Polarizing assembly and manufacturing method therefor, and display device

Abstract

A polarizing assembly (30) and a manufacturing method therefor, and a display device, relating to the technical field of display. The polarizing assembly (30) comprises a first polarizing layer (31), a second polarizing layer (32), and a phase retardation film (33). The first polarizing layer (31) is used for transmitting linearly polarized light with the polarization direction aligned to a light-transmissive axis direction. The number of second light rays having passed through the phase retardation film (33) and having zero degree of polarization is relative large, or all first light rays of any wavelength having passed through the phase retardation film (33) have a relatively low degree of polarization, and therefore, when a user views the display device from different viewing angles, both the brightness difference and color cast are small, thereby facilitating the achievement of a near-natural light display effect.

Description

Polarizing component and preparation method thereof, and display device

[0001] This disclosure claims priority to Chinese patent application No. 202410047551.7 filed on January 11, 2024, entitled “Polarizing assembly, preparation method thereof, and display device.” The entire contents of the above case are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of display technology, and in particular to a polarizing component, a preparation method thereof, and a display device. Background Art

[0003] With the development of display technology, users are increasingly demanding higher functional requirements for display devices. For example, customers in the conference and classroom field often require display devices to have low blue light and anti-eye fatigue functions, while customers of outdoor display products generally require display devices to have near-natural light display capabilities. Summary of the Invention

[0004] The present application provides a polarizing assembly, a method for manufacturing the same, and a display device. The technical solutions are as follows:

[0005] In one aspect, a polarizing assembly is provided, comprising:

[0006] a first polarizing layer, wherein the first polarizing layer has a transmission axis and is configured to transmit linearly polarized light having a polarization direction in the direction of the transmission axis;

[0007] a second polarizing layer, the second polarizing layer being located on one side of the first polarizing layer;

[0008] And, a phase delay film, wherein the phase delay film is located on the side of the second polarizing layer away from the first polarizing layer, the phase delay film is used to make the first light fluctuate with a fixed period with a fixed polarization degree as the vibration axis, the first light is the light with a wavelength in the range of 380nm to 780nm after passing through the phase delay 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 two adjacent wavelengths in the second light is positively correlated with the wavelength value of the second light; or, the polarization degree of the first light of any wavelength is less than 0.5.

[0009] Optionally, the phase retardation film is further used to make the polarization degree fluctuation peak 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.

[0010] Optionally, the transmission axis direction of the second polarizing layer and the transmission axis direction of the first polarizing layer have a first angle, the first angle ranges from 12.5 degrees to 32.5 degrees, and the optical axis direction of the phase retardation film is parallel to the transmission axis direction of the first polarizing layer; or

[0011] The transmission axis of the second polarizing layer is parallel to the transmission axis of the first polarizing layer. The optical axis of the phase retardation film and the transmission axis of the first polarizing layer have a second angle, and the second angle ranges from 35 degrees to 55 degrees.

[0012] Optionally, the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light is positively correlated with the absolute value of the difference between a first angle and 22.5 degrees, where the first angle is the angle between the transmission axis direction of the second polarizing layer and the transmission axis direction of the first polarizing layer; or

[0013] The absolute value of the difference between the fixed polarization degree and the polarization degree of the second light is positively correlated with the absolute value of the difference between the second angle and 45 degrees, where the second angle is the angle between the optical axis direction of the phase retardation film and the transmission axis direction of the first polarizing layer.

[0014] Optionally, a transmission axis direction of the second polarizing layer and a transmission axis direction of the first polarizing layer form a first angle, and the first angle is 22.5 degrees; or

[0015] The optical axis direction of the phase retardation film and the light transmission axis direction of the first polarizing layer have a second angle, and the second angle is 45 degrees.

[0016] 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.

[0017] Optionally, the two directions are perpendicular to each other, or the angle between the two directions is 45 degrees.

[0018] Optionally, the optical axis direction of the phase retardation film is any one of the two directions.

[0019] 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.

[0020] Optionally, the thickness of the phase delay film ranges from 45 microns to 125 microns.

[0021] Optionally, the phase delay between the first light and the third light is greater than 8 microns, and the third light is the light after passing through the second polarizing layer.

[0022] Optionally, the phase retardation film is further configured to make the full viewing angle chromatic deviation of the second light less than 5 JND.

[0023] Optionally, the first light includes a fourth light of white color, and a polarization degree of the fourth light is less than 5%.

[0024] In another aspect, a method for preparing a polarizing assembly is provided, the method comprising:

[0025] A roll of phase retardation film formed using an optical resin film;

[0026] The roll of the first polarizing layer, the roll of the second polarizing layer, and the roll of the phase retardation film are sequentially arranged and compositely bonded to obtain a composite roll;

[0027] Cutting the composite coil to obtain polarizing components, wherein one of the length direction and the width direction of the cut polarizing components is parallel to the width direction of the composite coil;

[0028] In which, the first polarizing layer in the polarizing assembly has a transmission axis, and the first polarizing layer is used to transmit linearly polarized light with a polarization direction in the direction of the transmission axis. The second polarizing layer in the polarizing assembly is located on one side of the first polarizing layer, and the phase delay film in the polarizing assembly is located on a side of the second polarizing layer away from the first polarizing layer. The phase delay film is used to make the first light fluctuate with a fixed polarization degree as the vibration axis with a fixed period. The first light is light with a wavelength in the range of 380nm to 780nm after passing through the phase delay film, and the fixed period is greater than or equal to 20; wherein, the second light includes a second light with a polarization degree of zero, and the absolute value of the difference between two adjacent wavelengths in the second light is positively correlated with the wavelength value of the second light; or, the polarization degree of the first light of any wavelength is less than 0.5.

[0029] On the other hand, a display device is provided, comprising: a display panel, and the polarizing component as described in the above aspect, wherein the polarizing component is located on the light-emitting side of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] FIG1 is a schematic structural diagram of a polarizing assembly in the related art;

[0032] FIG2 is a schematic structural diagram of another polarizing assembly in the related art;

[0033] FIG3 is a schematic diagram of a change in refractive index when natural light passes through a material having birefringence characteristics provided by an embodiment of the present application;

[0034] FIG4 is a schematic diagram of the phase difference of natural light after passing through a material with birefringence characteristics provided by an embodiment of the present application;

[0035] FIG5 is a schematic structural diagram of a polarizing assembly provided in an embodiment of the present application;

[0036] FIG6 is a schematic structural diagram of a first polarizing layer provided in an embodiment of the present application;

[0037] FIG7 is a schematic diagram of a polarization degree curve of light provided in an embodiment of the present application;

[0038] FIG8 is a schematic diagram of the optical axis direction of a half-wave polarizing film provided in an embodiment of the present application;

[0039] FIG9 is a schematic structural diagram of a half-wave polarizing film provided in an embodiment of the present application;

[0040] FIG10 is a schematic diagram of the optical axis direction during the stretching process of an optical resin film provided in an embodiment of the present application;

[0041] FIG11 is a schematic diagram of a process flow for forming a phase retardation film according to an embodiment of the present application;

[0042] FIG12 is a schematic diagram of laminating a phase retardation film roll, a second polarizing layer roll, and a first polarizing layer roll provided in an embodiment of the present application;

[0043] FIG13 is a schematic diagram of laminating another phase retardation film roll, a second polarizing layer roll, and a first polarizing layer roll provided in an embodiment of the present application;

[0044] FIG14 is a schematic diagram of cutting a phase retarder film roll at a 45° angle provided in an embodiment of the present application;

[0045] FIG15 is a schematic diagram of a composite structure of a phase retardation film, a first polarizing layer, and a second polarizing layer provided in an embodiment of the present application;

[0046] FIG16 is a schematic diagram of an externally laminated phase retardation film, a first polarizing layer, and a second polarizing layer provided in an embodiment of the present application;

[0047] FIG17 is a schematic structural diagram of a polarization degree detection device provided in an embodiment of the present application;

[0048] FIG18 is a brightness curve diagram of a white screen provided by an embodiment of the present application;

[0049] FIG19 is a brightness curve diagram of a red screen provided by an embodiment of the present application;

[0050] FIG20 is a brightness curve diagram of a green screen provided by an embodiment of the present application;

[0051] FIG21 is a brightness curve diagram of a blue screen provided by an embodiment of the present application;

[0052] FIG22 is a graph showing a color coordinate x under a white screen provided by an embodiment of the present application;

