Backlight unit and display device. The backlight unit comprises at least one light emitting component and at least one reflection support component, wherein the light emitting component comprises a plurality of element surfaces disposed obliquely to a substrate of the backlight, so as to form, for example, a pyramid and a plurality of light emitters disposed on the element surfaces; the reflection support component comprises a plurality of reflective surfaces disposed obliquely to the substrate, so as to form, for example, a pyramid.