CN115657374A - Optical film, preparation method thereof, optical assembly and flexible display device - Google Patents
Optical film, preparation method thereof, optical assembly and flexible display device Download PDFInfo
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- CN115657374A CN115657374A CN202211330047.5A CN202211330047A CN115657374A CN 115657374 A CN115657374 A CN 115657374A CN 202211330047 A CN202211330047 A CN 202211330047A CN 115657374 A CN115657374 A CN 115657374A
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Abstract
The application belongs to the technical field of optical film manufacturing, and particularly relates to an optical film, a preparation method thereof, an optical assembly and a flexible display device. The preparation method of the optical film comprises the following steps: preparing an alignment material solution and a liquid crystal material solution; coating the alignment material solution on a flexible substrate, and aligning the alignment material solution to form an alignment layer; and coating the liquid crystal material solution on the alignment layer to form a liquid crystal layer, wherein the pretilt angle of liquid crystal molecules of the liquid crystal layer is 0 degree. The optical film of the embodiment of the application can be arranged on the light incident side of the polarizer, and the liquid crystal layer is positioned between the polarizer and the alignment layer, so that the visual angle can be improved, the risk of reflecting natural light from the cathode of the display device is reduced, and the problem of dark state light leakage of the compensation film in the related art is solved.
Description
Technical Field
The application belongs to the technical field of optical film manufacturing, and particularly relates to an optical film, a preparation method of the optical film, an optical assembly and a flexible display device.
Background
With the continuous upgrading and improvement of display technology, the application of OLED (Organic Light-Emitting Diode) display devices is becoming more and more widespread, and the OLED display devices are favored by virtue of the characteristics of large display viewing angle, flexibility, bending and the like.
Under irradiation of natural light, the natural light is easily reflected by the cathode of the OLED display device, resulting in a decrease in contrast of the OLED display device. In order to solve this problem, a compensation film may be added to the OLED display device, and the compensation film may be prepared using a positive distribution liquid crystal. However, the liquid crystal with positive distribution has poor characteristics after film formation, so that it is difficult to avoid the dark state light leakage problem caused by the projection deviation of the polarizing axis of the polarizer in different wavelength bands, and the display effect of the display device is poor.
Disclosure of Invention
An object of the embodiments of the present application is to provide an optical film, a method for manufacturing the same, an optical assembly, and a flexible display device, which can solve the problem of dark-state light leakage of a compensation film in the related art.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a method for manufacturing an optical film, including:
preparing an alignment material solution and a liquid crystal material solution;
coating the alignment material solution on a flexible substrate, and aligning the alignment material solution to form an alignment layer;
and coating the liquid crystal material solution on the alignment layer to form a liquid crystal layer, wherein the pretilt angle of liquid crystal molecules of the liquid crystal layer is 0 degree.
In a second aspect, embodiments of the present application provide an optical film, which is prepared by using the above method for preparing an optical film, where the optical film includes an alignment layer and a liquid crystal layer, and a pretilt angle of liquid crystal molecules of the liquid crystal layer is 0 °.
In a third aspect, an embodiment of the present application provides an optical assembly, which includes a polarizer and the above optical film, where the optical film is disposed on a light incident side of the polarizer, and the liquid crystal layer is located between the polarizer and the alignment layer.
In a fourth aspect, an embodiment of the present application provides a flexible display device, which includes an organic light emitting layer, a cathode, and the above optical component, wherein the cathode is located between the organic light emitting layer and the optical component, and the alignment layer is located between the cathode and the liquid crystal layer.
The alignment layer is formed on the flexible substrate, the liquid crystal layer is formed on the alignment layer, the pretilt angle of liquid crystal molecules is 0 degree, the optical film formed by the preparation method of the embodiment has reverse wavelength dispersion characteristics, the optical film can be arranged on the light incident side of the polaroid, and the liquid crystal layer is positioned between the polaroid and the alignment layer, so that the visual angle can be improved, the risk of reflecting natural light from the cathode of the display device is reduced, and the problem of dark-state light leakage of the compensation film in the related technology is solved.
