阅读说明：本技术 量子点偏光片以及显示设备 (Quantum dot polaroid and display device ) 是由 马卜 邢泽咏 李敬群 王允军 于 2019-03-08 设计创作，主要内容包括：本发明公开了一种量子点偏光片及显示设备,量子点偏光片包括：偏光片；具有量子点层的量子点膜,量子点层包括量子点、第一光扩散粒子和高分子材料,量子点和第一光扩散粒子分散在高分子材料中,偏光片承载量子点膜。该量子点偏光片中的量子点层包括第一光扩散粒子,第一扩散粒子对光线具有散射的功能,能够提升量子点偏光片的出光效率,从而达到提升量子点偏光片亮度的效果。该显示设备包括量子点偏光片。(The invention discloses a quantum dot polaroid and display equipment, wherein the quantum dot polaroid comprises: a polarizer; the quantum dot film comprises a quantum dot layer, a first light diffusion particle and a high polymer material, wherein the quantum dot layer comprises a quantum dot, the first light diffusion particle and the high polymer material, the quantum dot and the first light diffusion particle are dispersed in the high polymer material, and the polaroid bears the quantum dot film. The quantum dot layer in the quantum dot polaroid comprises first light diffusion particles, the first diffusion particles have a scattering function on light, the light emitting efficiency of the quantum dot polaroid can be improved, and therefore the effect of improving the brightness of the quantum dot polaroid is achieved. The display device includes a quantum dot polarizer.)

1. A quantum dot polarizer, comprising:

a polarizer;

the quantum dot film comprises a quantum dot layer, a first light diffusion particle and a high polymer material, wherein the quantum dot layer comprises a quantum dot, the first light diffusion particle and the high polymer material, the quantum dot and the first light diffusion particle are dispersed in the high polymer material, and the polarizer bears the quantum dot film.

2. The quantum dot polarizer of claim 1, wherein the mass fraction of the first light diffuser in the quantum dot layer is in the range of 0.1 wt% to 15.0 wt%.

3. The quantum dot polarizer according to claim 1 or 2, wherein the first light diffusing particles comprise inorganic light diffusing particles and organic light diffusing particles;

the inorganic light-diffusing particles are selected from SiO₂Particles, TiO₂Particles, Al₂O₃Particles, BaSO₄At least one of particles;

the organic light diffusion particles are selected from at least one of polymethyl methacrylate particles, polycarbonate particles, polystyrene particles, polyethylene particles, polypropylene particles or silicon rubber particles;

preferably, the mass fraction of the inorganic light diffusion particles in the quantum dot layer ranges from 0.1 wt% to 3.0 wt%, and the mass fraction of the organic light diffusion particles in the quantum dot layer ranges from 1.0 wt% to 10.0 wt%.

4. The quantum dot polarizer of claim 3, wherein the inorganic light diffusion particles have a particle size ranging from 50 nm to 1 μm, and the organic light diffusion particles have a particle size ranging from 500 nm to 5 μm.

5. A quantum dot polarizer according to any of claims 1 to 4, wherein the quantum dot film comprises a plurality of layered structures, wherein at least one layer is the quantum dot layer;

preferably, the quantum dot film comprises an odd number of layered structures.

6. The quantum dot polarizer of claim 5, wherein the quantum dot film further comprises a light diffusion layer comprising second light diffusing particles and a polymer, the second light diffusing particles being dispersed in the polymer.

7. The quantum dot polarizer of claim 6, wherein the second light diffusing particles comprise inorganic light diffusing particles and organic light diffusing particles;

preferably, the second light diffusion particles have an average particle diameter larger than that of the first light diffusion particles.

8. The quantum dot polarizer of claim 1, wherein the quantum dot layer comprises a crystalline region in which polymer chains are regularly arranged and an amorphous region in which polymer chains are randomly arranged, and the crystalline region is dispersed with quantum dots.

