David, I think the one you should look at for comparison is the screenshot of my 13" Dell Laptop, since it too has builtin graphics (no dedicated graphics card).
I think this is a limitation of your builtin graphics and there's not much that can be done to improve it.
I read through the posts that Josh suggested and you might want to try this to see if your specific graphics reacts to this setting. DataCAD should be closed before editing the dcadwin.ini file, and change the value to a positive (1 or greater) to see if it 'thins' the display. Negative numbers may make lines thicker.
I thought I was comparing to your 13" Dell, but maybe I have the various screenshots confused.
I tried changing the Logical Pen Width Adjustment to 2, but it didn't seem to make any discernible difference. Should it have? What does changing that do?
At this point, I don't know what to expect in term of display. Am I being unrealistic in expecting the display to be sharper? It seems to me that I didn't see this kind of blurriness until my recent Dells, but maybe it's always been like this. The old Asus looks significantly better, though still not great. OTOH, Clay said that everything looked too thick on the Dell, including lines, display grid, etc., not just text.
In a series of tests just now, Calibri (TTF) looked the best of the bunch, both on screen and in PDF. I guess I'll make that my standard, at least for now, and just deal with not being able to read text well unless I zoom in.
I also have to play with hatches as many of those were printing too thick/dark in spite of changing pen widths.
All in all, this is really frustrating. I don't recall having these issues a few years back when I was using DataCad more often and before having these Dells. It's close to a deal breaker in continuing to use DataCad - and I've been a user and booster of DataCad since v5!
The screenshot from my 13" monitor is smaller and more blurry.
From what I read that Logical Pen Width Adjustment is supposed to change the DISPLAYED lines to either thinner (positive number) or thicker (negative number) but it may be specifically for 4K monitors.
I think we have learned that builtin graphics can vary widely as to the display quality. I wish we could have found a fix for your display issue.