Color conversion sheet, backlight unit and display device

A backlight unit, comprising:

• a plurality of light sources configured to emit light in a first wavelength band;
• a reflection plate arranged in at least some of areas, excluding areas in which the light sources are arranged;
• a light source protector arranged on the light sources and the reflection plate;
• a transparent film arranged on the light source protector, the transparent film comprising a plurality of light blocking patterns arranged on a lower surface thereof;
• an adhesive layer provided in at least some of areas, excluding areas where the light blocking patterns are arranged, between the light source protector and the transparent film to be spaced apart from the light blocking pattern, wherein an air gap is provided between the light source protector and the light blocking patterns;
• and
• a color conversion sheet provided on the transparent film, the color conversion sheet comprising:
• a color conversion layer configured to:
• react to the light in the first wavelength band;
• and
• emit light in a second wavelength band and light in a third wavelength band;
• a first reflection filter arranged on an upper surface of the color conversion layer;
• and
• a second reflection filter arranged on a lower surface of the color conversion layer, and
• wherein the first reflection filter has reflectance with respect to the light in the first wavelength band, and
• wherein the second reflection filter has reflectance with respect to the light in the second wavelength band and the light in the third wavelength band.

A display device, comprising:

• a display panel;
• and
• a backlight unit configured to supply light to the display panel, the backlight unit comprising:
• a plurality of light sources configured to emit light in a first wavelength band;
• a reflection plate arranged in at least some of areas, excluding the areas in which the light sources are arranged, wherein an upper surface of the reflection plate is positioned higher than an upper end of the light sources;
• a light source protector arranged on the light sources and the reflection plate;
• a color conversion sheet provided between the light source and the display panel;
• a transparent film provided between the light source protector and the color conversion sheet, the transparent film comprising a plurality of light blocking patterns arranged on a lower surface thereof;
• and
• an adhesive layer provided between the light source protector and the transparent film, wherein a gap is provided between the light source protector and the light blocking patterns,
• wherein the color conversion sheet comprises:
• a color conversion layer configured to:
• react to the light in the first wavelength band;
• and
• emit light in a second wavelength band and light in a third wavelength band;
• a first reflection filter arranged on an upper surface of the color conversion layer;
• and
• a second reflection filter arranged on a lower surface of the color conversion layer,
• wherein the first reflection filter has reflectance for the light in the first wavelength band, and
• wherein the second reflection filter has reflectance for the light in the second wavelength band and the light in the third wavelength band.