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:
Jun. 23, 1987
Filed:
Dec. 20, 1983
Harry Halliwell, Winchester, GB;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and apparatus for continuously updating a display of the coordinates of a light pen as it moves across a display screen involves executing a single iteration of an approximation calculation every refresh cycle of the display. The absolute screen coordinates are updated by the light pen tracking system and converted to application parameters written by the host computer into the display buffer work space. The orthogonal displacements, dx and dy, from a fixed reference point are determined. The distance and direction values from the reference point are converted to character form and inserted in the display buffer.
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