KR102509022B1 - Light controlling device, and manufacturing method of transparent display device including the same - Google Patents

Abstract

The present invention provides a light control device for facilitating alignment between a light control device and a display panel, and a manufacturing method of a transparent display device including the same. A light control device according to an embodiment of the present invention includes a first base film including first pads disposed on one surface, and second pads disposed on a surface opposite to one surface of the first base film, A second base film having an opening area formed between two pads, a first flexible circuit board including a first common voltage wiring electrically connected to the second pads, and a driving voltage wiring electrically connected to the first pads and a second flexible circuit board including a second common voltage line electrically connected to the first common voltage line.

Description

Light control device, and method of manufacturing a transparent display device including the same

Embodiments of the present invention relate to a light control device and a method of manufacturing a transparent display device including the same.

BACKGROUND OF THE INVENTION [0002] As we enter the information age, the display field for processing and displaying a large amount of information has developed rapidly, and in response to this, various display devices have been developed and are in the spotlight. Specific examples of such a display device include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), an electric light emitting display device ( and Electroluminescence Display device (ELD), Organic Light Emitting Diodes (OLED), and the like.

Recently, display devices have become thinner, lighter, and have lower power consumption, and as a result, application fields of display devices are continuously increasing. In particular, the display device is used as one of the user interfaces in most electronic devices or mobile devices.

In addition, recently, research on a transparent display device that allows a user to see an object or a background located on the rear side of the display device due to its characteristics has been actively conducted. A transparent display device has advantages in space utilization, interior design, and design, and may have various application fields. The transparent display device can solve the spatial and visual limitations of existing electronic devices by implementing functions of information recognition, information processing, and information display with transparent electronic devices. For example, the transparent display device may be applied to a window of a building or a vehicle to be implemented as a smart window that shows a background or displays an image.

The transparent display device may be implemented as an organic light emitting display device, and in this case, has an advantage of low power consumption, but has a disadvantage in that the contrast ratio is lowered in a light environment, although there is no problem in the contrast ratio in a dark environment. A contrast ratio in a dark environment may be defined as a dark room contrast ratio and a contrast ratio in a light environment may be defined as a bright room contrast ratio. That is, since the transparent display device has a transmissive area to allow viewing of objects or backgrounds located on the rear side, there is a problem in that the bright-room contrast ratio is lowered. Therefore, when the transparent display device is implemented as an organic light emitting display device, a light control device capable of implementing a light-blocking mode for blocking light and a transmission mode for transmitting light is required in order to prevent deterioration of the bright-room contrast ratio.

The light control device includes a first base film and a second base film facing each other, a first electrode provided on one surface of the first base film, a second electrode provided on one surface of the second base film facing the first electrode, and an electrochromic layer provided between the first electrode and the second electrode. In the light control device, a circuit board for applying a voltage to the first electrode and the second electrode may be attached to one side edge of the first base film and one side edge of the second base film. A portion of the circuit board attached to the light control device may be exposed without being covered by the first base film and the second base film.

In the process of manufacturing a transparent display device, a light control device to which a circuit board is attached is aligned with a separately manufactured display panel using a guide. At this time, the guide is disposed on the side of the light control device, and may collide with an exposed circuit board that is not covered by the first base film and the second base film of the light control device. Due to this, there is a problem in that alignment between the light control device and the display panel is difficult. In addition, there is another problem that contact failure may occur as the circuit board collides with the guide.

The present invention provides a light control device for facilitating alignment between a light control device and a display panel, and a manufacturing method of a transparent display device including the same.

A light control device according to an embodiment of the present invention includes a first base film including first pads disposed on one surface, and second pads disposed on a surface opposite to one surface of the first base film, A second base film having an opening area formed between two pads, a first flexible circuit board including a first common voltage wiring electrically connected to the second pads, and a driving voltage wiring electrically connected to the first pads and a second flexible circuit board including a second common voltage line electrically connected to the first common voltage line.

A method of manufacturing a transparent display device according to an embodiment of the present invention includes attaching a first flexible circuit board to a light control device, inverting the light control device and bonding the inverted light control device to a transparent display panel, and and attaching the second flexible circuit board to the light control device.

In the present invention, the first flexible circuit board is attached to the exposed second pads not covered by the first base film, and the second flexible circuit board is attached to the exposed first pads not covered by the second base film. attached In the present invention, attachment between the first flexible circuit board and the second pads and attachment between the second flexible circuit board and the first pads are easy.

In addition, the present invention not only easily bonds the first flexible circuit board and the second flexible circuit board through the adhesive member equipped with the conductive ball, but also the first common voltage wires of the first flexible circuit board and the second flexible circuit board. The second common voltage lines of the board may be electrically connected. Through this, the present invention can simplify the manufacturing process.

In addition, in the present invention, after the first flexible circuit board is attached to the light control device, a bonding process of the light control device and the transparent display panel may be performed. In this case, the width of the first flexible circuit board may be equal to or smaller than that of the pad region. Accordingly, since the first flexible circuit board of the present invention is disposed within the pad area, there is no risk of the first flexible circuit board of the light control device colliding with a guide for alignment when the light control device and the transparent display panel are bonded together. does not exist.

In addition, in the present invention, the second flexible circuit board may be attached to the light control device after the bonding process of the light control device and the transparent display panel. Accordingly, in the present invention, when the light control device and the transparent display panel are bonded, there is no danger that the second flexible circuit board of the light control device collides with a guide for alignment, and there is no problem caused by this.

The effects obtainable in the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below. .

1 is a perspective view showing a transparent display device according to an exemplary embodiment of the present invention.
2 is a plan view illustrating a transparent display panel, a gate driver, a source drive IC, a flexible film, a display circuit board, and a timing controller of a transparent display device according to an exemplary embodiment of the present invention.
FIG. 3 is an exemplary diagram showing pixels of the display area of FIG. 2 .
FIG. 4 is a cross-sectional view taken along line I-I' of FIG. 3 .
5 is a plan view showing a light control device according to an embodiment of the present invention.
FIG. 6 is a plan view showing the first flexible circuit board of FIG. 5 .
FIG. 7 is a plan view showing the second flexible circuit board of FIG. 5 .
FIG. 8 is a cross-sectional view taken along line II' of FIG. 5, and FIG. 9 is a cross-sectional view taken along line II-II' of FIG.
FIG. 10 is a cross-sectional view taken along line III-III' of FIG. 5 . FIG. 11 is a cross-sectional view taken along line IV-IV' of FIG. 5 .
FIG. 12 is a cross-sectional view taken along line V-V' of FIG. 5 .
13 is a flowchart illustrating a method of manufacturing a transparent display device including a light control device according to an embodiment of the present invention.
14A to 14D are diagrams for explaining a method of manufacturing a transparent display device including a light control device according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments make the disclosure of the present invention complete, and those skilled in the art in the art to which the present invention belongs It is provided to fully inform the person of the scope of the invention, and the invention is only defined by the scope of the claims.