9. The quantum dot polarizer of claim 8, wherein the crystallinity of the polymer material is 25% to 40%;

preferably, the crystallinity of the polymer material is 30% to 35%.

10. A display device, comprising: a backlight module to emit a backlight;

a liquid crystal cell;

the quantum dot polaroid is arranged between the backlight module and the liquid crystal box; wherein the content of the first and second substances,

the quantum dot polaroid comprises a polaroid and a quantum dot film with a quantum dot layer, and the polaroid bears the quantum dot film;

the quantum dot layer comprises quantum dots, light diffusion particles and a high polymer material, wherein the quantum dots and the light diffusion particles are dispersed in the high polymer material.

Technical Field

The application relates to a quantum dot polaroid and display equipment.

Background

Quantum dots have excellent optical properties, and are now widely used in the fields of display, illumination, and the like. At present, quantum dots are mainly dispersed in a high molecular material to prepare a corresponding quantum dot film, and then an excitation light source is used for exciting the quantum dot film to emit light.

However, the light extraction rate of the conventional quantum dot film is not high, and the brightness of a display device, an illumination device and the like is difficult to improve.

Disclosure of Invention

To solve the above technical problem, the present application provides a quantum dot polarizer having an improvement in brightness.

One aspect discloses a quantum dot polarizer, comprising: a polarizer; the quantum dot film comprises a quantum dot layer, a first light diffusion particle and a high polymer material, wherein the quantum dot layer comprises a quantum dot, the first light diffusion particle and the high polymer material, the quantum dot and the first light diffusion particle are dispersed in the high polymer material, and the polaroid bears the quantum dot film.

The quantum dot layer in the quantum dot polaroid comprises first light diffusion particles, the first diffusion particles have a scattering function on light, the light emitting efficiency of the quantum dot polaroid can be improved, and therefore the effect of improving the brightness of the quantum dot polaroid is achieved.

In one embodiment, the mass fraction of the first light diffusing agent in the quantum dot layer ranges from 0.1 wt% to 15.0 wt%.

The inventors found that when the mass fraction of the first light diffusion particles is in the above range, the brightness of the quantum dot polarizer is significantly improved.

In one embodiment, the first light diffusing particles include inorganic light diffusing particles and organic light diffusing particles; the inorganic light-diffusing particles are selected from SiO₂Particles, TiO₂Particles, Al₂O₃Particles, BaSO₄At least one of particles; the organic light diffusion particles are selected from at least one of polymethyl methacrylate particles, polycarbonate particles, polystyrene particles, polyethylene particles, polypropylene particles or silicon rubber particles.

When the inorganic light diffusion particles and the organic light diffusion particles have certain difference in optical properties such as refractive index and the like, and the inorganic light diffusion particles and the organic light diffusion particles are compounded to form the first light diffusion particles, the optical properties of the two different types of light diffusion particles can be complemented, the improvement of the light emitting efficiency of the quantum dot polaroid is facilitated, and the improvement effect on the brightness of the quantum dot polaroid is further achieved.

Preferably, the mass fraction of the inorganic light diffusion particles in the quantum dot layer ranges from 0.1 wt% to 3.0 wt%, and the mass fraction of the organic light diffusion particles in the quantum dot layer ranges from 1.0 wt% to 10.0 wt%.

The inventors found that when the mass fractions of the inorganic light-diffusing particles and the organic light-diffusing particles in the quantum dot layer are in the above ranges, the light extraction efficiency of the quantum dot polarizer is at the highest level.

In one embodiment, the inorganic light-diffusing particles have a particle size ranging from 50 nm to 1 micron, and the organic light-diffusing particles have a particle size ranging from 500 nm to 5 microns.

The inventors found that, since the inorganic light-diffusing particles and the organic light-diffusing particles have different optical properties, when the particle diameters of the inorganic light-diffusing particles and the organic light-diffusing particles are within the above range, the light extraction efficiency of the quantum dot polarizer is at the highest level.

