I've done some more tinkering today and think it's as good as
it's going to get, and is totally acceptable. This arrangement really
suits me because of constraints within the case. A LED can now
go under the overhang of the LCD past the end of the driver IC,
which was previously unused space

http://home.clear.net.nz/pages/joecolquitt/led+lcd.html

Had quick play with red LEDs and the new diffuser. Better
illumination but still looks odd (every backlight I've ever seen has
been yellow/green/blue). May suit the right application

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