Since the shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining the embodiment of the present invention are exemplary, the present invention is not limited to the matters shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

When 'includes', 'has', 'consists', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal precedence relationship is described in terms of 'after', 'following', 'next to', 'before', etc. It can also include non-continuous cases unless is used.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

"X-axis direction", "Y-axis direction", and "Z-axis direction" should not be interpreted only as a geometric relationship in which the relationship between each other is made upright, and may be broader within the range in which the configuration of the present invention can function functionally. It can mean having a direction.

The term “at least one” should be understood to include all possible combinations from one or more related items. For example, "at least one of the first item, the second item, and the third item" means not only the first item, the second item, or the third item, respectively, but also two of the first item, the second item, and the third item. It may mean a combination of all items that can be presented from one or more.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other or can be implemented together in an association relationship. may be

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

1 is a perspective view showing a transparent display device according to an exemplary embodiment of the present invention. 2 is a plan view illustrating a transparent display panel, a gate driver, a source drive IC, a flexible film, a display circuit board, and a timing controller of a transparent display device according to an exemplary embodiment of the present invention. FIG. 3 is an exemplary diagram showing pixels of the display area of FIG. 2 . FIG. 4 is a cross-sectional view taken along line I-I' of FIG. 3 .

Hereinafter, a transparent display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 . 1 to 4 , the X axis represents a direction parallel to the gate line, the Y axis represents a direction parallel to the data line, and the Z axis represents the height direction of the transparent display device.

1 to 4, a transparent display device according to an embodiment of the present invention includes a transparent display panel 100, a gate driver 120, a source drive integrated circuit (hereinafter referred to as "IC") (130 ), a flexible film 140, a display circuit board 150, a timing controller 160, a light control device 200, and an adhesive layer 300.

The transparent display device according to the embodiment of the present invention has been described with a focus on those implemented as organic light emitting displays, but liquid crystal displays and quantum dot light emitting diodes have been described. ) or an electrophoresis display.

The transparent display panel 100 includes a first substrate 111 and a second substrate 112 facing each other. The second substrate 112 may be an encapsulation substrate. The first substrate 111 is formed to be larger than the second substrate 112 , and thus, a portion of the first substrate 111 may be exposed without being covered by the second substrate 112 .

The transparent display panel 100 transmits incident light or displays an image. Gate lines and data lines may be formed in the display area DA of the transparent display panel 100, and pixels may be formed in intersection areas of the gate lines and data lines. Pixels in the display area DA may display an image.

As shown in FIG. 3 , the display area DA includes a transmission area TA and an emission area EA. In the transparent display panel 100, an object or a background located on the rear surface of the transparent display panel 100 can be seen through the transparent areas TA, and an image can be displayed through the light emitting areas EA. . Although FIG. 3 illustrates that the transmission area TA and the light emitting area EA are formed long in the gate line direction (X-axis direction), it is not limited thereto. That is, the transmission area TA and the light emitting area EA may be formed long in the data line direction (Y-axis direction).

The transmission area TA is an area through which incident light passes almost as it is. The light emitting area EA is an area that emits light. The light emitting area EA may include a plurality of pixels P, and each of the pixels P may include a red light emitting part RE, a green light emitting part GE, and a blue light emitting part BE, as shown in FIG. 3 . It has been exemplified to include, but is not limited thereto. For example, each of the pixels P may further include a white light emitting part in addition to the red light emitting part RE, the green light emitting part GE, and the blue light emitting part BE. Alternatively, each of the pixels P may be a red light emitting part RE, a green light emitting part GE, a blue light emitting part BE, a yellow light emitting part, a magenta light emitting part, and a cyan light emitting part. Among the parts, at least two or more light emitting parts may be included.

The red light emitting part RE is an area emitting red light, the green light emitting part GE is an area emitting green light, and the blue light emitting part BE is an area emitting blue light. The red light emitting part RE, the green light emitting part GE, and the blue light emitting part BE of the light emitting area EA emit predetermined light and correspond to non-transmitting areas that do not transmit incident light.

A transistor T, an anode electrode AND, an organic layer EL, and a cathode electrode CAT are provided in each of the red light emitting part RE, the green light emitting part GE, and the blue light emitting part BE, as shown in FIG. 4 . It can be.

The transistor T includes an active layer ACT formed on the lower substrate 111, a first insulating film I1 formed on the active layer ACT, a gate electrode GE provided on the first insulating film I1, and a gate. A second insulating film I2 provided on the electrode GE, and a source electrode provided on the second insulating film I2 and connected to the active layer ACT through the first and second contact holes CNT1 and CNT2 ( SE) and a drain electrode DE. Although FIG. 4 illustrates that the transistor T is formed in a top gate method, it is not limited thereto, and the gate electrode GE may be formed in a bottom gate method in which the gate electrode GE is disposed under the active layer ACT.

The anode electrode AND is connected to the drain electrode DE of the transistor T through the third contact hole CNT3 penetrating the interlayer insulating film ILD provided on the source electrode SE and the drain electrode DE. . A bank B is provided between adjacent anode electrodes AND, so that the adjacent anode electrodes AND can be electrically insulated from each other.

An organic layer EL is provided on the anode electrode AND. The organic layer EL may include a hole transporting layer, an organic light emitting layer, and an electron transporting layer. A cathode electrode CAT is provided on the organic layer EL and the bank B. When voltage is applied to the anode electrode AND and the cathode electrode CAT, holes and electrons move to the organic light emitting layer through the hole transport layer and the electron transport layer, respectively, and combine with each other in the organic light emitting layer to emit light.

