Wide-viewing-angle optical film, manufacturing method of the same, and liquid crystal display device

1. A manufacturing method of a wide-viewing-angle optical film, the wide-viewing-angle optical film disposed on a light-emitting side of a liquid crystal display panel, the manufacturing method comprising:

providing a substrate and forming a first light-transmissive layer at one side of the substrate;

performing light treatment to pattern the first light-transmissive layer by using a photomask, so that multiple protrusions are formed on a surface of the first light-transmissive layer, wherein a material of the first light-transmissive layer is a photoresist material, wherein a width of a bottom side of each of the protrusions is W, a distance between any two adjacent protrusions is P, 1<P/W≤10, and a longitudinal cross-section of each of the protrusions is an isosceles trapezoid; and

forming a second light-transmissive layer on one side of the first light-transmissive layer away from the substrate, wherein a refractive index of a material of the second light-transmissive layer is greater than a refractive index of the material of the first light-transmissive layer, so that a wide-viewing-angle film is obtained, the wide-viewing-angle film comprises the first light-transmissive layer and the second light-transmissive layer stacked on each other, and the first light-transmissive layer is disposed on one side of the second light-transmissive layer closer to the liquid crystal display panel.

2. The manufacturing method of the wide-viewing-angle optical film according to claim 1 , wherein the photoresist material of the first light-transmissive layer is a positive photoresist material; and the step of performing the light treatment to pattern the first light-transmissive layer by using the photomask comprises:

providing the photomask, wherein the photomask is a first mask, and the first mask comprises multiple first light-shielding regions arranged at intervals and multiple first light-transmissive regions arranged around the first light-shielding regions;

disposing the first mask between a light source and the first light-transmissive layer, so that light emitted by the light source passes through the first light-transmissive regions and irradiates the first light-transmissive layer; and

developing the first light-transmissive layer, so that a thickness of the first light-transmissive layer is reduced in areas corresponding to the first light-transmissive regions, and the first light-transmissive layer forms the protrusions at positions corresponding to the first light-shielding regions.

3. The manufacturing method of the wide-viewing-angle optical film according to claim 1 , wherein the photoresist material of the first light-transmissive layer is a negative photoresist material; and the step of performing the light treatment to pattern the first light-transmissive layer by using the photomask comprises:

providing the photomask, wherein the photomask is a second mask, and the second mask comprises multiple second light-transmissive regions arranged at intervals and multiple second light-shielding regions arranged around the second light-transmissive regions;

disposing the second mask between a light source and the first light-transmissive layer, so that the light emitted by the light source passes through the second light-transmissive regions and irradiates the first light-transmissive layer; and

developing the first light-transmissive layer, wherein a thickness of the first light-transmissive layer is reduced in areas corresponding to the second light-shielding regions, so that the first light-transmissive layer forms the protrusions at positions corresponding to the second light-transmissive regions.

4. The manufacturing method of the wide-viewing-angle optical film according to claim 1 , wherein before the first light-transmissive layer is disposed at one side of the substrate, the manufacturing method of the wide-viewing angle optical film further comprises:

disposing a polarizing film on the substrate, wherein the polarizing film is arranged between the substrate and the wide-viewing-angle film.

5. The manufacturing method of the wide-viewing-angle optical film according to claim 4 , wherein the polarizing film is formed by coating.

6. The manufacturing method of the wide-viewing-angle optical film according to claim 5 , wherein the step of disposing the polarizing film on the substrate comprises:

coating an alignment material on the substrate and drying the alignment material to obtain an alignment layer;

coating an iodine-containing material on a surface of the alignment layer;

using a solvent to wash the surface of the alignment layer to remove a portion of the iodine-containing material that does not enter the alignment layer; and

drying the alignment layer to form the polarizing film.

7. The manufacturing method of the wide-viewing-angle optical film according to claim 6 , wherein the alignment material is a liquid crystal material, and the iodine-containing material is an iodine solution;

the alignment material is dried by a drying method with drying temperatures of 40° C. to 60° C. and a drying time from 0.1 minute to 10 minutes; and

the alignment layer is dried by the drying method with the drying temperatures of 40° C. to 60° C. and the drying time from 0.1 minute to 10 minutes.

8. A wide-viewing-angle optical film, produced using the manufacturing method of the wide-viewing-angle optical film of claim 1 , wherein the wide-viewing-angle optical film comprises a substrate and a wide-viewing-angle film disposed at one side of the substrate.

9. The wide-viewing-angle optical film according to claim 8 , further comprising a polarizing film arranged on the substrate, wherein the polarizing film is arranged between the substrate and the wide-viewing-angle film.

10. A liquid crystal display device, comprising:

a liquid crystal display panel; and

a wide-viewing-angle optical film arranged on a light-emitting side of the liquid crystal display panel, wherein the wide-viewing-angle optical film is the wide-viewing-angle optical film of claim 1 .

11. The liquid crystal display device according to claim 10 , further comprising a polarizing film arranged on the substrate, wherein the polarizing film is arranged between the substrate and the wide-viewing-angle film.