HOT LIGHT EMITTING DIODE (LED) LIGHTING SYSTEMS
First Claim
1. A Light Emitting Diode (LED) lighting system comprising:
- an unpackaged LED die that is devoid of encapsulant directly thereon;
a power supply that is electrically connected to the unpackaged LED die and that is configured to bias the unpackaged LED die so as to allow a junction temperature of the unpackaged LED die above 85°
C.; and
a wavelength conversion material that is spaced apart from the unpackaged LED die and that is configured to downconvert at least some of the light that is emitted by the unpackaged LED die.
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Accused Products
Abstract
LED lighting systems operate their LED above a junction temperature of 85° C. and space apart from the LED, components of the LED lighting system that reduce an expected lifetime of the LED lighting system to less than 25,000 hours as a result of operating the LED above the junction temperature of 85° C. Accordingly, the LED itself may be driven hotter than is conventionally the case, without impacting its lifetime. By allowing the LED to operate hotter, reduced heat sinking may be needed for the LED itself, which can decrease the cost, size and/or complexity of the thermal management system for the LED lighting system and/or can allow a thermal budget for the LED lighting system to be used elsewhere. Related structures are also described.
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Citations
20 Claims
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1. A Light Emitting Diode (LED) lighting system comprising:
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an unpackaged LED die that is devoid of encapsulant directly thereon; a power supply that is electrically connected to the unpackaged LED die and that is configured to bias the unpackaged LED die so as to allow a junction temperature of the unpackaged LED die above 85°
C.; anda wavelength conversion material that is spaced apart from the unpackaged LED die and that is configured to downconvert at least some of the light that is emitted by the unpackaged LED die. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 18)
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13. A Light Emitting Diode (LED) lighting system comprising:
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an unpackaged LED die that is devoid of encapsulant directly thereon; a power supply that is electrically connected to the unpackaged LED die and that is configured to bias the unpackaged LED die; and a wavelength conversion material that is spaced apart from the unpackaged LED die and that is configured to downconvert at least some of the light that is emitted by the unpackaged LED die. - View Dependent Claims (14, 15, 16, 17)
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19. A Light Emitting Diode (LED) lighting system comprising:
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an unpackaged LED die that is devoid of encapsulant directly thereon; a power supply that is electrically connected to the unpackaged LED die and that is configured to bias the unpackaged LED die; and a wavelength conversion material that is spaced apart from the unpackaged LED die and that is configured to downconvert at least some of the light that is emitted by the unpackaged LED die; wherein the unpackaged LED die comprises a blue unpackaged LED die and the LED lighting system further comprises a red LED, wherein the LED lighting system comprises a thermal management structure that provides greater thermal dissipation for the red LED than for the blue unpackaged LED die. - View Dependent Claims (20)
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Specification