In FIG. 4 , the transparent display panel 100 is embodied in a top emission method, but is not limited thereto and may be implemented in a bottom emission method. The light control device 200 is preferably disposed in a direction opposite to the direction in which the transparent display panel 100 emits light. Accordingly, the light control device 200 is disposed under the transparent display panel 100, that is, under the lower substrate 111, in the top emission method, and above the transparent display panel 100, that is, the upper substrate, in the bottom emission method. It is preferably arranged above (112).

In the top emission method, since the organic layer EL emits light toward the upper substrate, the transistor T can be widely provided under the bank B and the anode AND. Accordingly, the top emission method has an advantage in that the design area of the transistor T is wider than that of the bottom emission method. In the top emission method, it is preferable that the anode electrode AND is formed of a highly reflective metal material such as aluminum or a laminated structure of aluminum and ITO, and the cathode electrode CAT is formed of a transparent metal material such as ITO or IZO. However, it is not necessarily limited thereto, and the cathode electrode CAT is made of silver (Ag), titanium (Ti), aluminum (Al), molybdenum (Mo), or silver (Ag) thinly formed to a thickness of several hundred Angstroms (Å) or less. ) and magnesium (Mg). In this case, the cathode electrode CAT becomes a transflective layer and can be used as a substantially transparent cathode.

As described above, each of the pixels P of the transparent display device according to the exemplary embodiment of the present invention includes a transmission area TA that passes incident light almost as it is and an emission area EA that emits light. . As a result, in the embodiment of the present invention, an object or a background located on the rear surface of the transparent display device can be viewed through the transparent areas TA of the transparent display device.

The gate driver 120 supplies gate signals to the gate lines according to the gate control signal input from the timing controller 160. 2 illustrates that the gate driver 120 is formed outside one side of the display area DA of the transparent display panel 100 by a gate driver in panel (GIP) method, but is not limited thereto. That is, the gate driver 120 may be formed on the outside of both sides of the display area DA of the transparent display panel 100 by the GIP method, or may be manufactured as a driving chip and mounted on a flexible film, and may be formed using a tape automated bonding (TAB) method. It may also be attached to the transparent display panel 100 in this way.

The source drive IC 130 receives digital video data and a source control signal from the timing controller 160 . The source driver IC 130 converts digital video data into analog data voltages according to a source control signal and supplies them to data lines. When the source drive IC 130 is manufactured as a driving chip, it may be mounted on the flexible film 140 in a chip on film (COF) or chip on plastic (COP) method.

Since the size of the first substrate 111 is greater than that of the second substrate 112 , a portion of the first substrate 111 may be exposed without being covered by the second substrate 112 . Display pads are provided on a portion of the first substrate 111 that is exposed and not covered by the second substrate 112 . The display pads may be data pads.

Wires connecting display pads and the source driver IC 130 and wires connecting display pads and wires of the display circuit board 150 may be formed on the flexible film 140 . The flexible film 140 is attached to the display pads using an anisotropic conducting film, and thereby the display pads and wires of the flexible film 140 can be connected.

The display circuit board 150 may be attached to the flexible films 140 . A plurality of circuits implemented as driving chips may be mounted on the display circuit board 150 . For example, the timing controller 160 may be mounted on the display circuit board 150 . The display circuit board 150 may be a printed circuit board or a flexible printed circuit board.

The timing controller 160 receives digital video data and timing signals from an external system board (not shown). The timing controller 160 generates a gate control signal for controlling the operation timing of the gate driver 120 and a source control signal for controlling the source drive ICs 130 based on the timing signal. The timing controller 160 supplies gate control signals to the gate driver 120 and supplies source control signals to the source drive ICs 130 .

The light control device 200 may block incident light in a light blocking mode and transmit incident light in a transmission mode. For example, the light control device 200 may be an electrochromic device, but is not necessarily limited thereto. An electrochromic device has an advantage of being able to switch from a transmissive mode to a shading mode or from a shading mode to a transmissive mode with a low driving voltage. In addition, since the electrochromic device only needs to apply a voltage when the mode is switched from the transmission mode to the shading mode or from the shading mode to the transmission mode, there is no need to continuously apply voltage to maintain the transmission mode or to maintain the shading mode. there is A detailed description of the light control device 200 according to various embodiments of the present invention will be described later in conjunction with FIGS. 5 to 15 .

The adhesive layer 300 bonds the transparent display panel 100 and the light control device 200 together. The adhesive layer 300 may be a transparent adhesive film such as optically clear adhesive (OCA) or a transparent adhesive such as optically clear resin (OCR). In this case, the adhesive layer 300 may have a refractive index between 1.4 and 1.9 to match the refractive index between the transparent display panel 100 and the light control device 200 .

Hereinafter, the light control device 200 will be described in detail with reference to FIGS. 5 to 12 .

5 is a plan view showing a light control device according to an embodiment of the present invention. 6 is a plan view showing the first flexible circuit board of FIG. 5, and FIG. 7 is a plan view showing the second flexible circuit board of FIG. FIG. 8 is a cross-sectional view taken along line II' of FIG. 5, FIG. 9 is a cross-sectional view taken along line II-II' of FIG. 5, and FIG. 10 is a cross-sectional view taken along line III-III' of FIG. FIG. 11 is a cross-sectional view taken along the line IV-IV' of FIG. 5, and FIG. 12 is a cross-sectional view taken along the line V-V' of FIG.

5 to 12 , the light control device 200 according to an embodiment of the present invention includes a light control area LCA, an adhesive member SL, and a pad area PA.

The light control area LCA is provided at a position corresponding to the display area DA of FIG. 2 . The adhesive member SL is provided between the first and second base films 210 and 220 and serves to adhere the first and second base films 210 and 220 . The adhesive member SL is disposed to surround the light control area LCA.

A flexible circuit board 260 is attached to the pad area PA. At this time, the flexible circuit board 260 includes a first flexible circuit board 262 and a second flexible circuit board 264 . The pad area PA includes a first pad area PA1 and a second pad area PA2. First pads 231 are provided in the first pad area PA1 , and second pads 241 are provided in the second pad area PA2 . The first pads 231 are electrically connected to the driving voltage wiring 273 provided on the second flexible circuit diagram 264 . The second pads 241 are electrically connected to the first common voltage line 271 provided on the first flexible circuit board 262 and the second common voltage line 272 provided on the second flexible circuit board 264 .