[0053] FIG23 is a graph showing a color coordinate x of a red image provided by an embodiment of the present application;

[0054] FIG24 is a graph showing a color coordinate x under a green screen according to an embodiment of the present application;

[0055] FIG25 is a graph showing a color coordinate x under a blue screen according to an embodiment of the present application;

[0056] FIG26 is a graph showing a color coordinate y of a white screen provided by an embodiment of the present application;

[0057] FIG27 is a graph showing a color coordinate y of a red image provided by an embodiment of the present application;

[0058] FIG28 is a graph showing a color coordinate y of a green screen according to an embodiment of the present application;

[0059] FIG29 is a graph showing a color coordinate y of a blue screen according to an embodiment of the present application;

[0060] FIG30 is a diagram showing the effect of performing polarization analysis on the solution of Architecture 1 provided in an embodiment of the present application;

[0061] FIG31 is a diagram showing the effect of performing polarization analysis on the solution of the present application, provided in an embodiment of the present application;

[0062] FIG32 is a diagram showing the effect of polarization analysis at different polarization analysis angles provided by an embodiment of the present application;

[0063] FIG33 is a flow chart of a method for preparing a polarizing assembly according to an embodiment of the present application;

[0064] FIG34 is a schematic structural diagram of a display device provided in an embodiment of the present application;

[0065] Figure 35 is a structural schematic diagram of another display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0066] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0067] In the related art, in order to enable the display device to have the functions of preventing eye fatigue and displaying near natural light, a circularly polarized light display solution is usually adopted.

[0068] However, existing circularly polarized light display solutions are not only complex in structure, but can only convert light of a specific wavelength into circularly polarized light. The effect of converting circularly polarized light is poor, which leads to large brightness differences and color deviations when users watch at different viewing angles.

[0069] With the promotion and popularization of fifth-generation mobile communication technology (5G), smart IoT has entered the public eye and is developing rapidly. It is rapidly and widely applied in many fields, including smart cities, smart transportation, smart healthcare, smart conferencing, smart education, and smart car networking. Customers in the conferencing and education sectors are demanding green and healthy eye-protection displays, requiring products with low blue light and anti-eye fatigue features. Signage customers, when promoting bus stops and display boards, especially outdoor display products, are demanding circularly polarized light displays and near-natural light displays. Overseas customers in Europe and the United States have strong demands for this technology, and this technical requirement has been defined as a necessary technical indicator for entering overseas markets.

[0070] Research on the effects of linearly polarized and circularly polarized light on the human eye has found that prolonged use of LCD display products can cause symptoms such as dry eyes, eye pain, and blurred vision. Furthermore, the study found a significant difference in blinking frequency between LCD products using linearly polarized light and those using circularly polarized light, with the blinking frequency significantly higher for LCD products using linearly polarized light than for those using circularly polarized light. This demonstrates that circularly polarized light can effectively reduce eye fatigue and provide eye protection, compared to linearly polarized light.

[0071] In fact, the human eye's light spot area contains lutein, arranged in a circular pattern, which absorbs light in the blue-violet band. Circularly polarized light can activate lutein in more areas of the eye than linearly polarized light, allowing it to absorb more light and reduce visual fatigue.

[0072] In prior art, a QWP (Quarterwaveplate) technology solution is typically used to convert circularly polarized light. Specifically, the QWP layer is primarily fabricated using birefringent materials such as liquid crystal coatings or birefringent crystals. The QWP layer can phase-delay linearly polarized light and convert it into circularly polarized light, making the emitted light closer to natural light, achieving a near-natural light display effect and reducing eye fatigue. In specific applications, the QWP layer can be a liquid crystal coating or a cellulose acetate polymer film.

[0073] Figure 1 is a schematic diagram of a polarizing assembly in the related art. Referring to Figure 1 , the polarizing assembly 10 may include: a linear polarizing layer 11 and a liquid crystal coating 12. The liquid crystal coating 12 has a birefringence characteristic.

[0074] Specifically, after natural light passes through the linear polarization layer 11, light with a polarization direction parallel to the linear polarization layer 11 is allowed to pass through, while light with other polarization directions is absorbed. Because the liquid crystal coating 12 has a birefringence characteristic, the linearly polarized light passing through the linear polarization layer 11 can undergo phase retardation after passing through the liquid crystal coating 12, becoming circularly polarized light.

[0075] FIG2 is a schematic diagram of the structure of another polarizing assembly in the related art. Referring to FIG2 , the polarizing assembly 20 may specifically include: a linear polarizing layer 21 and a cellulose acetate polymer film 22. The cellulose acetate polymer film 22 has a birefringence characteristic.

[0076] Specifically, after natural light passes through the linear polarization layer 21, light with a polarization direction parallel to the linear polarization layer 21 is allowed to pass through, while light with other polarization directions is absorbed. Because the cellulose acetate polymer film 22 has a birefringence characteristic, the linearly polarized light passing through the linear polarization layer 21 can undergo phase retardation after passing through the cellulose acetate polymer film 22, becoming circularly polarized light.

[0077] However, since the liquid crystal coating 12 and the cellulose acetate polymer film 22 have relatively low birefringence and are relatively thin, the phase delay is also correspondingly small. Therefore, only light of a specific wavelength can be depolarized and converted into circularly polarized light, which can easily lead to incomplete polarization and color shift when viewed at different viewing angles.

[0078] 3 , which shows a schematic diagram of a change in refractive index when natural light passes through a material having birefringence characteristics, and FIG. 4 , which shows a schematic diagram of a phase difference after natural light passes through a material having birefringence characteristics.

[0079] Figure 3 shows a birefringent coordinate system represented by a birefringent ellipsoid, with the ellipsoid's center O as the origin and the intersection of the starting meridian plane and the equatorial plane as the X-axis. The direction perpendicular to X on the equatorial plane is the Y-axis, and the ellipsoid's rotation axis is the Z-axis. This forms the coordinate system O-XYZ. When a beam of light S is incident on a crystal at an angle θ, birefringence occurs. The horizontal ellipse where OB is located is the o light wavefront. The o light is ordinary light and propagates in the crystal in accordance with the law of refraction, i.e., it propagates in the OB direction, with a refractive index of no. The OZ direction is the e light wavefront. The e light is extraordinary light and does not follow the law of refraction when propagating in the crystal, i.e., it propagates in the OA direction, with a refractive index of ne(θ).

[0080] Since the phase velocities of the two orthogonal light 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 δ will be generated. The phase retardation δ can be calculated using the following formula: δ = 2π*Δn*d / λ Formula (1)

[0081] Where λ = 2π = 360°, Δn = ne-no, and d is the thickness of the film layer. The phase difference R0 can be calculated using the following formula: R0 = Δn*d Formula (2)

[0082] When the amplitudes of the o-light and the e-light are the same, the wavelength represented by the o-light and the wavelength represented by the e-light are exactly 1 / 4 of the period λ. Therefore, after a beam of linearly polarized light is incident on a birefringent material, the polarization state is converted from linear polarization to circular polarization, and the phase difference Δn*d satisfies: Δn*d=(2m+1)*λ / 4 Formula (3)

[0083] In the above formula (3), λ is used to represent the wavelength of light, and m is an integer, such as m=0, ±1, ±2, etc.

[0084] The main differences between the two quarter-wave plate architectures in Figures 1 and 2 are shown in Table 1. As can be seen from Table 1, both architectures can only depolarize light of a specific wavelength, and cannot depolarize light of multiple wavelengths.

[0085] Table 1

[0086] 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. Therefore, the dominant wavelength corresponding to the film can be calculated according to the above formula (3): λ = Δn * d * 4 / (2m + 1) Formula (4)

[0087] When m = 0, λ = 500nm; when m = 1, λ = 166nm. Within the wavelength range of 380nm to 780nm (visible light band), the dominant wavelength corresponding to the liquid crystal coating 12 is 500nm. That is, the polarizing assembly shown in FIG1 can only convert light in the 500nm band into circularly polarized light, while light in other bands is converted into elliptically polarized light. This will result in different light intensity ratios of the R (red) / G (green) / B (blue) light transmitted at different viewing angles when viewed through polarizing glasses (sunglasses). White light is a mixture of RGB. When the mixing ratio of the three primary colors changes, color cast will occur, seriously affecting the viewing effect.

