Microelectronic assembly including a transparent encapsulant
US5682066A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1996 |
| Grant date | Oct 28, 1997 |
| Priority date | — |
| Expiry date | Aug 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/857
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A microelectronic assembly (10) includes an integrated circuit die (12) mounted onto a substrate (14) and spaced apart by a gap (30). Solder bump interconnections (32) extend across the gap (30) and physically attach and electrically connect an electrical circuit on the substrate (14) to an electrical circuit on the integrated circuit die (12). The gap (30) is filled with a transparent encapsulant (16) to protect the solder bump interconnections (32). The transparent encapsulant (16) is composed of a polymeric matrix and filler particles dispersed in the matrix. The polymeric matrix and the filler particles have substantially similar indices of refraction, thereby making the encapsulant (16) transparent. The integrated circuit die (12) includes light emitting diodes (18) that transmit light toward the transparent substrate (14) to form a display. The substrate (12) is preferably formed of transparent glass, and the filler particles are preferably formed of a composition similar to the transparent glass substrate (14) to allow light generated by the light emitting diodes (18) to pass through the encapsulant (16) and the substrate (14).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.