A good laptop screen is not very dependent on the viewing direction. It’s mostly the cheap TN screens which are really bad at this. Smartphone screens are mostly IPS and OLED, both of which are much less dependant on the viewing angle. And in addition they mostly just dim at extreme angles instead of distorting the colors.
All the above are various technologies, with TN and ISP being LCD-based. If you want to know more about any of those, you can ask here (or search the internet if you want).
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