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A low cost and high speed character generator is provided which is capable of meeting the requirements of future cathode ray tube (CRT) or flat panel displays.
English (United States)
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Programmable Character Generator For Displays
A low cost and high speed character generator is provided which is capable
of meeting the requirements of future cathode ray tube (CRT) or flat panel
In the operation of this programmable character generator for displays each
character or pattern is stored in a small CCD (charge- coupled device) matrix in
serial-parallel-serial organization. The size of the matrix is determined by the dot
matrix requirements, e.g., 9 x 16 character box for alphanumeric display or 100 x
100 for Chinese or Japanese characters. The memory organization is shown in
the diagram which is the standard serial-parallel-serial CCD organization.
The pattern shown in the diagram is upside-down character "A". When the
address for character "A" is decoded, the stored information is read out serially.
The timing can be arranged so that the read out of each slice is synchronized
with the horizontal scan of a CRT display or the horizontal line counter of a flat-
panel display. The diagram is applicable to other patterns such as Chinese
characters where the matrix may be as large as 100 x 100.
This design has a number of advantages. No parallel to serial conversion is
required as is the case for a read-only store. It is programmable. It is low cost
due to the higher bit density of CCD. It can be built-in on the same chip for a
CCD message buffer store. Finally, it is high speed because of CCD serial