Datasheet

Phone Features
x
3
Screen Resolution
All the Windows Phone 7 devices available at launch (sometimes called “Chassis 1” devices) are
required to have a screen resolution of 480 by 800 pixels, also known as Wide Video Graphics
Array (WVGA). Devices made available after launch (cleverly referred to as “Chassis 2” devices)
may instead support a screen resolution of 480 by 320 pixels, also known as Half-size Video
Graphics Array (HVGA).
PHONE FEATURES
In addition to a fi xed resolution, all Windows Phone 7 devices are required to ship with support for
multitouch, an accelerometer, GPS, a camera, and a number of other features. Let’s take a closer
look at some of these required features.
Capacitive Touch
All Windows Phone 7 devices are required to incorporate capacitive-touch screens that have sup-
port for at least four contact points. However, none of the default gestures shipping with XNA 4.0
(which are described in detail in Chapter 4) actually use more than two touches at once.
Capacitive sensors detect anything that is conductive or that has dielectric prop-
erties (meaning it can store and discharge magnetic or electric energy). This
is why you can wipe the phone’s screen on your shirt without worrying about
launching every app you own at once. In contrast, resistive-touch screens detect
all pressure as input.
Capacitive-touch screens have advantages and disadvantages compared to resistive-touch screens, as
shown in Table 1-1.
TABLE 1-1: Advantages and Disadvantages of Capacitive-Touch Screens
ADVANTAGES DISADVANTAGES
Capacitive-touch screens respond only to materi-
als that are conductive (such as your fi nger), so
you can clean them with a cloth without acciden-
tally triggering input.
A regular stylus cannot be used with a capaci-
tive-touch screen unless it is tipped with some
form of conductive material.
Capacitive-touch screens are faster and more
responsive than their resistive counterparts.
Capacitive-touch screens are more expensive to
manufacture.
Capacitive-touch screens are less accurate than
resistive-touch screens.
c01.indd 3c01.indd 3 1/31/2011 3:27:12 PM1/31/2011 3:27:12 PM