Dell STUDIO XPS M1640 Setup Manual page 70

Basic Specifications
Display
Luminance (with ETED)
Studio XPS 300 cd/m2 (typical)
1640 250 cd/m2 (minimum)
(WLED/RGBLED)
300 cd/m2 (typical)
270 cd/m2 (minimum)
(FHD WLED)
Studio XPS 300 cd/m2 (typical)
1645/1647 250 cd/m2 (minimum)
(WLED/RGBLED)
300 cd/m2 (typical)
270 cd/m2 (minimum)
(FHD WLED)
68
Display
Pixel pitch 0.2588 mm (WLED)
0.1840 mm (RGBLED)
0.1792 mm (FHD WLED)
Controls brightness can be
controlled through
keyboard shortcuts (see
the Dell Technology Guide
for more information)
Keyboard (backlit)
Number of keys 86 (U.S. and Canada); 87
(Europe);
90 (Japan)
Layout QWERTY/AZERTY/Kanji