Polarizer and display device

Abstract

An embodiment of the present invention discloses a polarizer and a display device, the polarizer including a polarizing layer and a first optical functional layer located on one side of the polarizing layer, the first optical functional layer including a substrate and light diffusing particles dispersed in the substrate, and an average value of the difference between the orientation angle of the orthogonal projection of the long axis of the light diffusing particles in the first plane and the orientation angle of the orthogonal projection of the absorption axis of the polarizing layer in the first plane is 5° or less.

Description

[Technical field]

[0001] The present invention relates to the display field, and in particular to polarizers and display devices. [Background technology]

[0002] At present, in order to expand the chromaticity viewing angle of a display device, it is common to provide an optical film for expanding the chromaticity viewing angle on the outermost side of a polarizer. Existing optical films used to expand the chromaticity viewing angle require an additional film layer corresponding to the polarizer, which increases the thickness of the polarizer, reduces the output light of the display device, and reduces the display contrast of the display device. Summary of the Invention [Problem to be solved by the invention]

[0003] Therefore, there is an urgent need for a polarizer and a display device to solve the above technical problems. [Means for solving the problem]

[0004] The present invention provides a polarizer and a display device that can alleviate the current technical problem of reduced display contrast of a display device by adding a film layer to a polarizer to reduce the emitted light of the display device.

[0005] In order to solve the above problems, the technical solutions provided in this application are as follows:

[0006] The present invention provides a polarizer, the polarizer comprising: A polarizing layer; a first optical functional layer located on one surface of the polarizing layer, the first optical functional layer including a substrate and light diffusing particles dispersed in the substrate; wherein the glass transition temperature of the substrate is 30°C to 500°C, and the elastic modulus of the substrate is 500MPa to 5000MPa at 23°C; The orthogonal projection of the long axis of the light diffusing particle on a first plane has a first orientation angle, the orthogonal projection of the absorption axis of the polarizing layer on the first plane has a second orientation angle, the average value of the difference between the first orientation angle and the second orientation angle is 5° or less, and the first plane is parallel to a plane in which the polarizing layer is located.

[0007] Preferably, there is an included angle between the major axis of the light diffusing particle and the first plane, the included angle being an acute angle, and the angle of the included angle is 40° or less.

[0008] Preferably, the light diffusing particles are selected from at least one of a first type of light diffusing particles, a second type of light diffusing particles, a third type of light diffusing particles, a fourth type of light diffusing particles, and a fifth type of light diffusing particles; wherein the variation in diameter of the first type of light diffusing particle along the extension direction of the long axis of the first type of light diffusing particle is 0.3 microns or less; Along the extension direction of the long axis of the second type light diffusing particle, the diameter of the central portion of the second type light diffusing particle is changed by less than 1 micron, along the direction away from the central portion of the second type light diffusing particle, the diameter of the first end of the second type light diffusing particle gradually decreases, and the diameter of the second end of the second type light diffusing particle is changed by less than 1 micron; Along the extension direction of the long axis of the third type light diffusing particle, the change value of the diameter of the central part of the third type light diffusing particle is less than 1 micron, along the direction away from the central part of the third type light diffusing particle, the diameter of the first end of the third type light diffusing particle gradually decreases, and the diameter of the second end of the third type light diffusing particle gradually decreases; a first end of the fourth type light diffusing particle is connected to a second end of the fourth type light diffusing particle in sequence, and a diameter of the fourth type light diffusing particle gradually decreases along a direction from the first end of the fourth type light diffusing particle to the second end of the fourth type light diffusing particle; The first end of the fifth type light diffusing particle is connected to the second end of the fifth type light diffusing particle in sequence, and along the direction away from the second end of the fifth type light diffusing particle, the diameter of the first end of the fifth type light diffusing particle gradually decreases, and along the direction away from the first end of the fifth type light diffusing particle, the diameter of the second end of the fifth type light diffusing particle gradually decreases.

[0009] Preferably, the first type of light diffusing particles are rod-shaped particles, the second type of light diffusing particles are needle-shaped particles with a reduced diameter at one end, the third type of light diffusing particles are needle-shaped particles with a reduced diameter at both ends, the fourth type of light diffusing particles are cone-shaped particles, and the fifth type of light diffusing particles are bicone-shaped particles.

[0010] Preferably, the light diffusing particles are selected from at least two of the first type of light diffusing particles, the second type of light diffusing particles, the third type of light diffusing particles, the fourth type of light diffusing particles, and the fifth type of light diffusing particles.

[0011] Preferably, the light diffusing particles are selected from a first type of light diffusing particles, a second type of light diffusing particles, and a third type of light diffusing particles.

[0012] Preferably, said light diffusing particles are selected from said first type light diffusing particles, said fourth type light diffusing particles, and said fifth type light diffusing particles.

[0013] Preferably, the light diffusing particles are selected from the first type of light diffusing particles, the second type of light diffusing particles, the third type of light diffusing particles, the fourth type of light diffusing particles, and the fifth type of light diffusing particles.

[0014] Preferably, the mass fraction of the first type of light diffusing particles in the light diffusing particles is 1% to 8%, the mass fraction of the second type of light diffusing particles and the fourth type of light diffusing particles in the light diffusing particles is 40% to 50%, and the mass fraction of the third type of light diffusing particles and the fifth type of light diffusing particles in the light diffusing particles is 45% to 55%.

[0015] Preferably, the material of the substrate is selected from at least one of cellulose triacetate, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polycycloolefin, and polyethylene naphthalate.

[0016] Preferably, the material of the substrate is selected from cellulose triacetate; Here, the average value of the difference between the first orientation angle and the second orientation angle is 2.3° or less.

[0017] Preferably, the material of the substrate is selected from polyethylene terephthalate or polymethyl methacrylate; Here, the average value of the difference between the first orientation angle and the second orientation angle is 3.5° or less.

[0018] Preferably, the ratio of the major axis of the light diffusing particle to the diameter of the light diffusing particle is 1 or more, and the ratio of the major axis of the light diffusing particle to the diameter of the light diffusing particle is 100 or less.

[0019] Preferably, the major axis of the light diffusing particles is 5 microns or more, and the major axis of the light diffusing particles is 50 microns or less.

[0020] Preferably, the surface of the light diffusing particles comprises at least one of inorganic cationic groups, inorganic anionic groups, polymeric groups, coupling agent groups, or surfactant groups.

[0021] Preferably, the mass fraction of the light diffusing particles in the first optical functional layer is 3% or more, and the mass fraction of the light diffusing particles in the first optical functional layer is 30% or less.

[0022] Preferably, the absolute value of the difference in refractive index between the substrate and the light diffusing particles is 0.02 or more.

[0023] Preferably, the thickness of the first optical functional layer is 15 microns or more, and the thickness of the first optical functional layer is 150 microns or less.

[0024] Preferably, the polarizer further comprises a second optically functional layer located on at least one side of the substrate, the second optically functional layer comprising at least one of an antiglare sublayer, a transparent cured sublayer, a low-reflection sublayer, an antireflection sublayer, an antifingerprint sublayer, and an antistatic sublayer; Here, the second optical functional layer is located between the polarizing layer and the first optical functional layer, or The second optical functional layer is located on a side of the first optical functional layer away from the polarizing layer.

[0025] Preferably, the thickness of the first optical functional layer is 15 microns or more, and the thickness of the first optical functional layer is 150 microns or less.

