Color conversion film back light unit for backlit displays

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 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 with a base angle of about 55°-75° 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,

the color conversion film comprising a material having a refractive index of about 1.5-1.7.

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 material comprises phosphor material.

4. The color conversion film according to claim 1 , wherein the material comprises quantum dots.

5. The color conversion film according to claim 1 , wherein each of the plurality of three-dimensional structures has a shape selected from the group consisting of a pyramid and a cone.

6. A back light unit comprising:

an array of blue light emitting diodes;

a first substrate constructed and arranged to diffuse light emitted from the array of blue light emitting diodes;

a color conversion layer having:

a base portion with a first side in contact with the first substrate and a second side opposite the first side and configured to receive light from the array of blue light emitting diodes positioned below the base portion; and a plurality of three-dimensional structures extending from the second side of the 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, each of the three-dimensional structures having at least one sloped surface with a base angle of about 55°-75°, wherein the color conversion layer has a refractive index of about 1.5-1.7; and

a second substrate in contact with the plurality of three-dimensional structures, wherein the second substrate has a refractive index of about 0.05 to 0.3 less than the refractive index of the color conversion layer.

7. The back light unit according to claim 6 , wherein the base portion of the color conversion layer has a thickness of up to about 15 μm.

8. The back light unit according to claim 6 , wherein the color conversion layer has a refractive index of 1.6, and the second substrate has a refractive index of 1.5.

9. The back light unit according to claim 8 , wherein the base angle is about 70°.

10. The back light unit according to claim 6 , wherein the color conversion layer has a refractive index of 1.7, and the second substrate has a refractive index of 1.5.

11. The back light unit according to claim 10 , wherein the base angle is about 60°.

12. The back light unit according to claim 6 , wherein the difference between refractive indices of the color conversion layer and the second substrate is 0.1, and the base angle is about 70°.

13. The back light unit according to claim 6 , wherein the difference between refractive indices of the color conversion layer and the second substrate is 0.2, and the base angle is about 60°.

14. The back light unit according to claim 6 , wherein each of the plurality of three-dimensional structures has a shape selected from the group consisting of a pyramid and a cone.

15. The back light unit according to claim 6 , wherein the color conversion layer comprises phosphor material.

16. The back light unit according to claim 6 , wherein the color conversion layer comprises quantum dots.