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Booklights are a thing.

Cheap, modular, long battery life, effective.

https://duckduckgo.com/?q=booklight&ia=images&iax=images

There's evidence that lack of exposure to sunlight increases risk of myopia. But emissive displays are typically dimmer than sunlit objects, even at full brightness. If insufficient brightness is a concern, you're better off using reflective displays outdoors.

People often read at night before going to sleep. If reading in the Sun was a requirement, one could do that with physical books too. However, most reading happens indoors and for that an iridescent panel screen such as that on an iPad with full gamut of colors is suited better.

[Citation needed]