Specifically, the light control device 200 includes a first base film 210, a second base film 220, a first electrode 230, a second electrode 240, a light control layer 250, and a flexible circuit board. 260, and a voltage supply 280.

The first base film 210 and the second base film 220 are disposed to face each other. A portion of the first base film 210 may be exposed in the first pad area PA1 without being covered by the second base film 220 .

A portion of the second base film 220 may be exposed in the second pad area PA2 without being covered by the first base film 210 . As shown in FIG. 5 , the second base film 220 may have a sawtooth shape in the second pad area PA2 . More specifically, an opening region exposing the first flexible circuit board 262 is formed between the second pads 241 of the second base film 220 .

For example, the first base film 210 and the second base film 220 may include a cellulose resin such as triacetyl cellulose (TAC) or diacetyl cellulose (DAC), or a cyclo olefin (COP) such as norbornene derivatives. polymer), COC (cyclo olefin copolymer), PMMA (poly (methylmethacrylate), etc. acrylic resin, PC (polycarbonate), PE (polyethylene) or PP (polypropylene), polyolefin (PVA (polyvinyl alcohol), PES ( Polyester such as poly ether sulfone), PEEK (polyetheretherketone), PEI (polyetherimide), PEN (polyethylenenaphthalate), PET (polyethyleneterephthalate), PI (polyimide), PSF (polysulfone), or fluoride resin, etc. It may be a sheet or film containing, but is not limited thereto.

Meanwhile, in FIGS. 5 to 12 , the first base film 210 and the second base film 220 are described as having a film or sheet shape, but are not limited thereto. The first base film 210 and the second base film 220 may be formed of a glass substrate instead of a plastic film.

The first electrode 230 is provided on one surface of the first base film 210 facing the second base film 220 . The second electrode 240 is provided on one surface of the second base film 220 facing the first base film 210 . The first electrode 230 is connected to the first pads 231 and the second electrode 240 is connected to the second pads 241 . For example, the first and second electrodes 230 and 240 may include oxide (eg AgO or Ag2O or Ag2O3), aluminum oxide (eg Al2O3), tungsten oxide (eg WO2 or WO3 or W2O3), or magnesium oxide. (eg MgO), molybdenum oxide (eg MoO3), zinc oxide (eg ZnO), tin oxide (eg SnO2), indium oxide (eg In2O3), chromium oxide (eg CrO3 or Cr2O3), antimony oxide (eg Sb2O3 or Sb2O5), titanium oxide (eg TiO2), nickel oxide (eg NiO), copper oxide (eg CuO or Cu2O), vanadium oxide (eg V2O3 or V2O5), cobalt oxide (eg CoO ), iron oxide (eg Fe2O3 or Fe3O4), niobium oxide (eg Nb2O5), indium tin oxide (eg Indium Tin Oxide, ITO), indium zinc oxide (eg Indium Zinc Oxide, IZO), aluminum doped zinc It may be oxide (eg Aluminum doped Zinc Oxide, ZAO), aluminum doped tin oxide (eg Aluminum Tin Oxide, TAO) or antimony tin oxide (eg Antimony Tin Oxide, ATO), but is not limited thereto.

As shown in FIGS. 10 and 12 , the first pads 231 are disposed in the first pad area PA1 and on one surface of the first base film 210 that is exposed and not covered by the second base film 220 . provided The first pads 231 are electrically connected to the first electrode 230 to apply the first voltage supplied from the voltage supply unit 280 to the first electrode 230 . To this end, the first pads 231 are electrically connected to the driving voltage wiring 273 provided on the second flexible circuit board 264 . These first pads 231 may be simultaneously prepared through the same process as the first electrode 230 and may be made of the same material.

As shown in FIGS. 8 and 11 , the second pads 241 are disposed in the second pad area PA2 and on one surface of the second base film 220 that is exposed and not covered by the first base film 210 . provided The second pads 241 are electrically connected to the second electrode 240 to apply the second voltage supplied from the voltage supply unit 280 to the second electrode 240 . To this end, the second pads 241 are electrically connected to the first common voltage line 271 provided on the first flexible circuit board 262 and the second common voltage line 272 provided on the second flexible circuit board 264. Connected. These second pads 241 may be simultaneously prepared through the same process as the second electrode 240 and may be made of the same material.

The light transmittance of the light control layer 250 varies depending on the voltage applied to the first electrode 230 and the second electrode 240 . For example, when no voltage is applied to the first electrode 230 and the second electrode 240, the light transmittance of the light control layer 250 may be β% or more, and thus, a transmission mode may be implemented. When a voltage is applied to the first electrode 230 and the second electrode 240, the light transmittance of the light control layer 250 may be less than α%, and accordingly, a light blocking mode may be implemented.

The light control layer 250 includes a light transmittance variable material that changes light transmittance according to a voltage applied to the first electrode 230 and the second electrode 240 .

The variable light transmittance material according to an embodiment of the present invention may include an electrochromic material in which an electrochemical redox reaction occurs when a voltage is applied to the first electrode 230 and the second electrode 240, and thereby changes color. can

For example, when a voltage is applied to the first electrode 230 and the second electrode 240, a reduction reaction occurs in the electrochromic material, and the reduction reaction causes the electrochromic material to change to a predetermined color such as black or blue. Accordingly, the light control device 200 may implement a light blocking mode to block incident light.

In addition, when voltage is not applied to the first electrode 230 and the second electrode 240, an oxidation reaction occurs in the electrochromic material and becomes transparent due to the oxidation reaction. Accordingly, the light control device 200 may implement a transmission mode in which incident light is transmitted as it is.

Such an electrochromic material may be a material that absorbs a predetermined color when a reduction reaction occurs and becomes transparent when an oxidation reaction occurs. For example, electrochromic materials include viologen (1,1'-dibenzyl-4,4'-bipyridinium bistetrafluorborate), HVBF2 (1,1'-diheptyl-4,4'-bipyridinium dibromide), PVBr2 (1, 1'-dipropyl-4,4'-bipyridinium dibromide), BVBF4 (1,1'-dibenzyl-4,4'-bipyridinium bistetrafluorborate), 1-benzyl-4,4'-bipyridinium chloride, 1,1'-bis (4-4chloromethyl)benzyl)-4,4'-bipyridinium dichloride, 1,1'-bis(4-bromobutyl)-4,4'-bipyridinium dibromide or 1,1'-bis(2-bromoethyl)-4, It may be 4'-bipyridinium dibromide, but is not limited thereto.

