Abstract:
A polyamic acid-based composition includes: a polyamic acid A prepared by a process including reacting an aromatic tetracarboxylic dianhydride and an aromatic diamine; and a polyamic acid B prepared by a process including reacting an aliphatic tetracarboxylic dianhydride, an aromatic diamine having a side chain, and a non-aromatic diamine. A liquid crystal orienting film is formed by a process including: preparing a mixture containing the aforesaid polyamic acid-based composition and a solvent; coating the mixture onto a substrate so as to form a film on the substrate; and heating the film so as to convert polyamic acid of the polyamic acid-based composition into polyamide.
Abstract:
A manufacturing method of electronic packaging includes the steps of preparing a metallic plate having an array of cover portions, soldering the metallic plate to a circuit board having encapsulated areas corresponding to the cover portions and employing a cutting process to obtain multiple electronic packages. Thus, the invention has the advantages of low cost and high efficiency
Abstract:
A MEMS microphone module includes a substrate and a conducting lid covered on the substrate to define a chamber therebetween for accommodation of a MEMS chip and an ASIC chip. A ground layer of the substrate is electrically coupled to a protrusion of the conductive lid to form an EMI shielding structure. By this way, an EMI shielding effect can be applied by the EMI shielding structure to the MEMS chip and the ASIC chip.