Acer B223PWL Service Manual page 15

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Dim Line: When the unit lights, line(s) in the minor (vertical) or major (horizontal) axis appear dim, but not
completely on or off.
Cross Lines Off: When the unit lights , lines in both the minor and major axis do not appear.
Bright/Dark Dot: A sub - pixel (R, G, B dot) stuck off / on (electrical).
1.5 Optical Characteristics:
1.5.1 Measurement method:
The LCD module should be stabilized at given temperature for 40 minutes to avoid abrupt temperature change
during measuring . In order to stabilize the luminance, the measurement should be executed after lighting
Backlight for 40 minutes in a stable, windless room.
1.5.2 Definition of viewing angle measured by ELDIM (EZContrast 88)
Viewing angle is the measurement of contrast ratio
180° vertical range (off-normal viewing angles). The 180° viewing angle range is broken down as follows; 90°
(_) horizontal left and right and 90° (_) vertical, high (up) and low (down). The measurement direction is
typically perpendicular to the display surface with the screen rotated about its center to develop the desired
measurement viewing angle
≧ 10, at the screen center, over a 180° horizontal and