The variable light transmittance material according to an embodiment of the present invention may further include a counter material that assists the electrochromic material to smoothly undergo a redox reaction. At this time, the electrochromic material and the counter material may be dissolved in a liquid or gel of the same layer. When a reduction reaction occurs in the electrochromic material, the counter material undergoes an oxidation reaction opposite to that of the electrochromic material, and absorbs a predetermined color through the oxidation reaction, thereby taking on a predetermined color. When an oxidation reaction occurs in the electrochromic material, the counter material undergoes a reduction reaction opposite to that of the electrochromic material, and becomes transparent by the reduction reaction. Counter substances are TMPD (N,N,N',N'-tetramethyl-1,4-phenylenediamine), TMB (3,3',5,5'-Tetramethylbenzidine), NTMB (N,N,N',N' -Tetramethylbenzidine) or DAB (3,3'-Diaminobenzidine).

The variable light transmittance material according to an embodiment of the present invention may further include an electrolyte. In this case, the electrochromic material and the electrolyte may be dissolved in a liquid or gel of the same layer. The electrolyte provides cations and anions so that the electrochromic material can undergo a redox reaction. The electrolyte may be Lithium perchlorate, t-butylammoinum perchlorate, t-butylammoinum-t-fluoroborate, trifluoromethanesulfonate or tetrabutylammonium trifluoromethanesulfonate.

The light transmittance variable material according to an embodiment of the present invention may include an electrochromic material, a counter material, and an electrolyte. In this case, the electrochromic material, the counter material, and the electrolyte may be dissolved in a liquid or gel of the same layer.

A material with varying light transmittance according to another embodiment of the present invention may include liquid crystals, dichroic dyes, and ionic materials. The variable light transmittance material according to another embodiment of the present invention implements a transmission mode in which incident light is transmitted when voltage is not applied to the first electrode 230 and the second electrode 240, and the first electrode 230 And when a voltage is applied to the second electrode 240, a light-blocking mode may be implemented in which incident light is blocked.

When the light transmittance variable material includes liquid crystals, the light control device 200 includes a first alignment layer provided on one side of the first base film 210 facing the second base film 220, and a first base film ( 210), a second alignment layer may be further provided on one surface of the second base film 220 facing each other.

More specifically, liquid crystals of positive polarity are aligned in the vertical direction (Z-axis direction) by the first and second alignment layers even though voltage is not applied to the first electrode 230 and the second electrode 240 in the long axis direction of the liquid crystals. can be picked up The long axis direction of the dichroic dyes may also be aligned in the vertical direction (Z-axis direction) by the first and second alignment layers even if voltage is not applied to the first electrode 230 and the second electrode 240 like liquid crystals. . Accordingly, the light control device 200 may operate in a transmission mode even when no voltage is applied.

Dichroic dyes can be dyes that absorb light. For example, dichroic dyes are black dye that absorbs all of the visible light wavelength range, or absorbs light other than the wavelength range of a specific color (eg red) and wavelength range of a specific color (eg red). It may be a dye that reflects the light of In the embodiment of the present invention, dichroic dyes have been described mainly as black dyes, but are not limited thereto. For example, the dichroic dyes may be dyes having a color of any one of red, green, blue, and yellow, or a mixture thereof. That is, the embodiment of the present invention can block the background while expressing various colors in the light blocking mode. Due to this, since the embodiment of the present invention can provide various colors in the light blocking mode, the user can feel the aesthetic sense. For example, the transparent display device according to an embodiment of the present invention can be used in a public place, and when applied to a smart window or public window requiring a transmission mode and a shading mode, various colors are expressed depending on time or place. You can shade while doing it.

The ionic materials play a role in allowing liquid crystals and dichroic dyes to move randomly. The ionic materials may have a predetermined polarity, and thus may move to the first electrode 230 or the second electrode 240 according to the polarity of the voltage applied to the first electrode 230 and the second electrode 240. there is. For example, when ionic materials have a negative polarity, when a positive voltage is applied to the first electrode 230 and a negative voltage is applied to the second electrode 240, the ionic materials are transferred to the first electrode 230. move In addition, when the ionic materials have a negative polarity, when a positive voltage is applied to the second electrode 240 and a negative voltage is applied to the first electrode 230, the ionic materials move to the second electrode 240. . In addition, when the ionic materials have a positive polarity, when a positive voltage is applied to the first electrode 230 and a negative voltage is applied to the second electrode 240, the ionic materials move to the second electrode 240. . In addition, when the ionic materials have a positive polarity, when a positive voltage is applied to the second electrode 240 and a negative voltage is applied to the first electrode 230, the ionic materials move toward the first electrode 230. . Therefore, when a voltage is applied to the first electrode 230 and the second electrode 240, the ionic materials move from the first electrode 230 to the second electrode 240 at a predetermined cycle and then back to the first electrode 230. The return movement is repeated. In this case, since the ionic materials collide with the liquid crystals and the dichroic dyes while moving, the liquid crystals and the dichroic dyes move randomly. In this case, since light incident on the light control layer 250 may be scattered by randomly moving liquid crystals or absorbed by dichroic dyes, a light blocking mode may be realized.

The flexible circuit board 260 includes a first flexible circuit board 262 and a second flexible circuit board 264 . As shown in FIG. 9 , the second flexible circuit board 264 is attached to the exposed first flexible circuit board 262 without being covered by the second base film 220 . The first flexible circuit board 262 is bonded to the second flexible circuit board 264 through a second adhesive member 292 . The second adhesive member 292 may have conductive balls 293a therein.

The first flexible circuit board 262 is disposed in the second pad area PA2 and overlaps the second pads 241 as shown in FIGS. 8 and 11 . The first flexible circuit board 262 is not disposed in the first pad area PA1 as shown in FIG. 6 . The first flexible circuit board 262 is attached to one surface of the second pads 241 exposed and not covered by the first base film 210, and is electrically connected to the second pads 241. The first flexible circuit board 262 has a rectangular bar shape as shown in FIG. 6 , and is not covered by the second base film 220 and partially exposed in an opening formed in the second base film 220 . A width of the first flexible circuit board 262 may be equal to or smaller than that of the second pad area PA2 . Accordingly, the first flexible circuit board 262 may be disposed in the second pad area PA2.

