It's a matter of not enough dots to have dots in all the right places.
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Imagine three lines have to be shown by turning on the dots above.
The top and the bottom row line right up with rows of dots so that's easy.
The middle line though goes right in between two rows of dots, so the
screen would light up the rows of dots on either side of the desired
position partially to simulate the line where it can't actually draw
one. You'd get two crisp black lines with a fuzzy grey line in between.
Patrick
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