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iPad 2015 Display Technology Shoot-Out

iPad mini 4 and iPad Air 2 and iPad Pro

 

Dr. Raymond M. Soneira

President, DisplayMate Technologies Corporation

 

Copyright © 1990-2015 by DisplayMate Technologies Corporation. All Rights Reserved.

This article, or any part thereof, may not be copied, reproduced, mirrored, distributed or incorporated

into any other work without the prior written permission of DisplayMate Technologies Corporation

 

 

iPad mini 4

iPad Air 2

iPad Pro

 

Introduction

The key element for a great Tablet has always been a truly innovative and top performing display, and the best leading edge Tablets have always flaunted their beautiful high tech displays.

 

For 2015 there is a new broad product line of iPads – from the small mini up to the new large Pro model, with display sizes that span almost 3 to 1 in screen area. The displays have different applications and performance criteria that we will measure and analyze below. The differences and similarities in performance between the 3 iPad displays are really interesting and surprising...

 

The Tablet revolution began with the launch of the first iPad in 2010, and over the years the iPad displays have taken the lead with several major innovations, but they have also periodically lagged behind the displays on competing Tablets. Looking back, the iPad displays have gotten major performance enhancements every two years (just like the iPhones but without the S designations). To understand the various performance aspects of the latest iPad displays we’ll first take a look at how they have evolved…

 

Early 9.7 inch iPads in 2010 – 2013

For 2010, the original iPad had a [1.0] leading edge 1024x768 display with 132 Pixels Per Inch (ppi) and a smallish 62 percent Color Gamut that had noticeably lower color saturation. The next [2.0] cutting edge development for Tablet displays arrived in 2012 on the iPad 3, which not only doubled the resolution and ppi up to what Apple classifies as a Retina Display, but also provided a much larger 99 percent Color Gamut, which delivered full color saturation images.

 

Up through 2013 all of the iPads had relatively high screen reflections, primarily from an air gap between the outer cover glass and the display, resulting in a high Reflectance of 8.7 percent of the ambient light falling on the screen, which was reduced with each succeeding generation down to 6.5 percent for the iPad Air 1 in 2013. That may seem like a small percentage difference, but it is their ratio that matters, so 6.5 percent reflects 25 percent less ambient light than 8.7 percent.

 

iPad Air 2 in 2014

The next [3.0] cutting edge development for Tablet displays arrived in 2014 on the iPad Air 2, which received a very innovative low Reflectance screen that reflects just 2.5 percent of the ambient light by using a new Anti-Reflection AR coating (together with eliminating the air gap). While this was overlooked by most consumers, reviewers, and (even) manufacturers, it was a major enhancement that reduced the reflected light glare from the screen by a very impressive 62 percent compared to the iPad Air 1 (and even more for the earlier iPads).

 

Reflected ambient light washes out the on-screen images, reducing both their contrast and color saturation. Since [almost] no one looks at the screen in absolute darkness, that 62 percent decrease in Reflectance significantly increases the actual on-screen image contrast that you see in typical ambient light by an incredible factor of 2.6X, and that also improves on-screen color saturation. Stated another way, the earlier iPads had less than 38 percent of the visual display contrast compared to the iPad Air 2 in typical ambient light. The difference is very easy to see in side-by-side visual comparisons, particularly when the displays are turned off so you just see the light reflected by the screens.

 

A lower screen Reflectance also allows you to reduce the display brightness setting in ambient light, which saves power and increases running time on battery. Lowering screen Reflectance is a major display performance improvement for real world viewing conditions!

 

Early 7.9 inch iPad minis in 2012 – 2014

The much anticipated smaller 7.9 inch iPad mini 1 launched in 2012, but the mini’s display performance has always lagged the full size 9.7 inch iPads by 1 to 2 generations. In 2013, the mini 2 was upgraded to a Retina Display but still only received the lower 62 percent Color Gamut, which also continued for the mini 3 in 2014. The mini screen Reflectance was even higher than the full size iPads. The iPad mini was treated like the runt of the litter, but it has now found favor and been transformed into a beautiful leading edge display on the new iPad mini 4…

 

The iPads for 2015

For 2015, all of the current iPad displays have all of the enhancements mentioned above. The iPad Air 2 continues on as the current 9.7 inch model, the new 7.9 inch iPad mini 4 has received a slew of major display performance improvements, and there is the brand new iPad Pro with a much larger 12.9 inch display that is intended primarily for professional and advanced imaging applications (and promoted as a laptop replacement).

 

The differences and similarities in performance between these 3 current iPad displays are really interesting and surprising... We’ll cover these issues and much more, with in-depth comprehensive display tests, measurements and analysis that you will find nowhere else.

 

The Display Shoot-Out

To examine the performance of the iPad mini 4, the iPad Air 2, and iPad Pro displays we ran our in-depth series of Mobile Display Technology Shoot-Out Lab tests and measurements in order to determine how these latest LCD Tablet displays have improved. We take display quality very seriously and provide in-depth objective analysis based on detailed laboratory tests and measurements and extensive viewing tests with both test patterns, test images and test photos. To see how far mobile displays have progressed in just five years see our 2010 Smartphone Display Shoot-Out, and for a real history lesson see our original 2006 Smartphone Display Shoot-Out.

 

Results Highlights

In this Results section we provide Highlights of the comprehensive DisplayMate Lab tests and measurements and extensive visual comparisons using test photos, test images, and test patterns that are covered in the advanced sections. The main Display Shoot-Out Comparison Table summarizes the iPad mini 4, the iPad Air 2, and iPad Pro Lab measurements in the following categories:  Screen ReflectionsBrightness and ContrastColors and IntensitiesViewing AnglesLCD SpectraDisplay Power. You can also skip these Highlights and go directly to the iPad Conclusions.

 

Overview of the iPads

All of the iPads have similar high performance IPS LCDs, but with different performance enhancements. The iPad Air 2 and iPad Pro both have Photo Aligned LCDs, which provides higher Contrast Ratios than the traditional and more common mechanical alignment on the iPad mini 4. On top of that, the iPad Pro has a Metal Oxide TFT Backplane that increases the light throughput for the panel and therefore increases its power efficiency, which is particularly important for such a large mobile LCD panel with a Backlight that needs lots of battery power to keep all of its LEDs shinning.

 

All of the iPads have Retina Displays, which means that their pixels are not resolved with normal 20/20 Vision at their typical viewing distances. The smaller iPad mini 4 has a higher 326 Pixels Per Inch (ppi) because it is typically viewed closer than the larger iPad Air 2 and iPad Pro, which have 264 ppi. All the iPads appear perfectly sharp at their typical viewing distances.

 

Because the iPad Pro has a much larger screen size, its ppi results in a significantly higher resolution of 2732 x 2048 pixels, versus 2048x1536 pixels for the iPad mini 4 and iPad Air 2. All of the iPads have a horizontal to vertical screen Aspect Ratio of 4:3, which is the same as standard 8.5 x 11 inch paper documents (with 0.5 inch borders). Their most important and significant difference is the almost 3 to 1 range in screen area.

