If you are ok for the monochrome then this is a 10 megapixel display
http://www.doubleblackimaging.com/products/pacs-displays/10mp-monochrome - it must be pricey because they let ask for a quote and they do not list the price. It is 10 Mega-Pixel LCD with Front Sensors,Backlight Sensor, and Bonded Protective Panel
Screen Type Flat Panel LCD
Recommended Modalities CR, CT, DR, MR, Ultrasound, PACS, Mammography
Diagonal Screen Size (inches) 30"
# of Pixels 10 Mega-Pixel
Resolution (pixels) 4096 x 2560 Portrait
Contrast Ratio (typical) 1000:1
Viewing Angle 170° horizontal & vertical
Brightness 1250 cd/m2
Palette 14 Bit Gradation
Video Inputs DVI
Dimensions H x W x D (inches) 23.84 x 28.95 x 11.89