According to one embodiment, a display device includes an insulating layer, a display unit, and an organic EL layer. Pullers are described that have a high power to weight ratio, and a high power to volume ratio. Some embodiments of these techniques may also permit the inclusion of advantageous security features, such as authentication via public certificate to detect man-in-the-middle attacks and the inclusion of nonces to detect replay attacks, without increasing the number of messages involved in the initiation of the communication session. When a second X-ray focal spot is arranged at the position apart from the first X-ray focal spot by a predetermined distance, the CoK X-ray emitted from the second X-ray focal spot is reflected at the same reflecting surface to become a parallel beam going out. When the static contact and the second dynamic contact of each first switch are connected to each other, the computer interface is disconnected to the peripheral equipment interface, the static contact of the second switch is capable of selectively connected to one of the dynamic contacts of the second switch, to selectively test a signal output from a corresponding pin of the computer interface. Also provided herein are vectors and host cells comprising those nucleic acid sequences, chimeric polypeptide molecules comprising the polypeptides of the present invention fused to heterologous polypeptide sequences, antibodies which bind to the polypeptides of the present invention and to methods for producing the polypeptides of the present invention.