CN116184554B

CN116184554B - Optical plate, optical application piece and simulation generation method of optical plate

Info

Publication number: CN116184554B
Application number: CN202310203902.4A
Authority: CN
Inventors: 裴晓明; 邱大任; 姜旭枫; 洪溢凡
Original assignee: Zhejiang Yitiji Technology Co ltd
Current assignee: Zhejiang Yitiji Technology Co ltd
Priority date: 2023-03-01
Filing date: 2023-03-01
Publication date: 2024-02-20
Anticipated expiration: 2043-03-01
Also published as: CN116184554A

Abstract

The application provides an optical plate with a phase difference layer structure, an optical application piece and a simulation generation method of the optical plate, which comprises a laminated linear polarizing plate and a composite phase retardation film; the composite phase retardation film comprises a laminated quarter-phase retardation film and a laminated half-phase retardation film, and the linear polarizing plate is laminated on one side of the half-phase retardation film, which is away from the quarter-phase retardation film; the in-plane phase difference value Ro of the quarter-phase retardation film is 100nm to 150nm, and the acute angle between the optical axis of the quarter-phase retardation film and the absorption axis of the linear polarizing plate is 67.5 DEG to 82.5 DEG; the in-plane phase difference value Ro of the half-phase retardation film is 210nm to 290nm, and the acute angle between the optical axis of the half-phase retardation film and the absorption axis of the linear polarizing plate is 7.5 DEG to 22.5 deg.

Description

Optical plate, optical application piece and simulation generation method of optical plate

Technical Field

The present application relates to the field of optical elements, and more particularly, to an optical plate having a retardation layer structure and an optical application.

Background

In optical reflection and refraction applications, a quarter-phase retarder is an optical film that is 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, and the circularly polarized light can be directionally converted during reflection by a reflecting surface, for example, left circularly polarized light is converted into right circularly polarized light during reflection by the reflecting surface, and right circularly polarized light is converted into left circularly polarized light during reflection by the reflecting surface.

Because the metal electrode in the liquid crystal display device is extremely easy to reflect, the optical film material with the circular polarized light characteristic in the prior art is applied to the liquid crystal display device, so that the problem that the readability of a display screen is disturbed due to the fact that an external incident light source is incident to the liquid crystal display device is solved, and the special anti-reflection effect is achieved through the optical film material with the circular polarized light characteristic.

A prior art example is provided below as an illustration.

The external natural light is firstly incident into a linear polarizing plate in the display, the natural light is converted into first linear polarized light through the linear polarizing plate, the first linear polarized light is converted into left-handed circularly polarized light through a quarter-phase delay film, the left-handed circularly polarized light is reflected by a metal electrode and then is converted into right-handed circularly polarized light, when the right-handed circularly polarized light passes through the same quarter-phase delay film, the right-handed circularly polarized light is converted into second linear polarized light perpendicular to the original vibration direction, namely, the directions of the second linear polarized light and the first linear polarized light are perpendicular to each other, and then the second linear polarized light cannot be absorbed through the linear polarizing plate, so that the anti-reflection effect of eliminating the interference of an external incident light source of the liquid crystal display device is finally achieved, and the problem of reflection of the liquid crystal display device under the natural light is solved.

In the prior art, the quarter-phase retardation film is generally capable of performing ideal phase difference correction only for a single wavelength, for example, the conventional quarter-phase retardation film is capable of performing ideal phase difference correction only for a green light wavelength of 550 nm. The conventional quarter-phase retardation film has positive wavelength dispersion characteristics, i.e. the longer the wavelength is, the smaller the phase difference value is, so that the conventional quarter-phase retardation film cannot obtain ideal phase difference correction for red light waves and blue light waves, thereby causing the problem of light leakage. The conventional quarter-phase retardation film cannot compensate for a wide angle, so that the effect of phase difference correction thereof is deteriorated with an increase in viewing angle.

Disclosure of Invention

An objective of the present embodiment is to provide an optical plate with a phase difference layer structure, which has good anti-reflection properties in the visible light wavelength range of the full-light domain, so as to solve the problem of interference caused by the incident light source from the outside to the liquid crystal display device.

In order to achieve the above purpose, the technical scheme adopted in the application is as follows:

an optical plate with a phase difference layer structure is provided, and the optical plate is a circular polarized plate;

The optical plate comprises a linear polarizing plate and a composite phase retardation film which are stacked, wherein the composite phase retardation film is an inverse dispersion type film;

the composite phase retardation film at least comprises a quarter-phase retardation film and a half-phase retardation film which are laminated, wherein the linear polarizing plate is laminated on one side of the half-phase retardation film, which is away from the quarter-phase retardation film, and the quarter-phase retardation film and the half-phase retardation film are positive dispersion films;

and the in-plane phase difference value Ro of the quarter-phase retardation film ranges from 100nm to 150nm, and the acute included angle between the optical axis of the quarter-phase retardation film and the absorption axis of the linear polarizing plate ranges from 67.5 degrees to 82.5 degrees;

the in-plane phase difference value Ro of the half-phase retardation film ranges from 210nm to 290nm, and the acute angle included between the optical axis of the half-phase retardation film and the absorption axis of the linear polarizing plate ranges from 7.5 ° to 22.5 °.

In one embodiment, the composite phase retardation film further comprises a positive C-plate viewing angle compensation film;

the positive C-plate visual angle compensation film is laminated between the linear polarizing plate and the half-phase retardation film;

Or, the positive C-plate viewing angle compensation film is laminated between the quarter-phase retardation film and the half-phase retardation film;

or, the positive C-plate visual angle compensation film is laminated on one side of the quarter-phase retardation film, which is away from the half-phase retardation film.

the positive C-plate visual angle compensation film is laminated between the quarter-phase retardation film and the half-phase retardation film;

and the range of the in-plane retardation value Rth of the positive C-plate viewing angle compensation film is 50nm to 160nm.

In one embodiment, the positive C-plate viewing angle compensation film has a vertical in-plane retardation value Rth in a range of 60nm to 110nm.

In one embodiment, the composite phase retardation film further comprises a first adhesive layer and a second adhesive layer;

the first adhesive layer is laminated between the half-phase retardation film and the positive C-plate viewing angle compensation film, and the second adhesive layer is laminated between the quarter-phase retardation film and the positive C-plate viewing angle compensation film.

In one embodiment, the composite phase retardation film has a total thickness of 1 μm to 25 μm.

In one embodiment, the composite phase retardation film is a liquid crystal reverse dispersion film; wherein,

the quarter-phase retardation film is a liquid crystal film having a positive dispersion characteristic;

the half-phase retardation film is a liquid crystal film having a positive dispersion characteristic;

the positive C-plate visual angle compensation film is a liquid crystal film with vertical in-plane phase difference characteristic.

In one embodiment, the one-half phase retardation film and the one-quarter phase retardation film are both liquid crystal type a-plate phase retardation films;

or, the half-phase retardation film and the quarter-phase retardation film are both liquid crystal type O-plate phase retardation films;

or, the half-phase retardation film and the quarter-phase retardation film are both liquid crystal type biaxial retardation films;

or the half phase retardation film and the quarter phase retardation film are respectively a liquid crystal type A plate phase retardation film and a liquid crystal type O plate phase retardation film;

or the half phase retardation film and the quarter phase retardation film are respectively a liquid crystal type O plate phase retardation film and a liquid crystal type A plate phase retardation film;

or the half-phase retardation film and the quarter-phase retardation film are respectively a liquid crystal type A-plate phase retardation film and a liquid crystal type double-shaft phase retardation film;

Or the half-phase retardation film and the quarter-phase retardation film are respectively a liquid crystal type biaxial phase retardation film and a liquid crystal type A plate phase retardation film;

or the half-phase retardation film and the quarter-phase retardation film are respectively a liquid crystal type O-plate phase retardation film and a liquid crystal type biaxial phase retardation film;

or the half-phase retardation film and the quarter-phase retardation film are respectively a liquid crystal type biaxial retardation film and a liquid crystal type O-plate phase retardation film.

In one embodiment, the materials of the quarter-phase retardation film and the half-phase retardation film are each independently selected from any one of the following:

-a rod-like liquid crystal;

-discotic liquid crystals;

rod-shaped liquid crystals doped with palm-like molecules.

In one embodiment, the positive C-plate viewing angle compensation film is a liquid crystal type positive C-plate retardation film;

the material of the positive C-plate viewing angle compensation film is independently selected from any one of the following:

-a rod-like liquid crystal;

-discotic liquid crystals.

