Dmd Specification - Optoma EzPro 710 Manual

Chapter 8
EzPro710
Service Manual
Specifications

8.1 DMD Specification

8.1.1 Definition
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.
Dark pixel
A dark pixel is a single pixel or mirror that is struck in OFF position and iis
visibly darker than the surrounding mirrors.
Bright pixel
A single pixel or mirror that is struck in ON position and is visibly brighter than
the surrounding mirrors.
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.
Adjacent
Defined as sharing a common border or common point.
Blue 180 test screen
This screen is used to test for dark blemishes. All areas of the screen are
colored a Microsoft Paintbrush Blue 180 (green, red, and blue set at 180).
Gray 30 test screen
This screen is used to test bright blemishes. All areas of the screen are
colored a Microsoft Paintbrush Gray 30 (green, red, and blue set at 30).
( NOTE: If linear degamma table is not used then the Microsoft paint brush
values must be adjusted to match the degamma table being used in order
Service Manual
to generate an equivalent gray level on the test screen image.)
EzPro 710 8-1