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Patent Searching and Data


Title:
DISPLAY DEVICE FOR NAVIGATION
Document Type and Number:
Japanese Patent JPH06309591
Kind Code:
A
Abstract:

PURPOSE: To reduce the timewise omission of navigation information accompanying the rotation of a map by performing display dividing display areas forming regular triangles and rotating map information only by transferring data.

CONSTITUTION: A display means is divided into areas by each 60 degrees, display is performed and rotation every 60 degrees is performed only by transferring the data. In the case of rotating a display screen by 60 degrees counter clockwise, a control means 15 transfers the internal data of a storage means A8 through a data bus to the storage means G14 first. Then, the internal data of the storage means B9 are transferred through the data bus to the storage means A8. Thereafter, similarly, the data of the storage means C10-F13 are transferred and the internal data of the storage means G14 are transferred through the data bus to the storage means F13 finally. By the above-mentioned data transfer, the information of the display means is rotated by 60 degrees counter-clockwise. Time taken by the coordinate transformation of the data is not required and the timewise omission of the navigation information can be reduced at the time of rotating map data in a navigation device.


Inventors:
Kume, Chikao
Application Number:
JP1993000096384
Publication Date:
November 04, 1994
Filing Date:
April 23, 1993
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G01C21/00; G08G1/0969; G09B29/10; (IPC1-7): G08G1/0969; G01C21/00; G09B29/10
Attorney, Agent or Firm:
粟野 重孝