CN117092736A

CN117092736A - Circular polarizer, preparation method and correction simulation method thereof

Info

Publication number: CN117092736A
Application number: CN202311015705.6A
Authority: CN
Inventors: 姜旭枫; 洪溢凡; 邱大任; 裴晓明; 林宝文
Original assignee: Shenzhen Etsuch Technology Co ltd
Current assignee: Shenzhen Etsuch Technology Co ltd
Priority date: 2023-08-11
Filing date: 2023-08-11
Publication date: 2023-11-21

Abstract

The application belongs to the technical field of optical elements, and provides a circular polaroid, a preparation method and a correction simulation method thereof, wherein the circular polaroid comprises a filter layer, a polarizing matrix and a phase compensation layer, the filter layer comprises an upper TAC layer and a first phase retardation film, and the first phase retardation film is coated on the inner peripheral side of the upper TAC layer; the phase compensation layer comprises a second phase retardation film, a lower TAC layer and a third phase retardation film, wherein the second phase retardation film is coated on the upper surface of the lower TAC layer, and the third phase retardation film is coated on the lower surface of the lower TAC layer. A preparation method of the circular polarizer comprises the second phase retardation film, the lower TAC layer, the third phase retardation film and the C-plate liquid crystal viewing angle compensation film. The application discloses a correction simulation method of a circular polarizer, which is suitable for the circular polarizer and aims to solve the technical problem of thicker circular polarizer in the prior art.

Description

Circular polarizer, preparation method and correction simulation method thereof

Technical Field

The application belongs to the technical field of optical elements, and particularly relates to a circular polarizer, a preparation method and a correction simulation method thereof.

Background

With the recent increasing demand for curved image display devices, and/or bendable or foldable image display devices, if the thickness of the polarizing plate is large, the bending angle of the curved screen is reduced, and the flexibility of the curved screen can be improved by reducing the thickness of the polarizing plate, so that the curved screen is more convenient to bend, and other physical properties of the polarizing plate are not affected.

In addition, the OLED display panel itself emits linearly polarized light after passing through an optical plate having a phase difference layer structure, and if a user brings polarized sunglasses, the user cannot observe the picture of the OLED display panel at a specific angle.

Disclosure of Invention

The embodiment of the application aims to provide a circular polaroid, a preparation method and a correction simulation method thereof, so as to solve the technical problem of thicker circular polaroid in the prior art.

In order to achieve the above purpose, the application adopts the following technical scheme: a circular polarizer, the circular polarizer comprising: a filter layer including an upper TAC layer and a first phase retardation film coated on an inner peripheral side of the upper TAC layer; a polarizing substrate; the phase compensation layer comprises a second phase delay film, a lower TAC layer and a third phase delay film, wherein the second phase delay film is coated on the upper surface of the lower TAC layer, and the third phase delay film is coated on the lower surface of the lower TAC layer; wherein the filter layer, the polarizing substrate and the phase compensation layer are sequentially laminated and connected; the first phase delay film and the third phase delay film are quarter-phase delay films, and the second phase delay film is a half-phase delay film.

Compared with the prior art, the circular polaroid has the beneficial effects that the second phase retardation film is coated on the upper surface of the lower TAC layer, and the third phase retardation film is coated on the lower surface of the lower TAC layer, so that the traditional mode of using adhesive is replaced, the thickness of the thinned circular polaroid is achieved, and the production cost is reduced. The phase compensation layer has the characteristic that the longer the wavelength is, the larger the phase difference value is, so that the problem of interference caused by the incident light source of the outside being incident on the organic EL display device is solved.

In one embodiment provided by the application, an acute angle included between an optical axis of the first phase retardation film and an absorption axis of the polarizing substrate ranges from 40 degrees to 50 degrees, and an in-plane phase difference value of the first phase retardation film ranges from 120nm to 160nm; the included angle of the acute angle between the optical axis of the second phase retardation film and the absorption axis of the polarizing substrate is 7.5-22.5 degrees, and the range of the in-plane phase difference value of the second phase retardation film is 210-290 nm; the included angle of the acute angle between the optical axis of the third phase retardation film and the absorption axis of the polarizing substrate is 67.5-82.5 degrees, and the range of the in-plane phase difference value of the third phase retardation film is 100-150 nm.

In one embodiment of the present application, the phase compensation layer further includes a C-plate liquid crystal viewing angle compensation film disposed between the second phase retardation film and the lower TAC layer or between the lower TAC layer and the third phase retardation film in the phase compensation layer; or the C-plate liquid crystal visual angle compensation film is arranged on the upper surface or the lower surface of the phase compensation layer.

In one embodiment provided by the present application, the C-plate liquid crystal viewing angle compensation film is laminated between the lower TAC layer and the third phase retardation film; the range of the phase difference value in the vertical plane of the C-plate liquid crystal visual angle compensation film is 50nm-160nm.

In one embodiment of the present application, the vertical in-plane phase difference value of the C-plate liquid crystal viewing angle compensation film ranges from 60nm to 110nm.

In one embodiment of the present application, the circular polarizer further includes an adhesive layer; the bonding layer is respectively arranged between the filter layer and the polarizing substrate and between the polarizing substrate and the phase compensation layer.

In one embodiment provided by the present application, the phase compensation layer has a thickness of 1 micron to 25 microns. Therefore, the requirement of thinning the display is met.

In one embodiment of the present application, the phase compensation layer is a liquid crystal reverse dispersion film, the second phase retardation film and the third phase retardation film are both liquid crystal films having positive dispersion characteristics, and the C-plate liquid crystal viewing angle compensation film is a liquid crystal film having in-plane vertical phase difference characteristics.

In one embodiment of the present application, the second phase retardation film is a liquid crystal type a-plate phase retardation film, a liquid crystal type O-plate phase retardation film, or a liquid crystal type biaxial phase retardation film; and/or; the third phase retardation film is a liquid crystal type A plate phase retardation film, a liquid crystal type O plate phase retardation film or a liquid crystal type double-shaft phase retardation film.

The application also provides a preparation method of the circular polaroid, wherein the circular polaroid at least comprises a phase compensation layer, and the phase compensation layer comprises a second phase retardation film, a C-plate liquid crystal viewing angle compensation film, a lower TAC layer and a third phase retardation film which are sequentially laminated; the preparation method is used for preparing the phase compensation layer and at least comprises the following steps: preparing an alignment coating, a positive dispersion liquid crystal coating and a C-plate liquid crystal coating; the alignment paint is coated on the upper surface of the lower TAC layer and is dried and subjected to linear polarization UV curing, or the alignment paint is coated on the upper surface of the lower TAC layer and is dried and subjected to common UV curing, or the active paint is coated on the upper surface of the lower TAC layer and is dried and then coated on the upper surface of the lower TAC layer, and the C-plate liquid crystal viewing angle compensation film is formed after the drying UV curing; coating the alignment coating on the C-plate liquid crystal visual angle compensation film, drying and carrying out linear polarization UV curing, and then coating the positive dispersion liquid crystal on the C-plate liquid crystal visual angle compensation film, wherein the positive dispersion liquid crystal is dried and UV cured to form the second phase retardation film; and coating the alignment coating on the lower surface of the lower TAC layer, drying and linearly polarized UV curing, coating the positive dispersion liquid crystal on the lower surface of the lower TAC layer, and drying and UV curing to form the third phase retardation film.

