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US 2014/0191257 A1Published application
Electronic devices with yielding substrates
AssigneeCooledge Lighting Inc.
InventorsMichael A. Tischler, Philippe M. Schick, Ian Ashdown, Calvin Wade Sheen, Paul Jungwirth
Life of this patent
Estimating the term…
Abstract
In accordance with certain embodiments, a semiconductor die is adhered directly to a yielding substrate with a pressure-activated adhesive notwithstanding any nonplanarity of the surface of the semiconductor die or non-coplanarity of the semiconductor die contacts.
Claims37
-62. (canceled)
An electronic device comprising:
- an inorganic light-emitting diode (LED) having first and second spaced-apart contacts;
- a flexible substrate having first and second conductive traces on a first surface thereof in a bonding region, the first and second conductive traces being separated on the substrate by a gap therebetween;
- and
- disposed on the substrate, control circuitry electrically connected to the LED,
- wherein (i) the first and second conductive traces comprise at least one of silver, gold, aluminum, chromium, copper, or carbon, (ii) the first and second contacts are adhered to and in electrical contact with, respectively, the first and second conductive traces via an anisotropic conductive adhesive (ACA) electrically connecting the first contact only to the first trace and the second contact only to the second trace, and (iii) a portion of the ACA is disposed in the gap and substantially isolates the first contact from the second contact.
2 more elements
A method of forming an electronic device, the method comprising:
- providing a flexible substrate having first and second conductive traces on a first surface thereof in a bonding region, the first and second conductive traces being separated on the substrate by a gap therebetween;
- providing an inorganic light-emitting diode (LED) having first and second contacts;
- providing a pressure-activated adhesive material between the first and second contacts of the LED and the first and second conductive traces;
- applying pressure to at least one of the flexible substrate or the LED, thereby establishing electrical connection between at least one of (i) the first contact and the first trace or (ii) the second contact and the second trace, but without electrically bridging the traces or the contacts, such that the LED extends across the gap between the first and second traces,
- wherein after the electrical connection is established, the substrate comprises a local flexing or a local deformation for maintaining electrical contact between the contacts and traces during operation of the LED.
2 more elements
Dependencies are inferred from the claim text.