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Flagship Smartphone Display Technology Shoot-Out

Apple iPhone 5  –  Samsung Galaxy S III  –  Apple iPhone 4

 

Dr. Raymond M. Soneira

President, DisplayMate Technologies Corporation

 

Copyright © 1990-2012 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

 

 

Apple iPhone 5

Samsung Galaxy S III

 

Introduction

The iPhone 5 has been the most anticipated mobile device of 2012 together with its cousin the iPad Mini, which we expect to be seeing shortly. Apple has made displays their most prominent marketing feature because it determines the quality of the visual experience for everything on a Smartphone or Tablet – including Apps, web content, photos, videos, and its camera. The Retina Displays on the iPhone 4 and the new iPad were significant advancements – not just in sharpness but in picture quality and color accuracy, which is what provides the display’s real Wow factor.

 

So how good is the display on the iPhone 5? There has been an incredible increase in competition since the introduction of the iPhone 4 in 2010: displays have gotten a lot bigger (possibly too big), more manufacturers are using similar high-end IPS LCDs like Apple, and many Smartphones are using the latest OLED displays manufactured by Samsung – with the Samsung Galaxy S III as the premier Flagship product.

 

First we’ll compare the display on the iPhone 5 to the iPhone 4 to see if it is indeed much better, which could be an important factor for those considering whether to upgrade. Then we’ll compare the iPhone 5 to its primary competitor, the Samsung Galaxy S III, and we’ll also see how well it compares to the outstanding display on the new iPad.

 

The Shoot-Out

To compare the performance of the Apple iPhone 5 and Samsung Galaxy S III we ran our in-depth series of Mobile Display Technology Shoot-Out tests on them. We also included the iPhone 4 in order to determine how the display on the iPhone 5 has been improved. We take display quality very seriously and provide in-depth objective analysis side-by-side comparisons based on detailed laboratory measurements and extensive viewing tests with both test patterns and test images. To see how far Smartphones have progressed in just two 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 Lab measurements and extensive side-by-side visual comparisons using test photos, test images and test patterns that are presented in later sections. The Comparison Table in the following section summarizes the lab measurements in the following categories:  Screen ReflectionsBrightness and ContrastColors and IntensitiesViewing AnglesDisplay Power ConsumptionRunning Time on Battery. You can also skip the Highlights and go directly to the Conclusions.

 

Comparing the Displays on the iPhone 4 and iPhone 5:

The display on the iPhone 5 is a significant improvement over the display on the iPhone 4. Apple has uncharacteristically understated how much better the display is on the iPhone 5 – something that could be an important factor for those considering whether to upgrade. In every category that we measure (except Brightness Decrease with Viewing Angle), the performance of the iPhone 5 display has improved over the iPhone 4, sometimes by a bit and sometimes by a lot. Everyone knows about the 18 percent increase in screen area, but here are 3 major display enhancements on the iPhone 5 that we will discuss in detail below:

 

Screen Reflectance on the iPhone 5 has decreased substantially – the iPhone 4 has 52 percent brighter reflections than the iPhone 5. This means you won’t be distracted as much by reflections that appear on the screen. The iPhone 5 has among the lowest Reflectance values we have ever measured on a Mobile device.

 

The iPhone 5 has the highest Contrast Rating for High Ambient Light for any Mobile device we have ever tested, and it’s 57 percent higher than the iPhone 4. This means screen readability in bright ambient lighting has improved substantially – both the image colors and contrast won’t appear as washed out outdoors as on other Smartphones, including the iPhone 4.

 

The color quality and color accuracy have improved substantially. The iPhone 5 received a Color Gamut and Factory Display Calibration upgrade similar to the new iPad. While it’s not quite as accurate as the Excellent calibration on the new iPad, it is still Very Good and probably more accurate than any consumer display you own (including your HDTV), unless you have a new iPad.

 

The iPhone 5 Display:

It’s still a Retina Display with 326 Pixels Per Inch PPI and with a Resolution of 1136x640 pixels. We were hoping for 1280x720, which is Standard High Definition HD, but presumably that will be for the iPhone 6. That’s not a disappointment, just a wish list… Based on our extensive Lab measurements the iPhone 5 has a true state-of-the-art display – it’s not perfect and there is plenty of room for improvements (and competitors) but it’s the best Smartphone display we have tested to date.