[0088] 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 calculation method, it can be determined that the dominant wavelength of the cellulose acetate polymer film 22 is 400 nm. This means that the polarizing element shown in Figure 2 can only convert light in the 400 nm wavelength band into circularly polarized light, while light in other wavelength bands is converted into elliptically polarized light. Similarly, viewing at different angles will also produce color shift, seriously affecting the viewing experience.

[0089] FIG5 is a schematic diagram of the structure of a polarizing assembly provided in an embodiment of the present application. Referring to FIG5 , the polarizing assembly 30 includes: a first polarizing layer 31 , a second polarizing layer 32 and a phase retardation film 33 .

[0090] The first polarizing layer 31 has a transmission axis and is configured to transmit linearly polarized light whose polarization direction is along the transmission axis. The second polarizing layer 32 is located on one side of the first polarizing layer 31. The phase retarder film 33 is located on the side of the second polarizing layer 32 away from the first polarizing layer 31.

[0091] Among them, the light after passing through the first polarizing layer 31 and the second polarizing layer 32 is still linearly polarized light, and the phase delay film 33 can convert the linearly polarized light after passing through the first polarizing layer 31 and the second polarizing layer 32 into circularly polarized light or elliptically polarized light, so as to achieve a display effect close to natural light.

[0092] It should be noted that the degree of polarization (DOP) of light is used to measure the degree of polarization of the light. The absolute value of the DOP ranges from 0 to 1. An absolute value of 0 indicates circular polarization of the light; an absolute value greater than 0 and less than 1 indicates elliptically polarized light; and an absolute value of 1 indicates linear polarization. To achieve a display effect close to natural light, the DOP of the light passing through the phase retarder film 33 must be as close to or as close to zero as possible.

[0093] In the embodiment of the present application, the phase retarder film is used to cause a first light ray to fluctuate with a fixed period around a fixed polarization axis. The first light ray, after passing through the phase retarder film, has a wavelength in the range of 380 nm to 780 nm (visible light band). The fixed period is greater than or equal to 20.

[0094] The first light includes a second light with zero polarization degree, and the absolute value of the difference between two adjacent wavelengths in the second light is positively correlated with the wavelength of the second light. That is, the greater the wavelength of the second light, the greater the absolute value of the difference between two adjacent wavelengths in the second light; and the smaller the wavelength of the second light, the smaller the absolute value of the difference between two adjacent wavelengths in the second light.

[0095] Optionally, the number of second light rays with zero polarization is positively correlated with the fixed period. A larger fixed period increases the number of second light rays with zero polarization, and a smaller fixed period decreases the number of second light rays with zero polarization. Since the fixed period is greater than or equal to 20, the number of second light rays with zero polarization can be increased. This means that the polarizing assembly can depolarize light at multiple wavelengths within the visible light band and convert it into circularly polarized light, facilitating a near-natural light display effect. Brightness differences and color shift are minimized when viewed from different viewing angles.

[0096] Alternatively, the polarization degree of the first light of any wavelength is less than 0.5. In other words, the polarization degree of the first light of any wavelength is relatively small, so that the first light is close to circularly polarized light, which facilitates the realization of a display effect close to natural light, and the brightness difference and color shift are small when the user is viewed from different viewing angles.

[0097] In summary, the embodiments of the present application provide a polarizing assembly comprising a first polarizing layer, a second polarizing layer, and a phase retarder film. The first polarizing layer is configured to transmit light having a polarization direction aligned with the transmission axis. Since a large number of second light rays having a zero polarization degree pass through the phase retarder film, or a relatively low polarization degree of first light rays of any wavelength pass through the phase retarder film, brightness differences and color shifts are minimized when viewed from different viewing angles, facilitating a near-natural light display effect.

[0098] 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 layers are transparent and can support the entire linear polarizing layer. The linear polarizing layer 312 can be made of PVA (polyvinyl alcohol) and primarily serves to polarize light.

[0099] FIG7 is a schematic diagram of a polarization curve of light provided in an embodiment of the present application. Referring to FIG7 , it can be seen that within the wavelength range of 380 nm to 780 nm, the fluctuation of the light is sinusoidally distributed, and the fluctuation of the light in the vertical direction conforms to the following formula (5).

[0100] In the above formula (5), k = sin 2(2α), 0≤k≤1. In the following embodiments, the second polarizing layer 32 has two implementation methods, and the meaning of α in the two methods is different. In the case where the second polarizing layer 32 is a half-wave polarizing film, α is the angle between the light transmission axis direction of the first polarizing layer 31 and the light transmission axis direction of the second polarizing layer 32. In the case where the second polarizing layer 32 is a phase delay film 33, α is the angle between the light transmission axis direction of the first polarizing layer 31 and the optical axis direction of the phase delay film 33. △n(λ) represents the refractive index difference at different wavelengths, because some materials have dispersion (positive dispersion or reverse dispersion), and the difference in refractive index will increase or decrease with the change of wavelength. The phase delay film 33 in the embodiment of the present application has almost no dispersion phenomenon, so the △n performance at different wavelengths is consistent. That is, P(λ) in the above formula (5) presents a sinusoidal distribution. However, referring to FIG7 , the slight dispersion of the high phase retardation film 33 causes the polarization fluctuation peak of the first light to be positively correlated with the wavelength of the first light, that is, the polarization fluctuation peak of the first light increases as the wavelength of the first light increases.

[0101] Furthermore, according to the above formula (4), when the phase difference Δn*d remains unchanged, as the coefficient (2m+1) increases, the wavelength λ gradually decreases, that is, λ(m+1) is smaller than λ(m).

[0102] in, From this, we can calculate:

[0103] From formula (6), it can be seen that when the phase difference △n*d remains unchanged, as the coefficient m continues to increase, the wavelength difference λ(m)-λ(m+1) gradually decreases; as the coefficient m continues to decrease, the wavelength difference λ(m)-λ(m+1) gradually increases. A larger wavelength difference indicates a smaller fluctuation frequency of the first light, and a smaller wavelength difference indicates a larger fluctuation frequency of the first light. From this, it can be concluded that the fluctuation frequency of the first light is negatively correlated with the wavelength of the first light, that is, the fluctuation frequency of the first light decreases as the wavelength of the first light increases.

[0104] As a first optional implementation, the second polarizing layer 32 is a half-wave polarizing film, which is used to produce M times the phase delay of the fifth light. The fifth light is the light after passing through the first polarizing layer 31, and M is an odd number of 1 / 2 wavelength of the fifth light. Referring to Figure 8, the optical axis direction of the half-wave polarizing film and the transmission axis direction of the first polarizing layer 31 have a first angle β, and the range of the first angle β is 12.5° to 32.5°. The optical axis direction of the phase delay film 33 is parallel to the transmission axis direction of the first polarizing layer 31.

[0105] In the embodiment of the present application, referring 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. In other words, the half-wave polarizing film 32 has a sandwich structure. The third substrate layer 321 and the fourth substrate layer 323 may be made of a polymer film with a transmittance of ≥90%, such as PET. The polarizing layer can achieve half-wave retardation through liquid crystal alignment, external voltage drive, or a layer of material such as a λ / 2 wave plate.

[0106] The half-wave polarizing film 32 produces a phase delay on the fifth light beam that is an odd multiple of half its wavelength. As a result, the fifth light beam remains linearly polarized after passing through the half-wave polarizing film 32, referred to as the third light beam. The third light beam's polarization direction is rotated by an angle equal to twice the angle between the optical axis of the half-wave polarizing film 32 and the transmission axis of the first polarizing layer 31.

[0107] Alternatively, assuming that the angle between the optical axis of the half-wave polarizing film 32 and the transmission axis of the first polarizing layer 31 is 22.5 degrees, the angle between the polarization direction of the third light ray after passing through the half-wave polarizing film 32 and the transmission axis of the first polarizing layer 31 is 45 degrees. In other words, the polarization direction of the third light ray is rotated by 45 degrees relative to the fifth light ray.

[0108] Referring to Figure 7, the closer the angle between the polarization direction of the third light ray after passing through the half-wave polarizing film 32 and the transmission axis of the first polarizing layer 31 is to 45°, the closer the fixed polarization degree is to that of the second light ray (i.e., the closer it is to 0). Specifically, the smaller the absolute value of the difference between the first angle between the optical axis of the half-wave polarizing film 32 and the transmission axis 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. Furthermore, 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 closer the display is to natural light.

