HP LP2065 Understanding pixel defects in TFT flat panel monitors - Page 8

Defect type definitions Bright/dark dot: A sub-pixel stuck on or off. Bright spots/lines: Spots or lines that appear light in the display. Defects do not vary in size or intensity (contrast) when contrast voltage is varied. Contrast variation can be achieved through the use of varying gray shade patterns. This defect may not completely block the light emitted by any pixels. Cluster: A group of defective sub-pixels which are in close proximity to each other. Cross lines off: When the unit lights, lines in both the minor and major axis do not appear. Dark spots/lines: Spots or lines that appear dark in the display patterns and are usually the result of contamination. Defects do not vary in size or intensity (contrast) when contrast voltage is varied. Contrast variation can be achieved through the use of varying gray shade patterns. This defect may not completely block the light emitted by any pixels. Dim line: When the unit lights, line(s) in the minor (vertical) or major (horizontal) axis appear dim, but not completely on or off. Horizontal line: A line of pixels that crosses the display horizontally in portrait mode. Mottling: When the unit lights, variation/non-uniformity (splotchiness) appears light (white) with the display and might vary in size. Newton ring: A "rainbow" effect caused by non-uniform cell thickness. Pixel: A picture element made up of three primary color sub-pixels (red, green, and blue), which combine to represent a single color dot on the display. Polarizer dent: Physical damage to the polarizer that does not damage the glass. When the unit lights, spots appear light (white) with display patterns dark and do not vary in size. This defect may not completely block the light emitted by any pixels. Polarizer scratch: Physical damage to the polarizer that does not damage the glass. When the unit lights, lines appear light (white) with display patterns dark and do not vary in size. This defect may not completely block the light emitted by any pixels. Rubbing line/defects: Horizontal or diagonal lines that appear gray with the display patterns dark and may have resulted from an "out of control" rubbing process on the polyimide or "waves" on the BEFs or prism sheets. Sub-pixel: A single point of light representing a primary color (red, green, or blue), which combines with the other two primary color sub-pixels to form a complete pixel. Vertical line: A line of pixels that crosses the display vertically in portrait mode. 8