The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 2004
Filed:
Jan. 23, 2003
Han-Kun Hsieh, Miaoli, TW;
Wei-Feng Lin, Hsinchu, TW;
Silicon Integrated Systems Corp., Hsin chu, TW;
Abstract
A flip chip assembly process forming an underfill encapsulant. The method includes providing a chip having an active surface and a plurality of conductive bumps arranged in array with a predetermined bump pitch thereon, providing a substrate having a surface, having a die-attaching region, having a plurality of pads with previously formed solder paste thereon, arranged in array with a predetermined pad pitch the same as the active surface, forming an encapsulant in the die-attaching region excluding the pads, using a stencil and screen printing, and attaching the chip onto the substrate resulted from one-to-one joining the conductive bumps and the pads. A tool forming an underfill encapsulant is includes a stencil having at least one printing region, including a plurality of openings, a plurality of covers arranged in array with a predetermined cover pitch, and a plurality of connecting devices, connecting every two neighboring covers, or each cover with other regions of the stencil.