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US 9,287,242 B2Granted
Light emitting device, method for manufacturing light emitting device, illuminating device, and backlight
AssigneeSharp Kabushiki Kaisha
InventorsAkihide Shibata, Tetsu Negishi, Kenji Komiya, Hiroshi Iwata, Akira Takahashi
Life of this patent
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Abstract
In a light emitting device, one hundred or more bar-like structured light emitting elements (210) each having a light emitting area of 2,500π μm2 or less are placed on a mounting surface of one insulating substrate (200), so that the light emitting device fulfills little variation in luminance, long life, and high efficiency by dispersion of light emission with suppression of increase in temperatures in light emitting operations.
Claims14
A light emitting device comprising:
- a substrate having a mounting surface;
- and
- one hundred or more light emitting elements placed on the mounting surface of the substrate, the light emitting elements each having a light emitting area of 2,500π μm2 or less,
- at least one of the light emitting elements being in shape of a bar,
- the at least one light emitting element in shape of a bar having a cylindrical light emitting surface that concentrically surrounds a bar-like core,
- no pn junctions, which are perpendicular to an axis direction of the bar, existing in the middle of the bar, and
- an area of the mounting surface of the substrate being equal to or larger than four times as large as a sum total of the light emitting areas of the light emitting elements.
4 more elements
A light emitting device comprising:
- a substrate having a mounting surface;
- and
- one hundred or more light emitting elements placed on the mounting surface of the substrate, the light emitting elements each having a light emitting area of 2,500π μm 2 or less,
- an area of the mounting surface of the substrate being equal to or larger than four times as large as a sum total of the light emitting areas of the light emitting elements.
1 more element
Dependencies are inferred from the claim text.