Next few posts, I will be writing about LCD TVs and also try to compare models from Sony, LG, Samsung, Panasonic etc. Before I start comparing, I would like the viewers to know some of the technical terms used.
Everyone of us would have heard SDTV, HDTV, HD Ready, FullHD etc. All of them relate to the resolution of the LCD TV which is probably carrying lot of hype in LCD TV world.Almost everyone looks for a better picture quality and many think resolution plays a major role.
But infact resolution is not the first one to look at. The most important aspect of picture quality is contrast ratio. But I will go according to market and explain about resolution first :-)
Televisions are of the following resolutions:
Taken from wikipedia
* SDTV: 480i (NTSCNTSC uses an analog system of 486i split into two interlaced fields of 243 lines)
* SDTV: 576i (PALPAL, 720×576 split into two interlaced fields of 288 lines)
* EDTV: 480p (720×480 progressive scan)
* EDTV: 576p (720×576 progressive scan)
* HDTV: 720p (1280×720 progressive scan)
* HDTV: 1080i (1920×1080 split into two interlaced fields of 540 lines)
* HDTV: 1080p (1920×1080 progressive scan)
"p" means progressive scan and "i" means interlaced scan.
For ex:- 1080i is 1080 lines interlaced scanning method and 1080p is 1080 lines progressive scan method.
Progressive scanProgressive scan and interlaced scanning are two methods of displaying where Progressive scan means lines are drawn in sequence and interlaced means odd lines first and even later.
Unlike pixels on a plasma screen, which produce their own light, the pixels on an LCD panel perform as filters for the light source behind them. Each pixel is made up of red, green and blue subpixels, which can produce almost any color when used in combination.
1080p definitely means a better picture but we have equivalent transmissions and players?
Definitely not.
A Full HD TV is better utilized if the video/image is also Full HD. To see the quality that is shown in showrooms, one need a High density disk to play and a HD player.
Showrooms use some Blueray disk playersBlueray disk players (HD player) to show the quality of Full HD LCD TV. But when you buy the TV and use your cable, many will be disappointed and many do call their vendors/service centers asking for the same.
The truth is your cable TV signal is not of HD quality.
Even tough some DTH vendors use DVB-S2 signal, still the signal they get from various channels is not HD. Tough there are few western channels like HBO, NatGeo etc which telecast HD signal, theres no Indian Channel which transmit HD signal.
In India, Airtel and few others use DVB-S2 signal, they still use a analog component video o/p which is only capable of transmitting DVD quality. which is 720X480.
Even if you buy a blue ray disk player, you don't have any HD video available in the market. DVD video is ruling now and it will take a long time to see HD videos available in the market.
The reason is simple…it needs a whole lot of change. Even the movie makers need to change their cameras!
To fully utilize HD, one need to shoot using HD camera, broadcast HD signal, setup box should have capability to recieve HD signal and through HDMI cable display HD images or shoot with HD camera, release blu-ray disks, play on blu-ray players connected to LCD TV via HDMI cable.
Then only one can realize the capacity of HD TV.
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