A PZT unimorph actuated, continuous transferred membrane comprises a controllably deformable mirror. The recording head includes a dot formation element array, and the platen holds a recording medium opposite the recording head. If a failure can be detected at both end nodes, the channel failure messages are transmitted from both end nodes the moment they detect failure without any further waiting. In some embodiments a drain extension extends from on and uppermost surface of the drain toward the gate foot along the substrate. Consequently, it is possible to provide a liquid crystal display panel upon which intermediate functional inspection can be easily performed even if it is a COG type liquid crystal display panel on which a fairly large number of extraction electrodes exist.