KR102495945B1 - Light controlling device, and transparent display device including the same - Google Patents

Abstract

The present invention provides a light control device capable of preventing a short circuit between a first electrode and a second electrode when a second base film is bent in the direction of one side of the light control device, and a transparent display device including the same. do.
A light control device according to an embodiment of the present invention includes a first base film having a first protrusion, a second base film having a second protrusion, and a liquid crystal layer disposed between the first and second base films. , The first protrusion is not covered by the second base film, and the second protrusion is not covered by the first base film.

Description

Light control device and transparent display device including the same {LIGHT CONTROLLING DEVICE, AND TRANSPARENT DISPLAY DEVICE INCLUDING THE SAME}

Embodiments of the present invention relate to a light control device and 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 has been actively researched. 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 a 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 needed to prevent the bright-room contrast ratio from deteriorating.

The light control device may include a first base film, a second base film, a liquid crystal layer disposed between the first base film and the second base film, and barrier ribs for maintaining a constant gap between the liquid crystal layers. . At one side of the light control device, a control driving unit for controlling the transmission mode and the light blocking mode of the light control device is provided. The driving unit for control includes a flexible film for control and a circuit board for control. The flexible film for control is attached to each side of the first base film and the second base film, and the circuit board for control is connected to the flexible film for control. The driving unit for control extends from the side of the light control device and is disposed on one side of the light control device in order to reduce the bezel area of the transparent display device. In this case, the flexible second base film may be bent in the direction of one side of the light control device along the driving unit for control. This may cause a short circuit between the second electrode provided on the second base film and the first electrode provided on the first base film. When the first electrode and the second electrode are short-circuited, normal driving of the light control device is difficult.

The present invention relates to a light control device capable of preventing a short circuit between a first electrode and a second electrode when a second base film is bent in a direction of one side of the light control device, and a transparent display including the same. provide the device.

A light control device according to an embodiment of the present invention includes a first base film having a first protrusion, a second base film having a second protrusion, and a liquid crystal layer disposed between the first and second base films. , The first protrusion is not covered by the second base film, and the second protrusion is not covered by the first base film.

A transparent display device according to an embodiment of the present invention includes a transparent display panel that transmits light and displays an image, and a light control device disposed on at least one surface of the transparent display panel. The light control device includes a first base film having a first protrusion, a second base film having a second protrusion, and a liquid crystal layer disposed between the first and second base films, the first protrusion being It is not covered by the second base film, and the second protrusion is not covered by the first base film.

According to the means for solving the above problems, in the transparent display device according to the present invention, since one side of the lower plate facing the second protrusion protrudes more than the first base film, the second protrusion and the second flexible circuit board are formed on the lower plate. Contact between the first base film and the second base film may be prevented when bending in one side direction. Accordingly, it is possible to prevent a short circuit between the first electrode on the first base film and the second electrode on the second base film facing each other, so that the light control device can be normally driven.

In addition, since the spacer is provided between the first base film and the second base film in the transparent display device according to the exemplary embodiment of the present invention, when the second protrusion and the second flexible circuit board are bent toward one side of the lower plate. It is possible to prevent contact between the first base film and the second base film. As a result, the first electrode on the first base film and the second electrode on the second base film facing each other can be prevented from being shorted, and the light control device can be normally driven.

In addition to the effects of the present invention mentioned above, other features and advantages of the present invention will be described below, or will be clearly understood by those skilled in the art from such description and 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 IC, a flexible film, a display circuit board, and a timing controller of a transparent display device according to an embodiment of the present invention;
3 is an exemplary view showing pixels of the display area of FIG. 2;
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;
6 is a cross-sectional view showing a cross-section of one side of a light control device according to an embodiment of the present invention.
7 is a cross-sectional view showing a cross section of region A of FIG. 5;
8 and 9 are cross-sectional views showing one side of the transparent display device according to the first embodiment of the present invention.
10 is a cross-sectional view of one side of a transparent display device according to a second exemplary embodiment of the present invention.
11 is a cross-sectional view of one side of a transparent display device according to a third exemplary embodiment of the present invention.

