma treated so that the top surface of the first dielectric 252 in contact with the solvent 254a of the second dielectric 254 changes from hydrophobic to hydrophilic. Thus, the adhesion between the first dielectric 252 and the second dielectric 254 having a large dielectric constant difference can be improved, and the second dielectric 254 can be reduced or prevented from peeling off from the first dielectric 252.

[0189] The plurality of light-blocking particles 254b may be negatively or positively charged and distributed in the solvent 254a, and may block light incident from the outside. The plurality of light-blocking particles 254b may be an electrophoretic material, such as carbon particles.

[0190] The area where the plurality of light-blocking particles 254b are distributed may vary depending on whether a voltage is applied to the first electrode 230 and the second electrode 240. When no voltage is applied to the first electrode 230 and the second electrode 240, the plurality of light-blocking particles 254b may be as shown in FIG. Fig.14 As shown, the plurality of light-blocking particles 254b are uniformly dispersed in the solvent 254a. Since the plurality of light-blocking particles 254b are distributed over the entire region where the solvent 254a is provided, the light-blocking mode can be achieved by blocking the external light over the entire region by the plurality of light-blocking particles 254b. The external light cannot penetrate the light-control panel 200, and cannot enter the transmission area TA and the non-transmission area NTA of the transparent display panel 100.

[0191] On the other hand, when a voltage is applied to the first electrode 230 and the second electrode 240, as shown in FIG. Fig.15 and Fig.16 As shown, a plurality of light-blocking particles 254b may be gathered in the grooves 252c and 252d of the first dielectric 252 along the direction of the electric field. A plurality of light-blocking particles 254b may be distributed only in the region where the grooves 252c and 252d are formed, and may not be distributed in the region where the grooves 252c and 252d are not formed. In the region other than the grooves 252c and 252d, external light may be transmitted, thereby realizing a light-transmitting mode. Light passing through the light control panel 200 may pass through the transparent display panel 100 through the transmission area TA of the transparent display panel 100. Thus, a user located on the front surface of the transparent display device 10 can see an object located on the rear surface of the transparent display device 10.

[0192] According to another exemplary embodiment of the present disclosure, the light control panel 200 can use an electrophoretic element to realize a light blocking mode and a light transmission mode. Thus, according to another exemplary embodiment of the present disclosure, the light control panel 200 can realize a transparent display device 10 that allows a user to see an object located on the rear surface of the transparent display device 10 in the light transmission mode. At the same time, according to another exemplary embodiment of the present disclosure, the light control panel 200 can enable the transparent display device 10 to display an image with a high contrast in the light blocking mode.

[0193] In addition, the light control panel 200 according to another exemplary embodiment of the present disclosure may include each of the first electrode 230 and the second electrode 240 as an integral electrode, thereby reducing electrode processing costs and simplifying the driving circuit. In addition, in the light control panel 200 according to another exemplary embodiment of the present disclosure, the edge of the electrode is not disposed in the display area DA of the transparent display panel 100, and therefore, the plurality of light-blocking particles 254b can be prevented from agglomerating in the area overlapping the display area DA of the transparent display panel 100.

[0194] In addition, in the light control panel 200 according to another exemplary embodiment of the present disclosure, the protrusion 253 may be disposed on the top surface of the first dielectric pattern 252a of the first dielectric 252, the protrusion 253 may protrude toward the second electrode 240 between the two grooves 252c and 252d, and the protrusion 253 may have an inclined side surface and a flat top surface. Thus, in the light control panel 200 according to another exemplary embodiment of the present disclosure, when a voltage is applied to the first electrode 230 and the second electrode 240, the plurality of light-blocking particles 254b can quickly move into the grooves 252c and 252d and will not remain on the top surface of the first dielectric pattern 252a. The light control panel 200 according to another exemplary embodiment of the present disclosure can increase the light transmittance in the light transmission mode.

[0195] Furthermore, in the light control panel 200 according to another exemplary embodiment of the present disclosure, at least a portion of the first dielectric pattern 252a of the first dielectric 252 may be disposed to overlap the transmission area TA of the transparent display panel 100 , thereby achieving high transmittance in the light transmission mode.

[0196] In addition, in the light control panel 200 according to another exemplary embodiment of the present disclosure, at least a portion of each groove 252c and 252d of the first dielectric 252 can be set to overlap with the non-transmitting area NTA of the transparent display panel 100, so that the transmittance in the light-transmitting mode can be reduced or prevented from being reduced due to the light-blocking particles 254b accumulated in the grooves 252c and 252d of the first dielectric 252.