 

Display Brightness and Contrast Ratio

All of the iPads have fairly high Maximum Brightness, from 415 cd/m2 (nits) for the iPad Air 2, to 424 nits for the iPad Pro, and 450 nits for the iPad mini 4. High screen Brightness is only needed when in High Ambient Light, so most of the time the Brightness should be set lower than the maximum.

 

The Display’s Maximum Contrast is the Ratio between its Peak White Brightness (Luminance) and its darkest Black Luminance, one of the more important measures of LCD performance quality. All of the iPads have fairly high True Contrast Ratios, from 967 for the iPad mini 4, to 1,064 for the iPad Air 2, up to a very impressive 1,631 for the iPad Pro, the highest we have ever measured for an LCD Tablet display. Note that some manufacturers list a much higher (Dynamic) Contrast Ratio for their LCDs, but that is just meaningless marketing puffery. See the Brightness and Contrast section for measurements and details.

 

Color Gamut and Absolute Color Accuracy

Good Color Accuracy is particularly important for Tablets because they provide much larger images than smartphones. Their accuracy has been steadily improving as the result of providing close to 100 percent Color Gamuts and more manufacturers are now using fully automated color calibration with instruments at the factory instead of having assembly workers visually tweaking the colors.

 

Producing high Absolute Color Accuracy is incredibly difficult because everything on the display has to be done just right. In order to deliver accurate image colors, a display needs a 100 percent sRGB / Rec.709 Standard Color Gamut that is used for producing virtually all current consumer content for digital cameras, HDTVs, the internet, and computers, including photos, videos, and movies. The iPad mini 4 has a very accurate 101 percent Color Gamut, while the iPad Air 2 and iPad Pro have slightly too large 105 to 107 percent Color Gamuts, primarily from over saturated Blue primaries, which reduces their Color Accuracy. See this Figure for the measured Color Gamuts.

 

In order to produce high Absolute Color Accuracy a display also needs an accurate (pure logarithmic power-law) Intensity Scale, and an accurate White Point. The new iPads have fairly accurate Intensity Scales with Gammas fairly close to the 2.2 standard, however, they all have slightly bluish White Points, with Color Temperatures of 7,109K to 7,355K, which is still (marginally) Very Good but reduces their overall Color Accuracy somewhat because the White Point also affects all of the low saturation colors in the Color Gamut. See this Figure for a plot of the measured Intensity Scales and the Colors and Intensities section for measurements and details.

 

The iPad mini 4 has a very impressive Absolute Color Accuracy with Average/Maximum Color Errors of 1.9 and 4.2 JNCD – tied for first place in Absolute Color Accuracy with the Microsoft Surface Pro 4. The iPad Pro is somewhat less accurate, but still (just barely) Very Good, with Average/Maximum Color Errors of 2.6 and 6.6 JNCD. The iPad Air 2 has noticeably lower Absolute Color Accuracy with Average/Maximum Color Errors of 3.9 and 8.8 JNCD, which are visually noticeable and could be unacceptable for some color critical applications (like medical imaging, high-end digital photography, product sales demonstrations, and advertising proofs, for example)

 

See this Figure for an explanation and visual definition of JNCD and the Color Accuracy Plots showing the measured display Color Errors. See the Color Accuracy section and the Color Accuracy Plots for measurements and details.

 

Screen Reflectance and Performance in Ambient Lighting

The screens on all displays are mirrors that reflect light from everything that is illuminated anywhere in front of the screen (especially anything behind the viewers), including lamps, ceiling lights, windows, direct and indirect indoor and outdoor sunlight, which washes out the on-screen colors, degrades image contrast, and interferes with seeing the on-screen images. The lower the Screen Reflectance the better. In fact, decreasing the Screen Reflectance by 50 percent doubles the effective Contrast Ratio in Ambient Light, so it is very important.

 

To visually compare the differences in screen Reflectance for yourself, hold any Tablets or Smartphones side-by-side and turn off the displays so you just see the reflections. Those reflections are still there when you turn them on, and the brighter the ambient light the brighter the reflections.

 

A major innovation for all of the current iPads is an Anti-Reflection AR coating on the cover glass that reduces ambient light reflections by about 3:1 over most other Tablets and Smartphones (including the previous iPads), and about 2:1 over all of the very best competing Tablets and Smartphones.

 

Right now all 3 current iPads are the unrivaled record holders for display performance in ambient light as a result of their record low screen Reflectance of 2.0 to 2.6 percent, significantly lower than the 4.5 to 6.5 percent Reflectance found in all other current competing Tablets. The iPad mini 4 is the best at 2.0 percent, with the iPad Air 2 at 2.5 percent and the iPad Pro at 2.6 percent.

 

Our Contrast Rating for High Ambient Light quantitatively measures screen visibility under bright Ambient Light – the higher the better. As a result of its high Brightness and very low Reflectance, the iPad mini 4 has a Contrast Rating for High Ambient Light of 225, by far the highest that we have ever measured. The iPad Air 2 has 166 and the iPad Pro has 163. See the Screen Reflections and Brightness and Contrast sections for measurements and details.

 

Viewing Angle Performance

While Tablets are primarily single viewer devices, the variation in display performance with Viewing Angle is still very important because single viewers frequently hold the display at a variety of viewing angles, plus they are large enough for sharing the screen with others. The angle is often up to 30 degrees, more if it is resting on a table or desk.

 

The iPads all have IPS LCD displays, so we expected them to show very small color shifts with Viewing Angle, and our lab measurements confirmed their excellent Viewing Angle performance, with no visually noticeable color shifts.

 

The display’s Contrast Ratio also changes with Viewing Angle, and at 30 degrees the iPad Pro maintained its high Contrast Ratio with 1,015 in Portrait mode and 974 in Landscape mode, the highest we have ever measured for an LCD Tablet. The iPad Air 2 and iPad min 4 Contrast Ratios at 30 degrees were both in the 400 to 650 range, which are much lower but still Very Good for mobile displays.

 

However, all LCDs do have a strong decrease in Brightness (Luminance) with Viewing Angle, and all of the iPads showed (as expected) a 55 to 60 percent decrease in Brightness at a modest 30 degree viewing angle. See the Viewing Angles section for measurements and details.

 

Viewing Tests

The iPads all provide very nice, pleasing and accurate colors and picture quality. The very challenging set of DisplayMate Test and Calibration Photos that we use to evaluate picture quality looked Beautiful, even to my experienced hyper-critical eyes.

 

But in side-by-side visual comparisons of all 3 iPads, it was clear that the iPad mini 4 provided the best and most accurate colors and image contrast over a very wide range of photo and image content – the result of its high Color Accuracy and very accurate Intensity Scale. See Figure 2 and Figure 3 and the Colors and Intensities section for quantitative details.

