A method of making hydrogenated Group IVA compounds having reduced metal-based impurities, compositions and inks including such Group IVA compounds, and methods for forming a semiconductor thin film. The decimating filter used is a Finite Impulse Response filter having a frequency response corresponding to that of a cascade of m SINC filters, wherein m is an integer greater than 1. The fixing member includes a fixing portion fixed on the cooling fan, a first rotary portion rotatably connected to the fixing portion, and a second rotary portion rotatably connected to the fixing portion. Further, a contact is electrically connected to an exposed surface of the second conductive layer. The pixels are defined by the intersection of a first gate line of the first gate lines and a first data line of the data lines.