Extra pixels?

logicturnip · 30-04-2007, 23:25

Hi,
Just a quick question, there seems to be an influx at the minute of large LCDs with a resolution of 1366x768. For 720p HD the resolution is 1280 x 720, so these displays are clearly 720 capable. However, what happens to the rest of the pixels on screen? Presumably the image is stretched, but would that not result in a loss of quality? ( like setting 800x600 on a 1024*768 native tft monitor) It is not an easy ratio to scale, how would the screen choose which of th pixels to double up?
Sorry bout all the questions, and thanks in advance
Andy

Jarrak · 01-05-2007, 00:17

The 1366*768 was dominant in the early days thanks to the production lines being biased towards PC displays, it's only recently that 1280*720 res displays have become common place.

Two options are offered..
The first is simply scaling the source to the native res of the 1366*768 panel and since all broadcast HD is 1080i then no real difference between 768 and 720 and upscaling from SD/DVD again no practical difference to the chipset that does the processing.
The other is to pixel map 1:1 a 720p source and literally leave a blank border around the image.

TallDave · 01-05-2007, 11:52

It's probably worth pointing out to owners of upscaling DVD players that unless the DVD scales to the native resolution of the TV, then the TV will have to scale again, resulting in a picture that has been scaled twice.

So owners of a 1366x768 resolution TV would probably be better off letting the TV do all the scaling.

logicturnip · 01-05-2007, 19:24

Thanks for that fellas, cleared that up for me!
Cheers
Andy

ntlhellworld · 05-05-2007, 01:14

Well all HD is currently broadcast in 1080i 1920x1080 (the exception being BBC HD which broadcasts in 1440x1080), so a 1366x768 display would still be able to show more unique pixels than a 1280x720 display.

-Chris

30-04-2007, 23:25	#1
logicturnip Forum Member Join Date: Jul 2003 Posts: 6	Extra pixels? Hi, Just a quick question, there seems to be an influx at the minute of large LCDs with a resolution of 1366x768. For 720p HD the resolution is 1280 x 720, so these displays are clearly 720 capable. However, what happens to the rest of the pixels on screen? Presumably the image is stretched, but would that not result in a loss of quality? ( like setting 800x600 on a 1024*768 native tft monitor) It is not an easy ratio to scale, how would the screen choose which of th pixels to double up? Sorry bout all the questions, and thanks in advance Andy

01-05-2007, 00:17	#2
Jarrak Forum Member Join Date: Jan 2002 Location: Ilkeston Posts: 18,075	The 1366768 was dominant in the early days thanks to the production lines being biased towards PC displays, it's only recently that 1280720 res displays have become common place. Two options are offered.. The first is simply scaling the source to the native res of the 1366*768 panel and since all broadcast HD is 1080i then no real difference between 768 and 720 and upscaling from SD/DVD again no practical difference to the chipset that does the processing. The other is to pixel map 1:1 a 720p source and literally leave a blank border around the image.

01-05-2007, 11:52	#3
TallDave Forum Member Join Date: Jul 2003 Location: West Sussex, UK (Midhurst/CP) Posts: 585	It's probably worth pointing out to owners of upscaling DVD players that unless the DVD scales to the native resolution of the TV, then the TV will have to scale again, resulting in a picture that has been scaled twice. So owners of a 1366x768 resolution TV would probably be better off letting the TV do all the scaling.

01-05-2007, 19:24	#4
logicturnip Forum Member Join Date: Jul 2003 Posts: 6	Thanks for that fellas, cleared that up for me! Cheers Andy

05-05-2007, 01:14	#5
ntlhellworld Forum Member Join Date: Dec 2004 Posts: 2,649	Well all HD is currently broadcast in 1080i 1920x1080 (the exception being BBC HD which broadcasts in 1440x1080), so a 1366x768 display would still be able to show more unique pixels than a 1280x720 display. -Chris

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Extra pixels?