 

Display Power Efficiency

There are many factors that affect a display’s power efficiency, including the type of the White LEDs that are used, the optics and optical films in the Backlight, the circuit technology in the LCD Backplane, and the Pixels Per Inch.

 

After measuring the power used by each display, we scaled them all to the same screen brightness (Luminance) and the same screen area in order to compare their Relative Power Efficiencies. The Display Power Efficiencies for the iPad mini 4 and iPad Pro are 22% to 33% higher than the iPad Air 2.

 

The iPad Pro is the most power efficient of the iPads for two reasons: it has a Metal Oxide Backplane, which increases the light throughput for the panel, and the display uses a lower refresh rate when the images remain static (like during our power measurements). See the Display Power section for measurements and details.

 

 

Figure 1

Color Gamuts

Click to Enlarge

 

Figure 2

Color Accuracy

Click to Enlarge

 

Figure 3

Intensity Scale

Click to Enlarge

 

 

Conclusions for the 2015 iPads:   All Very Good to Excellent Top Tier Displays…

The primary goal of this Display Technology Shoot-Out article series has always been to publicize and promote display excellence so that consumers, journalists and even manufacturers are aware of and appreciate the very best in displays and display technology. We point out which manufactures and display technologies are leading and advancing the state-of-the-art for displays by performing comprehensive and objective scientific Lab tests and measurements together with in-depth analysis. We point out who is leading, who is behind, who is improving, and sometimes (unfortunately) who is back pedaling… all based solely on the extensive objective careful Lab measurements that we also publish, so that everyone can judge the data for themselves as well…

 

The Conclusions below summarize all of the major results. See the main Display Shoot-Out Comparison Table for all the DisplayMate Lab measurements and test details, and see the Results Highlights section above for a more detailed introduction and overview with expanded discussions and explanations.

 

The 2015 iPad Displays

The new product line of iPads now includes small, medium, and large displays, with sizes that span almost 3 to 1 in screen area. The displays have different applications and performance criteria. The differences and similarities in performance between the 3 iPad displays are really interesting and surprising...

 

The nicest surprise this year is the tremendous improvement in the display quality and performance of the iPad mini 4 after the poor showings of previous minis – the mini 4 is now very impressive and breaks many Tablet display performance records. The iPad Pro has also made a strong entrance and first appearance.

 

As we analyze in detail below, the iPad mini 4 and iPad Pro both deliver uniformly consistent all around Top Tier display performance: two of a small number of displays to ever to get all Green (Very Good to Excellent) Ratings in all test and measurement categories (except for Brightness variation with Viewing Angle, which is the case for all LCDs) since we started the Display Technology Shoot-Out article Series in 2006, an impressive achievement for a display. The iPad Air 2 missed the all Green performance cut as the result of its lower Yellow Absolute Color Accuracy (discussed below).

 

Right now all the iPads are the unrivaled record holders for display performance in ambient light as a result of their record low screen Reflectance of 2.0 to 2.6 percent, significantly lower than the 4.5 to 6.5 percent Reflectance found in all other current competing Tablets. As a result, the iPads provide by far the highest on-screen image Contrast in ambient light and the highest Contrast Rating for High Ambient Light of all current Tablet displays. In the Next Generation of Displays section below we’ll explain how the display performance in ambient light can be further significantly improved.

 

Below we individually cover and analyze the display performance of iPad mini 4, iPad Air 2, and iPad Pro displays

 

iPad mini 4

The iPad mini 4 is close to being a textbook perfect LCD display in all of the Lab measurements and viewing tests. Among the iPads it takes first place and is marked Best in every single test category except Contrast Ratio – where it has a Very Good but not the highest Contrast Ratio of 957 in 0 lux (because Apple didn’t provide a Photo Aligned LCD like on the Air 2 and Pro).

 

Among all existing Tablets of any size, the iPad mini 4 takes first place and breaks performance records in many of the most important test categories including: lowest screen Reflectance (2.0 percent), Highest Contrast Rating in High Ambient Light (225), a near perfect Log-Straight Intensity Scale and Gamma of 2.22, and the highest Absolute Color Accuracy (Average/Maximum Color Errors of 1.9 and 4.2 JNCD – tied for first place with the Microsoft Surface Pro 4). If Apple hadn’t intentionally made the display’s White Point so bluish (7,109K instead of 6,500K) then the Color Errors would have been even smaller.

 

There is just one qualification… if you will be viewing dark content or need perfectly dark Black Levels, then an OLED display like the Samsung Galaxy Tab S 8.4 will perform much better than an LCD display.

 

The iPad mini is small but has a gorgeous display – unquestionably the best and most accurate LCD Tablet display that we have ever tested. If a 7.9 inch display is big enough, the iPad mini 4 is the best! See the Display Shoot-Out Comparison Table for all of the measurements and details.

 

iPad Air 2

The iPad Air 2 has a Very Good display overall, but for almost all of the tests and measurements it came in somewhat behind both the iPad mini 4 and Pro – both are new for 2015 while the Air 2 was introduced in 2014, and the unit we tested was our original from 2014. It is certainly possible that the 2015 iPad Air 2 production units have been improved, but we have not seen that on previous iPad and iPhone models carried over from year to year.

 

While the iPad Air 2 performed very well overall, it did not take first place in any of the tests, which is actually a nice demonstration of the steady improvements in displays and display technology from year-to-year. It came in a solid second place only once, with a Contrast Ratio of 1,064, 11 percent higher than the mini 4 (which lacks a Photo Aligned LCD) but 35 percent behind the record high 1,631 for the iPad Pro. In all other tests it was either tied for second or a close behind third.

 

The one category where the iPad Air 2 received a disappointing Yellow grade, was in Absolute Color Accuracy, where it had Average/Maximum Color Errors of 3.9 and 8.8 JNCD, which are visually noticeable and could be unacceptable for some color critical applications (like medical imaging, high-end digital photography, product sales demonstrations, and advertising proofs, for example). If better Absolute Color Accuracy is important then for this screen size consider the Samsung Galaxy Tab S 10.5 with Average/Maximum Color Errors of 2.1 and 4.0 JNCD or the Microsoft Surface 3 with 2.2 and 4.5 JNCD.

 

If Absolute Color Accuracy is not critical then the iPad Air 2 has a Very Good all around medium size Tablet display. See the Display Shoot-Out Comparison Table for all of the measurements and details.

 

iPad Pro

The iPad Pro is a large Tablet, with almost double the screen area of the iPad Air 2, and almost triple the area of the iPad mini 4. Many professional and imaging applications need or can benefit from a large display that you can easily carry around, lay flat on a table, just hold, or rest on your lap. But to qualify as a Professional grade display it needs to provide top image quality and accuracy.

