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1024 X 768 vs. 1366 X 768--what's the diff?

by acmsam / January 25, 2006 3:27 AM PST

i have a philips 42" plasma 42PF9630A/37 with 1024 X 768 native resolution. i have heard that i don't get full resolution with a 720p hi-def broadcast, because 768 is for a 4 X 3 screen. What resolution am i watching then in hi def on my 16:9 widescreen? what if i adjust it to 4 X 3?
i assume 1366 X 768 in a 42" screen is better because of more pixels. But what is the widescreen resolution for that set with a 720p broadcast? what resolutions do the respective tv's get with 1080i broadcasts?
is there any internet info on this subject?

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Confusing, ain't it?
by steve.trelease / January 25, 2006 6:42 AM PST

HD is defined in terms of vertical resolution, so anything above 720 "lines" is HD. If you are displaying 720p or 1080i material on your set, it is technically HD.

While the form factor of your monitor is 16:9, the ratio of pixels is 4:3, so the grid formed by four pixels is rectangular (larger horizontally) instead of square. This essentially means that 1366 "dots" of horizontal information are being mapped into 1024 displayed dots, but the width of the picture remains the same.

BTW, I don't believe I've seen any 42" plasmas which go beyond 1024x768 - you have to go to 50" models for that.

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pixel confusion--more questions
by acmsam / January 25, 2006 7:56 AM PST
In reply to: Confusing, ain't it?

thanks for the response. there must be a reason for 42" plasmas all having 1024 X 768 resolution. is there a technical reason? you are right, plasmas typically don't have 1366 X 768 until they hit 50", though i found a philips 37"(50pf9956/37) plasma at 1366. 42" and lower lcd tv's typically have 1366. does 1366 necessarily make it a sharper picture? where do the brightness and contrast ratios factor in?
if espn broadcasts in 720p, is that the number of horizontal lines i receive on my set?

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My Sony 42" Is 1024 x 1024.....
by Psych Doc / January 25, 2006 8:08 AM PST
In reply to: Confusing, ain't it?

...Or so they say (lol)

It's a great set (plasma).

It's the KDE-42XS955.

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1024 X 768 etc
by acmsam / January 25, 2006 8:33 AM PST

if your sony is 1024 X 1024, does the set get a better picture than a 1024 X 768 set if the broadcasts are 720p or 1080i? that's part of my confusion.

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(NT) (NT) 1024 X 768--still looking for answers to the above
by acmsam / January 25, 2006 11:59 AM PST
In reply to: 1024 X 768 etc
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More confusion
by HTHMAN / January 25, 2006 12:59 PM PST

Since the native resolution on my plasma is 720p, that is where it should look best. But, my Dish receiver can bet set to output at 720p or 1080i and it looks much sharper at 1080i. Until they start broadcasting in 1080p, you will never receive anything that is sharper than your set can display.

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You can't receive anything better than......
by Riverledge / January 25, 2006 1:57 PM PST

The signal being transmitted. Higher numbers don't mean a lot right now. 720p is about the best you can do these days.


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1024 X 768 vs. 1366 X 768--what's the diff?
by jcrobso / January 26, 2006 12:33 AM PST

720p is 1280X720, 1080i&p is 1920X1080.
The TV is rescaling the video to fit it's display area.
A 1024X768 will have to discard some pixels, a 1366x768 will show the full 720x1280, it will have to rescale and disard pixels to show 1080i.
To show all the pixials at TV will have to be able to do 1080i. This is life in the digital world. John

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1920 X 1080 or else?
by acmsam / January 26, 2006 1:50 AM PST

sounds like only 1920 x 1080 gets the best. is there an optimal size picture for this display? should it be lcd, plasma, dlp or something else? any particular make? do stations broadcast at 1920 X 1080 today? Who?
does anyone know why the 42" plasmas seem to mostly have 1024 X 768? is there a technical reason or did this just kind of become the standard?

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720p vs 1080i
by Dan Filice / January 26, 2006 1:59 AM PST

A previous poster stated "BTW, I don't believe I've seen any 42" plasmas which go beyond 1024x768 - you have to go to 50" models for that. " My 23" Sony is rated at 1366 X 768. I understand that sets that are rated at 1080p can only be as small as 50" due to the space needed for the millions of pixels.

How does one really know what the native resolution is of their TV? My Sony says it displays 480i, 480p, 720p and 1080i. Does this mean that all of these resolutions are "native"?

My HD cable box outputs everything at 1080i, regardless of what is being broadcast. I would think that part of the picture quality problem goes beyond our individual TVs and revolves around the actual cable or satellite box that converts the signal. Also, there are many factors that affect the picture quality in this very big jugsaw puzzle of High Def. Was the original material shot at 720p or 1080i, and was it shot at 24fps or 30fps? And, do we have our TV settings adjusted so it will do the "Cinema" mode translation to get the most out of material shot at 24fps? Also, a lot of broadcasters simply up-res the SD material to "high def", which isn't really high-def and why some "high-def" material doesn't look great. So far, from what I've seen, the Discovery HD channel and PBS have the best HD material, followed by the local channels that broadcast material that actually originates in HD. Some local stations orginate material in 720p while others use 1080i. They both look good.

