WO2021107404A1 - Polarizer, polarizer manufacturing method, and display device having same - Google Patents

Abstract

A polarizer according to the present invention is composed of a supramolecular structure comprising a discotic liquid crystal molecule of Chemical Formula 1 and a fluorenone derivative of Chemical Formula 2, wherein the supramolecular structure is characterized in that a plurality of the discotic liquid crystal molecules and the fluorenone derivatives are alternately arranged with each other along a first direction to form a long axis. [Chemical Formula 1] wherein R is C6H11, C6H13 and C8H17. [Chemical Formula 2] wherein substituents M and N are both NO2, M is H and N is HO2, or both M and N are H.

Description

Polarizer, polarizer manufacturing method, and display device having same

The present invention relates to a polarizer, a method for manufacturing a polarizer, and a display device having the same, and more particularly, to a coating-type polarizer capable of absorbing a wide visible light region and strong against moisture, a polarizer manufacturing method, and a display device having the same.

The polarizing plate absorbs light components vibrating in one direction and transmits light vibrating only in the other axis direction, thereby causing natural light to vibrate in only one direction.

Such a polarizing plate is applied to a display device such as a liquid crystal display device and an organic light emitting display device to realize an image by controlling the transmittance of light passing through the display device (liquid crystal display device) or to block the reflection of external light input from the outside to display the display device to improve the visibility (organic light emitting display device).

Since the polarizing plate is manufactured as a structure separate from the display panel and attached to both sides or the front surface of the display panel, it is a major cause of an increase in the volume and weight of the display device when manufacturing the display device.

In addition, such a polarizing plate is not only an expensive component, but also has a problem in that the manufacturing process is complicated because the polarizing plate must be attached to both sides or the front side of the display panel in a module process separate from the manufacturing process of the display panel.

An object of the present invention is to provide a polarizer having good polarization characteristics in the entire visible light band and strong resistance to moisture and temperature, and a method for manufacturing the same in order to solve the above problems.

Another object of the present invention is to provide a display device including the polarizer.

In order to achieve the above object, a polarizer according to the present invention is composed of a supramolecular structure including a discotic liquid crystal molecule of Formula 1 and a fluorenone derivative of Formula 2, and the supramolecular structure includes a plurality of discotic liquid crystal molecules and a flow It is characterized in that the lenone derivatives are alternately arranged with each other along the first direction to form a long axis.

[Formula 1]

where R is C ₆ H ₁₁ , C ₆ H ₁₃ and C ₈ H ₁₇

[Formula 2]

Here, the substituents M and N are both NO ₂ , M is H and N is HO ₂ , or both M and M are H.

When the substituents M and N are both NO ₂ , the fluorenone derivative is 2,4,7-Trinitro-9-Fluorenone, and when M is H and N is HO ₂ , the fluorenone derivative is 2,4-Dinitro-9-Fluorenone and when M and M are both H, the fluorenone derivative is 2-Nitro-9-Fluorenone.

The supramolecular structure absorbs light vibrating in a direction parallel to the long axis.

The polarizer includes a support on which a supramolecular structure is applied, and an alkyl group is substituted on the support to alternately arrange the discotic liquid crystal molecules and the fluorenone derivative in a first direction.

In addition, the method for manufacturing a polarizer according to the present invention comprises the steps of mixing a discotic liquid crystal molecule of Formula 1 and a fluorenone derivative of Formula 2 to form a supramolecular structure; dropping a mixture of the discotic liquid crystal molecule and the fluorenone derivative onto a support substituted with an alkyl group on a predetermined region; and the discotic liquid crystal molecules along a first direction perpendicular to the second direction by applying a mixture of the discotic liquid crystal molecules and the fluorenone derivatives to the support by moving the blade along the second direction according to the liquid phase shearing method and alternatingly arranging a mixture of the fluorenone derivative.

[Formula 1]

where R is C ₆ H ₁₁ , C ₆ H ₁₃ and C ₈ H _{17 .}

[Formula 2]

Here, the substituents M and N are both NO ₂ , M is H and N is HO ₂ , or both M and M are H.

The mixing of the discotic liquid crystal molecule and the fluorenone derivative may include: mixing the discotic liquid crystal molecule and the fluorenone derivative in a 1:1 molar ratio; and stirring the mixed discotic liquid crystal molecules and the fluorenone derivative at a temperature of 60° C. for 2 hours. The step of applying the mixture of the discotic liquid crystal molecules and the fluorenone derivative to the support is 70° C. and applying a mixture of discotic liquid crystal molecules and the fluorenone derivative to the support by moving the blade of the blade at a shear rate of 10-20 μm/s in the second direction.

In addition, the display device according to the present invention includes a display panel that implements an image and a polarizing layer formed on at least one side of the display panel. In this case, the display device may include an organic light emitting display panel and a liquid crystal display panel.

In the present invention, since the polarizer can be formed by applying the supramolecular structure to the display device by a coating process after making the supramolecular structure, it is possible to shorten the manufacturing process time of the polarizer and reduce the manufacturing cost.

In addition, since the supramolecular structure is configured in-line with the manufacturing process of the display device, the display panel and the polarizer can be formed by a continuous series of processes, which greatly simplifies the manufacturing process and reduces the manufacturing time of the display device. can be shortened, greatly reducing the manufacturing cost of the display device and improving the yield.