The application provides an optical plate who possesses phase difference layer structure's beneficial effect lies in:

compared with the prior art, the optical plate with the phase difference layer structure is used as a circular polarized plate, the composite phase retardation film at least comprises a quarter phase retardation film and a half phase retardation film which are laminated, the linear polarized plate is laminated on one side, deviating from the quarter phase retardation film, of the half phase retardation film, and the quarter phase retardation film and the half phase retardation film are positive dispersion films. And the in-plane phase difference value Ro of the quarter-phase retardation film ranges from 100nm to 150nm, and the acute angle included angle between the optical axis of the quarter-phase retardation film and the absorption axis of the linear polarizing plate ranges from 67.5 DEG to 82.5 DEG; and, the in-plane phase difference value Ro of the half-phase retardation film ranges from 210nm to 290nm, and the acute angle included angle between the optical axis of the half-phase retardation film and the absorption axis of the linear polarizing plate ranges from 7.5 DEG to 22.5 DEG, thereby imparting the inverse wavelength dispersion characteristic to the composite phase retardation film.

In other words, by the layer structure arrangement and the parameter range arrangement, the composite phase retardation film has the characteristic that the phase difference value is larger as the wavelength is longer, so that the composite phase retardation film has good anti-reflection property in the visible light wavelength range of the full light range, and the problem of interference caused by the incident light source of the outside is eliminated in the full light range.

Compared with the prior optical plate with the quarter-phase retardation film with positive dispersion characteristics, the optical plate with the phase difference layer structure has the reverse wavelength dispersion characteristics, so that the optical plate has good anti-reflection characteristics in the visible light wavelength range of the full light range. The optical plate is applied to the optical application part, so that the optical application part can effectively eliminate light reflection in any different visible light wavelength ranges, provide good compensation characteristics and solve the problem of interference caused by the incidence of an external incident light source to the liquid crystal display device in the full light range.

It is still another object of the present application to provide an optical application comprising an optical plate having a phase difference layer structure as described above.

The optical application piece that this application provided compares in prior art's beneficial effect and possess the optical plate piece that phase difference layer structure that this application provided compare in prior art's beneficial effect, and this is unnecessary here.

Another object of the present invention is to provide a method for generating a simulation of the optical plate having the retardation layer structure, the method comprising:

based on the polarization optical principle, calculating and obtaining a Mueller matrix of the quarter-phase retardation film, a Mueller matrix of the half-phase retardation film and a Mueller matrix of the positive C-plate visual angle compensation film; synthesizing the mueller matrix of the composite phase retardation film by utilizing a polar decomposition method based on the mueller matrix of the quarter-phase retardation film, the mueller matrix of the half-phase retardation film and the mueller matrix of the positive C-plate viewing angle compensation film; extracting phase difference information and angle information of the composite phase delay film according to a Mueller matrix of the composite phase delay film;

setting a set error value between the outgoing light which is transmitted through the composite phase retardation film (102) by the linearly polarized light according with the expected angle and the circularly polarized light according with the expected angle, and representing the difference between the composite phase retardation film and the ideal phase retardation film according to the error value;

Formulating an evaluation function according to requirements, calculating error values of all phase differences and angles, bringing the obtained error values into the evaluation function, and calculating the evaluation function to obtain an optimal solution combination meeting expectations according to convergence conditions of the evaluation function;

under the condition of normal incidence plane of the front view angle and under the specific wavelength, phase difference information of the quarter-phase retardation film, phase difference information of the half-phase retardation film and included angle information between the quarter-phase retardation film and the quarter-phase retardation film are obtained, a wavelength dispersion curve of the composite phase retardation film is obtained through calculation according to the phase difference information, the included angle information and delta n of materials, corresponding errors are obtained from the wavelength dispersion curve, and an evaluation function is calculated according to the errors so as to screen out a section near a function extreme value as a most optimal simulation reference value.

In one embodiment, the simulation generating method further includes:

selecting different Rth values and different position information aiming at the positive C-plate visual angle compensation film, calculating the different Rth values and the different position information based on the most preferable simulation reference value to obtain and count evaluation function values of each azimuth angle and incidence angle under the different Rth values and the different position information, and finally screening out the optimal Rth values and the optimal position information;

Wherein the different position information comprises any one of the following three different position information:

In one embodiment, setting a set angle difference between the integrated value of the angle and the circular phase retardation of the composite phase retardation film and the vibration direction of the incident linearly polarized light at a specific wavelength, defining a set error value between an actual angle difference and the set angle difference at any wavelength, deriving the actual angle difference according to the set angle difference and the set error value, generating a stereoscopic image according to the actual angle difference by simulation, and making the actual angle difference approach to the set angle difference in the simulation process, including:

setting the set angle difference between the integrated value of the optical axis angle and the circular phase delay of the composite phase delay film and the vibration direction of the incident linear polarized light to be 45 degrees under the anchoring wavelength of 550nm, and setting the Stokes vector of the incident linear polarized light of which the emergent light is the right-handed polarized light to be Sin;

And setting a normalized stokes vector of the transmitted light of Sin incident on the composite phase retardation film at any wavelength as Sout, defining the set error value as the inverse cosine of a fourth parameter of Sout, and deducing the actual angle difference required by simulation according to the set angle difference and the inverse cosine of the fourth parameter of Sout.

In one embodiment, under the condition of normal incidence plane of the front view angle and at a specific wavelength, obtaining phase difference information of the quarter-phase retardation film, phase difference information of the half-phase retardation film and angle information between the quarter-phase retardation film and the quarter-phase retardation film, calculating according to the phase difference information, the angle information and Δn of a material to obtain a wavelength dispersion curve of the composite phase retardation film, obtaining a corresponding error from the wavelength dispersion curve, and screening out a function extremum section as a most preferable simulation reference value according to an error calculation evaluation function, including:

under the condition of normal incidence plane of a positive viewing angle and at 550nm wavelength, selecting one value in the interval range of 0-180 DEG and 0.1-5 DEG of each interval of the phase difference interval as a wavelength dispersion curve of the actual simulation required phase difference, and calculating the corresponding phase difference; selecting a wavelength interval with the lower limit of 380nm to 400nm and the upper limit of 700nm to 780nm, calculating corresponding error values by combining the wavelength dispersibility values of the currently selected phase difference at each wavelength interval of 5nm, and calculating the evaluation function for all the error values to screen out the material structure and the numerical combination of the extreme value of the evaluation function.

In one embodiment, the selecting different Rth values and different position information for the positive C-plate viewing angle compensation film, calculating the different Rth values and the different position information based on the most preferred analog reference values, obtaining an error polar coordinate graph of all-band full azimuth angles under the different Rth values and the different position information, counting average values of angle error values and full azimuth angle errors under different setting ranges, and finally screening out the optimal Rth values and the optimal position information, including:

under the anchoring 550nm wavelength, selecting different Rth values from one value of 0.1 to 10nm at intervals in a range of 0 to 150nm, selecting one piece of position information from the three pieces of position information, selecting different oblique incidence angles from one value of 0.1 to 15 at intervals in a range of 0 to 85 DEG at the lower limit of the incidence angle range and 70 to 85 DEG at the upper limit, selecting different azimuth angles from one value of 0.1 to 15 DEG at intervals in a range of 0 to 180 DEG or 0 to 360 DEG at intervals, and selecting different wavelengths from 5nm at intervals in a range of 380 to 400nm at the lower limit and 700 to 780nm at the upper limit of the wavelength range;

based on the selected values, refractive index data is obtained by utilizing light rate body calculation, and a phase difference formula deduced from the optical relation of birefringence under oblique incidence is combined to calculate a Mueller matrix of 5 parameters such as Rth value, position, wavelength, incidence angle and azimuth angle;

Calculating the errors of different wavelengths under the same group of Rth values, positions, incident angles and azimuth angles and calculating the evaluation function;

and counting the distribution condition of the evaluation function value at different azimuth angles, obtaining the dispersion degree, maximum value, minimum value and other statistical data of the evaluation function value at different azimuth angles under different Rth values, and finally screening out the optimal Rth value and the optimal position information according to the trend of the evaluation function value changing along with the Rth value.

