KR20170133815A - Organic light emitting display device - Google Patents

Abstract

The present invention provides an organic light emitting display device capable of blocking reflection of external light in a day mode and improving the transmittance of light emitted from an organic light emitting element in a night mode. The organic light emitting display device according to an embodiment of the present invention includes a light control film including a first base film and a second base film facing each other, a first electrode arranged on one side of the first base film facing the second base film, a second electrode arranged on one side of the second base film facing the first base film, and a guest-host liquid crystal layer arranged between the first electrode and the second electrode and including liquid crystals and dichroic dyes.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light-

The present invention relates to an organic light emitting display provided with a light control film.

Background of the Invention As the age of the information society develops, the importance of flat panel display devices (FPDs) having excellent characteristics such as thinning, lightening, and low power consumption is increasing. The flat panel display device includes a liquid crystal display device (LCD), a plasma display panel device (PDP), and an organic light emitting display device (OLED) Device (EPD: Electrophoretic Display Device) is also widely used.

Among them, liquid crystal display devices and organic light emitting display devices including thin film transistors are excellent in resolution, color display, image quality, and are widely commercialized as display devices for televisions, notebooks, tablet computers, or desktop computers. Particularly, OLEDs are attracting attention as a next generation flat panel display device because they have low power consumption, high response speed, high luminous efficiency, high luminance and wide viewing angle.

A conventional organic light emitting diode display includes a lower substrate, a thin film transistor, an organic light emitting diode, and an upper substrate. On the lower substrate, gate lines and data lines cross each other to define pixels, and each pixel is provided with a thin film transistor (TFT). The thin film transistor includes an active layer, a gate insulating film, a gate electrode, an interlayer insulating film, a source electrode and a drain electrode which are sequentially stacked. The organic light emitting element is provided on the thin film transistor, and is electrically connected to the thin film transistor. The upper substrate is provided on the organic light emitting element to protect the thin film transistor and the organic light emitting element.

However, when driving a conventional organic light emitting display device, the visibility of the display panel may be deteriorated by external light. That is, the external light can be incident from the outside into the display panel. The external light incident into the display panel may be reflected by the gate electrode, the source electrode, and the drain electrode disposed in the display panel and then emitted to the outside of the display panel. Accordingly, the visibility of the organic light emitting display panel may be deteriorated.

The contents of the background art described above are technical information acquired by the inventor of the present invention for the derivation of the present invention or obtained in the derivation process of the present invention, There is no number.

The present invention provides an organic light emitting display device capable of blocking reflection of external light in a daytime mode and improving transmittance of light emitted from an organic light emitting device in a night mode.

An organic light emitting display according to an embodiment of the present invention includes an organic light emitting display panel including a thin film transistor and an organic light emitting diode electrically connected to the thin film transistor, a phase delay film disposed on the organic light emitting display panel, And a light control film disposed on the film. Wherein the light control film comprises a first base film and a second base film facing each other, a first electrode disposed on one surface of the first base film facing the second base film, a second electrode facing the first base film, A second electrode disposed on one side of the second base film, and a guest-host liquid crystal layer disposed between the first and second electrodes, the liquid crystal layer including liquid crystals and dichroic dyes.

According to a preferred embodiment of the present invention, a light control film is disposed on an organic light emitting display panel and is driven in a daytime mode (light shielding mode) in which external light is blocked during a day when the light is greatly influenced by external light, In nighttime where there is little outside light, it is driven in night mode (transmission mode) to increase light transmittance. Accordingly, when driving in the daytime mode, external light can be effectively blocked, and when driven in the nighttime mode, the light transmittance can be improved and the power consumption can be reduced.

In addition to the effects of the present invention mentioned above, other features and advantages of the present invention will be described below, or may be apparent to those skilled in the art from the description and the description.

FIG. 1 is a perspective view illustrating an organic light emitting display according to an embodiment of the present invention. FIG.
2 is a plan view showing an organic light emitting display panel, a gate driver, a source drive IC, a flexible film, a circuit board, and a timing controller of an organic light emitting diode display according to an embodiment of the present invention.
3 is an exemplary view showing a pixel of the display area of FIG. 2;
4 is a sectional view taken along the line I-I 'of Fig. 3;
5 is a cross-sectional view showing a light control film according to an embodiment of the present invention.
6 is an exemplary view showing an organic light emitting display according to an embodiment of the present invention in a day mode.
7 is an exemplary view showing an organic light emitting display according to an embodiment of the present invention in a night mode.