 

The iPad Pro display performed very well in all of our tests and measurements, earning Very Good to Excellent in all test categories, performing not quite as well as the iPad mini 4, but it came in or tied for second place in every test except True Contrast Ratio in 0 lux, where it is the definitive winner and marked Best with a record 1,631.

 

But in two test categories the Pro display was not quite stellar: first, since 2012 all of the iPad and iPhone displays have had near perfect Log-Straight Intensity Scales (something that no other manufacturer has yet been able to match), but on the iPad Pro there is a significant Intensity Scale bump and irregularity at and below 45 percent signal as shown in this Figure, a surprising calibration issue for an Apple display (but still better than most competing Tablets).

 

Second, in Absolute Color Accuracy the iPad Pro just barely qualified for a Very Good Green rating, just 6 percent from the cutoff, where it has Average/Maximum Color Errors of 2.6 and 6.6 JNCD, much better than the iPad Air 2, but no where near as good as the iPad mini 4, as shown in this Figure. If better Absolute Color Accuracy is important, then for this screen size consider the Microsoft Surface Pro 4 with Average/Maximum Color Errors of 1.9 and 4.1 JNCD – tied with the iPad mini 4 for the most Color Accurate Tablet that we have ever tested.

 

The displays on the competing iPad Pro and Surface Pro 4 are both Very Good to Excellent in all test categories. The most significant performance differences are the iPad Pro’s much lower Screen Reflectance (2.6 versus 5.6 percent) and the Surface Pro 4’s much better Absolute Color Accuracy (listed above).

 

If you need a large Professional grade Tablet with Very Good to Excellent image quality and accuracy, the iPad Pro delivers a Top Tier professional display. See the Display Shoot-Out Comparison Table for all of the measurements and details.

 

Comparing Tablet Displays

You can directly compare all of the display performance measurements and results for many other Tablets by referring to our Mobile Display Technology Shoot-Out article series by using a Tabbed web browser on the Comparison Table for each article. The entries for all the articles are mostly identical with only minor formatting differences, so it is easy to make detailed side-by-side comparisons by simply clicking through the Tabs for each Tablet.

 

Below are links for the Comparison Tables for the Tablets mentioned in the article:

Apple iPad 2015 Lab Measurements Comparison Table

Microsoft Surface Pro 4 Lab Measurements Comparison Table

Microsoft Surface 3 Lab Measurements Comparison Table

Samsung OLED Tablet Lab Measurements Comparison Table

Apple iPad mini 3 Lab Measurements Comparison Table

 

The Next Generation of Displays  –  Better Performance in Ambient Light

Right now the iPads are the unrivaled record holders for display performance in ambient light as a result of their record low screen Reflectance of 2.0 to 2.6 percent, significantly lower than the 4.5 to 6.5 percent Reflectance currently found in all other current competing Tablets.

 

Apple has taken an important first step towards improving display performance in ambient light. But essentially all displays are still designed to work best in absolute darkness, but they all significantly degrade in even modest levels of ambient light. However, Microsoft has also taken an important initial step, with the Surface 3 providing its best Color Accuracy in typical indoor 300 lux ambient light rather than in absolute darkness like everybody else…

 

The best performing LCD and OLED displays are now delivering impressive sharpness, brightness, low reflectance, high color accuracy, accurate image contrast, and great viewing angles. So what comes next? Essentially all published display specifications and factory calibrations are based on performance in absolute darkness 0 lux, but mobile displays (and even TVs) are seldom viewed in the dark. Even low levels of ambient light significantly affect the image and picture quality. For example, the 100 percent sRGB Color Gamut specified by many manufacturers only applies at 0 lux. At 500 lux, which corresponds to typical indoor office lighting, the on-screen colors are washed out by the reflected ambient light, typically reducing the on-screen Color Gamut from 100 percent down to 80 percent, plus the image contrast is also significantly affected. And it gets worse as the ambient light levels increase.

 

So here is what needs to come next…

 

The most important improvements for both LCD and OLED displays will come from improving their image and picture quality and screen readability in real world ambient light, which washes out the screen images, resulting in reduced image contrast, color saturation, and color accuracy. The key will be in lowering screen Reflectance and then implementing Dynamic Color Management with automatic real-time modification of a larger Color Gamut and Intensity Scale based the measured Ambient Light level in order to have them compensate for the reflected light glare and image wash out from ambient light as discussed in our 2014 Innovative Displays and Display Technology and SID Display Technology Shoot-Out articles.

 

The higher the ambient light level, the larger the Color Gamut that the display needs in order to compensate for the loss of color saturation from the reflected ambient light. All LCDs will need Quantum Dots in order to implement the necessary large Color Gamuts.

 

The displays, technologies, and manufacturers that succeed in implementing this new real world high ambient light performance strategy will take the lead in the next generations of mobile displays… Follow DisplayMate on Twitter to learn about these developments and our upcoming display technology coverage.

 

 

DisplayMate Display Optimization Technology

All Tablet and Smartphone displays can be significantly improved using DisplayMate’s proprietary very advanced scientific analysis and mathematical display modeling and optimization of the display hardware, factory calibration, and driver parameters. We help manufacturers with expert display procurement, prototype development, testing displays to meet contract specifications, and production quality control so that they don’t make mistakes similar to those that are exposed in our public Display Technology Shoot-Out series for consumers. This article is a lite version of our advanced scientific analysis – before the benefits of our DisplayMate Display Optimization Technology, which can correct or improve all of these issues. If you are a display or product manufacturer and want to significantly improve display performance for a competitive advantage then Contact DisplayMate Technologies.

 

iPad mini 4

iPad Air 2

iPad Pro

 

Display Shoot-Out Comparison Table

Below we examine in-depth the LCD displays on the Apple iPad mini 4, the iPad Air 2, and iPad Pro based on objective Lab measurement data and criteria. For comparisons and additional background information refer to these comparable Tablet displays: Microsoft Surface Pro 4 Display Technology Shoot-Out, the Microsoft Surface 3 Display Technology Shoot-Out, and the Samsung OLED Tab S Display Technology Shoot-Out.

 

For comparisons with the other leading Tablet, Smartphone, and Smart Watch displays see our Mobile Display Technology Shoot-Out series.

 

Categories

 iPad mini 4

iPad Air 2

iPad Pro

Comments

Display Technology

  7.9 inch Diagonal

 IPS LCD

 

 

  9.7 inch Diagonal

IPS LCD

Photo Aligned LCD

 

  12.9 inch Diagonal

IPS LCD

Photo Aligned LCD

Metal Oxide TFT

The diagonal screen size.

Liquid Crystal Display

In Plane Switching

Screen Shape

  4:3 = 1.33

Aspect Ratio

  4:3 = 1.33

Aspect Ratio

  4:3 = 1.33

Aspect Ratio

The iPads have the same shape as 8.5x11 paper.

Screen Size

6.3 x 4.7 inches

7.8 x 5.8 inches

10.3 x 7.7 inches

Display Width and Height in inches.

