Polarizing assembly, preparation method thereof and display device

Abstract

The invention discloses a polarization assembly, a preparation method thereof and a display device, and relates to the technical field of display. The polarization assembly comprises a first polarization layer, a second polarization layer and a phase delay film. And the first polarizing layer is used for transmitting a polarization direction as a light-transmitting axis direction. Due to the fact that the number of the second light rays with the polarization degree being zero after passing through the phase delay film is large, or the polarization degree of the first light rays with any wavelength after passing through the phase delay film is small, the brightness difference and color cast are small when a user watches at different viewing angles, and the display effect of near natural light can be achieved conveniently.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a polarization component, a preparation method thereof, and a display device. Background Art

[0002] With the development of display technologies, users have increasingly higher requirements for the functions of display devices. For example, customers in the conference room field usually require that the display device has the functions of low blue light and preventing eye fatigue, while customers of outdoor display products usually require that the display device has the function of near-natural light display.

[0003] In related technologies, in order to enable the display device to have the functions of preventing eye fatigue and near-natural light display, a circularly polarized light display solution is usually adopted.

[0004] However, the existing circularly polarized light display solution is not only complex in structure, but also can only convert light of a certain specific wavelength into circularly polarized light, and the effect of converting circularly polarized light is poor, thereby resulting in large brightness differences and color shifts when viewed by users from different viewing angles. Summary of the Invention

[0005] This application provides a polarization component, a preparation method thereof, and a display device, and the technical solutions are as follows:

[0006] On the one hand, a polarization component is provided, and the polarization component includes:

[0007] A first polarization layer having a transmission axis, and the first polarization layer is used to transmit linearly polarized light with a polarization direction along the direction of the transmission axis;

[0008] A second polarization layer located on one side of the first polarization layer;

[0009] And a phase retardation film located on the side of the second polarization layer away from the first polarization layer, and the phase retardation film is used to make the first light wave fluctuate with a fixed polarization degree as the vibration central axis in a fixed period, where the first light is light with a wavelength in the range of 380 nm to 780 nm after passing through the phase retardation film, and the fixed period is greater than or equal to 20; wherein, the first light includes a second light with a polarization degree of zero, and the absolute value of the difference between adjacent two wavelengths of the second light is positively correlated with the wavelength value of the second light; or, the polarization degree of any wavelength of the first light is less than 0.5.

[0010] Optionally, the phase retardation film is further used to make the peak value of the polarization degree fluctuation of the first light positively correlated with the wavelength of the first light, and / or make the fluctuation frequency of the first light negatively correlated with the wavelength of the first light.

[0011] Optionally, the direction of the transmission axis of the second polarizing layer and the direction of the transmission axis of the first polarizing layer have a first included angle, the range of the first included angle is from 12.5 degrees to 32.5 degrees, and the direction of the optical axis of the phase retardation film is parallel to the direction of the transmission axis of the first polarizing layer; or,

[0012] the direction of the transmission axis of the second polarizing layer is parallel to the direction of the transmission axis of the first polarizing layer, and the direction of the optical axis of the phase retardation film and the direction of the transmission axis of the first polarizing layer have a second included angle, the range of the second included angle is from 35 degrees to 55 degrees.

[0013] Optionally, the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray is positively correlated with the absolute value of the difference between the first included angle and 22.5 degrees, and the first included angle is the included angle between the direction of the transmission axis of the second polarizing layer and the direction of the transmission axis of the first polarizing layer; or,

[0014] the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray is positively correlated with the absolute value of the difference between the second included angle and 45 degrees, and the second included angle is the included angle between the direction of the optical axis of the phase retardation film and the direction of the transmission axis of the first polarizing layer.

[0015] Optionally, the direction of the transmission axis of the second polarizing layer and the direction of the transmission axis of the first polarizing layer have a first included angle, and the first included angle is 22.5 degrees; or,

[0016] the direction of the optical axis of the phase retardation film and the direction of the transmission axis of the first polarizing layer have a second included angle, and the second included angle is 45 degrees.

[0017] Optionally, the phase retardation film has refractive indices in two directions, and the difference between the refractive indices in the two directions is greater than 0.1.

[0018] Optionally, the two directions are perpendicular to each other, or the included angle between the two directions is 45 degrees.

[0019] Optionally, the direction of the optical axis of the phase retardation film is any one of the two directions.

[0020] Optionally, the second polarizing layer has refractive indices in two directions, and the difference between the refractive indices in the two directions is greater than 0.05.

[0021] Optionally, the thickness range of the phase retardation film is from 45 microns to 125 microns.

[0022] Optionally, the phase retardation amount of the first light ray and the third light ray is greater than 8 microns, and the third light ray is the light ray after passing through the second polarizing layer.

[0023] Optionally, the phase retardation film is further configured to make the full-view chromatic aberration of the second light ray less than 5 JND.

[0024] Optionally, the first light ray includes a fourth light ray with a white color, and the degree of polarization of the fourth light ray is less than 5%.

[0025] On the other hand, a method for preparing a polarizing component is provided, and the method includes:

[0026] Forming a coil of a phase retardation film using an optical resin film;

[0027] Sequentially arranging and compounding and bonding a coil of a first polarizing layer, a coil of a second polarizing layer, and a coil of a phase retardation film to obtain a composite coil;

[0028] Cutting the composite coil to obtain a polarizing component, and one of the length direction and the width direction of the obtained polarizing component is parallel to the width direction of the composite coil;

[0029] Wherein, the first polarizing layer in the polarizing component has a transmission axis, the first polarizing layer is used for transmitting linearly polarized light with a polarization direction along the transmission axis direction, the second polarizing layer in the polarizing component is located on one side of the first polarizing layer, the phase retardation film in the polarizing component is located on the side of the second polarizing layer away from the first polarizing layer, the phase retardation film is used for making the first light ray fluctuate in a fixed period with a fixed degree of polarization as the vibration central axis, the first light ray is a light ray with a wavelength in the range of 380 nm to 780 nm after passing through the phase retardation film, and the fixed period is greater than or equal to 20; wherein, the second light ray includes a second light ray with a polarization degree of zero, and the absolute value of the difference between two adjacent wavelengths in the second light ray is positively correlated with the wavelength value of the second light ray; or, the polarization degree of any wavelength of the first light ray is less than 0.5.

[0030] In yet another aspect, a display device is provided, and the display device includes: a display panel, and a polarizing component as described in the above aspect, and the polarizing component is located on the light-emitting side of the display panel.

[0031] The beneficial effects brought by the technical solution provided in this application at least include:

[0032] This application provides a polarizing component, a preparation method thereof, and a display device. The polarizing component includes a first polarizing layer, a second polarizing layer, and a phase retardation film. The first polarizing layer is used for transmitting linearly polarized light with a polarization direction along the transmission axis direction. Since the number of second light rays with a polarization degree of zero after passing through the phase retardation film is large, or the polarization degree of any wavelength of the first light ray after passing through the phase retardation film is relatively small, the brightness difference and color deviation are small when the user views from different perspectives, which is convenient for realizing a display effect close to natural light. Description of the Drawings

[0033] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0034] Figure 1 is a schematic structural diagram of a polarization component in the related art;

[0035] Figure 2 is a schematic structural diagram of another polarization component in the related art;

[0036] Figure 3 is a schematic diagram of the change in refractive index when natural light passes through a material with birefringence characteristics in the embodiments of the present application;

[0037] Figure 4 is a schematic diagram of the phase difference after natural light passes through a material with birefringence characteristics in the embodiments of the present application;

[0038] Figure 5 is a schematic structural diagram of a polarization component provided by the embodiments of the present application;

[0039] Figure 6 is a schematic structural diagram of a first polarization layer provided by the embodiments of the present application;

[0040] Figure 7 is a schematic diagram of the polarization degree curve of light provided by the embodiments of the present application;

[0041] Figure 8 is a schematic diagram of the optical axis direction of a half-wave polarization film provided by the embodiments of the present application;

[0042] Figure 9 is a schematic structural diagram of a half-wave polarization film provided by the embodiments of the present application;

[0043] Figure 10 is a schematic diagram of the optical axis direction during the stretching process of an optical resin film provided by the embodiments of the present application;

[0044] Figure 11 is a schematic diagram of the forming process flow of a phase retardation film provided by the embodiments of the present application;

[0045] Figure 12 is a schematic diagram of the lamination of a phase retardation film roll, a second polarization layer roll, and a first polarization layer roll provided by the embodiments of the present application;

[0046] Figure 13It is a fitting schematic diagram of another roll of phase delay film, a roll of the second polarizing layer, and a roll of the first polarizing layer provided by an embodiment of the present application;

[0047] Figure 14 It is a schematic diagram of cutting a roll of phase delay film at a 45° angle provided by an embodiment of the present application;

[0048] Figure 15 It is a schematic diagram of a composite structure of a phase delay film, a first polarizing layer, and a second polarizing layer provided by an embodiment of the present application;

[0049] Figure 16 It is a schematic diagram of an outer fitting type of a phase delay film, a first polarizing layer, and a second polarizing layer provided by an embodiment of the present application;

[0050] Figure 17 It is a structural schematic diagram of a polarization degree detection device provided by an embodiment of the present application;

[0051] Figure 18 It is a brightness curve graph under a white screen provided by an embodiment of the present application;

[0052] Figure 19 It is a brightness curve graph under a red screen provided by an embodiment of the present application;

[0053] Figure 20 It is a brightness curve graph under a green screen provided by an embodiment of the present application;

[0054] Figure 21 It is a brightness curve graph under a blue screen provided by an embodiment of the present application;

[0055] Figure 22 It is a curve graph of color coordinate x under a white screen provided by an embodiment of the present application;

[0056] Figure 23 It is a curve graph of color coordinate x under a red screen provided by an embodiment of the present application;

[0057] Figure 24 It is a curve graph of color coordinate x under a green screen provided by an embodiment of the present application;

[0058] Figure 25 It is a curve graph of color coordinate x under a blue screen provided by an embodiment of the present application;

[0059] Figure 26 It is a curve graph of color coordinate y under a white screen provided by an embodiment of the present application;

[0060] Figure 27 It is a curve graph of color coordinate y under a red screen provided by an embodiment of the present application;