The simulation generation method of the optical plate with the phase difference layer structure has the beneficial effects that:

compared with the prior art, the simulation generation method of the optical plate with the phase difference layer structure has the advantages that the finally obtained lamination position information of the linear polarizing plate, the quarter-phase retardation film and the quarter-phase retardation film, the range of an in-plane phase difference value Ro of the quarter-phase retardation film is 100nm to 150nm, the range of an acute angle included angle between an optical axis of the quarter-phase retardation film and an absorption axis of the linear polarizing plate is 67.5 DEG to 82.5 DEG, the range of an in-plane phase difference value Ro of the half-phase retardation film is 210nm to 290nm, the range of an acute angle included angle between an optical axis of the half-phase retardation film and the absorption axis of the linear polarizing plate is 7.5 DEG to 22.5 DEG, and the like, and the composite phase retardation film has inverse wavelength dispersion characteristics.

In other words, by simulating the layer structure setting position information and parameter range setting, the composite phase retardation film has the characteristic that the longer the wavelength is, the larger the phase difference value is, so that the optical plate 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 liquid crystal display device is solved in the full light domain.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for 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 schematic cross-sectional view of a layer structure of an optical plate having a retardation layer structure according to an embodiment of the present disclosure;

fig. 2 is a graph of the wavelength dispersion relationship of the composite quarter-phase retardation film provided in example 1 of the present application with the known quarter-phase retardation film provided in comparative example 1;

fig. 3 is an error plot of the composite quarter-phase retardation film provided in example 1 of the present application versus the known quarter-phase retardation film provided in comparative example 1;

FIG. 4 is a reflectance spectrum of a known quarter-phase retarder-bonded linear polarizer provided in example 2 of the present application and comparative example 1;

FIG. 5 is a graph of error ratios for different Rth values for a positive C-plate viewing angle compensation film disposed between a half-phase retardation film and a quarter-phase retardation film;

FIG. 6 is an average error plot of different Rth values for a positive C-plate viewing angle compensation film disposed between a half-phase retarder and a quarter-phase retarder;

FIG. 7 is a graph of error ratios for different Rth values for a positive C-plate viewing angle compensation film disposed between a quarter-phase retarder film and an OLED panel;

fig. 8 is an average error map of different Rth values for a positive C-plate viewing angle compensation film disposed between a quarter-phase retarder film and an OLED panel.

Fig. 9 is an error ratio graph of different Rth values of a positive C-plate viewing angle compensation film disposed between a half-phase retardation film and a linear polarizing plate;

fig. 10 is an average error map of different Rth values of a positive C-plate viewing angle compensation film disposed between a half-phase retardation film and a linear polarizing plate;

FIG. 11 is a graph of the luminous flux reflectivity of an optical sheet according to example 2 of the present application and a known quarter-phase retarder laminated to a linear polarizer according to comparative example 1;

Fig. 12 is a luminous flux reflectance spectrum of the optical sheet provided in example 3 of the present application and the known quarter-phase retardation film-laminated linear polarizing plate provided in comparative example 1.

Wherein, each reference sign in the figure:

100. an optical plate;

101. a linear polarizing plate; 102. a composite phase retardation film;

102a, a positive C-plate viewing angle compensation film; 102b, a quarter-phase retardation film; 102c, half phase retardation film.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present 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 present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The optical plate 100 having the retardation layer structure, the optical application, and the simulation generation method of the optical plate 100 provided in the embodiment of the present application will now be described.

Referring to fig. 1, an optical plate 100 provided with a phase difference layer structure according to an embodiment of the present application is shown in fig. 1, which illustrates the layer structure of the optical plate 100 in a longitudinal section along the stacking direction of the optical plate 100. In a specific application, the optical plate 100 provided with the retardation layer structure according to the embodiments of the present application is applied as a circularly polarizing plate.

Specifically, the optical sheet 100 described above includes a linearly polarizing plate 101 and a composite phase retardation film 102 which are stacked, and the composite phase retardation film 102 is an inverse-dispersion type quarter-phase retardation film 102b.

The composite retardation film 102 includes at least a laminated quarter-phase retardation film 102b and a laminated half-phase retardation film 102c, and the linear polarizer 101 is laminated on a side of the half-phase retardation film 102c facing away from the quarter-phase retardation film 102b, and the quarter-phase retardation film 102b and the half-phase retardation film 102c are both positively dispersed films.

And, the in-plane phase difference value Ro of the quarter-phase retardation film 102b ranges from 100nm to 150nm, and the acute angle included between the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizing plate 101 ranges from 67.5 ° to 82.5 °.

And, the in-plane phase difference value Ro of the half-phase retardation film 102c ranges from 210nm to 290nm, and the acute angle included between the optical axis of the half-phase retardation film 102c and the absorption axis of the linear polarizing plate 101 ranges from 7.5 ° to 22.5 °.

The optical plate 100 with the phase difference layer structure provided in the embodiment of the application is used as a circular polarizing plate, and the composite phase retardation film 102 has the characteristic that the phase difference value is larger as the wavelength is longer through the layer structure arrangement and the parameter range arrangement, so that the composite phase retardation film 102 has good anti-reflection characteristics in the visible light wavelength range of the full-light domain, and the problem that the interference is caused when the external incident light source is incident to the liquid crystal display device is solved in the full-light domain.

Compared with the conventional optical plate 100 using the quarter-phase retardation film 102b with positive dispersion characteristics, the optical plate 100 with the phase difference layer structure provided by the application has the inverse wavelength dispersion characteristics, so that the optical plate 100 has good anti-reflection characteristics in the visible light wavelength range of the full light range.

The optical plate 100 is applied to an optical application member, so that the optical application member can effectively eliminate light reflection in any different visible light wavelength ranges, provide good compensation characteristics, and solve the problem that an external incident light source is incident to a liquid crystal display device to cause interference in a full light range and a wide angle.

When the in-plane phase difference Ro between the half-phase retardation film 102c and the quarter-phase retardation film 102b, and the acute angle formed between the optical axes of the half-phase retardation film 102c and the quarter-phase retardation film 102b and the absorption axis of the linear polarizing plate 101 are not within the above-mentioned ranges, the inverse wavelength dispersion characteristic cannot be obtained.

And, it should be noted that, the angle formed between the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizer 101 may be represented by an acute angle or an obtuse angle. The included angle between the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizer 101 is represented by an acute angle, but the included angle between the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizer 101 is represented by an obtuse angle, which is also within the scope of the present application, i.e. the obtuse angle formed by the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizer 101 is 97.5 ° to 112.5 °. It is preferable that the acute angle between the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizing plate 101 is in the range of 70 ° to 80 °, and the angle between the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizing plate 101 is characterized by an obtuse angle, that is, an obtuse angle formed by both is 100 ° to 110 °.

The angle formed between the optical axis of the half-phase retardation film 102c and the absorption axis of the linear polarizing plate 101 may be represented by an acute angle or an obtuse angle. The embodiment of the present application uses an acute angle to represent the included angle between the optical axis of the half-retardation film 102c and the absorption axis of the linear polarizer 101, but uses an obtuse angle to represent the included angle between the optical axis of the half-retardation film 102c and the absorption axis of the linear polarizer 101, which is also within the scope of the present application, that is, the obtuse angle formed by the optical axis of the half-retardation film 102c and the absorption axis of the linear polarizer 101 is 157.5 ° to 172.5 °. It is preferable that the acute angle between the optical axis of the half-phase retardation film 102c and the absorption axis of the linear polarizing plate 101 is in the range of 10 ° to 20 °, and the angle between the optical axis of the half-phase retardation film 102c and the absorption axis of the linear polarizing plate 101 is characterized by an obtuse angle, that is, the obtuse angle formed by both is 160 ° to 170 °.

In one embodiment, the composite phase retardation film 102 further includes a positive C-plate viewing angle compensation film 102a, the positive C-plate viewing angle compensation film 102a being laminated between the linear polarizing plate 101 and the half-phase retardation film 102C; or, the positive C-plate viewing angle compensation film 102a is laminated between the quarter-phase retardation film 102b and the half-phase retardation film 102C; or, the positive C-plate viewing angle compensation film 102a is laminated on a side of the quarter-phase retardation film 102b facing away from the half-phase retardation film 102C.

In a preferred embodiment, the positive C-plate viewing angle compensation film 102a is laminated between the quarter-phase retardation film 102b and the half-phase retardation film 102C; and, the in-vertical plane retardation value Rth of the positive C-plate viewing angle compensation film 102a ranges from 50nm to 160nm.