 

We’ll examine the iPhone 5 display in detail below, but here are the Highlights: it is the Brightest Smartphone we have tested in the Shoot-Out series, it has one of the lowest screen Reflectance values we have ever measured, it has the highest Contrast Rating for High Ambient Light for any Mobile device we have ever tested, and it’s Color Gamut and Factory Calibration are second only to the new iPad. What are the downsides? The White Point is still somewhat too blue like most Smartphones, and at Maximum Brightness it has a shorter Running Time than the iPhone 4, which is not surprising since it has a larger screen and a larger Color Gamut but roughly the same capacity battery.

 

The Galaxy S III Display:

Samsung also features their displays when marketing Smartphones, but they have taken a very different approach – they are using Samsung’s own OLED displays, a new and rapidly evolving display technology that is very different from LCDs, with its own particular set of advantages and disadvantages. It’s a new technology that attracts early adopters, but it has not yet been refined to the same degree as LCDs, which have been mainstream for over 20 years. It’s clear that OLEDs in the near future will do to LCDs what LCDs did to CRTs, but we are not there yet… So OLEDs have a number of rough spots that show up clearly in our objective Lab testing.

 

We’ll examine the OLED Galaxy S III display in detail below, but here are the Highlights: the Brightness is about half of the iPhone 5 due to power limits from the lower power efficiency of OLEDs and concerns regarding premature OLED aging. The Color Gamut is not only much larger than the Standard Color Gamut, which leads to distorted and exaggerated colors, but the Color Gamut is quite lopsided, with Green being a lot more saturated than Red or Blue, which adds a Green color caste to many images. Samsung has not bothered to correct or calibrate their display colors to bring them into closer agreement with the Standard sRGB / Rec.709 Color Gamut, so many images appear over saturated and gaudy. Running Time on battery is less than the iPhone 5 due to the lower power efficiency of OLEDs, even given that the Galaxy S III has a much larger battery capacity and much lower Brightness.

 

The Galaxy S III has a PenTile OLED display, which has only half of the number of Red and Blue sub-pixels as in standard RGB displays, like those on the iPhones. The eye’s resolution for color image detail is lower, so this works well for photographic and video image content, but NOT for computer generated colored text and fine graphics because it produces visible pixelation, moiré, and other very visible artifacts, so a PenTile display is not as sharp as its pixel Resolution and PPI would indicate. PenTile technology does have advantages in manufacturing, aging and cost. For a more detailed analysis see our Samsung Galaxy S OLED Display Technology Shoot-Out.

 

Color Gamut and Color Accuracy:

While the display Pixels Per Inch PPI and pixel Resolution seem to get most of the attention, it is the display’s Color Gamut together with the Factory Display Calibration that play the most important role in determining the Wow factor and true picture quality and color accuracy of a display. The Color Gamut is the range of colors that a display can produce. If you want to see accurate colors in photos, videos, and all standard consumer content the display needs to closely match the Standard Color Gamut that was used to produce the content, which is called sRGB / Rec.709. A display with a larger Color Gamut cannot show colors that are not in the original content - it just exaggerates and distorts the colors. Most of the recent generation LCD Smartphones have Color Gamuts around 60 percent of the Standard Gamut, which produces somewhat subdued colors. The iPhone 4 has a 64 percent Color Gamut, but the new iPad pulled way ahead and has a virtually perfect 99 percent of the Standard Color Gamut. The iPhone 5 has an almost identical Color Gamut to the new iPad and the Viewing Tests confirm its excellent color accuracy.

 

While Apple has clearly made a big effort in getting the Color Gamut very accurate for the new iPad and iPhone 5, Samsung has not bothered to calibrate the Color Gamut on any of its OLED displays, so they are wildly inaccurate and produce inaccurate and over saturated colors. The Color Gamut is not only much larger than the Standard Color Gamut, which leads to distorted and exaggerated colors, but its Color Gamut is quite lopsided, with Green being a lot more saturated than either Red or Blue, which adds a Green color caste to many images. The Viewing Tests bear this out. Compare the Color Gamuts in this Figure and below.

