Color tunable organic electroluminescent light source
AssigneeGeneral Electric Company
InventorAnil Raj Duggal
Life of this patent
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Abstract
A light emitting device is provided. The light emitting device contains an array of organic light emitting diodes (OLEDs) emitting a plurality of colors, and a layer of scattering media above the light emitting surface of the OLED array. The emission color of the OLEDs may be tuned by applying different power to different sets of OLEDs. The scattering media mixes the colors from each set of OLEDs, such that the device light output has a white color having a desired color temperature.
Claims33
A light emitting device, comprising:
- an array of organic light emitting diodes (OLEDs) emitting a plurality of colors, said array comprising a plurality of groups of OLEDs, each of said group being capable of being controlled to emit at least one of said colors;
- and
- a scattering medium disposed adjacent to a light-emitting surface of the array.
A light emitting device comprising:
- an array of organic light emitting diodes (OLEDs) emitting a plurality of colors, said array comprising a plurality of groups of OLEDs, each of said group being capable of being controlled to emit at least one of said colors, wherein the array comprises:
- a first set of a plurality of a first color light emitting OLEDs electrically connected together to a first power source such that each OLED of said first set receives the same power signal at the same time;
- and
- a second set of a plurality of a second color light emitting OLEDs electrically connected together to a second power source such that each OLED of said second set receives the same power signal at the same time.
A light emitting device comprising:
- an array of organic light emitting diodes (OLEDs) emitting a plurality of colors, said array comprising a plurality of groups of OLEDs, each of said group being capable of being controlled to emit at least one of said colors, wherein said light emitting device further comprises a layer of scattering medium that comprises particles that scatter in a substantially unattenuated manner visible light emitted by the OLEDs.
A light emitting device, comprising:
- (a) an array of OLEDs comprising:
- (i) a first set of a plurality of OLEDs electrically connected together to the same power source such that each OLED receives the same power signal at the same time, the first set of OLEDs emit light of a first color;
- and
- (ii) a second set of a plurality of OLEDs electrically connected together to the same power source such that each OLED receives the same power signal at the same time, the second set of OLEDs emit light of a second color different than the first color;
- and
- (b) a power controller which provides a first amount of power to the first set of OLEDs and a second amount of power to the second set of OLEDs to obtain a device light output having a desired color.
A method of generating white light, comprising:
- providing a first power signal having a first magnitude to a first set of plurality of OLEDs, such that the first set of OLEDs emit light of a first color;
- providing a second power signal having a second magnitude to a second set of plurality of OLEDs, such that the second set of OLEDs emit light of a second color different than the first color;
- and
- passing the light of the first color and the second color through a scattering medium to mix the light of the first and second colors such that the mixed light appears white to a human observer.
Dependencies are inferred from the claim text.