In combination with the above-described parameter settings of the quarter-phase retardation film 102b and the half-phase retardation film 102C, the in-plane retardation value Ro of the quarter-phase retardation film 102b ranges from 100nm to 150nm, the acute angle between the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizing plate 101 ranges from 67.5 ° to 82.5 °, and the in-plane retardation value Ro of the half-phase retardation film 102C ranges from 210nm to 290nm, the acute angle between the optical axis of the half-phase retardation film 102C and the absorption axis of the linear polarizing plate 101 ranges from 7.5 ° to 22.5 °, and the in-vertical plane retardation value Rth of the positive C-plate viewing angle compensation film 102a ranges from 50nm to 160nm, whereby the composite phase retardation film 102 is endowed with both of good antireflection characteristics in the visible wavelength range of the full-light domain and antireflection characteristics in the wide angle compensation characteristics, and has antireflection characteristics effective in the wide angle.

The optical plate 100 with the phase difference layer structure provided in this embodiment, through the above layer structure arrangement and parameter range arrangement, makes the composite phase retardation film 102 have the characteristic that the longer the wavelength is, the larger the phase difference value is, and the wide angle compensation characteristic, so that the composite phase retardation film 102 has good anti-reflection characteristics in the visible light wavelength range of the full light domain, and has good anti-reflection characteristics in different viewing angles of the wide angle, so as to solve the problem of interference caused by the incident light source incident to the liquid crystal display device in the full light domain and the wide angle.

In a further preferred embodiment, the in-plane retardation value Rth of the normal C-plate viewing angle compensating film 102a is in the range of 60nm to 110nm, preferably 70nm to 110nm. The optical plate 100 is applied to an optical application member, so that the optical application member can effectively eliminate light reflection in any different visible wavelength ranges and any different viewing angles, provide good compensation characteristics, and solve the problem of interference caused by the incident light source from the outside to the liquid crystal display device in the full light range and wide angle.

In one embodiment, the composite phase retardation film 102 further includes a first adhesive layer and a second adhesive layer; the first adhesive layer is laminated between the half-phase retardation film 102C and the positive C-plate viewing angle compensation film 102a, and the second adhesive layer is laminated between the quarter-phase retardation film 102b and the positive C-plate viewing angle compensation film 102 a.

On the basis of the above embodiment, an adhesive layer (not shown in fig. 1) is provided between the quarter-phase retardation film 102b and the positive C-plate viewing angle compensation film 102a and between the half-phase retardation film 102C and the positive C-plate viewing angle compensation film 102a, so that the bonding force between the quarter-phase retardation film 102b and the positive C-plate viewing angle compensation film 102a and between the half-phase retardation film 102C and the positive C-plate viewing angle compensation film 102a can be better improved, and the service life of the composite phase retardation film 102 can be improved.

The material of the adhesive layer is not strictly limited, and includes, but is not limited to, UV glue, optically Clear Adhesive (OCA), liquid Optically Clear Adhesive (LOCA), or Pressure Sensitive Adhesive (PSA). The thickness of the adhesive layer may be selected according to the thickness of the reverse dispersion type quarter-phase retardation film 102b and the material of the adhesive layer. Specifically, the thickness of the adhesive layer may be between 50nm and 15 μm, and it is preferable that the thickness of the composite phase retardation film 102 is not more than 25 μm. Even if the composite phase retardation film 102 includes an adhesive layer, it has a small thickness, and thus a thin film can be achieved.

In one embodiment, the composite phase retardation film 102 is a liquid crystal inverse dispersion film; the quarter-phase retardation film 102b is a liquid crystal film having a positive dispersion characteristic, the half-phase retardation film 102C is a liquid crystal film having a positive dispersion characteristic, and the positive C-plate viewing angle compensation film 102a is a liquid crystal film having a vertical in-plane phase difference characteristic.

In this embodiment, the composite phase retardation film 102 is a liquid crystal inverse dispersion film, that is, the composite phase retardation film 102 is made of a liquid crystal material, and the liquid crystal material has good birefringence, so that the composite phase retardation film can be formed into a thin functional film 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 module having the thinned functional film, and a liquid crystal display product provided with the thinned functional film, can be obtained, and the requirements of thinning trend of a display device and flexible development of a flexible OLED display can be satisfied. Therefore, the composite phase retardation film 102 provided in the embodiment of the present 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 thin functional film.

It should be noted that, the composite phase retardation film 102 provided in this embodiment is an inverse dispersion type liquid crystal film, that is, a film prepared from a liquid crystal material, and the composite phase retardation film 102 is prepared from other materials, where the thickness of the obtained film layer is thicker, for example, the thickness of the film layer prepared from a polymer material is up to 50 μm, even more than 50 μm, so that it is difficult to meet the requirement of the optical device for thinning the phase retardation film more and more.

The thickness of the composite phase retardation film 102 provided in this embodiment may be as low as 1 μm, and the specific thickness may preferably be 1 μm to 25 μm, and the thickness of the phase retardation film at this thickness is thinner, which is far lower than the thickness of the phase retardation film prepared with the polymer material, so as to satisfy the requirement of thinning the display.

In the embodiment of the present application, the half-phase retardation film 102c and the quarter-phase retardation film 102b are both liquid crystal films having positive dispersion characteristics. The liquid crystal films used for the half-phase retardation film 102c, the quarter-phase retardation film 102b of the embodiment of the present application may be an a-plate phase retardation film, a liquid crystal type O-plate phase retardation film, or a liquid crystal type biaxial phase retardation film. 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.

As a specific example, the half-phase retardation film 102c and the quarter-phase retardation film 102b are both liquid crystal type a-plate phase retardation films; or, the half-phase retardation film 102c and the quarter-phase retardation film 102b are both liquid crystal type O-plate phase retardation films; alternatively, the half-phase retardation film 102c and the quarter-phase retardation film 102b are both liquid crystal type biaxial phase retardation films; or, the half-phase retardation film 102c and the quarter-phase retardation film 102b are respectively a liquid crystal type a-plate phase retardation film and a liquid crystal type O-plate phase retardation film; or, the half-phase retardation film 102c and the quarter-phase retardation film 102b are respectively a liquid crystal type O-plate phase retardation film and a liquid crystal type a-plate phase retardation film; or, the half-phase retardation film 102c and the quarter-phase retardation film 102b are respectively a liquid crystal type a-plate phase retardation film and a liquid crystal type biaxial phase retardation film; or, the half-phase retardation film 102c and the quarter-phase retardation film 102b are respectively a liquid crystal type biaxial retardation film and a liquid crystal type a-plate phase retardation film; or, the half-phase retardation film 102c and the quarter-phase retardation film 102b are respectively a liquid crystal type O-plate phase retardation film and a liquid crystal type biaxial phase retardation film; alternatively, the half-phase retardation film 102c and the quarter-phase retardation film 102b are respectively a liquid crystal type biaxial retardation film and a liquid crystal type O-plate retardation film.

In one embodiment, the materials of the quarter-phase retardation film 102b and the half-phase retardation film 102c are each independently selected from any one of the following:

-a rod-like liquid crystal;

-discotic liquid crystals;

-rod-shaped liquid crystals doped with palm molecules;

in one embodiment, the material of the positive C-plate viewing angle compensation film 102a is selected from any one of the following alone:

-a rod-like liquid crystal;

-discotic liquid crystals.

The composite type reverse dispersion film prepared by the above material can not only provide a suitable optical axis angle to the composite type reverse dispersion film, thereby forming a suitable angle with the absorption axis of the linear polarizing plate 101, but also provide the reverse wavelength dispersion characteristic of the composite type reverse dispersion film.

Further 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 based on the total weight of the chiral molecule doped rod-shaped liquid crystal. If the doping amount of the chiral molecules is too high, the composite type reverse dispersion film is affected to have a proper optical axis angle, and the optical axis of the composite type reverse dispersion film and the absorption axis of the linear polarizing plate 101 form an angle range exceeding or falling short, and thus the composite type reverse dispersion film having reverse wavelength dispersion characteristics cannot be obtained.

In one embodiment, the materials of the half-phase retardation film 102c and the quarter-phase retardation film 102b are selected from rod-shaped liquid crystals LC242, LC1057 manufactured by BASF corporation, or from rod-shaped liquid crystals RMS-03001, RMS-03011 manufactured by MERCK corporation. In another embodiment, the materials of the half-phase retardation film 102c and the quarter-phase retardation film 102b are selected from the rod-shaped liquid crystal LC242 or LC1057 manufactured by BASF company and the palm-shaped liquid crystal LC756 manufactured by BASF company, or the rod-shaped liquid crystal RMS-03001 manufactured by MERCK company and the palm-shaped liquid crystal LC756 manufactured by BASF company. The material of the positive C-plate viewing angle compensation film 102a is selected from a rod-shaped liquid crystal ROF7201 manufactured by Rolic corporation, or a rod-shaped liquid crystal RMM-2190 manufactured by MERCK corporation.

