Polarizer and display device

Abstract

The invention relates to a polaroid and a display device, the polaroid comprises a polarizing layer and a light conversion layer, first phosphors are dispersed in the light conversion layer, and the first phosphors emit light at least in the wave band of 470 nanometers to 530 nanometers. According to the embodiment of the invention, the first fluorophor which emits light at least in the wave band of 470-530 nanometers is added into the film layer of the polaroid, so that the light emitting spectrum of light emitted from the polaroid is smoother and more continuous and the emitted light is closer to natural light without changing a backlight LED light source, the eye protection effect is achieved, and the service life of the backlight LED is prolonged. And the development of a four-color or even multi-color high-color gamut display device is facilitated.

Description

Technical Field

[0001] This application relates to the field of display technologies, and in particular, to a polarizer and a display device. Background Art

[0002] Currently, a light emitting diode (LED) white light source is formed by combining a blue LED with other phosphors. The phosphor converts a part of the radiation light of the blue LED into yellow, green, red light, etc. with long wavelengths, and these converted lights with long wavelengths are mixed with the radiation blue light of the LED to emit white light. The emission spectrum of a common LED white light source is as Figure 1 shown, where the abscissa is the wavelength and the ordinate is the emission intensity. As can be seen from Figure 1 this, in the emission spectra of these white light sources, the spectral intensity in some regions is poor, such as the blue-green light region, etc., resulting in poor color reproducibility of the illuminated object, and a relatively high proportion of blue light at 450 nanometers, which is harmful to the human eye and can cause visual fatigue. Based on the above viewpoints, currently, when some LED light emitting devices are encapsulated, phosphors are added to increase the light intensity in the corresponding regions.

[0003] However, adding too many phosphors in an LED light emitting device is very likely to cause problems such as an increase in the volume of the LED lamp, deterioration due to the interaction of phosphors, and a reduction in the lifespan of the phosphors due to heat, affecting the light efficiency. Summary of the Invention

[0004] Embodiments of this application provide a polarizer and a display device to at least partially solve the above technical problems.

[0005] To achieve the above object, according to the first aspect of this application, a polarizer is provided, including:

[0006] a polarization layer; and

[0007] a light conversion layer disposed on the first side of the polarization layer;

[0008] wherein, a first phosphor is dispersed in the light conversion layer, and the first phosphor emits light at least in the wavelength band of 470 nanometers to 530 nanometers.

[0009] In some embodiments of this application, the polarizer further includes:

[0010] a first substrate disposed on the first side of the polarization layer;

[0011] wherein, the light conversion layer is multiplexed as the first substrate.

[0012] In some embodiments of this application, the polarizer further includes:

[0013] A first substrate, disposed on the first side of the polarizing layer;

[0014] A first adhesive layer, disposed between the first substrate and the polarizing layer; and;

[0015] A second substrate, disposed between the first adhesive layer and the polarizing layer;

[0016] Wherein, the light conversion layer is multiplexed as at least one of the first substrate, the first adhesive layer, and the second substrate.

[0017] In some embodiments of the present application, the polarizing plate further includes a second phosphor, the second phosphor emits light at least in the wavelength band of 570 nanometers to 620 nanometers, and the second phosphor is dispersed in at least one of the first substrate, the first adhesive layer, and the second substrate.

[0018] In some embodiments of the present application, the polarizing plate further includes a third phosphor, the third phosphor emits light at least in the wavelength band of 690 nanometers to 800 nanometers, and the second phosphor is dispersed in at least one of the first substrate, the first adhesive layer, and the second substrate.

[0019] In some embodiments of the present application, the first substrate and the second substrate include at least one of cellulose triacetate, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polycycloolefin, polyethylene naphthalate; and / or

[0020] The first adhesive layer includes an acrylate resin.

[0021] In some embodiments of the present application, the thickness of the light conversion layer is 10 to 200 microns.

[0022] In some embodiments of the present application, the mass fraction of the first phosphor in the light conversion layer is 1% to 10%.

[0023] In some embodiments of the present application, the first phosphor includes at least one of an organoboron-nitrogen coordination compound and a rare earth inorganic compound.

