Unless in your house on a table in a controlled environmental light environment, and set so the screen is close to 90 degrees from your path of vision, a laptop will provide varied perceptual results and image editing that will subsequently vary. Most serious digital photographers who need to use a laptop usually add a desktop LCD display to do digital photographic editing.

The resolution of an LCD screen is fixed and set in the screen production, so being a digital device using it at different than native resolution greatly reduces the quality of reproduction. 72 dpi was the standard for old CRT's of long ago. But whatever the screen resolution, the 300dpi if an image file is always displayed at less unless maybe it is a postage stamp size mage and configured to fill the LCD screen size.