BenQ PB6200 - Manual (Page 88)

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DMD Image Specification
1. SCOPE
This document specifies the image quality requirements applicable to the XGA RGBW
Palmtop Configuration F Component Kit. The Component Kit provides the XGA RGBW
Palmtop Projector with Digital Imaging functionality based on Digital Micromirror Device
(DMD) technology.
2. Definitions
2.1 Blemish
A blemish is an obstruction, reflection, or refraction of light that is visible, but out of
focus in the projected image under specified conditions of inspection (see Table 1).
It is caused by a particle, scratch, or other artifact located in the image illumination
path.
2.2 Dark pixel
A dark pixel is a single pixel or mirror that is stuck in the OFF position and is visibly
darker than the surrounding mirrors.
2.3 Bright pixel
A single pixel or mirror that is stuck in the ON position and is visibly brighter than
the surrounding mirrors.
2.4 Unstable pixel
A single pixel or mirror that does not operate in sequence with parameters loaded
into memory. The unstable pixel appears to be flickering asynchronously with the
image.
2.5 Adjacent
Two or more stuck pixels sharing a common border or common point , also referred
to as a cluster .
2.6 Streaks
Artifact resulting from localized variation in mirror tilt angle relative to surrounding
mirrors . They are similar in appearance to window scratches but appear at the
mirror
Level . Streaks appear as faint diagonal or arcing patterns in the image.
2.7 Sea of Mirrors ( SOM )
SOM is a rectangular array of off-state mirrors surrounding the active area.
2.8 Eyecatcher
A small localized light “spot” which haas high spatial frequency and high
differential
Brightness. These are due to various DMD window or window aperture “defects”
Including : digs , voids , particles and scratches.