KR102374549B1 - Light controlling device and transparent display device including the same - Google Patents

Abstract

Embodiments of the present invention relate to a light control device capable of improving light transmittance and realizing a fast response speed in a transparent mode, a transparent display device including the same, and a manufacturing method thereof. A light control device according to an embodiment of the present invention includes a first and second substrates facing each other, and a first barrier rib disposed between the first and second substrates to maintain a gap between the first and second substrates. and a second barrier rib, a first electrode disposed on a side surface of the first barrier rib facing the second barrier rib, a second electrode disposed on a side surface of the second barrier rib facing the first barrier rib, and the first electrode and the second barrier rib It is disposed between the electrodes and includes a light transmittance variable material whose light transmittance varies according to a voltage applied to the first electrode and the second electrode.

Description

LIGHT CONTROLLING DEVICE AND TRANSPARENT DISPLAY DEVICE INCLUDING THE SAME

An embodiment of the present invention relates to a light control device and a transparent display device including the same.

Recently, as the information age has entered, the field of display for processing and displaying a large amount of information has been rapidly developed, and various display devices have been developed and spotlighted in response to this. 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 electroluminescence display device ( Electroluminescence display device: ELD), organic light emitting device (Organic Light Emitting Diodes: OLED), and the like.

In recent years, display devices have become thinner, lighter, and lower in power consumption, and thus, the field of application of the display devices continues to increase. 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 surface of the display device has been actively conducted due to its characteristics. The transparent display device has advantages of space utilization, interior and design, and may have various application fields. The transparent display device can solve the spatial and visual constraints of existing electronic devices by implementing the functions of information recognition, information processing, and information display as a transparent electronic device. For example, the transparent display device may be implemented as a smart window that is applied to a window of a building or a vehicle to show a background or display an image.

The transparent display device may be implemented as an organic light emitting display device, and in this case, the power consumption is small, but there is no problem in the contrast ratio in a dark environment, but there is a disadvantage in that the contrast ratio is lowered in a general environment in which there is light. Therefore, when the transparent display device is implemented as an organic light emitting display device, there is a need for a light control device capable of implementing a light blocking mode for blocking light and a transmission mode for transmitting light in order to prevent a decrease in contrast ratio.

The light control device may be implemented in a transmission mode that transmits light in a state in which no voltage is applied, and has the advantage of being able to switch from the transmission mode to the light blocking mode with a low driving voltage. In this case, the light control device uses a transparent electrode such as indium tin oxide (eg, Indium Tin Oxide, ITO) or indium zinc oxide (eg, Indium Zinc Oxide, IZO) for voltage application. Such a light control device has a disadvantage in that light transmits through the transparent electrode in the transmission mode, thereby reducing transmittance.

In addition, the light control device has disadvantages in that the response speed is lowered due to the high resistance value per unit area of the transparent electrode, and yellowish phenomenon occurs due to the transparent electrode.

An embodiment of the present invention provides a light control device capable of improving light transmittance in a transparent mode and realizing a fast response speed, and a transparent display device including the same.

A light control device according to an embodiment of the present invention includes a first and second substrates facing each other, and a first barrier rib disposed between the first and second substrates to maintain a gap between the first and second substrates. and a second barrier rib, a first electrode disposed on a side surface of the first barrier rib facing the second barrier rib, a second electrode disposed on a side surface of the second barrier rib facing the first barrier rib, and the first electrode and the second barrier rib It is disposed between the electrodes and includes a light transmittance variable material whose light transmittance varies according to a voltage applied to the first electrode and the second electrode.

A transparent display device according to an embodiment of the present invention includes a transparent display panel including transmissive regions for transmitting incident light and light emitting regions for emitting light, and is disposed on one surface of the transparent display panel and transmits incident light A light control device capable of a mode and a light blocking mode for blocking incident light is provided. The light control device includes a first substrate and a second substrate facing each other, a plurality of first barrier ribs disposed between the first substrate and the second substrate to maintain a gap between the first substrate and the second substrate, the first substrate and a plurality of second barrier ribs alternately disposed with the first barrier ribs between the second substrates and maintaining a gap between the first substrate and the second substrate, on a side surface of the first barrier rib facing adjacent second barrier ribs The first electrode disposed on and a light control layer including a light transmittance variable material whose light transmittance is changed according to the applied voltage.

A method of manufacturing a light control device according to an embodiment of the present invention includes the steps of alternately forming a first barrier rib and a second barrier rib on a first substrate, patterning a first electrode on the first barrier rib, and forming a first barrier rib on the second barrier rib patterning the second electrode, injecting a liquid-state variable light transmittance material between the first barrier ribs patterned with the first electrode and the second barrier ribs patterned with the second electrode, and a second substrate on the light transmittance variable material It includes the step of cementing.

According to the present invention, as the first electrode and the second electrode of the light control device are formed to correspond to the light emitting area of the transparent display panel, light incident on the transmission area of the transparent display panel is lost by the first electrode and the second electrode can be prevented from becoming

In the present invention, since the first and second electrodes of the light control device are not formed in the transparent region of the transparent display panel, an opaque electrode having a low resistance per unit area can be used for the first and second electrodes. Accordingly, the light control device can reduce the time it takes for the electrochromic material to change color, thereby reducing the time it takes to change from the transmissive mode to the light-shielding mode or the time it takes to change the light-shielding mode to the transmissive mode.