[0197] In addition, in the light control panel 200 according to another exemplary embodiment of the present disclosure, the width of the first dielectric pattern 252a may be reduced, and the second groove 252d may be provided between the first dielectric patterns 252a. The second groove 252d may be provided to correspond to the transmission area TA.

[0198] Since the light control panel 200 according to another exemplary embodiment of the present disclosure includes the second groove 252d, the amount of the light-blocking particles 254b gathered in the first groove 252c disposed between the first dielectric pattern 252a and the spacer 252b can be reduced, so that the width of the first groove 252c can be reduced. Therefore, the light control panel 200 according to another exemplary embodiment of the present disclosure can more easily align the first groove 252c within the non-transmission area NTA of the transparent display panel 100. That is, even if a slight process error occurs, the light control panel 200 according to another exemplary embodiment of the present disclosure can align the first groove 252c within the non-transmission area NTA of the transparent display panel 100.

[0199] In the light control panel 200 according to another exemplary embodiment of the present disclosure, due to process errors, the first groove 252c cannot be completely aligned in the non-transmission area NTA of the transparent display panel 100. However, even in this case, in the light control panel 200 according to another exemplary embodiment of the present disclosure, the light blocking particles 254b are dispersed in the second groove 252d, thereby reducing or preventing the transmittance from being greatly reduced in only certain areas in the light transmission mode, and achieving uniform transmittance.

[0200] In addition, in the light control panel 200 according to another exemplary embodiment of the present disclosure, the dielectric constant difference between the first dielectric 252 and the second dielectric 254 can be large, so that the plurality of light-blocking particles 254b can be completely moved into the grooves 252c and 252d of the first dielectric 252, thereby improving the transmittance in the light transmission mode.

[0201] In one or more exemplary embodiments of the present disclosure, a light blocking mode and a light transmission mode can be selectively implemented. Therefore, the transparent display device according to one or more exemplary embodiments of the present disclosure can allow the user to clearly see the object and the background scene on the rear surface of the transparent display device in the light transmission mode, and can also block external light from penetrating into the transparent display device in the light blocking mode to display an image with high contrast to the user.

[0202] Furthermore, in the present disclosure, each electrode is provided in the light control panel as an integral electrode, thereby reducing the cost of processing the electrode and simplifying the driving circuit.

[0203] Furthermore, in one or more exemplary embodiments of the present disclosure, since the edge of the electrode is not disposed in the display area of ​​the transparent display panel, agglomeration of a plurality of light-blocking particles in an area overlapping the display area of ​​the transparent display panel may be reduced or prevented.

[0204] In addition, in one or more exemplary embodiments of the present disclosure, since the upper surface of the first dielectric pattern of the first dielectric has a protrusion, in the light transmission mode, the plurality of light-blocking particles move into the groove and do not remain on the upper surface of the first dielectric pattern, thereby improving the transmittance in the light transmission mode.

[0205] Furthermore, in one or more exemplary embodiments of the present disclosure, the first dielectric pattern of the first dielectric may be disposed to overlap with the transmission region of the transparent display panel, thereby obtaining high light transmittance when the transparent display device operates in the light transmission mode.

[0206] In addition, in one or more exemplary embodiments of the present disclosure, the groove of the first dielectric can be configured to overlap with the non-transmissive area of ​​the transparent display panel, thereby reducing or preventing the transmittance of the transparent display device from being reduced due to light-blocking particles accumulated in the groove of the first dielectric when the transparent display device is operated in a light-transmitting mode.

[0207] Furthermore, in one or more exemplary embodiments of the present disclosure, since the first dielectric may be formed to have a predetermined thickness in the region where the groove is formed, impact applied when light-blocking particles gather in the groove can be mitigated, thereby reducing or preventing damage to the light-blocking particles.

[0208] Furthermore, in one or more exemplary embodiments of the present disclosure, the dielectric constant difference between the first dielectric and the second dielectric may be large, and the plurality of light-blocking particles can perfectly move into the grooves of the first dielectric.

[0209] Furthermore, in one or more exemplary embodiments of the present disclosure, the first dielectric pattern, the spacer, and the groove can be simultaneously formed through an imprinting process, thereby reducing manufacturing process cost and manufacturing process time due to a simple manufacturing process and further reducing production energy consumption.

