Apple iPad 2 and iPhone 4 Display Shoot-Out

Dr. Raymond SoneiraofDisplayMate Technologieshas made it his mission to suss out the best smartphone , pad , HDTV , and multimedia showing from the bad with hisDisplay Technology Shoot - Out series . Here , he tackle the dispute between iPad 2 and iPhone 4 screens .

The video display on the iPhone 4 has received widespread praise include theDisplayMate Best Mobile Display Award . But the LCD display on the iPad 2 has been the field of study of many debate and rumors regarding its specs and functioning , especially the resolution and Pixels Per Inch , which is only 132 ppi compare to the iPhone 4 Retina Display ’s 326 ppi . There is no question that a higher ppi is good , but the veridical enquiry is whether the iPad 2 fork over good display carrying out when considering its damage dot and battery mogul restraint ( and also availableness in sufficient quantities for Apple ) .

In this article we will allow in - deepness objective side - by - side comparability of the display establish on detailed lab measurements and extensive view psychometric test to put the platter straight . The datum and discussions are drawn from the individual dedicated articles in our Display Technology Shoot - Out series for each equipment : theiPad 2,iPhone 4andiPhone 3GS . The older iPhone 3GS is included as a service line to show how fluid showing have evolve since 2009 .

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Results Highlights

As we show inComparison Tablebelow the display on the iPad 2 delivers almost superposable performance to the impressive iPhone 4 Retina Display . Although the iPad has a high pixel resolution than the iPhone 4 , the silver screen is much larger so the number of Pixels Per Inch is only 132 ppi compared to the iPhone 4 Retina Display note value of 326 ppi . Lower ppi makes the picture element more apparent , an effect called pixelation . The very eminent ppi is a major marketing feature article for the iPhone 4 , but it ’s actually something of an overkill ( and primarily there for App compatibility ) because existing anti - aliasing methods can successfully reduce detectable pixelation at small resolutions and ppi .

While the iPad 2 has excellent LCD video display computer hardware , there are two significant shortfalls in the O presentation software that Apple could easily specify with a software program update that would notably improve the already excellent iPad 2 display functioning .

The Current Anti - Aliasing Reduces Perceived Sharpness of Text and Graphics

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Anti - aliasing makes images appear less pixelated and sluttish to read through the precise blending of contiguous pixel capacity in software . This is especially important for text edition and graphics on the iPad because of its much lower Pixels Per Inch than the iPhone 4 . The anti - aliasing on the iPad 2 is far from state - of - the - artwork and degrades the perceived sharpness of text and graphics . You do n’t notice this same effect on the iPhone 4 because of its very eminent ppi , but the much down in the mouth ppi on the iPad needs good anti - aliasing to significantly improve perceived sharpness and rendition . This really abide out when I was reading the New York Times using Safari on the iPad 2 that was sitting right next to an Asus 1201N netbook ( also run Safari ) that has identical to the iPad 768 upright pixel reckoning , virtually identical screen height of 5.9 inch and 130 ppi . On - concealment the article were laid out in precisely the same way but the schoolbook and computer graphic looked substantially better on the netbook because of the sub - pixel anti - aliasing it uses ( called ClearType in Windows , which is Microsoft ’s effectuation of this engineering ) . What ’s more , the IPS LCD display on the iPad is much better than the LCD on the Netbook so this result is even more spectacular . It ’s very hard to show this force with a sieve shot here because the camera , your video display , and the jpg look-alike processing all contribute their own anti - aliasing and other digital artifacts .

Anti - aliasing is done in iOS computer software so Apple could ( or rather should ) supply sub - pixel anti - aliasing to the iPad , specially give the new in high spirits - upper processing enhancements that were added to the iPad 2 , and it can be done even well on the iPad than with the generic software on the Netbook . It will make a big visual betterment and take some of the unwarranted pressure off the iPad ’s current ppi .

Automatic Brightness Controls Do Not Work the right way — and the Auto Brightness hemipteron

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The Automatic Brightness controls on Smartphones and Tablets are ( in principle ) designed to appropriately sic the projection screen luminousness base on the current ambient visible light levels . This not only has a major impact on screen viewability and readability , eye solace , and fatigue , but it plays a very important role in wield display power for maximize stamp battery run time , something gold for all fluid displays . alas , Auto Brightness is very poorly implemented on all nomadic devices include the iPhone 4 and iPad 2 . This is examined in item in our BrightnessGate articleSmartphone Automatic Brightness Controls and Light Sensors are Useless . In addition , both the iPhone 4 and iPad 2 have an Auto Brightness Bug , where they lock onto the burnished ambient light sensor value that has been measure out at any point starting from the clip unit was rouse and guard that peak value even after the ambient light decreases considerably afterwards . This keep the screen to a fault lustrous for the current conditions and do in cute battery great power .

Again , this is all done in the iOS software so Apple could ( or rather should ) fix Auto Brightness for all iOS devices .

snap to embiggen chart . For further details contingent , measuring , in - depth explanation and depth psychology see reference the links aboveat DisplayMate .

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This article has been republished with permission fromDisplayMate.com .

About DisplayMate Technologies

DisplayMate Technologiesspecializes in advanced mathematical display technology optimization and precision analytic scientific display diagnostics and calibrations to deliver prominent image and picture quality and accuracy – while increasing the effective visual Contrast Ratio of the display and bring forth a high calibrated brightness level than is achievable with traditional calibration methods . This also decreases display power requirements and increase the bombardment run time in roving display . This article is a lite translation of our intensive scientific analysis of smartphone and mobile displays – before the benefits of our advanced mathematicalDisplayMate Display Optimization Technology , which can decline or improve many of the deficiencies – let in high calibrated brightness , power efficiency , effective screen demarcation , picture quality and color and gray exfoliation accuracy under both bright and subdued ambient light , and much more . Our innovative scientific optimisation can make lower cost panels wait as good or good than more expensive in high spirits performance display . For more information on our technology see the Summary verbal description of ourAdaptive Variable Metric Display Optimizer AVDO . If you are a video display or product manufacturer and want our expertness and engineering to turn your display into a spectacular one to surpass your competition thenContact DisplayMate Technologiesto memorize more .

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