[tencentshill]

This is probably an LCD panel with the polarizer removed, so the UI will require a bright/strong source of light behind it.

[mikestew]

Going on ten years ago I saw an early transparent OLED screen (TV-sized). It didn’t need a strong light source behind it. Could be those got cheap enough in a small size to put in a $29 camera.

[Groxx]

Without the polarizer, you wouldn't be able to see anything. Unless wearing polarizing sunglasses.

But yea, you'd need light on the subject you're looking at it through to take pictures too.