[0210] Furthermore, in the present disclosure, the manufacturing process for producing the transparent display device can be reduced, and the generation of greenhouse gas due to the manufacturing process can be reduced, thereby improving ESG (environment / social / governance) quality.

[0211] In one or more exemplary embodiments of the present disclosure, a transparent display device may include: a transparent display panel, the transparent display panel including a transmission area that transmits external light and a non-transmission area in which a plurality of pixels are arranged; and a light control panel, the light control panel including a dielectric layer, wherein the dielectric layer includes a plurality of light-blocking particles that can move; the light control panel is configured to operate in a light-blocking mode or a light-transmitting mode; and for the light-transmitting mode, the light control panel is configured to move the plurality of light-blocking particles to an area corresponding to the non-transmitting area.

[0212] In addition, in one or more exemplary embodiments of the present disclosure, for the light-transmitting mode, the light-control panel is configured so that all of the multiple light-blocking particles are moved to the area corresponding to the non-transmitting area, and none of the multiple light-blocking particles exist in the area corresponding to the transmission area; and for the light-blocking mode, the light-control panel is configured so that the multiple light-blocking particles exist in the area corresponding to the non-transmitting area and the transmission area.

[0213] In addition, in one or more example embodiments of the present disclosure, the light control panel also includes a first electrode and a second electrode; the dielectric layer is arranged between the first electrode and the second electrode; and depending on whether a voltage is applied to the first electrode and the second electrode, the light control panel is configured to operate in the light blocking mode or the light transmitting mode.

[0214] The above-mentioned features, structures and effects of the present disclosure are included in at least one exemplary embodiment of the present disclosure, but are not limited to one exemplary embodiment. In addition, the features, structures and effects described in at least one exemplary embodiment of the present disclosure can be achieved by combining or modifying other exemplary embodiments by those skilled in the art. Therefore, the contents related to the combination and modification should be interpreted as being within the scope of the present disclosure.

[0215] Those skilled in the art will appreciate that various modifications and variations may be made in one or more exemplary embodiments of the present disclosure without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to cover modifications and variations of the present disclosure.

[0216] The various embodiments described above can be combined to provide further embodiments. These and other modifications can be made to the embodiments in light of the above detailed description.

[0217] CROSS-REFERENCE TO RELATED APPLICATIONS

[0218] This application claims priority to Korean Patent Application No. 10-2023-0112015 filed in Korea on August 25, 2023, the entire contents of which are expressly incorporated by reference into this application.

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 disposed between the first electrode and the second electrode, Wherein, the dielectric layer comprises: a first dielectric including a first dielectric material and a recess, the first dielectric material having a first dielectric constant; and a second dielectric, the second dielectric comprising a plurality of light-blocking particles and a solvent, the solvent comprising a second dielectric material, a second dielectric constant of the second dielectric material being smaller than the first dielectric constant, and wherein the first dielectric includes a first dielectric pattern disposed between adjacent grooves, and The first dielectric further includes a protrusion in which a portion of a top surface of the first dielectric pattern protrudes toward the second electrode.

2. The light control panel according to claim 1, wherein: The protrusion has an inclined side surface in a regular conical shape.

3. The light control panel according to claim 1, wherein: The protrusion has a flat top surface.

4. The light control panel according to claim 1, wherein: a horizontal distance between a first point of the top surface of the first dielectric pattern and a second point of the top surface of the protrusion is smaller than a vertical distance which is a height of the protrusion, wherein the first point is a point where a top surface of the first dielectric pattern intersects one end of a side surface of the protrusion, and The second point is a point where the top surface of the protrusion and the other end of the side surface of the protrusion intersect.

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

6. The light control panel according to claim 1, wherein: A difference between the first dielectric constant and the second dielectric constant is equal to or greater than 15.

7. The light control panel according to claim 1, wherein: The first dielectric further includes a spacer that maintains a gap between the first electrode and the second electrode, and Wherein, the groove is arranged on at least one side of the spacer.

8. The light control panel according to claim 7, wherein: The groove is disposed between the first dielectric pattern and the spacer, and The groove is disposed between adjacent first dielectric patterns.

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

10. The light control panel according to claim 1, wherein: The first dielectric pattern extends in a first direction, wherein the protrusion extends along the first direction on the top surface of the first dielectric pattern, and The groove extends in the first direction in parallel with the first dielectric pattern or the protrusion.