[0024] In some embodiments of the present application, the organoboron-nitrogen coordination compound includes at least one of the compounds represented by the following structural formula:

[0025]

[0026] The rare earth inorganic compound includes (Ca,Sr,Ba)4Al 14 O 25 :Eu 2+and (Ca, Sr, Ba)8MgSi4O 16 (F, Cl, Br)2:Eu 2+ at least one of

[0027] According to a second aspect of the present application, there is provided a display device, including the polarizer, backlight, and display panel described in any of the above embodiments. The polarizer is located between the backlight and the display panel, and the light conversion layer is located on the side of the polarizer layer closer to the backlight.

[0028] Technical effect: In the polarizer and display device provided in the present application, by adding a first phosphor that emits light at least in the wavelength range of 470 nm to 530 nm to the film layer of the polarizer, the emission spectrum of the light emitted from the polarizer can be made more flat and continuous without changing the backlight LED light source, the emitted light is closer to natural light, achieving an eye protection effect, and is conducive to the development of four-color or even multi-color high-color gamut display devices.

[0029] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] In order to more fully understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0032] Figure 1 is an emission spectrum diagram of an exemplary white light source;

[0033] Figure 2 is a first schematic structural diagram of the polarizer provided in the embodiment of the present application;

[0034] Figure 3 is a second schematic structural diagram of the polarizer provided in the embodiment of the present application;

[0035] Figure 4 is the absorption spectrum and fluorescence spectrum of the organic boron-nitrogen coordination compound 1 provided in the embodiment of the present application;

[0036] Figure 5 is the emission spectrum diagram of the polarizers of the experimental example and the control example provided in the embodiment of the application under backlight illumination;

[0037] Figure 6 It is the emission spectrum diagram of the display device of the experimental examples and control examples provided by the application embodiments.

[0038] Description of reference numerals:

[0039] 10, polarizer; 10A, light conversion layer; 11, protective film; 12, first substrate; 13, first adhesive layer; 14, second substrate; 15, polarizing layer; 16, compensation film; 17, second adhesive layer; 18, release film. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0041] Please refer to Figure 2 , the embodiments of the present application provide a polarizer 10, which includes a polarizing layer 15 and a light conversion layer 10A. The light conversion layer 10A is disposed on the first side of the polarizing layer. A first phosphor is dispersed in the light conversion layer 10A, and the first phosphor emits light at least in the wavelength band of 470 nanometers to 530 nanometers.

[0042] The polarizing layer 15 includes an incident light side and an outgoing light side that are opposite to each other. The first side may be the incident light side of the polarizing layer 15 or the outgoing light side of the polarizing layer 15. It can be understood that the incident light side is the side where the light source is incident, and the outgoing light side refers to the side where the light exits from the polarizing layer 15. In the embodiments of the present application, taking the light conversion layer 10A being disposed on the incident light side of the polarizing layer 15 as an example for description.

[0043] By adding a first phosphor that emits light at least in the wavelength band of 470 nanometers to 530 nanometers to the film layer of the polarizer 10 in the embodiments of the present application, the emission spectrum of the light exiting from the polarizer 10 can be made more flat and continuous without changing the backlight LED light source, the light exiting is closer to natural light, achieving an eye protection effect, and being beneficial to the development of four-color or even multi-color high-color gamut display devices.

[0044] In some embodiments, the first phosphor may absorb light in the wavelength range of at least 400 nm to 460 nm. Specifically, the first phosphor may absorb light in the wavelength range of 400 nm to 420 nm, or may absorb light in the wavelength range of 440 nm to 460 nm, that is, the first phosphor may absorb blue light. Thus, the polarizing film 10 provided by the embodiments of the present application can absorb a part of the radiation light of the blue LED and convert it into cyan light, and the converted cyan light is mixed with the blue light radiated by the LED light source to emit white light, thereby realizing a full spectrum.

[0045] In some embodiments, the first phosphor may include at least one of an organoboron-nitrogen coordination compound and a rare earth inorganic compound.

