A popular topic in televisions nowadays is full HDTV (full high definition television). This is due to the full changeover of digital television (DTV) signal on June 12, 2009. With this transition complete, everyone has access to HDTV signal. However, not everyone has HD display because in order to get it, you must have an HDTV display television.
For HDTV, resolution is the key word, defining how detailed an image can be displayed without blurring. Those who opted for the HD converter box are still viewing a picture on an analogue CRT screen .NTSC-analogue TV resolution is defined as 480i. The 'i' means interlaced. This results from the TV camera having 480 horizontal lines of resolution while the CRT tube has only 240 lines available. So every other line of the 480 is simultaneously scanned for 1/60th of a second then the remaining lines are scanned. Hence, the TV signal is "interlaced" giving the appearance of more vertical resolution. With an aspect ratio of 4:3 (width x height), the analogue television resolution can be described as 640 x 480i.
The resolution of JDTV and full HDTV are what make them different from analogue TV. The full HDTV resolution is 1080i or 1080p. The standard HDTV has a resolution of 720i or 720p. The "p" stands for progressive scanning, meaning that the vertical scans are done at the same time instead of interlaced. With an aspect ratio of 16:9, the full HDTV has 1920 x 1080 pixels while the standard HDTV has 1520 x 720 pixels.
The full HDTC is the product that is most favourable, but on TVS with a smaller screen than 42 inches, the difference in the resolution between the standard and full HDTVs isn't noticeable. Therefore, any TV that has a smaller screen than 42 inches is only available in standard HDTV. So, if you want to have full JDTV, you will need to purchase a TV that is 42 inches or larger.
There are currently three options in screen technology for full HDTV: rear projection HDTV, full HD plasma, and full HD LCD TV. Though rear projection televisions are still available, the demand and popularity of them seems to be decreasing. For that reason, many manufacturers aren't even making them anymore. Therefore, it's advised to choose between the two remaining options. Other things to consider when choosing a new television are response time, the contrast ratio, and color reproduction qualities.
Full HDTV plasma displays are bright, have a wide color range, and can be produced in fairly large sizes, up to 58 inches is commercially available. Because the display panel is only about 6 cm (2.5 inches) thick, the overall thickness is about 4 to 6 inches. Contrast ratios are as high as 50K to 100K are claimed but, in reality, the highest available in stores is 30K with response times at 0.001 milliseconds and refresh frequencies of 600 Hz. Fast response times make plasma TV's ideal for fast motion video (films or sports viewing). Plasma screens also are said to have better color reproduction than LCDs and to have a wider viewing angle.
Of course full HDTV plasma is not perfect. The power requirements can be as high as 500 watts for some large screen versions and because the screen is made of glass, glare can be a problem. Plasma displays are heavier compared to their LCD counterparts but can be wall mounted.
Full HDTV LCD displays have the same resolution as plasma full HDTV displays, but the LCD displays have a slower response time (2 milliseconds). This could result in ghosting during fast moving images. The refresh frequency of an LCD display screen is 240 Hz, but the contrast ratio has been improved so that it's the same as the plasma screen (30K). Though there are some differences in response time and refresh frequencies, LCD TVs are less expensive than plasmas.
A note of caution, except for resolution, when comparing specifications many reviewers question their accuracy and their meaningfulness to your viewing experience. My advice is judge for your self. In conclusion, barring financial and/or physical restraints or simple preference for smaller TV size, full HDTV is the obvious choice. If striving for a home theatre experience, make sure your full HDTV is compatible with the entire system you are planning. - 29872
For HDTV, resolution is the key word, defining how detailed an image can be displayed without blurring. Those who opted for the HD converter box are still viewing a picture on an analogue CRT screen .NTSC-analogue TV resolution is defined as 480i. The 'i' means interlaced. This results from the TV camera having 480 horizontal lines of resolution while the CRT tube has only 240 lines available. So every other line of the 480 is simultaneously scanned for 1/60th of a second then the remaining lines are scanned. Hence, the TV signal is "interlaced" giving the appearance of more vertical resolution. With an aspect ratio of 4:3 (width x height), the analogue television resolution can be described as 640 x 480i.
The resolution of JDTV and full HDTV are what make them different from analogue TV. The full HDTV resolution is 1080i or 1080p. The standard HDTV has a resolution of 720i or 720p. The "p" stands for progressive scanning, meaning that the vertical scans are done at the same time instead of interlaced. With an aspect ratio of 16:9, the full HDTV has 1920 x 1080 pixels while the standard HDTV has 1520 x 720 pixels.
The full HDTC is the product that is most favourable, but on TVS with a smaller screen than 42 inches, the difference in the resolution between the standard and full HDTVs isn't noticeable. Therefore, any TV that has a smaller screen than 42 inches is only available in standard HDTV. So, if you want to have full JDTV, you will need to purchase a TV that is 42 inches or larger.
There are currently three options in screen technology for full HDTV: rear projection HDTV, full HD plasma, and full HD LCD TV. Though rear projection televisions are still available, the demand and popularity of them seems to be decreasing. For that reason, many manufacturers aren't even making them anymore. Therefore, it's advised to choose between the two remaining options. Other things to consider when choosing a new television are response time, the contrast ratio, and color reproduction qualities.
Full HDTV plasma displays are bright, have a wide color range, and can be produced in fairly large sizes, up to 58 inches is commercially available. Because the display panel is only about 6 cm (2.5 inches) thick, the overall thickness is about 4 to 6 inches. Contrast ratios are as high as 50K to 100K are claimed but, in reality, the highest available in stores is 30K with response times at 0.001 milliseconds and refresh frequencies of 600 Hz. Fast response times make plasma TV's ideal for fast motion video (films or sports viewing). Plasma screens also are said to have better color reproduction than LCDs and to have a wider viewing angle.
Of course full HDTV plasma is not perfect. The power requirements can be as high as 500 watts for some large screen versions and because the screen is made of glass, glare can be a problem. Plasma displays are heavier compared to their LCD counterparts but can be wall mounted.
Full HDTV LCD displays have the same resolution as plasma full HDTV displays, but the LCD displays have a slower response time (2 milliseconds). This could result in ghosting during fast moving images. The refresh frequency of an LCD display screen is 240 Hz, but the contrast ratio has been improved so that it's the same as the plasma screen (30K). Though there are some differences in response time and refresh frequencies, LCD TVs are less expensive than plasmas.
A note of caution, except for resolution, when comparing specifications many reviewers question their accuracy and their meaningfulness to your viewing experience. My advice is judge for your self. In conclusion, barring financial and/or physical restraints or simple preference for smaller TV size, full HDTV is the obvious choice. If striving for a home theatre experience, make sure your full HDTV is compatible with the entire system you are planning. - 29872
