Light blocking layer, display filter having the light blocking layer, and display apparatus having the display filter

An external light-shielding layer for a display filter, the external light-shielding layer comprising:

• a base substrate comprising a transparent resin;
• and
• wedge-shaped light-shielding patterns spaced apart from each other on a surface of the base substrate at predetermined intervals, and made of a resin comprising a coloring agent, the coloring agent having a concentration of about 0.5% to about 1.5% by weight in the wedge-shaped light-shielding patterns,
• wherein each of the wedge-shaped light-shielding patterns comprises a bottom surface exposed on one surface of the substrate and inclined surfaces extending from the bottom surface and forming a wedge-shaped groove in the substrate, and the bottom surface faces a side opposite to a direction from which an external light comes,
• wherein a refractive index difference between the base substrate and the light-shielding patterns is less than or equal to 0.05,
• wherein an area ratio of the bottom surface of the light-shielding patterns to the surface of the base substrate corresponds to about 20% to 50% and a contrast ratio is greater than or equal to about 250:1 when the visible light transmittance is maintained to be greater than or equal to about 50%.