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:
Dec. 12, 1978
Filed:
Mar. 23, 1977
Toshitaka Hara, Hitachi, JP;
Hitachi, Ltd., , JP;
Abstract
A system for controlling display of characters on partitioned regions of a CRT display surface comprising a refresh memory having a capacity enough to store application display data for exhibiting application display on the entire area of the CRT display surface, and a special display data memory storing special display data for exhibiting special display on a limited specific region, for example, the lowest and second lowest display line portions of the CRT display surface to be pointed by a light pen. In the system, elements including a data selector, a comparator, a register and a flip-flop are provided to switch over the data input to the CRT unit so that, when the special display is not required, the data stored in the refresh memory are solely read out to exhibit the application display on the entire area of the CRT display surface, while when the special display is required, the data stored in the special display data memory are read out to exhibit the special display on the specific display region during scanning of this specific display region of the CRT display surface.