UV light masking and LCD screens
I have thought about this, there are problems. The resolution will go way down because the light will difract around the pixels (I think)

The main problem is the transmission and adsorption of the LCD material itself, which starts to fall off after ~300nm, which may or may not work for your source. This is also dependent on the display and type of glass and LCD chemical, however it is most likely that displays are designed with a UV cutoff because UV is harmful to the eye and not desirable in a screen. 


Source: Cholesteric Liquid Crystal Display With Flexible Glass Substrates


Source: https://pubs.rsc.org/en/content/articlelanding/2012/jm/c2jm14918d/unauth#pnlRelatedContent