KR20190010326A - Light controlling apparatus, and transparent display device using the same - Google Patents

Abstract

An objective of the present invention is to provide a light controlling apparatus capable of preventing a bright room contrast ratio and luminance from being lowered and a transparent display device including the same. The light controlling apparatus comprises: first and second base films facing each other; a first electrode disposed on the first base film; a second electrode disposed on one surface of the second base film facing the first base film; a crystal cell of a light shielding unit disposed between the first and second base films and capable of driving a transmittance mode and a light shielding mode; and a crystal cell of a reflective unit capable of driving the transmittance and light shielding modes.

Description

TECHNICAL FIELD [0001] The present invention relates to a light control device and a transparent display device including the same. BACKGROUND OF THE INVENTION [0002]

The present invention relates to a light control device and a transparent display device including the same.

Recently, as the information age is approaching, a display field for processing and displaying a large amount of information has been rapidly developed, and various display devices have been developed in response to this.

Specific examples of such a display device include a liquid crystal display device (LCD), a plasma display panel (PDP), a field emission display device (FED), an electroluminescent display device An electroluminescence display device (ELD), and an organic light emitting diode device (OLED). The display device has excellent performance in terms of thinness, light weight, and low power consumption, and the application field of the display device is continuously increasing. In particular, in most electronic devices and mobile devices, a display device is used as one of the user interfaces.

In recent years, studies have been made actively on a transparent display device which allows a user to view objects or images located on the opposite side through a display device.

The transparent display device has advantages of space utilization, interior and design, and can have various application fields. The transparent display device realizes the functions of information recognition, information processing, and information display in a transparent electronic device, thereby solving the spatial and visual restrictions of the existing electronic device. Such a transparent display device can be used for a smart window, and a smart window can be applied to a smart home or a smart car window.

However, in the transparent display device, external light is transmitted through the device in order to make it possible to see an object or a background located on the back surface. This causes a problem that the bright room contrast ratio and the luminance are deteriorated. Therefore, there is a need for a light control device for preventing the bright room contrast ratio and luminance from lowering when displaying information on a transparent display device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light control device and a transparent display device including the same, which can prevent the bright room contrast ratio and brightness from being lowered.

According to an aspect of the present invention, there is provided a plasma display panel comprising a first base film and a second base film facing each other, a first electrode disposed on the first base film, A liquid crystal cell disposed between the first base film and the second base film and capable of driving the transmission mode and the light shielding mode, and a reflective liquid crystal cell capable of driving the transmissive mode and the reflective mode, A light control device including a cell and a transparent display device including the same are provided.

The transparent display device according to the embodiment of the present invention can prevent the bright room contrast ratio and the luminance from being lowered by applying the light control device capable of both the light shielding mode, the reflection mode, and the transmission mode.

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art 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 showing a transparent display panel, a gate driver, a source drive IC, a flexible film, a circuit board, and a timing controller of a transparent display device according to an embodiment of the present invention.
3 is a perspective view showing a transparent display panel and a light control device of a transparent display device according to an embodiment of the present invention.
4 is a cross-sectional view of the transparent display panel according to the embodiment of the present invention, taken along line I-I 'of FIG.
5 is a sectional view taken along line II-II 'of FIG. 3, and is a cross-sectional view of a light control device according to the first embodiment of the present invention.
6 is a cross-sectional view of a light control device according to a second embodiment of the present invention.
7 is a cross-sectional view of a light control device according to a third embodiment of the present invention.

The meaning of the terms described herein should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms. It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one. The term "on" means not only when a configuration is formed directly on top of another configuration, but also when a third configuration is interposed between these configurations.

Hereinafter, preferred embodiments of a light control device and a transparent display device including the same according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

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 showing a transparent display panel, a gate driver, a source drive IC, a flexible film, a circuit board, and a timing controller of a transparent display device according to an embodiment of the present invention. 3 is a perspective view showing a transparent display panel and a light control device of a transparent display device according to an embodiment of the present invention.

Hereinafter, a transparent display device according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG. 1 to 3, the X axis represents the direction parallel to the gate lines, the Y axis represents the direction parallel to the data lines, and the Z axis represents the height direction of the transparent display device.

