Die bond pad design to enable different electrical configurations
Light emitting die ( 300 ) comprising a plurality of light emitting elements (310A, 310B), each having a pair of bond pads (N 1, P 1 and N 2, P 2 ), wherein at least two diagonally opposite bond pads of adjacent light emitting elements on a die have their facing corners truncated ( 330 ) to enable a direct diagonal coupling of a complementary pair of diagonally opposite bond pads when the die is monted on a substrate on which an interconnection pattern is formed. By enabling diagonal as well as lateral coupling of the bond pads of multiple light emitting elements of a die, the multiple light emitting elements may be arranged in a variety of series and/or parallel configurations, thereby facilitating the use of the same die at different nominal operating voltages with a single interconnect layer on the substrate upon which the die is mounted.
1. A light emitting diode (LED) device comprising:
an LED die comprising a plurality of light emitting elements, each of the plurality of light emitting elements including a pair of bond pads coupled thereto, each of the bond pads having a rectangular shape with four orthogonal edges, and at least one of the bond pads in each pair having at least one truncated corner, each of the truncated corners forming an additional, non-orthogonal edge,
the plurality of light emitting elements being arranged within the die such that at least two diagonally opposite bond pads are truncated and have non-orthogonal edges that face one another.
2. The device of claim 1 , further comprising a substrate on which the die is mounted, the substrate comprising a single interconnect layer, the plurality of light emitting elements comprising four light emitting elements, and the bond pads being arranged to enable a selection of a nominal operating voltage of three, six, or twelve volts using the single interconnect layer on the substrate.
3. The device of claim 2 , wherein the four light emitting elements are arranged in a 2×2 array.
4. The device of claim 2 , wherein the four light emitting elements are arranged in a 1×4 array.
5. The device of claim 1 , wherein each of the truncated bond pads has five edges including the four orthogonal edges and one non-orthogonal edge.
6. The device of claim 1 , wherein at least one of the truncated bond pads has six edges including the four orthogonal edges and two non-orthogonal edges.
7. The device of claim 1 , further comprising a substrate on which the die is mounted, the substrate comprising a single interconnect layer, and the bond pads being arranged to enable an external coupling to a series connection of all of the plurality of light emitting elements using the single interconnect layer.
8. The device of claim 1 , further comprising a substrate on which the die is mounted, the substrate comprising a single interconnect layer, and the bond pads being arranged to enable an external coupling to a parallel connection of all of the plurality of light emitting elements using the single interconnect layer on the substrate.
9. The device of claim 8 , wherein the bond pads are arranged to enable an external coupling to a series-parallel connection of all of the plurality of light emitting elements using the single interconnect layer on the substrate.
10. The device of claim 8 , wherein the die includes more than two pairs of bond pads, each bond pad in each pair has at least one truncated corner with corresponding non-orthogonal edges, and each of the plurality of light emitting elements is arranged such that each bond pad has at least one non-orthogonal edge that faces a non-orthogonal edge of a diagonally opposite bond pad.
11. The device of claim 10 , wherein at least one bond pad is arranged within the die such that at least one non-orthogonal edge of the at least one bond pad faces two non-orthogonal edges of two separate bond pads.
12. The device of claim 10 , wherein each pair of bond pads includes a p-type bond pad coupled to a p-layer of the corresponding light emitting element and an n-type bond pad coupled to an n-layer of the corresponding light emitting element.
13. The device of claim 12 , further comprising a substrate on which the plurality of LED devices are arranged, the substrate comprising:
a first conductive segment electrically coupled between all of the p-type bond pads for external connection to a negative node of a voltage source; and
a second conductive segment electrically coupled between all of the n-type bond pads for external connection to a positive node of the voltage source.
14. The device of claim 12 , further comprising a substrate on which the plurality of LED devices are arranged, the substrate comprising:
a first conductive segment configured for electrical coupling of at least one n-type bond pad to a negative node of a voltage source;
a second conductive segment configured for electrical coupling of at least one p-type bond pad to a positive node of the voltage source; and
at least one third conductive segment directly coupled between a respective n-type bond pad of a light emitting element to a respective p-type bond pad of a separate light emitting element.
15. The device of claim 12 , further comprising a substrate on which the plurality of LED devices are arranged, the substrate comprising:
at least one first conductive segment configured for electrical coupling of at least one p-type bond pad to a positive node of a voltage source;
at least one second conductive segment configured for electrical coupling of at least one n-type bond pad to a negative node of the voltage source; and
a third conductive segment electrically coupled between all other p-type and n-type bond pads.
16. The device of claim 1 , wherein the bond pads are situated with a separation distance that accommodates manufacturing tolerances with respect to interconnect patterns on a substrate on which the plurality of light emitting elements are to be mounted.