The meaning of terms described in this specification should be understood as follows.

Singular expressions should be understood to include plural expressions unless the context clearly defines otherwise, and terms such as “first” and “second” are used to distinguish one component from another, The scope of rights should not be limited by these terms. It should be understood that terms such as "comprise" or "having" do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. 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 each of the first item, the second item, and the third item, but also two of the first item, the second item, and the third item. It means a combination of all items that can be presented from one or more. The term "on" is meant to include not only a case in which a component is formed directly on top of another component, but also a case in which a third component is interposed between these components.

Hereinafter, preferred examples of a light control device according to the present invention, a transparent display device including the same, and a manufacturing method thereof will be described in detail with reference to the accompanying drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

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 mainly as being implemented as an organic light emitting display (OLED), but may also be implemented as a liquid crystal display (LCD) or an electrophoresis display (ELD). can

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 .

Gate lines and data lines may be formed in the display area DA of the transparent display panel 100 , and light emitting units may be formed in intersection areas of the gate lines and data lines. The light emitting units of 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 formed 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 W is provided between adjacent anode electrodes AND, so that the adjacent anode electrodes AND may 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 W. 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. In the top emission method, since light from the organic layer EL is emitted toward the upper substrate, the transistor T can be widely provided under the bank W 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 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 drive ICs 130 based on the timing signal. The timing controller 60 supplies a gate control signal to the gate driver 120 and supplies a source control signal to the source drive ICs 30 .

The light control device 200 may block incident light in a light blocking mode and transmit incident light in a transmission mode. In the embodiment of the present invention, the light control device 200 implements a light blocking mode and a transmission mode using a liquid crystal layer to which a dynamic scattering mode is applied, but is not limited thereto, and a PDLC layer (polymer dispersed liquid The light blocking mode and the transmission mode may be implemented using a crystals layer) or a polymer network liquid crystals layer (PNLC). A detailed description of the light control device 200 according to the embodiment of the present invention will be described later in conjunction with FIGS. 5 to 7 .

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 .

The lower plate 400 is disposed on one side of the light control device 200 . The lower plate 400 protects the light control device 200 . For example, the lower plate 400 may be a transparent tempered glass substrate or a transparent plastic substrate, but is not necessarily limited thereto.

5 is a plan view showing a light control device according to an embodiment of the present invention. 6 is a cross-sectional view showing a cross-section of one side of a light control device according to an embodiment of the present invention. FIG. 7 is a cross-sectional view showing a cross section of area A of FIG. 5 . Hereinafter, a light control device according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 7 .

5 to 7 , the light control device 200 according to an embodiment of the present invention includes a light control area LCA and an adhesive member SL. 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 . The adhesive member SL serves to adhere the first and second base films 210 and 220 . The adhesive member SL is disposed on the edges of the first and second base films 210 and 220 .

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 liquid crystal layer 250, a first flexible circuit board ( 260), a second flexible circuit board 270, and a voltage supply unit 280.

The first base film 210 is disposed to face the second base film 220 . A first protrusion 211 is provided on one side of the first base film 210 . The first protrusion 211 is a portion that protrudes more than the second base film 220 disposed to face the first base film 210 . The first protrusion 211 is not covered by the second base film 220 . First pads 213 connected to the first electrode 230 are provided on the upper surface of the first protrusion 211 . The first pads 213 are electrically connected to the first flexible circuit board 260 and transfer the driving voltage applied from the voltage supply unit 280 to the first electrode 230 . The first pads 213 may be simultaneously prepared using the same process as the first electrode 230 and may be made of the same material.

