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The OptiFiber display is a VGA 640x480, 128 Color Screen,
The viewable size of the screen is 120 mm x 90 mm (approx. 4.75 x 3.56)
The dot pitch (assuming we want to talk about a "dot" as a group of red / green / blue pixels) would be 0.189 mm or about 0.0075" per dot.