The application also provides a correction simulation method of the circular polarizer, which is suitable for the circular polarizer in any embodiment, and comprises the steps of inputting a first parameter, constructing a Mueller matrix of the circular polarizer, using natural light to enter the circular polarizer, calculating a transmitted light error through ellipsometry, and evaluating the performance under the current first parameter through an evaluation function to obtain an optimal value and an optimal parameter; calculating ellipsometry of single transmitted light to evaluate the closing performance of the sunglasses; inputting a second parameter, calculating the transmitted light errors under the azimuth of different incident angles, calculating an evaluation function, counting the evaluation function values and distribution conditions under different azimuth angles, and calculating the phase difference value and the corresponding parameter in the optimal vertical plane.

In one embodiment provided by the application, the first parameters include the phase difference of each phase retardation film at different wavelengths, the included angle relative to the transmission axis of the polarizing substrate, the refractive index and extinction coefficient at different wavelengths of the polarizing substrate, and the azimuth angle; constructing a phase delay Mueller matrix through the phase difference and the included angle; calculating dichroism through the refractive index and the extinction coefficient, and constructing a dichroism Mueller matrix by combining the included angles; and carrying the phase delay Mueller matrix and the dichroism Mueller matrix into polar decomposition to calculate the Mueller matrix of the circular polarizer.

In one embodiment provided by the present application, the second parameter includes a range of phase difference values in a vertical plane, a refractive index of the C-plate liquid crystal viewing angle compensation film, the optimal parameter, and an optimal value of the evaluation function.

In one embodiment of the present application, the step of calculating the phase difference value in the optimal vertical plane includes: and calculating a minimum evaluation function through the evaluation function values and the distribution conditions, and analyzing the uniformity of the evaluation function to obtain an optimal vertical in-plane phase difference value.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view showing the overall structure of a circular polarizer according to an embodiment of the present application;

FIG. 2 is a schematic diagram showing two types of overall structures of a C-plate liquid crystal viewing angle compensation film of a circular polarizer provided by the application, wherein the two types of the C-plate liquid crystal viewing angle compensation film are arranged on the outer side of a phase compensation layer;

FIG. 3 is a schematic diagram showing the overall structure of a C-plate liquid crystal viewing angle compensation film of a circular polarizer according to the present application in two forms disposed between two adjacent layers;

FIG. 4 is a perspective view of the overall structure of an embodiment of an optical plate provided by the present application;

FIG. 5 shows ellipsometry of a linear polarizer bonded to each of example 4 and comparative example 2 of the correction simulation method according to the present application;

FIG. 6 is a graph showing the wavelength dispersion relationship between example 1 and comparative example 1 of the correction simulation method according to the present application;

FIG. 7 is a graph showing the error relationship between example 1 and comparative example 1 of the correction simulation method according to the present application;

FIG. 8 is a reflectance spectrum of example 2 and comparative example 1 of the modified simulation method provided by the present application;

FIG. 9 is a graph of the error ratio, the error uniformity and the average error of the phase difference values in different vertical planes of the C-plate liquid crystal viewing angle compensation film between the second phase retardation film and the polarizing substrate in example 3 of the correction simulation method according to the present application;

FIG. 10 is a graph of the error ratio, the error uniformity and the average error of the phase difference values in different vertical planes of the C-plate liquid crystal viewing angle compensation film between the second phase retardation film and the third phase retardation film according to the embodiment 3 of the correction simulation method of the present application;

FIG. 11 is a graph of the error ratio, the error uniformity and the average error of the phase difference values in different vertical planes of the C-plate liquid crystal viewing angle compensation film between the third phase retardation film and the OLED panel in example 3 of the correction simulation method according to the present application;

fig. 12 is a graph of luminous flux reflectances of example 2 and comparative example 1 of the modified simulation method provided by the present application.

Wherein, each reference sign in the figure:

100-a circular polarizer; 110-a filter layer; 111-upper TAC layer; 112-a first phase retardation film; 120-polarizing substrate; 130-a phase compensation layer; 131-a second phase retardation film; 132-lower TAC layer; 133-a third phase retarder; 134-C-plate liquid crystal viewing angle compensation film;

200-a protective film; 300-an adhesive layer; 400-separation membrane.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

As shown in fig. 1, in one embodiment of the present application, there is provided a circular polarizer 100, the circular polarizer 100 including a filter layer 110, a polarizing substrate 120, and a phase compensation layer 130, the filter layer 110, the polarizing substrate 120, and the phase compensation layer 130 being sequentially connected to one another in a height direction. The filter layer 110 includes an upper TAC layer 111 and a first phase retardation film 112, the first phase retardation film 112 being coated on an inner circumferential side of the upper TAC layer 111 for allowing light to freely pass through polarized sunglasses; the phase compensation layer 130 includes a second phase retardation film 131, a lower TAC layer 132, and a third phase retardation film 133, the second phase retardation film 131 being coated on an upper surface of the lower TAC layer 132, and the third phase retardation film 133 being coated on a lower surface of the lower TAC layer 132. The first phase delay film 112 and the third phase delay film 133 are quarter-phase delay films, and the second phase delay film 131 is a half-phase delay film.

The quarter-phase retardation film is an optical film capable of reversibly converting linearly polarized light and circularly polarized light. In a specific application scenario, natural light is converted into linear polarized light by using a linear polarizing plate, the obtained linear polarized light and circularly polarized light are reversely converted by using a quarter-phase retardation film, half-wave loss is generated in the process of reflecting the circularly polarized light by itself by a reflecting surface, for example, left-handed circularly polarized light is converted into right-handed circularly polarized light in the process of reflecting by the reflecting surface, and right-handed circularly polarized light is converted into left-handed circularly polarized light in the process of reflecting by the reflecting surface.

The half-phase retardation film is used for generating lambda/2 optical path difference for incident linear polarized light, deflecting the linear polarized light and compensating the defect of the short wave domain of the quarter-phase retardation film.

The circular polarizer 100 is used for forming left-handed circularly polarized light when natural light passes through the circular polarizer, changes polarization state when reflected by a metal cathode, and is blocked when the reflected light meets the circular polarizer again.

The filter layer 110 is used for polarized sunglasses through which light can freely pass. If the user looks at the OLED display panel with polarized sunglasses, the OLED display panel itself emits linearly polarized light after passing through the optical plate having the phase difference layer structure, and therefore, the user cannot observe the picture of the OLED display panel at a specific angle, and therefore, the user can see the picture of the OLED display panel even with polarized sunglasses by adding the filter layer 110.

