Color conversion film for backlight unit
A color conversion film for a backlight unit comprising an array of light emitting diodes includes a substantially planar base portion configured to receive light from a light source positioned below the substantially planar base portion. A plurality of three-dimensional structures are configured to extend from the substantially planar base portion in a direction away from the light source, where each of the plurality of three-dimensional structures having at least one sloped surface at an angle Θ relative to the substantially planar base portion such that each of the plurality of three-dimensional structures comprises a decreasing cross-section as light travels away from the light source.
1. A color conversion film for a backlight unit comprising an array of light emitting diodes, the color conversion film comprising:
a substantially planar base portion configured to receive light from a light source positioned below the substantially planar base portion; and
a plurality of three-dimensional structures comprising a color conversion material and configured to extend from the substantially planar base portion in a direction away from the light source, each of the plurality of three-dimensional structures having at least one sloped surface at an angle Θ relative to the substantially planar base portion such that each of the plurality of three-dimensional structures comprises a decreasing cross-section as light travels away from the light source, wherein the angle Θ is chosen such that light rays entering the substantially planar base portion at different angles have similar path lengths to exit the plurality of three-dimensional structures, thereby equalizing an absorption of light for the light rays entering the substantially planar base portion at different angles.
2. The color conversion film according to claim 1 , wherein the substantially planar base portion has a thickness of up to about 15 μm.
3. The color conversion film according to claim 1 , wherein the color conversion film comprises a material having a refractive index in a range of about 1.5-1.7.
4. The color conversion film according to claim 1 , wherein the color conversion material comprises phosphor material.
5. The color conversion film according to claim 1 , wherein the color conversion material comprises a material having quantum dots.
6. The color conversion film according to claim 1 , wherein each of the plurality of three-dimensional structures is cone shaped.
7. The color conversion film according to claim 6 , wherein a peak of at least one of the plurality of three-dimensional structures is truncated and/or rounded.
8. The color conversion film according to claim 1 , wherein each of the plurality of three-dimensional structures is pyramid shaped.
9. The color conversion film according to claim 8 , wherein a peak of at least one of the plurality of three-dimensional structures is truncated and/or rounded.
10. The color conversion film according to claim 1 , wherein bases of the plurality of three-dimensional structures cover a majority of the substantially planar base portion.
11. The color conversion film according to claim 1 , wherein bases of the plurality of three-dimensional structures are tiled together.
12. The color conversion film according to claim 1 , wherein the plurality of three-dimensional structures comprises bases having widths in the range of about 30 μm to about 75 μm.
13. The color conversion film according to claim 1 , wherein the angle Θ comprises an angle between 55°-75°.
14. The color conversion film according to claim 1 , wherein the angle Θ comprises an angle of nominally 60°.
15. The color conversion film according to claim 1 , wherein the angle Θ comprises an angle of nominally 70°.