1 to 3, a transparent display device according to an embodiment of the present invention includes a transparent display panel 100, a gate driver 120, a source driver integrated circuit (IC) 130 A flexible film 140, a circuit board 150, a timing control unit 160, a light control device 200, and an adhesive layer 300. [

Although the transparent display device according to the embodiment of the present invention has been described as being implemented with an organic light emitting display, it may be implemented as a liquid crystal display (LCD) 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 a sealing substrate. The lower substrate 111 is formed to be larger than the upper substrate 112 so that a part of the lower substrate 111 can be exposed without being covered by the upper substrate 112. Gate lines and data lines are formed in the display area DA of the transparent display panel 100, and light emitting parts may be formed in the intersecting areas of the gate lines and the data lines. The light emitting units of the display area DA can display an image.

The display area DA of the transparent display panel 100 includes a plurality of pixels P. [ Each of the pixels P according to the embodiment of the present invention includes a first green subpixel GP1, a second green subpixel GP2, a red subpixel RP, and a blue subpixel GP2, (BP) as one unit pixel.

The first green subpixel GP1 and the second green subpixel GP2 emit green light. Two sizes of the first green subpixel GP1 and the second green subpixel GP2 may be the same as the sizes of one red subpixel RP or blue subpixel BP.

The red subpixel RP emits red light and the blue subpixel BP emits blue light. At this time, the red subpixel RP and the blue subpixel BP according to the embodiment of the present invention may be changed in position with respect to neighboring pixels P. More specifically, when the arrangement of the sub-pixels included in the first pixel P1 is clockwise, the first green sub-pixel GP1, the second green sub-pixel GP2, the blue sub-pixel BP, Pixels RP are disposed in the order of the first green subpixel GP1, the second green subpixel GP2, the red subpixel RP, and the second subpixel GP2, , And a blue sub-pixel (BP). That is, the blue sub-pixel BP of the first pixel P1 is disposed so as to intersect diagonally with the blue sub-pixel BP of the second pixel P2, and the red sub-pixel RP of the first pixel P1, Are arranged so as to cross diagonally with the red sub-pixels RP of the second pixel P2. As described above, in the transparent display panel 100 according to the embodiment of the present invention, the positions of the red subpixel RP and the blue subpixel BP arranged for the neighboring pixels P are changed from each other, The reflective mode and the light shielding mode of the light control device 200 can be applied to all color sub-pixels.

3, each of the pixels P includes a green subpixel GP, a red subpixel RP, and a blue subpixel BP. However, the present invention is not limited thereto. For example, each of the pixels P may further include a white sub-pixel in addition to a green sub-pixel GP, a red sub-pixel RP, and a blue sub-pixel BP. Alternatively, each of the pixels P may include at least two sub-pixels among red, green, blue, yellow, magenta, and cyan.

The gate driver 120 supplies gate signals to the gate lines according to a gate control signal input from the timing controller 160. In FIG. 2, the gate driver 120 is formed on the outside of one side of the display area DA of the transparent display panel 100 in a gate driver in panel (GIP) manner, but the present invention is not limited thereto. That is, the gate driver 120 may be formed by a GIP method on both sides of the display area DA of the transparent display panel 100, or may be mounted on a flexible film, Or may be attached to the transparent display panel 100 in a similar manner.

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

Since the size of the lower substrate 111 is larger than that of the upper substrate 112, a part of the lower substrate 111 can be exposed without being covered by the upper substrate 112. Pads such as data pads are provided on a part of the lower substrate 111 that is not covered by the upper substrate 112 and is exposed. Wires connecting the pads to the source drive IC 130 and wirings connecting the pads to the wirings of the circuit board 150 may be formed on the flexible film 140. The flexible film 140 is adhered to the pads using an anisotropic conducting film, whereby the pads and the wirings of the flexible film 140 can be connected.

remind The circuit board 150 may be attached to the flexible films 140. The circuit board 150 may be implemented with a plurality of circuits implemented with driving chips. For example, the timing control unit 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.

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

In such a transparent display panel 100, external light is transmitted through the panel in order to make it possible to see an object or a background located on the back surface, thereby causing a problem of a bright room contrast ratio and a luminance. Therefore, in order to prevent the bright room contrast ratio from being lowered when information is displayed on the transparent display panel 100, a light control device 200 capable of implementing a light shielding mode for blocking light is needed. Further, in order to prevent the luminance from lowering when displaying information on the transparent display panel 100, there is a need for a light control device 200 capable of realizing a reflection mode for increasing the luminous efficiency. Therefore, the transparent display device according to the embodiment of the present invention can prevent the bright room contrast ratio and brightness from being lowered by applying the light control device 200 capable of both the light shielding mode, the reflection mode, and the transmission mode.

