Backlight unit and display device

The backlight unit of claim 21, wherein a refractive index of the color conversion light guide layer is different from a refractive index of the non-color conversion light guide layer,

The backlight unit of claim 21, wherein at least a portion of the light emitted from the plurality of light sources is totally reflected at an interface between the color conversion light guide layer and the non-color conversion light guide layer.

The backlight unit of claim 21, wherein the color conversion light guide layer comprises a resin having a first refractive index,

• the non-color conversion light guide layer covers the plurality of light sources and is located below the color light guide layer, and
• the non-color conversion light guide layer comprises a resin having a second refractive index smaller than the first refractive index.

The backlight unit of claim 21, wherein a thickness of the color conversion light guide layer is greater than a thickness of the non-color conversion light guide layer.

The backlight unit of claim 21, wherein the color conversion light guide layer covers the plurality of light sources and comprises a resin having a third refractive index, and

• the non-color conversion light guide layer is disposed on the color light guide layer, and comprises a resin having a fourth refractive index greater than the third refractive index. S. (Original) The backlight unit of claim 1, wherein the color conversion light guide layer comprises a resin mixed with a plurality of color conversion phosphors.

The backlight unit of claim 21, wherein one of the color conversion light guide layer and the non-color conversion light guide layer is spaced apart from the plurality of light sources and the reflective layer.

(canceled)