Drawings
FIG. 1 is a schematic structural diagram of an optical film disclosed in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a system for manufacturing the optical film disclosed in the embodiments of the present application.
Description of reference numerals:
101-flexible substrate, 102-alignment layer, 103-liquid crystal layer, 110-unwinding device, 120-cleaning device, 130-first coating device, 140-first drying device, 150-alignment device, 160-second coating device, 170-second drying device, 180-cooling device, 190-curing device and 200-winding device.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.
The optical film, the manufacturing method thereof, the optical assembly and the flexible display device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, an embodiment of the present application discloses a method for manufacturing an optical film, including:
s100, preparing an alignment material solution and a liquid crystal material solution;
this step may mix the alignment material with a solvent, which may be dimethyl-methylamine, butanone, isopropanol, or the like, to obtain an alignment material solution, and likewise, may mix the liquid crystal material with a solvent to obtain a liquid crystal material solution. The alignment material may contain an additive such as a photosensitizer, the liquid crystal material may contain a resin and an additive such as a leveling agent and a photosensitizer, and the solvent may be ethylene glycol monobutyl ether, toluene, ethyl acetate, and the like. Optionally, the solid content of the alignment material solution is 1% to 15%, and when the solid content is lower than 1%, the solvent amount is too large, the cost is increased, the viscosity is low, and the film thickness uniformity is poor; when the solid content is higher than 15%, the wet film thickness is low, and the film is difficult to form; the solid content of the liquid crystal material solution is 10-60%, when the solid content is lower than 10%, the solvent amount is too large, the cost is increased, and the film thickness uniformity is poor due to the low viscosity; when the solid content is higher than 60%, the wet film thickness is low, and the film is difficult to form; the alignment material can be fully dissolved by preparing the alignment material solution, so that the coating is convenient, and the liquid crystal material can be fully dissolved by preparing the liquid crystal material solution, so that the coating is convenient.
S200, coating the alignment material solution on the flexible substrate 101, and aligning the alignment material solution to form an alignment layer 102; alternatively, the flexible substrate 101 may be a flexible film such as PET (Polyethylene Terephthalate), TAC (Triacetyl Cellulose, triacetate film), COP (Cyclo Olefin Polymer), PI (Polyimide), PE (Polyethylene), PMMA (Polymethyl Methacrylate), or the like.
The alignment layer 102 can provide a uniform alignment condition for the liquid crystal molecules, so that the liquid crystal molecules are aligned in a predetermined order. The alignment material solution is coated on the flexible substrate 101, and the alignment of the alignment material solution can be further performed, and the alignment specifically may be rubbing alignment or UV exposure alignment, and when the UV exposure alignment is performed, the energy of the ultraviolet light may be 5 to 100mJ. Alternatively, the thickness of the flexible substrate 101 may be 10 to 300 micrometers.
S300, coating the liquid crystal material solution on the alignment layer 102 to form a liquid crystal layer 103, wherein the pretilt angle of liquid crystal molecules of the liquid crystal layer 103 is 0 degree; it should be noted that the pre-tilt angle of the liquid crystal layer is 0 ° in the present application, but the pre-tilt angle of the liquid crystal molecules finally obtained may be slightly larger than 0 ° or slightly smaller than 0 ° due to the influence of other factors during the formation of the liquid crystal layer 103.
After the liquid crystal material solution is coated on the alignment layer 102, under the action of the alignment layer 102, the pretilt angle of the liquid crystal molecules of the liquid crystal layer 103 is 0 °, that is, the liquid crystal molecules of the liquid crystal layer 103 extend along the plane of the liquid crystal layer 103, so as to form the optical film having a certain alignment shape and reverse wavelength dispersion characteristics.
In the embodiment of the present application, the alignment layer 102 is formed on the flexible substrate 101, the liquid crystal layer 103 is formed on the alignment layer 102, and the pretilt angle of the liquid crystal molecules is 0 °, and the optical film formed by the preparation method of the embodiment has a reverse wavelength dispersion characteristic, and the optical film can be disposed on the light incident side of the polarizer, that is, the optical film is disposed below the polarizer, light emitted by the flexible display device can enter the polarizer through the optical film, and light in an external environment enters the optical film through the polarizer. Meanwhile, the liquid crystal layer 103 is located between the polarizer and the alignment layer 102, which can improve the viewing angle and reduce the risk of natural light reflected from the cathode of the display device, thereby solving the problem of dark state light leakage of the compensation film in the related art.