[0109] Furthermore, referring to Figure 7 , the greater the difference between the angle between the polarization direction of the third light ray after passing through the half-wave polarizing film 32 and the transmission axis 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., the closer it is to 1). Specifically, the greater the absolute value of the difference between the first angle between the optical axis of the half-wave polarizing film 32 and the transmission axis 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. Furthermore, 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.

[0110] For example, referring to Figure 7, as the angle between the polarization direction of the third light after passing through the half-wave polarizing film 32 and the transmission 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 becomes larger and larger (that is, the fixed polarization degree becomes closer and closer to 1).

[0111] From the above analysis, it can be seen that the closer the angle between the polarization direction of the third light after passing through the half-wave polarizing film 32 and the transmission axis of the first polarizing layer 31 is to 45°, the closer the display is to natural light. Therefore, the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light is positively correlated with the absolute value of the difference between the first angle and 22.5°. In other words, the first angle can preferably be 22.5°.

[0112] In the embodiment of the present application, the phase retarder film 33 has anisotropic characteristics (i.e., it 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 passing through the half-wave polarizing film 32 can be phase delayed after passing through the phase retarder film 33. Optionally, the phase retarder film 33 can cause a phase delay of N times the third light, where N is an odd number equal to 1 / 4 of the wavelength of the third light.

[0113] Furthermore, since the half-wave polarizing film 32 has already deflected the fifth light emitted from the first polarizing layer 31 by 45 degrees, the phase retarder film 33 only needs to phase-retard the third light emitted from the half-wave polarizing film 32. Thus, the optical axis of the phase retarder film 33 can be made parallel to the transmission axis of the first polarizing layer 31.

[0114] In addition, the phase retardation film 33 can be made of a polymer resin film such as PET, and a high phase retardation difference can be produced through a biaxial stretching process. When linearly polarized light is incident on the phase retardation film 33, which satisfies Δn*d = (2m+1)*λ / 4 (m = 0, 1, 2...), the linearly polarized light is phase-delayed by λ / 4, converting the incident linearly polarized light into circularly polarized light or elliptically polarized light. Furthermore, the greater the phase difference Δn*d, the more circularly polarized light is converted in the visible light band (380nm to 780nm), and the closer the display is to natural light.

[0115] Alternatively, the phase retarder film 33 can be made of an optical resin film, which is prepared by stretching the film. Figure 10 shows a schematic diagram of the optical axis during the stretching process of the optical resin film. The transport direction of the optical resin film can be defined as the X-axis, the direction perpendicular to the X-axis within the plane of the optical resin film can be defined as the Y-axis, and the direction perpendicular to the plane of the optical resin film can be defined as the Z-axis. In practical applications, by stretching the optical resin film along the X-axis and Y-axis directions, respectively, a phase retarder film 33 can be obtained whose optical axis is oriented along either the X-axis or the Y-axis.

[0116] Among them, the refractive index is a measure of the polarizability of a molecule. For the same polymer chain, the increase in the refractive index along a specific direction in the plane is related to the increase in the degree of orderly arrangement of the molecular chain along this direction. The decrease in the refractive index perpendicular to the plane indicates that the degree of orientation of the molecular chain along the plane direction increases.

[0117] In the embodiment of the present application, when the optical resin film is uniaxially 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: seconds / 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 tend to gradually decrease, and the decrease trend of ny is slight. This is mainly because the optical resin film cannot shrink freely in the X-axis direction during uniaxial stretching. When the optical resin film is stretched in the X-axis and Y-axis directions simultaneously, nx and ny increase sharply with the increase of the strain rate, and nz decreases sharply. This is mainly because when the optical resin film is stretched in both directions simultaneously, the stretching ratio is the same, nx and ny are basically the same, but the in-plane anisotropy is not obvious. When the optical resin film is stretched successively in the X-axis and Y-axis directions, the refractive index in the second stretching direction increases with the strain rate, the refractive index in the first stretching direction decreases, and nz continues to decrease on the basis of the first uniaxial stretching.

[0118] Referring to Figure 10 , assume that the three directions of the optical resin film are the X-axis, Y-axis, and Z-axis, and that the film is stretched along the X-axis and Y-axis. The corresponding refractive indices along the three axes are nx, ny, and nz, and the average refractive index of the film is n = (nx + ny + nz) / 3. The degree of anisotropy after stretching is Δxy = nx - ny, and the film's in-plane orientation is Δ(xy)z = [(nx + ny) / 2] - nz.

[0119] When an optical resin film is stretched uniaxially along the X-axis, the in-plane anisotropy Δxy increases dramatically with strain rate, while the in-plane orientation Δ(xy)z is always smaller than the anisotropy Δxy. However, when the optical resin film is stretched simultaneously in the X- and Y-axis directions, or stretched sequentially in the X- and Y-axis directions, the in-plane orientation Δ(xy)z increases with strain rate and is significantly greater than the anisotropy Δxy. Furthermore, comparing simultaneous biaxial stretching with sequential biaxial stretching, sequential biaxial stretching is more conducive to forming anisotropy within the film.

[0120] Optionally, orientation refers to the parallel arrangement of molecular chains along the direction of the external force under the action of an external force. Unoriented materials are isotropic, that is, the performance is the same in all directions. The mechanical properties of the oriented material are enhanced in the orientation direction. Oriented materials are anisotropic, that is, the performance is different in different directions. The orientation of general materials includes uniaxial orientation and biaxial orientation. In the embodiment of the present application, uniaxial stretching can form a uniaxial orientation of the film, and biaxial simultaneous stretching or biaxial sequential stretching can form a biaxial orientation of the film.

[0121] When preparing the phase retardation film 33, the optical resin film selected can be a PET film or a PC film. Both PET and PC are semi-crystalline materials, with crystalline and amorphous regions, and the crystalline region has a compact structure. After orientation stretching, the crystallinity of the PC film will be greatly improved. In addition, when the film is stretched, the strength parallel to the stretching direction increases with the increase of the stretching ratio, but the strength perpendicular to the stretching direction decreases. Under certain temperature conditions, the greater the stretching ratio, the greater the degree of orientation of the molecular chain of the material, that is, the elongation at break of the film decreases, the impact strength and folding resistance increase, the mechanical strength increases, the modulus increases, and the air permeability and gloss performance are better.

[0122] Uniaxial stretching primarily increases the degree of anisotropy of the molecular chain orientation within the film plane (in-plane anisotropy), while biaxial stretching primarily increases the degree of orientation of the molecular chains within the film plane (in-plane orientation). In other words, biaxial stretching creates biaxial orientation, making the material anisotropic, with the molecular chains in a biaxially oriented state. The higher the degree of orientation, the higher the material performance. Therefore, in a specific implementation, a biaxial sequential stretching process can be used to prepare the phase retarder film 33, with the temperature set in the stretching range of 95-100°C (PET has a thermal deformation temperature of 85°C, and stretching is performed after softening).

[0123] Optionally, the optical resin film includes at least one of a PET film and a PC film. Since PET and PC films are light-transmitting and have good stretchability, when the optical resin film is a PET or PC film, it can be easily biaxially stretched to form a phase retarder film 33 having biaxially anisotropic refractive index characteristics.

[0124] In the embodiment of the present application, the optical axis of the phase retarder film 33 is in either of the two stretching directions. The two stretching directions are perpendicular to each other. In practical applications, when the optical axis of the phase retarder film 33 is parallel to the transmission axis of the first polarizing layer 31, the half-wave polarizing film can deflect the fifth light ray passing through the first polarizing layer 31 by 45°, and the phase retarder film 33 can phase retard the third light ray passing through the half-wave polarizing film.

[0125] In the embodiment of the present application, the phase retarder film 33 can be made of an optical resin film by biaxially sequentially stretching, where the refractive index in the two stretching directions is different. That is, the phase retarder film 33 has a refractive index in two directions, and the refractive index in the two directions is different. For example, the stretching direction of the optical resin film includes a first direction and a second direction. The refractive index of the phase retarder film 33 in the first direction and the second direction is different.

[0126] Optionally, the first direction and the second direction are both parallel to the planar direction of the optical resin film, and the first direction and the second direction are perpendicular to each other, so as to facilitate stretching the optical resin film along the planar direction of the optical resin film toward the first direction and the second direction to obtain a phase delay film 33 with different refractive indices in the first direction and the second direction.

