GSMArena.com GSMArena.com

Tip us

1.5m
109k
RSS

EV

Merch

Log in

Login

I forgot my password
Sign up
  • Home
  • News
  • Reviews
  • Videos
  • Featured
  • Phone Finder
  • Deals
  • MerchNew
  • Coverage
  • Contact
ADVERTISEMENTS
GSMArena team, 26 April 2012

The tests


GSMArena feature labs: The tests

  • Comments (152)

2. Display tests: contrast and sunlight legibility
  1. 1. Introduction
  2. 2. Display tests: contrast and sunlight legibility
  3. 3. Speakerphone loudness (DISCONTINUED)
  4. 4. Audio output quality (DISCONTINUED)
  5. 5. Camera and video compare (UPDATED)
  6. 6. Battery life
  7. 7. Speaker test
  8.  
  9. Review comments (152)

Misc

Display

With displays, it is easy to get caught in the hype as technology buzzwords are meant to grab your attention rather than describe the actual screen quality. Super AMOLED, HD-IPS, Super LCD, Retina IPS, and whatnot, each claim to offer the best image quality around, but usually find it unnecessary to provide specific numbers, which would make technologies easier to compare.

On the rare occasions that display specs are actually quoted, the numbers are purposely chosen to be misleading and make the real-life performance seem much better than it really is. Which is where our first test comes in.

Perhaps the most important factor when it comes to screen quality is the contrast ratio. Contrast ratio is the measure of the dynamic range of the luminance of the display, essentially describing how much darker the deepest blacks are than the brightest whites. A display with a good contrast ratio is able to show richer, more vibrant still images and videos that come to life.

The brightness of a given object is measured in candela (cd), which is the scientific unit for luminance. One candela--which stands for candle in Latin--is the equivalent of the light intensity of one candle as perceived by the human eye. For displays, light is measured per square meter of surface area (cd/m2), which is sometimes also referred to as Nits (nt).

The contrast ratio itself is determined by measuring the cd/m2 of a pure white screen, and dividing it by the cd/m2 of a pure black screen (note that on an LCD a pure black screen is not the same as a screen which is turned off, because even black pixels emit some light). So, a display which has 100 cd/m2 of whites and 1 cd/m2 of blacks will have a contrast ratio of about 100:1.

An important note about AMOLEDs is due here. As AMOLED units have the ability to completely switch off individual pixels, their black level readings are 0, which gives them an infinite contrast ratio under the testing conditions.

When we measure, we take two readings off each device - first with the display brightness set to 50% and then with the brightness setting pushed all the way up.

Contrast ratio is very heavily influenced by the black levels of a display. While a brighter display would normally have an advantage, it will usually be unable to compensate for insufficiently deep blacks.

Sunlight legibility (DISCONTINUED)

Update Mar 4, 2020: This review test has been discontinued. You can find the full explanation of the test below but it's no longer carried out on new devices. The reason for the change is that we realized AMOLEDs were universally better than LCDs in this test. And inside the two groups, the results didn't vary significantly enough to make a difference. When a test result becomes predictable just by looking at the specs on paper, it's time to move on.

While having a good quality display is important, the reflectivity of the screen is not to be neglected. After all, you rarely use your smartphone in complete darkness, so there's little use of having a premium screen that turns into a mirror in bright environments.

Our sunlight legibility test aims to show you how legible each screen remains in bright environments, where screen reflectivity matters as much as its natural contrast and brightness. We use fixed studio lighting to simulate sunlight falling on the phone screens and measure the contrast ratio of each of them when faced with this powerful light source. We measure each display with the brightness turned up to 100% manually so any brightness boost or overdrive that may be available in Auto mode is not taken into account.


Apple iPhone 4S • Samsung Galaxy S II • Samsung Galaxy Note • HTC One X • HTC One S

The perceived sunlit contrast ratio is then calculated based on the values of the blacks and whites visible on the display. The higher the value here, the more visible the screen in bright sunlight.

And before you start asking for a "real life" test (typical indoor lighting), you should know that contrast loss is linear, so you should be able to make out the usual performance as an average of the two scores we provide. Our test is obviously based on two extremes: the pitch black room and the bright outdoors. Adding something in between wouldn't make much sense, as there's no standard for how bright a home or office is.

Next Page » 3. Speakerphone loudness (DISCONTINUED)
2. Display tests: contrast and sunlight legibility
  1. 1. Introduction
  2. 2. Display tests: contrast and sunlight legibility
  3. 3. Speakerphone loudness (DISCONTINUED)
  4. 4. Audio output quality (DISCONTINUED)
  5. 5. Camera and video compare (UPDATED)
  6. 6. Battery life
  7. 7. Speaker test
  8.  
  9. Review comments (152)

Reviews GSMArena feature labsPage 2
  • Comments (152)

Phone finder

  • Samsung
  • Apple
  • Huawei
  • Nokia
  • Sony
  • LG
  • HTC
  • Motorola
  • Lenovo
  • Xiaomi
  • Google
  • Honor
  • Oppo
  • Realme
  • OnePlus
  • vivo
  • Meizu
  • BlackBerry
  • Asus
  • Alcatel
  • ZTE
  • Microsoft
  • Vodafone
  • Energizer
  • Cat
  • Sharp
  • Micromax
  • Infinix
  • TCL
  • Ulefone
  • Tecno
  • Doogee
  • Blackview
  • BLU
  • Panasonic
  • Plum

All brands Rumor mill

ADVERTISEMENTS

Related articles

  • Sir Ridley Scott used a Galaxy S23 Ultra to shoot a short film
  • Twitter confirms why some third-party apps aren’t working anymore
  • Apple set to finally open Apple Stores in India, hiring has begun
  • Kuo: Apple's mixed-reality headset could arrive as early as the Spring
ADVERTISEMENTS

Popular reviews

Apple iOS 14 review

Apple iOS 14 review
Xiaomi Mi 10 Ultra review

Xiaomi Mi 10 Ultra review
Samsung Galaxy Note20 Ultra 5G review

Samsung Galaxy Note20 Ultra 5G review

ELECTRIC VEHICLES

Nio prepares to launch 2 more unannounced EVs in next few months Nio prepares to launch 2 more unannounced EVs in next few months Xiaomi demands payout from supplier over leaked imagesCanalys: Indian EV market grows a whopping 223% in 2022
ADVERTISEMENTS

Home News Reviews Compare Coverage Glossary FAQ RSS feed Youtube Facebook Twitter Instagram

© 2000-2023 GSMArena.com Mobile version Android app Tools Contact us Merch store Privacy Terms of use Change Ad Consent Do not sell my data