Methods are provided for preparing nucleic acid arrays on a support. An introducer sheath 40 is introduced into a vein and an optical fiber 12 is introduced through the introducer sheath until a first marking 45 on the optical fiber 12 indicates that the distal end of the optical fiber 12 is substantially in alignment with the distal end of the introducer sheath 40. Furthermore, a plurality of storage capacitor conductors are formed to be connected to the drain electrodes and to overlap an adjacent gate line.