[0026] The present invention further provides a display device comprising a polarizer, the polarizer comprising: A polarizing layer; a first optical functional layer located on one surface of the polarizing layer, the first optical functional layer including a substrate and light diffusing particles dispersed in the substrate; wherein the glass transition temperature of the substrate is 30°C to 500°C, and the elastic modulus of the substrate is 500MPa to 5000MPa at 23°C; The orthogonal projection of the long axis of the light diffusing particle on a first plane has a first orientation angle, the orthogonal projection of the absorption axis of the polarizing layer on the first plane has a second orientation angle, the average value of the difference between the first orientation angle and the second orientation angle is 5° or less, and the first plane is parallel to a plane in which the polarizing layer is located. Effect of the Invention

[0027] By disposing light diffusing particles in the first optical functional layer of a polarizer, the present invention improves the chromaticity viewing angle of a display device using this polarizer, while eliminating the need to add a film layer to the polarizer, reducing the loss of exiting light from the display device, and improving the contrast of the display device. [Brief description of the drawings]

[0028] [Figure 1] FIG. 2 is a first structural schematic diagram of a polarizer shown in an embodiment of the present invention. [Diagram 2] FIG. 2 is a second structural schematic diagram of a polarizer shown in an embodiment of the present invention. [Diagram 3] FIG. 4 is a schematic diagram of a third structure of a polarizer shown in an embodiment of the present invention. [Figure 4] FIG. 4 is a schematic diagram of a fourth structure of a polarizer shown in an embodiment of the present invention. [Diagram 5] FIG. 5 is a schematic diagram of the fifth structure of a polarizer shown in an embodiment of the present invention. [Figure 6] FIG. 1 is a first structural schematic diagram of a polarizer in the prior art; [Figure 7] FIG. 2 is a second structural schematic diagram of a polarizer in the prior art. [Figure 8] 1 is a structural schematic diagram of a display device according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] The present application provides a polarizer and a display device, and in order to make the objectives, technical solutions and effects of the present application clearer, the present application will be described in more detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to interpret the present application, and are not used to limit the present application.

[0030] Currently, it is necessary to add an optical film in addition to the polarizer to expand the chromaticity viewing angle, but this increases the thickness of the polarizer, which reduces the emitted light of a display device using a polarizer and reduces the display contrast.

[0031] 1 to 5, an embodiment of the present invention provides a polarizer 100, the polarizer 100 including a polarizing layer 101 and a first optical functional layer 102 located on one side of the polarizing layer 101, the first optical functional layer 102 including a substrate 102a and light diffusion particles 102b dispersed in the substrate 102a, wherein the glass transition temperature of the substrate 102a is 30°C to 500°C, the elastic modulus of the substrate 102a is 500MPa to 5000MPa at 23°C, the orthogonal projection of the long axis of the light diffusion particles 102b on a first plane has a first orientation angle, the orthogonal projection of the absorption axis of the polarizing layer 101 on the first plane has a second orientation angle, the average value of the difference between the first orientation angle and the second orientation angle is 5° or less, and the first plane is parallel to a plane on which the polarizing layer 101 is located.

[0032] In the present invention, by disposing light diffusing particles 102b in the first optical functional layer 102 of the polarizer 100, the chromaticity viewing angle of a display device using this polarizer 100 is improved, an additional film layer is not required for the polarizer 100, the loss of output light from the display device is reduced, and the contrast of the display device is improved.

[0033] Next, the technical solutions of the present invention will be described with reference to specific embodiments.

[0034] Referring to Figures 1 to 5, in some embodiments, the difference between the first orientation angle and the second orientation angle is an angle difference between the first orientation angle and the second orientation angle, the difference between the first orientation angle and the second orientation angle is an absolute value, and the average value of the difference between the first orientation angle and the second orientation angle is 5° or less, and may be 0°, 0.5°, 1°, 1.3°, 1.5°, 1.8°, 2°, 2.3°, 2.5°, 2.8°, 3°, 3.3°, 3.5°, 3.8°, 4°, 4.3°, 4.5°, 4.8°, etc., indicating that the average angle difference between the first orientation angle and the second orientation angle is -5° to 5°. By setting the absolute value of the angle difference between the orthogonal projection of the long axis of the light diffusing particle 102b on the first plane and the orthogonal projection of the absorption axis of the polarizing layer 101 on the first plane to 5° or less, the propagation direction of more light can be changed through the light diffusing particle 102b, thereby improving the chromaticity viewing angle and contrast improvement effect.

[0035] In some embodiments, there is an included angle between the long axis of the light diffusion particle 102b and the first plane, the included angle is an acute angle, and the angle of the included angle is less than 40°, for example, may be 2°, 5°, 8°, 10°, 12°, 15°, 18°, 20°, 22°, 25°, 28°, 30°, 32°, 35°, 38°, 40°. The long axis of the light diffusion particle 102b has an included angle with the first plane in space, which helps to further change the propagation direction of more light through the light diffusion particle 102b, thereby improving the chromaticity viewing angle and contrast improvement effect.

[0036] In some embodiments, the orthogonal projection of the long axis of the light diffusing particle 102b on the second plane has a third orientation angle, the orthogonal projection of the absorption axis of the polarizing layer 101 on the second plane has a fourth orientation angle, the average value of the difference between the third orientation angle and the fourth orientation angle is -5° or more, the average value of the difference between the third orientation angle and the fourth orientation angle is 5° or less, the second plane is perpendicular to the plane in which the polarizing layer 101 is located, the second plane is non-perpendicular to the absorption axis of the polarizing layer 101, and the second plane is non-perpendicular to the long axis of the light diffusing particle 102b. By making the absolute value of the angle difference between the orthogonal projection of the long axis of the light diffusion particle 102b on the second plane and the orthogonal projection of the absorption axis of the polarizing layer 101 on the second plane less than or equal to 5°, the long axis of the light diffusion particle 102b is kept approximately parallel to the absorption axis of the polarizing layer 101 in space, which helps to further change the propagation direction of more light passing through the light diffusion particle 102b, thereby improving the chromaticity viewing angle and contrast improvement effect.

[0037] In some embodiments, the difference between the third orientation angle and the fourth orientation angle is an angle difference between the third orientation angle and the fourth orientation angle, the difference between the third orientation angle and the fourth orientation angle is an absolute value, and the average value of the difference between the third orientation angle and the fourth orientation angle is 5° or less, for example, 0°, 0.5°, 1°, 1.3°, 1.5°, 1.8°, 2°, 2.3°, 2.5°, 2.8°, 3°, 3.3°, 3.5°, 3.8°, 4°, 4.3°, 4.5°, 4.8°, etc., indicating that the average angle difference between the third orientation angle and the fourth orientation angle is -5° to 5°.

[0038] In some embodiments, the average difference between the first orientation angle and the second orientation angle is 5° or less, i.e., when the second orientation angle is 0°, the average included angle between the first orientation angle and the second orientation angle is 5° or less. The average difference between the third orientation angle and the fourth orientation angle is 5° or less, i.e., when the fourth orientation angle is 0°, the average included angle between the third orientation angle and the fourth orientation angle is 5° or less.

[0039] The average value of the difference between the first orientation angle and the second orientation angle in the first optical functional layer 102 and the average value of the difference between the third orientation angle and the fourth orientation angle can be obtained by photographing the first optical functional layer 102 with an optical microscope and performing statistical analysis using an existing program.

[0040] In some embodiments, the light diffusing particles 102b are selected from at least one of a first type of light diffusing particles, a second type of light diffusing particles, a third type of light diffusing particles, a fourth type of light diffusing particles, and a fifth type of light diffusing particles.

[0041] Here, the first type light diffusing particles, the second type light diffusing particles, the third type light diffusing particles, the fourth type light diffusing particles, and the fifth type light diffusing particles have different shapes.