The second base film 220 is disposed to face the first base film 210 . A second protrusion 221 is provided on one side of the second base film 220 . The second protrusion 221 is a portion that protrudes more than the first base film 210 disposed to face the second base film 220 . The second protrusion 221 is not covered by the first base film 210 . Under the second protrusion 221 , second pads 223 connected to the second electrode 240 are provided. The second pads 223 are electrically connected to the second flexible circuit board 270 and transfer the common voltage applied from the voltage supply unit 280 to the second electrode 240 . The second pads 223 may be simultaneously prepared using the same process as the second electrode 240 and may be made of the same material.

The first base film 210 and the second base film 220 may be plastic films. 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.

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 213 and the second electrode 240 is connected to the second pads 223 . 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.

The liquid crystal layer 250 is provided between the first base film 210 and the second base film 220 . The liquid crystal layer 250 is provided between the first electrode 230 and the second electrode 240 . The liquid crystal layer 250 may be a dynamic scattering mode liquid cyrstal layer including liquid crystals, dichroic dyes, and ionic materials. In the case of the dynamic scattering mode, when a voltage is applied to the first and second electrodes 230 and 240, liquid crystals and dichroic dyes are randomly moved by ionic materials. In this case, since light incident on the liquid crystal layer 250 may be scattered by randomly moving liquid crystals or absorbed by dichroic dyes, a light blocking mode may be realized. Alternatively, the liquid crystal layer 250 may be a guest host liquid crystal layer including liquid crystals and dichroic dyes. In this case, the liquid crystals may be host materials and the dichroic dyes may be guest materials. Alternatively, the liquid crystal layer 250 may be a polymer network liquid crystal layer including liquid crystals, dichroic dyes, and a polymer network. In this case, the liquid crystal layer 250 may enhance the scattering effect of incident light due to the polymer network. When the polymer network is included, the light blocking rate may be higher than when the light is blocked without the polymer network. 6 illustrates that the liquid crystal layer 250 is implemented as a dynamic scattering mode liquid crystal layer for convenience of description.

Specifically, the liquid crystal layer 250 may include liquid crystal cells 251 , barrier ribs 252 , a first alignment layer 253 , and a second alignment layer 254 . The liquid crystal cells 251 are provided between the first electrode 230 and the second electrode 240 . The liquid crystal cells 251 include liquid crystals 251a, dichroic dyes 251b, and ionic materials 251c. The long axis direction of the liquid crystals 251a is aligned in the vertical direction (Z-axis direction) by the first and second alignment layers 253 and 254 even if no voltage is applied to the first and second electrodes 230 and 240. It may be positive liquid crystals, but is not necessarily limited thereto. The long axis direction of the dichroic dyes 251b is also vertical by the first and second alignment layers 253 and 254 even though no voltage is applied to the first and second electrodes 230 and 240 like the liquid crystals 251a. (Z-axis direction). Therefore, since the light control device 200 can operate in a transmission mode even when no voltage is applied, there is an advantage in implementing a transmission mode without power consumption.

The dichroic dyes 251b may be dyes that absorb light. For example, the dichroic dyes 251b may be a black dye that absorbs all light in a visible ray wavelength range or a specific color (eg, red) that absorbs light other than a wavelength range and a specific color (eg, red). ) may be a dye that reflects light in the wavelength range. In the embodiment of the present invention, it has been mainly described that the dichroic dyes 251b are black dyes, but it is not limited thereto. For example, the dichroic dyes 251b may be dyes having a color of any one of red, green, blue, and yellow, or a mixture thereof. there is. 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 251c serve to randomly move liquid crystals and dichroic dyes. The ionic materials 251c may have a predetermined polarity, and thus, the first electrode 230 or the second electrode 240 may be formed according to polarities of voltages applied to the first electrode 230 and the second electrode 240. can move to For example, when the ionic materials 251c 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 251c have a negative polarity. 1 moves to the electrode 230. In addition, when the ionic materials 251c 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 251c are transferred to the second electrode 251c. Go to (240). In addition, when the ionic materials 251c 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 251c form a second polarity. moves to the electrode 240. In addition, when the ionic materials 251c 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 251c are transferred to the first electrode 251c. Go to (230). Therefore, when a voltage is applied to the first and second electrodes 230 and 240, the ionic materials 251c go from the first electrode 230 to the second electrode 240 at a predetermined cycle and then back to the first electrode ( 230) is repeated. In this case, since the ionic materials 251c collide with the liquid crystals 251a and the dichroic dyes 251b while moving, the liquid crystals 251a and the dichroic dyes 251b may move randomly. The voltage applied to the first and second electrodes 230 and 240 may be an AC voltage. Alternatively, since the ionic materials 251c change or distort the vertical electric field while moving, the liquid crystals 251a and the dichroic dyes 251b may move randomly due to the change or distortion of the vertical electric field.