The light control device 200 includes a reflection part RFA and a light shielding part LSA. The reflector RFA reflects light emitted from the transparent display panel 100, thereby increasing the luminous efficiency and increasing the brightness of the transparent display device. The light-shielding portion LSA blocks external light to prevent the bright-room contrast ratio of the transparent display device from being lowered. The reflective portion RFA and the light shielding portion LSA overlap the pixel P of the transparent display panel 100 and the reflective portion RFA and the light shielding portion LSA each include one Pixels P included in the unit pixel P.

More specifically, the reflection part RFA and the light shielding part LSA are repeatedly arranged in a straight line in the light control device 200 as shown in Fig. At this time, the first green sub-pixel GP1 and the red sub-pixel RP included in the first pixel P1 of the transparent display panel 100 and the first green sub-pixel GP1 included in the second pixel P2 And the blue sub-pixel BP overlap the reflective portion RFA. Therefore, when the reflective portion RFA of the light control device 200 is driven in the reflective mode, the transparent display device according to the embodiment of the present invention realizes some sub-pixels in a reflective mode in one pixel P, The sub-pixel may be implemented in the transmissive mode, and the transmissive display device may be implemented while increasing the luminous efficiency of the pixel P.

The second green subpixel GP2 and the blue subpixel BP included in the first pixel P1 of the transparent display panel 100 and the second green subpixel GP2 included in the second pixel P2 And the red sub-pixel RP overlap the light-shielding portion LSA. Therefore, when the light shielding unit LSA of the light control device 200 is driven in the light-shielding mode, the transparent display device according to the embodiment of the present invention realizes a sub-pixel in a shading mode in one unit pixel P The remaining sub-pixels may be implemented in a transmissive mode, and the transparent display device may be implemented while increasing the bright-room contrast ratio of the pixel P.

In the light control device 200, the reflective portion RFA and the light-shielding portion LSA are repeatedly arranged in a linear form. However, in the light control device 200, the red sub- And the positions of the blue sub-pixels BP are changed from each other, the reflective mode and the light-shielding mode of the light control device 200 can be applied to all color sub-pixels. A detailed description of the light control device 200 according to the embodiment of the present invention will be given later with reference to FIGS. 5 to 7. FIG.

remind The adhesive layer (300) bonds the transparent display panel (100) and the light control device (200). The adhesive layer 300 may be provided in the same size as the light control device 200, but is not limited thereto. The adhesive layer 300 may be a transparent adhesive such as OCA (optically clear adhesive) or a transparent adhesive such as OCR (optically clear resin). In this case, the adhesive layer 300 may have a refractive index of 1.4 to 1.9 for refractive index matching between the transparent display panel 100 and the light control device 200.

4 is a cross-sectional view of the transparent display panel according to the embodiment of the present invention, taken along line I-I 'of FIG.

Referring to FIG. 4, a sub-pixel according to an embodiment of the present invention may include a transistor T, an anode electrode AND, an organic layer EL, and a cathode electrode CAT.

The transistor T includes an active layer ACT provided on the lower substrate 111, a first insulating film I1 provided on the active layer ACT, a gate electrode GE provided on the first insulating film I1, A second insulating film I2 provided on the gate electrode GE and a source electrode connected to the active layer ACT through the first and second contact holes H1 and H2 provided on the second insulating film I2. (SE) and a drain electrode (DE). In FIG. 4, the transistor T is of the top gate type. However, the present invention is not limited thereto, and may be a bottom gate type 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 H3 passing through the interlayer insulating film ILD provided on the source electrode SE and the drain electrode DE do. A bank W is provided between the adjacent anode electrodes (AND), whereby the adjacent anode electrodes (AND) can be electrically isolated.

The 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.

The cathode electrode (CAT) is provided on the organic layer (EL) and the bank (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 transporting layer and the electron transporting layer, respectively. Therefore, the light emitting region includes a region where the anode electrode (AND), the organic light emitting layer (EL), and the cathode electrode (CAT) overlap. At this time, the anode electrode (AND) and the cathode electrode (CAT) according to the embodiment of the present invention are preferably formed of a transparent metal material such as ITO or IZO.