The polarizing substrate 120 is used to realize a polarizing mechanism, and is a linear polarizing plate, and is made of PVA (polyvinyl acetate). In general, the problem of reflection of the organic EL display device under natural light is solved by the cooperation of the polarizing substrate 120 and the circular polarizer 100. For example, the external natural light is firstly incident into the polarizing substrate 120 in the display, the natural light is converted into first linearly polarized light by the polarizing substrate 120, the first linearly polarized light is converted into left circularly polarized light by the third phase delay film 133, the left circularly polarized light is reflected by the metal electrode and then is converted into right circularly polarized light, when the right circularly polarized light passes through the third phase delay film 133, the right circularly polarized light is converted into second linearly polarized light perpendicular to the original vibration direction, namely, the directions of the second linearly polarized light and the first linearly polarized light are perpendicular to each other, and then the second linearly polarized light cannot be absorbed by the linear polarizing plate, so that the anti-reflection effect of eliminating the interference of the external incident light source of the organic EL display device is finally achieved, and the problem that the organic EL display device reflects light under the natural light is solved.

The phase compensation layer 130 has an inverse wavelength dispersion characteristic, which is a characteristic that the smaller the wavelength is, the smaller the phase difference value is, and the larger the wavelength is, so that the phase compensation layer has a good anti-reflection characteristic in the visible light wavelength range of the all-optical domain, and is used for eliminating the problem of interference caused by the incident light source of the external incident light source to the organic EL display device in the all-optical domain.

The phase compensation layer 130 includes a second phase retardation film 131, a lower TAC layer 132, and a third phase retardation film 133, and an effect of reducing the thickness of the phase compensation layer 130 is achieved by coating the second phase retardation film 131 and the third phase retardation film 133 on the lower TAC layer 132, thereby reducing costs and having more application scenes. Wherein the second phase retardation film 131 is coated above the lower TAC layer 132 in the height direction, and the third phase retardation film 133 is coated below the lower TAC layer 132 in the height direction.

In the circular polarizer 100, the filter layer 110, the polarizing substrate 120, and the phase compensation layer 130 are sequentially stacked and connected in a height direction, wherein the upper TAC layer 111 and the first phase retardation film 112 in the filter layer 110 are sequentially stacked and connected, and the second phase retardation film 131, the lower TAC layer 132, and the third phase retardation film 133 in the phase compensation layer 130 are sequentially stacked and connected.

Compared with the prior art, the circular polarizer provided by the application has the beneficial effects that the second phase retardation film 131 is coated on the upper surface of the lower TAC layer 132, and the third phase retardation film 133 is coated on the lower surface of the lower TAC layer 132, so that the traditional mode of applying glue is replaced, the thickness of the thinned circular polarizer 100 is achieved, the production cost is reduced, and the circular polarizer can be suitable for more application scenes. For example, the folding mobile phone can be applied to a flexible mobile phone (folding mobile phone), the bending radius is increased, and the using comfort of a user is improved. Meanwhile, the phase compensation layer 130 has the characteristic that the longer the wavelength is, the larger the phase difference value is, so that the phase compensation layer 130 has good anti-reflection property in the visible light wavelength range of the full-light domain, and the problem of interference caused by the incident light source of the outside incident light source to the organic EL display device is solved in the full-light domain.

In one embodiment of the present application, the first and third phase delay films 112 and 133 are quarter-phase delay films, and the second phase delay film 131 is a half-phase delay film; the acute angle between the optical axis of the first retardation film 112 and the absorption axis of the polarizing substrate 120 is 40 ° -50 °, and the in-plane retardation value of the first retardation film 112 is 120nm-140nm; the acute angle between the optical axis of the second phase retardation film 131 and the absorption axis of the polarizing substrate 120 is in the range of 7.5-22.5 °, and the in-plane phase difference value of the second phase retardation film 131 is in the range of 210nm-290nm; the acute angle between the optical axis of the third retardation film 133 and the absorption axis of the polarizing substrate 120 is in the range of 67.5 ° -82.5 °, and the in-plane phase difference value of the third retardation film 133 is in the range of 100nm-150nm.

If the in-plane phase difference values of the second and third phase retardation films 131 and 133 and the angles formed by the optical axes of the second and third phase retardation films 131 and 133 and the absorption axis of the polarizing substrate 120 are not within the above ranges, the inverse wavelength dispersion characteristics cannot be obtained.

It should be noted that, for the sake of fully explanation, the included angle between the optical axis of the third retardation film 133 and the absorption axis of the polarizing substrate 120 is 67.5 ° -82.5 ° (if the included angle between the two is represented by an obtuse angle, the included angle ranges from 97.5 ° to 112.5 °). Similarly, the included angle between the optical axis of the second phase retardation film 131 and the absorption axis of the polarizing substrate 120 may be represented by an acute angle or an obtuse angle, which is not particularly limited, and for the sake of fully explanation, the included angle between the optical axis of the second phase retardation film 131 and the absorption axis of the polarizing substrate 120 is represented by an acute angle, so that the included angle between the two is 7.5 ° -22.5 ° (if the included angle between the two is represented by an obtuse angle, the included angle ranges from 157.5 ° to 172.5 °).

Preferably, the angle of the acute angle formed between the optical axis of the third retardation film 133 and the absorption axis of the polarizing substrate 120 is 70 ° -80 ° (if the angle therebetween is expressed as an obtuse angle, the angle ranges from 100 ° -110 °).

Preferably, the acute angle formed between the optical axis of the second phase retardation film 131 and the absorption axis of the polarizing substrate 120 is 10 ° to 20 ° (if the angle therebetween is represented by an obtuse angle, the angle is in the range of 160 ° to 170 °).

In the present embodiment, the circular polarizer 100 can obtain the inverse wavelength dispersion characteristics by limiting the in-plane phase difference values of the first, third and second phase retardation films 112, 133 and 131 and the angle between the absorption axis of the polarizing substrate 120.

Referring to fig. 2 and 3, in an embodiment of the application, the phase compensation layer further includes a C-plate liquid crystal viewing angle compensation film 134, and the C-plate liquid crystal viewing angle compensation film 134 is disposed between the second phase retardation film 131 and the lower TAC layer 132 or between the lower TAC layer 132 and the third phase retardation film 133 in the phase compensation layer 130; alternatively, the C-plate liquid crystal viewing angle compensation film 134 is provided on the upper surface or the lower surface of the phase compensation layer 130.

The C-plate liquid crystal viewing angle compensation film 134 is used to improve the viewing angle characteristics of the display.

The C-plate liquid crystal viewing angle compensation film 134 may be disposed between two adjacent layers of the phase compensation layer 130, and the C-plate liquid crystal viewing angle compensation film 134 may be stacked between the second phase retardation film 131 and the lower TAC layer 132, and the C-plate liquid crystal viewing angle compensation film 134 may be stacked between the lower TAC layer 132 and the third phase retardation film 133.

The position of the C-plate liquid crystal viewing angle compensation film 134 may be disposed outside the phase compensation layer 130, and the C-plate liquid crystal viewing angle compensation film 134 may be stacked outside the second phase retardation film 131, where the outside refers to a side of the second phase retardation film 131 not contacting the lower TAC layer 132; the C-plate liquid crystal viewing angle compensation film 134 may be laminated on the outer side of the third retardation film 133, which is the side of the third retardation film 133 not in contact with the lower TAC layer 132.

