Nicholas24 :
Yes, wait, but my question is: Does screen size affect image quality?
In a manner of speaking.
A 27" inch screen for $500 will be worse quality than a 24" $500 screen.
The expectation is that you pay more the larger a screen gets, so larger screens are priced higher at the same quality. In order for a larger screen to increase in quality, the price generally increases proportionately.
However, the best screens are generally large screens for extreme amounts of money, since it's not worthwhile to market an enthusiast grade $2000 screen at a small size.
What Linkdrive said is also correct.
Resolutions look more detailed on smaller screens. In order to increase detail on a larger screen, a high resolution must be used, further increasing cost.
Simpler version:
TN panel decreases cost and decreases quality.
IPS panel increases cost and increases quality.
Large screen increases cost and leaves quality the same, or;
Large screen leaves cost the same and decreases quality.
High refresh rate has the potential to increase quality when paired with a strong video card, and increases price.
Response time is almost meaningless since companies can play with the numbers however they want anyway.
High resolution increases quality and increases cost, or;
High resolution trades clarity for color accuracy if the cost does not increase.