11. The light control panel according to claim 1, wherein: The first dielectric is disposed on a top surface of the first electrode, and The first dielectric has a first thickness in a region where the groove is provided.

12. The light control panel according to claim 1, wherein: The first electrode and the second electrode are each a transparent electrode, and Wherein, the first electrode or the second electrode is arranged to correspond to a plurality of protrusions.

13. A transparent display device, comprising: a transparent display panel including a transmission area for transmitting external light and a non-transmission area in which a plurality of pixels are arranged; as well as A light control panel, comprising a first electrode, a second electrode and a dielectric layer disposed between the first electrode and the second electrode, Wherein, the dielectric layer comprises: a first dielectric including a first dielectric material having a first dielectric constant, and the first dielectric further including a recess; and a second dielectric, the second dielectric comprising a plurality of light-blocking particles and a solvent, the solvent comprising a second dielectric material, a second dielectric constant of the second dielectric material being smaller than the first dielectric constant, and wherein the first dielectric includes a first dielectric pattern disposed between adjacent grooves, and The first dielectric further includes a protrusion in which a portion of a top surface of the first dielectric pattern protrudes toward the second electrode.

14. The transparent display device according to claim 13, wherein: The protrusion has an inclined side surface in a regular conical shape.

15. The transparent display device according to claim 13, wherein: The protrusion has a flat top surface.

16. The transparent display device according to claim 13, wherein: a horizontal distance between a first point of the top surface of the first dielectric pattern and a second point of the top surface of the protrusion is smaller than a vertical distance which is a height of the protrusion, wherein the first point is a point where a top surface of the first dielectric pattern intersects one end of a side surface of the protrusion, and The second point is a point where the top surface of the protrusion and the other end of the side surface of the protrusion intersect.

17. The transparent display device according to claim 13, wherein: The first dielectric pattern, the protrusion, and the groove are integrally provided.

18. The transparent display device according to claim 13, wherein: The first dielectric pattern and the protrusion are disposed in a region corresponding to the transmission region.

19. The transparent display device according to claim 13, wherein: The first dielectric pattern and the protrusion extend in a first direction in a region corresponding to the transmission region, and The groove extends along the first direction in parallel with at least one of the first dielectric pattern or the protrusion in a region corresponding to the non-transmission region.

20. The transparent display device according to claim 13, wherein: A plurality of protrusions are provided in an area corresponding to the transmission area, and At least one groove is disposed between two adjacent first dielectric patterns.

21. The transparent display device according to claim 13, wherein: The first dielectric further includes a spacer that maintains a gap between the first electrode and the second electrode, wherein the groove is provided at least on one side of the spacer, and Wherein, the spacer and the groove are arranged in a region corresponding to the non-transmission region.

22. The transparent display device according to claim 21, wherein: A plurality of first dielectric patterns and a plurality of protrusions are disposed between adjacent spacers.

23. The transparent display device according to claim 13, wherein: The transparent display panel further includes a light emitting device and a color filter disposed on the light emitting device, and Wherein, the groove is arranged to overlap with the light emitting device and the color filter.

24. A transparent display device, comprising: a transparent display panel including a transmission area for transmitting external light and a non-transmission area in which a plurality of pixels are arranged; as well as A light control panel, the light control panel comprising a dielectric layer, in, The dielectric layer includes a plurality of light-blocking particles capable of moving; The light control panel is configured to operate in a light blocking mode or a light transmitting mode; and For the light transmission mode, the light control panel is configured to move the plurality of light-blocking particles to an area corresponding to the non-transmission area.

25. The transparent display device according to claim 24, wherein: For the light transmission mode, the light control panel is configured to move all of the plurality of light-blocking particles to an area corresponding to the non-transmission area, and all of the plurality of light-blocking particles are not located in an area corresponding to the transmission area; and For the light-blocking mode, the light-control panel is configured such that the plurality of light-blocking particles exist in regions corresponding to the non-transmission region and the transmission region.

26. The transparent display device according to claim 24, wherein: The light control panel further includes a first electrode and a second electrode; The dielectric layer is disposed between the first electrode and the second electrode; and The light control panel is configured to operate in the light blocking mode or the light transmitting mode according to whether a voltage is applied to the first electrode and the second electrode.

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