In the present embodiment, the viewing angle characteristics of the display are improved by providing the C-plate liquid crystal viewing angle compensation film 134.

In one embodiment of the present application, the C-plate liquid crystal viewing angle compensation film 134 is laminated between the lower TAC layer 132 and the third phase retardation film 133; the range of the phase difference value in the vertical plane of the C-plate liquid crystal viewing angle compensation film is 50nm-160nm.

In the present embodiment, the phase compensation layer 130 has the inverse wavelength dispersion characteristic and the wide angle compensation characteristic by the in-plane retardation range of the first phase retardation film 112, the third phase retardation film 133, the second phase retardation film 131 and the C-plate liquid crystal viewing angle compensation film 134 and the acute angle included angle range between the respective absorption axes of the polarizing substrate 120, and the range of the vertical in-plane retardation value of the C-plate liquid crystal viewing angle compensation film 134 is 50nm to 160nm, so that the phase compensation layer 130 has the good anti-reflection characteristic in the visible light wavelength range of the full-light domain and the anti-reflection characteristic for effectively eliminating the light reflection in the different viewing angles of the wide angle.

In one embodiment of the present application, the C-plate liquid crystal viewing angle compensation film 134 has a vertical in-plane phase difference value in the range of 60nm to 110nm.

In one embodiment of the present application, the C-plate liquid crystal viewing angle compensation film 134 has a vertical in-plane phase difference value in the range of 70nm to 110nm.

In one embodiment of the present application, the phase compensation layer 130 has a thickness of 1 micron to 25 microns.

The thickness of the phase compensation layer 130 provided in this embodiment is preferably 3 μm, and the thickness of the phase retardation film is thinner than that of the phase retardation film made of polymer material, so as to satisfy the requirement of thinning the display.

In one embodiment of the present application, the phase compensation layer 130 is a liquid crystal reverse dispersion film, the second phase retardation film 131 and the third phase retardation film 133 are both liquid crystal films having positive dispersion characteristics, and the C-plate liquid crystal viewing angle compensation film 134 is a liquid crystal film having in-plane vertical phase difference characteristics.

In this embodiment, the phase compensation layer 130 is a liquid crystal inverse dispersion film, that is, the phase compensation layer 130 is made of a liquid crystal material, and the liquid crystal material has better birefringence, so that the thin functional film can be formed on the premise of achieving the same optical retardation effect. Based on the thinned functional film, a thinned functional product, such as a laminated structure optical component with the thinned functional film and an OLED display product provided with the thinned functional film, can be obtained, and the thinned trend of a display device and the requirement of the flexible development of a flexible OLED display can be met. Therefore, the circular polarizer 100 provided by the embodiment of the application not only has the characteristic that the longer the wavelength is, the larger the phase difference value is, but also has the structural advantage of a thinned functional film.

It should be noted that, the phase compensation layer 130 provided in this embodiment is an inverse dispersion type liquid crystal film, that is, a film made of a liquid crystal material, and if the thickness of the film layer obtained by preparing the phase compensation layer 130 from other materials is thicker, for example, the thickness of the film layer prepared from a polymer material is up to 50 μm or more, it is difficult to meet the requirement of the optical device for thinner and thinner phase retardation film.

In one embodiment of the present application, the second phase retardation film 131 is a liquid crystal type a-plate phase retardation film, a liquid crystal type O-plate phase retardation film, or a liquid crystal type biaxial phase retardation film;

and/or;

the third phase retarder 133 is a liquid crystal type a-plate phase retarder, a liquid crystal type O-plate phase retarder, or a liquid crystal type biaxial phase retarder.

The preferred liquid crystal films of the above type all have in-plane retardation values, so that the composite films formed after combination can achieve the effect of inverse dispersion.

Namely, the scheme in the present embodiment includes:

the second phase retarder 131 and the third phase retarder 133 are both liquid crystal type a-plate phase retarders.

The second phase retarder 131 and the third phase retarder 133 are both liquid crystal type O-plate phase retarders.

The second phase retardation film 131 and the third phase retardation film 133 are both liquid crystal type biaxial phase retardation films.

The second phase retarder 131 is a liquid crystal type a-plate phase retarder, and the third phase retarder 133 is a liquid crystal type O-plate phase retarder.

The second phase retarder 131 is a liquid crystal type a-plate phase retarder, and the third phase retarder 133 is a liquid crystal type biaxial phase retarder.

The second phase retarder 131 is a liquid crystal type O-plate phase retarder, and the third phase retarder 133 is a liquid crystal type a-plate phase retarder.

The second phase retarder 131 is a liquid crystal type O-plate phase retarder, and the third phase retarder 133 is a liquid crystal type biaxial phase retarder.

The second phase retarder 131 is a liquid crystal type biaxial phase retarder, and the third phase retarder 133 is a liquid crystal type a-plate phase retarder.

The second phase retarder 131 is a liquid crystal type biaxial phase retarder, and the third phase retarder 133 is a liquid crystal type O-plate phase retarder.

In one embodiment of the present application, the materials of the third phase retardation film 133 and the second phase retardation film 131 are each independently selected from any one of the following: rod-like liquid crystals, discotic liquid crystals or rod-like liquid crystals doped with palm molecules.

In one embodiment of the present application, the material of the C-plate liquid crystal viewing angle compensation film 134 is solely selected from rod-shaped liquid crystals.

The phase compensation layer 130 prepared from the above material not only can provide the phase compensation layer 130 with a suitable optical axis angle, so that a suitable angle is formed between the phase compensation layer 130 and the absorption axis of the polarizing substrate 120, but also can provide the phase compensation layer 130 with inverse wavelength dispersion characteristics.

Preferably, the chiral molecules are doped in the chiral molecule doped rod-shaped liquid crystal in an amount of 0.005% to 2% by weight of the total chiral molecule doped rod-shaped liquid crystal. If the doping amount of the chiral molecules is too high, the proper optical axis angle of the phase compensation layer 130 is affected, which results in that the optical axis of the phase compensation layer 130 and the absorption axis of the polarizing substrate 120 form an angle range exceeding or lacking, and the phase compensation layer 130 with inverse wavelength dispersion characteristics cannot be obtained.

Preferably, the materials of the second phase retarder 131 and the third phase retarder 133 are selected from the rod-shaped liquid crystals LC242, LC1057 manufactured by BASF company, or from the rod-shaped liquid crystals RMS-03001, RMS-03011 manufactured by MERCK company. In another embodiment, the materials of the second phase retardation film 131 and the third phase retardation film 133 are selected from rod-shaped liquid crystal LC242 or LC1057 manufactured by BASF company and palm-shaped molecules LC756 manufactured by BASF company, or rod-shaped liquid crystal RMS-03001 manufactured by MERCK company and palm-shaped molecules LC756 manufactured by BASF company. The material of the C-plate liquid crystal viewing angle compensation film 134 is selected from a rod-shaped liquid crystal ROF7201 manufactured by Rolic company or a rod-shaped liquid crystal RMM-2190 manufactured by MERCK company.

