Backlight unit and display device including the same technical field

A backlight unit comprising:

• a substrate including a groove having side walls applied with a reflective material and having a first height;
• a light-emitting device in the groove and having a second height lower than the first height;
• a color resin in the groove and on the light-emitting device, the color resin having a third height lower than the first height;
• a light path modulator in the groove and on the color resin, the light path modulator having a refractive index different from a refractive index of the color resin to reflect light emitted from the light-emitting device at a boundary of the light path modulator and the color resin towards the side walls of the grooves;
• an adhesive film on the light path modulator;
• and
• a light-modifying sheet on the adhesive film, the light-modifying sheet including a plurality of light-modifying patterns,
• wherein the light path modulator overlaps with at least one of the plurality of light-modifying patterns, and
• wherein the light path modulator is located within the groove and surrounded by the color resin, the side walls, and the adhesive film.

A method for manufacturing a backlight unit, the method comprising:

• disposing a plurality of light-emitting devices in areas of a substrate;
• disposing a lower reflector on the substrate with holes of the lower reflector accommodating and exposing the plurality of light-emitting devices, the holes having a depth greater than a height of the plurality of light-emitting devices;
• curing a color resin in the holes, the cured resin having a height lower than the depth;
• disposing a light path modulator in the holes and on the color resin, the light path modulator having a different refractive index than that of the color resin;
• disposing an adhesive film on the lower reflector and the light path modulator;
• and
• disposing a light-modifying sheet on the adhesive film, the light-modifying sheet including a plurality of light-modifying patterns,
• wherein the light path modulator overlaps with at least one of the plurality of light-modifying patterns, and
• wherein the light path modulator is located within at least one of the holes and surrounded by the color resin, the lower reflector, and the adhesive film.

A backlight unit comprising:

• a light-emitting device having a flip chip structure;
• a first reflector disposed to surround a first area including the light-emitting device and a periphery of the light-emitting device;
• a color resin disposed in the first area;
• an adhesive film disposed above the color resin to be spaced apart from the color resin by a predetermined distance;
• a light path modulator above the light-emitting device and on the color resin;
• and
• a light modifying sheet disposed on the adhesive film and including a light modifying pattern disposed to correspond to a position of the light-emitting device,
• wherein the adhesive film is on the light path modulator,
• wherein the light path modulator overlaps with the light-modifying pattern, and
• wherein the light path modulator is located within a hole in the first area and surrounded by the color resin, the first reflector, and the adhesive film.

A display device comprising:

• a display panel;
• a backlight unit disposed below the display panel and configured to radiate light to the display panel,
• wherein the backlight unit comprises:
• a light-emitting device having a flip chip structure;
• a first reflector disposed to surround a first area including the light-emitting device and a periphery of the light-emitting device;
• a color resin disposed in the first area;
• an adhesive film disposed above the color resin to be spaced apart from the color resin by a predetermined distance;
• a light path modulator above the light-emitting device and on the color resin;
• and
• a light modifying sheet disposed on the adhesive film and including a light modifying pattern disposed to correspond to a position of the light-emitting device,
• wherein the adhesive film is on the light path modulator,
• wherein the light path modulator overlaps with the light modifying pattern, and
• wherein the light path modulator is located within a hole in the first area and surrounded by the color resin, the first reflector, and the adhesive film.