Hi Yohan, welcome to the forums
This is a relatively common problem with laptops as the screens are generally far too bright and don't display that many colours (in comparison to more advanced screens).
The easiest thing to try is to turn down the brightness of your laptop screen and see if it helps at all. Have a look at
this on your laptop and on your PC. For a properly calibrated monitor you should be able to see a difference between the colour of all the grey wedges across the top and you should be able to see the different shaded boxes in the black and white "i" things.
Try adjusting the brightness and contrast of your monitors so that you can see as many of the different shades as possible. You're never going to see all of them on a laptop and you'll probably never see all of them on a "normal" PC monitor either but it should help...
It also depends on what sort of image files you're using and what software you're viewing the images in.