[0042] In some embodiments, along the extension direction of the long axis of the first type light diffusing particle, the change in diameter of the first type light diffusing particle is less than 0.3 microns, such as 0 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. In some embodiments, along the extension direction of the long axis of the first type light diffusing particle, the diameter of the first end of the first type light diffusing particle is the same as the diameter of the central portion of the first type light diffusing particle, and the diameter of the second end of the first type light diffusing particle is the same as the diameter of the central portion of the first type light diffusing particle.

[0043] In some embodiments, the first type of light diffusing particle may be rod-shaped, and when the first type of light diffusing particle is rod-shaped, the cross section of the first type of light diffusing particle in a plane perpendicular to the long axis of the first type of light diffusing particle is circular or elliptical. When the orthogonal projection of the first type of light diffusing particle in a plane perpendicular to the long axis of the first type of light diffusing particle is elliptical, the diameter of the first type of light diffusing particle is the length of the long axis of the ellipse, and the ratio of the long axis of the ellipse to the short axis of the ellipse is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0044] In some embodiments, the change in diameter of the center of the second type of light diffusing particle along the extension direction of the long axis of the second type of light diffusing particle is less than 1 micron, for example, 0 microns, 0.95 microns, 0.8 microns, 0.78 microns, 0.75 microns, 0.72 microns, 0.7 microns, 0.68 microns, 0.65 microns, 0.62 microns, 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. Along a direction away from the center of the second type light diffusing particle, the diameter of the first end of the second type light diffusing particle gradually decreases, and the change value of the diameter of the second end of the second type light diffusing particle is less than 1 micron, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 micron, 0.58 micron. long, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. In some embodiments, the diameter of the first ends of the second type light diffusing particles gradually decreases along a direction away from the center of the second type light diffusing particles, and the diameter of the second ends of the second type light diffusing particles is the same as the diameter of the center of the second type light diffusing particles.

[0045] In some embodiments, the second type of light diffusing particles may be needle-like with a reduced diameter at one end.

[0046] In some embodiments, the orthogonal projection of the second type light diffusing particle in a plane perpendicular to the long axis of the second type light diffusing particle may be circular or elliptical, and when the orthogonal projection of the second end of the second type light diffusing particle or the central portion of the second type light diffusing particle in a plane perpendicular to the long axis of the second type light diffusing particle forms an ellipse, the ratio of the major axis of the ellipse to the minor axis of the ellipse is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shape formed by the first end of the second type light diffusing particle in any plane perpendicular to the long axis of the second type light diffusing particle coincides with the cross-sectional shape formed by the central portion of the second type light diffusing particle in any plane perpendicular to the long axis of the second type light diffusing particle, and the area gradually decreases along the direction away from the central portion of the second type light diffusing particle.

[0047] In some embodiments, the change in diameter of the central portion of the third type light diffusing particle along the extension direction of the long axis of the third type light diffusing particle is less than 1 micron, for example, 0 microns, 0.95 microns, 0.8 microns, 0.78 microns, 0.75 microns, 0.72 microns, 0.7 microns, 0.68 microns, 0.65 microns, 0.62 microns, 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.5 ... The diameter of the third type light diffusing particle may be 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc., and the diameter of the first end of the third type light diffusing particle gradually decreases and the diameter of the second end of the third type light diffusing particle gradually decreases along the direction away from the center of the third type light diffusing particle. In some embodiments, the diameter of the center of the third type light diffusing particle is uniform, and the diameters of the first end of the third type light diffusing particle and the second end of the third type light diffusing particle gradually change along the extension direction of the major axis of the third type light diffusing particle.

[0048] In some embodiments, the third type of light diffusing particles may be needle-like with a reduced diameter at both ends.

[0049] In some embodiments, the orthogonal projection of the third type light diffusing particle in a plane perpendicular to the long axis of the third type light diffusing particle may be circular or elliptical, and when the orthogonal projection of the central portion of the third type light diffusing particle in a plane perpendicular to the long axis of the third type light diffusing particle forms an ellipse, the ratio of the major axis of the ellipse to the minor axis of the ellipse is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shape formed by the first end of the third type light diffusing particle and the second end of the third type light diffusing particle in any plane perpendicular to the long axis of the third type light diffusing particle coincides with the cross-sectional shape formed by the central portion of the third type light diffusing particle in any plane perpendicular to the long axis of the third type light diffusing particle, and the area gradually decreases along the direction away from the central portion of the third type light diffusing particle.

[0050] In some embodiments, the first end of the fourth type light diffusing particle is sequentially connected to the second end of the fourth type light diffusing particle, and the diameter of the fourth type light diffusing particle gradually decreases along the direction from the first end of the fourth type light diffusing particle to the second end of the fourth type light diffusing particle.

[0051] In some embodiments, the fourth type of light diffusing particles may be cone-shaped.

[0052] The cross section of the fourth type light diffusing particle in a plane perpendicular to the long axis of the fourth type light diffusing particle is circular or elliptical. Along the direction from the first end of the fourth type light diffusing particle to the second end of the fourth type light diffusing particle, the shape of the cross section of the fourth type light diffusing particle in a plane perpendicular to the long axis of the fourth type light diffusing particle is constant, and its area gradually decreases. When the cross section of the fourth type light diffusing particle in a plane perpendicular to the long axis of the fourth type light diffusing particle is elliptical, the diameter of the fourth type light diffusing particle is the length of the long axis of the ellipse, and the ratio of the long axis of the ellipse to the short axis of the ellipse is greater than 1 and less than or equal to 3, and may be, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0053] In some embodiments, the first end of the fifth type light diffusing particle is connected in sequence to the second end of the fifth type light diffusing particle, and along a direction away from the second end of the fifth type light diffusing particle, a diameter of the first end of the fifth type light diffusing particle gradually decreases, and along a direction away from the first end of the fifth type light diffusing particle, a diameter of the second end of the fifth type light diffusing particle gradually decreases.

[0054] In some embodiments, the fifth type of light diffusing particles may be bipyramidal in shape.

[0055] The cross section of the fifth type light diffusing particle in a plane perpendicular to the long axis of the fifth type light diffusing particle is circular or elliptical. Along the direction away from the second end of the fifth type light diffusing particle, the shape of the cross section of the first end of the fifth type light diffusing particle in a plane perpendicular to the long axis of the fifth type light diffusing particle is constant, and its area gradually decreases, along the direction away from the first end of the fifth type light diffusing particle, the shape of the cross section of the second end of the fifth type light diffusing particle in a plane perpendicular to the long axis of the fifth type light diffusing particle is constant, and its area gradually decreases. When the cross section of the fifth type light diffusing particle in a plane perpendicular to the long axis of the fifth type light diffusing particle is elliptical, the diameter of the fifth type light diffusing particle is the length of the long axis of the ellipse, and the ratio of the long axis of the ellipse to the short axis of the ellipse is greater than 1 and less than or equal to 3, and may be, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0056] In some embodiments, the light diffusing particles 102b are selected from at least two of the first type of light diffusing particles, the second type of light diffusing particles, the third type of light diffusing particles, the fourth type of light diffusing particles, and the fifth type of light diffusing particles, and preferably, the light diffusing particles 102b are a mixture of the first type of light diffusing particles, the second type of light diffusing particles, and the third type of light diffusing particles, or the light diffusing particles 102b are a mixture of the first type of light diffusing particles, the fourth type of light diffusing particles, and the fifth type of light diffusing particles, or the light diffusing particles 102b are a mixture of the first type of light diffusing particles, the second type of light diffusing particles, the third type of light diffusing particles, the fourth type of light diffusing particles, and the fifth type of light diffusing particles. By selecting the light diffusing particles 102b from at least two particles of different shapes, the diversity of shapes of the light diffusing particles 102b is increased, the optical anisotropy of the light diffusing particles 102b is increased, and the contrast and brightness improvement effect of the light diffusing particles 102b is improved.