[0061] Figure 28 It is a curve graph of the chromaticity coordinate y under a green screen provided by an embodiment of the present application;

[0062] Figure 29 It is a curve graph of the chromaticity coordinate y under a blue screen provided by an embodiment of the present application;

[0063] Figure 30 It is a polarization inspection effect diagram for inspecting the solution of Architecture 1 provided by an embodiment of the present application;

[0064] Figure 31 It is a polarization inspection effect diagram for inspecting the solution of the present application provided by an embodiment of the present application;

[0065] Figure 32 It is a polarization inspection effect diagram with different polarization inspection angles provided by an embodiment of the present application;

[0066] Figure 33 It is a flowchart of a preparation method of a polarization component provided by an embodiment of the present application;

[0067] Figure 34 It is a schematic structural diagram of a display device provided by an embodiment of the present application;

[0068] Figure 35 It is a schematic structural diagram of another display device provided by an embodiment of the present application. Detailed implementation manners

[0069] To make the objectives, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0070] With the popularization and promotion of the fifth-generation mobile communication technology (5G), intelligent Internet of Things has come into the public view and developed rapidly, and it has been rapidly and widely applied in many fields such as smart cities, smart transportation, smart healthcare, smart conferences, smart education, and smart vehicle networking. Customers in the conference and education fields have put forward the demand for green and healthy eye protection displays, requiring products to have the functions of low blue light and preventing eye fatigue; when promoting bus stops, display boards, especially outdoor display products, sign customers have put forward the demands for circularly polarized light display and near-natural light display, and overseas customers in Europe and America have strong demands for this, and this technical requirement has been defined as a necessary technical indicator for entering the overseas market.

[0071] Research on the effects of linearly polarized light and circularly polarized light on the human eye has found that after long-term use of liquid crystal display products, users will experience symptoms such as dry eyes, eye pain, and blurred vision. Moreover, the research has found that when the human eye uses liquid crystal display products with linearly polarized light and circularly polarized light, the blinking frequency of the human eye is significantly different. The blinking frequency of using liquid crystal display products with linearly polarized light is significantly higher than that of using liquid crystal display products with circularly polarized light. This proves that circularly polarized light can effectively reduce eye fatigue and play a role in protecting the eyes compared to linearly polarized light.

[0072] In fact, lutein exists in the spot area of the human eye, arranged in a circular shape, and can absorb light in the blue-violet band. Circularly polarized light can activate more areas of lutein in the human eye compared to linearly polarized light, thereby being able to absorb light in more bands and reduce visual fatigue.

[0073] In the prior art, a technical solution of using a QWP (Quarter wave plate, 1 / 4 wave plate layer) is usually adopted to convert circularly polarized light. Specifically, the 1 / 4 wave plate layer is mainly prepared by using materials with birefringence characteristics such as liquid crystal coatings or birefringent crystals. The 1 / 4 wave plate layer can perform phase delay conversion on linearly polarized light to convert it into circularly polarized light, making the emitted light closer to natural light, achieving the effect of near-natural light display, and thereby reducing eye fatigue. In specific applications, the 1 / 4 wave plate layer can be a liquid crystal coating or a cellulose acetate polymer film.

[0074] Figure 1 is a schematic structural diagram of a polarizing component in the related art. Refer to Figure 1 , the polarizing component 10 may include: a linearly polarized layer 11 and a liquid crystal coating 12. Among them, the liquid crystal coating 12 has the characteristic of birefringence.

[0075] Specifically, after natural light passes through the linearly polarized layer 11, the light with a polarization direction parallel to the linearly polarized layer 11 can pass through, and the light with other polarization directions can be absorbed. Since the liquid crystal coating 12 has the characteristic of birefringence, the linearly polarized light passing through the linearly polarized layer 11 can undergo phase delay after passing through the liquid crystal coating 12 to form circularly polarized light.

[0076] Figure 2 is a schematic structural diagram of another polarizing component in the related art. Refer to Figure 2 , the polarizing component 20 may specifically include: a linearly polarized layer 21 and a cellulose acetate polymer film 22. Among them, the cellulose acetate polymer film 22 has the characteristic of birefringence.

[0077] Specifically, after natural light passes through the linear polarizer layer 21, the light with a polarization direction parallel to that of the linear polarizer layer 21 can pass through, and the light with other polarization directions can be absorbed. Since the cellulose acetate polymer film 22 has the characteristic of birefringence, the linearly polarized light passing through the linear polarizer layer 21 can undergo phase delay after passing through the cellulose acetate polymer film 22, forming circularly polarized light.

[0078] However, since the birefringence of both the liquid crystal coating 12 and the cellulose acetate polymer film 22 is small and the thickness is thin, the amount of phase delay is also correspondingly small. Therefore, only light of a specific wavelength can be depolarized and converted into circularly polarized light, and it is easy to have incomplete polarization and color deviation problems when viewed from different perspectives.

[0079] Referring to Figure 3 , a schematic diagram of the refractive index change when natural light passes through a material with birefringence characteristics is shown. Referring to Figure 4 , a schematic diagram of the phase difference after natural light passes through a material with birefringence characteristics is shown.

[0080] As Figure 3 shown, the birefringence coordinate system represented by the birefringence ellipsoid has the center O of the ellipsoid as the origin, the intersection line of the starting meridian plane and the equatorial plane as the X-axis. The direction orthogonal to the X-axis on the equatorial plane is the Y-axis, and the rotation axis of the ellipsoid is the Z-axis. Thus, the coordinate system O-XYZ is formed. When a beam of light S is incident on the crystal at an angle θ, birefringence occurs. The horizontal ellipse where OB is located is the wavefront of the o light wave. The o light is the ordinary light and propagates in the crystal following the refraction law, that is, it propagates in the OB direction with a refractive index of no. The OZ direction is the wavefront of the e light wave. The e light is the extraordinary light and does not follow the refraction law in the crystal, that is, it propagates in the OA direction with a refractive index of ne(θ).

[0081] Since the phase velocities of the two orthogonal optical fields are different, when light passes through a liquid crystal coating or a cellulose acetate polymer film with a thickness of d, a phase retardation amount δ will be generated. The phase retardation amount δ can be calculated by the following formula:

[0082] δ = 2π * Δn * d / λ Formula (1)

[0083] where λ = 2π = 360°, Δn = ne - no, d is the thickness of the film layer, and the phase difference R0 can be calculated by the following formula:

[0084] R0 = Δn * d Formula (2)

[0085] When the amplitudes of the o light and the e light are the same, the wavelengths represented by the o light and the e light just differ by 1 / 4 of the period λ. Thus, when a beam of linearly polarized light is incident and passes through a birefringent material, the polarization state changes from linear polarization to circular polarization, and the phase difference Δn * d satisfies:

[0086] Δn * d = (2m + 1) * λ / 4, Equation (3)

[0087] In the above Equation (3), λ is used to represent the wavelength of light, and m is an integer, such as m = 0, ±1, ±2,....

[0088] For the above Figure 1 and Figure 2 architectures of the two 1 / 4-wave plate layers, the differences are mainly shown in Table 1 below. As can be seen from Table 1, both architectures can only depolarize light of a specific wavelength and cannot depolarize light of multiple wavelengths.

[0089] Table 1

[0090]

[0091]

[0092] As shown in Table 1, the birefringence of the liquid crystal coating 12 can be 0.0625, the coating thickness can be 2 μm (micrometers), and the phase difference R0 = birefringence * coating thickness = 0.0625 * 2 = 0.125 μm. Thus, the main wavelength corresponding to this film can be calculated according to the above Equation (3):

[0093] λ = Δn * d * 4 / (2m + 1), Equation (4)

[0094] When m = 0, λ = 500 nm; when m = 1, λ = 166 nm. In the range of the wavelength of light from 380 nm to 780 nm (visible light band), the main wavelength corresponding to the liquid crystal coating 12 is 500 nm. That is to say, Figure 1 the polarization component shown can only convert light of the 500 nm band into circularly polarized light, and light of other bands is converted into elliptically polarized light. This will cause the ratio of the light intensities of the R (red) / G (green) / B (blue) three-color lights passing through to be different when viewed at different angles through a polarizing lens (sunglasses). Since white light is a mixture of RGB three colors, when the mixing ratio of the three primary colors changes, a color shift phenomenon will occur, seriously affecting the viewing effect.

[0095] As shown in Table 1, the birefringence of the cellulose acetate polymer film 22 can be 0.004, and the coating thickness can be 25 μm. Using the above method to calculate, the main wavelength of the cellulose acetate polymer film 22 can be obtained as 400 nm. That is to say, Figure 2 the polarization component shown can only convert light of the 400 nm band into circularly polarized light, and light of other bands is converted into elliptically polarized light. Similarly, when viewed at different angles, a color shift phenomenon will also occur, seriously affecting the viewing effect.

[0096] Figure 5 This is a schematic structural diagram of a polarization component provided by an embodiment of the present application. Refer to Figure 5 , the polarization component 30 includes: a first polarization layer 31, a second polarization layer 32, and a phase retardation film 33.

[0097] Among them, the first polarization layer 31 has a transmission axis, and the first polarization layer 31 is used to transmit linearly polarized light whose polarization direction is the direction of the transmission axis. The second polarization layer 32 is located on one side of the first polarization layer 31. The phase retardation film 33 is located on the side of the second polarization layer 32 away from the first polarization layer 31.

[0098] Among them, the light after passing through the first polarization layer 31 and the second polarization layer 32 is still linearly polarized light, and the phase retardation film 33 can convert the linearly polarized light after passing through the first polarization layer 31 and the second polarization layer 32 into circularly polarized light or elliptically polarized light, which is convenient to achieve the display effect of near-natural light.

[0099] It should be noted that the degree of polarization of light is used to measure the degree of polarization of light, and the absolute value of the degree of polarization ranges from 0 to 1. The absolute value of the degree of polarization being 0 means that the light is circularly polarized light, the absolute value of the degree of polarization being greater than 0 and less than 1 means that the light is elliptically polarized light, and the absolute value of the degree of polarization being 1 means that the light is linearly polarized light. In order to achieve the display effect of near-natural light, it is necessary to make the degree of polarization of the light after passing through the phase retardation film 33 as close to 0 as possible.

