Acer H6510BD Acer Projector H6510BD, P1340W, X1140, X1240 Service Guide - Page 95

DMD Image Quality 1. SCOPE This document specifies the image quality requirements applicable to the DLP®.55SVGA Type X and Series 450 Value Component Set, and DLPTM .65WXGA-800 Value Component Set. The Component Set provides the digital imaging functionality based on Digital Micromirror Device (DMD) technology. 2. Definitions 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 single pixel or mirror that is stuck in the OFF position and is visibly darker than the surrounding pixels. Bright pixel A single pixel or mirror that is stuck in the ON position and is visibly brighter than the surrounding pixels. 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 pixel Two or more stuck pixels sharing a common border or common point, also referred to as a cluster. Reset Boundary Artifact The reset boundary artifact is a single row of pixels on the reset group boundaries that are visibly darker or lighter than the neighboring rows of pixels. Pond of mirrors (POM) POM is a rectangular array of off-state mirrors surrounding the active area. 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. 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. 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). 95