[0057] In some embodiments, when the light diffusion particles 102b are selected from a first type of light diffusion particles, a second type of light diffusion particles, and a third type of light diffusion particles, or when the light diffusion particles 102b are selected from the first type of light diffusion particles, the fourth type of light diffusion particles, and the fifth type of light diffusion particles, or when the light diffusion particles 102b are a mixture of the first type of light diffusion particles, the second type of light diffusion particles, the third type of light diffusion particles, the fourth type of light diffusion particles, and the fifth type of light diffusion particles, the mass fraction of the first type of light diffusion particles in the light diffusion particles 102b is 1% to 8%. The mass fraction of the second type light diffusing particles and / or the fourth type light diffusing particles in the light diffusing particles 102b may be 40% to 50%, for example, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, etc., and the mass fraction of the third type light diffusing particles and / or the fifth type light diffusing particles in the light diffusing particles 102b may be 45% to 55%, for example, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, etc. By mixing the first type of light diffusing particles, the second type of light diffusing particles, and / or the fourth type of light diffusing particles, the third type of light diffusing particles, and / or the fifth type of light diffusing particles in the above-mentioned ratio, the contrast and brightness improvement effect of the obtained light diffusing particles 102b can be further improved.

[0058] In some embodiments, the mass fraction of the light diffusing particles 102b in the first optical functional layer 102 is 3% to 30%, for example, 5%, 8%, 10%, 13%, 15%, 18%, 20%, 23%, 25%, 28%, etc., which is advantageous for playing an obvious light diffusing role while avoiding an influence on the light transmittance of the optical functional layer.

[0059] In some embodiments, the length of the long axis of the light diffusion particle 102b is the distance between the two end points of the long axis of the light diffusion particle 102b along the direction of the long axis of the light diffusion particle 102b. The long axis of the light diffusion particle 102b is 5 microns or more, and the long axis of the light diffusion particle 102b is 50 microns or less, for example, 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, etc., and when the length of the long axis of the light diffusion particle 102b is within the above range, the long axis of the light diffusion particle 102b is easily aligned, and it is easy to make the average value of the difference between the first orientation angle and the second orientation angle 5° or less, and the average value of the difference between the third orientation angle and the fourth orientation angle 5° or less. Preferably, the long axis of the light diffusing particle 102b is 10 microns or more, and the long axis of the light diffusing particle 102b is 30 microns or less, which is more advantageous in making it easier to align the long axis of the light diffusing particle 102b, and it is easier to make the average value of the difference between the first orientation angle and the second orientation angle 5° or less, and the average value of the difference between the third orientation angle and the fourth orientation angle 5° or less.

[0060] In some embodiments, the diameter of the light diffusing particles 102b is 0.5 microns or more, and the diameter of the light diffusing particles 102b is 5 microns or less, for example, 0.6 microns, 0.7 microns, 0.8 microns, 0.9 microns, 1 micron, 1.2 microns, 1.5 microns, 1.8 microns, 2 microns, 2.5 microns, 3 microns, 3.5 microns, 4 microns, 4.5 microns, etc., which is advantageous to obtain an aspect ratio that allows more light to pass through the major axis surface of the light diffusing particles 102b and change the propagation direction. Preferably, the diameter of the light diffusing particles 102b is 0.5 microns or more, and the diameter of the light diffusing particles 102b is 2 microns or less, which is more advantageous to obtain an aspect ratio that allows more light to pass through the major axis surface of the light diffusing particles 102b and change the propagation direction.

[0061] In some embodiments, the aspect ratio of the light diffusing particles 102b is the ratio of the length of each light diffusing particle to the maximum diameter of the light diffusing particle. The aspect ratio of the light diffusing particles 102b is 1 or more, and the aspect ratio of the light diffusing particles 102b is 100 or less, for example, 2, 5, 10, 12, 15, 16, 18, 20, 30, 32, 34, 35, 36, 38, 40, 42, 45, 46, 48, 50, 52, 55, 56, 58, 60, 62, 65, 68, 70, 80, 90, etc. Preferably, the aspect ratio of the light diffusing particles 102b is 5 or more, and the aspect ratio of the light diffusing particles 102b is 60 or less.

[0062] In some embodiments, the material of the substrate 102a is selected from a resin material, and for example, the material of the substrate 102a may be selected from at least one of triacetate cellulose (TAC), polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), copolymers of cycloolefin (COC), and polyethylene naphthalate two formic acid glycol ester (PEN).

[0063] In some embodiments, the material selection of the substrate 102a is different, and the method of forming the substrate 102a is different. For example, depending on the material forming the substrate 102a, the substrate 102a may be formed without stretching, may be formed by stretching along a first direction, or may be formed by stretching along the first direction and then stretching along a second direction. Here, the first direction is parallel to the direction of the absorption axis of the polarizing layer 101, and the second direction is perpendicular to the first direction. When the substrate 102a is formed by stretching along a first direction, the light diffusion particles 102b are dispersed in the resin material forming the substrate 102a, and the light diffusion particles 102b are also stretched along the first direction, and the orientation of the major axis of the light diffusion particles 102b is adjusted during the formation of the substrate 102a, which is advantageous for further reducing the average value of the difference between the first orientation angle and the second orientation angle and / or the average value of the difference between the third orientation angle and the fourth orientation angle. When the base material 102a is formed by stretching along the first direction and then stretching along the second direction, the light diffusing particles 102b are dispersed in the resin material forming the base material 102a, and the light diffusing particles 102b are also stretched along the first direction and also along the second direction, and the orientation of the major axis of the light diffusing particles 102b is also adjusted during the formation of the base material 102a, which is advantageous for reducing the average value of the difference between the first orientation angle and the second orientation angle and / or the average value of the difference between the third orientation angle and the fourth orientation angle.

[0064] Therefore, the extreme value of the average value of the difference between the first orientation angle and the second orientation angle in the base material 102a formed without stretching is larger than the extreme value of the average value of the difference between the first orientation angle and the second orientation angle in the base material 102a formed by stretching along the first direction, and the extreme value of the average value of the difference between the first orientation angle and the second orientation angle in the base material 102a formed without stretching is larger than the extreme value of the average value of the difference between the first orientation angle and the second orientation angle in the base material 102a formed by stretching along the first direction and then stretching along the second direction. The extreme value of the average value of the difference between the first orientation angle and the second orientation angle, i.e., the maximum value that the average value of the difference between the first orientation angle and the second orientation angle can take is, for example, when the average value of the difference between the first orientation angle and the second orientation angle is 5° or less, the average value of the difference between the first orientation angle and the second orientation angle is 5°.

[0065] The extreme value of the average value of the difference between the third orientation angle and the fourth orientation angle in the base material 102a formed without stretching is larger than the extreme value of the average value of the difference between the third orientation angle and the fourth orientation angle in the base material 102a formed by stretching along the first direction, and the extreme value of the average value of the difference between the third orientation angle and the fourth orientation angle in the base material 102a formed without stretching is larger than the extreme value of the average value of the difference between the third orientation angle and the fourth orientation angle in the base material 102a formed by stretching along the first direction and then stretching along the second direction. The extreme value of the average value of the difference between the third orientation angle and the fourth orientation angle, i.e., the maximum value that the average value of the difference between the third orientation angle and the fourth orientation angle can take is, for example, 5° when the average value of the difference between the third orientation angle and the fourth orientation angle is 5°.

