| 摘要 |
A portable computer is adapted for use with an overhead projector and includes a main body having a keyboard on its upper face and a lid, which is hinged to the rear edge of the main body. The lid includes front and back portions. The front lid portion includes a liquid crystal display, a driver for the display, and a backlight. The back lid portion includes a light diffuser that diffuses light emitted by the backlight. The back lid portion is connected to the front lid portion by a latch, which is only accessible to the user when the lid is in the open position, thereby preventing the inadvertent removal of the back lid portion when the lid is closed against the main body. A switch is also provided that detects the removal of the back lid portion and cuts off the drive current to the backlight in the front lid portion. Since the backlight consumes a considerable amount of battery current, the switch prevents unnecessary battery drainage by automatically switching off power to the backlight anytime the computer is configured in the overhead projection mode, i.e., anytime the back lid portion has been removed.
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