Wafer level MEMS packaging
First Claim
Patent Images
1. A device packaging element comprising:
- a dielectric lid;
said dielectric lid comprising at least one of;
an insulating layer and a conductive layer;
said dielectric lid suitably adapted for effectively enclosing a MEMS device on a device substrate, wherein engagement or said dielectric lid with said device substrate defines a MEMS device enclosure; and
said dielectric lid suitably adapted to effectively shield said MEMS device from at least one of electromagnetic (EM) energy incident to said device enclosure and leakage of EM energy from said device enclosure.
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Abstract
An exemplary method and apparatus for MEMS device wafer level and/or array packaging comprises inter alia an EM shielding array of dielectric lid elements (340) sealed to a MEMS device die array (300) to produce a sealed MEMS device package array (330). Disclosed features and specifications may be variously controlled, adapted or otherwise optionally modified to improve hermetic sealing and/or EM shielding for any MEMS device. An exemplary embodiment of the present invention representatively provides for wafer level packaging of RF MEMS switches prior to device singulation.
127 Citations
29 Claims
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1. A device packaging element comprising:
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a dielectric lid;
said dielectric lid comprising at least one of;
an insulating layer and a conductive layer;
said dielectric lid suitably adapted for effectively enclosing a MEMS device on a device substrate, wherein engagement or said dielectric lid with said device substrate defines a MEMS device enclosure; and
said dielectric lid suitably adapted to effectively shield said MEMS device from at least one of electromagnetic (EM) energy incident to said device enclosure and leakage of EM energy from said device enclosure. - View Dependent Claims (2, 3, 4, 5)
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6. An EM shielded MEMS device package, comprising:
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a device die comprising a MEMS device;
a dielectric lid, wherein said dielectric lid comprises a metal layer;
said dielectric lid suitably adapted for effectively enclosing said MEMS device on said device die; and
said dielectric lid suitably adapted to effectively shield said MEMS device from at least one of EM energy incident to said device package and leakage of EM energy from said device package. - View Dependent Claims (7, 8, 9, 10)
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11. A MEMS device array package, comprising:
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an array of device dies, each die comprising a MEMS device;
an array of dielectrics lids;
said lid array suitably adapted for effectively enclosing said MEMS devices; and
wherein said dielectric lids include conductive layers;
an array of seals;
said seals disposed substantially between said dielectric lids and said device dies to form an array of discretely sealed MEMS device elements in a package array; and
said dielectric lids suitably adapted to effectively shield said MEMS devices from at least one of EM energy incident to said sealed MEMS devices and leakage of EM energy from said sealed MEMS devices. - View Dependent Claims (12, 13, 14)
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15. A method for MEMS device packaging, comprising the steps of:
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providing a device die comprising a MEMS device;
providing a dielectric lid;
said dielectric lid comprising at least one of;
an insulating layer and a conductive layer;
said dielectric lid suitably adapted to effectively shield said MEMS device from at least one of EM energy incident to said device package and leakage of EM energy from said device package; and
hermetically sealing said dielectric lid to said device die so as to form a substantially enclosed MEMS device package. - View Dependent Claims (16)
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17. A method for MEMS device wafer level packaging, comprising the steps of:
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providing at least an array of device dies, each die comprising at least one MEMS device;
providing an array of dielectric lids wherein said dielectric lid array elements comprise at least one of;
an insulating layer and a conductive layer;
providing at least an array of seals, each of said seals disposed substantially annularly around each of said MEMS devices in said die array such that each of said device die elements is substantially peripherally bounded by at least one of said seals;
hermetically sealing said dielectric lid to said device die array elements so as to form discretely sealed MEMS device elements in a wafer package array; and
said dielectric lid suitably adapted to substantially shield said MEMS devices from at least one of EM energy incident to said sealed MEMS device elements and leakage of EM energy from said sealed MEMS device elements. - View Dependent Claims (18, 19)
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20. A method for making an EM shielding package lid suitable for wafer level MEMS device packaging, comprising the steps of:
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providing a dielectric lid substrate;
depositing a shielding metal layer over said substrate;
wherein said shielding metal layer substantially shields EM energy;
depositing at least one layer of photoresist over said metal layer;
patterning said photoresist to at least partially expose a window to one of said metal layers;
electroplating at least a solder wettable material into said exposed window;
at least one of;
electroplating solder over said solder wettable metal and stripping said photoresist to substantially expose at least a portion of a metal layer;
at least one of;
stripping said photoresist to substantially expose at least a portion of a metal layer and etching an exposed metal layer; and
at least one of;
optionally etching an exposed metal layer and depositing solder over said solder wettable metal. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A method for MEMS device packaging, comprising the steps of:
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providing a plurality of MEMS devices;
providing a substrate with an array of device die recesses;
said device recesses annularly defined by peripheral frames, said device recesses suitably adapted for disposing said MEMS devices therein;
providing an array of dielectric lids comprising an insulating substrate with at least an array or cells;
said insulating substrate cell array defining a plurality of EM shielding lid regions, said substrate cell array lid regions further comprising an array of peripheral frames;
depositing at least one metal film layer over said insulating substrate;
lithographically processing said insulating substrate to expose said lid region peripheral frames;
depositing a solder-wettable material to a desired thickness over at least one of said device cell peripheral frames and lid region peripheral frames;
depositing solder to a desired thickness over said solder-wettable material;
aligning at least one of said wafer cell array and said insulating substrate array; and
reflowing said solder to seal said device die cells to said lid cells. - View Dependent Claims (27, 28, 29)
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Specification