A light emitting device comprises a body of a semiconductor material. First and second apertures are defined through the first and second panels in alignment, and a fastener extends through the first and second apertures. The first stage block detects a first bit of a digital code for a time difference between first and second input signals. That is, by obtaining the threshold potential of the inverter, the shift register which operates with almost no effect of variation in characteristics of transistors can be provided. The first blocking structure extends in a second direction intersecting the first direction when viewed from a plan view. The method includes contacting the polymeric material with a solvent formulation which is at a temperature of greater than 100\xb0 C.