Furthermore, since the polarization layer applied to the display device can be formed very thinly in the form of a thin film, a thin display device can be manufactured.

1 is a circuit diagram conceptually illustrating one pixel of an organic light emitting display device according to the present invention.

2 is a cross-sectional view specifically illustrating one pixel of an organic light emitting display device according to the present invention.

3 is a view showing the arrangement of the supramolecular structure.

4 is a view showing a polarizer in which supramolecular structures are arranged.

5 is a graph showing the light absorption by wavelength of the supramolecular structure according to the present invention.

6 is a flowchart illustrating a method for manufacturing a polarizer according to the present invention.

7A to 7D are diagrams illustrating an actual manufacturing method of a polarizer according to the present invention.

8 is a graph showing total transmittance and degree of polarization of the polarizer according to the present invention.

9 is a flowchart illustrating a method of manufacturing a display device according to the present invention.

10A and 10B are cross-sectional views specifically illustrating one pixel of the liquid crystal display according to the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be embodied in various different forms, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the scope of the rights of the present invention should be determined by the appended claims.

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

The present invention provides a coated polarizer. Coated-type polarizer is formed by applying directly to the front surface or inner substrate of the display device, so it is composed of a polyvinyl alcohol (PVA)-based resin film and a cellulose acetate-based polarizer protective film represented by cetyl cellulose (TAC). Compared to a general polarizing plate that is configured in a film form and attached to a display device, it is easy to manufacture and can be reduced in thickness. In addition, since there is no need for a separate stretching process or dyeing process, the process time is shortened and the manufacturing cost is reduced.

In particular, the present invention provides a coating-type polarizer that is resistant to heat and absorbs light in a wide wavelength band, that is, a visible light wavelength band, and thus can be excellently applied to a display device.

Hereinafter, a display device equipped with such a coated polarizer will be described in detail.

1 is a circuit diagram conceptually illustrating one pixel of an organic light emitting display device according to the present invention.

As shown in FIG. 1 , the organic light emitting display device according to the present invention includes a gate line GL, a data line DL, and a power line PL that cross each other to define a pixel P, and the pixel A switching thin film transistor (Ts), a driving thin film transistor (Td), a storage capacitor (Cst) and an organic light emitting device (D) are disposed in (P).

The switching thin film transistor Ts is connected to the gate line GL and the data line DL, and the driving thin film transistor Td and the storage capacitor Cst are connected between the switching thin film transistor Ts and the power line PL. connected, and the organic light emitting diode (D) is connected to the driving thin film transistor (Td).

In the organic light emitting display panel having such a structure, when the switching thin film transistor Ts is turned on according to the gate signal applied to the gate line GL, the data signal applied to the data line DL is It is applied to the gate electrode of the driving thin film transistor Td and one electrode of the storage capacitor Cst through the switching thin film transistor Ts.

The driving thin film transistor Td is turned on according to the data signal applied to the gate electrode, and as a result, a current proportional to the data signal is generated from the power wiring PL through the driving thin film transistor Td to the organic light emitting diode D ), and the organic light emitting device D emits light with a luminance proportional to the current flowing through the driving thin film transistor Td.

At this time, the storage capacitor Cst is charged with a voltage proportional to the data signal, so that the voltage of the gate electrode of the driving thin film transistor Td is constantly maintained for one frame.

2 is a cross-sectional view illustrating an actual structure of one pixel of an organic light emitting display panel according to an exemplary embodiment of the present invention.

As shown in FIG. 2 , a buffer layer 112 is formed on the first substrate 110 , and a driving thin film transistor is disposed thereon. The substrate 110 may be made of a transparent material such as glass or a transparent and flexible plastic such as polyimide. Also, the buffer layer 112 may be formed of a single layer or a plurality of layers made of an inorganic material such as SiOx or SiNx.

The driving thin film transistor is formed in each of the plurality of pixels. The driving thin film transistor includes a semiconductor layer 122 formed in a pixel on the buffer layer 112 , a gate insulating layer 123 formed in a partial region of the semiconductor layer 122 , and a gate insulating layer 123 formed on the gate insulating layer 123 . Through the gate electrode 125 , the interlayer insulating layer 114 formed over the entire substrate 110 to cover the gate electrode 125 , and the first contact hole 114a formed in the interlayer insulating layer 114 . It includes a source electrode 127 and a drain electrode 128 in contact with the semiconductor layer 122 .

In addition, although not shown in the drawings, a switching thin film transistor is disposed on the first substrate 110 . In this case, the switching thin film transistor may have the same structure as the driving thin film transistor.

The semiconductor layer 122 may be formed of crystalline silicon or an oxide semiconductor such as IGZO (Indium Gallium Zinc Oxide), and includes a channel layer in the central region and doped layers on both sides of the source electrode 127 and the drain electrode 128 . ) is in contact with the doped layer.

The gate electrode 125 may be formed of a metal such as Cr, Mo, Ta, Cu, Ti, Al or Al alloy, and the gate insulating layer 123 and the interlayer insulating layer 114 may be formed of SiO _x or SiNx. It may be made of a single layer made of an inorganic insulating material or an inorganic layer having a two-layer structure of _{SiO x and SiNx.} In addition, the source electrode 127 and the drain electrode 128 may be formed of Cr, Mo, Ta, Cu, Ti, Al, or an Al alloy.

