Acer AL1516W Service Manual page 7

ACER AL1516W
6
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1.4.3 Polarizer Hardness
The outer face of the front polarizer panel shall be
covered with a coating with a # 3 hardness value
1.4.4 Backlight Requirements
1.4.4.1 General Requirements
The backlight assembly shall be designed to
support field replacement at the customer site or
authorized service center. The lamps shall have a
continuous operating life of at least 40,000 hours at
25 The operating life is defined as having ended
when the illumination of light has reached 50% of
the initial value. The lamps shall extend a sufficient
amount from the edge of the light guide that
sputtering over the life of the lamps shall not cause
degradation of the luminance uniformity (such as
non-illuminated bands along the edges of the
display).
1.4.4.2 Lamps Startup Time
The backlight lamps shall start about 2 sec of the
time the monitor power switch is pressed or the
monitor is restarted from a power - down mode
.The starting time shall stay about 2 sec. for the
minimum expected life of the lamps.
Test conditions are as follows :
Ambient Light ----------------------
Temperature--------------------------
Inactive Time -----------------------
1.4.5 Defects
1.4.5.1 Visual Inspection
The LCD panel shall be inspected with all pixels
set to white , black , red , green , and blue. The
color variation, brightness variation , and overall
appearance must not be perceived as poor quality
by Lite-On . Areas and / or parameters considered
questionable shall be subjected to detailed
measurements .
1.4.5.2 Display Degradation
Over the life of the product , variation of the
parameters specified in Panel specification shall be
maintained within reasonable limits.The panel must
not exhibit any significant defects while in
operation ( excluding the CCFL operation ).This
does not in any way change the warranty given by
the panel manufacturer .
1. Product Specification (continued)
1.4.5.3 Light Leakage
.
1.4.5.4 Allowable Defects
1.4.5.5 Defect Terminology
D ark / Spots / Lines
Bright Spots / Lines
Polarizer Scratch
< 1.0 lux
10 ℃
Polarizer D ent
> 24 hours
R ubbing Line
N ew ton R ing
M ottling
D im Line
C ross Lines O ff
Bright / D ark D ot
1.4.5.6 Smudges, Streaks and Smears
1.4.5.7 Other Defects
Except for the active display area , there shall be no
light emission visible from any angle from any other part
of the display . For this test , the ambient illumination
must follow panel's specification.
No cosmetic defects are allowed except those specified
below.The conditions of visual inspections are as follows
For R17 Series.
■
Viewing distance is to be approximately 35-50cm
■
Ambient illumination is to be 300 to 700 lux.
■
Viewing angle shall be at 90 degree.
■
Defects not apparent within one minute shall be
ignored.
Table 3 gives the descriptive terms used in classifying
defects.
Spots or lines that appear dark in the display patterns and are
usually the result of contam ination. D efects do not vary in
size or intensity (contrast) w hen contrast voltage is varied.
C ontrast variation can be achieved through the use of varying
gray shade patterns.
Spots or lines that appear light in the display patterns.
D efects do not vary in size or intensity (contrast) w hen
contrast voltage is varied. C ontrast variation can be achieved
through the use of varying gray shade patterns.
W hen the unit lights, lines appear light (w hite) w ith display
patterns dark and do not vary in size. Physical dam age to the
polarizer that does not dam age the glass
W hen the unit lights, spots appear light (w hite) w ith display
patterns dark and do not vary in size. Physical dam age to the
polarizer that does not dam age the glass.
H orizontal or diagonal lines that appear gray w ith the display
patterns dark and m ay have resulted from an "out of control"
rubbing process on the polyim ide or "w aves" on the B EFs or
prism sheets.
The "rainbow " effect caused by non-uniform cell thickness.
W hen the unit lights, variation / non – uniform ity
(splotchiness) appears light (w hite) w ith the display and
m ight vary in size.
W hen the unit lights, line(s) in the m onitor (vertical) or m ajor
(horizontal) axis appear dim , but not com pletely on or off.
W hen the unit lights, lines in both the m inor and m ajor axis
do not appear.
A sub – pixel (R ,G ,B dot) stuck off / on (electrical).
When viewing the panel oriented so as to maximize
reflected light , there shall be no visible smudging ,
streaking, smearing or other nonuniformity from
contaminants ,fingerprints,or defects in any of the visible
surfaces. This is independent of whether the unit is
operating or off .
Undefined defects that are considered to be rejectable
by Lite–On will be reviewed by Lite-On as they become
apparent. These panels will be referred to the Lite - On
Corporate / Manufacturer Purchasing Agreement for
disposition.