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US 10,241,253 B2Granted
Light bar containing symmetric LED placement and method of making thereof
AssigneeGlo AB
InventorsMichael Jansen, Sheng-Min Wang
Life of this patent
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Abstract
A light bar includes a plurality of light emitting diode (LED) clusters which extend along a lengthwise direction of the light bar from a first end of the light bar to an opposite second end of the light bar. Each LED cluster includes at least three different types of LEDs. A first LED at the first end of the light bar and a last LED at the second end of the light bar emit the same color light.
Claims19
A light bar comprising multiple instances of a repetition unit, wherein:
- the multiple instances of the repetition unit extend along a lengthwise direction of the light bar from a first end of the light bar to an opposite second end of the light bar;
- the multiple instances of the repetition unit are periodically positioned, and are oriented to emit light along parallel light emission directions that are perpendicular to the lengthwise direction of the light bar;
- the repetition unit includes at least eight light emitting diodes containing at least three types of light emitting devices;
- and
- an entire sequence of all light emitting devices within the repetition unit from one end of the repetition unit to the other end of the repetition unit is a symmetric sequence in which a reverse sequence of the symmetric sequence is identical to the symmetric sequence, and which provides a symmetric light spectrum distribution about a center of the symmetric sequence,
- wherein the repetition unit comprises:
- a first light emitting device cluster including a first sequence of instances of the at least three types of light emitting devices;
- and
- a second light emitting device cluster located adjacent to the first light emitting device cluster and including a second sequence of instances of the at least three types of light emitting devices that is a reverse sequence of the first sequence;
- and
- wherein the second sequence is different from the first sequence.
8 more elements
A method of making a light bar, comprising:
- separately fabricating a plurality of light emitting diode (LED) clusters, wherein each LED cluster includes at least three different types of LEDs;
- and
- attaching the plurality of LED clusters to a support to form the light bar such that the light bar comprises multiple instances of a repetition unit that is an LED cluster,
- wherein:
- the multiple instances of the repetition unit extend along a lengthwise direction of the light bar from a first end of the light bar to an opposite second end of the light bar;
- the multiple instances of the repetition unit are periodically positioned, and are oriented to emit light along parallel light emission directions that are perpendicular to the lengthwise direction of the light bar;
- the repetition unit includes at least three types of light emitting devices;
- and
- an entire sequence of all light emitting devices within the repetition unit from one end of the repetition unit to the other end of the repetition unit is a symmetric sequence in which a reverse sequence of the symmetric sequence is identical to the symmetric sequence, and which provides a symmetric light spectrum distribution about a center of the symmetric sequence,
- wherein the repetition unit comprises:
- a first light emitting device cluster including a first sequence of instances of the at least three types of light emitting devices;
- and
- a second light emitting device cluster located adjacent to the first light emitting device cluster and including a second sequence of instances of the at least three types of light emitting devices that is a reverse sequence of the first sequence;
- and
- wherein the second sequence is different from the first sequence.
12 more elements
Dependencies are inferred from the claim text.