As shown in fig. 4, in an embodiment of the present application, there is further provided an optical plate, including the circular polarizer in any one of the above embodiments, further including: a protective film 200, an adhesive layer 300, and a separation film 400; the protective film 200, the circular polarizer 100, the adhesive layer 300, and the separation film 400 are sequentially laminated; the protective film 200 is disposed above the circular polarizer 100, and is used for protecting the circular polarizer 100, the adhesive layer 300 is coated on the circular polarizer 100, and is used for adhering to the display substrate, and the separation film 400 is adhered to the adhesive layer 300, and is used for protecting the adhesive layer 300.

In an embodiment of the present application, there is also provided an application apparatus of an optical plate, where the application apparatus of an optical plate includes the circular polarizer 100 according to any one of the above embodiments.

For example, the application device of the optical sheet may include a cholesteric liquid crystal brightness enhancing film and the circular polarizer 100 described above.

The optical assembly composed of the cholesteric liquid crystal brightness enhancement film and the circular polarizer 100 can be applied to a liquid crystal display or an Organic Light Emitting Diode (OLED) display to improve the overall brightness enhancement efficiency, reduce the wide-angle chromatic aberration, and improve the natural light reflection. Similarly, the application device of the optical plate provided by the embodiment of the application can replace the existing corresponding optical component and is used for the known structure and device.

In an embodiment of the present application, there is also provided a method for preparing a circular polarizer, at least including a phase compensation layer 130, the phase compensation layer 130 including a second phase retardation film 131, a C-plate liquid crystal viewing angle compensation film 134, a lower TAC layer 132, and a third phase retardation film 133 laminated in this order, the method for preparing the phase compensation layer 130 including at least the steps of:

s1, preparing an alignment coating, a positive dispersion liquid crystal coating and a C-plate liquid crystal coating;

S2, the lower TAC layer 132 is provided with two opposite surfaces, the alignment paint is coated on the upper side of the lower TAC layer 132 and then dried and subjected to linear polarized UV curing, or the alignment paint is coated on the upper side of the lower TAC layer 132 and then dried and subjected to common UV curing, or the active paint is coated on the upper side of the lower TAC layer 132 and then dried and subjected to UV curing, and then the C-plate liquid crystal paint is coated on the upper side of the cured alignment paint or the active paint, so as to form the C-plate liquid crystal viewing angle compensation film 134.

S3, the lower TAC layer 132 is provided with two surfaces which are oppositely arranged, the alignment paint is coated below the lower TAC layer 132 and then dried and subjected to linear polarized UV curing, and the positive dispersion liquid crystal paint is coated above the cured alignment paint and then dried and subjected to UV curing, so that a third phase retardation film 133 is formed.

S4, coating the alignment paint on the upper side of the cured C-plate liquid crystal visual angle compensation film 134, drying and carrying out linear polarization UV curing, and coating the positive dispersion liquid crystal on the upper side of the cured alignment paint, drying and UV curing to form the second phase retardation film 131.

Accordingly, the technical problem that the second phase retardation film 131, the third phase retardation film 133 and the C-plate liquid crystal viewing angle compensation film 134 in the prior art are not firmly adhered to the lower TAC layer 132 and the problem that the alignment paint corrodes the lower TAC layer 132 are solved by the alignment paint in the preparation method of the present embodiment, and the formulation and the proportioning matters of the alignment paint are not disclosed in the present application. The problem of large thickness of the circular polaroid is solved in a coating mode, so that the circular polaroid produced is applicable to more scenes.

In order to understand the performance of the phase compensation layer 130, the present embodiment provides a method for manufacturing the phase compensation layer 130, which specifically includes the following steps:

preparing an alignment coating, a positive dispersion liquid crystal coating and a C-plate liquid crystal coating;

step two, preparing a second phase retardation film 131 and a third phase retardation film 133 by the following method:

s1: and providing an optical grade plastic base film and a liquid crystal material, and carrying out alignment treatment on the optical grade plastic base film.

S11, providing an optical grade plastic base film:

the material of the optical grade plastic base film includes a lower TAC layer 132 (Triacetate Cellulose, cellulose triacetate).

S12, providing a liquid crystal material:

the liquid crystal material is as before and will not be described in detail here.

S13, an alignment treatment method:

the two surfaces of the lower TAC layer 132 disposed opposite to each other are subjected to alignment treatment including, but not limited to, rubbing alignment and photo alignment. Since the photoalignment process can arbitrarily adjust the optical axis direction of the liquid crystal molecules, a roll-to-roll process can be used to obtain the second retarder 131 and the third retarder 133 having the desired optical axis direction (e.g., a polymer material is different from the retardation film prepared in this way), so that the productivity is improved.

S14, alignment and coating:

the lower TAC layer 132 has two sides disposed opposite to each other, and an alignment paint is coated on the upper side of the lower TAC layer 132 and then dried and subjected to linear polarized UV curing, or an alignment paint is coated on the upper side of the lower TAC layer 132 and then dried and subjected to general UV curing, and a C-plate liquid crystal paint is coated on the upper side of the cured alignment paint and then dried and UV-cured to form the C-plate liquid crystal viewing angle compensation film 134. The lower TAC layer 132 has two sides disposed opposite to each other, and an alignment paint is applied below the lower TAC layer 132 and then dried and subjected to linear polarized UV curing, and a positive dispersion liquid crystal paint is applied above the cured alignment paint and then dried and UV cured to form a third phase retarder film 133. The alignment paint is applied over the cured C-plate liquid crystal viewing angle compensation film 134 and then dried and subjected to linear polarized UV curing, and the positive dispersion liquid crystal is applied over the cured alignment paint and then dried and UV cured to form the second phase retarder film 131.

It should be noted that, when the materials of the second retardation film 131 and the third retardation film 133 are selected from rod-shaped liquid crystals doped with palm molecules, the liquid crystal molecules of the second retardation film 131 and the third retardation film 133 can be aligned along the optical axis direction by a rubbing alignment method, and the phase compensation layer 130 with inverse wavelength dispersion characteristics can be obtained by self-assembling adjustment to achieve the desired optical axis angle, and the circular polarizer 100 provided by the embodiment of the present application.

Step three: the C-plate liquid crystal viewing angle compensation film 134 was prepared as follows:

s31, providing an optical grade plastic base film and a liquid crystal material, and performing active treatment on the surfaces of the lower TAC layer 132, the third phase retardation film 133 or the second phase retardation film 131. Wherein the active treatment comprises ROM-201 active layer coating using ROLIC factory.

S32, depositing a C-plate liquid crystal material on the surface of the lower TAC layer 132, the third phase retardation film 133 or the second phase retardation film 131 after the activation treatment, and drying and UV light curing to obtain the transparent conductive film.

Step four: the phase compensation layer 130 formed by sequentially laminating and connecting the second phase retardation film 131, the lower TAC layer 132, the C-plate liquid crystal viewing angle compensation film 134, and the third phase retardation film 133 is optimized by a correction simulation method of the circular polarizer.

