Backlight unit and display apparatus including the same

A display apparatus, comprising:

• a display panel configured to display an image;
• a light guide member disposed below the display panel, the light guide member comprising a light incident surface defined on at least one side surface thereof;
• a light source disposed adjacent to the light incident surface, the light source configured to generate blue light;
• a first light conversion layer disposed between the light guide member and the display panel, the first light conversion layer comprising a plurality of quantum dots;
• a low refractive layer disposed between the light guide member and the first light conversion layer, the low refractive layer having a refractive index less than that of the light guide member;
• a first protective layer disposed between the first light conversion layer and the display panel, the first protective layer covering the first light conversion layer, and
• a second light conversion layer disposed between the low refractive index layer and the first light conversion layer, the second light conversion layer comprising a plurality of KSF phosphors,
• wherein the first light conversion layer is configured to convert the blue light into green light,
• wherein the second light conversion layer is configured to convert the blue light into red light.

A backlight unit, comprising:

• a light guide member comprising a light incident surface defined on at least one side surface thereof;
• a light source disposed adjacent to the light incident surface, the light source configured to generate blue light;
• a first light conversion layer disposed on the light guide member, the first light conversion layer comprising a plurality of quantum dots;
• a low refractive layer disposed between the first light conversion layer and the light guide member, the low refractive layer having a refractive index less than that of each of the first light conversion layer and the light guide member;
• and
• a second light conversion layer disposed between the first light conversion layer and the light source, the second light conversion layer comprising a plurality of KSF phosphors (K2SiF6:Mn4+),
• wherein the first light conversion layer is configured to convert the blue light into green light,
• wherein the second light conversion layer is configured to convert the blue light into red light,
• wherein a central area and a peripheral area surrounding the central area are defined on a top surface of the light guide member, wherein the central area of the light guide member contacts a bottom surface of the low refractive layer, and
• wherein at least a portion of the peripheral area of the light guide member is coupled to an edge of a bottom surface of a display panel.