Abstract: In at least one embodiment, an electrooptic element is connected between a first power supply wire and a second conducting terminal of a driving transistor. A first conducting terminal of the driving transistor is connected to a second power supply wire. The second conducting terminal of the driving transistor is connected through a first switching transistor to a control terminal of the driving transistor. A control terminal of the first switching transistor is connected to a control wire. The control terminal of the driving transistor is connected through a first capacitor to a node. The node is connected through a second switching transistor to a data line. A control terminal of the second switching transistor is connected to a scanning line. The node is connected through a second capacitor to a third power supply wire. The constitution realizes a pixel circuit that allows freely setting a period for compensation of the threshold voltage of a driving TFT and further reducing power consumption.

Abstract: A tap is designed in such a way that chips are aspirated and discharged forcibly so that the pollution of the environment can be prevented and the cleaning can be simplified. The tap includes an intake hole, and the intake hole includes openings. Accordingly, air intake is performed through the intake hole, so that the chips generated in the cutting can be aspirated from the openings forcibly. Therefore, because the chips can be discharged without using cutting fluids, pollution of the environment can be prevented. Further, because the chips can be aspirated from the openings, and the chips aspirated from the openings can be discharged from the intake hole of the tap, the chips are not scattered on the work piece, and thus a cleaning process of the work piece can be simplified.

Abstract: In one embodiment of the present invention, a driving TFT, a switching TFT, and an organic EL element are provided in series on a first path which connects a power source line and a common cathode. The switching TFT is provided on a second path which connects a node between the driving TFT and the switching TFT and a source wiring line. Further, the switching TFT is turned ON so as to cause the second path to be conductive and the switching TFT is turned OFF so that a branch extending from the node on the first path toward the organic EL element is caused to be non-conductive. As a result, it is possible to realize a display device and a driving method thereof whereby the contrast can be made higher than a conventional pixel circuit and deterioration of an electro-optical element can be suppressed.

Abstract: A drill is capable of forcibly aspirating and discharging chips to prevent environmental contamination as well as to simplify cleaning the chips. The drill has an intake hole and an opening formed therein so that the aspiration takes place through the intake hole and the chips generated in the cutting process can forcibly be aspirated up from the opening. Because the chips can be discharged without the use of the cutting fluid, the drill is useful for preventing environmental contamination. Moreover, as the chips are forcibly aspirated up from the opening and discharged through the intake hole, the chips are not scattered around a workpiece to be done and cleaning the chips can become simple and easy.