In an embodiment of the present application, a method for correcting and simulating a circular polarizer is provided, which is applicable to any one of the circular polarizers, and the method for correcting and simulating includes:

inputting a first parameter, constructing a Mueller matrix of the circular polaroid, using natural light to enter the circular polaroid, calculating a transmitted light error through ellipsometry, evaluating the performance under the current first parameter through an evaluation function to obtain an optimal value and an optimal parameter, calculating an emergent light path of the natural light, and calculating the ellipsometry of single transmitted light to evaluate the performance of preventing sunglasses from being closed;

And inputting a second parameter, calculating the transmitted light errors under the azimuth of different incident angles, calculating an evaluation function, counting the errors of the phase difference values in the vertical plane under different azimuth angles, and calculating the phase difference value and the corresponding parameter in the optimal vertical plane.

The first parameters comprise phase difference of each phase retardation film at different wavelengths, an included angle relative to a transmission axis of the polarizing matrix, refractive index and extinction coefficient of the polarizing matrix at different wavelengths and azimuth angle. The phase delay Mueller matrix is constructed by utilizing the phase difference and the included angle through the polarized light principle, the dichroism is calculated by utilizing the refractive index and the extinction coefficient, the dichroism Mueller matrix is constructed by combining the included angle, and the phase delay Mueller matrix and the dichroism Mueller matrix are utilized by utilizing the Lu-Chipman polar decomposition, so that the Mueller matrix of the circular polaroid is calculated. The second parameters include a range of phase difference values in the vertical plane, refractive index of the C-plate liquid crystal viewing angle compensation film, optimal parameters, and optimal evaluation function values. Because the second parameters are not more, the limitation of the actual engineering precision is not more, and the local optimal solution of the calculation result is too more, the global optimal value is found by using an exhaustion method.

Ellipticity of polarized light refers to the ratio of the amplitudes of the short and long axes of elliptically polarized light (the locus of elliptically polarized light is an ellipse, and the ratio of the short and long axes of the ellipse is ellipticity).

In this embodiment, the transmitted light is circularly polarized light when the ellipsometry is 1, linearly polarized light when the ellipsometry is 0, and in order to distinguish left and right rotations, additional processing is performed when calculating ellipsometry, and the inverse cosine transform is calculated for the original data to an angle in the range of 0 to 180 °,0 ° is right circularly polarized light, 90 ° is linearly polarized light, 180 ° is left circularly polarized light, and this value is named as "error".

In this example, the root mean square of all errors in the predetermined wavelength range was used as the evaluation function.

To improve efficiency, 550mm errors are calculated first, and after one pass of screening, the full band errors in the specified wavelength range are calculated again in a reduced range.

In this example, the smaller the general evaluation function, the better the performance, the closer the ellipsometry to 1, the better the performance of preventing sunglasses from closing.

Preferably, the step of calculating the phase difference value in the optimal vertical plane includes: and calculating a minimum evaluation function through the evaluation function value and the distribution condition, and analyzing the uniformity of the evaluation function to obtain the optimal phase difference value in the vertical plane.

Because of few input parameters, limitation of actual engineering precision and excessive local optimal solutions of calculation results, an exhaustive method is used for searching a global optimal value.

For convenience of explanation, the above-described simulation generation method and the generated phase compensation layer 130 and the optical properties of the finally formed circular polarizer 100 will be described in detail by respectively listing examples and comparative examples in combination with the graph or the broken line analysis diagrams in fig. 5 to 12.

Example 1

The adopted phase compensation layer 130 is a liquid crystal type inverse dispersion composite quarter-phase retardation film, which comprises a second phase retardation film 131 and a third phase retardation film 133 which are coated and laminated on the front and back surfaces of the lower TAC layer 132, wherein the in-plane phase difference value of the third phase retardation film 133 is 100nm to 150nm, the acute angle formed by the optical axis of the third phase retardation film 133 and the absorption axis of the polarizing substrate 120 is 67.5 DEG to 82.5 DEG, the in-plane phase difference value of the second phase retardation film 131 is 210nm to 290nm, and the acute angle formed by the optical axis of the second phase retardation film 131 and the absorption axis of the polarizing substrate 120 is 7.5 DEG to 22.5 deg.

Example 2

The circular polarizer 100 is used, which includes a filter layer 110, a polarizing substrate 120, and a phase compensation layer 130, wherein the phase compensation layer 130 is a liquid crystal type inverse dispersion composite quarter-phase retardation film. The phase compensation layer 130 includes a second phase retardation film 131 and a third phase retardation film 133 laminated and combined on the front and rear surfaces of a lower TAC layer 132, and the polarizing substrate 120 is laminated on a side of the second phase retardation film 131 away from the third phase retardation film 133. The in-plane phase difference value of the third phase retarder 133 is 100nm to 150nm, the acute angle formed by the optical axis of the third phase retarder 133 and the absorption axis of the polarizing substrate 120 is 67.5 ° to 82.5 °, the in-plane phase difference value of the second phase retarder 131 is 210nm to 290nm, and the acute angle formed by the optical axis of the second phase retarder 131 and the absorption axis of the polarizing substrate 120 is 7.5 ° to 22.5 °.

Example 3

The circular polarizer 100 is adopted, and comprises a filter layer 110, a polarizing matrix 120 and a phase compensation layer 130, wherein the phase compensation layer 130 is a liquid crystal type inverse dispersion composite type quarter-phase retardation film, the phase compensation layer 130 comprises a second phase retardation film 131, a C-plate liquid crystal visual angle compensation film 134 and a third phase retardation film 133 which are coated and laminated on the front and back surfaces of a lower TAC layer 132, and the polarizing matrix 120 is laminated on one side of the second phase retardation film 131 far away from the third phase retardation film 133; the C-plate liquid crystal viewing angle compensation film 134 is disposed between the second phase retardation film 131 and the lower TAC layer 132. The in-plane phase difference value of the third phase retardation film 133 is 100nm to 150nm, and the acute angle formed by the optical axis of the third phase retardation film 133 and the absorption axis of the polarizing substrate 120 is 67.5 ° to 82.5 °; the in-plane phase difference value of the second phase retardation film 131 is 210nm to 290nm; and the acute angle formed by the optical axis of the second phase retardation film 131 and the absorption axis of the polarizing substrate 120 is 7.5 ° to 22.5 °; the vertical in-plane retardation of the C-plate liquid crystal viewing angle compensation film 134 is 50nm to 160nm.

Example 4

The filter layer 110 is a liquid crystal type forward dispersion quarter-phase retardation film, which includes a first retardation film 112 coated on the front and rear surfaces of the TAC layer 111, the in-plane phase difference of the first retardation film 112 is 120nm to 160nm, and the acute angle formed between the optical axis of the first retardation film 112 and the absorption axis of the polarizing substrate 120 is 40 ° to 50 °.

Comparative example 1

Comparative example 1 specifically provides a quarter-phase retarder (hereinafter referred to as a conventional known quarter-phase retarder) which is a single-layer film preferably using a polymer extended quarter-phase retarder of model RM 147.