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 that the first item, the second item or the third item, as well as the first item, the second 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 the organic light emitting display 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.

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

Hereinafter, an OLED display according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4. FIG. In FIGS. 1 to 4, 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 organic light emitting display device.

1 to 4, an organic light emitting display according to an exemplary embodiment of the present invention includes an organic light emitting display panel 100, a gate driver 120, a source driver IC (integrated circuit) A flexible film 140, a circuit board 150, a timing controller 160, a light control film 200, and a phase retardation film 300.

The organic light emitting display panel 100 includes a lower substrate 111 and an upper substrate 112. The upper substrate 112 may be an encapsulating 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 organic light emitting 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 portions of the display area DA can display an image.

The display area DA may include a light emitting area EA. The light emitting area EA may include a plurality of pixels P. [ Each of the pixels P may include, but is not limited to, a red light emitting unit RE, a green light emitting unit GE, and a blue light emitting unit BE as shown in FIG. For example, each of the pixels P may further include a white light emitting portion in addition to the red light emitting portion RE, the green light emitting portion GE, and the blue light emitting portion BE. Alternatively, each of the pixels P may include a red light emitting portion RE, a green light emitting portion GE, a blue light emitting portion BE, a yellow light emitting portion, a magenta light emitting portion, and a cyan light emitting portion At least two light emitting portions may be included in the portion.

The red light emitting portion RE is a region for emitting red light, the green light emitting portion GE is a region for emitting green light, and the blue light emitting portion BE is a region for emitting blue light. The red light emitting portion RE, the green light emitting portion GE, and the blue light emitting portion BE of the light emitting region EA emit predetermined light. The thin film transistor T and the organic light emitting diode OLED may be provided on the red light emitting portion RE, the green light emitting portion GE, and the blue light emitting portion BE, respectively, as shown in FIG.

The OLED display panel 100 includes a lower substrate 111, a thin film transistor T, a planarization layer (PAC), an organic light emitting diode OLED, and an upper substrate 112.

The lower substrate 111 may be a transparent organic substrate or a plastic film. For example, the lower substrate 111 may be made of a cellulose resin such as TAC (triacetyl cellulose) or DAC (diacetyl cellulose), a cycloolefin polymer (COP) such as Norbornene derivatives, a cyclo olefin copolymer Polyolefin, polyvinyl alcohol (PVA), polyether sulfone (PES), polyetheretherketone (PEEK), polyetheretherketone (PEEK) such as acrylic resin such as poly (methylmethacrylate), polycarbonate, polyethylene (PE) (Polyimide), a polysulfone (PSF), a fluoride resin, or the like, such as polyethylene terephthalate (PET), polyetherimide (PEI), polyethylenenaphthalate (PEN) But is not limited thereto.

The thin film transistor T is provided on the lower substrate 111. The thin film transistor T includes an active layer ACT, a first insulating film I1, a gate electrode GE, a second insulating film I2, a source electrode SE and a drain electrode DE.

The active layer ACT is provided on the lower substrate 111. The active layer ACT overlaps the gate electrode GE. The active layer ACT may include a first region located on the side of the source electrode SE, a second region located on the side of the drain electrode DE, and a center region located between the first region and the second region. The central region may be a semiconductor material that is not doped with a dopant, and the one end region and the other end region may be a semiconductor material doped with a dopant.

The first insulating film I1 is provided on the active layer ACT. The first insulating film I1 covers the active layer ACT. The first insulating film I1 may be a gate insulating film. The first insulating film I1 functions to insulate the active layer ACT from the gate electrode GE. For example, the first insulating layer I1 may be silicon dioxide (SiO2), silicon nitride (SiNx), silicon oxynitride (SiON), or a multilayer thereof, but is not limited thereto.

The gate electrode GE is provided on the first insulating film I1. The gate electrode GE overlaps the active layer ACT with the first insulating film I1 interposed therebetween. For example, the gate electrode GE may be formed of a metal such as Mo, Al, Cr, Au, Ti, Ni, Ne, But is not limited to, a single layer or a multi-layer made of any one or an alloy thereof.