[0046] In a specific embodiment, the organoboron-nitrogen coordination compound includes at least one of the compounds represented by the following structural formulas:

[0047]

[0048] The synthesis of the above organoboron-nitrogen coordination compound can be carried out with reference to the following prior art, and the embodiments of the present application will not be elaborated. "Hong Cheng, Design, Synthesis and Photophysical Properties of Luminescent Materials Based on BODIPY and B-N Coordination Chelates, South China University of Technology"; "Nonastarazine A Versatile Scaffold for Fluorescence Functional Materials, Honglin Qiu, Yi Feng, Jingtao Hu, Jiadong Zhou, Linlin Liu, and Zengqi Xie".

[0049] In a specific embodiment, the rare earth inorganic compound includes (Ca, Sr, Ba)4Al 14 O 25 :Eu 2+ (Ca, Sr, Ba)8MgSi4O 16 (F, Cl, Br)2:Eu 2+ and at least one of them.

[0050] In some embodiments, the polarizing layer 15 may be a polyvinyl alcohol (PVA) film layer, which has good film-forming property, flexibility and optical properties. The polarizing layer 15 allows light vibrating in a specific direction (the direction of the transmission axis) to pass through, while light vibrating in other directions is absorbed or blocked, thereby converting natural light into polarized light.

[0051] In some embodiments, the polarizer 10 includes a first substrate 12 disposed on the light incident side of the polarizing layer 15. Among them, the light conversion layer 10A is multiplexed as the first substrate 12. That is, the above-mentioned first phosphor is added to the first substrate 12 so that the first phosphor is dispersed in the first substrate 12. In this way, the separate setting of the light conversion layer 10A can be avoided, and without increasing the film material and without changing the structure of the LED light source, the light emitted by the polarizer 10 can be made more flat and continuous, approaching natural light, achieving an eye protection effect.

[0052] Specifically, please refer to Figure 2 , the polarizer 10 includes a protective film 11, a first substrate, a polarizing layer 15, a compensation film 16, a second adhesive layer 17, and a release film 18 stacked in sequence.

[0053] The protective film 11 is used to protect the film layers below it. The protective film 11 can be a transparent resin film formed by a thermoplastic resin such as a chain polyolefin resin (such as a polypropylene resin), a cyclic polyolefin resin (such as a norbornene resin), etc., a polyolefin resin, a cellulose ester resin such as cellulose triacetate and cellulose diacetate, a polyester resin such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, a polycarbonate resin, a (meth)acrylic resin, or a mixture or copolymer thereof.

[0054] In some embodiments, the first substrate 12 includes but is not limited to at least one of cellulose triacetate, polyethylene terephthalate (PET), polycarbonate, polymethyl methacrylate (PMMA), polycycloolefin, and polyethylene naphthalate.

[0055] In some embodiments, the compensation film 16 can be a compensation layer or a retardation film obtained by coating a liquid crystalline compound on the surface of a substrate and orienting and fixing it.

[0056] In some embodiments, the second adhesive layer 17 can be a pressure-sensitive adhesive (PSA) layer.

[0057] The function of the release film 18 is to protect the pressure-sensitive adhesive layer from damage and avoid the generation of bonding bubbles before the polarizer 10 is bonded to the display panel. The release film 18 can be a polyester film, such as a polyethylene terephthalate film, a polyolefin film such as a polyethylene film and a polypropylene film, or a polytetrafluoroethylene film, or a film treated with a release agent such as a siloxane resin, a melamine resin, or a urea resin, so that the release film 18 is easily peeled off.

[0058] In some embodiments, as Figure 3 shown, a first adhesive layer 13 and a second substrate 14 are further provided on the light incident side of the polarizing layer 15. Other structures are the same as Figure 2is the same as the embodiments shown, and other structures can be referred to Figure 2 the embodiments shown and will not be elaborated here.

[0059] Specifically, the first adhesive layer 13 is disposed between the first substrate 12 and the polarizing layer 15, and the second substrate 14 is disposed between the first adhesive layer 13 and the polarizing layer 15.