In addition, according to the present invention, when the first and second electrodes of the light control device are formed in the transmissive area of the transparent display panel and the transparent electrode is formed using the first and second electrodes, a yellowish phenomenon that may occur occurs. I never do that.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. .

1 is a perspective view showing a transparent display device according to an embodiment of the present invention.
2 is a plan view illustrating a transparent display panel, a gate driver, a source drive integrated circuit, a flexible film, a 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 view showing a pixel of the display area of FIG. 2 .
4 is a cross-sectional view taken along line I-I' of FIG. 3 .
5 is a perspective view illustrating a light control device according to an embodiment of the present invention.
6 is a plan view showing a light control device according to an embodiment of the present invention.
7 is a cross-sectional view taken along line II′ of FIG. 6 .
8 is a cross-sectional view taken along line II-II' of FIG. 6 .
9 is a cross-sectional view taken along line III-III' of FIG. 6 .
10 is a cross-sectional view showing a modified embodiment of the present invention.
11 is a cross-sectional view showing another modified embodiment of the present invention.
12 is a flowchart illustrating a method of manufacturing a light control device according to an embodiment of the present invention.
13A to 13D are cross-sectional views for explaining a method of manufacturing a light control device according to an embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent 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, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative and the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

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

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between two parts unless 'directly' is used.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal relationship is described with 'after', 'following', 'after', 'before', etc. It may include cases that are not continuous unless this is used.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the 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 vertical, and is wider than within the scope where the configuration of the present invention can function functionally. It may mean having a direction.

The term “at least one” should be understood to include all possible combinations of one or more related items. For example, the meaning of “at least one of the first, second, and third items” means that each of the first, second, or third items as well as two of the first, second and third items It may mean a combination of all items that can be presented from more than one.

Each feature of the various embodiments of the present invention can be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or implemented together in a related 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 embodiment of the present invention. 2 is a plan view illustrating a transparent display panel, a gate driver, a source drive integrated circuit, a flexible film, a 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 view showing a pixel of the display area of FIG. 2 . 4 is a cross-sectional view taken along line I-I' of FIG. 3 .

Hereinafter, a transparent display device according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 . For convenience of explanation in FIGS. 1 to 4 , the X-axis direction is a direction parallel to the gate line, the Y-axis direction is a direction parallel to the data line, and the Z-axis direction is 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 , and a source drive integrated circuit (hereinafter referred to as “IC”) 130 . ), a flexible film 140 , a circuit board 150 , a timing control unit 160 , and a light control device 200 .

Although the transparent display device according to the embodiment of the present invention has been mainly described as being implemented as an organic light emitting display device, a liquid crystal display device and a quantum dot light emitting diode display device (Quantum dot Lighting Emitting Diode) have been described. ) or an electrophoresis display.

The transparent display panel 100 includes a lower substrate 111 and an upper substrate 112 . The upper substrate 112 may be an encapsulation substrate. The lower substrate 111 is formed to be larger than the upper substrate 112 , so that a portion of the lower substrate 111 may be exposed without being covered by the upper 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 P may be formed in areas where the gate lines and data lines cross each other. The pixels P of the display area DA may display an image.

Each of the pixels P of the display area DA includes a transmission area TA and an emission area EA as shown in FIGS. 3 and 4 . The light emitting area EA may include a plurality of light emitting units. The transparent display panel 100 can see an object or background located on the rear surface of the transparent display panel 100 due to the transparent areas TA, and can display an image due to the light emitting areas EA. . 3 and 4 illustrate that the light emitting area EA includes the red light emitting part RE, the green light emitting part GE, and the blue light emitting part BE, but is not limited thereto.

The transmission area TA is an area that substantially passes incident light. The light emitting area EA is an area that emits light, the red light emitting part RE is an area that emits red light, the green light emitting part GE is an area that emits green light, and the blue light emitting part BE emits blue light. area that emits light. The light emitting area EA corresponds to an opaque area in which incident light is blocked.

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 . can be

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

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 layer ILD provided on the source electrode SE and the drain electrode DE. . A barrier rib is provided between the anode electrodes AND adjacent to each other, so that the anode electrodes AND adjacent to each other may be electrically insulated.

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 barrier rib W. When a 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.

4 illustrates that the transparent display panel 100 is implemented 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 disposed on top of (112).

In the top emission method, since the light of the organic layer EL is emitted toward the upper substrate, the transistor T may be widely provided under the barrier rib W and the anode electrode 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 metal material having a high reflectance such as aluminum, a laminate structure of aluminum and ITO, and the cathode electrode CAT is formed of a transparent metal material such as ITO or IZO.

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 through which incident light substantially passes and a light emission area EA through which light is emitted. . As a result, according to the embodiment of the present invention, an object or 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 a gate control signal input from the timing controller 160 . 2 illustrates that the gate driver 120 is formed in a gate driver in panel (GIP) method on one side of the outer side of the display area DA of the transparent display panel 100 , but is not limited thereto. That is, the gate driver 120 may be formed in the GIP method on both sides of the display area DA of the transparent display panel 100 , or manufactured as a driving chip, mounted on a flexible film, and performed by tape automated bonding (TAB). In this way, it may be attached to the transparent display panel 100 .