[0066] In some embodiments, when the material of the substrate 102a is selected from cellulose triacetate, the substrate 102a may be formed without stretching or by stretching along the first direction. When the material of the substrate 102a is selected from polyethylene terephthalate or polyethylene naphthalate, the substrate 102a may be formed by stretching along the first direction, or by stretching along the first direction and then along the second direction. When the material of the substrate 102a is selected from polymethylmethacrylate, the substrate 102a may be formed by stretching along the first direction and then along the second direction. When the material of the substrate 102a is selected from polycycloolefin or polycarbonate, the substrate 102a may be formed without stretching, or by stretching along the first direction, or by stretching along the first direction and then along the second direction.

[0067] In some embodiments, when the material of the substrate 102a is selected from cellulose triacetate, the substrate 102a is formed by stretching cellulose triacetate along a first direction, and when the first optical functional layer 102 is formed, the light diffusion particles 102b are also stretched along the first direction, and when the substrate 102a is formed, the orientation of the major axis of the light diffusion particles 102b is adjusted, and the average value of the difference between the first orientation angle and the second orientation angle is less than or equal to 2.3°, for example, 0. and / or the average value of the difference between the third orientation angle and the fourth orientation angle is 2.3° or less, for example, 0°, 1.3°, 1.5°, 1.8°, 2°, 2.2°, etc., indicating that the average angle difference between the first orientation angle and the second orientation angle is -2.3° to 2.3°; and / or the average value of the difference between the third orientation angle and the fourth orientation angle is 2.3° or less, for example, 0°, 1.3°, 1.5°, 1.8°, 2°, 2.2°, etc., indicating that the average angle difference between the third orientation angle and the fourth orientation angle is -2.3° to 2.3°.

[0068] In some embodiments, the material of the substrate 102a is polyethylene terephthalate or polymethyl methacrylate, and the substrate 102a is formed by stretching along the first direction and then stretching along the second direction, and the light diffusing particles 102b are also stretched along the first direction and then stretched along the second direction, and the orientation of the major axis of the light diffusing particles 102b is adjusted twice during the formation of the substrate 102a, and the average value of the difference between the first orientation angle and the second orientation angle is less than 3.5°, for example, 0°, 1.3°, 1.5°, 1.6°, 1.8°, 1.9°, 2.0°, 2.5°, 3.0°, 4.0°, 5.0°, 6.0°, 7.0°, 8.0°, 9.0°, 10.0°, 11.0°, 12.0°, 13.0°, 14.0°, 15.0°, 16.0°, 17.0°, 18.0°, 19.0°, 20.0°, 21.0°, 22.0°, 23.0°, 24.0°, 25.0°, 26.0°, 27.0°, 28.0°, 29.0°, 30.0°, 31.0°, 32.0°, 33.0°, 34.0°, 35.0°, 36.0°, 37.0°, 38.0°, 39.0°, 40.0°, 41.0°, 42.0°, 43.0°, 44.0°, 45.0°, 46.0°, 47.0°, 48.0°, 49. and / or the average value of the difference between the third orientation angle and the fourth orientation angle is 3.5° or less, for example, 0°, 1.3°, 1.5°, 1.8°, 2°, 2.3°, 2.5°, 2.8°, 3°, 3.3°, etc., indicating that the average angle difference between the first orientation angle and the second orientation angle is -3.5° to 3.5°, and / or the average value of the difference between the third orientation angle and the fourth orientation angle is 3.5° or less, for example, 0°, 1.3°, 1.5°, 1.8°, 2°, 2.3°, 2.5°, 2.8°, 3°, 3.3°, etc., indicating that the average angle difference between the third orientation angle and the fourth orientation angle is -3.5° to 3.5°.

[0069] In some embodiments, the light diffusing particles 102b are whiskers. The light diffusing particles 102b are selected from at least one of silicon dioxide, silicon carbide, silicon nitride, zinc oxide, magnesium oxide, aluminum oxide, calcium sulfate, calcium carbonate, potassium titanate, and aluminum borate.

[0070] In some embodiments, the light diffusing particles 102b can be surface-modified to facilitate the dispersion of the light diffusing particles 102b in the substrate 102a or to enhance the functionality of the light diffusing particles 102b, such as toughness. When the light diffusing particles 102b are surface-modified, the surface of the light diffusing particles 102b is modified with at least one of an inorganic cation, an inorganic anion, a polymer, a coupling agent, or a surfactant, i.e., the surface of the light diffusing particles 102b includes at least one of an inorganic cation group, an inorganic anion group, a polymer group, a coupling agent group, or a surfactant group.

[0071] In some embodiments, the surface of the light diffusing particles 102b is modified with at least one of inorganic magnesium salts, inorganic calcium salts, inorganic barium salts, inorganic strontium salts, stearic acid, stearates, sulfonic acid surfactants, thio surfactants, titanates, aluminates, polyacrylamides, silanes, alkyl phosphates, aryl phosphates, alkyl phosphates, aryl phosphates, alkyl alcohol amide phosphates, alkyl alcohol amide phosphates, imidazoline type phosphates, imidazoline type phosphates, high polyphosphates, high polyphosphates, and siloxane phosphates.

[0072] Specifically, the surface of the light diffusion particle 102b is modified by at least one selected from magnesium chloride, calcium chloride, barium chloride, strontium chloride, stearic acid, sodium stearate, zinc stearate, sulfonic acid surfactant, thio surfactant, titanate ester, aluminate ester, polyacrylamide, silane, alkyl phosphate, aryl phosphate, alkyl phosphate, aryl phosphate, alkyl alcohol amide phosphate, imidazoline phosphate, imidazoline phosphate, high polyphosphate, high polyphosphate, and siloxane phosphate.Preferably, the surface of the light diffusion particle 102b is modified by at least one of sulfonic acid surfactant or thio surfactant. The sulfonic acid surfactant may be selected from at least one of alkyl sulfonate and fluoroalkyl sulfonate, specifically at least one of sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, and sodium fluorododecyl sulfonate, and the thio surfactant may be selected from at least one of mercaptan and fluoromercaptan, specifically at least one of octanethiol, dodecanethiol, tetradecanethiol, octadecanethiol, fluorooctanethiol, and fluorododecanethiol. When the sulfonic acid surfactant is mixed with the light diffusion particles to be surface-modified, the sulfonic acid surfactant forms a sulfonic acid shell layer, such as a benzene ring sulfonic acid shell layer, on the surface of the whisker, which is advantageous for protecting the light diffusion particles, increasing the toughness of the light diffusion particles 102b, and reducing the breakage of the light diffusion particles 102b in the first optical functional layer 102.When a thio-based surfactant group is mixed with the light-diffusing particles to be surface-modified, the thio-based surfactant group and the hydroxyl group on the whisker surface will form an OSO cross-linked network, and the binding energy of OSO is relatively large, which is advantageous for protecting the light-diffusing particles 102b, reducing damage to the light-diffusing particles 102b, and improving the effect of improving the optical functions such as contrast and brightness provided by the light-diffusing particles 102b during the process of mixing the light-diffusing particles 102b with the material of the substrate 102a to form the first optical functional layer 102. More preferably, the light-diffusing particles 102b are modified with at least one of a sulfonic acid surfactant having a fluorine substituent and a thio surfactant having a fluorine substituent, specifically at least one of sodium fluorododecylsulfonate, fluorooctanethiol, and fluorododecanethiol, in which fluorine atoms are highly stable in alkyl chains, the bond energy of carbon-fluorine bonds is higher than that of carbon-carbon bonds, and carbon-fluorine bonds have the effect of shielding carbon-carbon bonds and are advantageous in protecting carbon-carbon bonds, thereby improving the stability of the light-diffusing particles 102b.