[0060] In some embodiments, the light conversion layer 10A is multiplexed as at least one of the first substrate 12, the first adhesive layer 13, and the second substrate 14. That is, a first phosphor can be added to any one of, or any two of, the first substrate 12, the first adhesive layer 13, and the second substrate 14, or in all three of the above-mentioned film layers, so that the first phosphor is dispersed in at least one of the above three film layers. In this way, adding a separate film layer can be avoided, and without adding other optical film materials and without changing the structure of the LED light source, the light emitted by the polarizer 10 is made more flat and continuous, approaching natural light, achieving an eye protection effect.

[0061] In some embodiments, the second substrate 14 includes but is not limited to at least one of triacetyl cellulose, polyethylene terephthalate (PET), polycarbonate, polymethyl methacrylate (PMMA), polycycloolefin, and polyethylene naphthalate.

[0062] In some embodiments, the first adhesive layer 13 can be a pressure-sensitive adhesive (PSA) layer. The first adhesive layer 13 includes but is not limited to acrylate resins.

[0063] In the embodiments of the present application, the light conversion layer 10A (when the light conversion layer 10A is multiplexed as other film layers, that is, the light conversion layer 10A refers to these other film layers) can be formed by an extrusion stretching film-forming method or a coating film-forming method.

[0064] The above extrusion film-forming method includes: adding a first phosphor to polymer particles and stirring and mixing to form a mixture; adding the mixture to a film-forming feeding system and extruding and stretching to form a film.

[0065] The above coating film-forming method includes: mixing a first phosphor with a resin and adding a solvent, and fully stirring to obtain a mixed solution, wherein the solvent includes but is not limited to solvents such as ethyl acetate, butyl acetate, and tetrahydrofuran, and preferably ethyl acetate; adding a heat-curing additive to the mixed solution and coating it on a substrate, wherein the heat-curing additive includes but is not limited to isocyanate additives; heating and drying the coated substrate to further crosslink the resin and cure the film layer.

[0066] It should be noted that the extrusion stretching film-forming method is more suitable for inorganic phosphors because the temperature is high during extrusion and some organic substances cannot withstand it. Of course, organic phosphors with high heat resistance can also use this method. The coating film-forming method is more suitable for organic phosphors, and the solubility of organic substances is better. Of course, inorganic substances can also use this method by combining and dispersing resins.

[0067] In some embodiments, the thickness of the light conversion layer 10A is 10 to 200 micrometers. When the thickness of the light conversion layer 10A is less than this thickness range, the strength of the film layer is poor, and the polarizer 10 is likely to warp when compounded with other film layers. When it is greater than this thickness range, the overall thickness of the polarizer will be too thick, resulting in poor bending performance. Optionally, the thickness of the light conversion layer 10A can be 10 micrometers, 20 micrometers, 30 micrometers, 40 micrometers, 50 micrometers, 60 micrometers, 70 micrometers, 80 micrometers, 90 micrometers, 100 micrometers, 110 micrometers, 120 micrometers, 130 micrometers, 140 micrometers, 150 micrometers, 160 micrometers, 170 micrometers, 180 micrometers, 190 micrometers, 200 micrometers or a value within the range composed of any two of the above values.

[0068] In some embodiments, the mass fraction of the first phosphor in the light conversion layer 10A is 1% to 10%. When the mass fraction of the first phosphor in the light conversion layer 10A is less than 1%, the proportion of light conversion is too low, and it may not be able to effectively fill the missing spectrum between blue light and green light. When the mass fraction of the first phosphor in the light conversion layer 10A is greater than 10%, the absorption of blue light at about 450 nanometers is too high, resulting in a decrease in the color gamut, and at the same time, the risk of the first phosphor aggregating into clusters may increase. Optionally, this mass fraction can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% or a value within the range composed of any two of the above values.

[0069] Optionally, when the light conversion layer 10A is formed by the extrusion stretching film-forming method, the thickness of the light conversion layer 10A can be designed to be 20 to 200 micrometers. Further, the thickness of the light conversion layer 10A can be 20 to 80 micrometers. If the thickness is too thick, the cost of stretching the film will be too high. The mass fraction of the first phosphor in the light conversion layer 10A is 1% to 10%.

[0070] Optionally, when the light conversion layer 10A is formed by the coating film-forming method, the thickness of the light conversion layer 10A can be designed to be 10 to 40 micrometers. Before coating, the solid content of the resin is 5% to 25%, preferably 15%. The first phosphor accounts for 1% to 10% of the total solid mass.

