The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 1998
Filed:
Apr. 04, 1996
Sofmap Future Design, Inc., Tokyo, JP;
Abstract
Fast scrolling of images can be achieved by drawing only the portions that are changed as a result of scrolling. Because there is no need to draw the whole image during scrolling, the scrolling speed can be increased. This method can be applied to bitmap and vector images. A high speed data transfer device can also be used to further increase scrolling speed. This device comprises two memory buffers, a first circuit for communicating data with a hard disk, and a second circuit for communicating data with system memory. The device also comprises a data switching circuit which alternative couples the first circuit to one of the two buffers and alternatively couples the second circuit to the remaining one of the two buffers. As a result, graphic data can be continuously transfer between the hard disk and system memory. Consequently, scrolling can be performed without slowed down by data transfer.