PLASMA DISPLAY MONITOR RASTOR VS RANDOM SCAN INTERLACING AND NON-INTERLACING. PLASMA DISPLAY MONITOR. WHAT IS PLASMA?.
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RASTOR VS RANDOM SCAN
INTERLACING AND NON-INTERLACING
Plasma is often called the "Fourth State of Matter", the other three being solid, liquid and gas. A plasma is a distinct state of matter containing a significant number of electrically charged particles, a number sufficient to affect its electrical properties and behavior.
Plasma is a substance similar to gas in which a certain portion of the particles are ionized .
When operated as a random-scan display unit, a CRT directs the electron beam only to the parts of the screen where a picture is to be drawn.
In raster scan, the beam sweeps horizontally left-to-right at a steady rate, then blanks and rapidly moves back to the left, where it turns back on and sweeps out the next line (flyback).RANDOM vs RASTER SCAN
Random displays have high resolutions the electron beam only to the parts of the screen where a picture is to be drawn.
Smooth lines are produced as the electron beam directly follows the line path
Random-scan system's are generally costlier
Random scan systems are designed to draw all the component lines of a picture 30 to 60 times each second
Picture definition is stored as a set of line drawing commands in an area of memory referred to as refresh display file.
Raster displays have less resolution
Lines produced are ziz-zag as the plotted values are discrete
Decreasing memory costs have made raster systems popular.
Refreshing on raster scan displays is carried out at the rate of 60 to 80 frames/second
Picture definition is stored in a memory area called the refresh buffer/frame buffer.
Interlaced scan refers to one of two common methods for "painting" a video image on an electronic display screen by scanning or displaying each line or row of pixels.
This technique uses two fields to create a frame. One field contains all the odd lines in the image, the other contains all the even lines of the image .
It is the opposite phenomenon of Interlacing. In this all the lines of frame are scanned in one pass.
For higher resolution the non-interlaced display creates a better image as compared to Interlaced display. The scanning is done line by line in continuous fashion in non-interlaced display.