[0071] In some embodiments, the polarizer 10 may further include a second phosphor that emits light at least in the wavelength range of 570 nm to 620 nm, and the second phosphor is dispersed in at least one of the first substrate 12, the first adhesive layer 13, and the second substrate 14. The second phosphor that emits light in the wavelength range of 570 nm to 620 nm can emit orange light. By further adding the second phosphor to the film layer of the polarizer 10, the continuity of the emission spectrum of the light emitted from the polarizer 10 can be further improved.

[0072] Optionally, the second phosphor can be doped with the first phosphor in the same film layer of the polarizer 10, or can be doped in different film layers of the polarizer 10.

[0073] In some embodiments, the second phosphor can absorb light at least in the wavelength range of 400 nm to 460 nm. Specifically, the second phosphor absorbs light in the wavelength range of 400 nm to 420 nm, or absorbs light in the wavelength range of 440 nm to 460 nm. In this way, the second phosphor can absorb part of the blue LED light source and convert it into orange light.

[0074] Optionally, the second phosphor may include at least one of organic fluoroboron dipyrrole derivatives and (Sr,Ca)AlSiN3:Eu-based phosphors.

[0075] The selection and synthesis of organic fluoroboron dipyrrole derivatives can refer to the patent with the publication number CN115003778B, and the synthesis of (Sr,Ca)AlSiN3:Eu-based phosphors can refer to the patent with the publication number CN107437576A, which will not be elaborated here.

[0076] In some embodiments, the polarizer 10 further includes a third phosphor that emits light at least in the wavelength range of 690 nm to 800 nm, and the second phosphor is dispersed in at least one of the first substrate 12, the first adhesive layer 13, and the second substrate 14. The second phosphor that emits light in the wavelength range of 690 nm to 800 nm can emit deep red light. By further adding the third phosphor to the film layer of the polarizer 10, the continuity of the emission spectrum of the light emitted from the polarizer 10 can be further improved.

[0077] In some embodiments, the third phosphor can absorb light at least in the wavelength range of 400 nm to 460 nm. Specifically, the third phosphor absorbs light in the wavelength range of 400 nm to 420 nm, or absorbs light in the wavelength range of 440 nm to 460 nm. In this way, the third phosphor can absorb part of the blue LED light source and convert it into deep red light.

[0078] Optionally, the third phosphor includes but is not limited to organic fluoroboron dipyrrole-based materials,

[0079] (Ca,Sr,Ba)5(PO4)3(Cl,Br):Eu 2+ (Refer to CN109545941A for reference) fluorescent powder.

[0080] In some embodiments, the polarizer 10 further includes an optical functional layer located between the protective film 11 and the polarizing layer 15. Optionally, the optical functional layer can be prepared with one side surface of the first substrate 12 or the second substrate 14 as the bearing surface.

[0081] The optical functional layer can be a single-layer structure or a composite multi-layer structure. The optical functional layer includes but is not limited to at least one of an antiglare layer, a hard coat layer, an antireflection layer, a low reflection layer, an anti-fingerprint layer, and an antistatic layer. For example, the optical functional layer can be a laminated structure of a hard coat layer and an antireflection layer.

[0082] The hard coat layer has high hardness, water and oil repellent properties, can effectively prevent surface scratches of the underlying film layer, and is easier to clean. Optionally, the hard coat has a relatively high glass transition temperature, for example, 70 degrees Celsius to 120 degrees Celsius. The material of the hard coat layer can include at least one of polyurethane resin, acrylate resin, epoxy resin, vinyl resin, and silicone resin.

[0083] The antireflection layer is used for antireflection and can also prevent scratches. The antireflection layer can be a dielectric thin film formed on the surface of the hard coat layer.

[0084] Based on the above polarizer 10, an embodiment of the present application further provides a display device, including the above polarizer 10 and a display panel. The polarizer 10 can be used as a lower polarizer 10, and the polarizer 10 is located between the backlight source and the display panel. The display panel can be a liquid crystal display panel, including an array substrate and a color filter substrate disposed opposite to each other, and a liquid crystal layer is provided between the array substrate and the color filter substrate.