In addition, although the driving thin film transistor has a specific structure in the drawings and the above description, the driving thin film transistor of the present invention is not limited to the illustrated structure, and any driving thin film transistor of any structure may be applied.

A protective layer 116 is formed on the substrate 110 on which the driving thin film transistor is formed. The protective layer 116 may be formed of an organic material such as photoacrylic, but may also include a plurality of layers including an inorganic layer and an organic layer. A second contact hole 116a is formed in the protective layer 116 .

A first electrode 130 electrically connected to the drain electrode 128 of the driving thin film transistor through a second contact hole 116a is formed on the protective layer 116 . In addition, the first electrode 130 is made of a single layer or a plurality of layers made of a metal such as Ca, Ba, Mg, Al, Ag, or an alloy thereof, and is connected to the drain electrode 128 of the driving thin film transistor from the outside. An image signal is applied.

A first bank layer 142 and a second bank layer 144 are formed at the boundary of each pixel P on the passivation layer 116 . The first bank layer 142 and the second bank layer 144 are a kind of barrier ribs, and by dividing each pixel P, light of a specific color output from adjacent pixels can be prevented from being mixed and output. In the drawing, the first bank layer 142 is formed on the protective layer 116 and the second bank layer 144 is formed on the first bank layer 142 , but the first bank layer 142 is formed on the first electrode. It may be formed over 130 . Also, the first electrode 130 may extend to side surfaces of the first bank layer 142 and the second bank layer 144 .

An organic light emitting layer 132 is formed on the first electrode 130 and the bank layers 142 and 144 . The organic light-emitting layer 132 may be an R-organic light-emitting layer formed in the R, G, and B pixels to emit red light, a G-organic light-emitting layer to emit green light, and a B-organic light-emitting layer to emit blue light.

In the organic light emitting layer 132, not only the light emitting layer, but also an electron injection layer and a hole injection layer for respectively injecting electrons and holes into the light emitting layer, and an electron transport layer and a hole transport layer for respectively transporting the injected electrons and holes to the organic layer, etc. may be formed.

The organic light emitting layer 132 may be formed by thermal evaporation of an organic light emitting material, or may be formed by coating an organic light emitting material in a solution state on the first electrode 130 and drying the organic light emitting material.

A second electrode 134 is formed on the organic light emitting layer 132 . The second electrode 134 may be made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) or a thin metal through which visible light is transmitted, but is not limited thereto.

An adhesive layer 162 is applied on the second electrode 134 , and a second substrate 160 is disposed on the adhesive layer 162 , so that the second substrate 160 is attached to the display panel. As the adhesive layer, any material may be used as long as it has good adhesion and good heat resistance and water resistance, but in the present invention, a thermosetting resin such as an epoxy-based compound, an acrylate-based compound, or an acrylic rubber may be used. In addition, a photocurable resin may be used as the adhesive, and in this case, the adhesive layer 162 is cured by irradiating the adhesive layer with light such as ultraviolet rays.

The adhesive layer 162 may serve as an encapsulant for not only bonding the first substrate 110 and the second substrate 160 to each other, but also preventing moisture from penetrating into the electroluminescent display panel. Accordingly, in the detailed description of the present invention, the term of reference numeral 162 is expressed as an adhesive, but this is for convenience, and the adhesive layer may be referred to as an encapsulant.

The second substrate 160 is an encapsulation cap for encapsulating the electroluminescent display panel, such as a polystyrene (PS) film, a polyethylene (PE) film, a polyethylene naphthalate (PEN) film, or a polyimide (PI) film. A protective film may be used, or glass may be used.

Although not shown in the drawings, a planarization layer may be formed between the second electrode 134 and the adhesive layer 162 . In this case, the planarization layer may be composed of an organic layer, and may be composed of a plurality of layers composed of an inorganic layer and an organic layer. For example, SiOx and SiNx may be used as the inorganic layer, and photoacrylic may be used as the organic layer, but is not limited thereto.

In addition, a separate encapsulation layer may be formed between the second electrode 134 and the adhesive layer 162 . In this case, the encapsulation layer may include at least one inorganic layer and at least one organic layer.

The first electrode 130 , the organic light emitting layer 132 , and the second electrode 134 form an organic light emitting diode.

When the first electrode 130 is a cathode of the organic light emitting diode and the second electrode 134 is an anode, voltage is applied to the first electrode 130 and the second electrode 134, Electrons from the first electrode 130 are injected into the organic light emitting layer 132 and holes are injected from the second electrode 134 into the organic light emitting layer 132, and excitons are generated in the organic light emitting layer 132, , as these excitons decay, light corresponding to the energy difference between the Lowest Unoccupied Molecular Orbital (LUMO) and the Highest Occupied Molecular Orbital (HOMO) of the emission layer is generated and emitted to the outside (the second substrate 160 side). will do

In addition, in the organic light emitting device, the first electrode 130 is made of a transparent conductive material such as ITO or IZO or a thin metal through which visible light is transmitted, and the second electrode 134 is formed of Ca, Ba, Mg, Al, A single layer or a plurality of layers made of a metal such as Ag or an alloy thereof, light generated from the organic light emitting layer 132 may be emitted in a downward direction (first substrate 110 side).

