Samsung 920NW Service Manual - Page 58

14 Reference Infomation 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 synchronizing 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 technol- ogy is used to step up/down the input power by switching on/off -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. -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. -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 14-1