S
ERVICE
M
ANUAL
6 - 5
EzPro730 0.7*1 DMD SVGA Micro Portable Projector
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Note 1 : Differential Mirror Position
Differential mirror position refers to the geometric distortion of the array compared to an ideal
array that locates the center of each mirror on the corresponding grid at 17.0 micron pitch. It is
created by distortion in the optical performance of the semiconductor processing equipment used to
define the array, and to a lesser extent by warpage and nonuniform etching in processing of the array.
As an example, for the 8460 device, which has a resolution of 848 horizontal by 600 vertical pixels,
if we define a coordinate system with origin at the upper left corner pixel (0,0), the pixel at the lower
right hand corner will be at coordinates (14,399 +/- 1 micron, 10,183 +/- 1 micron). Similar
tolerances apply within the array, e.g., the pixel in the 100th row and 100th column will be centered at
coordinates (1700 +/- 1 micron, 1700 +/- 1 micron) assuming we define the corner pixel as being in
the zeroth row and the zeroth column, centered at coordinates (0,0).
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