The first flexible circuit board 262 includes first common voltage lines 271 , a first protective film 274 and a second protective film 275 .

The first common voltage lines 271 are electrically connected to the second pads 241 . The first common voltage lines 271 apply the second voltage supplied from the voltage supply unit 280 to the second electrode 240 through the second common voltage lines 272 . A first adhesive member 291 may be provided between the first common voltage lines 271 and the second pads 241 . The first adhesive member 291 has a conductive ball 291a inside, so that the first common voltage wires 271 and the second pads 241 can be electrically connected through the conductive ball 291a. .

These first common voltage lines 271 may be electrically connected to the voltage supply unit 280 through second common voltage lines 272 provided on the second flexible circuit board 264 . The first common voltage lines 271 are bonded to the second flexible circuit board 264 by the second adhesive member 292 from the area where the second pads 241 are adhered by the first adhesive member 291. area can be extended. The first common voltage wires 271 may be electrically connected to the second common voltage wires 272 connected to the second flexible circuit board 264 through the conductive balls 293a provided on the second adhesive member 292. can

The first protective film 274 is provided on the first common voltage lines 271 to protect the first common voltage lines 271 . The second protective film 275 is provided under the first common voltage lines 271 to protect the first common voltage lines 271 .

One side of the first common voltage lines 271 adjacent to the second pads 241 are exposed without being covered by the first protective film 274 . One side of the exposed first common voltage lines 271 and the second pads 241 are bonded by the first adhesive member 291 as shown in FIG. 8, so that the first common voltage lines 271 and the second pads ( 241) are electrically connected.

In addition, one side of the first common voltage lines 271 adjacent to the second common voltage lines 272 of the second flexible circuit board 264 is exposed without being covered by the first protective film 274 . One side of the exposed first common voltage lines 271 and the second common voltage lines 272 are bonded by the second adhesive member 292 as shown in FIG. 9, so that the first common voltage lines 271 and the second common voltage lines 271 and the second The common voltage wires 272 are electrically connected. As a result, the second common voltage lines 272 and the second pads 241 are electrically connected.

As shown in FIG. 10 , the second flexible circuit board 264 is disposed in the first pad area PA1 and overlaps the first pads 231 . Also, the second flexible circuit board 264 is disposed in the second pad area PA2 as shown in FIG. 11 and overlaps the first flexible circuit board 262 electrically connected to the second pads 241 .

As shown in FIG. 10 , the second flexible circuit board 264 is attached to one surface of the first pads 231 exposed and not covered by the second base film 220 in the first pad area PA1, It is electrically connected to the pads 231 . As shown in FIG. 9 , the second flexible circuit board 264 is attached to one surface of the first flexible circuit board 262 exposed in correspondence with the opening area of the first base film 210 in the second pad area PA2. , is electrically connected to the first flexible circuit board 262. The second flexible circuit board 264 includes second common voltage lines 272 , driving voltage lines 273 , a third protective film 276 and a fourth protective film 277 .

The second common voltage lines 272 are disposed in the second pad area PA2 as shown in FIGS. 9 and 11 and are electrically connected to the first common voltage lines 271 of the first flexible circuit board 264. . The second common voltage lines 272 apply the second voltage supplied from the voltage supply unit 280 to the second electrode 240 through the first common voltage lines 271 . The second common voltage lines 272 may extend from the voltage supply unit 280 to an area where the second adhesive member 292 adheres to the first flexible circuit board 262 . A second adhesive member 292 may be provided between the second common voltage lines 272 and the first common voltage lines 271 . The second adhesive member 292 has a conductive ball 292a therein to electrically connect the second common voltage lines 272 and the first common voltage lines 271 through the conductive ball 292a. can

The driving voltage lines 273 are disposed in the first pad area PA1 and electrically connected to the first pads 231 as shown in FIGS. 10 and 12 . The driving voltage lines 273 apply the first voltage supplied from the voltage supply unit 280 to the first electrode 230 . The driving voltage wires 273 may extend from the voltage supply unit 280 to an area where the first pads 231 are bonded by the third adhesive member 293 . A third adhesive member 293 may be provided between the driving voltage wires 273 and the first pads 231 . The third adhesive member 293 has a conductive ball 293a therein, so that the driving voltage wires 273 and the first pads 231 can be electrically connected through the conductive ball 293a. Meanwhile, the driving voltage lines 273 may be formed on the same layer as the second common voltage lines 272 and do not overlap with the second common voltage lines 272 .

The third protective film 276 is provided on the second common voltage wires 272 and the driving voltage wires 273 to protect the second common voltage wires 272 and the driving voltage wires 273 . The fourth protective film 277 is provided under the second common voltage lines 272 and the driving voltage lines 273 to protect the second common voltage lines 272 and the driving voltage lines 273 .

One side of the second common voltage lines 272 adjacent to the first common voltage lines 271 of the first flexible circuit board 262 is not covered by the third protective film 276 and is exposed. One side of the exposed second common voltage wires 272 and the first common voltage wires 271 are bonded by the second adhesive member 292, so that the first common voltage wires 271 and the second common voltage wires ( 272) are electrically connected.

In addition, one side of the driving voltage wires 273 adjacent to the first pads 231 is exposed without being covered by the third protective film 276 . One side of the exposed driving voltage wires 273 and the first pads 231 are bonded by a third adhesive member 293, so that the driving voltage wires 273 and the first pads 231 are electrically connected.

The voltage supply unit 280 is provided on one side of the second flexible circuit board 264 . The voltage supply unit 280 is electrically connected to the second flexible circuit board 264 . The voltage supply unit 280 is electrically connected to the driving voltage lines 273 and supplies a first voltage to the first electrode 230 through the driving voltage lines 273 . The voltage supply unit 280 is electrically connected to the second common voltage lines 272, and the first common voltage line 271 is connected to each of the second common voltage lines 272 and the second common voltage lines 272. ) through which the second voltage is supplied to the second electrode 240 .

Additionally, the light control device 200 according to an embodiment of the present invention may further include a lower plate (not shown). The lower plate may be disposed below the first base film 210 . The lower plate supports the first base film 210 , the second base film 220 , and the light control layer 250 provided between the first base film 210 and the second base film 220 . For example, the lower plate may be a transparent tempered glass substrate or a transparent plastic substrate, but is not necessarily limited thereto.

