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Appendix D
1. SCOPE
This document specifies the image quality requirements applicable to the HD2 Component
Set for Front Projection image display. The HD2 Component Set provides digital imaging
functionality based on Digital Micromirror Device (DMD) technology.
2. DEFINITIONS
2.1 Blemish
A blemish is an obstruction (dark blemish), reflection, or refraction of light (light blemish)
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 non-functional (stuck) in the OFF position.
2.3 Bright pixel
A bright pixel is a single pixel or mirror that is non-functional (stuck) in the ON position.
2.4 Unstable pixel
An unstable pixel is 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 pixels
Adjacent pixels are defined as sharing a common border or common point.
2.6 Border defects
Border defects are bright blemishes (see 2.1) or bright pixel defects (see 2.3) in the
non-active area that may be visible in front projection mode.
2.7 Blue test screen
This screen is used to test for major dark blemishes and dark pixels. All areas of the screen
are colored at a specific blue level, based on MS Paint 0-255 RGB scale:
All manuals and user guides at all-guides.com
HD2 Front Projection Image Quality Specification
Blue Value
Red Value
Green Value
Major Dark Blemish
90
0
0
17
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