Light emitting diode
First Claim
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1. A light emitting diode (LED) comprising:
- a reflective layer on a substrate;
a phase retardation layer on the reflective layer;
a first wire grid polarizer on the phase retardation layer and including a plurality of conductive wires arranged in parallel to each other;
a light emitting unit on the first wire grid polarizer; and
a second wire grid polarizer on the light emitting unit and including a plurality of conductive wires arranged in parallel to each other,wherein the plurality of conductive wires of the first wire grid polarizer are arranged at an angle to the plurality of conductive wires of the second wire grid polarizer.
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Abstract
Example embodiments provide a light emitting diode (LED) having improved polarization characteristics. The LED may include wire grid polarizers on and below a light emitting unit. The wire grid polarizers may be arranged at an angle to each other. Thus, because the LED may emit a light beam in a given polarization direction, an expensive component, e.g., a dual brightness enhanced film (DBEF), is not required. Thus, manufacturing costs of a backlight unit including the LED and a display apparatus including the backlight unit may be reduced.
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Citations
25 Claims
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1. A light emitting diode (LED) comprising:
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a reflective layer on a substrate; a phase retardation layer on the reflective layer; a first wire grid polarizer on the phase retardation layer and including a plurality of conductive wires arranged in parallel to each other; a light emitting unit on the first wire grid polarizer; and a second wire grid polarizer on the light emitting unit and including a plurality of conductive wires arranged in parallel to each other, wherein the plurality of conductive wires of the first wire grid polarizer are arranged at an angle to the plurality of conductive wires of the second wire grid polarizer. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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6. The LED of claim 6, wherein each of the plurality of nano-rods comprises:
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a first semiconductor layer doped with a first type of impurities; a second semiconductor layer that is not doped; and a third semiconductor layer doped with a second type of impurities opposite to the first type of impurities, wherein the second semiconductor layer is an active layer having a quantum well generating a light beam.
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21. A light emitting diode (LED) comprising:
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a reflective layer on a substrate; a light emitting unit on the reflective layer; and a wire grid polarizer on the light emitting unit and including a plurality of conductive wires arranged in parallel to each other, wherein the light emitting unit includes a plurality of nano-dashes having a rectangular shape with a longer length compared to a width thereof, the plurality of nano-dashes are arranged in parallel to each other, and wherein each of the reflective layer and the plurality of conductive wires function as an electrode. - View Dependent Claims (22, 23, 24, 25)
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Specification