13 is a flowchart illustrating a method of manufacturing a transparent display device including a light control device according to an embodiment of the present invention. 14A to 14D are diagrams for explaining a method of manufacturing a transparent display device including a light control device according to an embodiment of the present invention. A method of manufacturing a light control device according to an embodiment of the present invention will be described in detail in conjunction with FIGS. 13 and 14a to 14d.

First, as shown in FIG. 14A , the first base film 210 and the second base film 220 are bonded (S1301).

The first base film 210 and the second base film 220 are disposed to face each other. A portion of the first base film 210 may be exposed in the first pad area PA1 without being covered by the second base film 220 . A portion of the second base film 220 may be exposed in the second pad area PA2 without being covered by the first base film 210 . The second base film 220 may have a sawtooth shape in the second pad area PA2 . An opening region exposing the first flexible circuit board 262 may be formed between the second pads 241 of the second base film 220 . For example, the first base film 210 and the second base film 220 may include a cellulose resin such as triacetyl cellulose (TAC) or diacetyl cellulose (DAC), or a cyclo olefin (COP) such as norbornene derivatives. polymer), COC (cyclo olefin copolymer), PMMA (poly (methylmethacrylate), etc. acrylic resin, PC (polycarbonate), PE (polyethylene) or PP (polypropylene), polyolefin (PVA (polyvinyl alcohol), PES ( Polyester such as poly ether sulfone), PEEK (polyetheretherketone), PEI (polyetherimide), PEN (polyethylenenaphthalate), PET (polyethyleneterephthalate), PI (polyimide), PSF (polysulfone), or fluoride resin, etc. It may be a sheet or film containing, but is not limited thereto.

In this case, a first electrode 230 connected to the first pads 231 in the first pad area PA1 may be provided on the first base film 210 . A second electrode 240 connected to the second pads 241 in the second pad area PA2 may be provided on the second base film 220 . The first and second electrodes 230 and 240 may include oxide (eg AgO or Ag2O or Ag2O3), aluminum oxide (eg Al2O3), tungsten oxide (eg WO2 or WO3 or W2O3), magnesium oxide (eg MgO ), molybdenum oxide (eg MoO3), zinc oxide (eg ZnO), tin oxide (eg SnO2), indium oxide (eg In2O3), chromium oxide (eg CrO3 or Cr2O3), antimony oxide (eg Sb2O3) or Sb2O5), titanium oxide (eg TiO2), nickel oxide (eg NiO), copper oxide (eg CuO or Cu2O), vanadium oxide (eg V2O3 or V2O5), cobalt oxide (eg CoO), iron oxide (eg Fe2O3 or Fe3O4), niobium oxide (eg Nb2O5), indium tin oxide (eg Indium Tin Oxide, ITO), indium zinc oxide (eg Indium Zinc Oxide, IZO), aluminum doped zinc oxide (eg; Aluminum doped Zinc Oxide (ZAO), aluminum doped tin oxide (eg Aluminum Tin Oxide, TAO) or antimony tin oxide (eg Antimony Tin Oxide, ATO), but is not limited thereto. A light control layer 250 may be provided on the first electrode 230 or the second electrode 240 .

The first base film 210 and the second base film 220 may be adhered to each other by an adhesive member SL provided on the first base film 210 or the second base film 220 .

Second, as shown in FIG. 14B, the first flexible circuit board 262 is attached to the second pads 241 (S1302).

The first flexible circuit board 262 may be attached to one surface of the second pads 241 exposed without being covered by the first base film 210 . First common voltage lines 271 may be formed on the first flexible circuit board 262 . The first common voltage lines 271 of the first flexible circuit board 262 are attached to one surface of the second pads 241 using the first adhesive member 291, and electrically connect to the second pads 241. can be connected to The first adhesive member 291 has a conductive ball 291a inside, so that the first common voltage wires 271 and the second pads 241 can be electrically connected through the conductive ball 291a. .

Thirdly, as shown in FIG. 14C, the light control device 200 is placed on the transparent display panel 100 (S1303).

The light control device 200 may be attached on the transparent display panel 100 using the adhesive layer 300 . At this time, the light control device 200 may be inverted and attached to the transparent display panel 100 . Accordingly, the first flexible circuit board 262 may be disposed under the second base film 220, and the first pads 231 provided on the first base film 210 may be exposed upward.

The light control device 200 may be aligned with the separately manufactured transparent display panel 100 using the guide G. At this time, the guide G may be disposed on the side of the light control device 200 and the transparent display panel 100 .

Fourth, as shown in FIG. 14D, the second flexible circuit board 264 is attached on the first pads 231 and the first common voltage lines 271 (S1304).

The second flexible circuit board 264 may be attached to one surface of the exposed first pads 231 in the first pad area PA1 that is not covered by the second base film 220 . Driving voltage wires 273 may be formed on the second flexible circuit board 264 . The driving voltage wires 273 of the second flexible circuit board 264 are attached to one surface of the first pads 231 using the third adhesive member 293 to be electrically connected to the first pads 231. can The third adhesive member 293 has a conductive ball 293a therein, so that the driving voltage wires 273 and the first pads 231 can be electrically connected through the conductive ball 293a.

Accordingly, the first voltage supplied from the voltage supply unit 280 may be applied to the first electrode 230 connected to the first pads 231 through the driving voltage lines 273 .

In addition, the second flexible circuit board 264 may be attached to one surface of the first flexible circuit board 262 exposed in the second pad area PA2 corresponding to the opening area of the first base film 210 . . In the second flexible circuit board 264 , second common voltage lines 272 may be formed. The second common voltage wires 272 of the second flexible circuit board 264 are attached to one surface of the first flexible circuit board 262 using a second adhesive member 292, so that the first common voltage wires 271 ) can be electrically connected to The second adhesive member 292 has a conductive ball 292a therein to electrically connect the first common voltage lines 271 and the second common voltage lines 272 through the conductive ball 292a. can

Accordingly, the second voltage supplied from the voltage supply unit 280 is applied to the second electrode 240 connected to the second pads 241 through the second common voltage lines 272 and the first common voltage line 271. can be authorized.

