The GSM Arena website compiles a database of a variety of specifications for each phone it reviews. It also runs a battery of tests on each device, including one that reveals the nominal contrast ratio of each phone's display. The value of this test is that it evaluates each display's contrast ratio objectively, rather than relying on data provided by phone manufacturers. Of the phones tested by GSM Arena, the HTC One X+, Google Nexus 4, Apple iPhone 5 and HTC Butterfly have the highest nominal contrast ratios when set to 100 percent brightness in indoor conditions, as of March 2013.
HTC One X+
The HTC One X+ is an Android smartphone that features a 4.7-inch touchscreen display with a resolution of 720 by 1280 pixels. The phone has a nominal contrast ratio of 1,400 to 1 when set to 100 percent brightness, according to tests performed by GSM Arena. Additional features of the One X+ include a 1.7-GHz quad-core processor, 64GB of onboard storage, 1GB of RAM, an 8-megapixel camera, Wi-Fi, Bluetooth and GPS. HTC outfits the device with a 2,100-mAh rechargeable battery that provides the phone with up to 13 hours of talk time per charge.
Google Nexus 4
Like the One X+, the Google Nexus 4 is an Android-powered smartphone. It features a 4.7-inch touchscreen display with a resolution of 768 by 1280 pixels and a contrast ratio of 1,341 to 1, according to GSM Arena. The Nexus 4 is powered by a 1.5-GHz quad-core processor and 2GB of RAM. Additional features include 8GB of onboard storage, an 8-megapixel digital camera, a microSD memory card expansion slot, Bluetooth, GPS and Wi-Fi. The phone has a 2,100-mAh battery that gets up to 15 hours of talk time per charge.
Apple's flagship iPhone 5 features a 4-inch touchscreen display with a resolution of 1136 by 640 pixels and a contrast ratio of 1,320 to 1, according to GSM Arena. The iPhone 5 features a 1.2-GHz dual-core processor, up to 64GB of onboard storage and 1GB of RAM. Apple outfits the device with an 8-megapixel camera, Wi-Fi, Bluetooth, GPS and a 1,440-mAh battery that supplies the phone with up to eight hours of talk time per charge.
The HTC Butterfly is an Android-powered smartphone with a 5-inch touchscreen. The Butterfly's screen has a resolution of 1080 by 1920 pixels and a tested contrast ratio of 1,104 to 1, according to GSM Arena. HTC outfits the phone with a 1.5-GHz quad-core processor, 2GB of RAM, 16GB of onboard storage and a microSD memory card expansion slot compatible with cards up to 32GB in size. Additional features include an 8-megapixel camera, Bluetooth, GPS and Wi-Fi. HTC outfits the device with a 2,020-mAh battery.