Display apparatus

A display apparatus comprising:

• a substrate;
• a light emitting diode provided on the substrate;
• a quantum dot cover covering the light emitting diode and configured to convert a wavelength of light emitted from the light emitting diode;
• a refractive cover covering the quantum dot cover and having a recessed portion that is recessed toward the quantum dot cover, a lower surface of the recessed portion having a contour that is substantially similar to a contour of the quantum dot cover;
• and
• a reflector provided in the recessed portion positioned above the quantum dot cover,
• wherein a diameter of a lower surface of the reflector is smaller than a diameter of an upper surface of the reflector,
• wherein the lower surface of the reflector is upwardly convex such that the light emitted from the light emitting diode with an angle higher than an upper limit of a beam angle profile of the light is reflected from the lower surface of the reflector, and the light reflected from the lower surface of the reflector is reflected again by a lower reflector, and
• wherein the beam angle profile of the light is changed in accordance with a change of a linear distance between a center portion of the lower surface of the reflector and a center portion of an upper surface of the quantum dot cover.

A display apparatus comprising:

• a liquid crystal panel;
• and
• a backlight unit configured to provide light to the liquid crystal panel,
• wherein the backlight unit comprises:
• a substrate;
• a light emitting diode provided on the substrate;
• a quantum dot cover covering the light emitting diode and configured to convert a wavelength of light emitted from the light emitting diode;
• a refractive cover covering the quantum dot cover, wherein a surface of the refractive cover has a recessed portion that is recessed toward the quantum dot cover;
• and
• a reflector provided in the recessed portion to be positioned above the quantum dot cover,
• wherein a diameter of a lower surface of the reflector is smaller than a diameter of an upper surface of the reflector, and
• wherein the display apparatus further comprises a glass beads array provided on the lower surface of the reflector or a microprism array provided on the lower surface of the reflector.