Reference Infomation; Technical Terms - Samsung 920NW - SyncMaster - 19" LCD Monitor Service Manual

14 Reference Infomation

14-1 Technical Terms

-TFT-LCD
Thin film Transistor Liquid Crystal Display
-ADC(Analog to Digital Converter)
This is a circuit that converts from analog signal to
digital signals.
-PLL(Phase Locked Loop)
During progressing ADC, Device makes clock syn-
chronizing HSYNC with Video clock
-Inverter
Device that supplies Power to LCD panel lamp.
This device generates about 1,500~2,000V.
AC Adapter
Device that converts AC(90V~240V) to DC(+12V
or 14V)
-SMPS(Switching Mode Power Supply)
Switching Mode Power supply. This design tech-
nol- ogy is used to step up/down the input power
by switching on/off
-FRC(Frame Rate Controller)
Technology that changes the number of frames
dis- played on screen per second.
TFT-LCD panel requires 60 frames per second.
This technology is needed to convert input image
to 60 frames per second regardless input frame
quan- tity.
-Image Scaler
Technology that convert various input resolution to
other resolution.(ex. 640* 480 to 1024*768)
-Auto Configuration(Auto adjustment)
This is an algorithm to adjust monitor to optimum
condition by pushing one key.
-OSD(On Screen Display)
Customers can easily control the screen settings
using the OSD.
-FINE
The "Fine" adjustment is used to adjust visibility by
controlling phase difference.
-COARSE
This adjustment adjusts the display by tuning
Video clock and PLL clock.
-L.V.D.S.(Low Voltage Differential Signaling)
A kind of transmission method for Digital. It can be
used from Main PBA to Panel.
-DDC(Display data channel)
It is a communication method between a Host
Computer and related equipment. It enables Plug
and Play between PC and
Monitor.
-EDID
Extended Display Identification Data PC can
recog- nize monitor information, such as Product
data, Product name, Display mode, Serial number,
Signal source, etc. Data is recognized via DDC
Line linking PC and Monitor.
-Dot Pitch
The image on a monitor is composed of red, green
and blue dots. The closer the dots, the higher the
resolution. The distance between two dots of the
same color is called the 'Dot Pitch'. Unit: mm
-Vertical Frequency
The screen must be redrawn several times per
sec- ond in order to create and display an image
for the user. The frequency of this repetition per
second is called Vertical Frequency or Refresh
Rate. Unit: Hz Example: If the same light repeats
itself 60 times per second, this is regarded as 60
Hz.
-Horizontal Frequency
The time to scan one line connecting the right
edge to the left edge of the screen horizontally is
called Horizontal Cycle. The inverse number of the
Horizontal Cycle is called Horizontal Frequency.
Unit: kHz
14 Reference Infomation
14-1