System for electronically displaying portions of several differe

Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...

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340721, 340723, 364518, 364521, G09G 100

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active

045423768

ABSTRACT:
A system for electronically displaying portions of several different images on a CRT screen comprises: a memory for storing a complete first image as several pixels in one section of the memory and a complete second image as several other pixels in another section of the memory such that the total number of stored pixels is substantially larger than the number of pixels on the screen; a logic circuit for reading a sequence of the pixels at non-contiguous locations in the first and second images and for transferring them, in the sequence in which they are read, to the screen for display with no frame buffer therebetween; the logic circuit for reading including a module for forming non-contiguous addresses for the pixels in the sequence in which they are read with the address of one word of pixels being formed during the time interval that a previously addressed word of pixels is being displayed on the screen.

REFERENCES:
patent: 4197590 (1980-04-01), Sukonick et al.
patent: 4200869 (1980-04-01), Murayama et al.
patent: 4384338 (1983-05-01), Bennett
patent: 4439760 (1984-03-01), Fleming
patent: 4470042 (1984-09-01), Barnich et al.
patent: 4484187 (1984-11-01), Brown et al.

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