[0100] In the embodiment of the present application, the phase retardation film is used to make the first light fluctuate in a fixed cycle with a fixed degree of polarization as the vibration axis. The first light is light with a wavelength in the range of 380 nm to 780 nm (visible light band) after passing through the phase retardation film. Among them, the fixed cycle is greater than or equal to 20.

[0101] Among them, the first light includes a second light with a degree of polarization of zero, and the absolute value of the difference between adjacent two wavelengths in the second light is positively correlated with the wavelength of the second light. That is, the larger the wavelength of the second light, the larger the absolute value of the difference between adjacent two wavelengths in the second light; the smaller the wavelength of the second light, the smaller the absolute value of the difference between adjacent two wavelengths in the second light.

[0102] Optionally, the number of the second light with a degree of polarization of zero is positively correlated with the fixed cycle. The larger the fixed cycle, the larger the number of the second light with a degree of polarization of zero, and the smaller the fixed cycle, the smaller the number of the second light with a degree of polarization of zero. Since the fixed cycle is greater than or equal to 20, the number of the second light with a degree of polarization of zero can be made larger, that is, the polarization component can depolarize the light of multiple wavelengths in the visible light band and convert it into circularly polarized light, which is convenient to achieve the display effect of near-natural light, and the brightness difference and color deviation are small when the user views from different perspectives.

[0103] Alternatively, the degree of polarization of the first light ray at any wavelength is less than 0.5. That is to say, the degree of polarization of the first light ray at any wavelength is relatively small, so that the first light ray is close to circularly polarized light, facilitating the realization of a near-natural light display effect, and the brightness difference and color shift are small when the user views from different perspectives.

[0104] In summary, the embodiment of the present application provides a polarizing component, which includes a first polarizing layer, a second polarizing layer and a phase retardation film. The first polarizing layer is used to transmit light with a polarization direction along the light-transmitting axis direction. Since the number of second light rays with a zero degree of polarization after passing through the phase retardation film is large, or the degree of polarization of the first light ray at any wavelength after passing through the phase retardation film is relatively small, the brightness difference and color shift are small when the user views from different perspectives, facilitating the realization of a near-natural light display effect.

[0105] Optionally, referring to Figure 6 , the first polarizing layer 31 includes a first substrate layer 311, a linear polarizing layer 312 and a second substrate layer 313. The first substrate layer 311 and the second substrate layer 313 can be made of materials such as PET (polyethylene terephthalate) and TAC (triacetyl cellulose). The substrate layer has the characteristic of transparency and can play a role in supporting the entire linear polarizing layer. The linear polarizing layer 312 can be made of PVA (polyvinyl alcohol) and mainly plays a role in polarization.

[0106] Figure 7 is a schematic diagram of the degree of polarization curve of a light ray provided by the embodiment of the present application. Referring to Figure 7 It can be seen that in the range of the wavelength of the light ray from 380 nm to 780 nm, the fluctuation of the light ray shows a sine distribution, and the fluctuation of the light ray in the vertical direction conforms to the following formula (5).

[0107]

[0108] Among them, in the above formula (5), k = sin 2 (2α), 0 ≤ k ≤ 1. In the following embodiments, the second polarizing layer 32 has two implementation manners, and the meaning of α is different in the two manners. When the second polarizing layer 32 is a half-wave polarizing film, α is the angle between the light-transmitting axis direction of the first polarizing layer 31 and the light-transmitting axis direction of the second polarizing layer 32. When the second polarizing layer 32 is a phase retardation film 33, α is the angle between the light-transmitting axis direction of the first polarizing layer 31 and the optical axis direction of the phase retardation film 33. △n(λ) represents the refractive index difference at different wavelengths. Since some materials have dispersion (positive dispersion or inverse dispersion), the difference in refractive index will increase or decrease with the change of wavelength. The phase retardation film 33 in the embodiment of the present application has almost no dispersion phenomenon, so △n at different wavelengths shows the same performance. That is to say, P(λ) in the above formula (5) shows a sine distribution. However, referring toFigure 7 For Figure 7 , the slight dispersion existing in the high-phase-delay film 33 causes the peak value of the polarization degree fluctuation of the first light ray to be positively correlated with the wavelength of the first light ray, that is, the peak value of the polarization degree fluctuation of the first light ray increases as the wavelength of the first light ray increases.

[0109] Furthermore, it can be seen from the above formula (4) that when the phase difference △n*d remains unchanged, as the coefficient (2m + 1) continuously increases, the wavelength λ gradually decreases, that is, λ(m + 1) is less than λ(m).

[0110] Among them, Thus, it is calculated that:

[0111]

[0112] It can be seen from formula (6) that when the phase difference △n*d remains unchanged, as the coefficient m continuously increases, the wavelength difference λ(m) - λ(m + 1) gradually decreases; as the coefficient m continuously decreases, the wavelength difference λ(m) - λ(m + 1) gradually increases. Among them, the larger the wavelength difference, the smaller the fluctuation frequency of the first light ray, and the smaller the wavelength difference, the larger the fluctuation frequency of the first light ray. Thus, the conclusion can be drawn that the fluctuation frequency of the first light ray is negatively correlated with the wavelength of the first light ray, that is, the fluctuation frequency of the first light ray decreases as the wavelength of the first light ray increases.

[0113] As a first optional implementation manner, the second polarizing layer 32 is a half-wave polarizing film, and the half-wave polarizing film is used to generate M times of phase delay for the fifth light ray. Among them, the fifth light ray is the light ray after passing through the first polarizing layer 31, and M is an odd number of 1 / 2 wavelength of the fifth light ray. Among them, refer to Figure 8 , the optical axis direction of the half-wave polarizing film and the light transmission axis direction of the first polarizing layer 31 have a first included angle β, and the range of the first included angle β is from 12.5° to 32.5°. The optical axis direction of the phase-delay film 33 is parallel to the light transmission axis direction of the first polarizing layer 31.

[0114] In the embodiment of the present application, refer to Figure 9 , the half-wave polarizing film 32 may include a third substrate layer 321, a polarizing layer 322, and a fourth substrate layer 323. That is, the half-wave polarizing film 32 presents a sandwich structure. Among them, the third substrate layer 321 and the fourth substrate layer 323 may select polymer thin films with a transmittance ≥ 90%, such as selecting materials such as PET. The polarizing layer can achieve half-wave delay through liquid crystal alignment or external voltage drive, or a material layer such as a λ / 2 wave plate.

[0115] Among them, the half-wave polarizing film 32 generates a phase delay of an odd multiple of 1 / 2 wavelength of the fifth light ray for the fifth light ray. Thus, after the fifth light ray passes through the half-wave polarizing film 32, it remains linearly polarized light, denoted as the third light ray. Among them, the rotation angle of the polarization direction of the third light ray is: twice the included angle between the optical axis direction of the half-wave polarizing film 32 and the light-transmitting axis direction of the first polarizing layer 31.

[0116] Optionally, assuming that the included angle between the optical axis direction of the half-wave polarizing film 32 and the light-transmitting axis direction of the first polarizing layer 31 is 22.5 degrees, then the included angle between the polarization direction of the third light ray after passing through the half-wave polarizing film 32 and the light-transmitting axis direction of the first polarizing layer 31 is 45°. That is to say, relative to the fifth light ray, the polarization direction of the third light ray rotates by 45°.

[0117] Reference Figure 7 , the closer the included angle between the polarization direction of the third light ray after passing through the half-wave polarizing film 32 and the light-transmitting axis direction of the first polarizing layer 31 is to 45°, the closer the fixed polarization degree is to the polarization degree of the second light ray (i.e., closer to 0). That is, the smaller the absolute value of the difference between the first included angle between the optical axis direction of the half-wave polarizing film 32 and the light-transmitting axis direction of the first polarizing layer 31 and 22.5 degrees, the smaller the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray. And, the smaller the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray, the more circularly polarized light is converted, and the display is closer to the natural light display.

[0118] And, referring to Figure 7 , the greater the difference between the included angle between the polarization direction of the third light ray after passing through the half-wave polarizing film 32 and the light-transmitting axis direction of the first polarizing layer 31 and 45°, the greater the difference between the fixed polarization degree and the polarization degree of the second light ray (i.e., closer to 1). That is, the greater the absolute value of the difference between the first included angle between the optical axis direction of the half-wave polarizing film 32 and the light-transmitting axis direction of the first polarizing layer 31 and 22.5 degrees, the greater the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray. And, the greater the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray, the less circularly polarized light is converted.

[0119] For example, referring to Figure 7 , in the process that the included angle between the polarization direction of the third light ray after passing through the half-wave polarizing film 32 and the light-transmitting axis direction of the first polarizing layer 31 decreases from 45° to 20°, the difference between the fixed polarization degree and the polarization degree of the second light ray becomes larger and larger (i.e., the fixed polarization degree is getting closer and closer to 1).

[0120] As can be seen from the above analysis, the closer the included angle between the polarization direction of the third light ray after passing through the half-wave polarizing film 32 and the light transmission axis direction of the first polarizing layer 31 is to 45°, the closer its display is to the natural light display. Thus, the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray is positively correlated with the absolute value of the difference between the first included angle and 22.5°. That is to say, the first included angle can preferably be 22.5°.

[0121] In the embodiment of the present application, the phase retardation film 33 has anisotropic characteristics (i.e., has two different refractive indices). After natural light passes through the first polarizing layer 31 and the half-wave polarizing film 32, the third light ray passing through the half-wave polarizing film 32 can undergo phase retardation after passing through the phase retardation film 33. Optionally, the phase retardation film 33 can generate an N-fold phase retardation for the third light ray, where N is an odd number of 1 / 4 wavelengths of the third light ray.

[0122] Moreover, since the half-wave polarizing film 32 has already deflected the fifth light ray emitted from the first polarizing layer by 45°, the phase retardation film 33 only needs to perform phase retardation on the third light ray emitted from the half-wave polarizing film 32. Thus, the optical axis direction of the phase retardation film 33 can be parallel to the light transmission axis direction of the first polarizing layer 31.