5 is a sectional view taken along line II-II 'of FIG. 3, and is a cross-sectional view of a light control device according to the first embodiment of the present invention.

5, a light control device 200 according to an embodiment of the present invention includes a first base film 210, a second base film 220, a first electrode 230, a second electrode 240, And a liquid crystal layer 250.

remind The first base film 210 and the second base film 220 are disposed to face each other. 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 be formed of a cellulose resin such as TAC (triacetyl cellulose) or DAC (diacetyl cellulose), a cycloolefin (COP) such as Norbornene derivatives, polyolefin such as poly (polycarbonate), PE (polyethylene) or PP (polypropylene), PVA (polyvinyl alcohol), PES polyether sulfone, polyether sulfone, polyetheretherketone (PEEK), polyetherimide (PEI), polyethylenenaphthalate (PEN), and polyethyleneterephthalate (PET); polyimide; polysulfone; or fluoride resin But is not limited thereto.

The first electrode 230 includes a reflective first electrode 231 and a transmissive first electrode 232 and is disposed on the first base film 210 to face 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. Each of the first and second electrodes 230 and 240 may be a transparent electrode. For example, each of the first and second electrodes 230 and 240 may include an oxide (e.g., AgO or Ag2O or Ag2O3), an aluminum oxide (e.g., Al2O3), a tungsten oxide (e.g., WO2 or WO3 or W2O3) (Eg, MgO), molybdenum oxide (eg MoO3), zinc oxide (eg ZnO), tin oxide (eg SnO2), indium oxide (eg In2O3), chromium oxide (eg CrO3 or Cr2O3) (E.g., Sb2O3 or Sb2O5), titanium oxides such as TiO2, nickel oxides such as NiO, copper oxides such as CuO or Cu2O, vanadium oxides such as V2O3 or V2O5, ), Iron oxide (eg Fe2O3 or Fe3O4), niobium oxide (eg Nb2O5), indium tin oxide (eg ITO), indium zinc oxide (eg IZO) Aluminum doped zinc oxide (ZAO), aluminum-doped tin oxide (eg, aluminum tin oxide, TAO) or antimony tin oxide (eg, Antimony Tin Oxide, AT O), but is not limited thereto.

The liquid crystal layer 250 of the light control device 200 according to the embodiment of the present invention has the liquid crystal layer 250a of the light shielding portion LSA on one side and the liquid crystal layer 250a on the other side of the reflection portion RFA (250b). The light control device 200 according to the embodiment of the present invention includes a light shielding part LSA capable of a light shielding mode and a reflection part RFA capable of a reflection mode in one liquid crystal layer 250, All the brightness can be improved.

remind The partition wall PW is disposed on the first base film 210. The barrier ribs PW may be provided vertically from the first base film 210, but are not limited thereto. The partition PW may be formed of a transparent material. In this case, the barrier rib PW may be formed of any one of a photoresist, a photocurable polymer, and polydimethylsiloxane, but is not limited thereto.

The liquid crystal layer 250a of the light-shielding portion LSA may be a dynamic scattering mode liquid cyrstal layer including liquid crystals, dichroic dyes, and ionic materials. have. In the dynamic scattering mode, when voltages are applied to the first and second electrodes 231 and 240, the liquid crystals and the dichroic dyes are randomly moved by the ionic materials. In this case, the light incident on the liquid crystal layer 250a of the light-shielding portion (LSA) can be scattered by the liquid crystal moving at random or absorbed by the dichroic dyes, so that a light shielding mode can be realized.

In addition, the liquid crystal layer 250a of the light-shielding portion (LSA) may be a guest host liquid crystal layer including liquid crystals and dichroic dyes. In this case, the liquid crystals may be a host material and the dichroic dyes may be a guest material.

In addition, the liquid crystal layer 250a of the light-shielding portion (LSA) may be a polymer network liquid crystal layer including liquid crystals, dichroic dyes, and a polymer network. In this case, the liquid crystal layer 250a of the light-shielding portion LSA can increase the scattering effect of the light incident due to the polymer network. When a polymer network is included, the light shielding ratio can be increased as compared with the case where the polymer network is not shielded. 5, the liquid crystal layer 250a of the light-shielding part (LSA) is embodied as a dynamic-scattering mode liquid crystal layer for convenience of explanation.