 

Viewing Tests:

Using our extensive library of challenging test and calibration photos, we compared the Smartphones to a calibrated professional studio monitor and to the new iPad, which has a virtually perfect Factory Calibration and Color Gamut. As expected from the Lab measurements, the iPhone 5 produced beautiful picture quality, much better than the iPhone 4, which has a much smaller Color Gamut, and comparable to the new iPad, but with slightly greater image contrast and color saturation due to its steeper Intensity Scale and larger Gamma. See these Color Gamut and Intensity Scale figures for details and explanations.

 

But what really impressed me was that all of the photos and their colors on both the iPhone 5 and new iPad appeared virtually identical. You never see that in any consumer product unless it has been professionally calibrated (with varying degrees of success). So if you switch devices or share photos and content with friends and family you know that they will be seeing exactly what you are seeing…

 

The Color Gamut of the Galaxy S III is significantly larger than the Standard Color Gamut so it produces over saturated colors that can appear comic book like and gaudy in some instances. Photos appear with way too much color. It’s similar to turning the Color Control way up on your HDTV. If the images have relatively low color saturation to begin with then they look more vibrant but not objectionable. However, if the images have vibrant colors to begin with, like a fire engine, then the images can be visually painful to look at. When compared side-by-side to the accurately calibrated iPhone 5 and new iPad, the Galaxy S III looked gaudy.

 

Screen Reflectance and High Ambient Lighting:

The screens on almost all Smartphones and Tablets are mirrors good enough to use for personal grooming. Even in moderate ambient lighting the image contrast and colors can noticeably degrade from ambient light reflected by the screen, including objects like your face and any bright lighting behind you. So low Reflectance is very important in determining real world picture quality. This article has screen shots of how images degrade in bright ambient lighting. The iPhone 5 has the highest Contrast Rating for High Ambient Light for any Mobile device we have ever tested. Because of its low screen Brightness the Galaxy S III has a much poorer Contrast Rating and screen visibility in bright ambient light.

 

The Rumored Apple Television?

If you have ever walked into Walmart or Best Buy and compared the multitude of HDTVs you know that every single TV produces a different looking picture (and they are all inaccurate). So why should Apple introduce its own Apple Television with an actual TV screen as opposed to just relying on an Apple TV streaming box connected to any TV? Because existing TVs are poorly calibrated and produce inaccurate and inconsistent colors and images that will be poor matches to Apple's own accurately calibrated iPhones and iPads. The best solution will be for Apple to manufacture its own Television with the same accurate calibration as its other displays. Consumers will love the fact that everything including their personal photos, TV shows, movies, and videos will all look exactly the same on all Apple devices.

 

 

Conclusions:   An Impressive iPhone 5 Display…

Smartphone displays are continuing their rapid evolution in performance. Apple has again taken the lead in methodical refinements and factory calibration that are necessary to produce accurate very high picture quality. Based on our extensive Lab measurements the iPhone 5 has a true state-of-the-art accurate display – it’s not perfect and there is plenty of room for improvements (and competitors) but it is the best Smartphone display we have seen to date based on extensive Lab measurements and viewing tests. In particular it is a significant improvement over the display in the iPhone 4 with much lower screen Reflections, much higher image contrast and screen readability in high ambient lighting (the highest we have ever measured), and a significantly improved and accurate Color Gamut and Factory Calibration that delivers very accurate colors and very good picture quality. While it’s not quite as accurate as the new iPad, it is still probably more accurate than any consumer display you own (including your HDTV), unless you have a new iPad.

 

The display on the Samsung Galaxy S III uses OLED technology. It’s a new technology that has not yet been refined to the same degree as LCDs, particularly the IPS LCDs on the iPhones, so it doesn’t objectively test or perform as well as the iPhone 5. But OLEDs have been evolving and improving very rapidly as shown in our OLED Display Technology Shoot-Out so it has a very promising future. Here are the biggest issues we found in our extensive Lab measurements and viewing tests of the Galaxy S III: the Brightness is about half of the iPhone 5 due to power constraints resulting from the lower OLED power efficiency and concerns regarding premature OLED aging. As a result the image contrast and screen readability in high ambient lighting is much poorer than the iPhone 5. The Color Gamut is not only much larger than the Standard Color Gamut, which leads to distorted and exaggerated colors, but the Gamut is quite lopsided, with Green being a lot more saturated than either Red or Blue, which adds a Green color caste to many images. And for some reason Samsung has not bothered to calibrate the Color Gamut on any of its OLED displays, so they are wildly inaccurate and produce inaccurate and over saturated colors.

