A method and apparatus are used for detecting a radio link failure and a post verification process. The receiver then retrieves one or more of the past measurements, and combines it with current measurements, to predict what the channel quality will be at some future time and derive a predictive channel quality indicator. Redundant systems, such as redundant controllers, power sources, motor actuators, and alarms, may be provided. The data line is spaced apart from the light blocking pattern by a second distance, and the data line is disposed under a region between the pixel electrodes. The vapor gas flows to the gas suction face naturally, bringing about improved gas collection efficiency.