TV viewing has advanced to much higher levels in recent years. Gone are the days of antennas and CRT(Cathode Ray Tube) TVs. Enter HD(High Definition) TV and possibilities. I am trying to jot down my understanding of all the new technologies available that makes TV viewing much more convenient.
HDs are high definition TVs which can produce better resolution than CRTs. This means, the same picture that you used to see with 720X480 pixels per screen on an NTSC broadcast can be viewed with 1080X720(720p) pixels. This means more colors, better contrast and more depth to your picture. Even better, 1080p displays can scale up to 1920X1080 pixels.
Then there is the difference between interlace and progressive technologies. Interlacing is the display technology behind CRTs. This method splits the pixel lines on your screen into 2 groups of alternate lines and draws only alternate lines with every screen refresh or screen draw. This causes the screen flicker on CRT TVs. Due to the alternate line refresh technique, the net resolution you get out of a CRT is only 85% (Kell factor) of the original screen resolution.
Progressive scans can give 95% net screen resolution as compared to 85% for CRTs. This is because progressive draws all the pixel lines on screen sequentially one by one. This obviously means higher signal bandwidth TV signal to display a screen; but at the benefit of flicker free screens. With our communication systems so good these days, channel providers are getting on to higher and higher bandwidth telecasts and today's broadcasts even include scheduling data along side your actual TV transmission.
In my next blog, i will jot down the latest on technologies that can make TV viewing so much personalized.
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