 

Suggestions for Apple: Keep up the good work in improving picture quality through accurate display calibration! To produce a better display please don’t make the White Point Color Temperature so blue – it’s the only significant calibration flaw and it gives some images a bit of a cold bluish caste. The Intensity Scale on the iPhone 5 should be changed to match the excellent calibration of the new iPad. Finally, consumers have varying tastes in color saturation and image contrast – why not give displays the equivalent of an audio equalizer to let everyone adjust the display to their own personal visual preferences?

 

Suggestions for Samsung: Keep up the good work in improving OLED displays! To produce a better OLED Smartphone, use a smaller size display (that uses less power), add a bigger battery to increase the screen Brightness and running time on battery, and most all – please calibrate the display so that its Color Gamut matches the Standard Color Gamut and the display delivers accurate rather than distorted, exaggerated, and gaudy colors!

 

Suggestions for all manufacturers: There is still plenty of Room for Improvement. See the new iPad Shoot-Out Conclusion for a discussion of the many improvements that are needed for the next generation of Smartphone and Tablet displays.

 

 

DisplayMate Display Optimization Technology

All Smartphone and Tablets displays can be significantly improved using DisplayMate’s 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 and quality control so they don’t make mistakes similar to those that are exposed in our Display Technology Shoot-Out series. We can also improve the performance of any specified set of display parameters. This article is a lite version of our intensive 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.

 

Apple iPhone 5

Samsung Galaxy S III

 

Display Shoot-Out Comparison Table

Below we compare the displays on the Apple iPhone 5 and Samsung Galaxy S III together with the iPhone 4 based on objective measurement data and criteria. Note that the tested Smartphones were purchased independently by DisplayMate Technologies through standard retail channels.

 

For additional background and information see the iPad Retina Display Technology Shoot-Out article that compares and analyzes the new iPad, the iPad 2, and iPhone 4, and the Samsung Galaxy S OLED Display Technology Shoot-Out that compares and analyzes the evolution of the OLED displays on the Galaxy S I, II, and III and compares and analyzes PenTile displays compared to standard RGB displays.

 

Categories

Apple

iPhone 4

Apple

iPhone 5

Samsung

Galaxy S III

Comments

Display Technology

3.5 inch

IPS LCD

4.0 inch

IPS LCD

4.8 inch

PenTile OLED

Liquid Crystal Display with In Plane Switching

Organic Light Emitting Diode

Screen Shape

3:2 = 1.50

Aspect Ratio

16:9 = 1.78

Aspect Ratio

16:9 = 1.78

Aspect Ratio

The iPhone 5 and Galaxy S III screens have the same

shape as widescreen HDTV video content.

Screen Area

5.7 Square Inches

6.7 Square Inches

9.8 Square Inches

A better measure of size than the diagonal length.

Relative Screen Area

85 percent

100 percent

146 percent

Screen Area relative to the iPhone 5.

Display Resolution

960 x 640 pixels

1136 x 640 pixels

1280 x 720 pixels

The more Pixels and Sub-Pixels the better.

Pixels Per Inch

326 PPI

Excellent

326 PPI

Excellent

PenTile 306 PPI

Very Good

At 12 inches from the screen 20/20 vision is 286 ppi.

See this on the visual acuity for a true Retina Display

Sub-Pixels Per Inch

   Red 326 SPPI

Green 326 SPPI

  Blue 326 SPPI

   Red 326 SPPI

Green 326 SPPI

  Blue 326 SPPI

   Red 216 SPPI

Green 306 SPPI

  Blue 216 SPPI

PenTile displays have only half the number of Red

and Blue Sub-Pixels as standard RGB displays.

For our analysis of PenTile see the OLED Shoot-Out.