The source drive IC 130 receives digital video data and a source control signal from the timing controller 160 . The source drive 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 lower substrate 111 is larger than that of the upper substrate 112 , a portion of the lower substrate 111 may be exposed without being covered by the upper substrate 112 . Pads such as data pads are provided on a portion of the lower substrate 111 that is not covered by the upper substrate 112 and is exposed. Wires connecting the pads and the source drive IC 130 and wires connecting the pads and the wires of the circuit board 150 may be formed on the flexible film 140 . The flexible film 140 is attached on the pads using an anisotropic conducting film, whereby the pads and the wirings of the flexible film 140 can be connected.

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

The timing controller 160 receives digital video data and a timing signal from an external system board (not shown). The timing controller 60 generates a gate control signal for controlling the operation timing of the gate driver 120 and a source control signal for controlling the source driver ICs 130 based on the timing signal III. The timing controller 60 supplies the gate control signal to the gate driver 120 and supplies the source control signal to the source drive ICs 30 .

The light control device 200 may block light incident in the light blocking mode and transmit light incident in the transmission mode. Hereinafter, the light control apparatus 200 will be described in more detail with reference to FIGS. 5 to 9 .

5 is a perspective view showing a light control device according to an embodiment of the present invention, and FIG. 6 is a plan view showing a light control device according to an embodiment of the present invention. 7 is a cross-sectional view taken along line II' of FIG. 6 , FIG. 8 is a cross-sectional view taken along line II-II' of FIG. 6 , and FIG. 9 is a cross-sectional view taken along line III-III' of FIG. 6 . 10 is a cross-sectional view showing a modified embodiment of the present invention.

5 to 9 , the light control device 200 includes a first substrate 210 , a second substrate 220 , and a light control layer 230 as shown in FIG. 5 .

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

The light control layer 230 is disposed between the first substrate 210 and the second substrate 220 and may be implemented in a transmission mode for transmitting incident light and a light blocking mode for blocking the incident light. In the embodiment of the present invention, it can be assumed that the light blocking mode represents a case where the light transmittance of the light control device 200 is less than α%, and the transmission mode represents a case where the light transmittance of the light control device 200 is β% or more. . The light transmittance of the light control device 200 represents a ratio of light incident to the light control device 200 to light output.

Specifically, as shown in FIGS. 6 to 9 , the light control layer 230 includes a first barrier rib 242 , a second barrier rib 244 , a first electrode 252 , a second electrode 254 , and a light control layer. cell 260 .

The first and second barrier ribs 242 and 244 are disposed between the first and second substrates 210 and 220 to maintain a gap of the light control cell 260 . A plurality of first and second barrier ribs 242 and 244 may be formed to partition the light control cell 260 . In this case, the first partition wall 242 and the second partition wall 244 may be alternately disposed and may be spaced apart from each other by a predetermined interval.

The first partition wall 242 and the second partition wall 244 may be formed of a transparent material. In this case, the barrier ribs 252 may be formed of any one of a photo resist, a photocurable polymer, and polydimethylsiloxane, but is not limited thereto.

Alternatively, the first barrier rib 242 and the second barrier rib 244 may include a material capable of absorbing light. For example, each of the first partition wall 242 and the second partition wall 244 may be implemented as a black partition wall.

Alternatively, the barrier ribs 252 may include scattering particles capable of scattering light. The scattering particles may be beads or silica balls.

Meanwhile, the first partition wall 242 and the second partition wall 244 do not actively pass light or block light. That is, when the first and second barrier ribs 242 and 244 are formed of a transparent material, they only pass light, and do not function to block light. In addition, when the first and second barrier ribs 242 and 244 include a material that absorbs light or a material that scatters light, they only scatter or block light, and do not allow light to pass therethrough. Accordingly, when the first and second barrier ribs 242 and 244 are formed in an area corresponding to the transmissive area TA of the transparent display device, the first and second barrier ribs 242 and 244 in the light blocking mode Accordingly, there is a problem in that light leakage is generated and the light transmittance is increased, or the light transmittance is lowered by blocking the light by the first and second barrier ribs 242 and 244 in the transmission mode.

For this reason, it is preferable that the first barrier rib 242 and the second barrier rib 244 correspond to the light emitting areas EA of the transparent display panel 100 . The first partition wall 242 and the second partition wall 244 may be disposed in a stripe shape, but are not limited thereto as long as they correspond only to the light emitting area EA. In this case, the width W2 of each of the first and second barrier ribs 242 and 244 is preferably smaller than the width W1 of the light emitting area EA.

The first electrode 252 is formed on the first partition wall 242 . Specifically, the first electrode 252 is formed on a side surface of the first barrier rib 242 facing the second barrier rib 244 and an upper surface of the first barrier rib 242 facing the second substrate 220 . The second electrode 254 is formed on the second barrier rib 244 . Specifically, the second electrode 254 is formed on a side surface of the second barrier rib 244 facing the first barrier rib 242 and an upper surface of the second barrier rib 244 facing the second substrate 220 .