In addition, in the organic light emitting device, the first electrode 130 is made of a metal and the second electrode 134 is made of a transparent conductive material or a thin metal through which visible light is transmitted. It may radiate in the upper direction (second substrate 160 side).

In the organic light emitting display panel of the present invention, the structure as described above may be applied to various organic light emitting devices currently known as well as organic light emitting devices.

In the organic light emitting display panel having such a structure, each pixel is partitioned by a bank layer, and an organic light emitting device including an R-organic light emitting layer, a G- organic light emitting layer, and a B- organic light emitting layer is disposed in each pixel.

In addition, in the present invention, the bank layer dividing the pixel is composed of a double layer of the first bank layer 142 and the second bank layer 144 thereon. In this case, the first bank layer 142 may be formed of a hydrophilic material and the second bank layer 144 may be formed of a hydrophobic material. The width of the first bank layer 142 is formed to be greater than the width of the second bank layer 144, so that the first bank layer 142 is exposed on both sides of the second bank layer 144, and the organic light emitting layer 132 is exposed. It is formed on the first electrode 130 and the exposed first bank layer 142 .

In addition, the width of the first bank layer 142 is the same as the width of the second bank layer 144, and the first bank layer 142 and the second bank layer 144 are aligned and formed. The organic light emitting layer 132 may be formed only on the first electrode 130 .

A phase delay layer 166 and a polarization layer 170 are formed on a lower surface of the first substrate 110 . The external light input from the outside of the polarization layer 170 is changed to linearly polarized light in a specific direction, and the phase delay layer 166 delays the λ/4 phase of the linearly polarized light from the polarization layer 170 . converted into circularly polarized light.

When the light emitted from the organic light emitting layer 132 is emitted in the upper direction, that is, toward the second substrate 160 , the phase delay layer 166 and the polarization layer 170 are formed on the upper surface of the second substrate 160 .

Light input from the outside and converted into, for example, left circularly polarized light by the polarization layer 170 and the phase delay layer 166 is reflected by the second substrate 160 or a structure below it and is then right circularly polarized light , and the right circularly polarized light is blocked without passing through the polarization layer 170 and the phase delay layer 166 , so that the reflected light from the display panel can be blocked.

In addition, the light emitted from the organic light emitting layer 132 to the outside is linearly polarized and output while passing through the phase delay layer 166 and the polarization layer 170 .

The phase delay layer 166 may be formed by being applied to the first substrate 110 or the second substrate 160, or may be formed and attached in the form of a film. In this case, the phase delay layer 166 includes polyether sulfone (PES), tri-acetyl cellulose (TAC), polycarbonate (PC), and polyethylene terephthalate. :PET) and cyclo olefin polymer (COP) may be used, but the present invention is not limited thereto.

The polarization layer 170 may be formed by being applied to the phase delay layer 166). The polarization layer 170 is made of a coating-type polarizing material, and is formed by being applied to the phase delay layer 166 . Hereinafter, the coating-type polarizer forming the polarization layer 170 will be described in more detail.

3 is a view showing the supramolecular structure 272 formed by the charge transfer complex of the polarizer 270 according to the present invention, and FIG. 4 is a view showing the polarizer 270 in which the charge transfer complex is aligned.

3 and 4, in the polarizer 270 according to the present invention, discotic liquid crystal molecules 272a and 9-Fluorenone derivatives 272b are alternately arranged along one direction. It is composed of a supramolecular structure (272).

The discotic liquid crystal molecule 272a may be expressed by the following Chemical Formula 1.

[Formula 1]

As shown in Formula 1, the discotic liquid crystal molecule 272a has a triphenylene central molecule in which six alkoxy groups are substituted, and R is substituted in the alkoxy group. _{In this case, the substituent R may be C 6} H ₁₁ , C ₆ H ₁₃ and C ₈ H ₁₇ depending on the absorption wavelength in the supramolecular structure formed by the charge transfer complex, but is not limited thereto.

In addition, the fluorenone derivative 272b may be represented by the following Chemical Formula 2.

[Formula 2]

Here, both of the substituents M and N may be NO ₂ , M may be H and N may be HO ₂ , and both M and M may be H.

As shown in Formula 2, in the fluorenone derivative 272b, 1 to 3 nitro groups are substituted in the fluorenone molecular sieve. When the substituents M and N are both NO ₂ , the fluorenone derivative 272b is 2,4,7-Trinitro-9-Fluorenone, M is H and N is HO _{2 When the} fluorenone derivative 272b is 2,4 -Dinitro-9-Fluorenone, and when M and M are both H, the fluorenone derivative (272b) is 2-Nitro-9-Fluorenone.

By adjusting these substituents, the wavelength of the supramolecular structure 272 formed by the charge transfer complex can be adjusted.

The discotic liquid crystal molecules 272a and the fluorenone derivative 272b form a charge transfer complex. When the discotic liquid crystal molecule 272a and the fluorenone derivative 272b are mixed at a set temperature for a set time, six alkoxy groups that are donors of the discotic liquid crystal molecule 272a transfer electrons to the triphenyline group. The molecular center of the discotic liquid crystal molecules 272a forms a relatively high electron density.

On the other hand, in the fluorenone derivative 272b, electrons of the fluorenone molecular sieve are transferred to 1 to 3 nitro groups that are acceptors, so that a relatively low electron density is formed in the molecular center of the fluorenone derivative 272b. .

