A question on 720p 1080i and 1080p - High-Def Digest Forums
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Old 10-14-2007, 06:05 PM
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Default A question on 720p 1080i and 1080p

Im pretty new to this forum and would like some input. I am thinking about getting a Toshiba HD-A2 and am wondering what the difference is between the 1080i picture and 1080p picture. I currently have a 30 inch 720p/1080i capable television. I"ve been told that the difference between 1080i and 1080p pictures on a 30 inch would not be noticed by the human eye. I would like to eventually up grade to a larger telelvision or projector. Should I buy the HD-A2 or go with one that can do 1080p for future upgradability. Does anyone have an opinion? Any info is greatly appreciated.
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Old 10-14-2007, 07:00 PM
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ok here's the deal. 1080p and 1080i are virtually identical IF one is comparing two FULL HD set (1920 x 1080p)---one displaying a signal in 1080i, the other in 1080p. If you only have a 720p set then there is a substantial difference between your 720p (1080i) and someone else's FULL 1080p set because of the extra pixels. Got it?
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Old 10-14-2007, 07:54 PM
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Default There is a difference albeit subtle.

The difference is in the resolution & how the image is loaded on the screeen. Each time the image is refreshed on the screen it is either done progressively (the whole image is re-displayed every time) or interlaced (every second line of the image is refreshed at a time.)

"NTSC" DVD = 720 x 480 pixler (0.35 megapixel)
720p = 1280 x 720 pixels (0.92 megapixel)
1080i & 1080p= 1920 x 1080 pixels (2.1 megapixel)

1080i = 1920 x 540 pixels per refresh. (half as much information refreshed/processed at a time.)
1080p = 1920 x 1080 pixels per refresh.(the highest amount of information processed)

The actual number of pixels on the screen may be slightly different than there are in the image being shown. E.g. my plasma is HD ready 720p/1080i & has a native resolution of 1024 x 768 pixels, but can process a signal of 1080p at a rate of 24hz,(but not at 50hz or 60hz) shrinking the input image from 1920 x 1080 pixels to 1024 x 768 pixels.

So, if you want to future proof get a player that can send the highest quality image as if to a flatscreen that can process 1080p signals but also has a native resolution of 1920 x 1080.

BUT, there is still no need to worry if you purchase an A2 because it will most likely display a great image at 720p... still it may be worthwhile to get a player that can send a signal at 1080p at 24hz as this ought to give you the smoothest image.

(Side note: 720p is better for moving images than 1080i. 1080i is great for slow or still images...Progressive images are easier on the eyes, despite the argument that the human mind cannot percieve it. Rashly stated, an interlaced image relies on your mind to deinterlace the image & send it to your conscious.)
All the best with your purchase.

Last edited by Helo; 10-15-2007 at 05:16 AM. Reason: typo
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Old 10-14-2007, 09:27 PM
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I would suggest you invest in the highest HD model that your budget permits.

HD-A2 is an excellent player. Currently I'm using it but my only gripe is there's no
5.1 analog outputs. Thus, I was "forced" to get a HDMI equipped AV receiver in order to experience the lossless Dolby TrueHD.

So to future proof your HD player, as the above member says it's worthwhile to get a player that can send a signal at 1080p at 24hz. Also they have the 5.1 analog so that you can use your existing receiver.

I'm sure in future as HDTV 1080p prices drop & with better models released, you will be tempted to get a display of 42" & above. There's a big difference Viewing HD in 30" vs 42". You will be able to appreciate HD more on a bigger display.
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