Optical film and display module

1. An optical film applicable to a display module, wherein the optical film comprises:

a light-guiding layer, having a light incident surface, a light-emitting surface facing away from the light incident surface, and at least one accommodating recessed portion formed on the light incident surface, wherein the accommodating recessed portion has an inner wall surface and an opening;

at least one light-guiding member, wherein each light-guiding member is disposed on each accommodating recessed portion respectively, and each light-guiding member has a top portion, a bottom portion away from the top portion, and a side surface connecting the top portion and the bottom portion, in which the side surface of the light-guiding member faces the inner wall surface of the accommodating recessed portion, and the bottom portion of the light-guiding member corresponds to the opening of the accommodating recessed portion; and

at least one light absorption member, wherein the at least one light absorption member is disposed between the side surface of the at least one light-guiding member and the light-guiding layer, and the light absorption member covers the side surface, wherein

the light-guiding layer has a fourth refractive index, each light-guiding member has a fifth refractive index, and the fourth refractive index is greater than the fifth refractive index.

2. The optical film according to claim 1 , wherein the at least one light absorption member has a sixth refractive index, and the sixth refractive index is equal to the fourth refractive index.

3. The optical film according to claim 1 , wherein the at least one light absorption member has a sixth refractive index, and the sixth refractive index is not greater than the fourth refractive index, and is not less than the fifth refractive index.

4. The optical film according to claim 1 , wherein the light-guiding layer has at least two accommodating recessed portions, and the light incident surface has at least one connection zone located between every two adjacent recessed portion openings, and wherein the light absorption member further covers the connection zone.

5. The optical film according to claim 1 , wherein the at least one light absorption member has a maximum thickness T, and the maximum thickness satisfies the following relationship:

0

<

T

<

H

tan

⁡

(

90

⁢

°

-

sin

-

1

⁡

(

sin

⁢

⁢

θ

i

⁢

⁢

n

×

n

i

⁢

⁢

n

n

4

)

)

-

H

tan

⁢

⁢

φ

;

wherein H is a distance between the top portion and the bottom portion of the light-guiding member, n 4 is the fourth refractive index, n in is a refractive index of a medium where a light is located before the light is incident to the light-guiding layer at the light incident surface at an incident angle θ in , and φ is an angle between a tangent of the side surface and the bottom portion.

6. An optical film applicable to a display module, wherein the optical film comprises:

a first light-guiding layer having a first light incident surface, a first light-emitting surface facing away from the first light incident surface, and at least one accommodating recessed portion formed on the first light incident surface, wherein the accommodating recessed portion has an inner wall surface and an opening;

a second light-guiding layer disposed on the first light incident surface, wherein the second light-guiding layer has a second light incident surface, a second light-emitting surface facing away from the second light incident surface, and at least one light-guiding member formed on the second light-emitting surface, wherein each light-guiding member is disposed on each accommodating recessed portion respectively, and each light-guiding member has a top portion, a bottom portion away from the top portion, and a side surface connecting the top portion and the bottom portion, and wherein the side surface of the light-guiding member faces the inner wall surface of the accommodating recessed portion, and the bottom portion of the light-guiding member corresponds to the opening of the accommodating recessed portion; and

at least one light absorption member, wherein the at least one light absorption member is disposed between the side surface of the at least one light-guiding member and the first light-guiding layer, and the light absorption member covers the side surface, wherein

the first light-guiding layer has a first refractive index, the second light-guiding layer has a second refractive index, and the first refractive index is greater than the second refractive index.

7. The optical film according to claim 6 , wherein the at least one light absorption member has a third refractive index, and the third refractive index is equal to the first refractive index.

8. The optical film according to claim 7 , wherein the at least one light absorption member has a third refractive index, and the third refractive index is not greater than the first refractive index, and is not less than the second refractive index.

9. The optical film according to claim 7 , wherein the first light-guiding layer has at least two accommodating recessed portions, and the first light incident surface has at least one connection zone disposed between every two adjacent openings, and wherein the light absorption member further covers the connection zone.

10. The optical film according to claim 7 , wherein the at least one light absorption member has a maximum thickness T, and the maximum thickness satisfies the following relationship:

0

<

T

<

H

tan

⁡

(

90

⁢

°

-

sin

-

1

⁡

(

sin

⁢

⁢

θ

2

×

n

2

n

1

)

)

-

H

tan

⁢

⁢

φ

;

wherein H is a distance between the top portion and the bottom portion of the light-guiding member, n 1 is the first refractive index, n 2 is the second refractive index, θ 2 is an incident angle at which a light is incident to the first light-guiding layer at the second light-guiding layer, and φ is an angle between a tangent of the side surface and the bottom portion.