Dumb question for confirmation - will my HDTV accept 1080i/p?

Forums › Home Theatre (including HTPC and EPG Collector) › Dumb question for confirmation - will my HDTV accept 1080i/p?

Batman

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#14504 7-Jul-2007 00:09

I think i know the answer but need confirmation.

My sony grandwega hdtv (lcd rear projection) says it has a resolution of "1280x720"

What happens if i force output 1080p from my computer?

A) Will it show 1080p?
B) Will it scale down to 720p?
C) (will it then lose quality)?
D) or will the tv explode (as threatened my my ATI catalyst avivo)!!!

Thanks!

tsk i've always thought the answer was B or C (as in most multiple choice quizzes!!)

Shin

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#77205 7-Jul-2007 01:17

joker97: I think i know the answer but need confirmation.

My sony grandwega hdtv (lcd rear projection) says it has a resolution of "1280x720"

What happens if i force output 1080p from my computer?

A) Will it show 1080p?

No, Only advertised as FullHD accepts 1080p signal

B) Will it scale down to 720p?

No, TV usually not equpied with down scaler

C) (will it then lose quality)?

It will just doesn't show anything

D) or will the tv explode (as threatened my my ATI catalyst avivo)!!!

May be only showing that "signal is not acceptable"

Thanks!

tsk i've always thought the answer was B or C (as in most multiple choice quizzes!!)

Shin

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#77206 7-Jul-2007 01:19

anyway, for 1080i,

720p display usually accepts 1080i thus 1080i is need less bandwidth and only needs 540 scan lines

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#77217 7-Jul-2007 09:16

As above. If you send it 1080p it will show an out of range message. It will accept 1080i or 720p. I understand that the consensus is that 720p looks better then 1080i but suggest you try this yourself.

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#77231 7-Jul-2007 11:31

cool guys i will try to send 1080p and see what happens :) fingers crossed if it explodes AMI will cover! heh heh heh ...

Shin

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#77233 7-Jul-2007 11:37

joker97: cool guys i will try to send 1080p and see what happens :) fingers crossed if it explodes AMI will cover! heh heh heh ...

If it explodes, let me know I'll buy put option of Sony on Monday morning as much as possible

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#77242 7-Jul-2007 12:43

Shin:
joker97: I think i know the answer but need confirmation.

My sony grandwega hdtv (lcd rear projection) says it has a resolution of "1280x720"

What happens if i force output 1080p from my computer?

A) Will it show 1080p?

No, Only advertised as FullHD accepts 1080p signal

This isn't entirely correct. There are many TV sets out there that are only 768 line displays that will accept a 1080p inout. The signal ends up being downscaled to 720p however so there is no real benefit in using it.

IMHO the whole 1080p issue isn't a big deal anyway. I would say that 99% of people couldn't pick the difference between a 720p and 1080p signal anyway with the possible exception of a 60" or bigger TV. 1080i on the otherhand is just terrible being interlaced and should have never been ratified as a standard.

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#77244 7-Jul-2007 13:26

1080p has one major advantage, and probably the only point of interest, and that is that film sourced movies at 1080p24 are fed from your PC/BlueRay/HD-DVD player to a digital display that supports 1080p and will therefore display that image in 1080p72 or 96 and thus avoid the only other BlueRay/HD-DVD option of going via the 1080i60 route using the distastefull 3:2 pulldown technique.

As for any resolution improvement, well I dont understand how 1080p is any better, simply the above temporal aspect is acheived. It should be noted that Blueray/HD-DVD movies are encoded as 1080p24, initial HD-DVD players will only output these 1080i60, latter players will allow 1080p24. All Blueray players will output movies at either 1080p24 or 1080i60. Video sourced BlueRay/HD-DVD material will be played out in their native 1080i50/60.

Depending on what model Sony rearpro you have will depend on it supporting 1080p24 as an input, it is my understanding that current NZ models only the SXRD models support 1080p24 as an input, the 3LCD models (as you have) only support 1080i50/60. These will also scale the 1080i50/60 input to 720p50/60 after it has been deinteraleced.

Cyril

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#77245 7-Jul-2007 13:35

BTW

With 50" Samsung DLP 720p mode with PS3 and bluetooth keyboard & mouse finally made living room web browsing possible.

My wife enjoys Trademe with this setup while she watching TV

I wonder how would it be better with 70" Sony SXRD with 1080p mode, must be fantastic

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#77264 7-Jul-2007 17:23

hi guys you've been all very helpful!

sorry i don't plan to reconnect my desktop to the rearpro anytime soon as very troublesome (both at 2 ends of the house!)

however i might get some wireless keyboard and mouse and set the thing up to play high resolution stuff ... just one more thing for you guys to debate -

connect pc-hdtv via

a) VGA cable
b) DVI-HDMI cable?

google suggests (a) give better picture.

also i thought both were digital signals correct? why is it that my 19" lcd monitor says vga cable is an analog option (as opposed to the digital which is dvi input)?

thanks again.

i'll try the 1080p and post but i doubt it'll work per product specification but the answer is yes my keen eyes WILL notice the difference on my 50". oh well :) can't win them all!

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#77265 7-Jul-2007 17:37

Shin:

I wonder how would it be better with 70" Sony SXRD with 1080p mode, must be fantastic

It is

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cyril7

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#77270 7-Jul-2007 17:49

VGA is an analog signal. HDMI essentially is the exact signal before it goes to the ADC in the video card output, this includes blanking and the whole kitchen sink.

As to which is better, well thats a $64k question, if you are feeding a CRT then the VGA is better (but then no many CRT monitors have DVI/HDMI) if its a LCD or the digital display then HDMI may be better, but there are most likely so many accumulating details in the way that the simplicity of the VGA interface may workout to give better results, but likely to be minor if any.

The biggest issue is that there are still big compatibility issues with HDMI, therefore VGA will win out for ease of interconnect overcoming any picture improvements (if any in real world implementations).

Cyril