Display filter, display device and method for forming display filter

1. A display filter disposed on a front surface of a display panel, comprising:

a base portion including a first surface facing the front surface of the display panel and a second surface opposing the first surface, wherein a recess is formed on the first surface;

a first part disposed in the recess and having a first refractive index less than a refractive index of the base portion, the first part having side surfaces contacting the base portion; and

a second part disposed in the recess and having a second refractive index greater than the refractive index of the base portion, the second part having side surfaces contacting the base portion,

wherein a vertical distance between the first surface and the display panel is less than a vertical distance between the second surface and the display panel,

wherein a width of the recess is gradually decreased toward the direction of the second surface of the base portion, and a distance between the second part and the display panel is less than a distance between the first part and the display panel,

wherein light discharged from the lower direction of the display filter is incident on the side surfaces of the first or second parts,

wherein the light incident on the side surfaces of first part is reflected by the side surfaces of the first part and then discharged to the second surface of the base portion, and the light incident on the side surfaces of the second part is absorbed by the side surfaces of the second part, and

wherein a height of the side surfaces of the second part is 0.05 times greater and 0.45 times less than a height of the side surfaces of the first part.

2. The display filter of claim 1 , wherein the first part is disposed in contact with the second part in the recess.

3. The display filter of claim 1 , wherein the first refractive index is 0.82 times greater and 0.99 times less than the refractive index of the base portion.

4. The display filter of claim 1 , wherein the refractive index of the base portion is 0.82 times greater and approximately 0.99 times less than the second refractive index.

5. The display filter of claim 1 , wherein a degree of blackness of the first part is less than a degree of blackness of the second part.

6. The display filter of claim 1 , wherein a width of the first part is less than a width of the second part.

7. The display filter of claim 1 , wherein the first part has a flat top surface, a pointy top, or a curved top surface.

8. The display filter of claim 1 , wherein the first part has a pointy top, and

wherein the side surfaces of the first and second parts form a slanted straight line or a slanted curved line, or a side of the first part forms an obtuse angle with respect to a side of the second part.

9. The display filter of claim 1 ,

wherein the first and second parts form a matrix or wavy configuration.

10. A display device, comprising

a display panel for displaying an image; and

a display filter disposed on a front surface of the display panel,

wherein the display filter comprises:

a base portion including a first surface facing the front surface of the display panel and a second surface opposing the first surface, the base portion being substantially transparent, wherein a recess is formed on the first surface;

a first part disposed in the recess and having a first refractive index less than a refractive index of the base portion, the first part having side surfaces contacting the base portion; and

a second part disposed in the recess, facing the display panel and having a second refractive index greater than the refractive index of the base portion, the second part having side surfaces contacting the base portion,

wherein a vertical distance between the first surface and the display panel is less than a vertical distance between the second surface and the display panel,

wherein a width of the recess is gradually decreased toward the direction of the second surface of the base portion, and a distance between the second part and the display panel is less than a distance between the first part and the display panel,

wherein light discharged from the lower direction of the display filter is incident on the side surfaces of the first and second parts,

wherein the light incident on the side surfaces of the first part is reflected by the side surfaces of the first part and then discharged to the second surface of the base portion, and the light incident on the side surfaces of the second part is absorbed by the side surfaces of the second part, and

wherein a height of the side surfaces of the second part is 0.05 times greater and 0.45 times less than a height of the side surfaces of the first part.

11. The display device of claim 10 , wherein the first part is disposed in contact with the second part in the recess.

12. The display device of claim 10 , wherein the first refractive index is 0.82 times greater and 0.99 times less than the refractive index of the base portion.

13. The display device of claim 10 , wherein the refractive index of the base portion is 0.82 times greater and approximately 0.99 times less than the second refractive index.

14. The display device of claim 10 , wherein a degree of blackness of the first part is less than a degree of blackness of the second part.

15. The display device of claim 10 , wherein a width of the first part is less than a width of the second part.

16. The display device of claim 10 , wherein the first and second parts form a matrix or wavy configuration.

17. A method for forming a display filter disposed on a front surface of a display panel, the method comprising:

forming a base portion including a first surface facing the front surface of the display panel and a second surface opposing the first surface, wherein a recess is formed on the first surface;

forming a first part disposed in the recess, the first part having a first refractive index less than a refractive index of the base portion and having side surfaces contacting the base portion; and

forming a second part disposed in the recess, the second part having a second refractive index greater than the refractive index of the base portion, the second part having side surfaces contacting the base portion,

wherein a vertical distance between the first surface and the display panel is less than a vertical distance between the second surface and the display panel,

wherein a width of the recess is gradually decreased toward the direction of the second surface of the base portion, and a distance between the second part and the display panel is less than a distance between the first part and the display panel,

wherein light discharged from the lower direction of the display filter is incident on the side surfaces of the first or second parts,

wherein the light incident on the side surfaces of the first part is reflected by the side surfaces of the first part and then discharged to the second surface of the base portion, and the light incident on the side surfaces of the second part is absorbed by the side surfaces of the second part, and

wherein a height of the side surfaces of the second part is 0.05 times greater and 0.45 times less than a height of the side surfaces of the first part.

18. The method of claim 17 , wherein the step of forming the first part includes:

forming first resin having carbon particles on the first surface of the base portion; and

scraping the first surface of the base portion having the first resin therein so as to form the first part in the recess of the base portion.

19. The method of claim 18 , wherein the step of forming the second part includes:

forming a second resin having carbon particles on the first surface of the base portion having the first part; and

scraping the first surface of the base portion having the second resin so as to form the second part on the first part in the recess of the base portion.