Unit and program for displaying map

Details Unit and program for displaying map Unit and program for displaying map

2007-04-03

2007-04-03

Tung, Kee M. (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics display memory system

Plural storage devices

C345S555000, C345S536000

Reexamination Certificate

active

10636563

ABSTRACT:
The invention provides a map display unit including a first memory for storing map data and a drawing memory for drawing the map data and displaying display-area data and a display. The map display unit includes a unit to read and decompress compressed map data stored in blocks in a data storage medium and to store the decompressed map data in the first memory; a unit to draw the stored map data in the drawing memory; and a unit to determine the display area and to display the display-area data of the drawing area in the drawing memory on the display. When there is no display-area data in the first memory, compressed map data is read and decompressed from the data storage medium by the data decompression unit. The map display unit further includes an environmental change sensor and controllers to vary the color tone of the map data with the environmental change, thereby displaying easily viewable map data.

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patent: A 2001-195052 (2001-07-01), None
patent: A-2001-241965 (2001-09-01), None

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