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6-3 Screen Defects
The following are the defect limits for this product. They include DMD defects and lens
defects where the latter are visible as point or area artifacts.
6-3.1 Image Size
The projector shall be set up in the standard operating position for all evaluations in this
section. Nominal image size is 121.9 cm (48 inches) wide, and 91.4 cm (36 inches) high. The picture
setting of the SOD shall be set for a linear gray scale reproduction.
* Defect Types
There are two types of defects covered in this section, optical blemishes and DMD
defects. DMD defects consist of individual mirrors which do not change state
correctly and do not reproduce the appropriate gray scale.
* DMD Defects
This includes mirrors which are stuck on (bright pixel), stuck off (dark pixel), stuck
at some arbitrary angle (gray pixel) or who change state when they are not supposed
to (twinklers). Observe the screen under a variety of conditions. Enumerate all
single defects.
* Optical Blemishes
These are defects of the lens system, including scratches and specks of dirt, which
result in noticeableor measurable fixed variations in light intensity on the screen
other than the expected light intensity fall off from the lens axis. Classify blemishes
as either major or minor. Minor blemishes are those which are not readily
noticeable on screen at a viewing distance equal to the standard setup distance of
2.895 meters.
EzPro735
EzPro735
S
M
ERVICE
6 - 7
ANUAL
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