[0123] In addition, the phase retardation film 33 can be selected from polymer resin films such as PET. By means of a biaxial stretching process, a high phase retardation difference can be prepared. When linearly polarized light is incident on the phase retardation film 33 and satisfies Δn*d = (2m + 1)*λ / 4 (m = 0, 1, 2...), it will perform a λ / 4 phase retardation on the linearly polarized light, converting the incident linearly polarized light into circularly polarized light or elliptically polarized light. And the larger the phase difference Δn*d, the more circularly polarized light is converted in the visible light band (380 nm to 780 nm), and the closer the display is to the natural light display.

[0124] Optionally, the material of the phase retardation film 33 can be an optical resin film, and the phase retardation film 33 is prepared by stretching the optical resin film. Refer to Figure 10 shows a schematic diagram of the optical axis direction during the stretching process of the optical resin film. The conveying direction of the optical resin film can be used as the X-axis direction, the direction perpendicular to the X-axis direction in the plane direction of the optical resin film can be used as the Y-axis direction, and the direction perpendicular to the plane direction of the optical resin film can be used as the Z-axis direction. In practical applications, by stretching the optical resin film along the X-axis direction and the Y-axis direction respectively, a phase retardation film 33 with an optical axis direction of the X-axis direction or the Y-axis direction can be obtained.

[0125] Among them, the refractive index is a measure of the polarizability of molecules. For the same type of polymer chain, for the refractive index in the plane along a specific direction, an increase in the refractive index is related to an increase in the degree of ordered arrangement of the molecular chain along this direction. A decrease in the refractive index in the direction perpendicular to the plane indicates an increase in the degree of orientation of the molecular chain in the plane direction.

[0126] In the embodiment of the present application, when the optical resin film is unidirectionally stretched in the X-axis direction, the refractive index nx of the optical resin film in the X-axis direction increases sharply with the increase of the strain rate (unit: second / S), while the refractive index ny of the optical resin film in the Y-axis direction and the refractive index nz of the optical resin film in the Z-axis direction both show a gradually decreasing trend, and the decreasing trend of ny is slight. This is mainly because during unidirectional stretching, the optical resin film cannot freely contract in the X-axis direction. When the optical resin film is simultaneously stretched in the X-axis direction and the Y-axis direction, nx and ny increase sharply with the increase of the strain rate, and nz decreases sharply. This is mainly because during simultaneous biaxial stretching, the stretching ratios are the same, nx and ny are basically the same, but the in-plane anisotropy is not obvious. When the optical resin film is successively stretched in the X-axis direction and the Y-axis direction, the refractive index in the direction of the second stretching increases with the increase of the strain rate, while the refractive index in the direction of the first stretching decreases, and nz continues to decrease on the basis of the first unidirectional stretching.

[0127] Reference Figure 10 Referring to, the three directions of the optical resin film are set as the X-axis direction, the Y-axis direction, and the Z-axis direction respectively, the stretching directions are the X-axis direction and the Y-axis direction, and the refractive indices of the corresponding three axes are nx, ny, and nz. Then the average refractive index n of the film = (nx + ny + nz) / 3. The degree of anisotropy after film stretching is △xy = nx - ny, and the in-plane orientation degree △(xy)z of the film = [(nx + ny) / 2] - nz.

[0128] When the optical resin film is unidirectionally stretched along the X-axis direction, the in-plane anisotropy degree △xy of the optical resin film increases sharply with the strain rate, while the in-plane orientation degree △(xy)z is always less than the anisotropy degree △xy. When the optical resin film is simultaneously stretched in the X-axis direction and the Y-axis direction, or when the optical resin film is successively stretched in the X-axis direction and the Y-axis direction, it can be found that the in-plane orientation degree △(xy)z increases with the strain rate, and the in-plane orientation degree △(xy)z is significantly greater than the anisotropy degree △xy. And comparing simultaneous biaxial stretching and successive biaxial stretching, successive biaxial stretching is more conducive to forming anisotropy in the film.

[0129] Optionally, orientation means that under the action of an external force, the molecular chains are arranged parallel to the direction of the external force. The unoriented material is isotropic, that is, its properties are the same in all directions. For the oriented material, its mechanical properties are enhanced in the orientation direction. The oriented material is anisotropic, that is, its properties are different in different directions. Generally, the orientation of materials has uniaxial orientation and biaxial orientation. In the embodiments of the present application, uniaxial stretching can form the uniaxial orientation of the film, and simultaneous biaxial stretching or sequential biaxial stretching can form the biaxial orientation of the film.

[0130] For the preparation of the phase retardation film 33, the selected optical resin film can be a PET film or a PC film. Both PET and PC are semi-crystalline materials, with a crystalline region and an amorphous region, and the crystalline region has a compact structure. After orientation stretching, the crystallinity of the PC film will increase significantly. In addition, when the film is stretched, the strength parallel to the stretching direction increases with the increase of the stretching ratio, while the strength perpendicular to the stretching direction decreases. Under certain temperature conditions, the larger the stretching ratio, the greater the degree of molecular chain orientation of the material, that is, the elongation at break of the film decreases, the impact strength, folding resistance increase, the mechanical strength increases, the modulus increases, and the air permeability and gloss performance are better.

[0131] Among them, unidirectional stretching can mainly increase the degree of anisotropy of the molecular chain orientation in the plane of the film (in-plane anisotropy), and biaxial stretching mainly improves the degree of molecular chain orientation in the plane of the film (plane orientation degree). That is, biaxial stretching forms a biaxial orientation, making the material anisotropic, the molecular chains are in a biaxial orientation state, and the higher the orientation degree, the higher the material performance. Therefore, in the specific implementation process, the phase retardation film 33 can be prepared by a sequential biaxial stretching process, and the temperature range during stretching is set to 95-100 °C (the heat distortion temperature of PET is 85 °C, and stretching is carried out after softening).

[0132] Optionally, the optical resin film includes at least one of a PET film and a PC film. Since the PET film and the PC film have the characteristics of light transmission and good stretching performance, when the optical resin film is a PET film or a PC film, it is convenient to biaxially stretch the optical resin film to form a phase retardation film 33 with biaxial anisotropic refractive index characteristics.

[0133] In the embodiments of the present application, the optical axis direction of the phase retardation film 33 is any one of the two stretching directions. Among them, the two stretching directions are perpendicular to each other. In practical applications, when the optical axis direction of the phase retardation film 33 is parallel to the light transmission axis direction of the first polarizing layer 31, the half-wave polarizing film can deflect the fifth light passing through the first polarizing layer 31 by 45°, and the phase retardation film 33 can retard the phase of the third light passing through the half-wave polarizing film.

[0134] In the embodiment of the present application, the phase delay film 33 can be prepared by bidirectional sequential stretching of an optical resin film, and the refractive indices in the two stretching directions of the bidirectional sequential stretching are different, that is, the phase delay film 33 has refractive indices in two directions and the refractive indices in the two directions are different. For example, the stretching directions of the optical resin film include a first direction and a second direction. The refractive indices of the phase delay film 33 in the first direction and the second direction are different.

[0135] Optionally, both the first direction and the second direction are parallel to the plane direction of the optical resin film, and the first direction and the second direction are perpendicular, so as to stretch the optical resin film along the plane direction of the optical resin film towards the first direction and the second direction, and obtain a phase delay film 33 with different refractive indices in the first direction and the second direction.

[0136] Exemplarily, the first direction can be the conveying direction of the optical resin film, and the second direction can be perpendicular to the conveying direction of the optical resin film. A polymer material such as a PET film is prepared into a polymer organic film with birefringence through processes such as polymerization, film formation, stretching, and surface processing. During the heating and stretching process, there are differences in the temperature / stretching rate of the molecules in the first direction and the second direction, and the molecular chains change to change the molecular orientation of the film. By changing the stretching method (uniaxial stretching, biaxial stretching, sequential stretching) and the change of the stretching rate, the molecules in the material can be arranged in an oriented manner, thereby preparing an anisotropic film.

[0137] Specifically, referring to Figure 11 , the current forming process flow of the phase delay film 33 includes inputting raw material particles → storage → drying → melting → cooling and forming → stretching in the first direction (which can be called longitudinal axis stretching) → stretching in the second direction (which can be called transverse axis stretching) → heat fixing → taking up the roll → cutting (cutting is not shown in the figure). Among them, by differentiating stretching parameters such as the stretching temperature and stretching rate in the first direction and the second direction, the molecular orientation of the optical resin film in the first direction and the second direction can be changed, so that the molecules in the optical resin film are distributed in an oriented manner and show different refractive indices in the first direction and the second direction.

[0138] As a second alternative implementation, the second polarizing layer 32 is a linear polarizing layer. Among them, the transmission axis direction of the second polarizing layer 32 is parallel to the transmission axis direction of the first polarizing layer 31. For example, the structure and function of the second polarizing layer 32 can be the same as those of the first polarizing layer 31. Optionally, the fifth light ray after passing through the first polarizing layer 31 can also pass through the second polarizing layer 32 to obtain the third light ray, and the polarization direction of the third light ray passing through the second polarizing layer 32 is the same as the polarization direction of the fifth light ray passing through the first polarizing layer 31. That is to say, the second polarizing layer 32 cannot deflect the fifth light ray by an angle. For the above reasons, in order to simplify the structure of the polarizing component 10, the first polarizing layer 31 and the second polarizing layer 32 included in the polarizing component 10 of the present application embodiment can be an integral linear polarizing film.

[0139] Furthermore, in order to enable the phase retardation film 33 to convert the third light ray into circularly polarized light (or elliptically polarized light), it is necessary to enable the phase retardation film 33 itself to deflect the linearly polarized light by an angle. Thus, the optical axis direction of the phase retardation film 33 and the transmission axis direction of the first polarizing layer 31 have a second included angle, and the range of the second included angle can be 35 degrees to 55 degrees. Thereby, the phase retardation film 33 can deflect the third light ray after passing through the first polarizing layer 31 and the second polarizing layer 32, and the deflection angle range is 35 degrees to 55 degrees.

[0140] Reference Figure 7 , the closer the second included angle between the optical axis direction of the phase retardation film 33 and the transmission axis direction of the first polarizing layer 31 is to 45 degrees, the closer the fixed polarization degree is to the polarization degree of the second light ray (i.e., closer to 0). That is, the smaller the absolute value of the difference between the second included angle and 45 degrees, the smaller the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray. And, the smaller the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray, the more circularly polarized light is converted, and the display is closer to the natural light display.