It is yet another object of an embodiment of the present application to provide an optical application comprising an optical plate 100 having a retardation layer structure as described above.

For example, the optical application member may be an optical component including the cholesteric liquid crystal brightness enhancement film and the optical plate member 100 having the phase difference layer structure described above.

The optical assembly comprising the cholesteric liquid crystal brightness enhancement film and the optical plate 100 with the phase difference layer structure can be applied to a liquid crystal display to improve the overall brightness enhancement efficiency and reduce the wide-angle chromatic aberration. Likewise, the optical component provided in the embodiments of the present application may replace the existing corresponding optical component for use in known structures and devices.

For another example, the optical application may be an optical device including a light emitting diode, a field emission display, a plasma display, a liquid crystal display, a 3D display, 3D glasses. The optical plate 100 with the phase difference layer structure provided in the embodiment of the present application can be applied to a light emitting diode display, so as to improve the problem of natural light reflection. Among them, light emitting diodes include Organic Light Emitting Diodes (OLED) and quantum dot light emitting diodes (QLED).

The embodiment of the present application also provides a method for preparing the quarter-phase retardation film 102b and the half-phase retardation film 102c, which includes:

s01, providing an optical plastic base film and a liquid crystal material, and carrying out alignment treatment on the optical plastic base film. The material of the optical grade plastic base film is not particularly limited, and includes, but is not limited to, cellulose triacetate (Triacetate Cellulose, TAC), polymethyl methacrylate (PMMA), polycarbonate (PC), cyclic olefin polymer (Cyclo Olefin Polymer, COP), acryl (Acryl), polyvinylidene fluoride (Polyvinylidene difluoride, PVDF), polyethylene terephthalate (PET), and polyethylene terephthalate-1, 4-cyclohexanedimethanol ester (PETG).

The liquid crystal material is as before, and is not described here again for the sake of economy.

The optical grade plastic base film is subjected to alignment treatment including but not limited to rubbing alignment method and photo alignment method. Since the optical alignment process can arbitrarily adjust the optical axis direction of the liquid crystal molecules, a roll-to-roll process can be used to obtain the half-retardation film 102c and the quarter-retardation film 102b having the desired optical axis direction (e.g., the polymer material is different from the retardation film prepared in this way), thereby having better productivity. It should be noted that, when the materials of the half-retardation film 102c and the quarter-retardation film 102b are selected from rod-shaped liquid crystals doped with palm molecules, the liquid crystal molecules of the half-retardation film 102c and the quarter-retardation film 102b can be aligned along the optical axis direction by matching with a rubbing alignment method, and the required optical axis angle can be achieved through self-assembly adjustment, so as to obtain the composite type reverse dispersion film with reverse wavelength dispersion characteristics, and the composite type retardation film 102 provided in the embodiments of the present application.

S02, depositing a liquid crystal material on the optical grade plastic base film subjected to alignment treatment, and drying and photo-curing to obtain the optical grade plastic base film.

The embodiment of the application also provides a preparation method of the positive C-plate visual angle compensation film 102a, which comprises the following steps:

s01, providing an optical grade plastic base film and a liquid crystal material, and performing active treatment on the optical grade plastic base film. The optical grade plastic base film was subjected to an active treatment comprising a ROM-201 active layer coating using ROLIC mill.

S02, depositing a liquid crystal material on the optical grade plastic base film after the active treatment, and drying and photo-curing to obtain the optical grade plastic base film.

The combination of the quarter-phase retardation film 102b, the half-phase retardation film 102C and the positive C-plate viewing angle compensation film 102a is optimized by optical simulation modeling. The simulation generation method in which the quarter-phase retardation film 102b, the half-phase retardation film 102C, and the positive C-plate viewing angle compensation film 102a are laminated together will be described below.

Specifically, the method for generating the simulation of the optical sheet 100 having the retardation layer structure includes:

based on the polarization optical principle, the mueller matrix of the quarter-phase retardation film 102b, the mueller matrix of the half-phase retardation film 102C, and the mueller matrix of the positive C-plate viewing angle compensation film 102a are calculated and acquired; based on the mueller matrix of the quarter-phase retardation film 102b, the mueller matrix of the half-phase retardation film 102C, and the mueller matrix of the positive C-plate viewing angle compensation film 102a, and synthesizing the mueller matrix of the composite phase retardation film 102 using a polar decomposition method; extracting phase difference information and angle information of the composite phase delay film 102 according to the mueller matrix of the composite phase delay film 102;

Setting a set error value between the outgoing light of the linear polarized light which accords with the expected angle and the circular polarized light which accords with the expected angle after the linear polarized light passes through the composite phase delay film 102, and representing the difference between the composite phase delay film and an ideal phase delay film according to the error value; formulating an evaluation function according to requirements, calculating error values of all phase differences and angles, bringing the obtained error values into the evaluation function, and calculating the evaluation function to obtain an optimal solution combination meeting expectations according to convergence conditions of the evaluation function;

under the condition of normal incidence plane of the front view angle and at a specific wavelength, phase difference information of the quarter-phase retardation film 102b, phase difference information of the half-phase retardation film 102c and included angle information between the two are obtained, a wavelength dispersion curve of the composite phase retardation film 102 is obtained through calculation according to the phase difference information, the included angle information and delta n of materials, corresponding errors are obtained from the wavelength dispersion curve, and an evaluation function is calculated according to the errors so as to screen out a section near an extreme value of the function as a most preferable simulation reference value.

The judgment of the quality of the simulation calculation result is evaluated according to the selected evaluation function, and the evaluation function is determined by actual specific requirements. According to the simulation scheme provided by the embodiment of the application, the selected evaluation function is the root mean square value of the error in the set wavelength range, and in the simulation process by using the simulation method, the global optimal solution combination is obtained after all effective values are calculated by using an exhaustion method, and the global optimal solution can be obtained from the global optimal solution combination. Among these, the use of an exhaustive approach is preferred to be more efficient than other optimization algorithms.

Compared with the prior art, the simulation generation method of the optical plate 100 with the phase difference layer structure provided in the embodiment of the application finally simulates and obtains the lamination position information of the linear polarizing plate 101, the quarter-phase retardation film 102b and the half-phase retardation film 102c, the range of the in-plane phase difference value Ro of the quarter-phase retardation film 102b is 100nm to 150nm, the range of the acute angle included angle between the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizing plate 101 is 67.5 degrees to 82.5 degrees, the range of the in-plane phase difference value Ro of the half-phase retardation film 102c is 210nm to 290nm, the range of the acute angle included angle between the optical axis of the half-phase retardation film 102c and the absorption axis of the linear polarizing plate 101 is 7.5 degrees to 22.5 degrees, and the like, and the composite phase retardation film 102 has the inverse wavelength dispersion characteristic.

In other words, by simulating the above layer structure setting position information and parameter range setting, the composite retarder 102 has the characteristic that the longer the wavelength is, the larger the phase difference value is, so that the composite retarder 102 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 liquid crystal display device is eliminated in the full-light domain.

In one embodiment, the simulation generating method further includes:

selecting different Rth values and different position information aiming at the positive C-plate visual angle compensation film 102a, calculating the different Rth values and the different position information based on the most preferable simulation reference values to obtain and count evaluation function values of each azimuth angle and incidence angle under the different Rth values and the different position information, and finally screening out the optimal Rth values and the optimal position information;

wherein the different location information includes any one of three different location information:

the positive C-plate viewing angle compensation film 102a is laminated between the linear polarizing plate 101 and the half-phase retardation film 102C;

or, the positive C-plate viewing angle compensation film 102a is laminated between the quarter-phase retardation film 102b and the half-phase retardation film 102C;

or, the positive C-plate viewing angle compensation film 102a is laminated on a side of the quarter-phase retardation film 102b facing away from the half-phase retardation film 102C.

In the parameter simulation of the positive C-plate viewing angle compensation film 102a of this embodiment, the optimal combination of the layer structures selected in the above steps is used to calculate different Rth values and different positions of the positive C-plate viewing angle compensation film 102 a.