Alternatively, the ionic materials 251c may exchange electrons with each other according to polarities of voltages applied to the first electrode 230 and the second electrode 240 . Therefore, when an AC voltage having a predetermined period is applied to the first and second electrodes 230 and 240, the ionic materials 251c exchange electrons at a predetermined period. In this case, since the electrons collide with the liquid crystals 251a and the dichroic dyes 251b while moving, the liquid crystals 251a and the dichroic dyes 251b move randomly. The voltage applied to the first and second electrodes 230 and 240 may be an AC voltage. Alternatively, since the electrons change or distort the vertical electric field while moving, the liquid crystals 251a and the dichroic dyes 251b may move randomly due to the change or distortion of the vertical electric field.

Since the liquid crystal cell 251 is in a liquid state, barrier ribs 252 are required to maintain a cell gap of the liquid crystal cell 251 . The barrier ribs 252 may be disposed on one surface of the first electrode 230 facing the second base film 220 . The barrier ribs 252 may be spaced apart at predetermined intervals, and the liquid crystal cell 251 may be partitioned by the barrier ribs 252 .

The barrier ribs 252 are for maintaining a cell gap of the liquid crystal layer 250 . Since the barrier ribs 252 are applied, the inside of the liquid crystal layer 250 can be protected when force is applied from the outside. The barrier ribs 252 may be formed of a transparent material. In this case, the barrier ribs 252 may be formed of any one of photo resist, photocurable polymer, and polydimethylsiloxane, but are not limited thereto.

Alternatively, the barrier ribs 252 may include a material capable of absorbing light. For example, each of the barrier ribs 252 may be implemented as a black barrier rib. In the embodiment of the present invention, since the barrier ribs 252 are provided to correspond to the light emitting area EA of the transparent display panel 100, even if each of the barrier ribs 252 is implemented as a black barrier rib, transmittance is hardly lost in the transmission mode. .

Alternatively, the barrier ribs 252 may include scattering particles capable of scattering light. The scattering particles may be beads or silica balls. In this case, the barrier ribs 252 may re-scatter light scattered by the liquid crystals 251a in the light-shielding mode, so that an optical path may be lengthened. Since the probability of light being absorbed by the dichroic dyes 251b increases when the optical path becomes longer, the light blocking rate in the light blocking mode may be increased.

Meanwhile, the barrier ribs 252 do not actively pass light or block light like the liquid crystal cells 251 do. That is, when the barrier ribs 252 are formed of a transparent material, they only pass light and do not block light. In addition, when the barrier ribs 252 include a material that absorbs light or a material that scatters light, they only scatter or block light and do not pass light. Therefore, when the barrier ribs 252 are formed in an area corresponding to the transmissive area TA of the transparent display device, light leakage occurs at the barrier ribs 252 in the light-shielding mode, resulting in increased light transmittance, or the barrier rib 252 in the transmissive mode ), there is a problem that light transmittance is lowered by blocking light. Accordingly, the barrier ribs 252 are disposed to correspond to the emission areas EA of the transparent display panel 100, and the liquid crystal cells 251 are disposed to correspond to the transmission areas TA of the transparent display panel 100. it is desirable The barrier ribs 252 may be disposed in a stripe shape, but are not limited thereto, and may be disposed in a cylindrical shape, a honeycomb shape, or a p (p is a positive integer of 3 or more) polygonal shape.