The second insulating film I2 is provided on the gate electrode GE. The second insulating film I2 functions to insulate the gate electrode GE from the source electrode SE and the drain electrode DE. For example, the second insulating layer I2 may be silicon dioxide (SiO2), silicon nitride (SiNx), silicon oxynitride (SiON), or a multilayer thereof, but is not limited thereto.

The source electrode SE and the drain electrode DE are disposed apart from each other on the second insulating film I2. The first insulating film I1 and the second insulating film I2 are provided with a first contact hole CNT1 for exposing a part of one end region of the active layer ACT and a second contact hole CNT1 for exposing a part of the other end region of the active layer ACT. A contact hole CNT2 is provided. The source electrode SE is connected to one end region of the active layer ACT through the first contact hole CNT1 and the drain electrode DE is connected to the other end region of the active layer ACT through the second contact hole CNT2. Lt; / RTI > For example, the source electrode SE and the drain electrode DE may be formed of a metal such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium And copper (Cu), or an alloy thereof. However, the present invention is not limited thereto.

The structure of the thin film transistor T is not limited to the example described above, and can be variously modified to a known structure that can be easily practiced by those skilled in the art.

A planarizing layer (PAC) is provided on the thin film transistor T. The planarizing layer (PAC) functions to flatten the upper portion of the lower substrate 111 on which the thin film transistor T is provided. For example, the planarization layer (PAC) may be formed of an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, or the like But is not limited thereto.

The planarization layer PAC is provided with a third contact hole CNT3 for exposing a part of the drain electrode DE. And the drain electrode DE is electrically connected to the anode electrode AND through the third contact hole CNT3.

The organic light emitting device OLED is connected to the thin film transistor T. The organic light emitting element OLED is provided on the thin film transistor T. [ The organic light emitting device OLED includes an anode electrode (AND), an organic layer (EL), and a cathode electrode (CAT).

The anode electrode AND is connected to the drain electrode DE of the transistor T through the third contact hole CNT3 passing through the planarization layer PAC provided on the source electrode SE and the drain electrode DE . A bank B is provided between the adjacent anode electrodes (AND), so that the adjacent anode electrodes (AND) can be electrically isolated.

The organic layer EL is provided on the anode electrode (AND) and the bank (B). 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 partition (B). 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.

The upper substrate 112 is provided on the thin film transistor T and the organic light emitting element OLED. The upper substrate 112 may be an encapsulating substrate. The upper substrate 112 covers the thin film transistor T and the organic light emitting element OLED. The upper substrate 112 protects the thin film transistor T and the organic light emitting diode OLED from external impact. The upper substrate 112 functions to prevent moisture from penetrating into the organic light emitting display panel 100.

The gate driver 120 supplies the gate signals to the gate lines according to the gate control signal input from the timing controller 160. 2, the gate driver 120 is formed on the outside of one side of the display area DA of the organic light emitting display panel 100 in a gate driver in panel (GIP) manner. However, the present invention 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 organic light emitting display panel 100 by a GIP method, or may be formed as a driving chip, mounted on a flexible film, The organic light emitting display panel 100 may include a plurality of organic light emitting display panels.

The source driver IC 130 receives the digital video data and the 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 and the source drive IC 130 and wirings connecting the pads and the wirings of the circuit board 150 may be formed in 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.

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.

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. [

The light control film 200 is provided on the organic light emitting display panel 100. The light control film 200 is driven in the light shielding mode in which the light is incident from the outside in the daytime mode and shields external light reflected by the electrodes inside the display panel. In addition, the light control film 200 is driven in a transmissive mode for transmitting light emitted from the organic light emitting device OLED in the night mode. Accordingly, the embodiment of the present invention can cut external light in the daytime mode and increase the transmittance of light emitted from the organic light emitting device OLED in the night mode. When the light control film 200 is driven in the daytime mode, the external light is cut off, so that image deterioration due to external light can be prevented. In addition, when the light control film 200 is driven in the night mode, since the light transmittance is increased, the power consumption consumed for realizing a proper luminance can be reduced. A detailed description of the light control film 200 according to the embodiment of the present invention will be given later with reference to FIGS. 5 to 7. FIG.

