Google is your friend for a question like this. I started searching and, surprisingly(?) "cleanroom classes for lcd" produced a lot of relevant sounding hits.
I think try need to refine your question if you want a proper answer. What level would your research be operating at? "Clean" is a relative term (hence the many different classes) If you can afford some failures than you don't need the level of cleanliness of a complex manufacturing process. This link should equip you to make decisions about what you may want. But it's only a start.