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HDTV vs UHDTV | Difference between HDTV and UHDTV

This page compares HDTV vs UHDTV and mentions similarity and difference between HDTV and UHDTV types.

Any sequence of time varying images is known as video signal. Video signal is treated as series of images called frames. An illusion of continuous video is obtained by changing frames in faster manner which is known as "frame rate".

There are two scan patterns viz. progressive and interlaced. In progressive scan, each frame of picture information is scanned completely to create video signal. Progressive scan patterns are used for high resolution display monitors.

In interlaced scan pattern, odd and even lines of each picture are read out in two separate scans of odd and even fields respectively. This allows good reproduction of movement of scene at relatively low field rate.

There are different types of digital TV which include SDTV, EDTV, HDTV, UHDTV etc. SDTV stands for Standard Definition Digital Television which has 4:3 aspect ratio and picture is 480 x 640 pixels with interlaced scanning. EDTV stands for Enhanced Definition Television which uses progressive scanning. EDTV creates smoother overall picture and can have aspect ratio of 4:3 or 16:9.


High Definition Television provides high resolution in 16:9 aspect ratio. This aspect ratio allows viewing of cinemascope and panavision movies.

There are different versions in HDTV as mentioned below.
• HDTV (720p) : This HDTV format features 720 x 1280 pixel resolution with progressive scanning. This format is ideal for programming with lots of movement. It has aspect ratio of 16:9.
• HDTV (1080i) : This HDTV format features greater resolution than 720p which is 1080 x 1920 pixels and uses interlaced scanning. The aspect ratio is same as 720p which is 16:9.
• HDTV (1080p) : This HDTV format uses 1080 x 1920 pixel resolution and aspect ratio of 16:9 with progressive scanning. This format is not used for broadcasting due to high bandwidth requirements. New HD DVD and Blu-ray high definition DVD formats are capable of 1080p picture.



Ultra High Definition Television includes 4K UHD format and 8K UHD format. These are two digital video formats with aspect ratio of 16:9. These are initially proposed by NHK Science and Technology Research Laboratories. They are later defined and approved by ITU.

Following are the different UHDTV formats.
• 4K UHD or UHDTV-1 : Resolution of 3840 wide x 2160 tall pixels. It is known as 2160p. This resolution is 4 times of 1080p HDTV.
• 8K UHD or UHDTV-2 : Resolution of 7680 wide x 4320 tall pixels. It is known as 4320p. This resolution is 16 times of 1080p HDTV.

Difference between HDTV and UHDTV

Following table summarizes similarity and difference between HDTV and UHDTV.

Full Form High Definition Television Ultra High Definition Television
Screen Resolution in pixels 1920 x 1080
1280 x 720
4096 x 2160 (4K UHDTV)
7680 x 4320 (8K UHDTV)
Aspect Ratio 16:9
Frame Rate
( i - Interlaced, p - Progressive )
14p, 30p, 60i
14p, 30p, 60i
Pixels per frame 2.1M 8.8M (4K UHDTV),
33M (8K UHDTV)
Megapixels per second 124 531 (4K UHDTV),
1991 (8K UHDTV)
Video Signal Bandwidth needed (Gbps) 3 16 (4K UHDTV),
60 (8K UHDTV)


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