Why are the centers for upper case and lower case O's filled in the LCD display (on a CP4, among others)? For lower case o's, there's not a resolution or readability problem, because the e's look perfectly normal.
For upper case O's, it could be misread as a zero, except the display renders zeroes with a slash through them. So what appears to be an O is clearly an O.
I would love to hear an explanation if anyone has one.
Thanks – and apologies for such a trite question,