They aren’t that much more advanced, it’s just a combination of specs demand and available tech.
Phone screens need to be usable in sunlight, so they require high brightness and contrast. They are small, so it’s easy to place backlight. They aren’t used for color-accurate or prolonged work, so they don’t need to have accurate colors and are often oversaturated to stand out.
TVs and monitors are looked at for extended periods of time, so they need to be eye-safe with comfortable colors; if used for work, they also have to provide accurate colors which are often muted compared to devices tuned for “eye candy” . Large surface area makes placing and powering backlight more demanding.
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