Therefore, the electron-rich discotic liquid crystal molecule 272a acts as an electron donor and the fluorenone derivative 272b acts as an electron acceptor. The discotic liquid crystal molecules 272a and the fluorenone derivative 272b form an electron transfer complex by electrostatic attraction by

In the present invention, as described above, the supramolecular structure 272 is formed by an electron transfer complex by electrostatic attraction between the discotic liquid crystal molecules 272a and the fluorenone derivative 272b, and the supramolecular structure 272 is a discotic liquid crystal. An electron transfer path is formed between the molecule 272a and the fluorenone derivative 272b, and light energy is absorbed when electrons are excited in the electron transfer path. In particular, in the supramolecular structure 272 according to the present invention, when electrons are excited in the electron movement path, light in the visible ray region of about 400-700 nm wavelength is absorbed.

5 is a view showing the light absorptivity for each wavelength of the supramolecular structure 272 according to the present invention, wherein the dashed-dotted line represents the light absorptivity of the fluorenone derivative 272b, and the double-dotted line represents the light absorptivity of the discotic liquid crystal molecule 272a. and the solid line indicates the light absorption rate of the supramolecular structure 272 .

As shown in FIG. 5, in the visible light region of about 400-700 nm, the discotic liquid crystal molecule 272a has a light absorptivity of about 0.1 or less, and the fluorenone derivative 272b has a light absorptivity of about 0.6-0.65. However, the supramolecular structure 272 has a light absorptivity of about 0.4-1.2. Accordingly, it can be seen that the light absorptivity of the supramolecular structure 272 formed by the electron transfer complex is much greater than that of the discotic liquid crystal molecules 272a and the fluorenone derivative 272b.

In particular, the light absorptivity of the supramolecular structure 272 is much greater than that of the fluorenone derivative 272b over the entire visible light region except for the wavelength band of about 690-700 nm. Moreover, in the wavelength band of about 470-630 nm including the wavelength bands of R, G, and B colors, the light absorptivity of the supramolecular structure 272 is nearly twice as large as that of the fluorenone derivative 272b.

On the other hand, the fluorenone derivative (272b) described in Chemical Formula 2 is 2,4,7-Trinitro-9-Fluorenone, 2,4-Dinitro-, each having different light absorption rates depending on 1 to 3 substituents on the fluorenone molecular sieve. 9-Fluorenone, and 2-Nitro-9-Fluorenone, and the light absorptance of the supramolecular structure 272 also changes according to the change in the light absorptivity of the fluorenone derivative 272b.

Accordingly, in the present invention, not only can the light absorptance of the supramolecular structure 272 be adjusted according to the substituent of the fluorenone derivative 272b, but also the light absorptance for each wavelength band can be adjusted by changing the type of the substituent.

As described above, in the present invention, since the supramolecular structure 272 formed by the electron transfer complex of the discotic liquid crystal molecule 272a and the fluorenone derivative 272b absorbs light in the visible region, the supramolecular structure 272 It is possible to form a polarizer that absorbs a light component in a specific direction and transmits a light component in a different direction for the house ray.

In particular, as shown in Fig. 3, in the present invention, discotic liquid crystal molecules (272a) and fluorenone derivatives (272b) are alternately arranged along a specific direction to form a supramolecular structure 272, so that discotic liquid crystal molecules ( 272a) and the arrangement direction of the fluorenone derivative 272b, that is, a light component parallel to the long axis direction of the supramolecular structure 272 (that is, light vibrating in the long axis direction of the supramolecular structure 272) is absorbed and the supramolecular structure 272 ) (light vibrating in a direction perpendicular to the long axis direction of the supramolecular structure 272) is transmitted perpendicular to the long axis direction of the supramolecular structure 272 as a polarizer for polarizing light.

Hereinafter, a method of manufacturing the polarizer using the supramolecular structure 272 as described above will be described in detail.

6 is a flowchart illustrating a method for manufacturing a polarizer according to the present invention, and FIGS. 7A to 7D are diagrams specifically illustrating a method for actually manufacturing a polarizer according to the present invention.

First, as shown in FIG. 6, discotic liquid crystal molecules 272a and fluorenone derivatives 272b are added to 1,2-dichlorobenzene in a molar ratio of 1:1 and mixed to form a supramolecular structure 272. (S101). At this time, the discotic liquid crystal molecules 272a and the fluorenone derivative 272b are stirred at a temperature of about 60° C. for about 2 hours, but the present invention is not limited thereto, but depending on various conditions such as a substituent of the fluorenone derivative 272b. Stirring temperature and stirring time can be adjusted.

As described above, as the discotic liquid crystal molecules 272a and the fluorenone derivative 272b are stirred at the set temperature and time, the discotic liquid crystal molecules 272a and the fluorenone derivative 272b are charged by electrostatic force due to charge transfer. A mobile complex is formed to form the supramolecular structure 272 .

Subsequently, as shown in FIG. 7A , after preparing the support 274 , the surface of the support 274 is treated to substitute the alkyl group 276 on the surface of the support 274 ( S102 ). Substitution of the alkyl group 276 to the surface of the support 274 may be accomplished by various methods. For example, the treatment of the support 274 may be formed by applying a polymer having an alkyl group 276 to the surface of the support 274 , but is not limited thereto.

