Epaper frontlighting

Hi All,

I am experimenting with a front lit epaper bedside clock using a 2.9inch waveshare module. I'm not happy with my first attempt at illuminating the screen using led lighting seeping from gaps between the screen and enclosure - see attached

Does anyone know how kindle front lighting works and could it be replicated using commonly found materials (i.e. cheap)?

Googling reveals a number of gameboy advanced front lighting replacements for around $15, but my epaper screen is too wide!

Any ideas?