Lighting device for frequency-modulated emission
Lighting devices and methods of manufacture are described. A lighting device includes a substrate, multiple light-emitting diodes (LEDs) on the substrate, an electronic switch on the substrate, and multiple connectors, each comprising a wire bond. Multiple wire bonds electrically couple at least two of the multiple LEDs and multiple wire bonds electrically couple the electronic switch and at least one of the plurality of LEDs.
1. A lighting device comprising:
a substrate;
a string of first electrode patches disposed on the substrate in a two-dimensional grid, the string comprising a beginning electrode patch, an ending electrode patch, and a plurality of intervening electrode patches between the beginning and ending electrode patches;
a second electrode patch adjacent the beginning electrode patch;
a plurality of light-emitting diodes (LEDs), wherein each one of the plurality of LEDs comprises a cathode and an anode, and a same one of the cathode or the anode of each of the plurality of LEDs is disposed directly on a respective one of the first electrode patches;
an electronic switch on the second electrode patch;
a plurality of first wire bonds electrically coupled between the anode or the cathode of a respective one of the plurality of LEDs that is not disposed directly on a respective one of the first electrode patches and an adjacent one of the first electrode patches; and
a plurality of second wire bonds electrically coupled between the second electrode patch and the beginning electrode patch in the string such that only the beginning electrode patch in the string is electrically coupled to the electronic switch via wire bonds.
2. The lighting device according to claim 1 , wherein the plurality of first wire bonds electrically couple the plurality of LEDs in series.
3. The lighting device according to claim 1 , wherein the electronic switch comprises at least one field-effect transistor.
4. The lighting device according to claim 1 , further comprising a third contact patch electrically coupled to a gate of the electronic switch via a single third wire bond.
5. The lighting device of claim 1 , wherein the first plurality of wire bonds comprises two wire bonds and the second plurality of wire bonds comprises two wire bonds.
6. The lighting device of claim 1 , wherein the second electrode patch is electrically coupled to an oscillating input for the electronic switch.
7. The lighting device of claim 1 , further comprising:
a fourth electrode patch on the substrate adjacent the ending electrode patch in the string and electrically coupled to a power source;
a plurality of fourth wire bonds electrically coupled between the fourth electrode patch and the ending electrode patch in the string.
8. The lighting device of claim 1 , wherein the electronic switch and the beginning electrode patch in the string are spaced apart at a distance smaller than a lateral extension of a single one of the plurality of LEDs.
9. The lighting device of claim 1 , wherein the electronic switch is in direct mechanical contact with the LED disposed on the beginning electrode patch in the string.
10. The lighting device of claim 1 , wherein each of the plurality of LEDs is spaced apart from any immediately adjacent one of the plurality of LEDs by a distance smaller than a lateral extension of a single one of the plurality of LEDs.
11. The lighting device of claim 1 , wherein each of the plurality of LEDs is in direct mechanical contact with any immediately adjacent one of the plurality of LEDs.
12. A time of flight system comprising:
a time of flight sensor; and
a lighting device comprising:
a substrate;
a string of first electrode patches disposed on the substrate in a two-dimensional grid, the string comprising a beginning electrode patch, an ending electrode patch, and a plurality of intervening electrode patches between the beginning and ending electrode patches;
a second electrode patch adjacent the beginning electrode patch;
a plurality of light-emitting diodes (LEDs), wherein each one of the plurality of LEDs comprises a cathode and an anode, and a same one of the cathode or the anode of each of the plurality of LEDs is disposed directly on a respective one of the first electrode patches;
an electronic switch on the second electrode patch; and
a plurality of first wire bonds electrically coupled between the anode or the cathode of a respective one of the plurality of LEDs that is not disposed directly on a respective one of the first electrode patches and an adjacent one of the plurality of electrode patches; and
a plurality of second wire bonds electrically coupled between the second electrode patch and the beginning electrode patch in the string such that only the beginning electrode patch in the string is electrically coupled to the electronic switch via wire bonds.