Plasma display device

A filter for shielding external light applied to a display panel, comprising:

• an external light shield sheet including a base unit and a plurality of pattern units formed on the base unit, that have a refractive index higher than that of the base unit and that are configured to absorb external light incident at a front surface of a display panel to which the external light shield sheet is applied,
• wherein a distance between two adjacent black matrixes of a plurality of black matrixes formed in the panel is 7 to 12 times greater than that between bottoms of two adjacent pattern units of the plurality of pattern units, and
• wherein a thickness of the external light shield sheet is 1.01 to 1.3 times greater than a height of the pattern unit.

A filter for shielding external light applied to a display panel, comprising:

• an external light shield sheet including a base unit and a pattern unit formed on the base unit, that has a refractive index higher than that of the base unit and that is configured to absorb external light incident at a front surface of a display panel to which the external light shield sheet is applied,
• wherein a width of the black matrix formed in the panel is 10 to 15 times greater than that of the pattern unit, and
• wherein a thickness of the external light shield sheet is 1.01 to 1.3 times greater than a height of the pattern unit.

A filter disposed at a front surface of a plasma display panel comprising first and second electrodes formed in an upper substrate, a third electrode formed in a lower substrate, and barrier ribs for partitioning a plurality of discharge cells, comprising:

• an external light shield sheet including a base unit and a plurality of pattern units formed on the base unit that have a refractive index higher than that of the base unit and that are configured to absorb external light incident at the front surface of the plasma display panel,
• wherein in any one of the plurality of discharge cells, a distance between the first and second electrodes is 4 to 10 times greater than that between bottoms of two adjacent pattern units of the plurality of pattern units, and
• wherein a thickness of the external light shield sheet is 1.01 to 1.3 times greater than a height of the pattern unit.

A filter comprising:

• an external light shield sheet including a base unit and a plurality of pattern units formed on the base unit that have a refractive index higher than that of the base unit and that are configured to absorb external light incident at a front surface of a display panel to which the external light shield sheet is applied,
• wherein a distance between two adjacent horizontal barrier ribs formed in a display panel is 6 to 20 times greater than that between bottoms of two adjacent pattern units of the plurality of pattern units, and
• wherein a thickness of the external light shield sheet is 1.01 to 1.3 times greater than a height of the pattern unit.