[0141] And, referring to Figure 7 , the greater the difference between the second included angle between the optical axis direction of the phase retardation film 33 and the transmission axis direction of the first polarizing layer 31 and 45°, the greater the difference between the fixed polarization degree and the polarization degree of the second light ray (i.e., closer to 1). That is, the larger the absolute value of the difference between the second included angle and 45°, the larger the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray. And, the larger the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray, the less circularly polarized light is converted.

[0142] As can be seen from the above analysis, the closer the second included angle between the optical axis direction of the phase retardation film 33 and the transmission axis direction of the first polarizing layer 31 is to 45°, the closer the display is to the natural light display. Thus, the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray is positively correlated with the absolute value of the difference between the second included angle and 45°. That is to say, the second included angle can preferably be 45°.

[0143] In the embodiment of the present application, the phase retardation film 33 has anisotropic characteristics (that is, the phase retardation film has refractive indexes in two directions and the refractive indexes in the two directions are different). After natural light passes through the first polarizing layer 31 and the second polarizing layer 32, the third light ray transmitted through the second polarizing layer 32 can undergo phase retardation after passing through the phase retardation film 33. Optionally, the phase retardation film 33 can generate N times of phase retardation for the third light ray, and N is an odd number of 1 / 4 wavelengths of the third light ray.

[0144] In addition, the phase retardation film 33 can be selected from polymer resin films such as PET. By means of a biaxial stretching process, a high phase retardation difference can be prepared. When linearly polarized light is incident on the high phase retardation film 33 and satisfies Δn*d = (2m + 1)*λ / 4 (m = 0, 1, 2...), it will perform a phase retardation of λ / 4 on the linearly polarized light, converting the incident linearly polarized light into circularly polarized light. Moreover, the larger the phase difference Δn*d is, the more circularly polarized light is converted in the visible light band (380 nm to 780 nm), and the closer the display is to the natural light display.

[0145] Optionally, the material of the phase retardation film 33 can be an optical resin film, and the phase retardation film 33 is prepared by biaxial successive stretching of the optical resin film. The reason for using biaxial successive stretching for preparation can refer to the specific description in the first implementation manner above, and the embodiment of the present application will not elaborate here.

[0146] Among them, the preparation method in the second implementation manner and the preparation method in the first implementation manner are different in that: the included angle between the two stretching directions is 45°. That is to say, the stretching direction of the stretching process in the first implementation manner is changed from the initial longitudinal axis stretching → transverse axis stretching to longitudinal stretching → oblique stretching (refer to Figure 11 the third direction stretching in). (The included angle between the oblique stretching direction and the longitudinal stretching direction is 45°). In this way, the included angle between the optical axis direction of the phase retardation film 33 and the transmission axis direction of the first polarizing layer 31 can be 45°. The optical axis of the phase retardation film 33 prepared by this process is 45°, and its main process flow remains unchanged, and the difference lies in the change of the stretching direction.

[0147] In the embodiments of the present application, the first polarizing layer 31, the second polarizing layer 32, and the phase retardation film 33 are obtained by cutting after laminating the rolls of the first polarizing layer 31, the rolls of the second polarizing layer 32, and the rolls of the phase retardation film 33. Among them, the rolls of the first polarizing layer 31, the rolls of the second polarizing layer 32, and the rolls of the phase retardation film 33 are laminated in any one of the following three methods.

[0148] Method 1: The roll of the phase retardation film 33 and the roll of the second polarizing layer 32 are compounded and transferred, and the roll of the first polarizing layer 31 is bonded to the side of the roll of the second polarizing layer 32 away from the roll of the phase retardation film 33, thereby obtaining a composite roll.

[0149] Method 2: The roll of the second polarizing layer 32 and the roll of the first polarizing layer 31 are compounded and bonded, and the roll of the phase retardation film 33 is bonded to the side of the roll of the second polarizing layer 32 away from the roll of the first polarizing layer 31, thereby obtaining a composite roll.

[0150] Method 3: Refer to Figure 12 and Figure 13 , the roll of the phase retardation film 33 and the roll of the first polarizing layer 31 are arranged on both sides of the roll of the second polarizing layer 32, and the roll of the phase retardation film 33 and the roll of the second polarizing layer 32, as well as the roll of the second polarizing layer 32 and the roll of the first polarizing layer 31 are compounded and bonded, thereby obtaining a composite roll.

[0151] In the above Method 1 to Method 3, a protective film can also be provided on the side of the roll of the phase retardation film 33 away from the roll of the second polarizing layer 32 to prevent damage to the roll. In the above Method 1 and Method 2, two rolls are bonded first, and then the third roll is bonded. In the above Method 3, the three rolls are bonded at one time. Therefore, the lamination method of Method 3 is more efficient.

[0152] Moreover, it can be seen from the above three lamination methods that the high-phase retardation film, the second polarizing layer, and the first polarizing layer can all be prepared into rolls first, and the three-layer film materials can be laminated in a roll-to-roll manner. Subsequently, in order to apply them to products, the composite roll can be cut according to product requirements, which can improve material utilization and meet the application of large-size products at the same time. Therefore, the relationship between the transmission axis direction of the first polarizing layer 31, the transmission axis direction of the second polarizing layer 32, and the optical axis direction of the phase retardation film 33 is related to the directions of the three rolls.

[0153] In the second implementation manner, if the two stretching directions of the roll of the phase retardation film 33 are perpendicular, directly laminating and then cutting the three rolls cannot ensure that the optical axis direction of the phase retardation film 33 and the optical axis direction of the first polarizing layer 31 form a 45° angle, and thus cannot be converted into circularly polarized light.

[0154] That is, referring to Figure 14 , if the two stretching directions of the web of the phase retardation film 33 are perpendicular, it is necessary to first cut the web of the phase retardation film 33 at a 45° angle to obtain a sheet of the phase retardation film 33. Then, the sheet of the phase retardation film 33 is bonded to the web of the first polarizing layer 31 and the web of the second polarizing layer 32. This method will result in material waste of the web of the phase retardation film 33.

[0155] Therefore, in the second implementation manner of the present application, by directly adjusting the included angle between the stretching directions of the two stretches of the phase retardation film 33, not only can the angle requirement be met, but also the waste of the web can be avoided.

[0156] In the embodiment of the present application, in the second implementation manner, it is also possible to convert the light of 24 wavelengths into circularly polarized light, so that the linearly polarized light in multiple bands in the visible light band can be converted into circularly polarized light, achieving the effect of full-view achromatic display.

[0157] That is, the phase retardation film 33 can deflect the angle and delay the phase of the third light passing through the first polarizing layer 31 and the second polarizing layer 32. Moreover, the phase difference between the first light and the third light is large, so the linearly polarized light in multiple bands in the visible light band can be converted into circularly polarized light, achieving the effect of full-view achromatic display. In addition, the polarizing component 30 in the embodiment of the present application also avoids the operation of additionally adding a liquid crystal layer or a cellulose acetate polymer film, and has a simple structure and is easy to implement.

[0158] In the embodiment of the present application, it is assumed that the first polarizing layer 31 and the second polarizing layer 32 can be an integral linear polarizing film, such as Figure 6 the linear polarizing layer 312 therein may include the linear polarizing layer in the first polarizing layer 31 and the linear polarizing layer in the second polarizing layer 32, and the first substrate layer 311 and the second substrate layer 313 are the common film layers of the first polarizing layer 31 and the second polarizing layer 32. Optionally, the phase retardation film 33, the first polarizing layer 31, and the second polarizing layer 32 may be of a composite structure. Referring to Figure 15 , the second substrate layer 313 is directly replaced with the phase retardation film 33. Or, the phase retardation film 33, the first polarizing layer 31, and the second polarizing layer 32 may be of an externally bonded type. Referring to Figure 16 , the phase retardation film 33 is bonded to the side of the second substrate layer 313 away from the first substrate layer 311.

[0159] In the embodiment of the present application, the degree of polarization of white light can be used as an evaluation criterion for the degree of conversion of linearly polarized light into circularly polarized light. Assuming that the first light includes a fourth light of white color, the degree of polarization of the fourth light satisfies:

[0160] Degree of polarization of the fourth light ray = (Lmax - Lmin) / (Lmax + Lmin), Formula (7)

[0161] In the above Formula (7), Lmax is the maximum brightness value of the fourth light ray, and Lmin is the minimum brightness value of the fourth light ray. Among them, the degree of polarization of white light is determined by detecting the maximum brightness value and the minimum brightness value. Refer to Figure 17 As shown, the degree of polarization detection device may include a detector 01, a polarizer 02, a display screen 03, and a backlight 04. Among them, the display screen 03 refers to the display screen 03 with a polarizing component capable of transmitting circularly polarized light (when testing different polarizing component samples, it is replaced with the display screen 03 of different polarizing components). The polarizer 02 here uses a linear polarizing film. During the test, the display screen 03 to be tested is placed on the backlight 04 and lit, and the polarizer 02 is rotated within the plane of 0 to 360°, and the brightness passing through the polarizer 02 at different rotation angles is tested. Among them, the maximum value of the brightness is Lmax, and the minimum value of the brightness is Lmin. The principle is that the light emitted by the backlight 04 is approximately regarded as natural light, and after passing through the display screen 03 with the polarizing component 30, it becomes linearly polarized light, circularly polarized light, or elliptically polarized light, or all three. After passing through a linear polarizing light polarizer 02 on the display screen 03, the polarizer 02 is rotated to test the brightness after passing through the polarizer 02. If the light passing through the display screen 03 is linearly polarized light, there will be an obvious change from bright to dark, that is, when the light transmission axis of the polarizer 02 is parallel to the optical axis of the upper polarizing component of the display screen 03, all the light passes through and the brightness is the highest. When the light transmission axis of the polarizer 02 is perpendicular to the optical axis of the upper polarizing component of the display screen 03, no light passes through and the brightness is the lowest. Similarly, if the brightness tested at each rotation angle of the rotated polarizer 02 is the same, the effect of converting linearly polarized light into circularly polarized light is the best. That is, when the degree of polarization is 0, it means circularly polarized light; when the degree of polarization is 1, it means linearly polarized light; when the degree of polarization is between 0 and 1, it means elliptically polarized light, and the closer the value is to 1, the stronger the circular polarization of the polarized light. In this way, the conversion efficiency of the polarization state of light can be effectively calculated and determined.

