Nippondenso Co., Ltd.

Takeshi Yamada

Kenzo Ito

Hidetoshi Fujimoto

Kazunori Hanabusa

Norihisa Fujii

Tomoyasu Fujii

A map display apparatus displays a map of a desired district in accordance with stored map data. The apparatus includes a recording medium storing map data of a map to be displayed in a manner that the whole area of the map is divided into a plurality of districts and the map data are successively stored starting from the nearest district, a display district selecting device for selecting the desired map district to be displayed, a control unit for reading the map data of the selected district from the recording medium and generating a control signal for displaying the thus read map data, and a display responsive to the control signal to display the map of the selected district. The map data of each district includes duplicate map data of the boundary parts of the adjoining districts. Map data of adjacent districts are stored in adjacent memory locations. Thus, the map data of the desired district can be displayed quickly.

Map display apparatus storing data of physically adjacent map sections

In a map display system, map-forming data necessary for display of a display area and character data representing display areas are stored in a map data memory. A display area commander reads map-forming data indicating a specified display area out of the map data memory, and produces a display area instruction. A display character commander selects character data for a given point of the specified display area designated by the display area designation commander, and produces a display character instruction. On the basis of the display area instruction from the display area commander and the display character instruction from the display character commander, a map of the specified display area and characters in the specified display area are displayed on a display.

Growing community of inventors

Seto, Japan

Takeshi Yamada