In one embodiment, the anchoring the specific wavelength sets a set angle difference between the integrated value of the optical axis angle and the circular phase retardation of the composite phase retardation film 102 and the vibration direction of the incident linear polarized light, and defines a set error value between the actual angle difference and the set angle difference at any wavelength, derives the actual angle difference according to the set angle difference and the set error value, simulates the actual angle difference to generate a stereoscopic image, and makes the actual angle difference approach to the set angle difference in the simulation process, including:

setting the set angle difference between the combined value of the angle and the circular phase retardation of the composite phase retardation film 102 and the vibration direction of the incident linear polarized light to be 45 degrees under the anchoring wavelength of 550nm, and setting the stokes vector of the incident linear polarized light of which the emergent light is right-handed circularly polarized light to be Sin;

and, the normalized stokes vector of the transmitted light after Sin is incident on the composite phase retardation film 102 at any wavelength is set as Sout, the set error value is defined as the inverse cosine of the fourth parameter of Sout, and the actual angle difference required by simulation is deduced according to the set angle difference and the inverse cosine of the fourth parameter of Sout.

The error is defined as the inverse cosine of the fourth parameter of Sout, i.e. the formula y=arccosx, and is also equivalent to the angle Sout forms with the positive direction of the S3 axis in poincare sphere. Wherein, the four parameters of the Stokes vector all have units of light intensity, understand the physical meaning of each parameter: s0 is proportional to the total intensity of the incident light; s1 characterizes whether the light is polarized closer to the x-direction (S1 > 0) or the y-direction (S2 < 0), s0=s1 representing that the incident light is x-axis direction vibrating linearly polarized light; s2 characterizes whether the light is polarized closer to +45° (S2 > 0) or-45 ° (S2 < 0) direction; s3 characterizes whether the light is closer to right circularly polarized light (S3 > 0) or left circularly polarized light (S3 < 0), sout is the fourth parameter, S3.

The definition of the error set above is throughout the simulation method provided in this embodiment, and the direct meaning of the error is the difference between Sout and the circularly polarized light according to the expectation, and the difference can directly represent the intensity of the circular deviation capability of the phase delay film line due to the fact that the selected incident light is the linearly polarized light according to the expectation. The smaller the error value is, the stronger the circular deflection capability of the phase delay film line is, and on the contrary, the larger the error value is, the weaker the circular deflection capability of the phase delay film line is. Wherein, linear polarization refers to linear polarized light, and circular polarization refers to circular polarized light.

In one embodiment, under the condition of the normal incidence plane of the front view angle and at a specific wavelength, the phase difference information of the quarter-phase retardation film 102b, the phase difference information of the half-phase retardation film 102c and the angle information between the two are obtained, the wavelength dispersion curve of the composite phase retardation film 102 is obtained by calculating according to the phase difference information, the angle information and the Δn of the material, and the corresponding error is obtained from the wavelength dispersion curve, and the extremum section of the function is selected as the most preferable simulation reference value according to the error calculation evaluation function, which comprises:

It should be noted that, in the process of screening out the extremum segment of the function as the most preferable analog reference value, the upper limit value and the lower limit value of the wavelength selection range may be variably selected according to specific requirements, and the upper limit value and the lower limit value of the wavelength selection range are adjusted based on the analog path in the embodiment of the present application, which is also within the limitation range in the embodiment of the present application.

In this embodiment, the above range is preferable, and the result is not significantly changed, and the 380nm-780nm is visible light range, and after the range is reduced to 400nm-700nm, each index is not significantly changed. In addition, the calculated range of the phase difference obtained after the simulation is 0-180 degrees, the interval can be changed to 0.1-5 degrees, and the range of the calculated optimal phase difference value is 120-160 nm.

In one embodiment, the selecting different Rth values and different position information for the positive C-plate viewing angle compensation film 102a, calculating the different Rth values and the different position information based on the most preferable simulation reference values, obtaining a polar error graph of all-band full azimuth angles under the different Rth values and the different position information, counting average values of angle error values and full azimuth angles errors under different setting ranges, and finally screening out the optimal Rth values and the optimal position information, including:

and counting the distribution condition of the evaluation function value at different azimuth angles, obtaining the discrete degree, the maximum value and the minimum value of the evaluation function value at different azimuth angles under different Rth values, and the trend of the evaluation function value changing along with the Rth values, and finally screening out the optimal Rth value and the optimal position information.

And finally screening out the optimal Rth value and the optimal position information by counting the average value of errors of angles less than or equal to 15 degrees, angles less than or equal to 20 degrees, angles less than or equal to 25 degrees and all azimuth angles.

The error angle is smaller than 15 °, 20 °, 25 ° and is used for observing the discrete degree and the distribution condition of the evaluation function value in the embodiment, the specific evaluation method and the numerical value adopted are selected according to specific requirements, and the embodiment does not specifically limit the numerical value. The average value of the all-azimuth error is used for the rough trend of the statistical evaluation function value changing along with Rth, and the specific evaluation method also changes along with the change of the evaluation function, which is not particularly limited in this embodiment.

In the simulation method provided in the embodiment of the present application, according to the simulation procedure described above, the calculation according to the present embodiment is divided into two parts, wherein one part is the correlation value of Rth calculated when the angle of incidence is oblique under the condition of selecting the normal viewing angle, and the other part is the correlation value of Rth calculated when the angle of incidence is oblique, wherein the obtaining of the correlation value of Rth is performed and calculated based on the correlation result obtained under the condition of the normal viewing angle,

In summary, according to the simulation method provided by the embodiment of the application, sin and a corresponding full-band phase difference, namely wavelength dispersion, are calculated according to a phase difference under a specific wavelength, errors are calculated based on the calculated differences, an evaluation function is calculated according to the errors, an optimal solution under a positive viewing angle is obtained through evaluation of the evaluation function, the errors and evaluation function values under each incident angle and azimuth angle are calculated by combining Rth related parameters on the basis of the optimal solution, the evaluation function values are calculated based on the errors, and finally the evaluation function values are counted and the optimal Rth parameters are evaluated, so that the optimal parameters of the optical plate of the phase difference layer structure provided by the embodiment of the application are obtained.

For convenience of explanation, the above-described simulation generation method and optical performance of the generated composite type retarder film 102 and the finally formed optical sheet 100 will be described in detail by respectively listing examples and comparative examples, and referring to the graph or the broken line analysis chart in fig. 2 to 10.

Example 1

Embodiment 1 specifically provides a composite type retardation film 102 in the embodiment of the present application, the composite type retardation film 102 being a liquid crystal type inverse dispersion composite type quarter-phase retardation film comprising a half-phase retardation film 102c and a quarter-phase retardation film 102b laminated and bonded, the in-plane phase difference Ro of the quarter-phase retardation film 102b being 100nm to 150nm, the acute angle formed by the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizing plate 101 being 67.5 ° to 82.5 °, the in-plane phase difference Ro of the half-phase retardation film 102c being 210nm to 290nm, the acute angle formed by the optical axis of the half-phase retardation film 102c and the absorption axis of the linear polarizing plate 101 being 7.5 ° to 22.5 °.

Example 2

Embodiment 2 specifically provides an optical plate 100 having a retardation layer structure in the embodiment of the present application, which includes a linearly polarizing plate 101 and a composite type phase retardation film 102 that are stacked, the composite type phase retardation film 102 being a liquid crystal type inverse-dispersion composite type quarter-phase retardation film. Wherein the composite phase retardation film 102 includes a half phase retardation film 102c and a quarter phase retardation film 102b laminated and combined, and the linear polarizing plate 101 is laminated on a side of the half phase retardation film 102c away from the quarter phase retardation film 102 b. The in-plane phase difference Ro of the quarter-phase retardation film 102b is 100nm to 150nm, the acute angle formed by the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizing plate 101 is 67.5 ° to 82.5 °, the in-plane phase difference Ro of the half-phase retardation film 102c is 210nm to 290nm, and the acute angle formed by the optical axis of the half-phase retardation film 102c and the absorption axis of the linear polarizing plate 101 is 7.5 ° to 22.5 °.