The first alignment layer 253 is provided on one surface of the first electrode 230 facing the second base film 220 and on the barrier ribs 252 . The second alignment layer 254 is provided on one surface of the second electrode 240 facing the first base film 210 . When voltage is not applied to the first and second electrodes 230 and 240, the first and second alignment layers 253 and 254 extend the long axes of the liquid crystals 251a and the dichroic dyes 251b in a vertical direction. (Z-axis direction) may be vertical alignment layers for arranging. For example, the first and second alignment layers 253 and 254 may be polyimide (PI).

The first flexible circuit board 260 is attached to the first pads 213 . The first flexible circuit board 260 includes a first circuit film 261 , a second circuit film 263 , driving voltage wires 265 , and connection wires 267 . Driving voltage wires 265 and connection wires 267 are provided on the lower surface of the first circuit film 261 . Each of the driving voltage lines 265 is attached to the first pads 213 and applies the driving voltage applied from the voltage supply unit 280 to the first electrode 230 . The connection wires 267 are provided on the lower surface of the first circuit film 261 so as not to overlap with the driving voltage wires 265 . Each of the connection wires 267 applies the common voltage applied from the voltage supply unit 280 to the second electrode 240 . To this end, the first flexible circuit board 260 and the second flexible circuit board 270 may be electrically connected to each other. One side of the connection wires 267 is electrically connected to the voltage supply unit 280, and the other side of the connection wires 267 is electrically connected to the common voltage wires 277 provided on the second flexible circuit board 270. can An adhesive member 290 may be provided between the connection wires 267 and the common voltage wires 277 . The adhesive member 290 has a conductive ball 291 therein, and the connection wires 267 and the common voltage wires 277 can be electrically connected through the conductive ball 291.

The second circuit film 263 is provided below the driving voltage lines 265 and the connection lines 267 . The second circuit film 263 protects the driving voltage wires 265 and the connection wires 267 . In this case, the other sides of the connection wires 267 that are not connected to the voltage supply unit 280 are exposed without being covered by the second circuit film 263 . Other sides of the exposed connection wires 267 are electrically connected to the common voltage wires 277 .

The second flexible circuit board 270 is attached on the second pads 223 . The second flexible circuit board 270 includes a third circuit film 271 , a fourth circuit film 273 , and common voltage lines 277 . Common voltage lines 277 are provided on the upper surface of the third circuit film 271 . Each of the common voltage lines 277 applies the common voltage applied from the voltage supply unit 280 to the second electrode 240 . To this end, one side of the common voltage lines 277 is electrically connected to the connection lines 267 and the other side of the common voltage lines 277 is electrically connected to the second pads 223 . The fourth circuit film 273 is provided on the common voltage wires 277 . The fourth circuit film 273 protects the common voltage wires 277 .

The voltage supply unit 280 supplies a driving voltage to the first electrode 230 and a common voltage to the second electrode 240 . The voltage supply unit 280 may be connected to the first flexible circuit board 260 . When a driving voltage is applied to the first electrode 230 and a common voltage is applied to the second electrode 240, the liquid crystals 251a and the dichroic dye 251b of the liquid crystal layer 250 are ionic materials 251c. ) are randomly moved by In this case, since light incident on the liquid crystal layer 250 may be scattered by the randomly moving liquid crystals 251a or absorbed by the dichroic dyes 251b, the light control device 200 implements a light blocking mode. can

8 and 9 are cross-sectional views showing one cross-section of a transparent display device according to a first embodiment of the present invention. 8 is a cross-sectional view of one side of the transparent display device having a second protrusion, and FIG. 9 is a cross-sectional view of one side of the transparent display device having a first protrusion. This relates to the transparent display device according to FIGS. 1 to 7 described above, and the same reference numerals are assigned to the same components, and repeated descriptions of the materials and structures of each component are omitted.