The support 274 may be made of glass or a transparent film. As the transparent film, a polymer film containing a polyvinyl alcohol (PVA)-based resin as a main component may be used, but is not limited thereto.

After that, the supramolecular structure 272c in a solution state is coated on the support 274 by a solution shearing process (S103), and then a polarizer is formed by curing the supramolecular structure 272c in a solution state. do.

That is, as shown in FIG. 7b, the supramolecular structure 272c in a solution state is dropped or applied to a specific region of the support 274, and the blade 277 is placed on the applied supramolecular structure 272c, and then the temperature set When the blade 277 is moved at a set speed along the shear direction of the first direction, the supramolecular structure 272 is combined with an alkyl group substituted on the support 274 to form a dipole formed in the supramolecular structure 272. Moments (δ ⁺ , δ ^- ) are arranged along one direction. Accordingly, the discotic liquid crystal molecules 272a and the fluorenone derivatives 272b are alternately arranged along one direction so that the supramolecular structure 272 is arranged along a specific direction.

At this time, in the solution shearing method, in a state in which the support 274 and the blade 277 are heated to about 70° C., the blade 277 is moved along the shearing direction (first direction) at a speed of about 10-20 μm/s. By doing so, the supramolecular structure 272 is applied over the entire support 274 .

7c and 7d, the supramolecular structure 272 applied to the support 274 by this solution shearing method is arranged along the first direction and the second direction perpendicular to the shearing direction. The polarizer is formed by curing the supramolecular structure 272c in the solution state as described above and removing the solvent.

When light transmits through the supramolecular structures 272 arranged along the first direction, light components horizontal to the first direction are absorbed and light perpendicular to the first direction is transmitted, so the light absorption axis of the manufactured polarizer is in the first direction. and the light transmission axis is formed along the second direction.

As described above, the polarizer according to the present invention is formed by stirring the discotic liquid crystal molecules 272a and the fluorenone derivative 272b to form the supramolecular structure 272, and then applying the same.

8 is a graph showing total transmittance and degree of polarization of the polarizer according to the present invention. In this case, the solid line represents the degree of polarization (DOP) and the dotted line represents the total transmittance (TT).

As shown in FIG. 8 , the manufactured polarizer has an average transmittance of about 40% or less as a whole in a wavelength band of about 400-700 nm, which is a visible ray region, and in particular, an average transmittance of about 20% in a wavelength band of 600 nm or less. Therefore, when such a polarizer is used in a display device, an image passes through the polarizer and reaches the user.

In addition, the manufactured polarizer exhibits a polarization efficiency of about 90.3% near 470 nm for a light component vibrating in the arrangement direction of the supramolecular structure 272, that is, in the long axis direction, and a polarization efficiency of about 85% in the visible light band of 400-700 nm. indicates

Therefore, the polarizer according to the present invention not only has good polarization degree, but also exhibits good polarization characteristics over a wide wavelength band of the entire household ray band, so that it can be usefully applied as a polarizing plate for a display device.

In addition, since the polarizer according to the present invention is strong against moisture, deformation does not occur by water vapor in the atmosphere, and the structure does not deform even at a high temperature of 150° C.

On the other hand, since the polarizer according to the present invention can be formed by directly coating the supramolecular structure 272 on the front surface or inner substrate of the display device during the process of the display device, it is easier to manufacture compared to a general polarizing plate. do. In addition, since there is no need for a separate stretching process or dyeing process, the process time is shortened and the manufacturing cost is reduced.

In particular, the present invention provides a coating-type polarizer that is resistant to heat and absorbs light in a wide wavelength band, that is, a visible light wavelength band, and thus can be excellently applied to a display device.

Further, in the present invention, since the polarizer can be manufactured by coating the supramolecular structure 272 in the form of a thin film, the thickness of the display device can be reduced.

9 is a flowchart schematically illustrating a method of manufacturing an organic light emitting display device according to the present invention, and with reference to this, a method of manufacturing an organic light emitting display device having a polarizer according to the present invention will be briefly described.

As shown in FIG. 9 , an organic light emitting display panel is first manufactured ( S201 ). In this case, the organic light emitting display panel has the structure shown in FIG. 2 , and a driving thin film transistor and an organic light emitting device are disposed on a first substrate 110 , and a second substrate 160 is provided thereon. In this case, the organic light emitting display panel is a bottom light emitting organic light emitting display panel, and the light emitted from the organic light emitting device is outputted to the outside through the first substrate 110 to display an image. Of course, the organic light emitting display panel of the present invention is not limited to such a structure, but may be applied to display panels having various structures currently known.

Thereafter, after mixing the discotic liquid crystal molecules 272a and the fluorenone derivative 272b in 1,2-dichlorobenzene, at a set temperature (for example, a temperature of about 60° C.) for a set time (for example, for about 2 hours) to form the supramolecular structure 272 in a solution state (S202).

Next, a polymer including an alkyl group is coated on the rear surface of the first substrate 110 of the manufactured organic light emitting display panel, that is, the outer surface of the first substrate 110 on which an image is displayed, to the surface of the first substrate 110 . is substituted with an alkyl group (S203).

After that, the solution-state supramolecular structure 272 is applied to the rear surface of the first substrate 110 by the solution shearing method, and then dried, the discotic liquid crystal molecules are located on the rear surface of the first substrate 110 along a specific direction. 272a and the fluorenone derivative 272b are alternately arranged so that the long axes of the supramolecular structure 272 are arranged along the direction to form the polarization layer 170 on the image display surface of the organic light emitting display device (S204) .

