External light shielding layer, filter for display apparatus and display apparatus having the same

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

a base substrate made of a transparent resin; and

at least one external light-shielding part arranged on a surface of the base substrate and filled with an external light-absorption material,

wherein n y of a refractive index of the base substrate is less than or equal to n x of a refractive index of the external light-shielding part.

2. The external light-shielding layer of claim 1 , wherein the external light-shielding part comprises:

a bottom surface exposed to the outside of the base substrate, the bottom surface being formed on the surface of the base substrate and facing toward a panel assembly; and

a pair of inclined surfaces defining a wedge-shaped groove formed into the base substrate from the bottom surface.

3. The external light-shielding layer of claim 1 , wherein the external shielding part is arranged in a transverse direction with respect to a viewer.

4. The external light-shielding layer of claim 1 , wherein the external shielding part corresponds to any one of a wedge-shaped black stripe form, a wedge-shaped black matrix form, a wedge-shaped black wave form, a flat-shaped black stripe form, a flat-shaped black matrix form, and a flat-shaped black wave form.

5. The external light-shielding layer of claim 1 , wherein a difference between n x of the refractive index of the external light-shielding part and n y of the refractive index of the base substrate is less than 0.05.

6. The external light-shielding layer of claim 1 , wherein a width of the external light-shielding part formed in the surface of the base substrate is 10 to 50 μm.

7. The external light-shielding layer of claim 2 , further comprising a bead lens arranged on the surface of the base substrate,

wherein the external light-shielding part is positioned between the base substrate and the bead lens.

8. The external light-shielding layer of claim 1 , wherein the external light-absorption material consists of a black inorganic material, a black organic material, and a metal.

9. The external light-shielding layer of claim 8 , wherein the external light-absorption material is a carbon black.

10. A filter for a display apparatus, comprising:

a filter base; and

an external light-shielding layer formed on a surface of the filter base, and including a base substrate made of a transparent resin and at least one external light-shielding part arranged on a surface of the base substrate,

wherein n y of a refractive index of the base substrate is less than or equal to n x of a refractive index of the external light-shielding part.

11. The filter of claim 10 , wherein the external light-shielding part comprises:

a bottom surface exposed to the outside of the base substrate, the bottom surface being formed on the surface of the base substrate and facing toward a panel assembly; and

a pair of inclined surfaces defining a wedge-shaped groove formed into the base substrate from the bottom surface.

12. A display apparatus, comprising:

a panel assembly including a transparent front substrate and a transparent rear substrate, and at least one cell between the front substrate and the rear substrate, the front substrate and the rear substrate being combined faced together;

an external light-shielding layer for the display filter of claim 1 being attached to the front substrate; and

a filter disposed opposite to the external light-shielding layer.

13. A display apparatus, comprising:

a panel assembly including a transparent front substrate and a transparent rear substrate, and at least one cell between the front substrate and the rear substrate, the front substrate and the rear substrate being combined faced together; and

a filter for the display apparatus of claim 12 , the filter being disposed opposite to the front substrate.

14. The display apparatus of claim 13 , wherein the display apparatus is any one of a large-sized display apparatus corresponding to one selected from among a Plasma Display Panel (PDP) apparatus, an Organic Light Emitting Diode (OLED) apparatus, a Liquid Crystal Display (LCD) apparatus, and a Field Emission Display (FED) apparatus, a small-sized mobile display apparatus corresponding to any one of a display window of a small-sized game device and a display window of a mobile phone, and a flexible display apparatus.