Example 3

Embodiment 3 specifically provides an optical plate 100 with a retardation layer structure in the embodiment of the present application, which includes a composite type retardation film 102 of a linearly polarizing plate 101 stacked and disposed, the composite type retardation film 102 being a liquid crystal type inverse dispersion composite type quarter-phase retardation film, the composite type retardation film 102 including a half-phase retardation film 102C, a positive C-plate viewing angle compensation film 102a, and a quarter-phase retardation film 102b stacked and combined, the linearly polarizing plate 101 being stacked and disposed on a side of the half-phase retardation film 102C away from the quarter-phase retardation film 102 b; the positive C-plate viewing angle compensation film 102a is disposed between the half-phase retardation film 102C and the quarter-phase retardation film 102 b. The in-plane phase difference Ro of the quarter-phase retardation film 102b is 100nm to 150nm, and the acute angle formed by the optical axis of the quarter-phase retardation film 102b and the absorption axis of the linear polarizing plate 101 is 67.5 ° to 82.5 °; the in-plane phase difference value Ro of the half-phase retardation film 102c is 210nm to 290nm; and the acute angle formed by the optical axis of the half-phase retardation film 102c and the absorption axis of the linear polarizing plate 101 is 7.5 ° to 22.5 °; the vertical in-plane retardation value Rth of the large viewing angle positive C-phase retardation film is 50nm to 160nm.

Comparative example 1

Comparative example 1 specifically provides a quarter-phase retardation film (hereinafter referred to as a conventional known quarter-phase retardation film) which preferably employs a polymer extended quarter-phase retardation film of the model RM147, which is a single-layer film.

The theoretical calculated value and the actual sample measured value of the liquid crystal type inverse dispersion quarter-phase retardation film 102 provided in example 1, and the wavelength dispersion compared with the known quarter-phase retardation film, and the error of the phase difference calculation of the three were compared, and the wavelength dispersion and the error relationship are shown in fig. 2 and 3. Wherein the horizontal axis is wavelength, the wavelength range is selected to be 400nm to 700nm, and the vertical axis is in-plane phase difference value Ro and error; as can be seen from fig. 2, the in-plane phase difference Ro of the liquid crystal type inverse dispersion quarter-phase retardation film 102 of example 1 has the highest matching degree between the phase difference in the full band and the theoretical value, and is superior to the conventional quarter-phase retardation film, especially in the blue and green light bands. The Ro value of the actual sample simulated and produced according to example 1 is close to the theoretical calculation value, and the structural scheme of example 1 has feasibility and can guide actual production. Comparing the theoretical calculation value with the actual measurement value of example 1, and calculating the error comparison, it can be seen that the actual sample deviates most in the blue light band, and it can be expected that the reflectance of the actual sample in the blue light band is larger than the theoretical calculation value.

In fig. 2, the upper right corner 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 an actual measurement fit value of example 1, and the lowermost chain line is an actual measurement fit value of comparative example 1.

After the known quarter-phase retardation film provided in comparative example 1 was attached to the linear polarizing plate 101, the same as the optical plate 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. 4. 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. 4, the reflectance of example 2 was lower than that of comparative example 1 after the linear polarizing plate 101 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-phase retardation film provided in comparative example 1 and the liquid crystal type composite type reverse dispersion film provided in example 1 both have reverse wavelength dispersion characteristics similar to the trend of ideal wavelength dispersion, and therefore, the known quarter-phase retardation film and the liquid crystal type reverse dispersion composite type reverse dispersion film both can approach the ideal phase difference value in the visible wavelength range, but since the liquid crystal type composite type reverse dispersion film provided in example 1 of the present invention has the ideal phase difference value more similar to the visible wavelength range than the known quarter-phase retardation film provided in comparative example 1, the better anti-reflection effect (smaller average reflectivity R%) can be obtained than the known quarter-phase retardation film provided in comparative example 1. In embodiment 1 of the present application, the ultra-thin type wide-wave-domain circular polarizing plate composed of the liquid crystal type composite inverse dispersion film 102 and the linear polarizing plate 101 has a reflectivity of 4% to 6% in the visible light wavelength region (400 nm to 700 nm), that is, the ultra-thin type wide-wave-domain circular polarizing plate provided by the embodiment of the present invention has a good anti-reflection effect.

The error was calculated after the optical sheet member 100 provided in example 2 of the present application was attached to the positive C-plate viewing angle compensation film 102a, and the ratio of the error to the average error is as shown in fig. 5 to 10. 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 with circles and the current Rth value is marked, wherein one curve has a situation that one extremum corresponds to a plurality of Rth values, namely, a situation that the extremum is parallel to the axis of the Rth values, and the intermediate values of the Rth values are marked. As can be seen from fig. 5 to 10, the situation of the positive C-plate viewing angle compensation film 102a is optimal when the half-phase retardation film 102C and the quarter-phase retardation film 102b are intermediate, compared with other positions, the minimum value of the average error of the positive C-plate viewing angle compensation film 102a when the half-phase retardation film 102C and the quarter-phase retardation film 102b are intermediate is the lowest, the error ratio is the largest, and the ratio of the error of 25 ° or less can reach 100%. As can be seen from fig. 5 and 6, the average error minimum is at Rth value equal to 99nm, while the Rth value is suitably chosen between 70 and 110nm, taking into account the uniformity of the error ratio.

In fig. 5, 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 25 ° or less, the next is a duty curve having an error of 20 ° or less, and the lowermost is a duty curve having an error of 15 ° or less.

In fig. 7, 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 25 ° or less, the next is a duty curve having an error of 20 ° or less, and the lowermost is a duty curve having an error of 15 ° or less.

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 25 ° or less, the next is a duty curve having an error of 20 ° or less, and the lowermost is a duty curve having an error of 15 ° or less.

The known quarter-phase retardation film provided in comparative example 1 was attached to a linear polarizing plate 101, and the optical plate 100 provided in example 3 of the present application was attached to an OLED panel, respectively, to perform a large viewing angle reflectance test, and 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 maps are shown in fig. 11 and 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 was a Solid Spec-3700 spectrometer (manufactured by Shimadzu corporation, model: solid Spec-3700) with a wavelength range of 380nm to 780nm. As can be seen from fig. 11 and 12, after the positive C-plate viewing angle compensation film 102a is added, the large viewing angle reflectance of example 3 is significantly smaller than the large viewing angle reflectance of the laminated linear polarizing plate 101 of example 2 and comparative example 1, and the positive C-plate viewing angle compensation film 102a has a significant effect of reducing the reflectance at a large viewing angle.

In fig. 9, the respective folding lines are 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 2 is the outermost one, and next, the measured value of the linear polarizing plate 101101 is bonded to the comparative example 1, and the measured value of example 3 is the innermost one.

In fig. 10, the respective folding lines are 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 2 is the outermost one, and next, the measured value of comparative example 1 is the measured value of the laminated linear polarizing plate 101101, and the measured value of example 3 is the innermost one.

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

Claims

1. An optical plate (100) having a retardation layer structure, characterized in that:

the optical plate (100) is a circularly polarized plate;

the optical plate (100) comprises a linear polarizing plate (101) and a composite phase retardation film (102) which are stacked, wherein the composite phase retardation film (102) is an inverse dispersion film;

the composite phase retardation film (102) at least comprises a quarter-phase retardation film (102 b) and a half-phase retardation film (102 c) which are laminated, wherein the linear polarizing plate (101) is laminated on one side of the half-phase retardation film (102 c) away from the quarter-phase retardation film (102 b), and the quarter-phase retardation film (102 b) and the half-phase retardation film (102 c) are positive dispersion films;

And, the in-plane phase difference value Ro of the quarter-phase retardation film (102 b) ranges from 100nm to 150nm, and the acute angle included angle between the optical axis of the quarter-phase retardation film (102 b) and the absorption axis of the linear polarizing plate (101) ranges from 67.5 ° to 82.5 °;

the in-plane phase difference value Ro of the half-phase retardation film (102 c) ranges from 210nm to 290nm, and the acute angle included between the optical axis of the half-phase retardation film (102 c) and the absorption axis of the linear polarizing plate (101) ranges from 7.5 DEG to 22.5 deg.

2. An optical plate (100) having a retardation layer structure as claimed in claim 1, wherein:

the composite phase retardation film (102) further comprises a positive C-plate viewing angle compensation film (102 a);

the positive C-plate viewing angle compensation film (102 a) is laminated between the linear polarizing plate (101) and the half-phase retardation film (102C);

or, the positive C-plate viewing angle compensation film (102 a) is laminated between the quarter-phase retardation film (102 b) and the half-phase retardation film (102C);

or, the positive C-plate viewing angle compensation film (102 a) is laminated on one side of the quarter-phase retardation film (102 b) away from the half-phase retardation film (102C).

