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1.3.8 Display Communications Channel
The monitor assembly shall provide a display
communications channel that conforms to VESA
DDC2Bi hardware requirements. This configuration
shall contain the 128-byte EDID file as specified by
VESA EDID standard.The monitor should not write to
the EDID file for the first two minutes of operation
following power-up UNLESS some action taken by the
user or the host CPU forces the write (for instance,
requesting the serial number via the OSD).
Furthermore, it is recommended that CMOS switches
be incorporated to isolate the DDC IC from outside
connections while the EDID Fault Management is
being updated. This is to prevent corruption of the data
by attempts to read the data while it is being changed.
1.3.9 Firmware Update Function (same ISP function)
The update firmware need through from the D-Sub
connector, use DDC I2C bus to do update firmware.
1.4 PANEL ELECTRICAL
1.4.1 General Requirements
The panel used as the display device shall be an
WUXGA resolution, 24W TFT-LCD. This panel shall be
approved for use in this monitor.
1.4.2 Panel Timings
The controller included with the monitor shall translate all
video timings from the CPU that meet the timing
requirements listed in Panel specification into timings
appropriate for the panel. Under no circumstances may the
controller supply the panel with timings that may result in
damage. The controller shall insulate the panel from the
CPU , so that the panel shall always be driven per it's own
specification regardless of the timings being sent from the
CPU.
1.4.3 Polarizer Hardness
The outer face of the front polarizer panel shall be
covered with a coating witha#3hardness 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 ---------------------- < 1.0 lux
Temperature-------------------------- 10
Inactive Time ----------------------- > 24 hours
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. Product Specification (continued)
InputV oltage Range
The operating range shall be from 90 to 132 and 195 to 265 AVC
sinusoidal for all models specified.
InputFrequency Range
Input power frequency range sha;; be from 47.5 to 63 Hz over the
specified input voltage range.
Power Consumption
Power consumption forthe monitor shall be less than 46W over the
specified voltage and frequency ranges. In suspend or sleep mode
the power consumption willbe less than 2W.
Line F use
The AC input shall be fused and become electricallyopen as a result
on an unsafe current level. The fuse manynot be user replaceable.
Initial Cold Start
The power supplyshall start and function properlyw hen under full
load, with worst case conditions of input voltage, input frequenct,
operating temperature, and cold backlight lamps.
Inrush Current
The inrush current must be limited to 30A when operated at
120VAC, and 50A when operated at 220VAC. Inrush current is
measu red a t an ambient temperatu re o f 25
o
C, w i th the un it
temperature stabilized inthe po w er-off.
Hot StartCycle
The power supplyshall be damaged when switched ON for one
second and OFF for one second for seven consecutive after
operating for one hourat full load,25
o
C, and nominal input line
voltage.
Under Voltage
The power supplyshall contain protection circuitry such thatthe
application of an input voltage below the minimum specified in this
table shall not cause damage to the power supply unit nor cause
failure of the input.
Line Transient
The power supply shall operate within IEC 801-4 1KV) and IEC
801-5 2KV) for the domestic U.S. version. TheU PS power
supply shall operate and comply with CE mark.
AC to DC Converter R equirements
Table 2
6
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ACER G24