[0162] In the embodiment of the present application, within the range of the wavelength of the light ray from 380 nm to 780 nm, the difference in the refractive indices of the two directions of the phase retardation film 33 is greater than 0.1. The thickness range of the phase retardation film 33 can be from 45 μm to 125 μm, and the phase retardation amounts of the first light ray and the third light ray can be greater than 8 μm. In addition, assuming that the second polarizing layer 32 is a half-wave polarizing film, the half-wave polarizing film 32 also has anisotropic characteristics (that is, the half-wave polarizing film has refractive indices in two directions, and the refractive indices in the two directions are different), and the difference in the refractive indices of the two directions of the half-wave polarizing film 32 can be half of the difference in the refractive indices of the two directions of the phase retardation film 33, such as the difference in the refractive indices of the two directions of the half-wave polarizing film 32 is greater than 0.05.

[0163] Table 2

[0164]

[0165] As shown in Table 2, when the strain rate is 35, the difference between the refractive index in the first direction and the refractive index in the second direction of the phase delay film 33 can reach 0.105. When the thickness of the phase delay film 33 is 80 μm, the phase delay amount (phase difference) Δn*d of the phase delay film 33 satisfies: Δn*d = 80 * 1000 * 0.105 = 8400 nm = 8.4 μm.

[0166] Assume that the first included angle between the optical axis direction of the half-wave polarizing film 32 and the light transmission axis direction of the first polarizing layer 31 is 22.5°. Then, according to the formula (4) λ = Δn*d*4 / (2m + 1), and m takes values of 0, 1, 2......, it can be calculated that among all wavelengths, there are 24 wavelengths in the visible light band (the wavelength range of the light is from 380 nm to 780 nm). That is to say, the phase delay film 33 can convert the light of 24 wavelengths into circularly polarized light, so as to achieve the effect of converting linearly polarized light in multiple bands in the visible light band into circularly polarized light and realizing full-view non-color-biased display.

[0167] In the first implementation manner of the present application, the half-wave polarizing film 32 deflects the fifth light ray after passing through the first polarizing layer 31, and the third light ray after passing through the half-wave polarizing film is still linearly polarized light. The phase delay film 33 can directly perform phase delay on the third light ray after passing through the half-wave polarizing film. Moreover, the phase difference between the first light ray and the third light ray is large. Therefore, linearly polarized light in multiple bands in the visible light band can be converted into circularly polarized light, realizing full-view non-color-biased display. In addition, the polarizing component 10 in the embodiment of the present application also avoids the operation of additionally adding a liquid crystal layer or a cellulose acetate polymer film, and has a simple structure and is easy to implement.

[0168] It can be seen from the above Table 2 that the polarization degree of the fourth light ray (white light) in the solution of the present application is 3.4%, that is, less than 5%, which is difficult to be detected by the human eye. While the polarization degrees of white light in Architecture 1 and Architecture 2 are relatively large and are easy to be recognized by the human eye. And in the solution of the present application, within the wavelength range of the light from 380 nm to 780 nm, the full-view color deviation ΔEab of the light vertically passing through the polarizing component is less than 5 JND (Just Noticeable Difference). While in Architecture 1 and Architecture 2, the full-view color deviation ΔEab is relatively large and the display effect is relatively poor. Among them, the full-view color deviation ΔEab is the color deviation evaluation standard in the current display field.

[0169] Experimental verification result comparison:

[0170] Exemplarily, taking the display screens 03 of 55 inches and 32 inches as platforms, samples with two display modes were built for technical verification. Structure 1 is the display screen 03 with a polarizing component of a liquid crystal coating, and the solution of the present application is the display screen 03 with a polarizing component of a biaxially sequentially stretched optical resin film.

[0171] Specifically, under white (W), red (R), green (G), and blue (B) screens, the brightness and chromaticity coordinate changes were measured after rotating the analyzer 02. Table 3 shows the polarization degree performance of the first implementation mode of the embodiment of the present application, Table 4 shows the polarization degree performance of the second implementation mode of the embodiment of the present application, and Table 5 shows the polarization degree performance of Structure 1.

[0172] It can be seen from Table 3 to Table 5 that the polarization degrees of the two implementation modes of the present application are smaller than that of Structure 1, indicating that the depolarization effect of the solution of the present application is the best, more linearly polarized light can be converted into circularly polarized light, and the brightness change difference at each viewing angle through the analyzer 02 is small.

[0173] Table 3

[0174]

[0175] Table 4

[0176]

[0177] Table 5

[0178]

[0179]

[0180] Reference Figures 18 to 21 It can be seen that whether it is a white (W) screen, a red (R) screen, a green (G) screen or a blue (B) screen, with the change of the analyzer angle, the brightness change degree of the two solutions of the embodiment of the present application is smaller than that of Structure 1, indicating that the two solutions of the embodiment of the present application have better brightness uniformity compared with Structure 1.

[0181] Reference Figures 22 to 29 It can be seen that whether it is a white screen, a red screen, a green screen or a blue screen, with the change of the analyzer angle, the change degree of the chromaticity coordinates (x and y) of the two solutions of the embodiment of the present application is smaller than that of the chromaticity coordinates of Structure 1, indicating that the two solutions of the embodiment of the present application have less color deviation and are not visible to visual observation compared with Structure 1.

[0182] In practical applications, the smaller the degree of polarization, the lower the proportion of linearly polarized light and the higher the proportion of circularly polarized light. The ideal value is that the degree of polarization = 0, which means the proportion of linearly polarized light is 0, but it is actually very difficult to achieve. According to the performance of actual products, for the polarizing component of the embodiment of the present application, the degree of polarization of the fourth ray (white light) can be less than 5%. For example, the degree of polarization of white light in Table 3 is 1.46%, and the degree of polarization of white light in Table 4 is 3.19%.

[0183] In addition, when analyzing the polarization of the solution of Architecture 1, the display effect diagram as shown in Figure 30 is obtained. As can be seen from Figure 30 , the brightness shows a periodic change of 180°. When analyzing the polarization from 0° to 90°, the brightness gradually decreases to the minimum brightness. When analyzing the polarization from 90° to 180°, the brightness gradually increases from the minimum brightness to the maximum brightness. The chromaticity shows a periodic change of 180°. When analyzing the polarization from 0° to 90°, the color temperature gradually increases, gradually changing from a warm color tone (yellowish) to a cold color tone (bluish). When analyzing the polarization from 90° to 180°, the color temperature gradually decreases from high to low.

[0184] When analyzing the polarization of the solution of the present application, the display effect diagram as shown in Figure 31 is obtained. As can be seen from Figure 31 , the brightness shows that when the analyzer 02 is rotated from 0° to 180°, the brightness does not change significantly. The chromaticity shows that when the analyzer 02 is rotated from 0° to 180°, the chromaticity does not change significantly.

[0185] Table 6

[0186]

[0187] Furthermore, for the second implementation manner, the second included angle γ between the optical axis direction of the phase retardation film 33 and the transmission axis direction of the first polarizing layer 31 is taken as 45°, 40°, 35°, 30°, 25°, and 20°, and the above Table 6 and Figure 32 .

[0188] In the above Table 6, ΔL is used to represent the brightness change. Wxy is used to represent the color coordinate difference obtained by rotating the analyzer 02 for testing under a white screen. For example, ΔWx and ΔWy represent the difference in white color coordinates. Rxy is used to represent the color coordinate difference obtained by rotating the analyzer 02 for testing under a red screen. For example, ΔRx and ΔRy represent the difference in red coordinates. Gxy is used to represent the color coordinate difference obtained by rotating the analyzer 02 for testing under a green screen. For example, ΔGx and ΔGy represent the difference in green coordinates. Bxy is used to represent the color coordinate difference obtained by rotating the analyzer 02 for testing under a blue screen. For example, ΔGx and ΔGy represent the difference in blue coordinates.

[0189] Combined with Table 6 and Figure 32It can be seen that at different second included angles γ and different analyzer angles, there is no color deviation difference in the picture, only brightness difference. The brightness is the highest when the analyzer angle is 45°, and the lowest when the analyzer angle is 135°. The analyzer angle can refer to the included angle between the polarization direction of the analyzer 02 and the light transmission axis direction of the first polarization layer.

[0190] In addition, as the second included angle γ gradually changes from 45° to 20° (45° → 20°), the brightness difference at different analyzer angles increases as the second included angle γ decreases. That is, when the second included angle γ is 45°, the brightness difference at different analyzer angles is the smallest, and when the second included angle γ is 20°, the brightness difference at different analyzer angles is the largest.

[0191] From the display picture of the solution of the present application, when the second included angle γ is less than or equal to 30° (γ ≤ 30°), when the analyzer angle is 135°, the picture is significantly darker to the naked eye. From the display picture shown by Structure 1, the chromaticity difference is large at different analyzer angles, significantly yellowish at 0° and 180°, and significantly bluish at 90°.

[0192] It should be noted that for the liquid crystal display products with linearly polarized light, the liquid crystal display products corresponding to Structure 1, and the liquid crystal display products corresponding to the solution of the present application, the advantages of the present application are analyzed as follows:

[0193] Traditional polarizers and sunglasses both belong to linearly polarized sheets. The brightness is the highest when their light transmission axes are parallel, and the brightness is zero when their light transmission axes are perpendicular, in the off-black state, and the picture is invisible. Due to the off-black state, it is not suitable for sunglasses-free display.

[0194] Structure 1 (quarter-wave plate): The white point coordinates drift after the backlight, as the incident light, passes through sunglasses with different light transmission axes. The main reason is that affected by the quarter-wave plate, only light of a specific wavelength can be converted into circularly polarized light, and light of other wavelength bands is converted into elliptically polarized light. After passing through the polarizing component composed of the quarter-wave plate, the transmission ratios of RGB change, and the transmission ratio B > G > R. That is to say, the polarizing component composed of the quarter-wave plate has a high optical rotation efficiency for short-wave blue light (approximate to circularly polarized light). As the wavelength increases, the optical rotation efficiency decreases, and the elliptical polarization property increases. The quarter-wave plate has different optical rotation efficiencies for monochromatic light, resulting in serious color deviation, so the display effect of sunglasses-free display is limited.