Comparative example 2

Comparative example 2 specifically provides a quarter-wave retarder (hereinafter referred to as a conventional known quarter-wave retarder) which is a single layer film preferably using a polymer stretched quarter-wave retarder of the type GR 138.

Referring to table 1, table 1 shows that the comparison of the ellipsometry data of the bonded linear polarizers in example 4 and comparative example 2 of the correction simulation method provided by the present application shows that the compensation effect of Sunglass Free is better as the full-wavelength ellipsometry approaches to the value 1, and the full-wavelength ellipsometry of example 4 is more biased toward the value 1 than the full-wavelength ellipsometry of comparative example 2, as shown in fig. 5, and the effect is better.

TABLE 1

The theoretical calculation value, the actual sample measurement value and the wavelength dispersion of the liquid crystal type inverse dispersion phase compensation layer 130 provided in example 1 were compared with those of the conventional known quarter-turn inverse dispersion phase retardation film, and the errors of the phase difference calculation of the three were compared, and the wavelength dispersion and the error are plotted as shown in fig. 6 and 7. Wherein the horizontal axis is wavelength, the wavelength range is selected from 400nm to 700nm, and the vertical axis is in-plane phase difference value and error. As can be seen from fig. 6, the in-plane phase difference value of the liquid crystal type inverse dispersion phase compensation layer 130 of embodiment 1 has the highest coincidence between the phase difference in the full band and the theoretical value, and is superior to the conventional known quarter-wave inverse dispersion phase retardation film, especially in the blue and green bands. The actual sample simulation generated and fabricated according to example 1 has a value close to the theoretical calculation value, and the structural scheme of example 1 has feasibility and can guide actual production. The theoretical calculation value and the actual measurement value of the comparative example 1 are compared, and errors are calculated, so that the deviation of the actual sample in the blue light wave band is maximum, and the reflectivity of the actual sample in the blue light wave band is expected to be larger than the theoretical calculation value.

As shown in fig. 6, the upper right corner in the drawing is illustrated in the order from top to bottom, the uppermost solid line is an ideal value, the next solid line is a theoretical simulation value of example 1, the next broken line is a measured fitting value of example 1, and the lowermost chain line is a measured fitting value of comparative example 1.

After the known quarter-reverse dispersion phase retardation film provided in comparative example 1 was attached to the polarizing substrate 120, the same as the circular polarizer 100 provided in example 2 of the present application was attached to an OLED panel, respectively, and a positive angle reflectance test was performed, and a reflectance spectrum is shown in fig. 8. Wherein the horizontal axis is wavelength, the vertical axis is reflectivity R%, the measurement device is CS-580 spectrocolorimeter, and the wavelength range is 380nm to 780nm. As can be seen from fig. 7, the reflectance of example 2 was lower than that of comparative example 1 after the linearly polarized substrate 120 was bonded in the blue-green wavelength band of 550nm or less, and the reflectance measured value of the actual sample of example 2 was larger than the theoretical calculated value in the blue wavelength band of 500nm or less.

Both of the above conclusions are in line with theoretical predictions. Meanwhile, the known quarter-wave retarder film of comparative example 1 and the liquid crystal phase compensation layer 130 of example 1 of the present application both have the inverse wavelength dispersion characteristic similar to the trend of ideal wavelength dispersion, so that the known quarter-wave retarder film and the phase compensation layer 130 can both approach the ideal phase difference value in the visible wavelength range, but the liquid crystal phase compensation layer 130 of example 1 of the present application has the ideal phase difference value more similar to the visible wavelength range than the known quarter-wave retarder film of comparative example 1, so that the anti-reflection effect better than the known quarter-wave retarder film of comparative example 1 can be obtained and the average reflectivity R% is smaller. In embodiment 1 of the present application, the ultra-thin wide-wave-domain circular polarizing plate composed of the phase compensation layer 130 and the polarizing substrate 120 has a reflectivity of 4% to 6% in the visible light wavelength region 400nm to 700nm, that is, the ultra-thin wide-wave-domain circular polarizing plate provided by the embodiment of the present application has a good anti-reflection effect.

Error was calculated after attaching the circular polarizer 100 provided in example 2 to the C-plate liquid crystal viewing angle compensation film 134, and the ratio of the error to the average error is shown in fig. 9 to 11. The ratio in the figure is the ratio of the data quantity of the current error to the whole data quantity. The extremum of each curve in the graph is marked by a circle and the current phase difference value in the vertical plane is marked, wherein one extremum exists in the condition that a plurality of phase difference values in the vertical plane correspond to each other, namely, the condition that the extremum exists in parallel to the phase difference value axis in the vertical plane, and the middle value of the phase difference values in the vertical plane is marked. As can be seen from fig. 9 to 11, the case where the C-plate liquid crystal viewing angle compensating film 134 is located between the second phase retarder 131 and the third phase retarder 133 is optimal, and compared with other positions, the minimum value of the average error of the C-plate liquid crystal viewing angle compensating film 134 is lowest when it is located between the second phase retarder 131 and the third phase retarder 133, the average value of the standard deviation of the error is smallest, the error ratio is largest, and the ratio of the error of 15 ° or less can be close to 100%. As can be seen from fig. 10, the average error minimum is at 73nm in the vertical plane, while the phase difference in the vertical plane is suitably selected to be between 60 and 90nm in consideration of uniformity of the error ratio.

In fig. 9, the upper right corner region is illustrated in the order from top to bottom, and the uppermost is a duty curve having an error of 15 ° or less, the next is a duty curve having an error of 10 ° or less, and the lowermost is a duty curve having an error of 8 ° or less.

In fig. 10, the upper right corner region is illustrated in the order from top to bottom, and the uppermost is a duty curve having an error of 15 ° or less, the next is a duty curve having an error of 10 ° or less, and the lowermost is a duty curve having an error of 8 ° or less.

In fig. 11, the upper right corner region is illustrated in the order from top to bottom, and the uppermost is a duty curve having an error of 15 ° or less, the next is a duty curve having an error of 10 ° or less, and the lowermost is a duty curve having an error of 8 ° or less.

The known quarter-turn reverse-dispersion phase retardation film provided in comparative example 1 was attached to the polarizing substrate 120 and the circular polarizer 100 provided in example 3, respectively, were attached to the OLED panel, and a large viewing angle reflectance test was performed and the reflectance Y of the full-band luminous flux was calculated. The calculation of the brightness reflectivity Y adopts a calculation method of a green primary stimulus value Y in the CIE 15:Technical Report:Colorimetry,3rd edition standard, and the green primary stimulus value Y is equivalent to the reflectivity of luminous flux in a visible light band because a green color matching function is consistent with a spectral light efficiency function of human eyes. The reflectance graph is shown in fig. 12. Wherein, the polar axis is the luminous flux reflectivity Y%; the polar angle is the azimuth angle of the sample, the azimuth angle is defined as the included angle from the horizontal line to the absorption axis of the sample, and the anticlockwise direction is positive; the measuring equipment is manufactured by Solid Spec-3700 spectroscope Shimadzu corporation, model: solid Spec-3700, the wavelength range is 380nm to 780nm. As can be seen from fig. 12, after the C-plate liquid crystal viewing angle compensation film 134 is added, the large viewing angle reflectivity of example 3 is significantly smaller than that of the polarizing substrate 120 laminated with example 2 and comparative example 1, and thus the C-plate liquid crystal viewing angle compensation film 134 has a significant effect of reducing the reflectivity at a large viewing angle.

