Provided is an image display apparatus including: a vacuum container having an electron source enclosed therein for displaying an image; an ion pump communicating with the vacuum container for discharging air therefrom and decreasing pressure therein; and a resistor connected in series with the ion pump with respect to a power supply for driving the ion pump. The communication interface can be configured to use a first logical protocol where the digital camera appears to the host computer as a data storage device in order to install the digital image sharing software on the host computer. A charge storage device stores charges and is connected to each gate of the MOS transistors. In use, the icemaker adapter resides on top of a beverage dispenser and above a storage chamber of the beverage dispenser. Changes in the page tables are also detected and reflected in the caches of the cache group to maintain the caches up-to-date.