The phase retardation film 300 is provided between the organic light emitting display panel 100 and the light control film 200. The retardation film 300 delays the phase of the light emitted from the organic light emitting device OLED. For example, the retardation film 300 may be a lambda / 4 phase retardation film. The phase retardation film 300 converts external light transmitted from the outside and transmitted by the light control film 200 into linearly polarized light or circularly polarized light. The phase retardation film 300 converts the light reflected by the electrodes (for example, a gate electrode, a source electrode, and a drain electrode) disposed in the organic light emitting display panel 100 into linearly polarized light or circularly polarized light .

5 is a cross-sectional view illustrating a light control film according to an embodiment of the present invention. This is a sectional view for explaining the light control film 200 shown in FIG. 1 in detail.

5, a light control film 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 guest-host liquid crystal layer 250.

The first base film 210 and the second base film 220 may be transparent 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 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 and the second electrode 240 are disposed to face each other.

The first electrode 230 and the second electrode 240 may be made of a transparent conductive material having conductivity and capable of transmitting external light. For example, the first and second electrodes 230 and 240 may be formed of an oxide such as AgO or Ag2O or Ag2O3, an aluminum oxide such as Al2O3, a tungsten oxide such as 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) Oxides such as 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, CoO), iron oxide (eg Fe2O3 or Fe3O4), niobium oxide (eg Nb2O5), indium tin oxide (eg ITO), indium zinc oxide (eg Indium Zinc Oxide, IZO) 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 guest-host liquid crystal layer 250 is disposed between the first electrode 230 and the second electrode 240. The guest-host liquid crystal layer (GHLC) 250 includes liquid crystals 251, dichroic dyes 252, a first orientation layer 253, a second orientation layer 254, and spacers 255. Here, the guest of the guest-host liquid crystal layer 250 may be dichroic dyes 252, and the host may be liquid crystals 251.

The liquid crystals 251 may be positive liquid crystals. The long axis of the positive liquid crystal may be arranged in the vertical direction (Z-axis direction) by a vertical electric field when a voltage is applied to the first electrode 230 and the second electrode 240, respectively.

When the difference between the voltage applied to the first electrode 230 and the voltage applied to the second electrode 240 is greater than the first reference voltage, the vertical electric field is applied to the first electrode 230 arranged in the vertical direction And the second electrode 240. In this case, That is, when the first voltage is applied to the first electrode 230 and the second voltage is applied to the second electrode 240, the long axis direction of the liquid crystals 251 and the dichroic dyes 252 is vertical Z-axis direction).

The dichroic dyes 252 may be dyes that absorb light. For example, the dichroic dyes 252 absorb black dyes that absorb all light in the visible light wavelength range, or light other than a specific color (e.g., red) wavelength band and emit light of a specific color (for example, red) Lt; RTI ID = 0.0 > light. ≪ / RTI > In the daytime mode, the dichroic dyes 252 are preferably black dyes, but not limited thereto, in order to increase the shading ratio for shielding external light. The dichroic dye 252 may be a dye having a color and may have any one of black, red, green, blue and yellow, And may have a color of mixing. Further, when the liquid crystals 251 are positive liquid crystals, the dichroic dyes 252 may have the property of a positive liquid crystal. That is, the dichroic dyes 252 are arranged in the vertical direction (Z-axis direction) by a vertical electric field when voltages are applied to the first electrode 230 and the second electrode 240, like the liquid crystals 251 .

The dichroic dyes 252 may be, but are not limited to, materials comprising aluminum zinc oxide (e.g., Aluminum Zinc Oxide, AZO). The dichroic dyes 252 may be included in the guest-host liquid crystal layer 250 at 0.5 wt% to 1.5 wt% when the cell gap of the guest-host liquid crystal layer 250 is 5 탆 to 15 탆. However, when the shading rate of the dichroic dyes 252 is very high, the amount of the dichroic dyes 252 may be less than 0.5 wt% in the guest-host liquid crystal layer 250, in which case the dichroic dyes 252 ) Can be reduced to 0.1 wt%. Alternatively, when the cell gap of the guest-host liquid crystal layer 250 is small, more dichroic dyes 252 should be contained in an amount greater than 1.5 wt% to improve the shading ratio. Therefore, when the cell gap is smaller than 5 mu m, the dichroic dyes 252 can be contained up to 3 wt%.