3. An optical plate (100) having a retardation layer structure as claimed in claim 1, wherein:

the positive C-plate viewing angle compensation film (102 a) is laminated between the quarter-phase retardation film (102 b) and the half-phase retardation film (102C);

and, the range of the in-plane retardation value Rth of the positive C-plate viewing angle compensation film (102 a) is 50nm to 160nm.

4. An optical plate (100) having a retardation layer structure as claimed in claim 3, wherein:

the positive C-plate viewing angle compensation film (102 a) has a vertical in-plane retardation value Rth in the range of 60nm to 110nm.

5. An optical plate (100) having a retardation layer structure as claimed in claim 3, wherein:

the composite phase retardation film (102) further includes a first adhesive layer and a second adhesive layer;

the first adhesive layer is laminated between the half-phase retardation film (102C) and the positive C-plate viewing angle compensation film (102 a), and the second adhesive layer is laminated between the quarter-phase retardation film (102 b) and the positive C-plate viewing angle compensation film (102 a).

6. An optical plate (100) having a retardation layer structure as claimed in claim 5, wherein:

The total thickness of the composite phase retardation film (102) is 1 μm to 25 μm.

7. An optical plate (100) having a retardation layer structure according to any one of claims 2-6, wherein:

the composite phase delay film (102) is a liquid crystal inverse dispersion film; wherein,

the quarter-phase retardation film (102 b) is a liquid crystal film having a positive dispersion characteristic;

the half-phase retardation film (102 c) is a liquid crystal film having a positive dispersion characteristic;

the positive C-plate viewing angle compensation film (102 a) is a liquid crystal film having a vertical in-plane retardation characteristic.

8. An optical plate (100) having a retardation layer structure according to any one of claims 1-6, wherein:

the half-phase retardation film (102 c) and the quarter-phase retardation film (102 b) are both liquid crystal type a-plate phase retardation films;

or, the half-phase retardation film (102 c) and the quarter-phase retardation film (102 b) are both liquid crystal type O-plate phase retardation films;

or, the half-phase retardation film (102 c) and the quarter-phase retardation film (102 b) are both liquid crystal type biaxial phase retardation films;

or, the half-phase retardation film (102 c) and the quarter-phase retardation film (102 b) are respectively a liquid crystal type A-plate phase retardation film and a liquid crystal type O-plate phase retardation film;

Or, the half-phase retardation film (102 c) and the quarter-phase retardation film (102 b) are respectively a liquid crystal type O-plate phase retardation film and a liquid crystal type A-plate phase retardation film;

or, the half-phase retardation film (102 c) and the quarter-phase retardation film (102 b) are respectively a liquid crystal type A-plate phase retardation film and a liquid crystal type biaxial phase retardation film;

or, the half-phase retardation film (102 c) and the quarter-phase retardation film (102 b) are respectively a liquid crystal type biaxial retardation film and a liquid crystal type A-plate phase retardation film;

or, the half-phase retardation film (102 c) and the quarter-phase retardation film (102 b) are respectively a liquid crystal type O-plate phase retardation film and a liquid crystal type biaxial phase retardation film;

or, the half-phase retardation film (102 c) and the quarter-phase retardation film (102 b) are respectively a liquid crystal type biaxial retardation film and a liquid crystal type O-plate phase retardation film.

9. An optical plate (100) having a retardation layer structure according to any one of claims 1-6, wherein:

the materials of the quarter-phase retardation film (102 b) and the half-phase retardation film (102 c) are respectively selected from any one of the following:

-a rod-like liquid crystal;

-discotic liquid crystals;

rod-shaped liquid crystals doped with palm-like molecules.

10. An optical plate (100) having a retardation layer structure according to any one of claims 2-6, wherein:

the positive C-plate visual angle compensation film (102 a) is a liquid crystal positive C-plate phase difference retardation film;

the material of the positive C-plate viewing angle compensation film (102 a) is selected from any one of the following alone:

-a rod-like liquid crystal;

-discotic liquid crystals.

11. An optical application, characterized in that:

the optical application comprises an optical plate (100) with a retardation layer structure according to any of claims 1-10.

12. A simulation generation method of an optical plate (100) having a retardation layer structure according to any one of claims 2 to 10, wherein:

the simulation generation method comprises the following steps:

based on the polarization optical principle, calculating and obtaining the Mueller matrix of the quarter-phase retardation film (102 b), the Mueller matrix of the half-phase retardation film (102C) and the Mueller matrix of the positive C-plate visual angle compensation film (102 a); synthesizing the mueller matrix of the composite phase retardation film (102) by a polar decomposition method based on the mueller matrix of the quarter-phase retardation film (102 b), the mueller matrix of the half-phase retardation film (102C), and the mueller matrix of the positive C-plate viewing angle compensation film (102 a); extracting phase difference information and angle information of the composite phase delay film (102) according to a mueller matrix polar decomposition method of the composite phase delay film (102);

under the condition of normal incidence plane of a front view angle and under a specific wavelength, phase difference information of the quarter-phase retardation film (102 b), phase difference information of the half-phase retardation film (102 c) and included angle information between the quarter-phase retardation film and the quarter-phase retardation film are obtained, a wavelength dispersion curve of the composite phase retardation film (102) is obtained through calculation according to the phase difference information, the included angle information and delta n of materials, corresponding errors are obtained from the wavelength dispersion curve, and an evaluation function is calculated according to the errors so as to screen out a section near a function extreme value as a most optimal simulation reference value.

13. The simulation generation method of an optical plate (100) having a phase difference layer structure according to claim 12, wherein:

The simulation generation method further comprises the following steps:

selecting different Rth values and different position information aiming at a positive C-plate visual angle compensation film (102 a), calculating the different Rth values and the different position information based on the most preferable simulation reference values to obtain and count evaluation function values of each azimuth angle and each incidence angle under the different Rth values and the different position information, and finally screening out the optimal Rth values and the optimal position information;

14. The simulation generation method of an optical plate (100) having a phase difference layer structure according to claim 12, wherein:

Formulating an evaluation function according to requirements, calculating error values of all phase differences and angles, bringing the obtained error values into the evaluation function, and calculating the evaluation function to obtain an optimal solution combination meeting expectations according to convergence conditions of the evaluation function, wherein the method comprises the following steps:

setting the set angle difference between the integrated value of the optical axis angle and the circular phase delay of the composite phase delay film (102) and the vibration direction of the incident linear polarized light to be 45 degrees under the anchoring wavelength of 550nm, and setting the Stokes vector of the incident linear polarized light of which the emergent light is the right-handed polarized light to be Sin;

and, the normalized Stokes vector of the transmitted light after Sin is incident on the composite phase retardation film (102) at any wavelength is set as Sout, the set error value is defined as the inverse cosine of the Sout fourth parameter, and the actual angle difference required by simulation is deduced according to the set angle difference and the inverse cosine of the Sout fourth parameter.

15. The simulation generation method of an optical plate (100) having a phase difference layer structure according to claim 13, wherein:

under the condition of normal incidence plane of the front view angle and under specific wavelength, phase difference information of the quarter-phase retardation film (102 b), phase difference information of the half-phase retardation film (102 c) and included angle information between the quarter-phase retardation film and the quarter-phase retardation film are obtained, a wavelength dispersion curve of the composite phase retardation film (102) is obtained through calculation according to the phase difference information, the included angle information and delta n of materials, corresponding errors are obtained from the wavelength dispersion curve, and a function extremum section is screened out according to an error calculation evaluation function to serve as a most preferable simulation reference value, and the method comprises the following steps:

16. The simulation generation method of an optical plate (100) having a phase difference layer structure according to claim 13, wherein:

the method comprises the steps of selecting different Rth values and different position information for a positive C-plate visual angle compensation film (102 a), calculating the different Rth values and the different position information based on the most preferable simulation reference values to obtain an error polar coordinate graph of all-wave band all-azimuth angles under the different Rth values and the different position information, counting average values of angle error values and all-azimuth angles errors under different setting ranges, and finally screening out optimal Rth values and optimal position information, wherein the method comprises the following steps:

and counting the distribution condition of the evaluation function value at different azimuth angles, obtaining the dispersion degree, maximum value and minimum value statistical data of the evaluation function value at different azimuth angles under different Rth values, and finally screening out the optimal Rth value and the optimal position information according to the trend of the change of the evaluation function value along with the Rth value.