Screen Area

29.6 Square Inches

45.1 Square Inches

80.3 Square Inches

A better measure of size than the diagonal length.

Relative Screen Area for mini 4

100 percent

153 percent

271 percent

Relative screen areas compared to the iPad mini 4.

Relative Screen Area for Air 2

66 percent

100 percent

178 percent

Relative screen areas compared to the iPad Air 2.

Relative Screen Area for Pro

37 percent

56 percent

100 percent

Relative screen areas compared to the iPad Pro.

Display Resolution

2048 x 1536 pixels

Full High Definition+

Very Good

2048 x 1536 pixels

Full High Definition+

Very Good

2732 x 2048 pixels

Full High Definition+

Very Good

Screen Pixel Resolution.

Total Number of Pixels

3.1 Mega Pixels

Very Good

3.1 Mega Pixels

Very Good

 5.6 Mega Pixels

Very Good

Total Number of Pixels.

Pixels Per Inch

326 PPI

Very Good

264 PPI

Very Good

264 PPI

Very Good

Sharpness depends on the viewing distance and PPI.

See this on the visual acuity for a true Retina Display

20/20 Vision Distance

where Pixels or Sub-Pixels

are Not Resolved

10.5 inches or more

with 20/20 Vision

13.0 inches or more

with 20/20 Vision

13.0 inches or more

with 20/20 Vision

For 20/20 Vision the minimum Viewing Distance

where the screen appears perfectly sharp to the eye.

Display Sharpness

at Typical Viewing Distances

 Display normally appears Perfectly Sharp

Typical 12 inches or more

 

Pixels are not Resolved with 20/20 Vision

Display normally appears

Perfectly Sharp

Typical 14 inches or more

 

Pixels are not Resolved with 20/20 Vision

Display normally appears

Perfectly Sharp

Typical 16 inches or more

 

Pixels are not Resolved with 20/20 Vision

The Typical Viewing Distances are:

 

12 inches or more for the iPad mini 4.

14 inches or more for the iPad Air 2.

16 inches or more for the iPad Pro.

Appears Perfectly Sharp

at Typical Viewing Distances

 Yes

 Yes

 Yes

Typical Viewing Distances are listed above.

Photo Viewer Color Depth

 Full 24-bit Color

No Dithering Visible

256 Intensity Levels

 Full 24-bit Color

No Dithering Visible

256 Intensity Levels

 Full 24-bit Color

No Dithering Visible

256 Intensity Levels

Many Android Tablets still have some

form of 16-bit color depth in the Gallery Viewer.

The iPads do not have this issue.

 

Overall Assessments

This section summarizes the results for all of the extensive Lab Measurements and Viewing Tests performed on the display

See  Screen ReflectionsBrightness and ContrastColors and IntensitiesViewing AnglesLCD SpectraDisplay Power.

 

Categories

iPad mini 4

iPad Air 2

iPad Pro

Comments

Viewing Tests

in Subdued Ambient Lighting

 

 Excellent Images

Photos and Videos

have Excellent Color

and Accurate Contrast

Very Good Images

Photos and Videos

have Very Good Color

and Accurate Contrast

Very Good Images

Photos and Videos

have Very Good Color

and Accurate Contrast

The Viewing Tests examine the accuracy of

photographic images by comparing the displays

to an calibrated studio monitor and HDTV.

 

Variation with Viewing Angle

Colors and Brightness

 

See Viewing Angles

 

 

 

Small Color Shifts

with Viewing Angle

Very Good

 

Large Brightness Shift

with Viewing Angle

Typical for all LCDs

Small Color Shifts

with Viewing Angle

Very Good

 

Large Brightness Shift

with Viewing Angle

Typical for all LCDs

Small Color Shifts

with Viewing Angle

Very Good

 

Large Brightness Shift

with Viewing Angle

Typical for all LCDs

The iPad displays all have a relatively large

decrease in Brightness with Viewing Angle and

relatively small Color Shifts with Viewing Angle.

 

See the Viewing Angles section for details.

 

 

Overall Display Assessment

Lab Tests and Measurements

Excellent LCD Display

Very Good LCD Display

Excellent LCD Display

The iPad displays all performed

very well in the Lab Tests and Measurements.

 

Color Gamut

101 percent

sRGB / Rec.709

Best

107 percent

sRGB / Rec.709

 

105 percent

sRGB / Rec.709

 

sRGB / Rec.709 is the color standard for most

content and needed for accurate color reproduction.

Absolute Color Accuracy

Measured over Entire Gamut

 

See Figure 2 and Colors

 

Excellent Color Accuracy

Small Color Errors

   Average 1.9 JNCD

Maximum 4.2 JNCD

Best

Good Color Accuracy

Medium Color Errors

   Average 3.9 JNCD

Maximum 8.8 JNCD

 

Very Good Color Accuracy

Small Color Errors

   Average 2.6 JNCD

Maximum 6.6 JNCD

 

Absolute Color Accuracy is measured with a

Spectroradiometer for 21 Reference Colors

uniformly distributed within the entire Color Gamut.

 

See Figure 2 and Colors and Intensities for details.

Image Contrast Accuracy

Logarithmic Intensity Scale

 

See Figure 3 and Contrast

 

Excellent

Image Contrast Accuracy

Close to Perfect

Gamma 2.22

Best

Excellent

Image Contrast Accuracy

Close to Standard

Gamma 2.25

 

Very Good

Image Contrast Accuracy

Slightly Irregular

Average Gamma 2.13

 

The Image Contrast Accuracy is determined by

measuring the Log Intensity Scale and Gamma.

 

See Figure 3 and Brightness and Contrast for details.

 

True Contrast Ratio at 0 lux

Relevant for Low Ambient Light

 

957

Very Good for Mobile

 

1,064

Very Good for Mobile

 

1,631

Very Good for Mobile

Best

Only relevant for Low Ambient Light,

which is seldom the case for mobile devices.

 

Performance in Ambient Light

Display Brightness

 

Screen Reflectance

 

Contrast Rating

for High Ambient Light

 

See Brightness and Contrast

See Screen Reflections

High Display Brightness

450 nits

 

Record Low Reflectance

2.0 percent

Best

 

Record Contrast Rating

for High Ambient Light

225  Excellent

High Display Brightness

415 nits

 

Very Low Reflectance

2.5 percent

 

 

Very High Contrast Rating

for High Ambient Light

166  Excellent

High Display Brightness

424 nits

 

Very Low Reflectance

2.6 percent

 

 

Very High Contrast Rating

for High Ambient Light

163  Excellent

Tablets are seldom used in the dark.

Screen Brightness and Reflectance determine

the Contrast Rating for High Ambient Light.

 

See the Brightness and Contrast section for details.

See the Screen Reflections section for details.

