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US 9,958,601 B2Granted
Display backlight
AssigneeUniversity of Utah Research Foundation
InventorsRajesh Menon, Arkady Rudnitsky, Zeev Zalevsky
Life of this patent
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Abstract
A display backlight can include a light source and a parabolic waveguide. The parabolic waveguide can have a light inlet to receive the light from the light source, a parabolic reflective surface adapted to change a direction of the light emitted from the light source by a predetermined angle, and a light outlet configured to emit the light at the predetermined angle.
Claims30
A display backlight comprising:
- a light source oriented to emit light in a first direction;
- a parabolic waveguide having a light inlet to receive the light from the light source, a parabolic reflective surface adapted to change a direction of the light emitted from the light source by a predetermined angle, and a light outlet configured to emit the light at the predetermined angle with a first size;
- a first refractive element to receive the light emitted from the light outlet of the parabolic waveguide at the predetermined angle and redirect the light to a second predetermined angle, wherein the parabolic waveguide and the first refractive element are separated by a gap that causes the light emitted from the light outlet to increase to a second size;
- and
- a second refractive element to receive the light emitted from the first refractive element at the second predetermined angle and redirect the light to a third predetermined angle.
2 more elements
Dependencies are inferred from the claim text.