Patent ID: 8120864

Claim:
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.