720p Ou 1080p Qual E Melhor

Posted on
720p Ou 1080p Qual E Melhor Average ratng: 3,8/5 6850 votes

Jun 29, 2016 - HD or High Definition 720p and 1080p are high-definition resolutions, with 1080p being the best available. What does the 'p' mean, you might. Apr 16, 2019 - The 720p is probably 60 FPS, versus the 1080p that is probably 30. It to mp4 or mkv, using the best skilled technician in a super computer.

You can see the maths behind this at the bottom of the article, or you can just take a look at the GIF also below that visually demonstrates how far away from a phone you need to be start noticing pixelization. Screen size and distance are in inches.'


The new generation of Quad HD smartphones is coming. Quad HD is the common name for the new super-sharp smartphone resolution: after 720p phones’ arrival in 2011 and the jump to 1080p smartphones just last year, in 2014, we’re already bracing ourselves for the first wave of Quad HD smartphones. A few Quad HD smartphones are actually already on sale in China, but it seems that LG’s G3 will become the first truly massive smartphone with the new ultra-sharp resolution.

So what is Quad HD all about and what are the benefits it brings? As with any improvement in screen resolution, Quad HD will make smartphone screens clearer, “sharper”. The practical benefit of such a sharp display is that your eye will be able to make out the tiniest of detail in images and videos, as well as read the tiniest of fonts.
But some may ask: wasn’t that the whole point of ‘Retina’ displays way back in 2010? Hadn’t we already reached that retina-perfect picture on our devices? We’ll answer this question right away.

Screen resolution and display size: are we there yet?


Let’s first start with the iPhone 4, a smartphone that first claimed it comes with a ‘Retina’ display so sharp that the eye of a regular person no longer sees jagged pixels. The iPhone 4 was a device with a resolution of 640 x 960 pixels, but resolution alone does not tell us much about the sharpness of the display itself. After all, if you put the same resolution that looks clear on the iPhone on a 50-inch screen it would suddenly start looking not sharp at all. So instead of looking at resolution alone, it makes much more sense to look at a metric like density, calculated using both screen size AND resolution.
MelhorThe iPhone 4, for instance, featured pixel density of 326 pixels per inch (ppi, but some would also say dots per inch, or dpi).
Not long after, though, higher resolutions and pixel densities started to appear. Here are the pixel densities of some popular phones since then:
  • Apple iPhone 4-5s: 326ppi
  • Samsung Galaxy S3 (4.8-inch, 720p): 306ppi
  • Samsung Galaxy S4 (5-inch, 1080p): 441ppi
  • Samsung Galaxy Note III (5.7-inch, 1080p): 386ppi

By looking at these different phones, we can again see how screens with the same resolution have different pixel densities, and thus different sharpness.
Back in the day when Apple unveiled the iPhone 4, various reports suggested that anything above roughly 300ppi is good enough for the human eye to perceive as clear and sharp. Why then screen resolutions continued growing and growing until present-day Quad HD devices?
The latest Quad HD smartphones come (or are expected to arrive) with a pixel density as high as (the seemingly unnecessary) 534ppi! Is it really just new technology for nothing?

The third factor: viewing distance


There is another key factor that should be considered when we speak about display sharpness and clarity, though, but it’s often left out of the conversation. We’re speaking about viewing distance. Even the sharpest of TVs and the sharpest of phones starts to look flawed when you look at it from a very close distance. Look at the same device from a 1-foot distance and the clarity of the picture suddenly becomes better. Look at it from further away, and the picture would appear perfectly sharp and clear.
The question that we will answer today then is: at what viewing distance one starts actually seeing the benefit of high-res displays?

The ideal viewing distance


To measure the ideal distance between you and your smartphone display, we’ll assume you are one of the rare few who have very good vision. You’d often hear about such vision being called 20/20 vision. A person with 20/20 vision is one who can discern detail of 1 arc minute (1 arc minute = 1/60 of a degree = a circle has 360 degrees, so 1 arc minute = 1/21600th of a full circle). Most people have worse vision than that - for instance someone with 20/40 vision can only discern detail of 2 arc minutes, while the rear few (think jet pilots) with 20/10 vision can discern detail of 0.5 arc minutes. The actual limit of human vision is around 20/8, so again, we’re assuming a fairly optimistic 20/20 vision scenario.
So with all that in mind, how close do you need to be start seeing those pixels and details on even a Quad HD smartphone? And what about 1080p phones, and 720p devices? Take a look below:
  • Typical 480p (4” display like Galaxy S III Mini): eye starts to notice pixelization from 14.73” (37.4cm)
  • Typical 720p phone (4.7” display like Nexus 4): eye starts to notice pixelization from 11” (28cm)
  • Typical 1080p phone (5” display like Galaxy S5): eye starts to notice pixelization from 7.8” (19.8cm)
  • Typical 1440p phone (5.5” display like expected LG G3): eye starts to notice pixelization from 6.44” (16.4cm)

480p, average person starts noticing pixelization at around 14.7 inches (here - 37.4cm) in a 4-inch 480p phone

720p, average person starts noticing pixelization at around 11 inches in a 4.7-inch 720p phone

1080p, average person starts noticing pixelization at around 7.8 inches in a 5-inch 1080p phone

Quad HD, average person starts noticing pixelization at around 6.44 inches in a 5.5-inch 1440p phone