 

 

 

 

Overall Display Calibration

Image and Picture Quality

Lab Tests and Viewing Tests

 

 

Excellent Calibration

Best

But White Point is

Slightly Too Blue

7,109 K

Very Good Calibration

 

But White Point is

Somewhat Too Blue

7,355 K

Very Good Calibration

 

But White Point is

Slightly Too Blue

7,164 K

All of the iPads have a slightly Bluish White.

Some people prefer that but it does affect all of

the Low Saturation Colors.

 

 

 

Overall Display Grade

Overall Assessment

 

 

 

All 2015 iPads have Recommended Top Tier Displays

The iPads all have uniformly Very Good to Excellent

Top Tier Display Performance.

 

All have an Innovative Anti-Reflection screen coating.

 

Excellent Display  A

Small Size Tablet

 

Innovative Anti-Reflection

Very Good Display  A–

Medium Size Tablet

 

Innovative Anti-Reflection

Very Good Display  A–

Large Size Tablet

 

Innovative Anti-Reflection

 

iPad mini 4

iPad Air 2

iPad Pro

Comments

 

Screen Reflections

All display screens are mirrors good enough to use for personal grooming – but that is actually a very bad feature…

We measured the light reflected from all directions and also direct mirror (specular) reflections, which are much more

distracting and cause more eye strain. Many Tablets still have greater than 5 percent reflections that make the

screen much harder to read even in moderate ambient light levels, requiring ever higher brightness settings that waste

precious battery power. Hopefully, manufacturers will reduce the Reflections with anti-reflection coatings and also

the Mirror Reflections matte or haze surface finishes.

 

Our Lab Measurements include Average Reflectance for Ambient Light from All Directions and for Mirror Reflections.

 

All the iPads have a bonded Cover Glass without an Air Gap.

All the iPads have a very innovative Anti-Reflection screen coating that produces the

Lowest Reflectance that we have ever measured for a Tablet or Smartphone.

 

Categories

 iPad mini 4

 iPad Air 2

 iPad Pro

Comments

Average Screen Reflection

Light From All Directions

 2.0  percent

Ambient Light Reflections

Record Low

Outstanding

 2.5  percent

Ambient Light Reflections

Very Low

Outstanding

 2.6  percent

Ambient Light Reflections

Very Low

Outstanding

Measured using an Integrating Hemisphere and

a Spectroradiometer. The best value we have

ever measured for a Tablet is 2.0 percent.

Relative Brightness of the

Reflected Ambient Light

Lowest Reflected Glare

25 percent more Light Glare

30 percent more Light Glare

Relative Brightness of the Reflected Ambient Light

Expressed as a percentage of the lowest amount.

Mirror Reflections

Percentage of Light Reflected

 2.6  percent

for Mirror Reflections

Record Low

Outstanding

2.9  percent

for Mirror Reflections

Very Low

Outstanding

2.8  percent

for Mirror Reflections

Very Low

Outstanding

These are the most annoying types of Reflections.

Measured using a Spectroradiometer and a narrow

collimated pencil beam of light reflected off the screen.

Cover Glass with Display

Bonded Cover Glass

Laminated Display

Anti-Reflection Coating

Bonded Cover Glass

Laminated Display

Anti-Reflection Coating

Bonded Cover Glass

Laminated Display

Anti-Reflection Coating

The Cover Glass and other optical layers above the

Display have a significant impact on the Reflectance.

 

Brightness and Contrast

The Contrast Ratio is the specification that gets the most attention, but it only applies for low ambient light, which is seldom

the case for mobile displays. Much more important is the Contrast Rating, which indicates how easy it is to read the screen

under high ambient lighting and depends on both the Maximum Brightness and the Screen Reflectance. The larger the better.

The display’s actual Contrast Ratio changes with  the Ambient Light lux level and is proportional to the Contrast Rating.

 

The iPad mini 4 has the Highest Contrast Rating for High Ambient Light that we have ever measured as the result of its Low Reflectance.

The display’s actual Contrast Ratio changes with the Ambient Light lux level and is proportional to the Contrast Rating.

 

Categories

iPad mini 4

iPad Air 2

iPad Pro

Comments

Measured Full Brightness

100% Full Screen White

Brightness 450 cd/m2

Very Good

Brightness 415 cd/m2

Very Good

Brightness 424 cd/m2

Very Good

This is the Brightness for a screen that is entirely

all white with 100% Average Picture Level.

Measured Peak Brightness

1% Full Screen White

Brightness 450 cd/m2

Very Good

Brightness 415 cd/m2

Very Good

Brightness 424 cd/m2

Very Good

This is the Peak Brightness for a screen that

has only a tiny 1% Average Picture Level.

Measured Auto Brightness

in High Ambient Light

with Automatic Brightness On

Max Auto Brightness

450 cd/m2

Very Good

Max Auto Brightness

415 cd/m2

Very Good

Max Auto Brightness

424 cd/m2

Very Good

Some displays have a higher Maximum Brightness

in Automatic Brightness Mode.

 

Low Ambient Light

Lowest Peak Brightness

Brightness Slider to Minimum

5 cd/m2

Very Good for Low Light

5 cd/m2

Very Good for Low Light

4 cd/m2

Very Good for Low Light

The Lowest Brightness with the Slider set to Minimum. This is useful for working in very dark environments.

True Black Brightness at 0 lux

at Maximum Brightness Setting

0.47 cd/m2

Very Good for Mobile

0.39 cd/m2

Very Good for Mobile

0.26 cd/m2

Very Good for Mobile

Black brightness is important for low ambient light,

which is seldom the case for mobile devices.

True Contrast Ratio at 0 lux

Relevant for Low Ambient Light

957

Very Good for Mobile

1,064

Very Good for Mobile

1,631

Very Good for Mobile

Only relevant for Low Ambient Light,

which is seldom the case for mobile devices.

 

High Ambient Light

Contrast Rating

for High Ambient Light

 

The Higher the Better

for Screen Readability

in High Ambient Light

225

Excellent

 

225

With Auto Brightness

Excellent

166

Excellent

 

166

With Auto Brightness

Excellent

163

Excellent

 

163

With Auto Brightness

Excellent

Depends on the Screen Reflectance and Brightness.

Defined: Maximum Brightness / Average Reflectance.

 

The display’s actual Contrast Ratio changes with

the Ambient Light lux level and is proportional to

the Contrast Rating.

Screen Readability

in High Ambient Light

Excellent  A

 

Excellent  A

With Auto Brightness

Excellent  A

 

Excellent  A

With Auto Brightness

Excellent  A

 

Excellent  A

With Auto Brightness

Indicates how easy it is to read the screen

under high ambient lighting. Depends on

both the Screen Reflectance and Brightness.

See High Ambient Light Screen Shots

 

Colors and Intensities

 

Figure 1

Color Gamuts

Click to Enlarge

 

Figure 2

Color Accuracy

Click to Enlarge

 

Figure 3

Intensity Scale

Click to Enlarge

 

The Color Gamut, Intensity Scale, and White Point determine the quality and accuracy of all displayed images and all

the image colors. Bigger is definitely Not Better because the display needs to match all the standards that were used

when the content was produced. For LCDs a wider Color Gamut reduces the power efficiency and the Intensity Scale

affects both image brightness and color mixture accuracy.

