I'm looking to understand exactly why a monitor with higher number of pixels per inch (albeit slightly so), than the standard 27" iMac, cannot produce image that is at least just as sharp as images on the iMac.
The monitor in question is the Philips Brilliance 4K Display BDM4065UC/00. Being a 39.56" UHD screen, it runs at a native resolution of 3840 x 2160, resulting in a PPI around 111.
Compare that to the standard 27" Apple Display/iMac, which at a native resolution of 2560 x 1440, has a PPI of 109.
I understand these two displays are built by different manufactures and use different technologies. However, as someone who doesn't understand much about the internals of displays, I'm struggling to understand why the quality and crispness of the image on my 40" Philips monitor cannot match that of the iMac's, despite the higher PPI.
And by quality of image, I'm not limiting this to text-rendering alone. OS X does allow changing the level of font smoothing by overwriting the
AppleFontSmoothing defaults, but no amount of fiddling with the values can resolve the issue, and besides, the issue isn't just about text anyway (e.g. it could be the image of a text). It simply appears more pixelated, everywhere.
I'm using a Mini-DP to Mini-DP cable, running at full resolution, and 60Hz frequency.
Can anyone shed some light please? Can anything be done about it?
I've found out that when connected using HDMI instead of MiniDP, the rendering is improved. Unfortunately it only runs at 30Hz on HDMI, so that's not a solution. It may not be easy to see the difference when paying attention to the pixels, but the subtle difference makes a huge difference in readability during normal use. Open the pictures in full size using two different tabs, and flick between them, you should be able to see the difference. Can you see the hues around the edges of text? I think that's what's messing with my eyes.
I guess that's the subpixel antialiasing not working so well with MiniDP. I set
AppleFontSmoothing to 0 to turn off subpixel antialiasing. Not much of an improvement.
I've tried 3 different DP cables, all with the same result. Any more ideas and suggestions?