The present invention provides, in a TFT, a channel region facing a gate electrode through a gate insulating film, a source electrode connected to the channel region and a drain region connected to the channel region on the side opposite the source region that are formed in a polycrystal semiconductor film that was patterned in island forms. The carrier for delivering at least one lytic enzyme to the eye may be but is not limited to the use of an isotonic solution. An amount of exhaust gas recirculated to an engine intake is adjusted differently based on whether the humidity sensor is degraded or functional. The height at which a load is held above a supporting surface is varied by adjusting the relative longitudinal positions of the sleeve and the column. The pixel electrodes and the switching elements are formed on the same substrate, and each pixel electrode is provided in a layer on the substrate, not on a semiconductor layer of the switching element.