As described above, in the present invention, after making the supramolecular structure 272, by coating the supramolecular structure 272 on the display device by a coating process, a polarizer can be formed, so that the manufacturing process of the display device can be simplified. do.

Moreover, since the supramolecular structure 272 is configured in-line with the manufacturing process of the display device, the display panel and the polarizer can be formed by a continuous series of processes, which greatly simplifies the manufacturing process and improves the display device. It is possible to shorten the manufacturing time of the display device, greatly reducing the manufacturing cost of the display device and improving the yield.

On the other hand, the supramolecular structure 272 is formed by being coated on the rear surface of the first substrate 110 of the organic light emitting display panel, but the supramolecular structure 272 according to the present invention is applied only to the rear surface of the first substrate 110 . it is not When the display device is a top emission type organic light emitting display panel, the supramolecular structure 272 is applied to the upper surface of the second substrate 160 so that the polarization layer 170 can be formed on the upper surface of the second substrate 160 . have.

That is, the supramolecular structure 272 according to the present invention is applied to a desired area as needed, so that a polarizer having a desired shape can be formed in the corresponding area by a quick and simple method.

Also, in the above description, an organic light emitting display device has been described as an example of a display device to which the polarizer of the present invention is applied, but the display device to which the polarizer according to the present invention is applied is not limited to the organic light emitting display device.

10A and 10B are views each showing a liquid crystal display device to which a polarizer according to the present invention is applied.

As shown in FIGS. 10 and 10B , a gate electrode 325 is formed on the first substrate 310 , and a gate insulating layer 312 is stacked over the entire first substrate 325 . A semiconductor layer 332 is formed on the gate insulating layer 312 , and a source electrode 327 and a drain electrode 328 are formed thereon. In addition, a passivation layer 314 is formed over the entire first substrate 310 .

A plurality of common electrodes 330 are formed on the gate insulating layer 312 , a pixel electrode 333 is formed on the protective layer 314 , and a contact hole in which the pixel electrode 333 is formed in the protective layer 314 . As it is electrically connected to the pixel electrode 333 through , and a signal is applied to the pixel electrode 333 , an electric field E is generated between the common electrode 330 and the pixel electrode 333 .

In this case, the common electrode 330 is formed over the entire area of the pixel in a dummy shape, and a plurality of pixel electrodes 330 are formed at regular intervals. In addition, although not shown in the drawings, the common electrode 330 may be formed on the first substrate 310 or the passivation layer 314 , and the pixel electrode 330 is formed on the first substrate 310 or the gate insulating layer. It may be formed over 312 .

In addition, both the common electrode 330 and the pixel electrode 330 may be formed in a band shape of a predetermined width and alternately disposed.

A black matrix 363 and a color filter layer 365 are formed on the second substrate 360 . The black matrix 363 is used to prevent light from leaking to a region where liquid crystal molecules do not operate. As shown in the figure, the black matrix 363 is located in the thin film transistor region and between the pixel and the pixel (ie, the gate line and the data line region). mainly formed The color filter layer 365 is composed of R (Red), B (Blue), and G (Green) to realize actual colors. An overcoat layer for protecting the color filter layer 365 and improving the flatness of the substrate may be formed on the color filter layer 365 .

A liquid crystal layer 368 is formed between the first substrate 310 and the second substrate 360 .

As described above, in the liquid crystal display panel, an electric field is generated in the liquid crystal layer 368 by the common electrode 330 and the pixel electrode 333, and the liquid crystal molecules in the liquid crystal layer 368 are moved on a plane by the electric field. Since it rotates, an image can be displayed by adjusting the transmittance of light passing through the liquid crystal layer 368 by the refractive index anisotropy of the liquid crystal molecules.

As shown in FIG. 10A , first and second polarization layers 370a and 370b are formed on the upper and lower surfaces of the liquid crystal display panel, that is, the rear surface of the first substrate 310 and the upper surface of the second substrate 360, respectively. By linearly polarizing the light passing through the liquid crystal layer 368, the image can be realized by controlling the transmittance of the light.

Also, as shown in FIG. 10B , the first and second polarization layers 370a and 370b may be formed on the first substrate 310 and the second substrate 360 inside the liquid crystal display. In this case, first and second buffer layers 374a and 374b may be respectively formed between the first polarization layer 370a and the gate insulating layer 312 and between the second polarization layer 370b and the color filter layer 365 . . The first and second buffer layers 374a and 374b may be formed of an inorganic material and/or an organic material, but are not limited thereto.

The first and second polarization layers 370a and 370b are formed of a supramolecular structure in which discotic liquid crystal molecules and fluorenones are alternately arranged along one direction.

At this time, when the liquid crystal display device is in the normally black mode, the arrangement direction of the discotic liquid crystal molecules and the fluorenone of the first and second polarization layers 370a and 370b, that is, the long axis of the supramolecular structure is mutual vertical, and when the liquid crystal display is in a normally white mode, the long axes of the supramolecular structures of the first and second polarization layers 370a and 370b are parallel to each other.