Specifically, the liquid crystal layer 250a of the light-shielding portion LSA according to the embodiment of the present invention may include a light-shielding portion liquid crystal cell 251, a first alignment layer 253, and a second alignment layer 254. [

The light-shielding liquid crystal cell 251 includes liquid crystals 251a, dichroic dyes 251b, and ionic materials 251c disposed between the first base film 210 and the second base film 220 do. The long axis direction of the liquid crystals 251a may be a positive direction 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. [ Liquid crystals. Even if no voltage is applied to the first and second electrodes 231 and 240 as in the case of the liquid crystal 251a in the long axis direction of the dichroic dyes 251b, the first and second alignment layers 253 and 254 may vertically Z-axis direction). Accordingly, the light control device 200 can operate in the transmission mode even when no voltage is applied, so that the transmission mode can be realized without power consumption.

The dichroic dyes 251b may be dyes that absorb light. For example, the dichroic dyes 251b absorb light other than a black dye or a specific color (e.g., red) wavelength band that absorbs all of light in a visible light wavelength range and emit light of a specific color ), Which reflects the light of the wavelength band. In the embodiment of the present invention, the dichroic dyes 251b are black dyes. However, the present invention 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. have. In other words, the embodiment of the present invention can shield the back background while expressing various colors in the light shielding mode. Accordingly, the embodiment of the present invention can provide various colors in the light shielding mode, so that the user can feel 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 a public window requiring a transmission mode and a light-shielding mode, So that the light can be shielded.

The ionic material 251c serves to move the liquid crystals and the dichroic dyes randomly. The ionic material 251c may have a predetermined polarity so that the first electrode 231 or the second electrode 240 may be formed in accordance with the polarity of the voltage applied to the first electrode 231 and the second electrode 240. [ . ≪ / RTI > For example, when the ionic material 251c has 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, And moves to the one electrode 231. When the ionic material 251c has a negative polarity, when a positive voltage is applied to the second electrode 240 and a negative voltage is applied to the first electrode 231, (240). When the ionic material 251c has a positive polarity, when a positive voltage is applied to the first electrode 231 and a negative voltage is applied to the second electrode 240, (240). If the ionic material 251c has a positive polarity and a positive voltage is applied to the second electrode 240 and a negative voltage is applied to the first electrode 231, (231). Therefore, when a voltage is applied to the first and second electrodes 231 and 240, the ion material 251c travels from the first electrode 231 to the second electrode 240 at a predetermined cycle, ). ≪ / RTI > In this case, the liquid crystal 251a and the dichroic dyes 251b are randomly moved since the ionic materials 251c move to hit the liquid crystals 251a and the dichroic dyes 251b. The voltage applied to the first and second electrodes 231 and 240 may be an alternating voltage.

In addition, the ion materials 251c can exchange electrons with each other according to the polarity of the voltage applied to the first electrode 231 and the second electrode 240. [ Therefore, when an AC voltage having a predetermined period is applied to the first and second electrodes 231 and 240, the ion material 251c exchanges electrons with a predetermined period. In this case, the electrons move to hit the liquid crystal 251a and the dichroic dye 251b, so that the liquid crystal 251a and the dichroic dye 251b move randomly. The voltage applied to the first and second electrodes 231 and 240 may be an alternating voltage.

The first alignment film 253 is disposed on the first base film 210. The first alignment film 253 is disposed on the first electrode 231 facing the second base film 220. In addition, the first alignment film 253 surrounds the side surface and the upper surface of the partition PW. The first alignment layer 253 arranges the light shielding liquid crystal cells 251 in the vertical direction (Z-axis direction).

remind The second alignment film 254 is provided on one surface of the second electrode 240 facing the first base film 210. The first and second alignment films 253 and 254 are formed so that the longitudinal axes of the liquid crystals 251a and the dichroic dyes 251b are aligned in the vertical direction Z-axis direction). The first and second alignment layers 253 and 254 may be polyimide (PI).

The liquid crystal layer 250b of the reflective portion RFA according to the embodiment of the present invention may include a reflective liquid crystal cell 252, a first alignment layer 253, and a second alignment layer 254. [

The reflective liquid crystal cell 252 includes cholesteric liquid crystals 252 a disposed between the first base film 210 and the second base film 220.

