Backlight unit, display apparatus including the same, and manufacturing method thereof

A display apparatus comprising:

• a light source configured to generate light;
• a display panel configured to display images;
• a light guide member comprising-at least one surface adjacent to the light source;
• and
• an optical member-between the light guide member and the display panel,
• wherein:
• the optical member comprises:
• a low refraction layer-on a light output-surface of the light guide member and comprising-side surfaces;
• a first cover layer-on the low refraction layer and surrounding at least a portion of the side surfaces of the low refraction layer;
• and
• a light conversion layer-on the first cover layer, the light conversion layer being configured to convert a-wavelength band of-incident light;
• and
• the first cover layer comprises:
• a barrier layer-on an upper portion of the low refraction layer and comprising an inorganic material;
• and
• an adhesive layer-between the low refraction layer and the barrier layer, the adhesive layer increasing adhesion between the low refraction layer and the barrier layer.