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US 7,608,991 B2Granted
Light emitting device
AssigneeKYOCERA Corporation
InventorsShinichi Abe, Motohiko Asano, Kazumasa Kobayashi, Koji Murayama
Life of this patent
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Abstract
There is provided a light emitting device having a plurality of luminous elements emitting with different colors respectively being improved in a luminous intensity deviation and a color deviation without deterioration of a luminous efficiency. In the light emitting device having a plurality of luminous elements respectively emitting with different colors, both a traveling wave of light and a reflected wave of light enhance intensity of light.
Claims24
A light emitting device comprising:
- a plurality of luminous elements emitting different colors, respectively, each element including a first electrode, a second electrode transmitting light, and a luminous layer disposed between an upper surface of the first electrode and a lower surface of the second electrode;
- a protecting layer covering the plurality of luminous elements, placed on an upper surface of the second electrode;
- and
- a control layer placed on the upper surface of the second electrode of one luminous element or more in the plurality of luminous elements, wherein
- when an interval from an upper surface of an uppermost layer among layers placed on an upper surface of the second electrode to the upper surface of the second electrode is defined as a first interval, an interval from a lower surface of the second electrode to the upper surface of the uppermost layer is defined as a second interval, and an interval from the upper surface of the first electrode to the upper surface of the uppermost layer is defined as a third interval, the first through the third intervals include a region outside of the luminous element, and
- optical distances of the respective intervals are set such that both a traveling wave of light and a reflected wave of light traveling within at least the first interval in the first through third intervals enhance intensity of light in each of the plurality of luminous elements.
3 more elements
A light emitting device comprising:
- a plurality of luminous elements emitting different colors, respectively, each element including a first electrode, a second electrode transmitting light, a luminous layer disposed between the first electrode and the second electrode, and a reflective layer disposed between the first electrode and the second electrode;
- a protecting layer covering the plurality of luminous elements, placed on the second electrode of the luminous element;
- and
- a control layer placed on the second electrode of one luminous element or more in the plurality of luminous elements, wherein
- when an interval from an upper surface of an uppermost layer among layers placed on an upper surface of the second electrode to an upper surface of the reflective layer is defined as a first interval, an interval from a lower surface of the reflective layer to the upper surface of the uppermost layer is defined as a second interval, and an interval from an upper surface of the first electrode to the upper surface of the uppermost layer is defined as a third interval, the first through the third intervals include an region outside of the luminous element, and
- optical distances of the respective intervals are set such that both a traveling wave of light and a reflected wave of light traveling within at least the first interval in the first through third intervals enhance intensity of light in each of the plurality of luminous elements.
3 more elements
Dependencies are inferred from the claim text.