As shown in fig. 12, each folding line is illustrated in the order direction of the vertices from the outside to the inside on the middle vertical line in the drawing, and the measured value of example 3 is the outermost one, and next, the measured value of the polarizing substrate 120 is bonded to the comparative example 1, and the measured value of example 3 is the innermost one. Wherein the upper half is at an angle of incidence of 45 ° and the lower half is at an angle of incidence of 60 °.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.

Claims

1. A circular polarizer, wherein the circular polarizer comprises:

a filter layer including an upper TAC layer and a first phase retardation film coated on an inner peripheral side of the upper TAC layer;

a polarizing substrate;

the phase compensation layer comprises a second phase delay film, a lower TAC layer and a third phase delay film, wherein the second phase delay film is coated on the upper surface of the lower TAC layer, and the third phase delay film is coated on the lower surface of the lower TAC layer;

wherein the filter layer, the polarizing substrate and the phase compensation layer are sequentially laminated and connected;

The first phase delay film and the third phase delay film are quarter-phase delay films, and the second phase delay film is a half-phase delay film.

2. The circular polarizer of claim 1, wherein: the included angle of the acute angle between the optical axis of the first phase retardation film and the absorption axis of the polarizing matrix is 40-50 degrees, and the range of the in-plane phase difference value of the first phase retardation film is 120-160 nm;

the included angle of the acute angle between the optical axis of the second phase retardation film and the absorption axis of the polarizing substrate is 7.5-22.5 degrees, and the range of the in-plane phase difference value of the second phase retardation film is 210-290 nm;

the included angle of the acute angle between the optical axis of the third phase retardation film and the absorption axis of the polarizing substrate is 67.5-82.5 degrees, and the range of the in-plane phase difference value of the third phase retardation film is 100-150 nm.

3. The circular polarizer of claim 1, wherein: the phase compensation layer further comprises a C-plate liquid crystal viewing angle compensation film, wherein the C-plate liquid crystal viewing angle compensation film is arranged between the second phase retardation film and the lower TAC layer or between the lower TAC layer and the third phase retardation film in the phase compensation layer;

Or the C-plate liquid crystal visual angle compensation film is arranged on the upper surface or the lower surface of the phase compensation layer.

4. A circular polarizer according to claim 3, wherein: the C-plate liquid crystal visual angle compensation film is arranged between the lower TAC layer and the third phase retardation film;

the range of the phase difference value in the vertical plane of the C-plate liquid crystal visual angle compensation film is 50nm-160nm.

5. A circular polarizer according to claim 3, wherein: the range of the phase difference value in the vertical plane of the C-plate liquid crystal visual angle compensation film is 60nm-110nm.

6. A circular polarizer according to claim 3, wherein: the phase compensation layer is a liquid crystal inverse dispersion film, the second phase delay film and the third phase delay film are both liquid crystal films with positive dispersion characteristics, and the C-plate liquid crystal visual angle compensation film is a liquid crystal film with phase difference characteristics in a vertical plane.

7. The circular polarizer of claim 1, wherein: the thickness of the phase compensation layer is 1-25 micrometers.

8. The circular polarizer of claim 1, wherein: the second phase retardation film is a liquid crystal type A plate phase retardation film, a liquid crystal type O plate phase retardation film or a liquid crystal type double-shaft phase retardation film;

And/or the third phase retardation film is a liquid crystal type A plate phase retardation film, a liquid crystal type O plate phase retardation film or a liquid crystal type biaxial phase retardation film.

9. The preparation method of the circular polarizer is characterized in that the circular polarizer at least comprises a phase compensation layer, wherein the phase compensation layer comprises a second phase retardation film, a C-plate liquid crystal viewing angle compensation film, a lower TAC layer and a third phase retardation film which are sequentially laminated; the preparation method is used for preparing the phase compensation layer and at least comprises the following steps:

the alignment paint is coated on the upper surface of the lower TAC layer and is dried and subjected to linear polarization UV curing, or the alignment paint is coated on the upper surface of the lower TAC layer and is dried and subjected to common UV curing, or the active paint is coated on the upper surface of the lower TAC layer and is dried and subjected to drying curing, so that the C-plate liquid crystal viewing angle compensation film is formed; coating the alignment paint on the C-plate liquid crystal visual angle compensation film, drying and carrying out linear polarization UV curing, and then coating the positive dispersion liquid crystal paint on the C-plate liquid crystal visual angle compensation film, wherein the positive dispersion liquid crystal paint is dried and UV cured to form the second phase retardation film;

And coating the alignment coating on the lower surface of the lower TAC layer, drying and linearly polarized UV curing, coating the positive dispersion liquid crystal on the lower surface of the lower TAC layer, and drying and UV curing to form the third phase retardation film.

10. A method for simulating correction of a circular polarizer, which is applied to the circular polarizer according to any one of claims 1 to 8, comprising:

inputting a first parameter, constructing a Mueller matrix of the circular polarizer, using natural light to enter the circular polarizer, calculating a transmitted light error through ellipsometry, and evaluating the performance under the current first parameter through an evaluation function to obtain an optimal value and an optimal parameter; calculating ellipsometry of single transmitted light to evaluate the closing performance of the sunglasses;

inputting a second parameter, calculating the transmitted light errors under the azimuth of different incident angles, calculating an evaluation function, counting the evaluation function values and distribution conditions under different azimuth angles, and calculating the phase difference value and the corresponding parameter in the optimal vertical plane.

11. The method for simulating correction of a circular polarizer according to claim 10, wherein: the first parameters comprise phase differences of the phase retardation films at different wavelengths, included angles relative to the transmission axis of the polarizing matrix, refractive indexes, extinction coefficients and azimuth angles of the polarizing matrix at different wavelengths;

Constructing a phase delay Mueller matrix through the phase difference and the included angle;

calculating dichroism through the refractive index and the extinction coefficient, and constructing a dichroism Mueller matrix by combining the included angles;

and carrying the phase delay Mueller matrix and the dichroism Mueller matrix into polar decomposition to calculate the Mueller matrix of the circular polarizer.

12. The method for simulating correction of a circular polarizer according to claim 10 or 11, wherein: the second parameter includes a range of phase difference values in a vertical plane, a refractive index of a C-plate liquid crystal viewing angle compensation film, the optimum parameter, and an optimum evaluation function value.

13. The method for simulating correction of a circular polarizer according to claim 12, wherein: the step of calculating the phase difference value in the optimal vertical plane comprises the following steps:

and calculating a minimum evaluation function through the evaluation function values and the distribution conditions, and analyzing the uniformity of the evaluation function to obtain an optimal vertical in-plane phase difference value.