For example, in the normally black mode, light passing through the first polarization layer 370a is linearly polarized in the x-axis direction and input to the liquid crystal layer 368 . When the liquid crystal molecules are arranged in a direction parallel to each other in the entire area of the liquid crystal layer 368 of the liquid crystal display having the above structure, when no signal is applied to the liquid crystal display, the liquid crystal molecules are arranged along the x-axis direction. , the light incident on the liquid crystal layer 368 is linearly polarized along the x-axis direction and passes through the liquid crystal layer 368 as it is.

Since the short axis of the supramolecular structure of the second polarization layer 140, that is, the light transmission axis, is perpendicular to the polarization direction of the light transmitted through the liquid crystal layer 368, the light transmitted through the liquid crystal layer 368 is transmitted through the second polarization layer 370b. ), so that no light is output to the outside of the second polarization layer 370b, the screen is displayed in black.

Since the first and second polarizing layers 370a and 370b may be formed by applying a supramolecular structure to the first and/or second surfaces of the first and second substrates 310 and 360, respectively, separate separate polarizing plates for manufacturing the polarizing plate may be formed. Since there is no need for a manufacturing process or a separate attaching process for attaching the polarizing plate, it is possible to shorten the manufacturing time and reduce the manufacturing cost.

In addition, since the first and second polarization layers 370a and 370b can be formed very thinly in the form of a thin film, a thin liquid crystal display device can be manufactured.

Various modifications of the present invention or structures that can be easily devised based on the present invention should also be included in the scope of the present invention. Accordingly, the scope of the present invention should not be determined by the above detailed description, but should be determined by the appended claims.

Claims (14)

1. It is composed of a supramolecular structure comprising a discotic liquid crystal molecule of Formula 1 and a fluorenone derivative of Formula 2,

   The supramolecular structure is a polarizer, characterized in that a plurality of discotic liquid crystal molecules and fluorenone derivatives are alternately arranged with each other in a first direction to form a long axis.

   [Formula 1]

   

   where R is C ₆ H ₁₁ , C ₆ H ₁₃ and C ₈ H ₁₇

   [Formula 2]

   

   Here, the substituents M and N are both NO ₂ , M is H and N is HO ₂ , or both M and M are H.
2. The polarizer according to claim 1, wherein the discotic liquid crystal molecule and the fluorenone derivative form a charge transfer complex.
3. The fluorenone derivative according to claim 1, wherein when both of the substituents M and N are NO ₂ , the fluorenone derivative is 2,4,7-Trinitro-9-Fluorenone, M is H and N is HO _{2 When the} fluorenone derivative is 2,4 -Dinitro-9-Fluorenone, and when M and M are both H, the fluorenone derivative is 2-Nitro-9-Fluorenone.
4. The polarizer according to claim 1, wherein the supramolecular structure absorbs light vibrating in a direction parallel to the long axis.
5. According to claim 1, further comprising a support to which the supramolecular structure is applied,

   A polarizer, characterized in that the support is substituted with an alkyl group to alternately arrange the discotic liquid crystal molecules and the fluorenone derivative in a first direction.
6. Forming a supramolecular structure by mixing the discotic liquid crystal molecule of Formula 1 and the fluorenone derivative of Formula 2;

   dropping a mixture of the discotic liquid crystal molecule and the fluorenone derivative onto a support substituted with an alkyl group on a predetermined region; and

   By moving the blade in the second direction according to the liquid-phase shearing method, a mixture of the discotic liquid crystal molecules and the fluorenone derivative is applied to the support, and the discotic liquid crystal molecules are combined with the discotic liquid crystal molecules along the first direction perpendicular to the second direction. A method for manufacturing a polarizer comprising the steps of alternately arranging a mixture of the fluorenone derivative.

   [Formula 1]

   

   where R is C ₆ H ₁₁ , C ₆ H ₁₃ and C ₈ H ₁₇

   [Formula 2]

   

   Here, the substituents M and N are both NO ₂ , M is H and N is HO ₂ , or both M and M are H.
7. The method of claim 6, wherein the mixing of the discotic liquid crystal molecule and the fluorenone derivative comprises:

   mixing the discotic liquid crystal molecule and the fluorenone derivative in a 1:1 molar ratio; and

   A method for producing a polarizer, comprising the step of stirring the mixed discotic liquid crystal molecules and the fluorenone derivative at a temperature of 60° C. for 2 hours.
8. The method of claim 6, wherein the step of applying the mixture of the discotic liquid crystal molecules and the fluorenone derivative to the support is performed by moving the blade at 70° C. along the second direction at a shear rate of 10-20 μm/s. A method for manufacturing a polarizer comprising applying a mixture of discotic liquid crystal molecules and the fluorenone derivative to the support.
9. a display panel that implements an image;

   A display device comprising the polarizing layer according to any one of claims 1 to 5 formed on at least one side of the display panel.
10. The display device of claim 9 , wherein the display panel is an organic light emitting display panel.
11. The display device of claim 10 , wherein the polarization layer is formed on an upper surface or a rear surface of the organic light emitting display panel.
12. The display device according to claim 9, wherein the display panel is a liquid crystal display panel.
13. The display device of claim 12 , wherein the polarization layer is formed on upper and lower surfaces of the liquid crystal display panel, respectively.
14. The display device of claim 12 , wherein the polarization layer is formed on inner surfaces of the upper and lower substrates of the liquid crystal display panel, respectively.

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