The controller for a brushless motor controls motor current by executing updates of applied voltage to a coil in accordance with rotational position of a rotor, the target current, and the actual current flowing through the coil. Each character is displayed in a frame having a predetermined size. Preferably, the lubricant pump seal further comprises a fluid communication passage between a space in the lower clearance and a lubricant reservoir or interior space of a cowling. Embodiments of pixel circuits employing this driving scheme are exemplified in this disclosure. In particular, ion implantation of nitrogen in the gate sidewall region of the device can provide such control. The shelter includes a lower rigid shell having a central portion surrounded by a channel for receiving the bottom edges of walls of the wall unit so the lower shell forms a floor of the shelter.