PCMag ran the Evo, the Droid X, the Incredible and the iPhone 4 through a gauntlet of tests to determine which really has best display. Here's what DisplayMate President Dr Raymond Soneira has to say about the results.
PCMag tested the displays for brightness, contrast, colour depth and colour accuracy. The iPhone 4's came out on top, though the Droid X wasn't far behind.
The article by PJ Jacobowitz "Is the iPhone's LCD the Best?" on PCMag.com with lab measurements comparing four high-end smartphone displays is especially interesting because it has the first published lab results for the iPhone 4 Retina display. Below are my own comments for some of the PCMag article results.
The iPhone 4 is 25 per cent brighter than the iPhone 3GS, which was the previous record holder, so the iPhone 4 is now the brightness king for smartphones.
Steve Jobs promised a Retina display Contrast Ratio of 800 and PCMag measured 1097, 37 per cent more than the Apple advertised spec. That's very impressive because you seldom ever see manufacturers conservatively understate their specs to that degree - but then see my widely reported (and often misquoted) comments on the iPhone 4 Retina Display, where it falls short on that spec. The iPhone 4 is a tremendous improvement over the iPhone 3GS, which only had a measured Contrast Ratio of 138. But note that the Motorola Droid remains the Contrast Ratio king of mobile LCDs with 1436, which I measured in our own DisplayMate Lab tests.
The PCMag lab test result that really surprised and disappointed me was the small iPhone 4 display colour gamut, which is only 64 per cent of the industry sRGB/Rec.709 standard colour gamut that is necessary to obtain accurate colour reproduction for videos and photos. As a result all iPhone 4 images will have colours that are somewhat under-saturated and on the weak side. The same was true for the iPhone 3GS and all previous iPhones and iPods. I was really expecting the iPhone 4 to correct that deficiency and perform as well as the Motorola Droid, an IPS LCD that matches the standard colour gamut almost exactly and delivers essentially perfect colour accuracy images, as good or better than most HDTVs. So the iPhone 4 is disappointing in colour saturation and colour accuracy, but is state-of-the-art in pixel resolution and sharpness.
On the other hand, the PCMag lab tests found that the HTC Droid Incredible had way too large a colour gamut and colour saturation, the same as the Nexus One and most OLED displays on many phones. While that often gets an initial "wow" response – even from reviewers who should know better – too much image colour and colouration in photos and videos is actually visually worse than too little colour. So the iPhone 4's less than ideal weak colour is actually visually better and preferable to all of those OLED displays that have excessive colour – unless you prefer gaudy coloured images.
While the iPhone 4 LCD has a significantly lower Contrast Ratio than OLEDs, which typically have Contrast Ratios of 30,000 or more, it's not particularly relevant for mobile displays because they are typically viewed under bright ambient lighting, where screen reflections of the surrounding ambient light are much greater than the display's own internal black level. The Contrast Ratio spec only applies for viewing in the dark. The iPhone 4's bright screen and low reflectance means that it delivers a much higher REAL screen image Contrast under typical ambient lighting than OLEDs, which are not as bright and have inherently higher screen reflectance than the iPhones. But in dark ambient lighting the OLEDs deliver outstanding Contrast.
In the near future I will be reporting on our own intensive DisplayMate iPhone 4 display lab tests, with in-depth evaluations and analysis and some comments on how manufacturers can improve their mobile displays.
Dr. Raymond Soneira is President of DisplayMate Technologies Corporation of Amherst, New Hampshire, which produces display optimisation, calibration, evaluation and diagnostic products for consumers, technicians and manufacturers that are also used by hundreds of publications worldwide for editorial reviews for every type of display.