In one embodiment, the quantum dot film comprises a plurality of layered structures, wherein at least one layer is a quantum dot layer.

Preferably, the quantum dot film comprises an odd number of layered structures.

In one embodiment, the quantum dot film further comprises a light diffusion layer comprising second light diffusion particles and a polymer, the second light diffusion particles being dispersed in the polymer.

In one embodiment, the second light diffusing particles include inorganic light diffusing particles and organic light diffusing particles.

Preferably, the second light diffusion particles have an average particle size larger than that of the first light diffusion particles.

In one embodiment, in the quantum dot layer, the polymer material includes a crystalline region in which polymer chains are regularly arranged and an amorphous region in which polymer chains are randomly arranged, and the quantum dots are dispersed in the crystalline region.

According to different arrangement rules of the polymer chains, the polymer material in the crystal region can form corresponding forms, such as single crystals, spherulites, dendrites, fiber crystals, clusters, columnar crystals, extended chain crystals, and the like. That is, in the crystal region, the quantum dots are dispersed among the polymer chains forming the form of single crystals, spherulites, dendrites, fiber crystals, clusters, columnar crystals, or extended chain crystals.

The quantum dots are dispersed among the regularly arranged polymer chains, and the regularly arranged polymer chains have a protection effect on the quantum dots dispersed among the regularly arranged polymer chains, so that the adverse effects of external water, oxygen and the like on the quantum dots are reduced. Therefore, the quantum dots in the quantum dot film are not easily damaged by water, oxygen and the like, so that the quantum dot film has good stability in the environment including water, oxygen and the like. Therefore, the stability of the quantum dot polaroid can be improved.

The high molecular material is selected from polyolefin polymer, polyester acid ester polymer, polyamide polymer, polyimide polymer and their composition. Specifically, the polymer material may be polyethylene, polyvinylidene fluoride, polyvinyl butyral, polyvinyl alcohol, polystyrene, polypropylene, polymethyl acrylate, polymethyl methacrylate, polydecylene formamide, polyhexamethylene sebacamide, polyethylene terephthalate glycol-modified polyethylene terephthalate, polyethylene naphthalate, polycarbonate, cellulose acetate butyrate, carnauba wax, polymethylphenyl silicone, polydimethylsiloxane, or the like.

In one embodiment, the crystallinity of the polymer material is 25% to 40%; preferably, the crystallinity of the polymer material is 30% to 35%.

The inventor finds that the crystallinity of the high molecular material plays a crucial role in the toughness of the quantum dot film; and the crystallinity is a parameter of the regular arrangement degree of the polymer chains, and plays an important role in preventing the quantum dots from being adversely affected by water, oxygen and the like. When the crystallinity of the high polymer material is in the range, the toughness of the quantum dot film adapts to the softness of the polaroid, so that the quantum dot film and the polaroid are more similar in mechanical property, and the combination is more suitable. And when the crystallinity of the polymer material is in the range, the protection of the quantum dots by the polymer chains in the polymer material is in a better balanced state, so that the stability of the quantum dot polarizer is in a better level.

In another aspect, a display apparatus is disclosed, comprising: a backlight module to emit a backlight; a liquid crystal cell; the quantum dot polaroid is arranged between the backlight module and the liquid crystal box; the quantum dot polarizer comprises a polarizer and a quantum dot film with a quantum dot layer, and the quantum dot film is borne by the polarizer; the quantum dot layer comprises quantum dots, light diffusion particles and a high polymer material, wherein the quantum dots and the light diffusion particles are dispersed in the high polymer material.

Drawings

FIG. 1 is a schematic structural diagram of a quantum dot polarizer in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a display device in an embodiment of the present application.

In the drawings like parts are provided with the same reference numerals. The figures show embodiments of the application only schematically.

Detailed Description

The technical solutions in the examples of the present application will be described in detail below with reference to the embodiments of the present application. It should be noted that the described embodiments are only some embodiments of the present application, and not all embodiments.

Quantum dot polarizer