Since the first electrode 252 and the second electrode 254 are formed in plurality, and the first and second barrier ribs 242 and 244 are alternately formed, the first electrode 252 and the second electrode ( 254) are also formed alternately.

6 illustrates that the first electrode 252 is formed on the side and upper surfaces of the first barrier rib 242 and the second electrode 254 is formed on the side and upper surfaces of the second barrier rib 244 , but this not limited In another embodiment, the first electrode 252 is formed only on the side of the first partition wall 242 facing the second partition wall 244 as shown in FIG. 10 , and the second electrode 254 is formed on the first partition wall 242 . ) and may be formed only on the side surface of the second partition wall 244 facing each other.

However, in one embodiment of the present invention, the first electrode 252 is formed on the top surface as well as the side surface of the first partition wall 242 , so that the first electrode 252, which is an opaque electrode, forms the upper surface of the first partition wall 242 . It is possible to effectively block the incident light. According to an embodiment of the present invention, the second electrode 254 is formed on the upper surface as well as the side surface of the second barrier rib 244 , so that the second electrode 254, which is an opaque electrode, is incident on the upper surface of the second barrier rib 244 . It can effectively block out the light.

In addition, in one embodiment of the present invention, compared with other embodiments, the formation area of the first electrode 252 and the second electrode 254 is increased to increase the resistance of the first electrode 252 and the second electrode 254 . can be reduced Accordingly, an embodiment of the present invention can more effectively reduce the time it takes to change from the transmissive mode to the light blocking mode or the time it takes to change from the light blocking mode to the transmissive mode, that is, the response time.

The first electrode 252 and the second electrode 254 may be opaque electrodes having a relatively low resistance per unit area compared to a transparent electrode. The opaque electrode may be copper (Cu) or aluminum (Al), but is not limited thereto. Since the first electrode 252 and the second electrode 254 are disposed on the first and second partition walls 242 and 244 , like the first and second partition walls 242 and 244 , the transparent display panel ( 100) to correspond to the light emitting areas EA. As described above, since the first electrode 252 and the second electrode 254 are provided to correspond to the light emitting area EA of the transparent display panel 100 , there is no transmittance loss in the transmissive mode even when formed as an opaque electrode.

As described above, the first electrode 252 and the second electrode 254 may be formed of an opaque electrode, but is not limited thereto. In another embodiment, the first electrode 252 and the second electrode 254 may be transparent electrodes. The transparent electrode is made of silver 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 It may be doped tin oxide (eg, Aluminum Tin Oxide, TAO) or antimony tin oxide (eg, Antimony Tin Oxide, ATO), but is not limited thereto.

Meanwhile, different voltages may be applied to the first electrode 252 and the second electrode 254 . For example, a negative voltage may be applied to the first electrode 252 and a positive voltage may be applied to the second electrode 254 . Conversely, a positive voltage may be applied to the first electrode 252 and a negative voltage may be applied to the second electrode 254 . Accordingly, when a voltage is applied to the first electrode 252 and the second electrode 254 , the electric field direction between the first electrode 252 and the second electrode 254 is formed perpendicular to the direction in which light passes. can be

Since the size of the first substrate 210 is larger than that of the second substrate 220 , a portion of the first substrate 210 may be exposed without being covered by the second substrate 220 . Each of the first electrodes 252 formed on each of the plurality of first barrier ribs 242 is not covered by the second substrate 220 in order to connect to the flexible film (not shown) but is exposed to the first substrate 210 . may be extended to some of the First wires connecting the first electrodes 252 and wires of the circuit board (not shown) may be formed on the flexible film (not shown). A flexible film (not shown) is attached on the first electrodes 252 using an anisotropic conducting film, whereby the first electrodes 252 and the first wiring of the flexible film (not shown) can be connected

In addition, each of the second electrodes 254 formed on each of the plurality of second barrier ribs 244 is not covered by the second substrate 220 and exposed to the first substrate ( 210) may be extended. Second wires connecting the second electrodes 254 and wires of the circuit board (not shown) may be formed on the flexible film (not shown). A flexible film (not shown) is attached on the second electrodes 254 using an anisotropic conducting film, whereby the second wiring of the second electrodes 254 and the flexible film (not shown) can be connected

In this case, the first wiring and the second wiring of the flexible film (not shown) may be formed on different layers. The first wiring of the flexible film includes wiring connecting the first electrodes 252 to each other. The second wiring of the flexible film includes wiring connecting the second electrodes 254 to each other. Since the first electrodes 252 and the second electrodes 254 are alternately disposed on the first substrate 210 , the first and second wires cross each other. Since different voltages should be applied to the first electrode 252 and the second electrode 254, they should not be electrically connected. Accordingly, in the flexible film, the first wiring and the second wiring may be formed on different layers, and an insulating layer may be formed between the first wiring and the second wiring.

The light transmittance of the light control cell 260 varies according to the voltage applied to the first electrode 252 and the second electrode 254 . For example, when no voltage is applied to the first electrode 252 and the second electrode 254 , the light control cell 260 may have a light transmittance of β% or more, thus implementing a transmission mode. When a voltage is applied to the first electrode 252 and the second electrode 254 , the light transmittance of the light control cell 260 may be lower than α%, and thus a light blocking mode may be implemented.