720p Ou 1080p Qual E Melhor Bros 160 Ou Titan 160

We've used a ruler with metric units (centimeters, rather than inches)

*we’ve used the following formulas to calculate those distances:
VIEWING DISTANCE = 1 / PPI / (2 * Tan (VISUAL RESOLUTION / 2))
PPI = X / sqrt (W ^ 2 / ((Y / X) ^ 2 + 1))), where x = horizontal resolution, y = vertical resolution, w = screen size
VISUAL RESOLUTION = (1 / VISUAL ACCUITY) * (1 / 60)
We’ve assumed 20/20 VISUAL ACCUITY

Conclusion


In conclusion, we ought to put a few disclaimers to all this. We've tried to keep it as scientifically accurate as possible, but we ought to remember that our eyes and our human vision is more complex and the actual way we see things is a lot about how the brain processes images. And that's something that is hard to measure right now.
With this in mind, we'll lay it out in very simple terms: theoretically, you need to look at your 5.5-inch Quad HD from as close as 6.4' for your eyes to start noticing pixelization (if you have 20/20 vision, if not you'd need it even close). At regular viewing distances it's practically impossible to notice the difference in sharpness between say the 1080p Galaxy S5 and the future Quad HD flagships.
Not very encouraging, is it? We, however, can still hope that theory is not all to it, and will put it all to the test very soon as the first Quad HD phones are expected to hit the market in the coming months. Stay tuned!
reference: Carlton Bale, jaredjared.com
Second image is courtesy of CNET.

107 Comments

1.StraightEdgeNexus

Posts: 3689; Member since: Feb 14, 2014

I cant see the difference :-( ................

posted on Apr 30, 2014, 9:54 AM 14

45.proto

Posts: 59; Member since: Sep 12, 2012

well, when i replace galaxy nexus (4,65' 720p) with Galaxy S4 (5' 1080p) it was realy hard to find difference even side by side from normal veawing distance, I had to go to 'recent apps' menu to finally see some differnece. No needto say theat both have pentile pixell arrangement.

posted on Apr 30, 2014, 1:20 PM

posted on Apr 30, 2014, 1:42 PM 0

79.Epicness1o1

Posts: 301; Member since: May 30, 2013

I jumped many times when I was playing basketball ^^

posted on May 29, 2014, 10:14 AM

posted on May 30, 2014, 6:08 AM 1

81.DanishDynamite

Posts: 47; Member since: Feb 28, 2013

UHD is 4K...

posted on May 29, 2014, 10:26 AM 0

50.akki20892

Posts: 3902; Member since: Feb 04, 2013

Don't try to judge me.....http://www.jigsawexplorer.com/puzzles/subjects/eye-of-the-eagle-344x300.jpgI'm sure this buddy can notice pixels really well.This buddy need 5' with 1,000,000K.

posted on Apr 30, 2014, 1:34 PM

posted on Apr 30, 2014, 5:05 PM 3

76.KDNISS

Posts: 4; Member since: May 12, 2014

Stupid people do not understand the Math :)

posted on May 12, 2014, 8:29 AM 3

97.zunaidahmed

Posts: 1183; Member since: Dec 24, 2011

I guess u r struggling..... 4 out of 3, it should be 3 out of 4......lol

posted on May 29, 2014, 11:07 PM 2

106.iampayne

Posts: 322; Member since: Aug 12, 2013

The Joke_________Your Head

posted on Jun 13, 2014, 1:35 PM

posted on Jul 21, 2014, 7:08 AM 720p Ou 1080p Qual E Melhor Creme Para Bebe

64.jcdz89

Posts: 78; Member since: Mar 01, 2013

1080p enough for phones.. 1440p enough for large tab. .that's it

posted on Apr 30, 2014, 11:41 PM 0

88.Kamehameha

Posts: 44; Member since: Apr 21, 2014

'on SGS3 720p, the games look very sharp. but on note3 1080P, the games graphic look softer'Pics or it didn't happen.

posted on May 29, 2014, 1:25 PM 0

94.Neo_Huang

Posts: 1067; Member since: Dec 06, 2013

I think they replaced Oppo Find 7 with LG G3 as the example of a 2K phone.

posted on May 29, 2014, 6:37 PM 0

3.Antimio

Posts: 313; Member since: Nov 11, 2013

Amazing explanation. Thank you Guys for taking your time. Honestly, I don't mind having a 720p or 1080p. Nexus 4 and Moto X here, and pretty happy with them.

posted on Apr 30, 2014, 9:56 AM

posted on Apr 30, 2014, 10:42 AM 0

4.MalakiMills

Posts: 257; Member since: Jun 15, 2010

I think 1080p is the sweet spot for smart phone displays right. I generally stay away from the idea that there is a 'cap' on any sort of advancement, and I do think displays can still be improved upon. Resolution however is good where it is. I'd rather see things like battery, graphics, camera, and software optimizations continue to be pushed ahead with priority over displays.

posted on Apr 30, 2014, 9:57 AM 5

* Some comments have been hidden, because they don't meet the discussions rules.

720p Vs 1080p 32 Inch

Want to comment? Please Log in or sign up.

Send a warning to Selected user. The user has 0 warnings currently.
Next warning will result in ban!

Message to PhoneArena moderator (optional):

Latest Stories