What are photoconductive materials?

Question

Electronics

Is there a substance that can change its resistance or become a conductor (without a specific direction) if you shine a light on it?
What I mean. Abstractly, I need to connect some two points on the plane with a wire, and I don’t know where these points are. I thought to take the LCD display and put it on the plate where this substance will be. By projecting lines onto a screen, it will be possible to form electrically conductive tracks. But then I ran into an obvious ignorance of what kind of substance it could be.

Answer 1

There are quite a lot of such materials, photoresistors .
It is impossible to determine which one is suitable for your tasks without delving into the details.

take the lcd display and put it on the plate

I wang that it won’t work, because the resistance will not fall to zero, and will strongly depend on the intensity of the radiation. And the LCD matrix, not that it shines super-strongly. If you shine with some powerful projector, then maybe something will come out, with fairly short "tracks".

Answer 2

photolithography