Screens

Two technologies used for displays are liquid crystal displays (LCD) and light-emitting diodes (LED).The two specific choices in Android phones are thin-film transistor (TFT) LCDs and active-matrix organic LED displays (AMOLED).A benefit of TFT displays is a longer lifetime. A benefit of AMOLED displays is no need for backlighting and therefore deeper blacks and lower power.

Overall,Android devices are categorized into small, normal, and large screens and low-, medium-, and high-pixel density. Note that the actual pixel density might vary but will be chosen as one of these.A summary of currently available device screens is shown in Table 1.3. Note that Table 1.1 provides the screen density classification for each device listed.

Table 1.3 Summary of Device Screens Supported by Android

Screen

Low-Density

Medium-Density

High-Density

Type

(~120ppi), ldpi

(~160ppi), mdpi

(~240ppi), hdpi

Small

QVGA (240x320), 2.6-inch

screen

to 3.0-inch diagonal

Normal

WQVGA (240x400),

HVGA (320x480), 3.0-

WVGA (480x800),

screen

3.2-inch to 3.5-inch

inch to 3.5-inch

3.3-inch to 4.0-inch

diagonal

diagonal

diagonal

FWQVGA (240x432), 3.5-

FWVGA (480x854),

inch to 3.8-inch diagonal

3.5-inch to 4.0-inch diagonal

Large

WVGA (480x800),

screen

FWVGA (480x854), 5.0-inch to 5.8-inch diagonal

Hardware Differences on Android Devices 9

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