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Read carefully
by steve.trelease / January 26, 2006 2:49 AM PST
In reply to: 720p vs 1080i


A previous poster stated "BTW, I don't believe I've seen any 42" plasmas which go beyond 1024x768 - you have to go to 50" models for that. " My 23" Sony is rated at 1366 X 768. I understand that sets that are rated at 1080p can only be as small as 50" due to the space needed for the millions of pixels.

<end quote>

Note that I specifically stated "plasma". CRTs can certainly handle higher resolutions.

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1080i vs 720
by mtw41 / January 27, 2006 9:41 PM PST
In reply to: 720p vs 1080i

I suspect the slight difference in pixels between 720 and 768 will not make a difference. The picture will either be scaled to fit or the 24 pixels at the top and bottom will not be used. My 37 LCD has a native resolution of 1080 x 1920 and if the program material is being broadcast in true 1080i the picture is significantly better. If the program is broadcast in 720 it will be scaled to fit regardless of my cable box settings. Is 1080i better? In some respects yes but the signal being sent is interlaced (i) meaning motion is not as smooth. Plasma has better color than LCD in my opinion. I would say over all plasma is easier to watch but the resolution of true 1080i is very impressive. 1080p will be very impressive someday as long as there isn't too many compression artifacts but the only difference will be in the way it handles motion because the resolution will be exactly the same 1080i. At this point it takes twice as much information to make a 1080p picture which is the reason for interlacing in the first place. Don't let anyone tell you that the higher 1080 resolution makes no difference. The difference might not be significant enough for you to pay more money but there is a definite difference if the programming is broadcast in 1080i (HDnet is all 1080i). I would not consider a new display without 1080p at this point. (run a search "interlaced vs. progressive scan" for more detailed information.)

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who makes it
by acmsam / January 28, 2006 1:24 AM PST
In reply to: 1080i vs 720

thanks for your reply. what is make and model number of your 37 lcd tv?

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1024 X 768-- compilation of questions still outstanding
by acmsam / January 26, 2006 8:06 AM PST

i've appreciated everyone's responses. i'm not nearly as confused, but i still have some questions that i wish you all might take time to answer either singularly or altogether.
1. How many pixels does a 42" plasma 1024 X 768 really display with a 720p or 1080i broadcast? How many horizontal lines would there be? I assume there are 1024 vertical lines stretched to resemble 1366 vertical lines but i might be incorrect.
2. Is there a relationship between brightness and contrast ratios and number of native resolution or number of pixels? Are the brightness and contrast ratios of lcd's comparable to plasmas.
3. Why do 42" plasmas typically have resolutions of 1024 X 768? Is it technical, picture quality, or what?
4. Is a 1024 X 1024 42" plasma going to inherently be capable of a better picture than a 1024 X 768 42" plasma?
5. is there an internet site that has info on rescaling high def for a particular tv? see reply from jcrobso.

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by HTHMAN / January 26, 2006 8:20 AM PST

Whatever TV you get will scale the signal to your display. 720p displays all 720 lines on the screen in one pass. 1080i displays 1080 lines, but in 2 series of lines of 540, one every other line. It happens so fast that our eyes can not see it happen except in very high motion scenes and then it looks a little jagged on the edges. 720p is supposed to be smoother for fast action such a sports because it displays the information all at once. All sets will scale either signal to your display.

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scaler question
by acmsam / January 26, 2006 8:58 AM PST
In reply to: Scaler

does this mean if my tv is 1024 x 768 and the signal is 720p, that i get scaled back from 768 to 720 horizontal lines in one pass? and that 1366 vertical lines(or pixels) are scaled(stretched) to 1024?

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Good questions, will try to answer.
by jcrobso / January 26, 2006 11:48 PM PST

1.This tied to answer #3. Ok 1024X768 is horzontal pixals wide X virtical pixals high. In digital we talk about rows of pixals horzontal and virtical. The lines is realy an analog term.
2A.No. But some basic info might help. the little plasma tubes generate the light. In LCD the is a back lamp and the LCD pannel is an electronicaly controled color filter.
2B. Yes, but varies from set to set.
3. Dan realy answered this, each pixal is made of 3 very very small glass plasma tubes. It's very hard to get them small enough to get more than 1024X768 in a 42".
4. Maybe, the problem is the smaller the plasma tubes get the less light they make, ED plasma have bigger tubes so they are very bright.
5. There are 4 at the bottom of this link that will do the job and are affordable.

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good answers
by acmsam / January 27, 2006 12:46 AM PST

thanks for hanging in there on this thread and finishing it off. i'm very appreciative.
i guess my only question for clarification is if my screen is 1024 x 768 and 16:9 ratio, with a 720p or 1080i broadcast, do i have 720 or 768 pixels high?
thanks again.

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do i have 720 or 768 pixels high?
by jcrobso / January 27, 2006 2:23 AM PST
In reply to: good answers

Yes, the TV is rescaling the video to fit the screen. John

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768 pixels high--articles cut off(jcrobso)
by acmsam / January 27, 2006 2:46 AM PST

you said in the good questions reply that you were listing four resources at bottom. i only got markertek. if there were any others they were cut off.

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