The amount of the dichroic dyes 252 included in the guest-host liquid crystal layer 252 is small and the dichroic dyes 252 absorb the incident light, so that the dichroic dyes 252 have a predetermined refractive index, The dyes 252 hardly contribute to refracting the incident light.

The first alignment film 253 is provided on one side of the first electrode 230 facing the second base film 220 and on the spacers 255. The second alignment layer 254 is provided on one surface of the second electrode 240 facing the first base film 210. The first and second alignment layers 253 and 254 are formed so that the long axes of the liquid crystals 251 and the dichroic dyes 252 are aligned in the horizontal direction (Y-axis direction).

Accordingly, when no voltage is applied to the first and second electrodes 230 and 240, the liquid crystal molecules 251 are aligned in the horizontal direction (Y-axis direction) by the first and second alignment films 253 and 254, Direction). The long axis direction of the dichroic dyes 252 may be aligned in the horizontal direction by the first and second alignment films 253 and 254 even if no voltage is applied to the first and second electrodes 230 and 240 like the liquid crystal 251. [ (Y-axis direction).

The spacers 255 are for maintaining the cell gap of the guest-host liquid crystal layer 250. Host liquid crystal layer 250 can be protected when a force is applied from the outside because the spacers 255 are provided so that the first and second electrodes 230 and 240 are short- ) Can be prevented. The spacers 255 may serve as barrier ribs for partitioning the guest-host liquid crystal layer 250. At this time, the same amount of liquid crystals 251 and dichroic dyes 252 may be included in each divided space.

The spacers 255 may be formed of any one of a transparent photo resist, polydimethylsiloxane, a polymer, and a UV curable polymer capable of transmitting light. It is not limited.

When the light control film 200 according to the embodiment of the present invention is applied to an organic light emitting display, it can be driven in a day mode and a night mode. The light control film 200 may be a light shielding mode for shielding external light in the daytime mode. The night mode may be a transmissive mode for transmitting light emitted from the organic light emitting element.

When the light control film 200 is driven in the daytime mode, the long axis direction of the liquid crystals 251 and the dichroic dyes 252 are aligned in the horizontal direction (Y-axis direction) by the first and second alignment films 253 and 254 ). ≪ / RTI > In this case, no voltage may be applied to the first and second electrodes 230 and 240. When the long axes of the liquid crystals 251 and the dichroic dyes 252 are arranged in the horizontal direction (Y-axis direction), the dichroic dyes 252 can absorb external light incident from the outside. Thus, deterioration of the visibility of the display panel due to external light can be prevented.

When the light control film 200 is driven in the night mode, as the voltage is applied to the first and second electrodes 230 and 240, the long axis direction of the liquid crystals 251 and the dichroic dyes 252 is vertical Direction (Z-axis direction). The liquid crystals 251 and the dichroic dyes 252 transmit light emitted from the organic light emitting element 252 when the long axes of the liquid crystals 251 and the dichroic dyes 252 are arranged in the vertical direction .

In the conventional organic light emitting display, functional films such as polarizing films are attached to the organic light emitting display panel to prevent deterioration of visibility of the organic light emitting display panel due to reflection of external light. However, when the functional films are attached to the organic light emitting display panel, the transmittance of light emitted from the organic light emitting element by the functional films may be lowered. When the light transmittance is lowered, the luminance of the organic light emitting display device may be lowered. Therefore, high power consumption is required to realize an appropriate luminance.

However, in the embodiment of the present invention, the light control film 200 is disposed on the organic light emitting display panel 100, and is driven in a daytime mode (light shielding mode) in which external light is blocked during a day when the light is highly influenced by external light, In nighttime where there is little outside light, it is driven in night mode (transmission mode) to increase light transmittance. Accordingly, when driving in the daytime mode, external light can be effectively blocked, and when driven in the nighttime mode, the light transmittance can be improved and the power consumption can be reduced.

A detailed description of the case where the light control film 200 is driven in the daytime mode and the nighttime mode will be described later with reference to FIGS. 6 and 7. FIG.

6 is an exemplary view showing an organic light emitting display according to an embodiment of the present invention in a day mode. This is an example for explaining that the external light L1 is cut off by the light control film 200 when the organic light emitting display device of the present invention described with reference to Figs. 1 to 5 is driven in the daytime. Therefore, the same reference numerals are assigned to the same components, and repetitive descriptions of the repetitive portions in the materials, structures, etc. of the respective components are omitted.