The light control cell 260 includes a light transmittance variable material that changes light transmittance according to a voltage applied to the first electrode 252 and the second electrode 254 .

In the light transmittance variable material according to an embodiment of the present invention, an electrochemical redox reaction occurs when a voltage is applied to the first electrode 252 and the second electrode 254, thereby including an electrochromic material that changes color. can

For example, when a voltage is applied to the first electrode 252 and the second electrode 254 , a reduction reaction occurs in the electrochromic material, and the electrochromic material changes to a predetermined color such as black or blue by the reduction reaction. Accordingly, the light control apparatus 200 may implement a light blocking mode that blocks incident light.

In addition, when no voltage is applied to the first electrode 252 and the second electrode 254 , an oxidation reaction occurs in the electrochromic material, and the electrochromic material becomes transparent by the oxidation reaction. Accordingly, the light control apparatus 200 may implement a transmission mode in which incident light is transmitted as it is.

Such an electrochromic material may have a predetermined color by absorbing a predetermined color when a reduction reaction occurs, and may be a material that becomes transparent when an oxidation reaction occurs. For example, the electrochromic material is 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 light transmittance variable material according to an embodiment of the present invention may further include a counter material that assists the electrochromic material to smoothly perform an oxidation-reduction reaction. In this case, 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 the electrochromic material, and takes on a predetermined color by absorbing a predetermined color by the oxidation reaction. When an oxidation reaction occurs in the electrochromic material, the counter material undergoes a reduction reaction opposite to 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 light transmittance variable 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 the liquid or gel of the same layer. The electrolyte provides positive and negative ions 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 the liquid or gel of the same layer.

In the light control apparatus 200 according to an exemplary embodiment of the present invention, the first electrode 252 and the second electrode 254 are formed to correspond to the light emitting area EA, so that the first electrode 252 and the second electrode are formed. It is possible to prevent loss of light transmittance by 254 .

In addition, in the light control device 200 according to an embodiment of the present invention, since the first electrode 252 and the second electrode 254 are not formed in the transmission area TA, the first electrode 252 and the second electrode 252 Compared to the electrode 254 as a transparent electrode, an opaque electrode having a low sheet resistance may be used. Accordingly, the light control device 200 can reduce the time it takes for the electrochromic material to discolor, thereby reducing the time it takes to change from the transmissive mode to the light-shielding mode or the time it takes to change the light-shielding mode to the transmissive mode. In addition, the light control device 200 may prevent yellowing caused by the transparent electrode from occurring.

11 is a cross-sectional view showing a light control device according to another modified embodiment of the present invention.

The light control device 200 shown in FIG. 11 is different from the light control device 200 shown in FIG. 6 in that the light control layer 230 includes a liquid crystal material. Hereinafter, detailed information about the same configuration as that of FIG. 6 will be omitted.

The light control device 200 according to another modified embodiment of the present invention includes a first substrate 210 , a second substrate 220 , a light control layer 230 , a first alignment layer 282 , and a second alignment layer 284 . ) is included. Each of the first and second substrates 210 and 220 may be a glass substrate or a plastic film.

The light control layer 230 is disposed between the first substrate 210 and the second substrate 220 and may be implemented in a transmission mode for transmitting incident light and a light blocking mode for blocking the incident light. Specifically, the light control layer 230 includes a first barrier rib 242 , a second barrier rib 244 , a first electrode 252 , a second electrode 254 , and a light control cell 260 .

The first and second barrier ribs 242 and 244 are disposed between the first and second substrates 210 and 220 to maintain a gap of the light control cell 260 . A plurality of first and second barrier ribs 242 and 244 may be formed to partition the light control cell 260 . In this case, the first partition wall 242 and the second partition wall 244 may be alternately disposed and may be spaced apart from each other by a predetermined interval.

The first partition wall 242 and the second partition wall 244 are preferably disposed to correspond to the emission areas EA of the transparent display panel 100 . The first partition wall 242 and the second partition wall 244 may be disposed in a stripe shape, but are not limited thereto as long as they correspond only to the light emitting area EA. In this case, the width W2 of each of the first and second barrier ribs 242 and 244 is preferably smaller than the width W1 of the light emitting area EA.

The first electrode 252 is formed on the first partition wall 242 . Specifically, the first electrode 252 is formed on a side surface of the first barrier rib 242 facing the second barrier rib 244 and an upper surface of the first barrier rib 242 facing the second substrate 220 .

The second electrode 254 is formed on the second barrier rib 244 . Specifically, the second electrode 254 is formed on a side surface of the second barrier rib 244 facing the first barrier rib 242 and an upper surface of the second barrier rib 244 facing the second substrate 220 .

The first electrode 252 and the second electrode 254 may be opaque electrodes having a relatively low resistance per unit area compared to a transparent electrode. Since the first electrode 252 and the second electrode 254 are provided to correspond to the light emitting area EA of the transparent display panel 100 , there is no transmittance loss in the transmissive mode even though the first electrode 252 and the second electrode 254 are formed as opaque electrodes.

