Feeds

Apple iPad 3 'retina display' uses Sharp super-high aperture tech

Pixels too muddy without it

Securing Web Applications Made Simple and Scalable

What's the secret behind squeezing four times as many pixels into the same iPad screen area as Apple's display suppliers managed with the previous model and making it look better? A technology called "Super High Aperture", apparently.

SHA involves slapping a 3µm "photo-definable acrylic resin layer" on top of the display's thin-film transistors, says market watcher DisplaySearch.

This has the following effect: "to planarise the device and increase the vertical gap between the ITO pixel electrodes and signal lines".

Got that?

ITO is Indium Tin Oxide, a semiconductor that's transparent when laid down in very thin layers. It's used in ordinary LCDs too. The SHA film lifts the ITO layer up above the level of source, gate and drain parts of the transistor and their signal lines.

However, a narrow well is etched in the film down to the transistor's drain layer. This well, also coated with ITO, serves to reduce the impact of the electrical fields generated by the transistor's source and gate bus lines upon the pixel's liquid crystal orientation, which can muddy colours and blur the picture.

Sharp SHA design

Sharp's SHA design

The structure also increases the pixel's aperture ratio by narrowing the pixel's diameter relative to its focal length.

The upshot: the pixel is brighter and finer, as a greater amount of light at a more precise frequency gets through than is the case with traditional LCD pixels.

DisplaySearch note that Sharp came up with the design years ago - it's been putting out papers on it since the mid-1990s - but it's a tricky design to implement efficiently and that has held the technology back, especially since the resolutions it makes possible were not then needed.

Now they are, and Sharp is milking the tech. DisplaySearch reckons that a quarter of the LCDs shipping today use the technology. ®

Application security programs and practises

More from The Register

next story
iPad? More like iFAD: We reveal why Apple fell into IBM's arms
But never fear fanbois, you're still lapping up iPhones, Macs
For Lenovo US, 8-inch Windows tablets are DEAD – long live 8-inch Windows tablets
Reports it's killing off smaller slabs are greatly exaggerated
Microsoft unsheathes cheap Android-killer: Behold, the Lumia 530
Say it with us: I'm King of the Landfill-ill-ill-ill
Cheer up, Nokia fans. It can start making mobes again in 18 months
The real winner of the Nokia sale is *drumroll* ... Nokia
Seventh-gen SPARC silicon will accelerate Oracle databases
Uncle Larry's mutually-optimised stack to become clearer in August
EU dons gloves, pokes Google's deals with Android mobe makers
El Reg cops a squint at investigatory letters
Apple orders huge MOUNTAIN of 80 MILLION 'Air' iPhone 6s
Bigger, harder trouser bulges foretold for fanbois
prev story

Whitepapers

Top three mobile application threats
Prevent sensitive data leakage over insecure channels or stolen mobile devices.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
The Essential Guide to IT Transformation
ServiceNow discusses three IT transformations that can help CIO's automate IT services to transform IT and the enterprise.