Total Number of Sub-Pixels

   Red 614 KSP

Green 614 KSP

  Blue 614 KSP

   Red 727 KSP

Green 727 KSP

  Blue 727 KSP

   Red 462 KSP

Green 922 KSP

  Blue 462 KSP

Number of Kilo Sub-Pixels KSP for Red, Green, Blue.

PenTile displays have only half the number of Red

and Blue Sub-Pixels as standard RGB displays.

20/20 Vision Retina Display

down to this Viewing Distance

20/20 “Retina Display”

to 10.5 inches Viewing

20/20 “Retina Display”

to 10.5 inches Viewing

20/20 “Retina Display”

to 11.2 inches Viewing

Red / Blue to 15.9 inches

For 20/20 Vision the minimum Viewing Distance

where the screen appears perfectly sharp to the eye.

Gallery / 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

Most Android Smartphones and Tablets still have some

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

 

iPhone 4

iPhone 5

Galaxy S III

 

 

Overall Assessments

This section summarizes the results of all of the extensive Lab measurements and viewing tests performed on all of the displays.

 

The iPhone 5 display significantly outperforms the displays on the Galaxy S III and iPhone 4. See all the measurements below.

Viewing Tests

Good Images

Photos and Videos

have too little color

and too much contrast

Very Good Images

Photos and Videos

have accurate color

and accurate contrast

Good Images

Photos and Videos

have too much color

and accurate contrast

The Viewing Tests examined the accuracy of

photographic images by comparing the displays

to a calibrated studio monitor and HDTV.

Variation with Viewing Angle

Small Color Shifts

with Viewing Angle

 

Large Brightness Shift

with Viewing Angle

Small Color Shifts

with Viewing Angle

 

Large Brightness Shift

with Viewing Angle

Medium Color Shifts

with Viewing Angle

 

Medium Brightness Shift

with Viewing Angle

Color Shifts are more objectionable than

Brightness Shifts with Viewing Angle.

 

IPS LCDs have Small Color Shifts.

All LCDs have Large Brightness Shifts

Overall Display Assessment

Lab Tests and Measurements

Very Good LCD Display

Excellent LCD Display

Very Good OLED Display

These Flagship displays are all Very Good to Excellent.

Overall Display Calibration

Lab Tests and Viewing Tests

Very Good Calibration

Excellent Calibration

Calibration Needs

Major Improvement

The Galaxy S III has a non-existent Poor Color Gamut

display calibration that needs Major Improvement.

Overall Display Grade

A–

A

B+

The iPhone 5 display performs significantly better

than the iPhone 4 and the Galaxy S III displays.

 

iPhone 4

iPhone 5

Galaxy S III

 

 

 

 

Screen Reflections

Figure 1.  Screen Reflection Photos

Click to Enlarge

All of these screens are large mirrors good enough to use for personal grooming – but it’s 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. The 10 – 15 percent reflections can 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 mirror reflections with anti-reflection coatings and haze surface finishes.

 

The iPhone 5 has significantly lower Reflectance than the iPhone 4 – the iPhone 4 reflects 52 percent more Ambient Light.

Average Screen Reflection

Light From All Directions

Reflects 7.0 percent

Very Good

Reflects 4.6 percent

Excellent

Reflects 5.0 percent

Excellent

Measured using an Integrating Hemisphere.

The best value we have measured is 4.4 percent

and the current worst is 14.8 percent.

Mirror Reflections

Percentage of Light Reflected

 8.1 percent

Good

 6.1 percent

Very Good

 7.1 percent

Very Good

These are the most annoying types of reflections.

Measured using a narrow collimated pencil beam of

light reflected off the screen.

 

iPhone 4

iPhone 5

Galaxy S III

 

 

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 Galaxy S III has a very low Maximum Brightness when the entire screen is white or has a white background.

The low Galaxy S III Brightness is the result of Power Management to maintain a satisfactory Battery Running Time.

The low Galaxy S III Brightness is responsible for its lower Contrast Rating for High Ambient Light.

The iPhone 5 has the highest Contrast Rating for High Ambient Light that we have ever measured.

Measured Maximum Brightness

100% Full Screen White

Brightness 541 cd/m2

Excellent

Brightness 556 cd/m2

Excellent

Brightness 224 cd/m2

Poor

Maximum Brightness is very important for mobile

because of the typically high ambient light levels.

