LG RD-JT30 Service Manual page 86

2.8 Pond of Mirrors (POM)
POM is a rectangular array of off-state mirrors surrounding the active area.
2.9 Eyecatcher
Eyecatcher's are blemishes appearing in the area outside of the Active Area. These are due to
particles and various DMD window or window aperture "defects" including: digs, voids, and
scratches.
2.10 Border Artifacts
Border artifacts are a general category of image artifacts that may show up on screen in the area
outside of the active array. Border artifacts include: Exposed Bond Wires, Exposed Metal 2, and
Reflective Edge.
2.10.1 Bond Wires
Bond Wires are the electrical connections between the die and the DMD ceramic package. If
visible, they will appear as short light parallel lines outside of the Pond of Mirrors (POM).
2.10.2 Exposed Metal 2
Exposed Metal 2 is due to a shift in positioning of either the die or the window aperture, which
may allow light to be reflected off of the layer of metal 2 that is below the super structure (mirrors).
This defect is located outside of the POM.
2.10.3 Reflective Edge
Reflective Edge is light that may reflect from the edge of the DMD window aperture onto the
projection screen. It will appear as a thin diffuse line outside of the POM.
2.11 Two Zone Gray 10 Screen
The Two Zone Gray 10 screen is used to test for Major Light Blemishes, Streaks, Eyecatcher
and Border Artifacts. All areas of the screen are colored a Microsoft Paintbrush gray 10 (green, red,
and blue set at 10).
NOTE: If linear degamma is not used then the Microsoft Paintbrush values must be adjusted to
match the degamma table being used in order to generate an equivalent gray level on the test screen
image.
DRAWING NO 2503651 REV A SHEET 3
2.12 Two Zone Blue 60 Screen
The Two Zone Blue 60 screen is used to test for major dark blemishes. Refer to Figure 1 for
configuration. All areas of the screen are colored a Microsoft Paintbrush blue 60 (green and red set
at 0, blue set at 60).
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