[0195] The solution of this application: The difference from Architecture 1 is that after the polymer material is stretched bidirectionally and successively, its phase retardation amount is large, and light of multiple wavelengths in the first line can be converted into circularly polarized light. After passing through sunglasses with different light transmission axes, the RGB ratio changes slightly, and the white point coordinates hardly change, that is, there is no color deviation problem, which is suitable for visible display of sunglasses, and at the same time, the function of preventing eye fatigue is also achieved.

[0196] In addition, from Figure 7 It can also be seen that when α is 45°, the degree of polarization of the first light ray changes periodically (that is, the first light ray fluctuates with a fixed degree of polarization as the vibration axis and a fixed period). And as the wavelength of the first light ray increases, the peak value of the degree of polarization fluctuation of the first light ray gradually increases, and the fluctuation bandwidth (the fluctuation bandwidth refers to the absolute value of the difference between two adjacent wavelengths in the second light ray) gradually increases. There is no bright-dark difference and no color deviation at different analyzer angles.

[0197] When α is not 45°, the degree of polarization of the first light ray also changes periodically. As the wavelength of the first light ray increases, the change amplitude of the degree of polarization of the first light ray significantly decreases. As α gradually decreases from 45° to 20°, the difference between the fixed degree of polarization of the first light ray and the degree of polarization of the second light ray gradually increases, and the polarized light gradually changes to linearly polarized light. Therefore, if α is not 45°, there will be a bright-dark difference but no color deviation difference in the picture at different analyzer angles. And as α gradually decreases from 45° to 20°, the bright-dark difference gradually increases.

[0198] For Architecture 1 (quarter-wave plate), when the light ray fluctuates within the visible light band, the degree of polarization of the light ray also changes periodically, but the light ray does not change periodically with a fixed degree of polarization as the vibration axis, but has a certain slope of vibration. The circularly polarized light shows a single wavelength, and the light rays of other wavelengths are converted into elliptically polarized light, and as the wavelength increases, the ellipticity increases until it is converted into linearly polarized light.

[0199] In summary, the polarization component includes a first polarization layer, a second polarization layer, and a phase retardation film. The first polarization layer is used to transmit light with the polarization direction along the light transmission axis direction, and the phase retardation film is used to generate a phase retardation that is an odd multiple of 1 / 4 of the light wavelength for the light ray passing through the first polarization layer and the second polarization layer. Since the number of light rays with a polarization degree of 0 after passing through the phase retardation film is large, or the polarization degrees of the light rays at different wavelengths after passing through the phase retardation film are relatively small, the brightness difference and color deviation are small when the user views from different perspectives, which is convenient to achieve the display effect of near-natural light.

[0200] Figure 33 It is a flowchart of a preparation method of a polarization component provided by an embodiment of this application. Refer to Figure 33 , this method includes:

[0201] Step S101: Use an optical resin film to form a roll of a phase retardation film.

[0202] In the embodiment of the present application, the optical resin film can be stretched to form a roll of a phase retardation film, so that the roll of the phase retardation film has anisotropic characteristics. Optionally, the optical resin film can include, but is not limited to, any one of a PET film or a PC film.

[0203] Optionally, the optical resin film is stretched into a roll of a phase retardation film by a biaxial sequential stretching process. Specifically, in the process of heating and stretching the optical resin film, the optical resin film can be stretched first in a first direction and then in a second direction. By differentiating the stretching parameters such as the stretching temperature and stretching rate in the first direction and the second direction, the molecular orientation of the optical resin film in the first direction and the second direction can be changed, so that the molecules in the optical resin film are distributed in an oriented manner and exhibit different refractive indexes in the first direction and the second direction.

[0204] In the embodiment of the present application, the step of using an optical resin film to form a roll of a phase retardation film 33 may include the following sub-steps:

[0205] Sub-step S1011: Stretch the optical resin film in a first direction.

[0206] In the embodiment of the present application, the first direction is parallel to the plane direction of the optical resin film, so as to facilitate stretching the optical resin film in the first direction along the plane direction of the optical resin film.

[0207] Exemplarily, the first direction can be the conveying direction of the optical resin film.

[0208] Sub-step S1012: Stretch the optical resin film in a second direction to obtain a roll of a phase retardation film.

[0209] In the embodiment of the present application, the second direction is parallel to the plane direction of the optical resin film, so as to facilitate stretching the optical resin film in the second direction along the plane direction of the optical resin film.

[0210] If the second polarizing layer is a half-wave polarizing film (refer to the first implementation manner of the above embodiment), then the second direction is perpendicular to the first direction. That is, the second direction is perpendicular to the conveying direction of the optical resin film. If the second polarizing layer is a linear polarizing layer (refer to the second implementation manner of the above embodiment), then the included angle range between the second direction and the first direction is 35° to 55°, for example, 45°. That is, the included angle range between the second direction and the conveying direction of the optical resin film is 35° to 55°.

[0211] In some alternative embodiments of the present application, after stretching the optical resin film into a roll of retardation film by a bidirectional sequential stretching process, the roll of retardation film can also be subjected to a surface hardening treatment to increase the surface hardness of the roll of retardation film, so that the roll of retardation film has the function of resisting scratches. And / or, the roll of retardation film is subjected to an anti-glare treatment to make the roll of retardation film have an anti-glare display effect.

[0212] Step S102: The roll of the first polarizing layer, the roll of the second polarizing layer, and the roll of the retardation film are sequentially arranged and adhesively bonded to obtain a composite roll.

[0213] In the embodiments of the present application, the roll of the first polarizing layer, the roll of the second polarizing layer, and the roll of the retardation film can be fed in as rolls respectively, and the adjacent two layers are adhesively connected to obtain a composite roll.

[0214] In the embodiments of the present application, if the roll of the second polarizing layer is a roll of half-wave polarizing film, the first included angle between the optical axis direction of the roll of the half-wave polarizing film and the transmission axis direction of the roll of the first polarizing layer can be 22.5°. If the roll of the second polarizing layer is a roll of linearly polarized layer, the second included angle between the optical axis direction of the roll of the retardation film and the transmission axis direction of the roll of the first polarizing layer can be 45°.

[0215] In the embodiments of the present application, the method of adhesively bonding the roll of the first transparent protective layer, the roll of the linearly polarized layer, and the roll of the substrate layer to obtain a composite roll can be any one of the following three methods.

[0216] Method 1: The roll of the retardation film 33 and the roll of the second polarizing layer 32 are compounded and transferred, and the roll of the first polarizing layer 31 is adhesively bonded to the side of the roll of the second polarizing layer 32 away from the roll of the retardation film 33, so as to obtain a composite roll.

[0217] Method 2: The roll of the second polarizing layer 32 and the roll of the first polarizing layer 31 are adhesively bonded, and the roll of the retardation film 33 is adhesively bonded to the side of the roll of the second polarizing layer 32 away from the roll of the first polarizing layer 31, so as to obtain a composite roll.

[0218] Method 3: The roll of the retardation film 33 and the roll of the first polarizing layer 31 are arranged on both sides of the roll of the second polarizing layer 32, and the roll of the retardation film 33 and the roll of the second polarizing layer 32, and the roll of the second polarizing layer 32 and the roll of the first polarizing layer 31 are adhesively bonded, so as to obtain a composite roll.

[0219] The solution of this application does not require first cutting the coil material of the phase retardation film at a 45° angle to obtain a sheet of the phase retardation film 33. Instead, a high-phase retardation film, a second polarizing layer, and a first polarizing layer are first prepared into a coil material, and the three film materials can be laminated in a roll-to-roll manner. Subsequently, in order to apply it to a product, the composite coil material can be cut according to the product requirements, which can improve material utilization and at the same time meet the application of large-sized products. Thus, the relationship between the transmission axis direction of the first polarizing layer 31, the optical axis direction of the second polarizing layer 32, and the optical axis direction of the phase retardation film 33 is related to the directions of the three coil materials.

[0220] Step S103: Cut the composite coil material to obtain a polarizing component.

[0221] In the embodiments of this application, the composite coil material can be cut according to the needs of the actual product. And it can be cut along the width direction of the composite coil material without diagonal cutting, which can avoid waste of the coil material.

[0222] In the embodiments of this application, the first polarizing layer 31 has a transmission axis, and the first polarizing layer 31 is used to transmit linearly polarized light with a polarization direction along the transmission axis direction. The second polarizing layer 32 is located on one side of the first polarizing layer 31. The phase retardation film 33 is located on the side of the second polarizing layer 32 away from the first polarizing layer 31.

[0223] Among them, the third light ray after passing through the first polarizing layer 31 and the second polarizing layer 32 is still linearly polarized light, and the phase retardation film 33 can convert the third light ray after passing through the first polarizing layer 31 and the second polarizing layer 32 into circularly polarized light or elliptically polarized light, which is convenient for realizing the display effect of near-natural light.

[0224] It should be noted that the degree of polarization of light is used to measure the polarization degree of light, and the absolute value of the degree of polarization ranges from 0 to 1. The absolute value of the degree of polarization being 0 means that the light is circularly polarized light, the absolute value of the degree of polarization being greater than 0 and less than 1 means that the light is elliptically polarized light, and the absolute value of the degree of polarization being 1 means that the light is linearly polarized light. In order to realize the display effect of near-natural light, it is necessary to make the degree of polarization of the light after passing through the phase retardation film 33 as close to 0 as possible or equal to 0.

[0225] In the embodiments of this application, the phase retardation film is used to make the first light ray fluctuate in a fixed period with a fixed degree of polarization as the vibration central axis. The first light ray is the light ray with a wavelength in the range of 380 nm to 780 nm (visible light band) after passing through the phase retardation film. Among them, the fixed period is greater than or equal to 20.

[0226] Among them, the first light ray includes a second light ray with a polarization degree of zero. The absolute value of the difference between adjacent two wavelengths in the second light ray is positively correlated with the wavelength of the second light ray. That is, the larger the wavelength of the second light ray, the larger the absolute value of the difference between adjacent two wavelengths in the second light ray; the smaller the wavelength of the second light ray, the smaller the absolute value of the difference between adjacent two wavelengths in the second light ray.