Some devices require less thickness for the optical film, and thus the optical film may be provided to the device in conjunction with the flexible substrate 101. Optionally, the preparation method further comprises steps S400, removing the flexible substrate 101 to form the optical film. The embodiment is suitable for equipment with higher requirements on the thickness of the optical film, and the optical film can be thinner by removing the flexible substrate 101, so that the thickness requirement of the optical film is met.
The flexible substrate 101 is used to facilitate forming the alignment layer 102 and the liquid crystal layer 103, so after the preparation of the alignment layer 102 and the liquid crystal layer 103 is completed, the flexible substrate 101 may be removed, specifically, the flexible substrate may be removed by a transfer printing or the like, which is not limited in this embodiment of the present application.
Alternatively, when the alignment material and the liquid crystal material are coated, processes such as slit Coating (Slot Die), bar Coating (Bar Coating), reverse Roll Coating (Reverse Roll Coating), tension control Coating (Web Tension Die), and Gravure Coating (Gravure Coating) may be selected.
The liquid crystal material solution applied to the alignment layer 102 contains a solvent, and the solvent can be volatilized by natural drying, so that the desired liquid crystal layer 103 can be obtained. However, this drying method is inefficient, and therefore, in an alternative embodiment, after the step S300 of coating the liquid crystal material solution on the alignment layer 102, the method further includes:
s310, heating the liquid crystal material solution coated on the alignment layer 102 to obtain a dried liquid crystal film, wherein the thickness of the liquid crystal film is 1-5 microns;
the heating of the liquid crystal material solution can quickly and completely evaporate the solvent, thereby improving the production efficiency of the optical film.
And S320, cooling the liquid crystal film to form a liquid crystal layer 103.
Alternatively, the temperature of the liquid crystal film may be cooled to 75 ℃ or less. After the liquid crystal film is cooled, experimental tests show that: r0 (450)/R0 (550) is 0.874 at 50 ℃, 0.858 at 30 ℃ and 0.850 at 24 ℃, and the numerical value is closer to the theoretical value of 0.81, the more excellent the reverse dispersion characteristic of the liquid crystal layer 103 is.
The alignment material solution coated on the flexible substrate 101 contains a solvent, and the solvent may be volatilized by a natural drying method, so that the desired alignment layer 102 is formed. However, this drying method is inefficient, and therefore, in an alternative embodiment, after the step S200 of coating the alignment material solution on the flexible substrate 101, the method further includes:
s210, heating the alignment material solution coated on the flexible substrate 101 to obtain a dried alignment film, wherein the thickness of the alignment film is 0.1-0.5 microns.
The alignment material solution is heated, so that the solvent can be rapidly and completely evaporated, and the production efficiency of the optical film is improved.
In step S210, the heating temperature and the heating time for heating the alignment material solution may be flexibly selected, and similarly, in step S310, the heating temperature and the heating time for heating the liquid crystal material solution may be flexibly selected, and when the heating temperature is low, the drying efficiency is not high enough, and when the heating temperature is high, the alignment material and the liquid crystal material are easily damaged; when the heating time is short, the drying effect is not good, and when the heating time is long, the solvent is volatilized, but the heating is still carried out, so that the preparation cost is increased. Therefore, in an alternative embodiment, in step S210 and step S310, the heating temperature is 60 to 150 ℃, so as to prevent the alignment material and the liquid crystal material from being damaged while improving the drying efficiency, and the heating time is 1 to 10min, so as to control the manufacturing cost while improving the drying effect.
In an alternative embodiment, the method of making an optical film further comprises:
and S330, carrying out ultraviolet curing on the liquid crystal layer 103.
The uv curing herein may initiate a photo polymerization reaction to facilitate the solidification of the liquid crystal material, thereby forming the liquid crystal layer 103 with relatively stable properties. Alternatively, when the ultraviolet curing is performed, the energy of the ultraviolet light may be 100 to 2000mJ.
