A material dispenser for receiving a material container and for dispensing material from the container is disclosed. An embodiment includes the ability for a Virtual Machine Monitor, Operating System Monitor, or other underlying platform capability to restrict memory regions for access only by specifically authenticated, authorized and verified software components, even when part of an otherwise compromised operating system environment. If the main storage device still holds image data to be processed, then an error signal is sent to a device from which the photography command is issued. The electrically conductive material is a semiconductor material. The apparatus also includes a display device, which is coupled to present information on the transparent panel responsively to the medical procedure. The liquid crystal driver generates a negative grayscale voltage corresponding to the negative grayscale signal using a resistance voltage divider circuit, the maximum voltage, and the minimum voltage.