As described above, the first electrode 252 and the second electrode 254 may be formed of an opaque electrode, but is not limited thereto. In another embodiment, the first electrode 252 and the second electrode 254 may be transparent electrodes.

Meanwhile, different voltages may be applied to the first electrode 252 and the second electrode 254 . For example, a negative voltage may be applied to the first electrode 252 and a positive voltage may be applied to the second electrode 254 . Conversely, a positive voltage may be applied to the first electrode 252 and a negative voltage may be applied to the second electrode 254 .

The light transmittance of the light control cell 260 varies according to the voltage applied to the first electrode 252 and the second electrode 254 . For example, when no voltage is applied to the first electrode 252 and the second electrode 254 , the light control cell 260 may have a light transmittance of β% or more, thus implementing a transmission mode. When a voltage is applied to the first electrode 252 and the second electrode 254 , the light transmittance of the light control cell 260 may be lower than α%, and thus a light blocking mode may be implemented.

The light control cell 260 includes a light transmittance variable material that changes light transmittance according to a voltage applied to the first electrode 252 and the second electrode 254 .

The light transmittance variable material according to another embodiment of the present invention may include liquid crystals 261 , dichroic dyes 262 , and ionic materials 263 . The variable light transmittance material according to another embodiment of the present invention implements a transmission mode in which incident light is transmitted when no voltage is applied to the first and second electrodes 252 and 254, and the first and second electrodes 252 and 252 , 254) may implement a light blocking mode that blocks incident light when a voltage is applied.

More specifically, the long-axis direction of the liquid crystals 261 is a vertical direction (Z-axis direction) by the first and second alignment layers 282 and 284 even when no voltage is applied to the first and second electrodes 252 and 254 . ) may be positively polarized liquid crystals arranged in The long axis direction of the dichroic dyes 262 is also vertical by the first and second alignment layers 282 and 284 even when no voltage is applied to the first and second electrodes 252 and 254 like the liquid crystals 261 . (Z-axis direction) can be arranged. Accordingly, the light control device 200 may operate in the transmission mode even when no voltage is applied.

The dichroic dyes 262 may be light-absorbing dyes. For example, the dichroic dyes 262 absorb light other than a wavelength band of a black dye or a specific color (eg, red) and absorb all light of a visible wavelength band and a specific color (eg, red). ) may be a dye that reflects light in the wavelength band. Although the exemplary embodiment of the present invention has been mainly described that the dichroic dyes 262 are black dyes, the present invention is not limited thereto. For example, the dichroic dyes 262 may be dyes having any one color of red, green, blue, and yellow or a color composed of a mixture thereof. there is. That is, in the embodiment of the present invention, the background can be blocked while expressing various colors in the light blocking mode. For this reason, since the embodiment of the present invention can provide various colors in the light blocking mode, the user can feel the aesthetic feeling. 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 a public window requiring a transmission mode and a light blocking mode, various colors are expressed according to time or place. You can shade it while doing it.

The ionic materials 263 serve to allow the liquid crystals 261 and the dichroic dye 262 to move randomly. The ionic materials 263 may have a predetermined polarity, so that the first electrode 252 or the second electrode 254 may have a polarity depending on the polarity of the voltage applied to the first electrode 252 and the second electrode 254 . can move to For example, when the ionic materials 263 have a negative polarity, when a positive voltage is applied to the first electrode 252 and a negative voltage is applied to the second electrode 254 , the ionic materials 263 are first It moves to the first electrode 252 . In addition, when the ionic material 263 has a negative polarity, a positive voltage is applied to the second electrode 254 and a negative voltage is applied to the first electrode 252 , the ionic material 263 is the second electrode Go to (254). In addition, when the ionic material 263 has a positive polarity, when a positive voltage is applied to the first electrode 252 and a negative voltage is applied to the second electrode 254 , the ionic material 263 is the second electrode Go to (254). In addition, when the ionic material 263 has a positive polarity, when a positive voltage is applied to the second electrode 254 and a negative voltage is applied to the first electrode 252 , the ionic material 263 is the first electrode Go to (252). Therefore, when a voltage is applied to the first and second electrodes 252 and 254 , the ionic materials 263 go from the first electrode 252 to the second electrode 254 at a predetermined period and then go back to the first electrode 252 . ) to repeat the return movement. In this case, as the ionic materials 263 move and collide with the liquid crystals 261 and the dichroic dyes 262 , the liquid crystals 261 and the dichroic dyes 262 move randomly. In this case, since light incident to the light control cell 260 may be scattered by the liquid crystals 261 moving randomly or absorbed by the dichroic dyes 262 , a light blocking mode may be implemented.

The first alignment layer 282 is provided on one surface of the first substrate 210 facing the second substrate 220 . The second alignment layer 284 is provided on one surface of the second substrate 220 facing the first substrate 210 . The first and second alignment layers 282 and 284 align the long axes of the liquid crystals 261 and the dichroic dye 262 in the vertical direction (Z) when no voltage is applied to the first and second electrodes 252 and 254 . vertical alignment layers to be arranged in the axial direction).

