Optical film, polarizer and display device

A polarizer comprising a polarizing layer and an optical film, wherein the polarizing layer is disposed on a side of the optical film, a second surface of the optical film is disposed on a side of a first surface of the optical film away from the polarizing layer;

• wherein the optical film comprises:
• a substrate comprising a dispersion portion, wherein a ratio of a thickness of the dispersion portion to a thickness of the substrate is greater than or equal to 1:100 and less than 1:1;
• and
• regulating particles dispersed in the dispersion portion, wherein the regulating particle comprises:
• first regulating particles, wherein each of the first regulating particles has a plurality of first cross sections, each of the first cross sections has a first circumscribed circle, a ratio of a length of a long axis of each of the first regulating particles to a diameter of the first circumscribed circle with a largest diameter among the first cross sections thereof is greater than or equal to 5 and less than or equal to 50;
• and/or
• second regulating particles, wherein each of the second regulating particles has a plurality of second cross sections, each of the second cross sections has a second circumscribed circle, a ratio of a length of a long axis of each of the second regulating particles to a diameter of the second circumscribed circle with a largest diameter among the second cross sections thereof is greater than or equal to 1 and less than 5.

A display device comprising a polarizer, wherein the polarizer comprises a polarizing layer and an optical film, the polarizing layer is disposed on a side of the optical film, and a second surface of the optical film is disposed on a side of a first surface of the optical film away from the polarizing layer;

• wherein the optical film comprises:
• a substrate comprising a dispersion portion, wherein a ratio of a thickness of the dispersion portion to a thickness of the substrate is greater than or equal to 1:100 and less than 1:1;
• and
• regulating particles dispersed in the dispersion portion, wherein the regulating particle comprises:
• first regulating particles, wherein each of the first regulating particles has a plurality of first cross sections, each of the first cross sections has a first circumscribed circle, a ratio of a length of a long axis of each of the first regulating particles to a diameter of the first circumscribed circle with a largest diameter among the first cross sections thereof is greater than or equal to 5 and less than or equal to 50;
• and/or
• second regulating particles, wherein each of the second regulating particles has a plurality of second cross sections, each of the second cross sections has a second circumscribed circle, a ratio of a length of a long axis of each of the second regulating particles to a diameter of the second circumscribed circle with a largest diameter among the second cross sections thereof is greater than or equal to 1 and less than 5.