Acer RA19WAANU Service Manual download pdf (Page 7)

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

WXGA 1366X768 resolution, 19 inch-wide 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 degree. 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)

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 .

1.4.5.3 Light Leakage

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.

1.4.5.4 Allowable Defects

No cosmetic defects are allowed except those

specified below.The conditions of visual

inspections are as follows

For P19W 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.

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