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I'm not asking the diagonal values, but the length and breadth ones of the Nexus 7. And only of the LCD screen, not the entire hardware.

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4 Answers

up vote 6 down vote accepted

The screen size is 151mm * 94mm

http://forum.xda-developers.com/showthread.php?t=1760938

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You can always use some mathematics to obtain screen size:

X = sqrt ( Z^2 / (1 + (VR/HR)^2) )

where:

sqrt = Square Root √‾‾‾

X = screen width

Z = diagonal screen size (7" for Nexus 7)

VR = vertical resolution

HR = horizontal resolution

which for Nexus 7, we have:

Z = 7"
VR = 1280
HR = 800

so:

X = sqrt ( 49 / 3.56)

X = 3.71 inches ~ 94mm

Y = (1280/800) * X = 1.6X

Y = 5.936 inches ~ 151mm

so we have 151mm x 94mm which Peanut has linked to.

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This assumes square pixels, which isn't always the case (though it is on the Nexus 7). You want to use the aspect ratio instead. –  derobert Nov 30 '12 at 11:12
    
does this work for alternative pixel arrangements, like PenTile? –  Lie Ryan Dec 2 '12 at 18:36
    
@derobert Thanks for the point, OK, so we can simply replace VR/HR with aspect ratio. –  yrajabi Dec 5 '12 at 7:21
    
@LieRyan Yes, in the cases where pixels are not square, we can use aspect ratio (e.g 4:3 or 16:9) instead of actual resolution values (e.g 1280x800). –  yrajabi Dec 5 '12 at 7:24
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So you want to know the display area ..


(A.) The non-masked (clear) area of the front face:

A simple metric ruler, and ASUS Nexus 7, gives you ..

Answer: 152mm x 95mm

OR

(B.) The area of active pixels, on the IPS LCD display:

display pitch: 216 dpi (pixels per inch, leading edge to leading edge)

pixel size: 96% of pitch (guesstimate, without engineering drawings)

pixel geometry: square (identical height, width)

display size (in pixels): 1280 x 800

screen area: (mathematical)

 => (height - 1) x pitch + pixel_width by (width - 1) x pitch + pixel_width
 => (1279 x 0.1175 + 0.1128) by (799 x 0.1175 + 0.1128)
 => 150.40 by 94.00 mm

Answer: 150.4mm x 94.0mm


ADDENDUM:

Actual diagonal width, for ASUS Nexus 7 display area:

  => square root ( height squared + width squared )
  => square root ( 150.40 squared + 94.00 squared )
  => square root ( 22,620.16 + 8,836 ) mm
  => 177.36 mm
  => 177.36 / 25.4 (convert to inches)

Answer: 177.4mm or 6.98 in

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try downloading the Screeninfo app from the Google Play store for useful screen info. This works on any other Android device as well.

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