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Use UTF8 Block Characters to increase "Resolution"
You could use the utf8 block chars such as U+2596
> U+259F
to both increase the "resolution" by dividing each character into 4 quadrants, and having control of them individually, although you would be giving up the ability to dither with U+2591
> U+2593
.
http://www.fileformat.info/info/unicode/block/block_elements/images.htm