 

All of the iPads continue with a Slightly Bluish White Point. The White Point Accuracy is more critical than for other

colors because it affects all of the low saturation colors and white is more noticeable because it often fills the screen.

 

The Bluish White Point results in somewhat higher Absolute Color Errors over the entire Color Gamut.

As a result the largest Color Error is often for Magenta because it is the furthest away from the White Point.

 

Categories

iPad mini 4

iPad Air 2

iPad Pro

Comments

Color of White

Color Temperature in degrees

See Figure 2 for JNCD

 

Measured in the dark at 0 lux

For the Plotted White Points

See Figure 1

7,109 K

1.6 JNCD from D65 White

 

White is Slightly Bluish

 

See Figure 1

 

See Figure 2 for JNCD

7,355 K

2.4 JNCD from D65 White

 

White is Somewhat Bluish

 

See Figure 1

 

See Figure 2 for JNCD

7,164 K

1.8 JNCD from D65 White

 

White is Slightly Bluish

 

See Figure 1

 

See Figure 2 for JNCD

D65 with 6,500 K is the standard color of White

for most Consumer Content and needed for

accurate color reproduction of all images.

 

JNCD is a Just Noticeable Color Difference.

White Point Accuracy is more critical than other Colors.

 

See Figure 2 for the definition of JNCD.

Color Gamut

Measured in the dark at 0 lux

 

See Figure 1

101 percent

sRGB / Rec.709

 

Very Close to Standard

 

See Figure 1

107 percent

sRGB / Rec.709

 

Fairly Close to Standard

 

See Figure 1

105 percent

sRGB / Rec.709

 

Fairly Close to Standard

 

See Figure 1

sRGB / Rec.709 is the color standard for most

content and needed for accurate color reproduction.

 

 

Color Accuracy

Absolute Color Accuracy

Average Color Error at 0 lux

 

For 21 Reference Colors

Just Noticeable Color Difference

See Figure 2

 Average Color Error

From sRGB / Rec.709

Δ(u’v’) = 0.0077

 1.9 JNCD

 

Excellent Accuracy

 

See Figure 2

 Average Color Error

From sRGB / Rec.709

Δ(u’v’) = 0.0155

 3.9 JNCD

 

Good Accuracy

 

See Figure 2

 Average Color Error

From sRGB / Rec.709

Δ(u’v’) = 0.0103

 2.6 JNCD

 

Very Good Accuracy

 

See Figure 2

JNCD is a Just Noticeable Color Difference.

 

See Figure 2 for the definition of JNCD and for

Accuracy Plots showing the measured Color Errors.

 

Average Errors below 3.5 JNCD are Very Good.

Average Errors 3.5 to 7.0 JNCD are Good.

Average Errors above 7.0 JNCD are Poor.

Absolute Color Accuracy

Largest Color Error at 0 lux

 

For 21 Reference Colors

Just Noticeable Color Difference

See Figure 2

Largest Color Shift

From sRGB / Rec.709

Δ(u’v’) = 0.0167

4.2 JNCD for Magenta

 

Very Good Accuracy

 

See Figure 2

Largest Color Error

From sRGB / Rec.709

Δ(u’v’) = 0.0350

8.8 JNCD for Magenta

 

Good Accuracy

 

See Figure 2

Largest Color Error

From sRGB / Rec.709

Δ(u’v’) = 0.0263

6.6 JNCD for Blue

 

Very Good Accuracy

 

See Figure 2

JNCD is a Just Noticeable Color Difference.

 

See Figure 2 for the definition of JNCD and for

Accuracy Plots showing the measured Color Errors.

 

Largest Errors below   7.0 JNCD are Very Good.

Largest Errors 7.0 to 14.0 JNCD are Good.

Largest Errors above 14.0 JNCD are Poor.

This is twice the limit for the Average Error.

 

Intensity Scale

Dynamic Brightness

Luminance Decrease with

Average Picture Level APL

0 percent Decrease

Excellent

0 percent Decrease

Excellent

0 percent Decrease

Excellent

This is the percent Brightness decrease with APL

Average Picture Level. Ideally should be 0 percent.

Logarithmic Intensity Scale

and Image Contrast

 

See Figure 3

Very Smooth and Straight

Excellent Image Contrast

 

See Figure 3

Very Smooth and Straight

Excellent Image Contrast

 

See Figure 3

Slightly Irregular

Very Good Image Contrast

 

See Figure 3

The Intensity Scale controls image contrast needed

for accurate Image Contrast and Color reproduction.

See Figure 3

Gamma for the Intensity Scale

Larger has more Image Contrast

 

See Figure 3

2.22

Excellent

Close to Perfect

 2.25

Excellent

Very Close to Standard

 Average 2.13

Very Good

But Slightly Too Low

Gamma is the log slope of the Intensity Scale.

Gamma of 2.20 is the standard and needed for

accurate Image Contrast and Color reproduction.

See Figure 3

Image Contrast Accuracy

Excellent

Excellent

Very Good

See Figure 3

 

Viewing Angles

The variation of Brightness, Contrast, and Color with Viewing Angle is especially important for Tablets because

of their larger screen and multiple viewers. The typical manufacturer 176+ degree specification for LCD Viewing Angle

is nonsense because that is where the Contrast Ratio falls to a miniscule 10. For most LCDs there are substantial

degradations at less than ±30 degrees, which is not an atypical Viewing Angle for Tablets and Smartphones.

 

Note that the Viewing Angle performance is also very important for a single viewer because the Viewing Angle can vary

significantly based on how the Tablet is held. The Viewing Angle can be very large if resting on a table or desk.

 

Categories

iPad mini 4

iPad Air 2

iPad Pro

Comments

Brightness Decrease

at a 30 degree Viewing Angle

–58 percent Portrait

     –59 percent Landscape

Very Large Decrease

Typical for all LCDs

    –62 percent Portrait

  –58 percent Landscape

Very Large Decrease

Typical for all LCDs

      –56 percent Portrait

    –56 percent Landscape

Very Large Decrease

Typical for all LCDs

Most screens become less bright when tilted.

 

LCD decrease is generally greater than 50 percent.

Contrast Ratio at 0 lux

at a 30 degree Viewing Angle

   573 Portrait

        414 Landscape

 Very Good for Mobile

    650 Portrait

         500 Landscape

Very Good for Mobile

  1,015 Portrait

          974 Landscape

Very Good for Mobile

A measure of screen readability when the screen

is tilted under low ambient lighting.

White Point Color Shift

at a 30 degree Viewing Angle

 Small Color Shift

Δ(u’v’) = 0.0076

 1.9 JNCD Excellent

 Small Color Shift

Δ(u’v’) = 0.0033

0.8 JNCD Excellent

 Small Color Shift

Δ(u’v’) = 0.0075

1.9 JNCD Excellent

JNCD is a Just Noticeable Color Difference.