12 is a flowchart illustrating a method of manufacturing a light control device according to an embodiment of the present invention. 13A to 13D are cross-sectional views for explaining a method of manufacturing 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 with reference to FIGS. 12 and 13A to 13D .

First, as shown in FIG. 13A , first barrier ribs 252 and second barrier ribs 254 are formed on one surface of the first substrate 210 facing the second substrate 220 ( S1201 ). ).

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

The first partition walls 252 and the second partition walls 254 may be formed by an imprinting method or a photo lithography method.

When the first partition walls 252 and the second partition walls 254 are formed by the imprinting method, a material for forming the first partition walls 252 and the second partition walls 254 is formed to face the second substrate 220 . The beams may be coated on one surface of the first substrate 210 and then pressed with a mold made of silicon, quartz, or a polymer material to form the first partition walls 252 and the second partition walls 254 . . In the mold, patterns of the first and second partitions 252 and 254 in which the height and width of the first and second partitions 252 and 254 are designed are formed. For example, the height of the first partition walls 252 and the second partition walls 254 may be approximately 50 μm to 500 μm. In addition, the first partition walls 252 and the second partition walls 254 are disposed to correspond to the light emitting areas EA of the transparent display panel 100 , and the first partition walls 252 and the second partition walls 254 are disposed. The width of the light emitting areas EA is preferably formed to be less than or equal to the width of the light emitting areas EA.

When the first and second barrier ribs 252 and 254 are formed by a photo lithography method, a material for forming the first and second barrier ribs 252 and 254 is formed on the second substrate ( The first barrier ribs 252 and the second barrier ribs 254 may be formed by coating on one surface of the first substrate 210 facing the 220 and exposing it using a photo process.

When the first barrier ribs 252 and the second barrier ribs 254 are formed of a transparent material, they may be formed of any one of a photo resist, a photocurable polymer, and polydimethylsiloxane. Alternatively, the first partition walls 252 and the second partition walls 254 may include a material capable of absorbing light. For example, each of the barrier ribs 252 may be implemented as a black barrier rib. Alternatively, the first partition walls 252 and the second partition walls 254 may include scattering particles capable of scattering light. The scattering particles may be beads or silica balls.

Second, as shown in FIG. 13B , the first electrode 252 is patterned on the first barrier ribs 242 , and the second electrode 254 is patterned on the second barrier rib 244 to form it. (S1202).

Specifically, the first electrode 252 is formed by patterning the side surface of the first barrier rib 242 facing the second barrier rib 244 and the upper surface of the first barrier rib 242 facing the second substrate 220 , , formed by patterning the second electrode 254 on the side surface of the second barrier rib 244 facing the first barrier rib 242 and the upper surface of the second barrier rib 244 facing the second substrate 220 .

The first electrode 252 and the second electrode 254 may be opaque electrodes having a relatively low resistance per unit area compared to the transparent electrode, and the opaque electrode may be copper (Cu) or aluminum (Al). However, the present invention is not limited thereto.

The first electrode 252 and the second electrode 254 may be formed of an opaque electrode, but is not limited thereto. In another embodiment, the first electrode 252 and the second electrode 254 may be transparent electrodes. The transparent electrode is made of silver 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 It may be doped tin oxide (eg, Aluminum Tin Oxide, TAO) or antimony tin oxide (eg, Antimony Tin Oxide, ATO), but is not limited thereto.

The first electrode 252 and the second electrode 254 may be formed by a photo lithography method. A material for forming the first electrode 252 and the second electrode 254 is coated on one surface of the first substrate 210 facing the second substrate 220 and then exposed using a photo process, whereby the first An electrode 252 and a second electrode 254 may be formed.

Alternatively, the first electrode 252 and the second electrode 254 may be formed by a chemical vapor deposition (CVD) process, plasma enhanced chemical vapor deposition (PECVD) using a fine metal mask (FMM). Process, high density plasma-chemical vapor deposition (HDP-CVD) process, thermal deposition process, vacuum deposition process, spin coating process, sputtering process, atomic layer deposition (Atomic) process It may be formed through at least one of a Layer Deposition: ALD process or a printing process.

Third, as shown in FIG. 13C , a light transmittance variable material is injected between the first partition wall 242 on which the first electrode 252 is formed and the second partition wall 244 on which the second electrode 254 is formed ( S1203 ). . The process of filling the light transmittance variable material between the first partition wall 242 on which the first electrode 252 is formed and the second partition wall 244 on which the second electrode 254 is formed may be performed by an inkjet method.

The light transmittance variable material may include an electrochromic material dissolved in a liquid or gel. The light transmittance variable material may further include at least one of a counter material and an electrolyte.

Fourth, as shown in FIG. 13D , the first substrate 210 on which the light control layer 230 is formed and the second substrate 220 are bonded ( S1204 ).

