A display device, under a digital display mode, performs writing of digital image signals into a static memory circuit while a power voltage of about 3V is applied to the static memory with a panel drive frequency reduced from 60 Hz to 20\u201330 Hz. A laterally medial powering arm irrotatably carried by the ejector arm shaft communicates through the back and extends forwardly to move upon an angulated ramp carried by the bucket tilting arm mechanism to pivot the ejector arms away from the back of the bucket as the bucket is tilted to a horizontal dumping position. The surface-emitting semiconductor element is excited with the first laser light, and emits second laser light having a second wavelength which is longer than the first wavelength. The system works to engage in a fluid exchange which slowly increasesdecreases intraocular pressure until a desired level is reached. Further, a resuming type switch is disposed at a position corresponding to an end of the guide pole, such that when the screen display is lifted up and opened to press the push member of the latch member, the guided pole of the latch member presses the switch and thus the switch is electrically connected to turn the wireless communication online. The system’s call capacity is thus easily scalable based on adding additional processing subracks.