[0073] In some embodiments, the absolute value of the difference in refractive index between the substrate 102a and the light diffusing particles 102b is greater than or equal to 0.02, for example, 0.03, 0.05, 0.09, 0.1, 0.15, 0.2, etc., thereby realizing the light diffusing function of the light diffusing particles 102b.

[0074] In some embodiments, the glass transition temperature of the substrate 102a may be between 30° C. and 500° C., such as 40° C., 50° C., 100° C., 150° C., 200° C., 250° C., 300° C., 350° C., 400° C., 450° C., etc. The elastic modulus of the substrate 102a at 23° C. may be between 500 MPa and 5000 MPa, such as 600 MPa, 700 MPa, 800 MPa, 900 MPa, 1000 MPa, 1200 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2200 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3200 MPa, 3500 MPa, 3800 MPa, 4000 MPa, 4200 MPa, 4500 MPa, 4800 MPa, etc.

[0075] In some embodiments, the elastic modulus of the substrate 102a is obtainable at a humidity of 50%.

[0076] In some embodiments, the thickness of the first optical functional layer 102 is 15 microns or more, and the thickness of the first optical functional layer 102 is 150 microns or less, for example, 20 microns, 25 microns, 30 microns, 40 microns, 50 microns, 60 microns, 80 microns, 100 microns, 120 microns, 130 microns, 140 microns, etc., which makes it easier to process the first optical functional layer 102 and helps maintain appropriate light transmittance of the first optical functional layer 102.

[0077] In some embodiments, the first optical functional layer 102 further includes a plasticizer dispersed in the base material 102a, and the plasticizer may be selected from at least one of a phosphate ester plasticizer, a citrate ester plasticizer, and a fatty acid ester plasticizer. In the first optical functional layer 102, the mass fraction of the plasticizer is 4% or more and 6% or less, and may be, for example, 5%.

[0078] In some embodiments, the first optical functional layer 102 further includes an ultraviolet absorber dispersed in the substrate 102a, and the ultraviolet absorber may be selected from at least one of a benzophenone-based ultraviolet absorber and a benzotriazole-based ultraviolet absorber, and the mass fraction of the ultraviolet absorber is greater than or equal to 0.8% and less than or equal to 1.2%, for example, may be 1%.

[0079] 1 to 5, in some embodiments, the polarizer 100 further includes a second optically functional layer 103 located on at least one side of the substrate 102a.

[0080] Here, the second optical functional layer 103 is located between the polarizing layer 101 and the first optical functional layer 102, or the second optical functional layer 103 is located on the side of the first optical functional layer 102 away from the polarizing layer 101.

[0081] In some embodiments, the second optical functional layer 103 is located on the side of the first optical functional layer 102 away from the polarizing layer 101, and the polarizer 100 further includes a first adhesive layer 104 arranged on the first optical functional layer 102 adjacent to the polarizing layer 101.

[0082] Here, the first adhesive layer 104 is in direct contact with the polarizing layer 101, or the polarizer 100 further includes a protective layer 105 located between the first optical functional layer 102 and the polarizing layer 101, and the first adhesive layer 104 is in direct contact with the protective layer 105.

[0083] In some embodiments, the first adhesive layer 104 is in direct contact with the first optical functional layer 102, the first adhesive layer 104 is in direct contact with the polarizing layer 101, or the first adhesive layer 104 is in direct contact with the first optical functional layer 102 and the first adhesive layer 104 is in direct contact with the protective layer 105.

[0084] In some embodiments, the first adhesive layer 104 may be selected from at least one of a water-based adhesive, a pressure-sensitive adhesive, and a UV adhesive, where the water-based adhesive material may be selected from polyvinyl alcohol, the pressure-sensitive adhesive material may be selected from an acrylate copolymer, and the UV adhesive material may be selected from a multifunctional acrylate monomer.

[0085] 1 to 5, in some embodiments, the second optical functional layer 103 includes at least one of an anti-glare sub-layer 106, a transparent hardened sub-layer 107, a low-reflection sub-layer 108, an anti-reflection sub-layer, an anti-fingerprint sub-layer, and an anti-static sub-layer. When the second optical functional layer 103 is a low-reflection sub-layer 108, the low-reflection sub-layer 108 may be formed by stacking a transparent hardened sub-portion 108a and a low refractive index sub-portion 108b.

[0086] In some embodiments, the polarizing layer 101 is composed of polyvinyl alcohol and a dye.

[0087] In some embodiments, the polarizer 100 further includes a release layer 109 located on a side of the polarizing layer 101 away from the first optically functional layer 102, and the release layer 109 and the polarizing layer 101 are bonded via a second adhesive layer 110. When the polarizer 100 is used in the display device, the release layer 109 is removed to expose the second adhesive layer 110, and the polarizer 100 is attached to a display panel via the second adhesive layer 110.

[0088] In some embodiments, the polarizer 100 further includes a compensation layer 111 located between the second adhesive layer 110 and the polarizing layer 101 .

[0089] In an embodiment of the present invention, by disposing light diffusing particles 102b in the first optical functional layer 102 of the polarizer 100, the chromaticity viewing angle of a display device using this polarizer 100 is improved, eliminating the need to add a film layer to the polarizer 100, reducing the loss of output light from the display device, and improving the contrast of the display device.

[0090] Referring to FIG. 8, an embodiment of the present invention further provides a display device 10 including the above-described polarizer 100.

[0091] Specifically, the display device includes a display panel 200 and a first polarizer 300. The first polarizer 300 is disposed on the light-emitting side of the display panel 200, and the first polarizer 300 is selected from the above-described polarizers 100.

[0092] In some embodiments, the display panel 200 may be a liquid crystal display panel, a self-emitting display panel, etc. The self-emitting display panel may be an OLED (Organic Light-Emitting Diode) display panel, etc.

[0093] In some embodiments, the first optical function layer of the first polarizer 300 is disposed on the side of the polarizing layer of the first polarizer 300 away from the display panel.

[0094] When the display panel 200 is a liquid crystal display panel, the display device 10 further includes a backlight module 400 disposed on the side of the display panel 200 away from the first polarizer 300. The backlight module 400 is used to provide a light source for the display panel 200. The display device 10 further includes a second polarizer 500 located between the backlight module 400 and the display panel 200. The second polarizer 500 may be selected from the above-described polarizers 100, or the second polarizer 500 may not be selected from the above-described polarizers 100.

[0095] Next, the present invention will be described in more detail with reference to some embodiments. However, it should be noted that these examples are provided for illustrative purposes only and should in no way be construed as limiting the present invention.