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 various modifications may be made within the scope without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: display panel 111: lower substrate
112: upper substrate 120: gate driver
130: source drive IC 140: flexible film
150: circuit board 160: timing control unit
200: light control device 210: first substrate
220: second substrate 230: light control layer
242: first partition 244: second partition
252: first electrode 254: second electrode
260: light control cell 261: liquid crystal
262: dichroic dye 263: ionic substance
270: adhesive layer 282: first alignment layer
284: second alignment layer

Claims (23)

a first substrate and a second substrate facing each other;
first and second barrier ribs disposed between the first and second substrates to maintain a gap between the first and second substrates;
a first electrode disposed on a side surface of the first barrier rib facing the second barrier rib;
a second electrode disposed on a side surface of the second barrier rib facing the first barrier rib; and
It is disposed between the first electrode and the second electrode, and includes a light transmittance variable material for changing light transmittance according to a voltage applied to the first electrode and the second electrode,
and the first electrode and the second electrode are disposed to correspond to the light emitting area of the transparent display panel, and are spaced apart from each other with an area overlapping the transmissive area of the transparent display panel therebetween. light control. The method of claim 1,
The light control apparatus according to claim 1, wherein the first and second barrier ribs are plural, and the first and second barrier ribs are alternately arranged. 3. The method of claim 2,
wherein the first electrode is disposed on a side surface of the first partition wall facing adjacent second partition walls, and the second electrode is disposed on a side surface of the second partition wall facing the adjacent first partition walls control, 4. The method of claim 3,
wherein the first electrode is further disposed on an upper surface of the first barrier rib to cover the first barrier rib, and the second electrode is further disposed on an upper surface of the second barrier rib to cover the second barrier rib . According to claim 1,
The light transmittance variable material comprises an electrochromic material that is electrochromic when a voltage is applied to the first electrode and the second electrode. 6. The method of claim 5,
The light transmittance variable material further includes a counter material that undergoes an oxidation reaction when the electrochromic material undergoes a reduction reaction, and performs a reduction reaction when the electrochromic material undergoes an oxidation reaction,
The light control device, characterized in that the electrochromic material and the counter material are dissolved in a liquid or gel (gel) of the same layer. 6. The method of claim 5,
The light transmittance variable material further comprises an electrolyte,
The electrochromic material and the electrolyte are light control device, characterized in that dissolved in the same layer of liquid or gel (gel). According to claim 1, wherein the light transmittance variable material,
A light control device comprising liquid crystals, dichroic dyes and ionic substances. 9. The method of claim 8,
a first alignment layer disposed on one surface of the first substrate facing the second substrate; and
and a second alignment layer disposed on one surface of the second substrate facing the first substrate. 10. The method of claim 9,
When a voltage is not applied to the first electrode and the second electrode by the first and second alignment layers, the long axes of the liquid crystals and the dichroic dye are arranged in a vertical direction. According to claim 1,
and the first and second electrodes are opaque electrodes. The method of claim 1,
The light control device according to claim 1, wherein different voltages are applied to the first electrode and the second electrode. A transparent display panel comprising: a transparent display panel including transmissive regions for transmitting incident light and light emitting regions for emitting light; and
and a light control device disposed on one surface of the transparent display panel and capable of a transmission mode for transmitting incident light and a light blocking mode for blocking incident light;
The light control device,
a first substrate and a second substrate facing each other;
a plurality of first barrier ribs disposed between the first substrate and the second substrate to maintain a gap between the first substrate and the second substrate;
a plurality of second barrier ribs alternately disposed with the first barrier ribs between the first and second substrates and maintaining a gap between the first and second substrates;
a first electrode disposed on a side surface of the first barrier rib facing adjacent second barrier ribs;
a second electrode disposed on a side surface of the second barrier rib facing adjacent first barrier ribs; and
and a light transmittance variable material disposed between the first electrode and the second electrode, the light transmittance varying according to a voltage applied to the first electrode and the second electrode;
The transparent display device of claim 1, wherein the first electrode and the second electrode are disposed to correspond to the emission area and spaced apart from each other with an area overlapping the transmission area therebetween. 14. The method of claim 13,
The first electrode is further disposed on an upper surface of the first barrier rib to cover the first barrier rib, and the second electrode is further disposed on an upper surface of the second barrier rib to cover the second barrier rib. . 14. The method of claim 13,
The transparent display device, wherein different voltages are applied to the first electrode and the second electrode. delete 14. The method of claim 13,
The first barrier rib and the second barrier rib have a width smaller than that of the light emitting area. 14. The method of claim 13,
and the light transmittance variable material includes an electrochromic material that changes color when a voltage is applied to the first electrode and the second electrode. 19. The method of claim 18,
The light transmittance variable material further includes a counter material that undergoes an oxidation reaction when the electrochromic material undergoes a reduction reaction, and performs a reduction reaction when the electrochromic material undergoes an oxidation reaction,
The transparent display device, wherein the electrochromic material and the counter material are dissolved in a liquid or gel of the same layer. 19. The method of claim 18,
The light transmittance variable material further comprises an electrolyte,
The electrochromic material and the electrolyte are a transparent display device, characterized in that dissolved in a liquid or gel (gel) of the same layer. The method of claim 13, wherein the light transmittance variable material,
A transparent display device comprising liquid crystals, dichroic dyes and ionic substances. The method of claim 21, wherein the light control device,
a first alignment layer disposed on one surface of the first substrate facing the second substrate; and
The transparent display device of claim 1, further comprising a second alignment layer disposed on one surface of the second substrate facing the first substrate. 14. The method of claim 13,
The first and second electrodes are opaque electrodes.

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