| 摘要 |
PURPOSE: A keyboard is provided to allows a user to see keys well in a dark place by emitting key-characters. CONSTITUTION: The keyboard includes a switch, light-emitting elements installed in inner spaces of keys, a power supply for supplying power to the light-emitting elements, and a controller for controlling the power supply to the light-emitting elements in response to turn-on/off of the switch, thereby allowing a user to see key-characters well in a dark place without any light.
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