[0127] For example, 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 a birefringence through processes such as polymerization, film formation, stretching, and surface processing. During the heating and stretching process, the temperature / stretching rate to which the molecules are subjected in the first direction and the second direction differs, and the molecular chains change, thereby changing the molecular orientation of the film. By changing the stretching method (unidirectional stretching, bidirectional stretching, successive stretching) and the stretching rate, the molecules in the material can be oriented, thereby preparing an anisotropic film.

[0128] Specifically, referring to Figure 11, the current process flow for forming the phase retarder film 33 includes the following steps: feeding raw material particles → storage → drying → melting → cooling and forming → stretching in the first direction (which may be referred to as longitudinal stretching) → stretching in the second direction (which may be referred to as transverse stretching) → heat fixing → unwinding → cutting (cutting is not shown in the figure). By differentiating stretching parameters such as the stretching temperature and stretching rate in the first and second directions, the molecular orientation of the optical resin film in the first and second directions can be changed, resulting in a directional distribution of the molecules in the optical resin film and exhibiting different refractive indices in the first and second directions.

[0129] As a second optional implementation, the second polarizing layer 32 is a linear polarizing layer. 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 the structure and function of the first polarizing layer 31. Optionally, the fifth light after passing through the first polarizing layer 31 can also pass through the second polarizing layer 32 to obtain a third light, and the polarization direction of the third light passing through the second polarizing layer 32 is the same as the polarization direction of the fifth light passing through the first polarizing layer 31. That is, the second polarizing layer 32 cannot angularly deflect the fifth light. Based on 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 embodiment of the present application can be an integral linear polarizing film.

[0130] Furthermore, in order for the phase retarder film 33 to convert the third light into circularly polarized light (or elliptically polarized light), the phase retarder film 33 itself must be configured to angularly deflect the linearly polarized light. Thus, the optical axis of the phase retarder film 33 and the transmission axis of the first polarizing layer 31 form a second angle, which can range from 35 degrees to 55 degrees. Thus, the phase retarder film 33 can angularly deflect the third light after it passes through the first and second polarizing layers 31, 32, within a range of 35 degrees to 55 degrees.

[0131] Referring to Figure 7 , the closer the second angle between the optical axis of the phase retarder film 33 and the transmission axis 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 (i.e., the closer it is to 0). Specifically, the smaller the absolute value of the difference between the second 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. Furthermore, the smaller the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light, the more circularly polarized light is converted, and the closer the display is to natural light.

[0132] Furthermore, referring to Figure 7 , the greater the difference between the second angle between the optical axis of the phase retarder film 33 and the transmission axis 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 (i.e., the closer it is to 1). In other words, the greater the absolute value of the difference between the second angle and 45°, the greater the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light. Furthermore, the greater the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light, the less circularly polarized light is converted.

[0133] From the above analysis, it can be seen that the closer the second angle between the optical axis of the phase retarder film 33 and the transmission axis of the first polarizing layer 31 is to 45°, the closer the display is to natural light. Therefore, the absolute value of the difference between the fixed polarization degree and the polarization degree of the second light is positively correlated with the absolute value of the difference between the second angle and 45°. In other words, the second angle is preferably 45°.

[0134] In the embodiment of the present application, the phase retarder film 33 has anisotropic characteristics (i.e., the phase retarder film has a refractive index in two directions, and the refractive index in the two directions is different). After natural light passes through the first polarizing layer 31 and the second polarizing layer 32, the third light passing through the second polarizing layer 32 can be phase delayed after passing through the phase retarder film 33. Optionally, the phase retarder film 33 can generate a phase delay of N times for the third light, where N is an odd number equal to 1 / 4 of the wavelength of the third light.

[0135] In addition, the phase retarder film 33 can be made of a polymer resin film such as PET, and a high phase retardation difference can be produced through a biaxial stretching process. When linearly polarized light is incident on the high phase retarder film 33, and the phase difference satisfies Δn*d = (2m+1)*λ / 4 (m=0, 1, 2, etc.), the linearly polarized light is phase-retarded by λ / 4, converting the incident linearly polarized light into circularly polarized light. The greater the phase difference Δn*d, the more circularly polarized light is converted in the visible light band (380nm to 780nm), and the display is closer to natural light.

[0136] Alternatively, the phase retarder film 33 may be made of an optical resin film, which is prepared by biaxially stretching the optical resin film. The principle of biaxially stretching can be found in the detailed description of the first embodiment above, and will not be further elaborated in this embodiment.

[0137] Among them, the difference between the preparation method in the second implementation and the preparation method in the first implementation is that the angle between the two stretching directions is 45°. That is, the stretching direction of the stretching process in the first implementation is changed from the initial longitudinal axis stretching → transverse axis stretching to longitudinal stretching → oblique stretching (refer to the third direction stretching in Figure 11). (The angle between the oblique stretching direction and the longitudinal stretching direction is 45°). In this way, the angle between the optical axis direction of the phase delay film 33 and the light transmission axis direction of the first polarizing layer 31 can be 45°. The optical axis of the coil of anisotropic phase delay film 33 prepared by this process is 45°. Its main process flow remains unchanged, and the difference lies in the change of stretching direction.

[0138] In the embodiment of the present application, the first polarizing layer 31, the second polarizing layer 32, and the phase retarder film 33 are obtained by laminating and cutting the rolls of the first polarizing layer 31, the second polarizing layer 32, and the phase retarder film 33. The rolls of the first polarizing layer 31, the second polarizing layer 32, and the phase retarder film 33 are laminated using any of the following three methods.

[0139] Method 1: The roll of the phase retarder film 33 and the roll of the second polarizing layer 32 are composited 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 retarder film 33 to obtain a composite roll.

[0140] Method 2: The roll of the second polarizing layer 32 and the roll of the first polarizing layer 31 are compositely 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 to obtain a composite roll.

[0141] Method three: Referring to Figures 12 and 13, the roll of the phase delay 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 delay 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 compositely bonded to obtain a composite roll.

[0142] In Methods 1 through 3 above, a protective film can be placed on the side of the phase retarder film 33 facing away from the second polarizing layer 32 to prevent damage. In Methods 1 and 2, two rolls are bonded first, followed by the third. In Method 3, all three rolls are bonded simultaneously. Therefore, Method 3 offers a more efficient bonding method.

[0143] Furthermore, as can be seen from the three lamination methods described above, the high phase retardation film, the second polarizing layer, and the first polarizing layer can all be prepared as rolls first. These three layers can then be laminated using a roll-to-roll process. Subsequently, for product application, the composite roll can be cut according to product requirements, improving material utilization while also meeting the requirements for large-scale product applications. Therefore, the relationship between the transmission axis of the first polarizing layer 31, the transmission axis of the second polarizing layer 32, and the optical axis of the phase retardation film 33 is related to the orientation of the three rolls.

[0144] In the second implementation, if the two stretching directions of the phase delay film 33 roll are perpendicular, the three rolls are directly bonded together and then cut. This cannot ensure that the optical axis direction of the phase delay 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.

[0145] That is, referring to Figure 14 , if the two stretching directions of the phase retarder film 33 roll are perpendicular, the roll of phase retarder film 33 must first be cut at a 45° angle to obtain a sheet of phase retarder film 33. The sheet of phase retarder film 33 is then laminated to the rolls of the first polarizing layer 31 and the second polarizing layer 32. This method results in material waste in the roll of phase retarder film 33.

[0146] Therefore, in the second implementation of the present application, by directly adjusting the angle between the stretching directions of the two stretching processes of the phase delay film 33 , not only the angle requirement can be met, but also the waste of the roll can be avoided.

[0147] In the embodiment of the present application, the second implementation method can also achieve the conversion of 24 wavelengths of light into circularly polarized light, so that the linear polarized light of multiple bands in the visible light band can be converted into circularly polarized light, achieving the effect of full-viewing angle and no color deviation display.

[0148] In other words, the phase retarder film 33 can angularly deflect and phase-retard the third light ray that passes through the first polarizing layer 31 and the second polarizing layer 32. Furthermore, the large phase difference between the first and third light rays converts linearly polarized light in multiple wavelengths within the visible light band into circularly polarized light, achieving a display with zero color shift across all viewing angles. Furthermore, the polarizing assembly 30 in this embodiment of the present application avoids the need for an additional liquid crystal layer or cellulose acetate polymer film, resulting in a simple structure and ease of implementation.

