Prism sheet, backlight unit and liquid crystal display
The present invention relates to a liquid crystal display having excellent brightness without moiré patterns. The present invention also relates to a prism sheet and backlight unit which may improve the brightness of the liquid crystal display while removing the moiré patterns. A prism sheet comprises a protective layer including a base material consisting of a light-transmissive resin; and a plurality of diffusion particles distributed in the protective layer to scatter the light input into the base material; a base film disposed on a surface of the protective layer, wherein the light emitted from the protective layer is input into the base film; and a plurality of linear prisms having a pitch of between about 32 μm and about 38 μm and disposed in parallel on a surface of the base film.
1. A backlight unit configured to illuminate a liquid crystal panel, comprising:
at least one light source;
at least one prism sheet disposed at the back of the liquid crystal panel; and
a light guide plate including a light incidence surface disposed adjacent to the light source and a light emitting surface disposed substantially in parallel with the prism sheet,
wherein the prism sheet including:
a protective layer including a base material and a plurality of diffusion particles distributed in the base material, wherein the base material includes a light-transmissive resin;
a base film disposed on a surface of the protective layer, wherein the light emitted from the protective layer is input into the base film; and
a plurality of linear prisms disposed in parallel on a surface of the base film,
wherein the diffusion particles comprise a plurality of beads having a size of between about 2 μm and about 10 μm, and the plurality of linear prisms have a pitch of between about 32 μm and about 36 μm, and
wherein the at least one prism sheet includes at least two prism sheets disposed in such a manner that the axes of the linear prisms of the two prism sheets are disposed to cross each other.
2. The backlight unit of claim 1 , wherein the prism sheet further comprises a prism base disposed between the base film and the plurality of linear prisms.
3. The backlight unit of claim 1 , wherein the plurality of beads are substantially of the same size.
4. The backlight unit of claim 1 , wherein the cross-section of the linear prism includes an isosceles triangle or a scalene triangle.
5. A liquid crystal display comprising:
a liquid crystal panel displaying images according to electrical signals provided from the outside device; and
a backlight unit configured to illuminate a liquid crystal panel, comprising:
at least one light source;
at least one prism sheet disposed at the back of the liquid crystal panel; and
a light guide plate including a light incidence surface disposed adjacent to the light source and a light emitting surface disposed substantially in parallel with the prism sheet,
wherein the prism sheet including:
a protective layer including a base material and a plurality of diffusion particles distributed in the base material, wherein the base material includes a light transmissive resin;
a base film disposed on a surface of the protective layer, wherein the light emitted from the protective layer is input into the base film; and
a plurality of linear prisms disposed in parallel on a surface of the base film,
wherein the diffusion particles comprise a plurality of beads having a size of between about 2 μm and about 10 μm, and the plurality of linear prisms have a pitch of between about 32 μm and about 36 μm, and
wherein the at least one prism sheet includes at least two prism sheets disposed in such a manner that the axes of the linear prisms of the two prism sheets are disposed to cross each other.
6. The liquid crystal display of claim 5 , wherein the plurality of beads are substantially of the same size.
7. The liquid crystal display of claim 5 , wherein the cross-section of the linear prism taken normal to an axis of the linear prism includes an isosceles triangle or a scalene triangle.