Measured Peak Brightness

1% Full Screen White

Brightness 541 cd/m2

Excellent

Brightness 556 cd/m2

Excellent

Brightness 283 cd/m2

Good

This is the Brightness for a screen that

has only a tiny 1% Average Picture Level.

Black Level

at Maximum Brightness

Black is 0.48 cd/m2

Very Good for Mobile

Black is 0.41 cd/m2

Very Good for Mobile

Less than 0.005 cd/m2

Outstanding

Black brightness is important for low ambient light,

which is seldom the case for mobile devices.

Contrast Ratio

Relevant for Low Ambient Light

1,117

Very Good for Mobile

1,356

Very Good for Mobile

Greater than 45,000

Outstanding

Only relevant for low ambient light,

which is seldom the case for mobile devices.

Defined as Maximum Brightness / Black Brightness.

Contrast Rating

for High Ambient Light

Bright Contrast 77

Very Good

Bright Contrast 121

Excellent

Bright Contrast 45 - 57

Good

Defined as Maximum Brightness / Average Reflectance.

Screen Readability in Bright Light

Very Good    A–

Excellent    A

Good    B

Indicates how easy it is to read the screen

under high ambient lighting. Very Important!

See High Ambient Light Screen Shots

 

iPhone 4

iPhone 5

Galaxy S III

 

 

 

 

Colors and Intensities    

Figure 2.  Color Gamuts

Click to Enlarge

Figure 3.  Intensity Scales

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.

 

The iPhone 5 has a Very Good display calibration, but it is not quite as accurate as the Excellent calibration on new iPad

because its Intensity Scale Gamma is a bit too high, which upsets both the image contrast and color accuracy somewhat.

It is still probably more accurate than any display you own, unless you have a new iPad. See the Color Gamut and

Intensity Scale figures for details and explanations.

White Color Temperature

7,781 degrees Kelvin

Somewhat Too Blue

7,461 degrees Kelvin

Somewhat Too Blue

 7,860 degrees Kelvin

Somewhat Too Blue

D6500 is the standard color of White for most content

and necessary for accurate color reproduction.

Color Gamut

See Figure 2

Gamut Too Small

64 percent of Std

See Figure 2

Essentially Perfect

 104 percent of Std

See Figure 2

Gamut Too Large

139 percent of Std

See Figure 2

sRGB / Rec.709 is the color standard for most

content and needed for accurate color reproduction.

Note that Too Large a Color Gamut is visually

worse than Too Small.

Dynamic Brightness

None

Excellent

None

Excellent

21 percent

This is the percent Brightness reduction with APL

Average Picture Level. Ideally should be 0 percent.

Intensity Scale and Image Contrast

See Figure 3

Very Smooth But

Contrast Too High

See Figure 3

Very Smooth

Contrast is Very Good

See Figure 3

Very Smooth

Contrast is Very Good

See Figure 3

The Intensity Scale controls image contrast needed

for accurate image reproduction. See Figure 3

Gamma for the Intensity Scale

Larger means more Image Contrast

See Figure 3

Good  2.68

Straight and Constant

Gamma Too High

 Very Good  2.36

Straight and Constant

Slightly Too High

Very Good  2.38  But

Dim-end Steepens 2.73

Slightly Too High

Gamma is the slope of the Intensity Scale.

Gamma of 2.20 is the standard and needed for

accurate image reproduction. See Figure 3

 

iPhone 4

iPhone 5

Galaxy S III

 

 

Viewing Angles

The variation of Brightness, Contrast, and Color with viewing angle is especially important for Smartphones because of

their large 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 Smartphones. IPS LCDs generally do well.

 

Note that the Viewing Angle performance is also very important for a single viewer because the Viewing Angle varies based

on how the Smartphone is held, and the angle can be very large if the Smartphone is resting on a table or desk.

 

IPS LCDs have smaller Color Shifts than OLEDs because OLEDs need more anti-reflection correction, which has greater absorption

at larger angles. The Galaxy S III has a surprisingly large Brightness Decrease for an OLED due to its anti-reflection absorption.

Brightness Decrease

at a 30 degree Viewing Angle

 57 percent Decrease

 

Very Large Decrease

60 percent Decrease

 

Very Large Decrease

 28 percent Decrease

 

Large Decrease

Most screens become less bright when tilted.