As shown in FIG. 5, in the transmissive mode, the cholesteric liquid crystals 252a are in a homeotropic state in the liquid crystal layer 250b of the reflective portion RFA. The cholesteric liquid crystals 252a of the liquid crystal layer 250b of the reflection part RFA have a property of positive liquid crystal so as to be phase-changed from a planar state to a homeotropic state, A vertical electric field vef must be applied to the liquid crystal layer 250b of the RFA. The vertical electric field vef is applied to the first electrode 232 and the second electrode 240 when the difference between the voltage applied to the first electrode 232 and the voltage applied to the second electrode 240 is greater than the first reference voltage, Refers to an electric field formed between the electrode 232 and the second electrode 240.

In order to equally apply the vertical electric field (vef) to the cholesteric liquid crystals 252a in the transmission mode, the interval between the split electrodes 232a, 232b and 232c of the first electrode 232 is set to be shorter than the interval between the split electrodes 232a and 232b And 232c, respectively.

The light control device 100 according to the embodiment of the present invention includes a light shielding part LSA capable of blocking external light on one side and a light shielding part on the other side of the light control device 100, And a reflective portion RFA capable of reflecting light can be disposed. The light control device 200 according to the first embodiment of the present invention can display the background at the same time the image is displayed on the transparent display device in which both the light shielding portion LSA and the reflection portion RFA are in the transmission mode. The light control device 200 according to the first embodiment of the present invention is configured such that the transmissivity of the light-shielding portion LSA is about 70%, the transmissivity of the reflective portion RFA is about 85%, the transmissivity of the transparent display panel 100 Is about 60%, the transmittance of the transparent display device including the light control device 200 and the transparent display panel 100 is about 47%, and the luminance is about 600 nit.

The transparent display device has the problem that the external light passes through the panel in order to make it possible to see an object or a background located on the back surface, thereby reducing the contrast ratio and luminance of the bright room. Therefore, when the information is displayed on the transparent display panel 100, the light control device 200 needs a light-shielding mode for blocking the light to prevent the bright-room contrast ratio from being lowered. Further, in order to prevent the luminance from lowering when information is displayed on the transparent display panel 100, the light control device 200 needs a reflection mode for increasing the luminous efficiency.

6 is a cross-sectional view of a light control device according to a second embodiment of the present invention. The light control device 200 shown in Fig. 6 is the same as the light control device 200 according to the first embodiment described above with reference to Fig. 5, except for the reflection liquid crystal cell 252. [ Accordingly, only the reflective liquid crystal cell 252 will be described in the following description, and redundant description of the same constitution will be omitted.

Referring to FIG. 6, in the light control device 200 according to the second embodiment of the present invention, the reflection liquid crystal cell 252 is driven in the reflection mode. The cholesteric liquid crystals 252a of the reflective liquid crystal cell 252 can be controlled in a planar state in the reflection mode. In the planar state, the helical axes of the cholesteric liquid crystals 252a may be arranged in a horizontal direction (y-axis direction), that is, in a direction parallel to the first base film 210. The cholesteric liquid crystals 252a of the reflective liquid crystal cell 252 have a property of a positive liquid crystal and are arranged in the reflective liquid crystal cell 252 to change the phase from a homeotropic state to a planar state ) Must be applied with a horizontal electric field (hef).

In the optical control apparatus 200 according to the second embodiment of the present invention, the light-shielding portion LSA is driven in the transmissive mode, and the reflective portion RFA is driven in the reflective mode. Therefore, in the light control device 200 according to the second embodiment of the present invention, since the light-shielding portion LSA is driven in the transmissive mode and the backlight can be seen, the reflective portion RFA is driven in the reflective mode, The light emitted from the light source 100 may be reflected to increase the luminous efficiency. The light control device 200 according to the second embodiment of the present invention is configured such that the transmissivity of the light shielding portion LSA is about 70% and the transmissivity of the transparent display panel 100 is about 60% And the transparent display panel 100, the transmittance of the transparent display device is about 42%, and the luminance is about 714 nit. The light control device 200 according to the second embodiment of the present invention has a light transmittance of 5 (light source), which is lower than that of the light control device 200 according to the first embodiment in which both the light shielding part LSA and the reflection part RFA are driven in the transmission mode %, But the luminance is further increased by 114 nit.

