Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – With housing or contact structure
Patent
1998-05-21
2000-04-11
Tran, Minh Loan
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
With housing or contact structure
257100, 257667, 257783, 257788, 257669, H01L 3300, H01L 23495, H01L 2329
Patent
active
060490942
ABSTRACT:
A low-stress silicon-backed light valve package assembly that includes a matched coefficient of thermal expansion (CTE) substrate with a CTE no greater than 300% of the CTE of silicon, a silicon-backed light valve adhered to the matched CTE substrate by a soft adhesive layer, a flexible circuit adhered to the matched CTE substrate and electrically connected to the silicon-backed light valve, an encapsulant dam surrounding the silicon-backed light valve and a soft encapsulant layer filling the cavity defined by the encapsulant dam. Both the soft encapsulant layer and the soft adhesive layer have a Shore A hardness of less than 5. The combination of a soft encapsulant layer, soft adhesive layer and matched CTE substrate insure sufficiently low mechanical stress levels to avoid the presence of optical interference patterns in the light valve display.
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National Semiconductor Corporation
Tran Minh Loan
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