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Issue: Fix Contrast in LCD display

I have a Nokia 5110 84x48 pixels monochrome LCD (http://www.sparkfun.com/products/10168) attached to a Netduino Plus, as indicated in this Wiki post: Nokia 5100 LCD
I am using the Driver available there (thanks Omar!), and I can successfully display text and bitmaps, and control the backlight.

The problem that I am having is with readability of the display: The "off" pixels are too dark, specially when looking directly straight to the screen. In order to be able to read, you have to look at the screen at a 30-60 degree angle. I assume it must be a contrast issue, but I have no idea how to tweak the contrast in this device. Any pointers are appreciated.

Attached is a screenshot of the issue.