Acer B223PWL Service Manual page 14

1.4 Flat Panel:
1.4.1 General Requirements:
The panel shall be a 609.7mm (22"W) a-si TFT Active matrix LCD.
1.4.2 Polarizer Hardness:
The front polarizer should have hard coating (2..3H) and anti-glare treatment.
1.4.3 Backlight Requirements:
1.4.3.1 General Requirements:
1.4.4 Defects:
1.4.4.1 Defect T erminology:
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.
Bright Spots / Lines: Spots or lines that appears light in the display patterns. 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.
Polarizer Scratch: When the unit lights, lines appear light (white) with display patterns dark and do not
vary in size. Physical damage to the polarizer does not damage the glass.
Polarizer Dent: When the unit lights, spots appear light (white) with display patterns dark and do not vary
in size. Physical damage to the polarizer does not damage the glass.
Rubbing Line: 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 .
Newton Ring: The "rainbow" effect caused by non-uniform cell thickness.
Mottling: When the unit lights, variation / non - uniformity (splotch) appears light (white) with the display
and might vary in size.
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