In an optional embodiment, before step S200, the method further includes:
and S110, sequentially performing dust adhering roller cleaning, plasma cleaning and ultrasonic cleaning on the flexible base material 101.
Specifically, large foreign matter of about 100 micrometers can be removed by cleaning with a dust roller, and when plasma cleaning is used, the contact angle of the surface of the flexible substrate 101 can be reduced, but such cleaning may cause electrostatic adsorption problems, so that foreign matter is easily adsorbed on the surface of the flexible substrate 101, and then small foreign matter of about 20 micrometers can be removed by ultrasonic cleaning. This embodiment can eliminate foreign materials on the surface of the flexible substrate 101, so that the surface of the flexible substrate 101 becomes smoother, and thus the contact angle of the flexible substrate 101 can be reduced, so as to obtain a reverse wavelength dispersion characteristic film. Alternatively, the contact angle of the flexible substrate 101 may be 10 to 70 °.
The present application uses a flexible substrate 101, such that the steps can be integrated into a continuous process, such as a roll-to-roll process. At this time, the apparatus for preparing an optical film may include an unwinding device 110, a cleaning device 120, a first coating device 130, a first drying device 140, an alignment device 150, a second coating device 160, a second drying device 170, a cooling device 180, a curing device 190, and a winding device 200, wherein: the unwinding device 110 is configured to unwind the flexible substrate 101, the cleaning device 120 is configured to clean the flexible substrate 101 (specifically, the foregoing dust-adhering roller cleaning, plasma cleaning, and ultrasonic cleaning), the first coating device 130 is configured to coat the alignment material solution, the first drying device 140 is configured to heat and dry the alignment material solution, the alignment device 150 is configured to align the alignment material to form the alignment layer 102, the second coating device 160 is configured to coat the liquid crystal material solution, the second drying device 170 is configured to heat and dry the liquid crystal material solution, the cooling device 180 is configured to cool the liquid crystal film, the curing device 190 is configured to cure the liquid crystal film to form the liquid crystal layer 103, and the winding device 200 is configured to wind the optical film.
In an alternative embodiment, the optical film has a first phase difference for light with a wavelength of 450nm and a second phase difference for light with a wavelength of 550nm, and the ratio of the first phase difference to the second phase difference is greater than or equal to 0.8 and less than 1, that is, the optical film of the embodiment of the present application has reverse wavelength dispersion characteristics.
The embodiment of the application also discloses an optical film which is prepared by adopting the preparation method in any embodiment, the optical film comprises an alignment layer 102 and a liquid crystal layer 103, and the pretilt angle of liquid crystal molecules of the liquid crystal layer 103 is 0 degree. The optical film has reverse wavelength dispersion characteristics, and can be arranged on the light incident side of the polarizer, namely, the optical film is arranged below the polarizer, and the liquid crystal layer 103 is arranged between the polarizer and the alignment layer 102, so that the viewing angle can be improved, the risk of reflecting natural light from the cathode of the display device is reduced, and the problem of dark state light leakage of the compensation film in the related art is solved.
The embodiment of the application further discloses an optical assembly, which comprises a polarizer and the optical film of the embodiment, wherein the optical film is arranged on the light incident side of the polarizer, and the liquid crystal layer 103 is positioned between the polarizer and the alignment layer 102.
The optical film of the embodiment of the application has a reverse wavelength dispersion characteristic, and the optical film can be disposed on the light incident side of the polarizer, and the liquid crystal layer 103 is located between the polarizer and the alignment layer 102, so that the viewing angle can be improved, the risk of natural light reflected from the cathode of the display device can be reduced, and the problem of dark-state light leakage of the compensation film in the related art can be solved.
The embodiment of the application also discloses a flexible display device, which comprises an organic light-emitting layer, a cathode and the optical component of the embodiment, wherein the cathode is positioned between the organic light-emitting layer and the optical component, and the alignment layer 102 is positioned between the cathode and the liquid crystal layer 103. Because the optical film has reverse wavelength dispersion characteristics, the flexible display device is not easy to have the problem of dark state light leakage, and the display effect is better.
