| 摘要 |
Techniques for displaying messages on top of a vehicle are disclosed. Although useful in many other areas, the techniques are particularly suitabl e for taxicab. According to one aspect of these techniques, a display unit is mounted on top of a vehicle. The display unit includes at least two display panels faci ng outward respectively. The display unit is controlled by a computing device t o display various messages. In one embodiment, the vehicle is provided a Globa l Positioning System (GPS) that determines a location of the vehicle. Coupled to the GPS, the computing device sends the location information of the vehicle to a base station and receives returned information from the base station in accordanc e with the location information. The returned information, at least some of which a re location based, is locally processed for suitable messages on the display panels. In another aspect, illumination of the display messages varies by a light sensor in response to intensity of ambient lights.
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