ERIC Number: ED031274
Record Type: Non-Journal
Publication Date: 1969-Jun
Reference Count: N/A
A Novel Solid State Character Generator.
King, Paul Allen, Jr.
This thesis describes a character generator which was built for a refreshed cathode-ray tube (CRT) display and demonstrates the feasibility of displaying high quality dot-matrix characters using the low-band width sinusoidal scan. The CRT used was a low-cost entertainment-quality television tube, and hence had a very poor deflection band width. Settling time for the CRT system was about 10 microseconds. A technique was developed and made operational which displayed a whole dot-matrix character in a time which was less than one settling time of the display system. It is an application of the existing technique called sinusoidal scan to the display of dot-matrix characters. A data compression technique was also invented and implemented. It allows up to a 75 percent reduction in the size of the stored character tables which are normally associated with dot-matrix displays. The technique involves a digital algorithm which fills in dots between given dots in a matrix. This technique proved quite effective in producing good quality characters, and is economically attractive. (Author/RM)
Publication Type: N/A
Education Level: N/A
Sponsor: Council on Library Resources, Inc., Washington, DC.
Authoring Institution: Massachusetts Inst. of Tech., Cambridge. Electronic Systems Lab.