In the above embodiments of the present invention, the difference between the embodiments is mainly described, and different optimization features between the embodiments can be combined to form a better embodiment as long as they are not contradictory, and further description is omitted here in view of brevity of the text.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A method of making an optical film, comprising:
preparing an alignment material solution and a liquid crystal material solution;
coating the alignment material solution on a flexible substrate (101), and aligning the alignment material solution to form an alignment layer (102);
the liquid crystal material solution is coated on the alignment layer (102) to form a liquid crystal layer (103), and the pretilt angle of liquid crystal molecules of the liquid crystal layer (103) is 0 degree.
2. The method according to claim 1, wherein after the step of applying the liquid crystal material solution on the alignment layer (102), further comprising:
heating the liquid crystal material solution coated on the alignment layer (102) to obtain a dried liquid crystal film, wherein the thickness of the liquid crystal film is 1-5 microns;
cooling the liquid crystal film to form the liquid crystal layer (103).
3. The method according to claim 2, wherein the step of applying the alignment material solution on the flexible substrate (101) further comprises:
heating the alignment material solution coated on the flexible substrate (101) to obtain a dried alignment film, wherein the thickness of the alignment film is 0.1-0.5 microns.
4. The method according to claim 3, wherein the step of heating the liquid crystal material solution coated on the alignment layer (102) and the step of heating the alignment material solution coated on the flexible substrate (101) are performed at a temperature of 60 to 150 ℃ for 1 to 10min.
5. The method of manufacturing according to claim 1, further comprising:
the liquid crystal layer (103) is UV cured.
6. The method according to claim 1, wherein the step of coating the alignment material solution on the flexible substrate (101) further comprises:
the flexible substrate (101) is subjected to a dust-adhering roller cleaning, a plasma cleaning and an ultrasonic cleaning in this order.
7. The method according to claim 1, wherein the optical film has a first retardation with respect to light having a wavelength of 450nm and a second retardation with respect to light having a wavelength of 550nm, and a ratio of the first retardation to the second retardation is 0.8 or more and less than 1.
8. An optical film prepared by the method according to any one of claims 1 to 7, comprising an alignment layer (102) and a liquid crystal layer (103), wherein the pretilt angle of liquid crystal molecules of the liquid crystal layer (103) is 0 °.
9. An optical assembly comprising a polarizer and the optical film of claim 8, wherein the optical film is disposed on the light-entering side of the polarizer, and wherein the liquid crystal layer (103) is disposed between the polarizer and the alignment layer (102).
10. A flexible display device comprising an organic light emitting layer, a cathode and an optical component according to claim 9, the cathode being located between the organic light emitting layer and the optical component, the alignment layer (102) being located between the cathode and the liquid crystal layer (103).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211330047.5A CN115657374A (en) | 2022-10-27 | 2022-10-27 | Optical film, preparation method thereof, optical assembly and flexible display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211330047.5A CN115657374A (en) | 2022-10-27 | 2022-10-27 | Optical film, preparation method thereof, optical assembly and flexible display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520612A (en) * | 2023-04-20 | 2023-08-01 | 成都瑞波科材料科技有限公司 | Optical module and optical film processing apparatus |
| CN116559990A (en) * | 2023-04-24 | 2023-08-08 | 成都瑞波科材料科技有限公司 | Viewing angle compensation film, manufacturing method thereof and liquid crystal display panel |
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2022
- 2022-10-27 CN CN202211330047.5A patent/CN115657374A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520612A (en) * | 2023-04-20 | 2023-08-01 | 成都瑞波科材料科技有限公司 | Optical module and optical film processing apparatus |
| CN116520612B (en) * | 2023-04-20 | 2024-05-28 | 成都瑞波科材料科技有限公司 | Optical module and optical film processing apparatus |
| CN116559990A (en) * | 2023-04-24 | 2023-08-08 | 成都瑞波科材料科技有限公司 | Viewing angle compensation film, manufacturing method thereof and liquid crystal display panel |
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Inventor after: Jia Changjian Inventor before: Jia Changjian Inventor before: Cui Yongmin |