[0149] 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. For example, the linear polarizing layer 312 in Figure 6 can 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 shared film layers of the first polarizing layer 31 and the second polarizing layer 32. Optionally, the phase retarder film 33, the first polarizing layer 31, and the second polarizing layer 32 can be a composite structure. Referring to Figure 15, the phase retarder film 33 can directly replace the second substrate layer 313. Alternatively, the phase retarder film 33, the first polarizing layer 31, and the second polarizing layer 32 can be externally laminated. Referring to Figure 16, the phase retarder film 33 is laminated to the side of the second substrate layer 313 away from the first substrate layer 311.

[0150] In the embodiment of the present application, the polarization degree of white light can be used as an evaluation benchmark 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 polarization degree of the fourth light satisfies: Polarization degree of the fourth light = (Lmax-Lmin) / (Lmax+Lmin) Formula (7)

[0151] In the above formula (7), Lmax is the maximum brightness value of the fourth light, and Lmin is the minimum brightness value of the fourth light. The polarization degree of white light is determined by detecting the maximum brightness value and the minimum brightness value. Referring to FIG17 , the polarization degree detection device may include a detector 01, an analyzer 02, a display screen 03, and a backlight source 04. The display screen 03 refers to a display screen 03 with a polarizing component capable of transmitting circularly polarized light (when testing samples with different polarizing components, the display screen 03 with different polarizing components is replaced). The analyzer 02 here uses a linear polarizer. During the test, the display screen 03 to be tested is placed on the backlight source 04 and lit, and the analyzer 02 is rotated in the plane of 0 to 360 degrees to test the brightness of the analyzer 02 at different rotation angles, where the maximum brightness is Lmax and the minimum brightness is Lmin. The principle is that the light emitted by the backlight source 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. A linearly polarized light analyzer 02 is placed on display screen 03. The brightness after passing through analyzer 02 is measured by rotating analyzer 02. If the light passing through display screen 03 is linearly polarized, a distinct change from bright to dark will occur. Specifically, when the transmission axis of analyzer 02 is parallel to the optical axis of the upper polarizer assembly of display screen 03, all light is transmitted, resulting in the highest brightness. When the transmission axis of analyzer 02 is perpendicular to the optical axis of the upper polarizer assembly of display screen 03, no light is transmitted, resulting in the lowest brightness. Similarly, if the brightness measured at each rotation angle of analyzer 02 is the same, the conversion of linearly polarized light into circularly polarized light is most effective. Specifically, a degree of polarization of 0 indicates circular polarization; a degree of polarization of 1 indicates linear polarization; and a degree of polarization between 0 and 1 indicates elliptically polarized light. The closer the value is to 1, the more circularly polarized the polarized light. This method can effectively calculate and determine the conversion efficiency of light's polarization state.

[0152] In the embodiment of the present application, in the range of the wavelength of light of 380nm to 780nm, the difference in the refractive index of the phase delay film 33 in the two directions is greater than 0.1. The thickness of the phase delay film 33 can range from 45μm to 125μm, and the phase delay amount of the first light and the third light can be greater than 8μm. 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 a refractive index in two directions, and the refractive index in the two directions is different), the difference in the refractive index in the two directions of the half-wave polarizing film 32 can be half of the difference in the refractive index in the two directions of the phase delay film 33, such as the difference in the refractive index in the two directions of the half-wave polarizing film 32 is greater than 0.05.

[0153] Table 2

[0154] As shown in Table 2, when the strain rate is 35, the difference between the refractive index of the phase delay film 33 in the first direction and the refractive index in the second direction can reach 0.105. When the thickness of the phase delay film 33 is 80 μm, the phase delay amount (phase difference) △n*d of the phase delay film 33 can meet the following conditions: △n*d=80*1000*0.105=8400nm=8.4μm.

[0155] Assuming that the first angle between the optical axis of the half-wave polarizing film 32 and the transmission axis of the first polarizing layer 31 is 22.5°, then according to formula (4) λ = Δn*d*4 / (2m+1), and m is 0, 1, 2, etc., it can be calculated that among all wavelengths, there are 24 wavelengths in the visible light band (the wavelength of light is in the range of 380nm to 780nm). In other words, the phase retarder film 33 can convert 24 wavelengths of light into circularly polarized light, thereby converting linearly polarized light in multiple bands of the visible light band into circularly polarized light, achieving the effect of displaying without color shift at all viewing angles.

[0156] In the first implementation of the present application, the fifth light ray after passing through the first polarizing layer 31 is deflected at an angle by the half-wave polarizing film 32, and the third light ray after passing through the half-wave polarizing film remains linearly polarized light. The phase delay film 33 can directly phase-delay the third light ray after passing through the half-wave polarizing film. In addition, the phase difference between the first light ray and the third light ray is large, so the linearly polarized light of multiple bands within the visible light band can be converted into circularly polarized light, achieving a full-viewing angle and color-free display. In addition, the polarizing component 10 in the embodiment of the present application also avoids the operation of adding an additional liquid crystal layer or cellulose acetate polymer film, and has a simple structure and is easy to implement.

[0157] As can be seen from Table 2 above, the polarization degree of the fourth light (white light) of the solution of the present application is 3.4%, which is less than 5%, and is difficult for the human eye to detect. However, the polarization degree of white light in both Architecture 1 and Architecture 2 is relatively large and is easily recognized by the human eye. Moreover, in the solution of the present application, within the wavelength range of 380nm to 780nm, the full-view color deviation ΔEab of the light passing vertically through the polarizing component is less than 5JND (minimum noticeable difference). 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 current color deviation evaluation standard in the display field.

[0158] Comparison of experimental verification results:

[0159] For example, a 55-inch and a 32-inch display screen 03 were used as platforms to build two display samples for technical verification. Architecture 1 is a display screen 03 with a polarizing component coated with a liquid crystal. The solution of this application is a display screen 03 with a polarizing component composed of a biaxially sequentially stretched optical resin film.

[0160] Specifically, under white (W), red (R), green (G), and blue (B) images, the changes in brightness and color coordinates were tested after rotating the analyzer 02. Table 3 shows the polarization performance of the first implementation of the embodiment of the present application, Table 4 shows the polarization performance of the second implementation of the embodiment of the present application, and Table 5 shows the polarization performance of architecture 1.

[0161] It can be seen from Tables 3 to 5 that the polarization degrees of the two implementation methods of the present application are smaller than that of Architecture 1, indicating that the depolarization effect of the present application scheme is the best, and more linearly polarized light can be converted into circularly polarized light. The brightness changes at different angles viewed through the analyzer 02 are small.

[0162] Table 3

[0163] Table 4

[0164] Table 5

[0165] Referring to Figures 18 to 21, it can be seen that no matter it is a white (W) screen, a red (R) screen, a green (G) screen or a blue (B) screen, as the analysis angle changes, the degree of brightness change of the two schemes in the embodiments of the present application is smaller than the degree of brightness change of architecture one, indicating that the two schemes in the embodiments of the present application have better brightness uniformity than architecture one.

[0166] Referring to Figures 22 to 29, it can be seen that no matter it is a white screen, a red screen, a green screen or a blue screen, as the detection angle changes, the degree of change of the color coordinates (x and y) of the two schemes in the embodiments of the present application is smaller than the degree of change of the color coordinates of Architecture 1, indicating that the two schemes in the embodiments of the present application have smaller color deviation than Architecture 1 and are not visible by visual observation.

[0167] In practical applications, a lower degree of polarization indicates a lower proportion of linearly polarized light and a higher proportion of circularly polarized light. The ideal value is a degree of polarization of 0, representing a zero proportion of linearly polarized light, but this is difficult to achieve in practice. Based on actual product performance, for the polarizing components of the present embodiment, the degree of polarization of the fourth light (white light) can be less than 5%, as shown in Table 3, where the degree of polarization is 1.46%, and in Table 4, where the degree of polarization is 3.19%.

[0168] Furthermore, when analyzing the polarization of Architecture 1, the display effect diagram shown in Figure 30 is obtained. As can be seen from Figure 30, the brightness exhibits a 180° periodic variation, gradually decreasing to minimum brightness when analyzing from 0° to 90°, and gradually increasing from minimum brightness to maximum brightness when analyzing from 90° to 180°. The chromaticity exhibits a 180° periodic variation, with the color temperature gradually increasing from warm (yellowish) to cool (bluish) when analyzing from 0° to 90°, and gradually decreasing from high to low color temperature when analyzing from 90° to 180°.

