A method of reconfiguring a stream process in a distributed system includes the initial step of managing a stream process including one or more operators. A session may be established between a client and a first database server to handle a database query for the client. For each of the pixel electrodes, a first pixel electrode surface is substantially flat and parallel to the first electrode and has a first distance relative to the first electrode and a second pixel electrode surface is substantially flat and parallel to the first electrode and has a second distance relative to the first electrode which is different than the first distance. Then, second insulating film is polished.