Liudrs Phi Shield has a settable backlight as part of his software but there are several pages of stuff to read to find it. I own 3 or 4 of his LCD backpacks and for the lcd control according to john (Liudr) he used the software for the shield to make his serial backpacks. Impressive little things, control a 20 X 4 and read a keypad as well I think he said the ports could also be used for other control stuff as well. Great product but Extremely poorly documented.
Doc