Tunable LED-filaments and tunable LED-filament lamps
AssigneeIntematix Corporation
InventorsYi-Qun Li, Gang Wang, Jun-Gang Zhao
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Abstract
An LED-filament includes a light-transmissive substrate; a first array of LED chips on a front face of the substrate; a second array of LED chips on the front face of the substrate; a first photoluminescence arrangement covering the first array of LED chips; and a second photoluminescence arrangement covering the second array of LED chips; where the first array of LED chips and the first arrangement generate light of a first color temperature and the second array of LED chips and the second arrangement generate light of a second color temperature.
Claims20
A tunable LED-filament comprising:
- a light-transmissive substrate;
- a first array of LED chips on a front face of the substrate;
- a second array of LED chips on the front face of the substrate;
- a first layer having a first photoluminescence material, wherein the first layer is a single continuous strip that is disposed on and encapsulates all LED chips of the first array;
- and
- a second layer having a second photoluminescence material that covers all LED chips of the second array and the first layer of photoluminescence material;
- wherein the combination of the first array of LED chips and the first and second photoluminescence materials generates light of a first color temperature and wherein the second array of LED chips and wherein the combination second photoluminescence material generates light of a second color temperature;
- and
- wherein the first and second array of LED chips comprise an electrical arrangement in which the color temperature of light generated by the LED-filament is tunable by controlling the relative power applied to the first and second array of LED chips.
A tunable LED-filament comprising:
- a light-transmissive substrate;
- a first linear array of LED chips on a front face of the substrate;
- a second linear array of LED chips on the front face of the substrate;
- wherein the first and second linear arrays of LED chips are arranged in parallel in a direction of elongation of the substrate;
- a first material comprising at least one photoluminescence material covering all LEDs of the first linear array;
- and
- a second material comprising at least one photoluminescence material covering all LEDs of the second linear array;
- wherein the first linear array of LED chips and the first material generate a majority of light of a first color temperature and the second linear array of LED chips and the second material generate a majority of light of a second color temperature;
- wherein the first and second linear arrays of LED chips comprise an electrical arrangement in which the color temperature of light generated by the LED-filament is tunable by controlling the relative power applied to the first and second linear arrays of LED chips;
- and
- wherein the first material comprises a layer having a majority of a manganese-activated fluoride narrowband red photoluminescence material and wherein the layer is a single continuous strip that is disposed on and encapsulates all LED chips of the first linear array of LED chips.
Dependencies are inferred from the claim text.