Referring to FIG. 8 , the first base film 210 is disposed to face the second base film 220, and a second protrusion 221 is provided on one side of the second base film 220. The lower plate 400 is disposed below the first base film 210 to protect the light control device 200 . In this case, one side of the lower plate 400 facing the second protrusion 221 protrudes more than the first base film 210 .

According to an embodiment of the present invention, in order to reduce the bezel area of the transparent display device, the second protrusion 221 and the second flexible circuit board 270 may be disposed on the side of the lower plate 400 . Accordingly, the second protrusion 221 and the second flexible circuit board 270 bonded to the second protrusion 221 may be bent in one side direction (-Z axis direction) of the lower plate 400 . In this case, since the first base film 210 protrudes more than the lower plate 400 in the conventional transparent display device, the second protrusion 221 and the second flexible circuit board 270 are provided to reduce the bezel area. When the lower plate 400 is bent in one side direction (-Z-axis direction), the second base film 220 and the first base film 210 may be in contact with each other. Accordingly, a problem in that the second electrode 240 provided on the second base film 220 and the first electrode 230 provided on the first base film 210 are short-circuited may occur.

However, since one side of the lower plate 400 facing the second protrusion 221 protrudes more than the first base film 210 in the transparent display device according to the first embodiment of the present invention, the second protrusion 221 ) and the second flexible circuit board 270 are bent in the direction of one side of the lower plate 400 (-Z-axis direction), the contact between the first base film 210 and the second base film 220 is prevented. It can be prevented. Accordingly, a short between the first electrode 230 and the second electrode 240 can be prevented, and the light control device 200 can be normally driven.

Referring to FIG. 9 , a first protrusion 211 is provided on one side of the first base film 210 . The first flexible circuit board 260 is adhered to the first protrusion 211 . Here, the lower plate 400 is disposed below the first base film 210 . In order to reduce the bezel area of the transparent display device, the first flexible circuit board 210 bonded to the first protrusion 211 and the second protrusion 211 is directed toward one side of the lower plate 400 (-Z-axis direction). can be bent into Even if the first protrusion 211 and the first flexible circuit board 210 according to the embodiment of the present invention are bent in one side direction (-Z axis direction) of the lower plate 400, the second base film 220 do not come into contact with Therefore, the light control device 200 normally drives the first protrusion 211 and the first flexible circuit board 210 without being affected by bending in one side direction of the lower plate 400 (-Z axis direction). It can be.

10 is a cross-sectional view showing a cross-section of one side of a transparent display device according to a second exemplary embodiment of the present invention. This is a cross-sectional view showing a cross-section of one side of the transparent display device provided with the second protrusion. In the transparent display device according to the second embodiment of the present invention, the first base film 210 protrudes more than the lower plate 400, and the spacer 295 is between the first base film 210 and the second base film 220. ) is the same as the transparent display device according to the first embodiment of the present invention, except for being provided. Therefore, in the following description, only the first base film 210, the spacer 295, and components related thereto will be described, and redundant descriptions of the components other than these will be omitted.

Referring to FIG. 10 , the first base film 210 according to the second embodiment of the present invention may be provided on the same line as the lower plate 400 or protruded from the lower plate 400 . In this case, a spacer 295 may be additionally provided between the second protrusion 221 and the adhesive member SL. The spacer 295 is disposed between the first base film 210 and the second base film 220 . The spacer 295 maintains a gap between the first base film 210 and the second base film 220 . The spacer 295 may be disposed at an outermost portion of the barrier ribs 252 . The spacer 295 may be spaced apart from the outermost barrier rib 252 by a predetermined distance. The spacer 295 may be simultaneously prepared through the same process as the barrier rib 252 and may be made of the same material. The spacer 295 may have a stripe shape, but is not necessarily limited thereto and may have various shapes.

