Arrangements of multiple-chip light-emitting diode packages
Light-emitting diode (LED) packages, and more particularly arrangements of multiple LED chips in LED packages are disclosed. Arrangements include different types, different dimensions, and/or different orientations of LED chips within LED packages and corresponding electrical connections. Further arrangements include individual cover structures having different dimensions for various LED chips to accommodate thickness variations of LED chips and/or thickness variations attributed to different elements of individual cover structures. Different cover structure elements may include lumiphoric materials, antireflective layers, filter layers, and polarization layers. By accounting for dimensional variations between LED chips and/or between cover structures within multiple-chip LED packages, aggregate light-emitting surfaces may be provided with improved emission uniformity.
1 . A light-emitting diode (LED) package comprising:
a submount including a first side and a second side that opposes the first side;
a plurality of metal traces on the first side of the submount;
a plurality of LED chips mounted on the first side and electrically coupled with the plurality of metal traces, wherein:
a first LED chip of the plurality of LED chips is mounted to and electrically coupled with a first trace of the plurality of metal traces, and the first LED chip is further electrically coupled with a second trace of the plurality of metal traces by a wire bond; and
a second LED chip of the plurality of LED chips is mounted to and electrically coupled to a third trace and a fourth trace of the plurality of metal traces, wherein a height of the first LED chip above the submount is more than 25% of a height of the second LED chip above the submount;
a jumper wire bond electrically coupled between the first trace and a fifth trace of the plurality of metal traces, the jumper wire bond extending over the third trace; and
a cover structure that is registered with the second LED chip, the cover structure comprising a support element that is light-transparent to light from the second LED chip, and a height of the cover structure at a planar upper surface of the support element is within 20% of the height of the first LED chip.
2 . The LED package of claim 1 , wherein the jumper wire bond is one of a plurality of jumper wire bonds electrically coupled between the first trace and the fifth trace.
3 . The LED package of claim 1 , wherein the first trace, the second trace, the wire bond, the fifth trace, and the jumper wire bond form an electrically conductive path for the first LED chip that extends along the first side from a peripheral edge of the submount to an opposing peripheral edge of the submount.
4 . The LED package of claim 1 , wherein the height of the cover structure is within 5% of the height of the first LED chip.
5 . The LED package of claim 1 , wherein the cover structure comprises a lumiphoric material and the support element is light-transmissive to light from the lumiphoric material.
6 . A light-emitting diode (LED) package comprising:
a submount including a first side and a second side that opposes the first side;
a first LED chip and a second LED chip arranged on the first side of the submount; and
a cover structure covering a top surface of the second LED chip such that the second LED chip is arranged between the cover structure and the submount, the cover structure comprising a support element that is light-transparent to light from the second LED chip, wherein a height of the first LED chip above the submount is greater than a height of the second LED chip above the submount by at least 25%, and a height of the cover structure at a planar upper surface of the support element above the submount is within 10% of the height of the first LED chip.
7 . The LED package of claim 6 , wherein the height of the cover structure is within 5% of the height of the first LED chip.
8 . The LED package of claim 6 , wherein the cover structure comprises a lumiphoric material and the support element is light-transmissive to light from the lumiphoric material.
9 . The LED package of claim 8 , further comprising a third LED chip arranged on the first side of the submount and an additional cover structure that is arranged on the third LED chip, wherein the height of the first LED chip above the submount is greater than a height of the third LED chip above the submount, and a height of the additional cover structure above the submount is within 10% of the height of the first LED chip.
10 . The LED package of claim 9 , wherein the additional cover structure comprises a lumiphoric material that is different from the lumiphoric material of the cover structure.
11 . The LED package of claim 10 , wherein:
the second LED chip and the lumiphoric material of the cover structure are configured to provide white light that is a mixture of light from the second LED chip and the lumiphoric material; and
the third LED chip and the lumiphoric material of the additional cover structure are configured to provide light that is primarily a single color such that a majority of light that exits the additional cover structure comprises wavelength-converted light.
12 . The LED package of claim 6 , further comprising a light-altering material on sidewalls of the first LED chip and the second LED chip and on portions of the submount that are outside mounting areas of the first LED chip and the second LED chip.
13 . The LED package of claim 12 , further comprising an encapsulant that is arranged on the light-altering material, the first LED chip, and the cover structure.
14 . The LED package of claim 12 , wherein the light-altering material is arranged to entirely extend from the first LED chip and the second LED chip to peripheral edges of the submount.
15 . The LED package of claim 12 , wherein the light-altering material is arranged to only partially extend from the first LED chip and the second LED chip toward peripheral edges of the submount.
16 . The LED package of claim 15 , further comprising a dam on the submount that defines boundaries of the light-altering material.
17 . The LED package of claim 12 , wherein peripheral edges of the light-altering material form a non-geometric shape along the submount.
18 . A light-emitting diode (LED) package comprising:
a submount;
a first LED chip and a second LED chip that are arranged on the submount, wherein a height of the first LED chip above the submount is greater than a height of the second LED chip above the submount by at least 25%;
a first cover structure covering a top surface of the first LED chip, the first cover structure comprising a first support element that is transparent to light generated by the first LED chip; and
a second cover structure covering a top surface of the second LED chip, the second cover structure comprising a second support element that is transparent to light generated by the second LED chip;
wherein the first support element comprises a thickness that is different than a thickness of the second support element, and a height of the first cover structure at a planar upper surface of the first support element above the submount is within 10% of a height of the second cover structure at a planar upper surface of the second support element above the submount.
19 . The LED package of claim 18 , wherein the first cover structure comprises a lumiphoric material.
20 . The LED package of claim 18 , wherein the first cover structure comprises a first optical layer that includes one or more of an antireflective layer, a filter layer, and a polarization layer.
21 . The LED package of claim 20 , wherein the second cover structure comprises a second optical layer that includes one or more of an antireflective layer, a filter layer, and a polarization layer.
22 . The LED package of claim 18 , further comprising a light-altering material on sidewalls of the first LED chip and the second LED chip and on portions of the submount that are outside mounting areas of the first LED chip and the second LED chip.
23 . The LED package of claim 22 , further comprising an encapsulant that is arranged on the light-altering material, the first cover structure, and the second cover structure.