[0169] When analyzing the polarization of the present invention, the display effect diagram shown in Figure 31 is obtained. As can be seen from Figure 31, the brightness is displayed as follows: rotating the polarizer 02 from 0° to 180°, the brightness does not change significantly. The chromaticity is displayed as follows: rotating the polarizer 02 from 0° to 180°, the chromaticity does not change significantly.

[0170] Table 6

[0171] Furthermore, the second angle γ between the optical axis direction of the phase retardation film 33 and the transmission axis direction of the first polarizing layer 31 in the second implementation is set to 45°, 40°, 35°, 30°, 25° and 20°, resulting in the above Table 6 and Figure 32.

[0172] In Table 6 above, ΔL is used to indicate brightness changes. Wxy is used to indicate 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 indicate 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 indicate 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 indicate 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.

[0173] As can be seen from Table 6 and Figure 32, at different second angles γ and analyzer angles, there is no difference in color shift, only in brightness. Brightness is highest at an analyzer angle of 45°, and lowest at an analyzer angle of 135°. The analyzer angle refers to the angle between the polarization direction of the analyzer 02 and the transmission axis of the first polarizing layer.

[0174] Furthermore, as the second angle γ gradually changes from 45° to 20° (45°→20°), the difference in brightness at different analyzer angles increases as the second angle γ decreases. In other words, when the second angle γ is 45°, the difference in brightness at different analyzer angles is minimal, and when the second angle γ is 20°, the difference in brightness at different analyzer angles is maximum.

[0175] The display of this application solution shows a noticeably darker image when the second angle γ is less than or equal to 30° (γ≤30°) and the analyzer angle is 135°. The display of Architecture 1 shows significant chromaticity differences at different analyzer angles, with a noticeable yellowish tint at 0° and 180° and a noticeable bluish tint at 90°.

[0176] It should be noted that for linearly polarized light liquid crystal display products, liquid crystal display products corresponding to architecture 1, and liquid crystal display products corresponding to the present application solution, the advantages of the present application are specifically analyzed as follows:

[0177] Traditional polarizers and sunglasses are both linear polarizers. Their brightness is highest when their transmission axes are parallel, and zero when their transmission axes are perpendicular, creating a blackout state where the image is invisible. Because of this blackout state, they are not suitable for sunglasses-free displays.

[0178] Architecture 1 (1 / 4 wave plate): When the backlight source serves as incident light and passes through sunglasses with different transmission axes, the white point coordinates drift. The main reason is that due to the influence of the 1 / 4 wave plate, only light of a specific wavelength can be converted into circularly polarized light, and light of other bands is converted into elliptically polarized light. After the RGB monochromatic light passes through the polarizing component formed by the 1 / 4 wave plate, the transmittance ratio of RGB changes, and the transmittance ratio B>G>R, that is, the polarizing component formed by the 1 / 4 wave plate has a high optical rotation efficiency for short-wave blue light (similar to circular polarization). As the wavelength increases, the optical rotation efficiency decreases and the elliptical polarization increases. The 1 / 4 wave plate has different optical rotation efficiencies for monochromatic light, and there is a serious color cast, so the visual display effect of the sunglasses is limited.

[0179] The difference between this application scheme and Architecture 1 is that the polymer material has a large phase delay after bidirectional successive stretching, which can convert multiple wavelengths of light in the first line into circularly polarized light. After passing through sunglasses with different transmittance axes, the RGB ratio changes slightly and the white point coordinates almost do not change, that is, there is no color cast problem, which is suitable for visual display in sunglasses and also achieves the function of preventing eye fatigue.

[0180] Figure 7 also shows that when α is 45°, the polarization degree of the first light exhibits periodic fluctuations (i.e., the first light fluctuates with a fixed period around a fixed polarization degree). Furthermore, as the wavelength of the first light increases, the peak value of the polarization fluctuation 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) gradually increases. There is no difference in brightness or color shift at different analyzer angles.

[0181] When α is not 45°, the polarization degree of the first light also varies periodically. As the wavelength of the first light increases, the fluctuation in the polarization degree of the first light decreases significantly. As α decreases from 45° to 20°, the difference between the fixed polarization degree of the first light and the polarization degree of the second light gradually increases, and the polarization gradually shifts towards linear polarization. Therefore, if α is not 45°, the image will have different brightness and darkness but no color shift at different analyzer angles. Furthermore, as α decreases from 45° to 20°, the difference in brightness and darkness gradually increases.

[0182] For Structure 1 (quarter-wave plate), the polarization degree of light fluctuates periodically as it moves within the visible light band. However, the light does not oscillate periodically around a fixed polarization degree, but rather with a fixed slope. Circularly polarized light appears as a single wavelength, while light of other wavelengths is converted to elliptically polarized light. As the wavelength increases, the elliptical polarization becomes stronger until it converts to linearly polarized light.

[0183] In summary, the polarizing assembly includes a first polarizing layer, a second polarizing layer, and a phase retarder film. The first polarizing layer is used to transmit light with a polarization direction along the transmission axis, and the phase retarder film is used to generate a phase retardation of an odd multiple of 1 / 4 of the wavelength of the light after passing through the first and second polarizing layers. Because a large amount of light has a polarization degree of 0 after passing through the phase retarder film, or because the polarization degree of light at different wavelengths after passing through the phase retarder film is relatively small, the brightness difference and color shift are relatively small when the user views the display from different viewing angles, facilitating a display effect close to natural light.

[0184] FIG33 is a flow chart of a method for preparing a polarizing assembly according to an embodiment of the present application. Referring to FIG33 , the method includes:

[0185] Step S101: using an optical resin film to form a phase retardation film roll.

[0186] In the embodiment of the present application, the optical resin film can be stretched to form a phase retarder film roll, so that the phase retarder film roll has anisotropic characteristics. Optionally, the optical resin film can include but is not limited to any one of PET film and PC film.

[0187] Optionally, a biaxial sequential stretching process is employed to stretch the optical resin film into a phase retarder film roll. Specifically, during the heat-stretching process, the optical resin film can be first stretched in a first direction and then stretched in a second direction. By varying stretching parameters such as the stretching temperature and stretching rate in the first and second directions, the molecular orientation of the optical resin film in the first and second directions can be altered, resulting in a directional distribution of molecules within the optical resin film and exhibiting different refractive indices in the first and second directions.

[0188] In the embodiment of the present application, the step of forming a roll of the phase retardation film 33 using an optical resin film may include the following sub-steps:

[0189] Sub-step S1011: stretching the optical resin film along a first direction.

[0190] In the embodiment of the present application, the first direction is parallel to the planar direction of the optical resin film, so that the optical resin film can be stretched along the planar direction of the optical resin film toward the first direction.

[0191] For example, the first direction may be a conveying direction of the optical resin film.

[0192] Sub-step S1012: stretching the optical resin film along the second direction to obtain a roll of phase retardation film.

[0193] In the embodiment of the present application, the second direction is parallel to the planar direction of the optical resin film, so that the optical resin film is stretched along the planar direction of the optical resin film toward the second direction.

[0194] If the second polarizing layer is a half-wave polarizing film (see the first implementation of the above embodiment), the second direction is perpendicular to the first direction. In other words, the second direction is perpendicular to the transmission direction of the optical resin film. If the second polarizing layer is a linear polarizing layer (see the second implementation of the above embodiment), the angle between the second direction and the first direction ranges from 35° to 55°, for example, 45°. In other words, the angle between the second direction and the transmission direction of the optical resin film ranges from 35° to 55°.

[0195] In some optional embodiments of the present application, after the optical resin film is stretched into a phase retarder film roll using the biaxial sequential stretching process, the phase retarder film roll may be subjected to a surface hardening treatment to increase the surface hardness of the phase retarder film roll, thereby making the phase retarder film roll scratch-resistant. Furthermore, the phase retarder film roll may be subjected to an anti-glare treatment to achieve an anti-glare display effect.

[0196] Step S102 : placing the first polarizing layer roll, the second polarizing layer roll, and the phase retardation film roll in sequence and bonding them together to obtain a composite roll.

[0197] In the embodiment of the present application, the roll of the first polarizing layer, the roll of the second polarizing layer, and the roll of the phase retardation film can be fed separately as rolls, and the two adjacent layers are bonded and connected to obtain a composite roll.