In the transparent display device according to the second exemplary embodiment of the present invention, since the spacer 295 is provided between the first base film 210 and the second base film 220, the first base film 210 is a lower plate ( 400), it is possible to prevent the first base film 210 and the second base film 220 from contacting each other even if they are on the same line or protrude. Accordingly, a short between the first electrode 230 and the second electrode 240 can be prevented, and the light control device 200 can be normally driven.

11 is a cross-sectional view showing a cross-section of one side of a transparent display device according to a third exemplary embodiment of the present invention. This is because the spacer 295 is added between the first base film 210 and the second base film 220 in the transparent display device according to the first embodiment of the present invention. Therefore, in the following description, only the spacer 295 and components related thereto will be described, and redundant descriptions of the other components will be omitted.

Referring to FIG. 11 , a spacer 295 is provided between the first base film 210 and the second base film 220 according to the third embodiment of the present invention. The spacer 295 may be disposed between the second protrusion 221 and the adhesive member SL. The spacer 295 maintains a gap between the first base film 210 and the second base film 220 . The spacer 295 may be simultaneously prepared through the same process as the barrier rib 252 and may be made of the same material. In addition, the spacer 295 may have a cylindrical shape or a stripe shape, but is not necessarily limited thereto and may have various shapes.

The transparent display device according to the third embodiment of the present invention provides the same effect as the transparent display device according to the first embodiment of the present invention. In addition, since the spacer 295 is additionally provided between the first base film 210 and the second base film 220, the second protrusion 221 and the second flexible circuit board 270 are connected to the lower plate 400. ), contact between the first base film 210 and the second base film 220 may be further prevented. Accordingly, a short between the first electrode 230 and the second electrode 240 can be further prevented, and the light control device can be normally driven.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which the present invention belongs that various substitutions, modifications, and changes are possible without departing from the technical details of the present invention. It will be clear to those who have knowledge of Therefore, the scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts 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 211: first protrusion
220: second base film 221: second protrusion
230: first electrodes 240: second electrode
250: liquid crystal layer 251: liquid crystal cell
253: first alignment layer 254: second alignment layer
252: bulkhead 260: first flexible circuit board
270: second flexible circuit board 300: adhesive layer
400: lower plate

Claims (10)

a first base film having a first protrusion;
a second base film having a second protrusion;
a liquid crystal layer disposed between the first and second base films;
second pads provided under the second protrusion of the second base film;
a second flexible circuit board attached to the second pads; and
Including a lower plate disposed under the first base film,
The first protrusion is not covered by the second base film, the second protrusion is not covered by the first base film,
The first protrusion is disposed on one side of the first base film,
The second protrusion is disposed on one side of the second base film corresponding to one side of the first base film,
The second protrusion and the second flexible circuit board are bent in a direction of one side of the lower plate;
The light control device of claim 1 , wherein the bent second protrusion and the second flexible circuit board are spaced apart from one side of the first base film. According to claim 1,
The light control device further comprising first pads provided on the first protrusion of the first base film. According to claim 2,
The light control device further comprising a first flexible circuit board attached to the first pads. According to claim 3,
The light control device of claim 1 , wherein the first flexible circuit board and the second flexible circuit board are electrically connected to each other. According to claim 4,
and a voltage supply unit provided on one side of the first flexible circuit board to supply a driving voltage to the first pads and a common voltage to the second pads. delete According to claim 1,
The light control device of claim 1 , wherein one side of the lower plate facing the second protrusion protrudes more than the first base film. According to claim 1,
Adhering the first and second base films, further comprising an adhesive member provided on the edges of the first base film and the second base film,
and a spacer disposed between the first and second protrusions and the adhesive member to maintain a gap between the first and second base films. According to claim 8,
a first electrode provided on the first base film and connected to first pads provided on the first protrusion of the first base film; and
The light control device further comprises a second electrode provided under the second base film and connected to the second pads. a transparent display panel that transmits light and displays an image; and
a light control device disposed on at least one surface of the transparent display panel;
The light control device is a transparent display device comprising the light control device according to any one of claims 3 to 5, 7, and 8.

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