[0227] Optionally, the number of the second light rays with a polarization degree of zero is positively correlated with the fixed period. The larger the fixed period, the larger the number of the second light rays with a polarization degree of zero; the smaller the fixed period, the smaller the number of the second light rays with a polarization degree of zero. Since the fixed period is greater than or equal to 20, the number of the second light rays with a polarization degree of zero can be made larger. That is, the polarizing component can depolarize the light of multiple wavelengths in the visible light band and convert it into circularly polarized light, which is convenient for realizing the display effect of near-natural light, and the brightness difference and color deviation are small when the user views from different perspectives.

[0228] Or the polarization degree of the first light ray of any wavelength is less than 0.5. That is, the polarization degree of the first light ray of any wavelength is relatively small, so that the first light ray is close to circularly polarized light, which is convenient for realizing the display effect of near-natural light, and the brightness difference and color deviation are small when the user views from different perspectives.

[0229] In summary, the embodiment of the present application provides a preparation method of a polarizing component. The polarizing component includes a first polarizing layer, a second polarizing layer and a phase retardation film. The first polarizing layer is used to transmit light with a polarization direction along the light transmission axis direction. Since the number of the second light rays with a polarization degree of zero is large after passing through the phase retardation film, or the polarization degree of the first light ray of any wavelength after passing through the phase retardation film is relatively small, the brightness difference and color deviation are small when the user views from different perspectives, which is convenient for realizing the display effect of near-natural light.

[0230] Figure 34 It is a schematic structural diagram of a display device provided by an embodiment of the present application. Refer to Figure 34 It can be seen that the display device includes: a display panel 40 and the polarizing component 30 described in the above embodiment. The polarizing component 30 is located on the light-emitting side of the display panel 40.

[0231] Optionally, refer to Figure 34 , the display device further includes: a backlight source 50 and a third polarizing layer 60. The backlight source 50 is located on the side of the display panel 40 away from the polarizing component 30. The backlight source 50 is used to provide backlight for the display panel 40. The third polarizing layer 60 is located between the backlight source 50 and the display panel 40. The light transmission axis direction of the first polarizing layer 60 is perpendicular to the light transmission axis direction of the first polarizing layer 31 in the polarizing component 30.

[0232] Refer to Figure 35, taking the second polarizing layer 32 in the polarizing component 30 as a half-wave polarizing film as an example, the light emitted by the backlight source 50 can be approximately regarded as natural light. The light emitted by the backlight source 50 is converted into linearly polarized light after passing through the third polarizing layer 60, and the polarization direction of this linearly polarized light is the light transmission axis direction of the third polarizing layer 60. This linearly polarized light is converted into elliptically polarized light after passing through the liquid crystal in the display panel 40, and the light parallel to the light transmission axis direction of the first polarizing layer 31 in this elliptically polarized light passes through the first polarizing layer 31, that is, the light after passing through the first polarizing layer 31 is linearly polarized light (the fifth light), and the polarization direction of the fifth light is the light transmission axis direction of the first polarizing layer 31. Then, this fifth light is still linearly polarized light (the third light) after passing through the half-wave polarizing film 32, but the polarization direction rotates by 45°. Finally, the third light is modulated by the phase retardation film 33 into circularly polarized light or elliptically polarized light (the second light).

[0233] In Figure 35 , a small dot and a small dash at the position of the backlight source 60 are used to represent approximate natural light. The small dots located between the liquid crystal of the display panel 40 and the backlight source 60 are all used to represent that the polarization direction of the linearly polarized light is perpendicular to the light transmission axis direction of the first polarizing layer 31. A small dot and two small dashes above the liquid crystal in the display panel 40, as well as a small dot and two small dashes above the display panel 40 are all used to represent elliptically polarized light. The two small dashes above the first polarizing layer 31 are used to represent that the polarization direction of the linearly polarized light is the light transmission axis direction of the first polarizing layer 31, and the two oblique dashes above the half-wave polarizing film 32 are used to represent that the polarization direction of the linearly polarized light forms a certain angle (such as 45°) with the light transmission axis direction of the first polarizing layer 31. The circular arrow above the phase retardation film 33 is used to represent circularly polarized light or elliptically polarized light.

[0234] Since the display device can have basically the same technical effects as the polarizing component described in the previous embodiment, for the sake of brevity, the technical effects of the display device are not described again here.

[0235] The terms used in the implementation part of this application are only used to explain the embodiments of this application, and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in the implementation of this application should be the ordinary meanings understood by those with general skills in the field to which this application belongs.

[0236] The terms used in the embodiments section of this application are only for the purpose of explaining the embodiments of this application and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second", "third" and similar words used in the patent application specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not denote a quantity limitation, but rather indicate the presence of at least one. Words such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0237] The above are only optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

1. A polarization component, characterized in that, The polarizing component includes: A first polarizing layer having a transmission axis, and the first polarizing layer is configured to transmit linearly polarized light with a polarization direction along the direction of the transmission axis; A second polarizing layer located on one side of the first polarizing layer; And a phase retardation film located on the side of the second polarizing layer away from the first polarizing layer. The phase retardation film is configured to cause a first light ray to fluctuate in a fixed period with a fixed polarization degree as the vibration central axis. The first light ray is a light ray with a wavelength in the range of 380 nm to 780 nm after passing through the phase retardation film, and the fixed period is greater than or equal to 20; wherein, the first light ray includes a second light ray with a polarization degree of zero, and the absolute value of the difference between adjacent two wavelengths of the second light ray is positively correlated with the wavelength value of the second light ray; or, the polarization degree of the first light ray at any wavelength is less than 0.

5.

2. The polarization component according to claim 1, wherein, The phase retardation film is further configured to make the peak value of the polarization degree fluctuation of the first light ray positively correlated with the wavelength of the first light ray, and / or make the fluctuation frequency of the first light ray negatively correlated with the wavelength of the first light ray.

3. The polarizing component according to claim 1 or 2, characterized in that, The direction of the transmission axis of the second polarizing layer and the direction of the transmission axis of the first polarizing layer have a first included angle, and the range of the first included angle is 12.5 degrees to 32.5 degrees. The direction of the optical axis of the phase retardation film is parallel to the direction of the transmission axis of the first polarizing layer; or, The direction of the transmission axis of the second polarizing layer is parallel to the direction of the transmission axis of the first polarizing layer, and the direction of the optical axis of the phase retardation film and the direction of the transmission axis of the first polarizing layer have a second included angle, and the range of the second included angle is 35 degrees to 55 degrees.

4. The polarizing component according to claim 1 or 2, wherein The absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray is positively correlated with the absolute value of the difference between the first included angle and 22.5 degrees, where the first included angle is the included angle between the direction of the transmission axis of the second polarizing layer and the direction of the transmission axis of the first polarizing layer; or, The absolute value of the difference between the fixed polarization degree and the polarization degree of the second light ray is positively correlated with the absolute value of the difference between the second included angle and 45 degrees, where the second included angle is the included angle between the direction of the optical axis of the phase retardation film and the direction of the transmission axis of the first polarizing layer.

5. The polarizing component according to claim 1 or 2, characterized in that The direction of the transmission axis of the second polarizing layer and the direction of the transmission axis of the first polarizing layer have a first included angle, and the first included angle is 22.5 degrees; or, The direction of the optical axis of the phase retardation film and the direction of the transmission axis of the first polarizing layer have a second included angle, and the second included angle is 45 degrees.

6. The polarizing component according to claim 1 or 2, characterized in that, The phase retardation film has refractive indices in two directions, and the difference between the refractive indices in the two directions is greater than 0.

1.

7. The polarizing component according to claim 6, wherein The two directions are perpendicular to each other, or the included angle between the two directions is 45 degrees.

8. The polarizing component according to claim 6, wherein The direction of the optical axis of the phase retardation film is any one of the two directions.

9. The polarizing component according to claim 1 or 2, characterized in that, The second polarizing layer has refractive indices in two directions, and the difference between the refractive indices in the two directions is greater than 0.

05.

10. The polarizing component according to claim 1 or 2, characterized in that, The thickness range of the phase retardation film is 45 microns to 125 microns.

11. The polarizing component according to claim 1 or 2, characterized in that, The phase retardation amount of the first light ray and the third light ray is greater than 8 microns, and the third light ray is the light ray after passing through the second polarizing layer.

12. The polarizing component according to claim 1 or 2, characterized in that, The phase retardation film is also used to make the full-view angular deviation of the second light ray less than 5 JND.

13. The polarizing component according to claim 1 or 2, characterized in that, The first light ray includes a fourth light ray with a white color, and the degree of polarization of the fourth light ray is less than 5%.

14. A method for preparing a polarizing component, characterized in that, The method includes: Forming a roll of the phase retardation film using an optical resin film; Sequentially arranging and compounding and bonding a roll of the first polarizing layer, a roll of the second polarizing layer, and a roll of the phase retardation film to obtain a composite roll; Cutting the composite roll to obtain a polarizing component, and one of the length direction and the width direction of the cut polarizing component is parallel to the width direction of the composite roll; Wherein, the first polarizing layer in the polarizing component has a transmission axis, the first polarizing layer is used to transmit linearly polarized light with a polarization direction along the transmission axis direction, the second polarizing layer in the polarizing component is located on one side of the first polarizing layer, the phase retardation film in the polarizing component is located on the side of the second polarizing layer away from the first polarizing layer, the phase retardation film is used to make the first light ray fluctuate in a fixed period with a fixed degree of polarization as the vibration central axis, the first light ray is a light ray with a wavelength in the range of 380 nm to 780 nm after passing through the phase retardation film, and the fixed period is greater than or equal to 20; wherein, the second light ray includes a second light ray with a polarization degree of zero, and the absolute value of the difference between two adjacent wavelengths in the second light ray is positively correlated with the wavelength value of the second light ray; or, the degree of polarization of the first light ray at any wavelength is less than 0.

5.

15. A display device, characterized in that, The display device includes: a display panel, and a polarizing component as described in any one of claims 1 to 13, and the polarizing component is located on the light-emitting side of the display panel.

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