[0198] In the embodiment of the present application, if the roll of the second polarizing layer is a roll of half-wave polarizing film, the first angle between the optical axis of the roll of the half-wave polarizing film and the transmission axis of the roll of the first polarizing layer can be set to 22.5°. If the roll of the second polarizing layer is a roll of linear polarizing layer, the second angle between the optical axis of the roll of the phase retarder film and the transmission axis of the roll of the first polarizing layer can be set to 45°.

[0199] In the embodiment of the present application, the first transparent protective layer roll, the linear polarizing layer roll and the substrate layer roll are compositely bonded to obtain the composite roll in any one of the following three ways.

[0200] Method 1: The roll of the phase retarder film 33 and the roll of the second polarizing layer 32 are composited 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 retarder film 33 to obtain a composite roll.

[0201] Method 2: The roll of the second polarizing layer 32 and the roll of the first polarizing layer 31 are compositely 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 to obtain a composite roll.

[0202] Method three: The roll of the phase delay 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 delay 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 compositely bonded to obtain a composite roll.

[0203] The solution of this application does not require cutting the phase retardation film roll at a 45° angle to obtain the phase retardation film 33 sheet. Instead, the high phase retardation film, the second polarizing layer, and the first polarizing layer are first prepared into a roll. The three layers of film can be laminated in a roll-to-roll manner. Later, in order to apply it to the product, the composite roll can be cut according to product requirements, which can improve material utilization and meet the application of large-scale products. Therefore, 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 direction of the three rolls.

[0204] Step S103: cutting the composite coil to obtain polarizing components.

[0205] In the embodiment of the present application, the composite coil can be cut according to the actual product needs. Moreover, the composite coil can be cut along the width direction without the need for diagonal cutting, which can avoid the waste of the coil.

[0206] In the embodiment of the present application, the first polarizing layer 31 has a transmission axis and is configured to transmit linearly polarized light whose polarization direction is along the transmission axis. The second polarizing layer 32 is located on one side of the first polarizing layer 31. The phase retarder film 33 is located on the side of the second polarizing layer 32 away from the first polarizing layer 31.

[0207] Among them, the third light after passing through the first polarizing layer 31 and the second polarizing layer 32 is still linearly polarized light. The phase delay film 33 can convert the third light after passing through the first polarizing layer 31 and the second polarizing layer 32 into circularly polarized light or elliptically polarized light, so as to achieve a display effect close to natural light.

[0208] It should be noted that the degree of polarization (DOP) of light is used to measure the degree of polarization of the light. The absolute value of the DOP ranges from 0 to 1. An absolute value of 0 indicates circular polarization of the light; an absolute value greater than 0 and less than 1 indicates elliptically polarized light; and an absolute value of 1 indicates linear polarization. To achieve a display effect close to natural light, the DOP of the light passing through the phase retarder film 33 must be as close to or as close to zero as possible.

[0209] In the embodiment of the present application, the phase retarder film is used to cause a first light ray to fluctuate with a fixed period around a fixed polarization axis. The first light ray, after passing through the phase retarder film, has a wavelength in the range of 380 nm to 780 nm (visible light band). The fixed period is greater than or equal to 20.

[0210] The first light includes a second light with zero polarization degree, and the absolute value of the difference between two adjacent wavelengths in the second light is positively correlated with the wavelength of the second light. That is, the greater the wavelength of the second light, the greater the absolute value of the difference between two adjacent wavelengths in the second light; and the smaller the wavelength of the second light, the smaller the absolute value of the difference between two adjacent wavelengths in the second light.

[0211] Optionally, the number of second light rays with zero polarization is positively correlated with the fixed period. A larger fixed period increases the number of second light rays with zero polarization, and a smaller fixed period decreases the number of second light rays with zero polarization. Since the fixed period is greater than or equal to 20, the number of second light rays with zero polarization can be increased. This means that the polarizing assembly can depolarize light at multiple wavelengths within the visible light band and convert it into circularly polarized light, facilitating a near-natural light display effect. Brightness differences and color shift are minimized when viewed from different viewing angles.

[0212] Alternatively, the polarization degree of the first light of any wavelength is less than 0.5. In other words, the polarization degree of the first light of any wavelength is relatively small, making the first light close to circularly polarized light, facilitating a display effect close to natural light, with minimal brightness differences and color shift when viewed from different viewing angles.

[0213] In summary, the embodiments of the present application provide a method for preparing a polarizing assembly, which includes a first polarizing layer, a second polarizing layer, and a phase retarder film. The first polarizing layer is used to transmit light with a polarization direction in the direction of the transmission axis. Since a large number of second light rays with zero polarization degree after passing through the phase retarder film are generated, or the polarization degree of first light rays of any wavelength after passing through the phase retarder film is relatively small, the brightness difference and color shift are minimized when viewed from different viewing angles, facilitating a display effect close to natural light.

[0214] FIG34 is a schematic diagram of the structure of a display device provided in an embodiment of the present application. Referring to FIG34 , it can be seen that the display device includes: a display panel 40 and the polarizing assembly 30 described in the above embodiment, and the polarizing assembly 30 is located on the light-emitting side of the display panel 40.

[0215] Optionally, referring to FIG34 , the display device further includes a backlight source 50 and a third polarizing layer 60. The backlight source 50 is located on a side of the display panel 40 away from the polarizing assembly 30, and is configured 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, and the transmission axis of the first polarizing layer 60 is perpendicular to the transmission axis of the first polarizing layer 31 in the polarizing assembly 30.

[0216] Referring to Figure 35 , taking the example of a half-wave polarizing film as the second polarizing layer 32 in the polarizing assembly 30, the light emitted by the backlight source 50 can be roughly considered natural light. After passing through the third polarizing layer 60, the light emitted by the backlight source 50 is converted into linearly polarized light, with the polarization direction of the linearly polarized light being the direction of the transmission axis of the third polarizing layer 60. After passing through the liquid crystal in the display panel 40, this linearly polarized light is converted into elliptically polarized light. The light in this elliptically polarized light that is parallel to the transmission axis of the first polarizing layer 31 passes through the first polarizing layer 31. That is, the light after passing through the first polarizing layer 31 is linearly polarized light (fifth light), and the polarization direction of the fifth light is the direction of the transmission axis of the first polarizing layer 31. Subsequently, the fifth light remains linearly polarized light (third light) after passing through the half-wave polarizing film 32, but its polarization direction is rotated 45°. Finally, the third light is modulated into circularly polarized light or elliptically polarized light (second light) by the phase retarder film 33.

[0217] In Figure 35, a small dot and a small horizontal bar at the location 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 used to indicate that the polarization direction of the linear polarized light is perpendicular to the transmission axis direction of the first polarizing layer 31. A small dot and two small horizontal bars on the upper side of the liquid crystal in the display panel 40, as well as a small dot and two small horizontal bars on the upper side of the display panel 40 are used to represent elliptically polarized light. The two small horizontal bars on the upper side of the first polarizing layer 31 are used to indicate that the polarization direction of the linear polarized light is the transmission axis direction of the first polarizing layer 31, and the two oblique bars on the upper side of the half-wave polarizing film 32 are used to indicate that the polarization direction of the linear polarized light is at a certain angle (for example, 45°) to the transmission axis direction of the first polarizing layer 31. The circular arrow on the upper side of the phase delay film 33 is used to represent circularly polarized light or elliptically polarized light.

[0218] Since the display device can have substantially the same technical effects as the polarizing assembly described in the previous embodiment, the technical effects of the display device will not be repeatedly described here for the purpose of brevity.

[0219] The terms used in the embodiments 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 embodiments of this application should have the common meaning understood by people with ordinary skills in the field to which this application belongs.

[0220] The terms used in the embodiments of this application are intended solely to illustrate the embodiments of this application and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in the embodiments of this application should have the same ordinary meaning as those understood by persons of ordinary skill in the art to which this application belongs. The terms "first," "second," "third," and similar terms used in this patent specification and claims do not denote any order, quantity, or importance, but are simply used to distinguish between different components. Similarly, terms such as "a" or "an" do not denote a limitation of quantity, but rather denote the presence of at least one. Terms such as "include" or "comprising" and similar terms mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising," and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used solely to indicate relative positions. When the absolute position of the described objects changes, the relative positions may also change accordingly.

[0221] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A polarizing 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 any wavelength of the first light ray is less than 0.

5.

2. The polarizing 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, 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, 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, characterized in that 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, 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.

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.

Images