In the light control device 200 according to an embodiment of the present invention, the first flexible circuit board 262 is attached to the exposed second pads 241 that are not covered by the first base film 210, and 2 flexible circuit boards 264 are attached to the exposed first pads 231 without being covered by the second base film 220 .

When one flexible circuit board is disposed between the first base film 210 and the second base film 220, one flexible circuit board is formed between the first pads of the first base film 210 and the second base film. It must be attached to the second pads of (220). In this case, it is easy to attach the flexible circuit board in alignment with the first pads of the first base film 210 as well as the second pads of the second base film 220 formed in the opposite direction to the first pads. don't Also, connection failure may occur because the flexible circuit board is not attached to the correct positions of the first pads and the second pads.

Unlike this, the light control device 200 according to an embodiment of the present invention uses the first flexible circuit board 262 and the second flexible circuit board 264 to supply the first pad 231 from the voltage supply unit 280. A voltage may be supplied to each of the first and second pads 241 . First, a first flexible circuit board 262 may be attached to the light control device 200 according to an embodiment of the present invention. The first flexible circuit board 262 may be electrically connected to the second pads 241 . The first flexible circuit board 262 has a bar shape and is not formed to deviate from the second pad area PA2 of the second base film 220 . That is, the first flexible circuit board 262 may be formed in the second pad area PA2.

Next, the light control device 200 according to an embodiment of the present invention is inverted and attached to the transparent display panel 100 . At this time, the light control device 200 and the transparent display panel 100 may be aligned by the guide G disposed on the side.

Next, the second flexible circuit board 264 on which the voltage supply unit 280 is formed may be attached to the light control device 200 after the light control device 200 and the transparent display panel 100 are bonded together.

The light control device 200 fabricated as described above is bonded to the transparent display panel 100 because the first flexible circuit board 262 is formed in the second pad area PA2 of the second base film 220 unlike the prior art. There is no danger of colliding the flexible circuit board 260 with the guide G for alignment, and no problems arise accordingly.

In addition, since the second pads 241 are exposed upward when the first flexible circuit board 262 is attached, it is easy to attach the first flexible circuit board 262, and the first flexible circuit board 262 It can be attached to the exact location. In addition, since the first pads 231 are exposed upward when the second flexible circuit board 264 is attached, it is easy to attach the second flexible circuit board 264, and the second flexible circuit board 264 It can be attached to the exact location.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be variously modified and implemented without departing from the technical spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The protection scope of the present invention should be construed according to the claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: transparent display panel
111: first substrate 112: second substrate
120: gate driver 130: source drive IC
140: flexible film 150: circuit board for display
160: timing controller 200: light control device
210: first base film 220: second base film
230: first electrode 231: first pad
240: second electrode 241: second pad
250: light control layer 260: flexible circuit board
262: first flexible circuit board 264: second flexible circuit board
280: voltage supply unit 300: adhesive layer

Claims (18)

a first base film including a first pad region on one surface on which first pads are disposed;
a second base film including a second pad area in which second pads are disposed on one surface facing the first base film;
a first flexible circuit board including a first common voltage line disposed to overlap the second pad area and electrically connected to the second pads; and
A driving voltage line disposed to overlap the first pad area and electrically connected to the first pads, and a second common voltage line disposed to overlap the second pad area and electrically connected to the first common voltage line. Including a second flexible circuit board comprising a,
The second pad region includes an opening region exposing a portion of the first common voltage line of the first flexible circuit board between the second pads;
A part of the second common voltage line of the second flexible circuit board is arranged to face a part of the first common voltage line of the first flexible circuit board exposed by the opening area in the second pad area. According to claim 1,
The light control device according to claim 1 , wherein the driving voltage wiring and the second common voltage wiring are formed on the same layer. According to claim 1,
The light control device according to claim 1 , wherein the first flexible circuit board is not covered by the second base film in the opening area. According to claim 3,
The light control device according to claim 1 , wherein the second flexible circuit board is connected to the first flexible circuit board in a region where the first flexible circuit board is not covered by the second base film. According to claim 4,
and an adhesive member disposed between the connecting second flexible circuit board and the first flexible circuit board. According to claim 5,
The light control device of claim 1, wherein the adhesive member includes a conductive ball electrically connecting the first common voltage line of the first flexible circuit board and the second common voltage line of the second flexible circuit board. According to claim 1,
The light control device according to claim 1 , wherein the first pads are not covered by the second base film, and the second pads are not covered by the first base film. According to claim 1,
and a voltage supply unit provided on one side of the second flexible circuit board to supply a first voltage to the driving voltage line and to supply a second voltage to the second common voltage line. According to claim 1,
The light control device according to claim 1 , wherein the first flexible circuit board is not formed in the first pad area and is formed in the second pad area. According to claim 1,
The light control device according to claim 1 , wherein the first flexible circuit board has a width equal to or smaller than that of the second pad area. According to claim 1,
first electrodes provided on one surface of the first base film and connected to the first pads;
a second electrode provided on one surface of the second base film and connected to the second pads; and
and a light control layer disposed between the first electrode and the second electrode and including a light transmittance variable material that changes light transmittance according to a voltage applied to the first electrode and the second electrode. Device. A first base film including a first pad area on one surface on which first pads are disposed, and a second base film including a second pad area on a surface opposite to one surface of the first base film, on which second pads are disposed. forming a light control device by adhering the base film;
attaching a first flexible circuit board to a second pad area of the light control device;
inverting the light control device and attaching the inverted light control device to the transparent display panel; and
attaching a second flexible circuit board to the first pad area and the second pad area of the light control device;
The second pad area includes an opening area exposing a portion of the first flexible circuit board between the second pads,
The second flexible circuit board is arranged to face the first flexible circuit board exposed by the opening area in the second pad area. delete According to claim 12,
The method of manufacturing a transparent display device according to claim 1 , wherein the transparent display panel is disposed under the first base film. delete According to claim 12,
The method of manufacturing a transparent display device according to claim 1 , wherein the first flexible circuit board is not covered by the second base film in the opening area. 13. The method of claim 12, wherein the step of attaching the second flexible circuit board,
and attaching the second flexible circuit board on the first pads and the first flexible circuit board. According to claim 17,
The method of manufacturing a transparent display device according to claim 1 , wherein the second flexible circuit board is attached to the first flexible circuit board exposed by the opening area.

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