 

OLED decrease is due to anti-reflection absorption..

LCD brightness variation is generally very large.

Contrast Ratio

at a 30 degree Viewing Angle

556

Very Good for Mobile

594

Very Good for Mobile

Extremely High

Not Measured

A measure of screen readability when the screen

is tilted under low ambient lighting.

Primary Color Shifts

at a 30 degree Viewing Angle

Small Color Shift

Δ(u’v’) = 0.0096

2.4 times JNCD

Small Color Shift

Δ(u’v’) = 0.0077

 1.9 times JNCD

Small Color Shift

Δ(u’v’) = 0.0234

5.9 times JNCD

JNCD is a Just Noticeable Color Difference.

IPS LCDs have smaller color shifts with angle.

Color Shifts for Color Mixtures

at a 30 degree Viewing Angle

Reference Brown (255, 128, 0)

Small Color Shift

Δ(u’v’) = 0.0097

2.4 times JNCD

Small Color Shift

Δ(u’v’) = 0.0098

2.4 times JNCD

Medium Color Shift

Δ(u’v’) = 0.0168

4.2 times JNCD

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.

 

iPhone 4

iPhone 5

Galaxy S III

 

 

Display Power Consumption

Figure 4.  LED Backlight Spectrum

Click to Enlarge

  

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

 

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

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

 

The LCD display on he iPhone 5 is less power efficient than the iPhone 4 because of its larger Color Gamut.

The OLED display on the Galaxy S III is significantly less power efficient than the iPhone LCD displays.

OLEDs are improving but they are currently still less power efficient than the best LCDs.

Display Power

at Maximum Brightness

0.42 watts

0.74 watts

1.3 watts

Lower power consumption is important for energy

efficiency and improving running time on battery.

Display Relative Power Efficiency

same Peak Luminance 556 cd/m2

same 4.0 inch screen size area

0.51 watts

0.74 watts

2.2 watts

This compares the Relative Power Efficiency

by looking at the same screen brightness and

screen area.

 

iPhone 4

iPhone 5

Galaxy S III

 

 

Running Time on Battery

The running time on battery was determined with the Brightness sliders at Maximum, in Airplane Mode,

with no running applications, and with Auto Brightness turned off.

 

Note that Auto Brightness can have a considerable impact on running time but we found abysmal performance for

both the iPhone and Android Smartphones in our BrightnessGate analysis of Ambient Light Sensors and Automatic

Brightness. They all need a more convenient Manual Brightness Control as described in the BrightnessGate article.

 

At Maximum Brightness the iPhone 5 has a shorter Running Time than the iPhone 4, which is not surprising since it

has a larger screen and a larger Color Gamut but roughly the same capacity battery. The lower Brightness limitations

on the Galaxy S III are needed to maintain a satisfactory Running Time.

Running Time

at the Maximum Display Power

7.8 hours

Excellent

6.6 hours

Very Good

5.6 hours

Very Good

Display always On at the Maximum setting with

Airplane Mode and no running applications.

Categories

iPhone 4

iPhone 5

Galaxy S III

Comments

 

 

About the Author

Dr. Raymond Soneira is President of DisplayMate Technologies Corporation of Amherst, New Hampshire, which produces video 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 Smartphone and Tablet displays can be significantly improved using DisplayMate’s 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 and quality control so they don’t make mistakes similar to those that are exposed in our Display Technology Shoot-Out series. We can also improve the performance of any specified set of display parameters. This article is a lite version of our intensive 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 sophisticated 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 smartphones and tablets, and all display technologies including LCD, OLED, 3D, LED, LCoS, Plasma, DLP and CRT. This article is a lite version of our intensive scientific analysis of Smartphone 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. 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. For more information on our technology see the Summary description of our Adaptive Variable Metric Display Optimizer AVDO. 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:  Apple new iPad, iPad 2, and iPhone 4 Display Technology Shoot-Out

Article Links:  Samsung Galaxy S I II III OLED Display Technology Shoot-Out

 

Article Links:  Smartphone Displays Under High Ambient Lighting Shoot-Out

Article Links:  Automatic Brightness Controls and Light Sensors

 

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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