The contrast looks washed out. If there isn't anything going on with the display, try a different color profile.
System Preferences > Display If you have calibration software, that should help.You can try a few profiles in the list, sRGB would be a good start. But Digital Dog, D. Fosse or neil barstow, colourmanagement net have this game down better than I do and can likely help you here.
I uncheck "Automaticlly adjust brightness" and use my own setting.
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