[0096] Example 1 The master batch cellulose triacetate powder (refractive index 1.50) is dissolved in a solvent, and the plasticizer triphenyl phosphate is added at 5% of the total solid mass, and the 2-(2-hydroxy-5-methylphenyl)benzotriazole-based ultraviolet absorber is added at 1% of the total solid mass. After uniform mixing, rod-shaped calcium sulfate light-diffusing particles, needle-shaped calcium sulfate light-diffusing particles with a reduced diameter at one end, and needle-shaped calcium sulfate light-diffusing particles with a reduced diameter at both ends are added, where the mass fractions of the three in the light-diffusing particles are 5%, 45%, and 50%, respectively. The refractive index of the light-diffusing particles in the master batch obtained after mixing the three is 1.59, the major axis is 10-30 μm, the diameter is 0.5-2 μm, and all three light-diffusing particles are surface-modified, and the surface modifier is stearic acid. The amount of light-diffusing particles added is 5% of the total solid mass, and a uniform mother liquid is formed by stirring. After filtering the mother liquor, the monolayer is extruded onto a steel belt by an extruder and dried to form a film. The film is peeled off from the steel belt and then stretched longitudinally (in a first direction) to orient the light-diffusing particles and cellulose triacetate to form a substrate and light-diffusing particles dispersed in the substrate, thereby forming a first optical functional layer, the thickness of which is 40 μm, a second optical functional layer, which is a transparent cured sub-layer, is applied to one side of the first optical functional layer, and a pressure-sensitive adhesive is applied to the other side as a first adhesive layer, which is then laminated with a pre-polarizer (formed by laminating a peeling layer, a second adhesive layer, a compensation layer, a polarizing layer, and a protective layer) by roll-to-roll bonding to obtain a polarizer, the structure of which is as shown in FIG. 1.

[0097] Example 2 The masterbatch polyethylene terephthalate (refractive index 1.62) pellets are dissolved in a solvent, and 5% of the total solid mass of 2-(2-hydroxy-5-methylphenyl)benzotriazole-based ultraviolet absorber is added. After uniform mixing, rod-shaped calcium carbonate light-diffusing particles, needle-shaped calcium carbonate light-diffusing particles with a reduced diameter at one end, and needle-shaped calcium carbonate light-diffusing particles with a reduced diameter at both ends are added, where the mass fractions of the three in the light-diffusing particles are 5%, 45%, and 50%, respectively. After mixing the three, the light-diffusing particles in the masterbatch have a refractive index of 1.67, a major axis of 10-30 μm, and a diameter of 0.5-2 μm. All three light-diffusing particles are surface-modified, and the surface modifier is fluoromercaptan. The amount of light-diffusing particles added is 2.5% of the total solid mass. After uniformly mixing in a screw extruder, a cast sheet is formed into a film, and the film is stretched longitudinally (first direction) and then transversely (second direction) to orient the light-diffusing particles and polyethylene terephthalate to form a substrate and light-diffusing particles dispersed in the substrate. The thin film formed at this time is the first optical functional layer, and the thickness of the first optical functional layer is 80 μm. A second optical functional layer, which is an antiglare sub-layer, is applied to one side, and a pressure-sensitive adhesive is applied to the other side as a first adhesive layer. The pre-polarizer (formed by laminating a release layer, a second adhesive layer, a compensation layer, a polarizing layer, and a protective layer) is laminated by roll-to-roll to form a polarizer. The structure of this polarizer is as shown in Figure 2.

[0098] Example 3 The obtained first optical functional layer is subjected to an alkali treatment, and then directly bonded to the polarizing layer (i.e., the protective layer is omitted from the pre-polarizer) using an aqueous adhesive as the first adhesive layer, which is the same or similar to Example 1. The structure of the obtained polarizer is as shown in Figure 3.

[0099] Example 4 The second optical functional layer is a low-reflection sublayer, and the low-reflection sublayer is formed by laminating a transparent cured subsection and a low refractive index subsection, except that the structure of the obtained polarizer is the same as or similar to that of Example 1, and is as shown in FIG.

[0100] Example 5 Except for the fact that the master batch was polymethyl methacrylate (refractive index 1.50), the amount of light diffusing particles added was 5% of the total solid mass, and the thickness of the first optical functional layer formed after longitudinal stretching and transverse stretching was 40 μm, the structure of the obtained polarizer was as shown in Figure 2.

[0101] Example 6 This is the same as or similar to Example 2, except that the first optical functional layer is directly bonded to the polarizing layer (i.e., the protective layer is omitted from the pre-polarizer) using an ultraviolet adhesive as the first adhesive layer, and the structure of the obtained polarizer is as shown in Figure 5.

[0102] Comparative Example 1 Rod-shaped calcium carbonate light-diffusing particles, needle-shaped calcium carbonate light-diffusing particles with a diameter reduced at one end, and needle-shaped calcium carbonate light-diffusing particles with a diameter reduced at both ends are added to a pressure-sensitive adhesive, where the mass fractions of the three in the light-diffusing particles are 5%, 45%, and 50% respectively, and the refractive index of the light-diffusing particles after mixing the three is 1.67, the major axis is 10-30 μm, and the diameter is 0.5-2 μm. All three light-diffusing particles are surface-modified, and the surface modifier is stearic acid. The amount of the light-diffusing particles added is 10% of the total solid mass. A substrate 112 (made of polyethylene terephthalate) having a low-reflection coating on one side is coated on the other side by a coating method to obtain a light-diffusing adhesive layer 113 (the thickness of the light-diffusing adhesive layer is 20 μm). After drying, the substrate 112 is roll-to-roll laminated on the surface of a protective layer (made of polyethylene terephthalate) to obtain a polarizer. The structure of the obtained polarizer is as shown in FIG. 6.

[0103] Comparative Example 2 Except that the light-diffusing particles are spherical, the comparative optical functional layer 114 is obtained, and the structure of the obtained polarizer is as shown in FIG.

[0104] The first optical functional layers obtained in Examples 1 to 6, the light diffusing adhesive layer obtained in Comparative Example 1, and the comparative optical functional layer obtained in Comparative Example 2 were photographed using an optical microscope (Olympus MX63L, magnification: 500x (10x50)), and the absolute average value of the orientation angle of the light diffusing particles in each first optical functional layer, light diffusing adhesive layer, and comparative optical functional layer relative to the absorption axis of the polarizing layer was calculated using the Image J program.

[0105] The polarizers obtained in Examples 1 to 6, Comparative Example 1, and Comparative Example 2 were each placed on the light output side of a liquid crystal display module of the same model (same liquid crystal display panel, same backlight module, and polarizer of the same structure between the liquid crystal display panel and the backlight module), and the contrast and chromaticity viewing angle of the display device were determined using a spectrum analyzer CS2000A manufactured by Konica Minolta Japan. [Table 1]

[0106] As can be seen from the results in Table 1, in comparison with the light diffusion adhesive layer obtained by forming in a pressure-sensitive adhesive, in Examples 1 to 6, the light diffusion particles are dispersed in the substrate, and the light diffusion particles are at least longitudinally stretched with the formation of the substrate, so that the obtained first optical functional layer is applied to a polarizer, and then effectively improves the contrast and chromaticity viewing angle of the display device using this polarizer. In addition, in comparison with the comparative optical functional layer using spherical light diffusion particles, in Examples 1 to 6, a mixture of rod-shaped light diffusion particles, needle-shaped light diffusion particles with a reduced diameter at one end, and needle-shaped light diffusion particles with a reduced diameter at both ends is used, so that the absolute value of the average value of the orientation angle of the major axis of the light diffusion particles with respect to the absorption axis of the polarizing layer is 3.5° or less, and the improvement of the chromaticity viewing angle is even more obvious.

[0107] An embodiment of the present invention discloses a polarizer and a display device, the polarizer including a polarizing layer and a first optical functional layer located on one side of the polarizing layer, the first optical functional layer including a substrate and light diffusing particles dispersed in the substrate, the substrate having a glass transition temperature of 30°C to 500°C, the substrate having an elastic modulus of 500MPa to 5000MPa at 23°C, and an absolute value of an average value of a difference between an orientation angle of a major axis of the light diffusing particles in an orthogonal projection on a first plane and an orientation angle of an absorption axis of the polarizing layer in an orthogonal projection on the first plane is 5° or less, the present invention improves the chromaticity viewing angle of a display device using the polarizer by disposing light diffusing particles in the first optical functional layer of the polarizer, so that there is no need to add a film layer to the polarizer, the loss of light emitted from the display device is reduced, and the contrast of the display device is improved.

