'Retina Display' SFnally Perfect (Almost)
Apple's new retina display is certainly the highest resolution cell phone display evar. But is it really so perfect that the human retina is unable to distinguish pixels - that is, is it as good as reality?
Keep in mind that many science fiction writers need this level of display in order to present what are now called 'virtual realities' that are indistinguishable from the real world. Ray Bradbury's Veldt from The Illustrated Man and the Saga adventures from Arthur C. Clarke's 1956 novel The City and the Stars and the Star Trek: TNG holodeck require a display that is as good as reality.
Here's how Apple sets forth their argument:
... the Retina display’s pixel density is so high, your eye is unable to distinguish individual pixels.
By developing pixels a mere 78 micrometers wide, Apple engineers were able to pack four times the number of pixels into the same 3.5-inch (diagonal) screen found on earlier iPhone models. The resulting pixel density of iPhone 4 — 326 pixels per inch — makes text and graphics look smooth and continuous at any size.
Here's what the docs at MedGadget have to say:
The maximum spatial resolution (ability to differentiate two points) of the human eye occurs at the center of the visual field, corresponding to the fovea of the retina. At the fovea, the cone cells (there are no rods in the fovea) are jammed up close together at the highest density of the retina. Knowing this we can calculate the smallest pixels the fovea should be able to differentiate, but it takes a couple assumptions that we will lay out. The reader is encouraged to re-calculate the following based on their affinity for Apple.
1) Assuming 20/20 vision with bright lights and adequate contrast, the fovea has the ability to differentiate points around 1 arc-minute apart.
2) Assuming the user holds the phone at 1 foot (0.305 m) from their eyes, 1 arc-minute corresponds to 89 micrometers.
3) Apple's claim of 78 micrometers is smaller than 89 micrometers, however 2 points are needed to differentiate, so that is 78 x 2 = 156 micrometers, which is not.
Also, depending on the literature, there are claims the fovea can determine points 0.5 arc-minute apart, which is 44 micrometers. Regardless, it is close, and the user is unlikely to always be in perfect light or always using foveal vision and resolution drops off pretty dramatically a very short distance along the retina from the fovea.
From Apple, MedGadget and take a look at this very cool page on visual acuity.
Scroll down for more stories in the same category. (Story submitted 6/9/2010)
Follow this kind of news @Technovelgy.
| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |
you like to contribute a story tip?
Get the URL of the story, and the related sf author, and add
Comment/Join discussion ( 0 )
Related News Stories -
LG Rollable Version Of Niven's Poster TV
'A television that unrolled like a poster.' - Larry Niven, 1976.
Foldable Galaxy Phones, I Swear They're Coming (Maybe)
Apparently, it is very hard to do. We've been patient, though.
WatchSense Perfect For Fat-Fingered Smartwatch Owners
'Now all you had to do was wave your hand in the general direction of the components...' - Douglas Adams, 1979.
Transparent OLED TV By Panasonic
It's the look of things to come.
Technovelgy (that's tech-novel-gee!)
is devoted to the creative science inventions and ideas of sf authors. Look for
the Invention Category that interests
you, the Glossary, the Invention
Timeline, or see what's New.
GM Introduces Cruise AV With No Steering Wheel
'How about the steering wheel?' ... 'I do not need one.'
Subsurface Martian Ice Slabs Piece Of Cake For Miners
'One shy little fellow with bloodshot eyes of old-time drillman stood up. 'I'm an ice miner,' he said.'
LG Rollable Version Of Niven's Poster TV
'A television that unrolled like a poster.'
Multi-Robot Farming On Highly Sloped Land
High Plains, indeed.
Aeolus Robot Brings Jetson's Rosie Closer
Domestic duties, robotically performed.
Sony's New, Cuter Aibo Robot Puppy
Engineered to be adorable.
Earth-1 Transformer Gundam Car
Is it a Gundam? Or maybe a Transformer.
Self-Driving Domino's Pizza Car
Yes, but can it negotiate entry at your Burbclave?
I Want Massive Space Freighters!
Ah, the space freighters of old.
When Will The Feds Ban Human Drivers?
'The first laws came out forcing the old machines off the highways...'
Our World Formed In A Bubble?
'The Worldcraft bubble glittered, catching the light...'
Will You Live To See EM Pulse Scattering By Ships Nearing Light Speed?
'...half a million kilometers away, the Stardrive went on.'
Jabil Integrated Textile Heart Monitoring
'Della's first present was an imipolex sweatshirt called a heartshirt…'
Made In Space To Manufacture Optical Fiber In Orbit
'Mass-produced only in the orbiting factories...'
Dune Fans! Power Your Devices With Sweaty Shirts
Yet another power source from humans.
Orwell's Memory Hole Looms Larger Thanks To Nvidia
'All history was a palimpsest, scraped clean and reinscribed exactly as often as was necessary.'
More SF in the News Stories
More Beyond Technovelgy science news stories