See Figure 2 for the definition of JNCD.

Same Rating Scale as Absolute Color Accuracy.

Primary Color Shifts

Largest Color Shift for R,G,B

at a 30 degree Viewing Angle

Small Color Shift

Largest Δ(u’v’) = 0.0090

 for Blue

 2.2 JNCD Very Good

Small Color Shift

Largest Δ(u’v’) = 0.0053

 for Blue

 1.3 JNCD Excellent

Small Color Shift

Largest Δ(u’v’) = 0.0038

 for Green

 1.0 JNCD Excellent

JNCD is a Just Noticeable Color Difference.

See Figure 2 for the definition of JNCD.

Same Rating Scale as Absolute Color Accuracy.

Color Shifts for Color Mixtures

at a 30 degree Viewing Angle

Reference Brown (255, 128, 0)

 Small Color Shift

Δ(u’v’) = 0.0065

1.6 JNCD Excellent

 Small Color Shift

Δ(u’v’) = 0.0097

2.4 JNCD Very Good

 Small Color Shift

Δ(u’v’) = 0.0060

1.5 JNCD Excellent

JNCD is a Just Noticeable Color Difference.

Color Shifts for non-IPS LCDs are about 10 JNCD.

 

Reference Brown is a good indicator of color shifts

with angle because of unequal drive levels and

roughly equal luminance contributions from Red

and Green. See Figure 2 for the definition of JNCD.

 

 

 

Figure 4

Display Spectra

Click to Enlarge

 

 

Display Power Consumption

The display power was measured using a Linear Regression between Luminance and AC Power with a fully charged battery.

 

Below we compare the Relative Display Power Efficiencies of the Tablets compared to the iPad Air 2.

 

Since the displays all have different screen sizes and maximum brightness, the values are also scaled to the

same screen brightness (Luminance) and same screen area in order to compare their Relative Power Efficiencies.

 

As shown below, the Display Power Efficiencies for the iPad mini 4 and iPad Pro are 22% to 33% higher than the iPad Air 2.

 

The Microsoft Surface Pro 4 is even more efficient: it has 27 percent higher Relative Power Efficiency than the iPad Pro,

with just 3.0 watts when scaled to the same values as the iPad Air 2 below.

 

Both the iPad Pro and Surface Pro 4 have Metal Oxide Backplanes, which increases their light throughput and further

improves their Power Efficiency.

 

Categories

iPad mini 4

iPad Air 2

iPad Pro

Comments

Maximum Display Power

Full White Screen

at Maximum Brightness

 

3.0 watts

 

 450 cd/m2

29.6 inch2 Screen Area

 5.1 watts

 

415 cd/m2

45.1 inch2 Screen Area

 7.0 watts

 

424 cd/m2

80.3 inch2 Screen Area

This measures the display power for a screen that

is entirely at Peak White for Maximum Brightness.

 

 

Relative Power Efficiency

Compared to the iPad Air 2

Same Luminance 415 cd/m2

Same 45.1 inch screen area

  Relative Power 82%

Relative Efficiency 122%

 

4.2 watts

Relative Power 100%

Relative Efficiency 100%

 

5.1 watts

Relative Power 75%

Relative Efficiency 133%

 

3.8 watts

This compares the Maximum Power Efficiency

by scaling to the same screen brightness and

same screen area as the iPad Air 2.

 


 

About the Author

Dr. Raymond Soneira is President of DisplayMate Technologies Corporation of Amherst, New Hampshire, which produces display calibration, evaluation, and diagnostic products for consumers, technicians, and manufacturers. See www.displaymate.com. He is a research scientist with a career that spans physics, computer science, and television system design. Dr. Soneira obtained his Ph.D. in Theoretical Physics from Princeton University, spent 5 years as a Long-Term Member of the world famous Institute for Advanced Study in Princeton, another 5 years as a Principal Investigator in the Computer Systems Research Laboratory at AT&T Bell Laboratories, and has also designed, tested, and installed color television broadcast equipment for the CBS Television Network Engineering and Development Department. He has authored over 35 research articles in scientific journals in physics and computer science, including Scientific American. If you have any comments or questions about the article, you can contact him at dtso.info@displaymate.com.

 

DisplayMate Display Optimization Technology

All Tablet and Smartphone displays can be significantly improved using DisplayMate’s proprietary very advanced scientific analysis and mathematical display modeling and optimization of the display hardware, factory calibration, and driver parameters. We help manufacturers with expert display procurement, prototype development, testing displays to meet contract specifications, and production quality control so that they don’t make mistakes similar to those that are exposed in our public Display Technology Shoot-Out series for consumers. This article is a lite version of our advanced scientific analysis – before the benefits of our DisplayMate Display Optimization Technology, which can correct or improve all of these issues. If you are a display or product manufacturer and want to significantly improve display performance for a competitive advantage then Contact DisplayMate Technologies.

 

About DisplayMate Technologies

DisplayMate Technologies specializes in proprietary advanced scientific display calibration and mathematical display optimization to deliver unsurpassed objective performance, picture quality and accuracy for all types of displays including video and computer monitors, projectors, HDTVs, mobile displays such as Tablets and Smartphones, and all display technologies including LCD, LCD, 3D, LED, LCoS, Plasma, DLP and CRT. This article is a lite version of our intensive scientific analysis of Tablet and Smartphone mobile displays – before the benefits of our advanced mathematical DisplayMate Display Optimization Technology, which can correct or improve many of the display deficiencies. We offer DisplayMate display calibration software for consumers and advanced DisplayMate display diagnostic and calibration software for technicians and test labs.

 

For manufacturers we offer Consulting Services that include advanced Lab testing and evaluations, confidential Shoot-Outs with competing products, calibration and optimization for displays, cameras and their User Interface, plus on-site and factory visits. We help manufacturers with expert display procurement, prototype development, and production quality control so they don’t make mistakes similar to those that are exposed in our Display Technology Shoot-Out series. See our world renown Display Technology Shoot-Out public article series for an introduction and preview. DisplayMate’s advanced scientific optimizations can make lower cost panels look as good or better than more expensive higher performance displays. If you are a display or product manufacturer and want to turn your display into a spectacular one to surpass your competition then Contact DisplayMate Technologies to learn more.

 

 

Article Links:  Microsoft Surface Pro 4 Display Technology Shoot-Out

Article Links:  Microsoft Surface 3 Display Technology Shoot-Out

Article Links:  Samsung OLED Tab S Display Technology Shoot-Out

Article Links:  Apple iPad mini 3 Display Technology Shoot-Out

 

Article Links:  Mobile Display Shoot-Out Article Series Overview and Home Page

Article Links:  Display Technology Shoot-Out Article Series Overview and Home Page

 

 

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