[0108] It is understood that a person skilled in the art may make equivalent substitutions or modifications based on the technical solutions and inventive concepts of the present application, and all such modifications or substitutions should fall within the scope of protection of the appended claims of the present application.

Claims

1. A polarizer comprising: A polarizing layer; a first optical functional layer located on one surface of the polarizing layer, the first optical functional layer including a substrate and light diffusing particles dispersed in the substrate; wherein the glass transition temperature of the substrate is 30° C. to 500° C., and the elastic modulus of the substrate is 500 MPa to 5000 MPa at 23° C.; The orthogonal projection of the long axis of the light diffusing particle on a first plane has a first orientation angle, the orthogonal projection of the absorption axis of the polarizing layer on the first plane has a second orientation angle, the average value of the difference between the first orientation angle and the second orientation angle is 5° or less, and the first plane is parallel to a plane in which the polarizing layer is located. A polarizer characterized by:

2. There is an included angle between the major axis of the light diffusing particle and the first plane, the included angle is an acute angle, and the included angle is less than or equal to 40°.

2. The polarizer according to claim 1 .

3. the light diffusing particles are selected from at least one of a first type of light diffusing particles, a second type of light diffusing particles, a third type of light diffusing particles, a fourth type of light diffusing particles, and a fifth type of light diffusing particles; wherein the variation in diameter of the first type of light diffusing particle along the extension direction of the long axis of the first type of light diffusing particle is 0.3 microns or less; Along the extension direction of the long axis of the second type light diffusing particle, the diameter of the central portion of the second type light diffusing particle varies by 1 micron or less, along the direction away from the central portion of the second type light diffusing particle, the diameter of the first end of the second type light diffusing particle gradually decreases, and the diameter of the second end of the second type light diffusing particle varies by 1 micron or less; Along the extension direction of the long axis of the third type light diffusing particle, the change value of the diameter of the central portion of the third type light diffusing particle is 1 micron or less, along the direction away from the central portion of the third type light diffusing particle, the diameter of the first end of the third type light diffusing particle gradually decreases, and the diameter of the second end of the third type light diffusing particle gradually decreases; a first end of the fourth type light diffusing particle is connected to a second end of the fourth type light diffusing particle in sequence, and a diameter of the fourth type light diffusing particle gradually decreases along a direction from the first end of the fourth type light diffusing particle to the second end of the fourth type light diffusing particle; The first end of the fifth type light diffusing particle is connected to the second end of the fifth type light diffusing particle in sequence, and the diameter of the first end of the fifth type light diffusing particle gradually decreases along a direction away from the second end of the fifth type light diffusing particle, and the diameter of the second end of the fifth type light diffusing particle gradually decreases along a direction away from the first end of the fifth type light diffusing particle.

3. The polarizer according to claim 2 .

4. The first type of light diffusing particles are rod-shaped particles, the second type of light diffusing particles are needle-shaped particles with a diameter reduced at one end, the third type of light diffusing particles are needle-shaped particles with a diameter reduced at both ends, the fourth type of light diffusing particles are cone-shaped particles, and the fifth type of light diffusing particles are bicone-shaped particles. The polarizer according to claim 3 .

5. The light diffusing particles are selected from at least two of the first type of light diffusing particles, the second type of light diffusing particles, the third type of light diffusing particles, the fourth type of light diffusing particles, and the fifth type of light diffusing particles. The polarizer according to claim 3 .

6. The light diffusing particles are selected from a first type of light diffusing particles, a second type of light diffusing particles, and a third type of light diffusing particles. The polarizer according to claim 5 .

7. The light diffusing particles are selected from the first type of light diffusing particles, the fourth type of light diffusing particles, and the fifth type of light diffusing particles. The polarizer according to claim 5 .

8. The light diffusing particles are selected from the first type of light diffusing particles, the second type of light diffusing particles, the third type of light diffusing particles, the fourth type of light diffusing particles, and the fifth type of light diffusing particles. The polarizer according to claim 5 .

9. The mass fraction of the first type of light diffusing particles in the light diffusing particles is 1% to 8%, the mass fraction of the second type of light diffusing particles and the fourth type of light diffusing particles in the light diffusing particles is 40% to 50%, and the mass fraction of the third type of light diffusing particles and the fifth type of light diffusing particles in the light diffusing particles is 45% to 55%. The polarizer according to claim 8 .

10. The material of the substrate is selected from at least one of cellulose triacetate, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polycycloolefin, and polyethylene naphthalate.

2. The polarizer according to claim 1 .

11. the substrate material is selected from cellulose triacetate; Here, the average value of the difference between the first orientation angle and the second orientation angle is 2.3° or less. The polarizer according to claim 10 .

12. the material of the substrate is selected from polyethylene terephthalate or polymethyl methacrylate; Here, the average value of the difference between the first orientation angle and the second orientation angle is 3.5° or less. The polarizer according to claim 10 .

13. The ratio of the major axis of the light diffusing particle to the diameter of the light diffusing particle is 1 or more, and the ratio of the major axis of the light diffusing particle to the diameter of the light diffusing particle is 100 or less.

2. The polarizer according to claim 1 .

14. The major axis of the light diffusing particle is 5 microns or more, and the major axis of the light diffusing particle is 50 microns or less. The polarizer according to claim 13 .

15. The surface of the light diffusing particle comprises at least one of an inorganic cationic group, an inorganic anionic group, a polymer group, a coupling agent group, or a surfactant group.

2. The polarizer according to claim 1 .

16. The mass fraction of the light diffusing particles in the first optical functional layer is 3% or more, and the mass fraction of the light diffusing particles in the first optical functional layer is 30% or less.

2. The polarizer according to claim 1 .

17. The absolute value of the difference in refractive index between the substrate and the light diffusing particles is 0.02 or more.

2. The polarizer according to claim 1 .

18. The polarizer further includes a second optically functional layer located on at least one side of the substrate, the second optically functional layer including at least one of an antiglare sublayer, a transparent cured sublayer, a low-reflection sublayer, an anti-reflection sublayer, an anti-fingerprint sublayer, and an antistatic sublayer; Here, the second optical functional layer is located between the polarizing layer and the first optical functional layer, or The second optical functional layer is located on a side of the first optical functional layer that is away from the polarizing layer.

2. The polarizer according to claim 1 .

19. The thickness of the first optical functional layer is 15 microns or more, and the thickness of the first optical functional layer is 150 microns or less.

2. The polarizer according to claim 1 .

20. A display device comprising a polarizer, the polarizer comprising: A polarizing layer; a first optical functional layer located on one surface of the polarizing layer, the first optical functional layer including a substrate and light diffusing particles dispersed in the substrate; wherein the glass transition temperature of the substrate is 30° C. to 500° C., and the elastic modulus of the substrate is 500 MPa to 5000 MPa at 23° C.; The orthogonal projection of the long axis of the light diffusing particle on a first plane has a first orientation angle, the orthogonal projection of the absorption axis of the polarizing layer on the first plane has a second orientation angle, the average value of the difference between the first orientation angle and the second orientation angle is 5° or less, and the first plane is parallel to a plane in which the polarizing layer is located. A display device comprising:

Images