[0085] The light conversion layer 10A can be located on the side of the polarizing layer 15 close to the backlight source. Such a design can make the wavelength range of the light emitted by the light source converted by the light conversion layer wider.

[0086] In some embodiments, the backlight source can be a direct-lit backlight source or a side-lit backlight source.

[0087] In some embodiments, the backlight source can be a blue LED.

[0088] Further, the display device further includes an upper polarizer 10, and the upper polarizer 10 can adopt a conventional polarizer 10.

[0089] The following will detail the present application through specific embodiments.

[0090] Example 1

[0091] Preparation of polarizer 1: 0.45 g of organic boron-nitrogen coordination compound 1 was mixed into 72.75 g of an acrylic resin with a solid content of 20%. Organic boron-nitrogen coordination compound 1 accounted for 3% of the total solid content. Then, 26.80 g of ethyl acetate was added, and the mixture was stirred well for 6 h to prepare a mixed solution with a solid content of 15%. 0.01 g of isocyanate was added, and the mixture was stirred for another 30 min, then cast into a film, heated at 85 °C to dry the solvent and further crosslink the resin to form a 15-mm light conversion layer. This light conversion layer was used as Figure 3 the first adhesive layer 13 in the structure of the polarizer 1 shown; the light conversion layer was compounded with Figure 3 the other structures shown to obtain polarizer 1.

[0092] The structural formula of organic boron-nitrogen coordination compound 1 is as follows:

[0093] As Figure 4 shown, organic boron-nitrogen coordination compound 1 absorbs light with wavelengths from 380 nm to 465 nm and emits light with wavelengths from 440 nm to 550 nm.

[0094] Comparative Example 1:

[0095] Preparation of polarizer Ref-1: 25.00 g of ethyl acetate was added to 75.00 g of an acrylic resin with a solid content of 20%, and the mixture was stirred well for 6 h to prepare a mixed solution with a solid content of 15%. 0.01 g of isocyanate was added, and the mixture was stirred for another 30 min, then cast into a film, heated at 85 °C to dry the solvent and further crosslink the resin to form a 15-mm optical film layer. This optical film layer was used as Figure 3 the first adhesive layer 13 in the structure of the polarizer shown; the light conversion layer was compounded with Figure 3 the other structures shown to obtain polarizer Ref-1.

[0096] After the release film 18 and the protective film 11 of the polarizer 1 prepared in Example 1 and the polarizer Ref-1 prepared in Comparative Example 1 were removed respectively in this application, they were placed on a blue backlight source with the same parameters, and their emission spectra were tested by the same test method. The obtained emission spectra are as shown in Figure 5 shown.

[0097] From Figure 5It can be seen that the polarizer provided in Embodiment 1 of the present application can convert a blue backlight source into cyan / blue-green light with respect to the polarizer Ref-1, reduce the fluctuation degree of the spectrum, and make the spectral bandwidth range of the finally emitted light wider and closer to natural light, having a strong luminous intensity in the range of 420 nanometers to 600 nanometers. In particular, it makes up for the lack of the spectrum in the 470-nanometer to 530-nanometer band, which is beneficial to eye protection.

[0098] After tearing off the release film and the protective film from the polarizer 1 prepared in the above Embodiment 1, it is attached to a display panel and an upper polarizer to obtain a display device, denoted as Device 1. After tearing off the release film and the protective film 11 from the polarizer Ref-1 prepared in Comparative Example 1, it is attached to the same display panel and the upper polarizer to obtain a display device, denoted as Device Ref-1. The Device 1 and the Device Ref-1 are placed on a blue backlight source with the same parameters, and the emission spectra of the two devices are tested by the same test method and compared with the spectrum of the D65 light source (a standard illuminant, daylight with a color temperature of 6504K), and the obtained emission spectrogram is as Figure 6 shown. Among them, the calculation formula of the natural-like light index is as follows:

[0099] From Figure 6 it can be seen that the display device (Device 1) using the polarizer 1 prepared in Embodiment 1 has a higher natural-like light index, reaching 50%, and is closer to the D65 light source spectrum. The display device (Device REF-1) using the polarizer Ref-1 prepared in Comparative Example 1 has a natural-like light index of only 22%. It can be seen that the emission spectrum of the display device provided in the embodiment of the present application is closer to natural light and is more friendly to the eyes.