7 is a cross-sectional view of a light control device according to a third embodiment of the present invention. The light control device 200 shown in Fig. 7 is the same as the light control device 200 according to the second embodiment described above with reference to Fig. 6, except for the shielding part liquid crystal cell 251. [ Accordingly, only the light-shielding portion liquid crystal cell 251 will be described in the following description, and redundant description of the same constitution will be omitted.

In the optical control apparatus 200 according to the third embodiment of the present invention, the light-shielding unit LSA is driven in the light-shielding mode, and the reflection unit RFA is driven in the reflection mode. Therefore, in the optical control apparatus 200 according to the third embodiment of the present invention, the light-shielding portion LSA is driven in the light-shielding mode to increase the bright room contrast ratio, the reflection portion RFA is driven in the reflection mode, do. The light control device 200 according to the third embodiment of the present invention is configured such that the transmissivity of the light shielding portion LSA is about 17% and the transmissivity of the transparent display panel 100 is about 60% And the transparent display panel 100, the transmittance of the transparent display device is about 10%, and the luminance is about 714 nit. The light control device 200 according to the third embodiment of the present invention has a lower transmittance than the light control device 200 according to the first embodiment in which both the light shielding portion LSA and the reflection portion RFA are driven in the transmission mode However, the luminance is increased by 114nit and the contrast ratio of bright room increases.

Therefore, the transparent display device according to the embodiment of the present invention can prevent the bright room contrast ratio and brightness from being lowered by applying the light control device 200 capable of both the light shielding mode, the reflection mode, and the transmission mode.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100: transparent display panel 111:
112: upper substrate 120: gate driver
130: Source drive IC 140: Flexible film
150: circuit board 160: timing controller
200: light control device 210: first base film
220: second base film 231, 232: first electrode
240: second electrode 250a, 250b: liquid crystal layer
251, 252: liquid crystal cell PW: barrier rib
253: first orientation film 254: second orientation film
300: adhesive layer

Claims (10)

A first base film and a second base film facing each other;
A first electrode disposed on the first base film;
A second electrode disposed on one surface of the second base film facing the first base film;
A light-shielding portion liquid crystal cell disposed between the first base film and the second base film and capable of driving a transmission mode and a light-shielding mode; And
And a reflective liquid crystal cell capable of driving the transmissive mode and the reflective mode. The method according to claim 1,
Wherein the light blocking portion liquid crystal cell is disposed on one side and the reflective liquid crystal cell is disposed on the other side with respect to a partition vertically disposed between the first base film and the second base film. The method according to claim 1,
Wherein the reflective liquid crystal cell includes cholesteric liquid crystals and the cholesteric liquid crystals are arranged in parallel with the first base film in the reflective mode. The method according to claim 1,
Wherein the light-shielding portion liquid crystal cell and the reflection liquid crystal cell are driven in the transmissive mode. The method according to claim 1,
Wherein the light-shielding portion liquid crystal cell is driven in the transmissive mode, and the reflective liquid crystal cell is driven in the reflective mode. The method according to claim 1,
Wherein the light-shielding portion liquid crystal cell is driven in the light-shielding mode, and the reflective liquid crystal cell is driven in the reflection mode. A transparent display panel having unit pixels including a plurality of sub-pixels; And
The light control device according to any one of claims 1 to 6, arranged on one surface of the transparent display panel,
Pixels in the one unit pixel overlap the liquid crystal cell in the light-shielding portion, and the remaining sub-pixels overlap the reflective liquid crystal cell. 8. The method of claim 7,
Wherein the unit pixel includes a first green sub pixel, a second green sub pixel, a blue sub pixel, and a red sub pixel,
The first green sub-pixel and the red sub-pixel overlap the light-shielding liquid crystal cell, and the second green sub-pixel and the blue sub-pixel overlap the reflective liquid crystal cell. 9. The method of claim 8,
And the red sub-pixel and the blue sub-pixel are mutually changed in position per neighboring unit pixel. 10. The method of claim 9,
The transparent display panel includes:
A transistor on the substrate;
An anode electrode electrically connected to the transistor;
An organic light emitting layer disposed on the anode electrode; And
And a cathode electrode disposed on the organic light emitting layer,
Wherein the anode electrode and the cathode electrode are made of a transparent material.

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