Referring to FIG. 6, the OLED display includes an OLED display panel 100, a retardation film 300, and a light control film 200. A phase retardation film 300 is disposed on the organic light emitting display panel 100 and a light control film 200 is disposed on the phase retardation film 300.

When driving the organic light emitting display device in the daytime, the light control film 200 may be implemented as a light shielding mode for shielding reflection of external light. In this case, even if no voltage is applied to the first and second electrodes 230 and 240, the liquid crystal 251 and the dichroic dyes 252 in the long axis direction of the light control film 200, (Y-axis direction) by the grooves 253, 254.

First, the external light L1 incident on the light control film 200 may include a horizontal light HL1 and a vertical light VL1. The horizontal light HL1 may be incident on the long axis of the dichroic dyes 252 arranged in the horizontal direction (Y-axis direction). In this case, the horizontal light HL1 can be mostly absorbed by the dichroic dyes 252. [ On the other hand, the vertical light VL1 can transmit the liquid crystals 251 and the dichroic dyes 252. That is, the vertical light VL1 may pass through the liquid crystal 251 and travel in the direction of the phase retardation film 300. In addition, the vertical light VL1 may be incident on the short axis perpendicular to the long axis of the dichroic dyes 252. [ In this case, since the short axis of the dichroic dyes 252 is short in comparison with the long axis of the dichroic dyes 252, the vertical light VL1 is transmitted completely without being absorbed by the dichroic dyes 252 And may proceed in the direction of the phase retardation film 300.

Next, the vertical light VL1 transmitted to the phase delay film 300 passes through the phase retardation film 300 and is converted into right circularly polarized light RCL1. Herein, the right circularly polarized light RCL1 means a circularly polarized light rotating clockwise. In this case, the retardation film 300 may be a lambda / 4 retardation film. The right circularly polarized light RCL1 is incident on the organic light emitting display panel 100.

The right circularly polarized light RCL1 incident on the organic light emitting display panel 100 is reflected by the electrodes (for example, a gate electrode, a source electrode, and a drain electrode) disposed inside the organic light emitting display panel 100, And is converted into the polarized light LCL1. Here, the left-handed circularly polarized light LCL1 means a circularly polarized light rotating counter-clockwise. The left-handed circularly polarized light LCL1 is incident on the phase-retarding film 300 again.

Then, the left-handed circularly polarized light LCL1 incident on the phase-delayed film 300 passes through the phase-delayed film 300 and is converted into a horizontal light HL2.

Finally, the horizontal light HL2 is incident on the light control film 200. In this case, the horizontal light HL2 is incident on the long axis of the dichroic dyes 252 arranged in the horizontal direction (Y-axis direction), and is absorbed by the dichroic dyes 252.

As described above, the external light L1 incident on the organic light emitting display in the daytime mode can be absorbed by the dichroic dye 252 provided on the light control film 200. [ Accordingly, since the embodiment of the present invention can cut off external light in the daytime mode, deterioration of the visibility of the display panel due to external light can be prevented.

On the other hand, the light L2 emitted from the organic light emitting element in the daytime mode can transmit the phase retardation film 300 and the light control film 200. In this case, since the dichroic dyes 252 of the light control film 200 are arranged in the horizontal direction (Y-axis direction), the horizontal light HL3 of the light L2 emitted from the organic light- And the vertical light VL2 can be emitted to the outside through the short axis of the liquid crystals 251 and the dichroic dyes 252. [

7 is an exemplary view showing an organic light emitting diode display according to an embodiment of the present invention in a night mode. This is an example for explaining that light emitted from the organic light emitting device is transmitted by the light control film when the organic light emitting display device of the present invention described with reference to Figs. 1 to 5 is driven in the night mode. Therefore, the same reference numerals are assigned to the same components, and repetitive descriptions of the repetitive portions in the materials, structures, etc. of the respective components are omitted.

7, when driving the organic light emitting display device in the night mode, the light control film 200 may be implemented as a transmission mode for transmitting the light L3 emitted from the organic light emitting display panel 100 . In this case, the long axis direction of the liquid crystals 251 and the dichroic dyes 252 of the light control film 200 may be arranged in the vertical direction (Z-axis direction).