[0100] In summary, the embodiment of the present application provides a polarizer 10 and a display device, including a polarizing layer 15 and a light conversion layer 10A. The polarizing layer 15 includes an incident light side and an outgoing light side that are opposite to each other. The light conversion layer 10A is disposed on the incident light side of the polarizing layer 15, and a first phosphor is dispersed in the light conversion layer 10A, and the first phosphor emits light at least in the band of 470 nanometers to 530 nanometers. By adding a first phosphor that emits light at least in the 470-nanometer to 530-nanometer band to the film layer of the polarizer 10 in the embodiment of the present application, the emission spectrum of the light emitted from the polarizer 10 can be made more flat and continuous without changing the backlight LED light source, the emitted light is closer to natural light, achieving an eye protection effect, and being beneficial to the development of four-color or even multi-color high-color gamut display devices.

[0101] In the description of this application, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0102] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0103] The embodiments, implementation manners and related technical features of this application can be combined and replaced with each other without conflict.

[0104] The above are only the preferred embodiments of this application and do not impose any formal limitations on this application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application still fall within the scope of the technical solution of this application.

Claims

1. A polarizer, characterized in that, Comprising: A polarizing layer; And A light conversion layer disposed on a first side of the polarizing layer; Wherein, a first phosphor is dispersed in the light conversion layer, and the first phosphor emits light at least in a wavelength band of 470 nm to 530 nm.

2. The polarizing plate according to claim 1, wherein The first phosphor absorbs light at least in a wavelength band of 400 nm to 460 nm.

3. The polarizer according to claim 1, wherein The polarizing sheet further comprises: A first substrate disposed on the first side of the polarizing layer; Wherein, the light conversion layer is multiplexed as the first substrate.

4. The polarizing plate according to claim 1, wherein, The polarizing sheet further comprises: A first substrate disposed on the first side of the polarizing layer; A first adhesive layer disposed between the first substrate and the polarizing layer; and; A second substrate disposed between the first adhesive layer and the polarizing layer; Wherein, the light conversion layer is multiplexed as at least one of the first substrate, the first adhesive layer, and the second substrate.

5. The polarizing plate according to claim 4, wherein, The polarizing sheet further comprises a second phosphor that emits light at least in a wavelength band of 570 nm to 620 nm, and the second phosphor is dispersed in at least one of the first substrate, the first adhesive layer, and the second substrate.

6. The polarizer according to claim 4, wherein, The polarizing sheet further comprises a third phosphor that emits light at least in a wavelength band of 690 nm to 800 nm, and the second phosphor is dispersed in at least one of the first substrate, the first adhesive layer, and the second substrate.

7. The polarizer according to claim 4, wherein, The materials of the first substrate and the second substrate include at least one of triacetyl cellulose, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polycycloolefin, polyethylene naphthalate; and / or The material of the first adhesive layer includes an acrylate resin.

8. The polarizing plate according to claim 3 or 4, characterized in that The thickness range of the light conversion layer is 10 μm to 200 μm.

9. The polarizing plate according to claim 3 or 4, characterized in that, The mass fraction range of the first phosphor in the light conversion layer is 1% to 10%.

10. The polarizer according to claim 1, wherein The first phosphor includes at least one of an organic boron-nitrogen coordination compound and a rare earth inorganic compound.

11. The polarizer according to claim 10, wherein The organic boron-nitrogen coordination compound includes at least one of the compounds represented by the following structural formula: The rare earth inorganic compound includes (Ca, Sr, Ba)4Al 14 O 25 :Eu 2+ and at least one of (Ca, Sr, Ba)8MgSi4O 16 (F, Cl, Br)2:Eu 2+ .

12. A display device, comprising the polarizing sheet according to any one of claims 1-11, a backlight, and a display panel, wherein the polarizing sheet is located between the backlight and the display panel, and the light conversion layer is located on a side of the polarizing layer close to the backlight.

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