Back to results
US 7,479,660 B2Granted
Multichip on-board LED illumination device
AssigneePerkinelmer Elcos GmbH
InventorSiegmund Kobilke
Life of this patent
Estimating the term…
Abstract
An LED-based illumination device can use an array of four LEDs to produce high intensity light over a broad color spectrum and a broad range of color temperature. A high quality white light can be produced by using two green LEDs with a single red and a single blue LED.
Claims14
An illumination device, comprising:
- a single red light emitting diode (LED);
- a single blue LED;
- only one pair of green LEDs connected in series;
- and
- a substrate supporting the red, blue, and pair of green LEDs in a compact arrangement, the substrate including a circuit layout operable to receive current from an external source and pass that current to an appropriate one of the red, blue, and pair of green LEDs for generating light.
2 more elements
An illumination device, comprising:
- a substrate having an isolation layer formed thereon;
- a circuit layout positioned on the isolation layer, the circuit layout including a central bonding pad and a plurality of anode and cathode pads;
- a square array of four LED chips secured on the bonding pad, the square array including one red LED, one blue LED, and a pair of green LEDs, each of the red, blue, and pair of green LEDs electrically connected to the circuit layout in order to allow activation through the application of current to an appropriate pair of the plurality of anode and cathode pads;
- and
- an encapsulant positioned over the square array of four LED chips to prevent external contact with the square array while out coupling light from the square array.
2 more elements
A system for generating light of various colors, comprising:
- an illuminator including four LED chips including one red chip, one single blue chip, and only two green chips laid out in a closely spaced array on a substrate;
- electrical circuitry for selectively driving the chips with current to produce light;
- and
- a controller for controlling the electrical circuitry to vary current used to drive the chips to produce a selected color output.
1 more element
An illumination device, comprising:
- a substrate having an isolation layer formed thereon;
- a circuit layout positioned on the isolation layer, the circuit layout including a central bonding pad and a plurality of anode and cathode pads;
- a square array of four closely packed LED chips secured on the bonding pad, each of the LEDs being electrically connected to the circuit layout in order to allow activation through the application of current to an appropriate pair of the plurality of anode and cathode pads;
- and
- an encapsulant positioned over the square array of four ED chips to prevent external contact with the square array while out coupling light from the square array.
2 more elements
Dependencies are inferred from the claim text.