In the case where the liquid crystals 251 and the dichroic dyes 252 have the property of positive liquid crystal so that the long axis direction of the liquid crystals 251 and the dichroic dyes 252 are arranged in the vertical direction (Z axis direction) A vertical electric field must be applied to the host liquid crystal layer 250; Accordingly, different voltages may be applied to the first electrode 230 and the second electrode 240, respectively.

The light L3 emitted from the organic light emitting display panel 100 may be incident on the light control film 200 through the phase retardation film 300. In this case, In this case, since the dichroic dyes 252 are arranged in the vertical direction (Z-axis direction), light L3 emitted from the organic light emitting display panel 100 is not absorbed by the dichroic dyes 252 , And is emitted to the outside.

Accordingly, the embodiment of the present invention can improve the transmittance of the light L3 emitted from the organic light emitting display panel 100 in the night mode. In this case, the light transmittance may be 60% to 80%. That is, since the light control film 200 according to the embodiment of the present invention is driven in the night mode (transmission mode) at night, which is not affected by external light, the transmittance of light emitted from the organic light emitting display panel can be improved. Since the embodiment of the present invention improves the light transmittance when driven in the night mode, it is possible to increase the luminance of the organic light emitting display device without increasing the power consumption.

On the other hand, the external light L4 is incident on the light control film 200 in the night mode. In this case, since the dichroic dyes 252 are arranged in the vertical direction (Z-axis direction), the external light L4 is not absorbed by the dichroic dyes 252 and passes through the phase retardation film 300 as it is . The light passing through the retardation film 300 is reflected by the organic light emitting display panel 100 and passes through the retardation film 300 and the light control film 200 and is emitted to the outside. Accordingly, in the night mode, the OLED display according to the present invention can not have a function of blocking external light. However, in the case of the night mode, since there is almost no external light incident on the OLED display device, the external light does not affect the visibility of the display panel. Therefore, in the night mode, the light control film 200 according to the embodiment of the present invention can only function to transmit light emitted from the organic light emitting display panel.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of. Therefore, the scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention.

100: organic light emitting 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 230: first electrode
240: second electrode 250: guest-host liquid crystal layer
251: liquid crystal 252: dichroic dye
253: first orientation film 254: second orientation film
255: Spacer 300: Phase retardation film

Claims (10)

An organic light emitting display panel including a thin film transistor and an organic light emitting element electrically connected to the thin film transistor;
A phase retardation film disposed on the organic light emitting display panel; And
And a light control film disposed on the phase delay film,
The light control film may include a light-
A first base film and a second base film facing each other;
A first electrode disposed on one surface of the first base film facing the second base film;
A second electrode disposed on one surface of the second base film facing the first base film; And
And a guest-host liquid crystal layer disposed between the first electrode and the second electrode, the guest-host liquid crystal layer including liquid crystals and dichroic dyes. The method according to claim 1,
Wherein the liquid crystals are positive liquid crystals. The method according to claim 1,
Wherein a vertical electric field is applied to the liquid crystals and the dichroic dyes when a first voltage is applied to the first electrode and a second voltage is applied to the second electrode. The method of claim 3,
And the long axes of the liquid crystals and the dichroic dyes are arranged in the vertical direction by the vertical electric field. The method of claim 3,
Wherein the guest host liquid crystal layer is implemented in a transmission mode for transmitting light emitted from the organic light emitting display panel by the vertical electric field. The method according to claim 1,
A first alignment layer provided on the first electrode; And
And a second alignment layer provided on the second electrode and arranged to face the first alignment layer,
Wherein the liquid crystals and the dichroic dyes are provided between the first alignment layer and the second alignment layer. The method according to claim 6,
Wherein the first alignment layer and the second alignment layer are horizontal alignment layers that align the liquid crystals and the dichroic dyes in a horizontal direction when no voltage is applied to the first electrode and the second electrode. 8. The method of claim 7,
Wherein the guest host liquid crystal layer is implemented in a shading mode for shielding external light incident from the outside when the liquid crystals and the dichroic dyes are arranged in the horizontal direction. The method according to claim 1,
Wherein the phase retardation film is a lambda / 4 phase retardation film. The method according to claim 1,
And a spacer provided on the first electrode and holding a cell gap between the first electrode and the second electrode.

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