Master

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s Thesis 2006 

FACHHOCHSCHULE

HOCHSCHULE F

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LI Hui 

STUTTGART

TECHNIK

The implementation 

        STUTTGART UNIVERSITY OF APPLIED 

SCIENCES 

3.2  Coordinates transformation   

3.2.1  Dot pitch 

The  dot  specified  by  the  dot  pitch  is  the  smallest  physical  visual  component  on  the 

display.  Also  called  pixel  scale,  a  measurement  that  indicates  the  diagonal  distance 

between  like colored  phosphor  dots  on  a  display  screen  (Figure  12).  Measured  in 

millimeters,  the  dot  pitch  is  one  of  the  principal  characteristics  that  determine  the 

quality  of  display  monitors.  The  lower  the  number,  the  crisper  the  image.  The  dot 

pitch  of  color  monitors  for  personal  computers  ranges  from  about  0.15  mm  to  0.30 

mm.

Dot pitch 

(Pixel scale) 

Fig. 12: Zoomed view of screen pixels

For this research, the display size of a simulator i.e. 240 x 320 pixels on 3.94 inches

'

screen is considered. One inch equal to 25.4 mm, which means the pixel scale is 0.25 

mm. So the real width and  height of the screen  i.e. 6 x 8 cms. This  is the  formulary 

how to calculate the pixel scale. 

1 inch = 25.4 mm 

Screen.width(mm)

2

+Screen.height(mm)

2

 =(Screen.size(inch) x 

25.4(mm))

2

Dot pitch(Pixel scale) = Screen.width(mm)/ Screen.width(px)      or 

                      Screen.height(mm)/ Screen.height(px) 

Listing 9: 

Formulary to calculate the pixel scale 

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