Mobile Devices Flashcards
What is the key difference between capacitive touchscreens and multi-touch screens?
Capacitive touchscreens detect distortions in an electrostatic field for single touch, while multi-touch screens can register multiple points of contact simultaneously for gestures like pinch-to-zoom.
What is the main difference between TN, IPS, and VA LCDs?
TN offers fast response times but poor color and viewing angles, IPS provides better color accuracy and wider viewing angles, while VA offers superior contrast at the cost of slower response times.
How does LED backlighting improve LCD displays?
LED backlighting replaces CCFL, making LCDs more energy-efficient, thinner, and enhancing battery life.
What is a unique feature of OLED displays compared to LCDs?
OLED displays do not require a backlight, making them thinner, more power-efficient, and capable of bendable or foldable designs.
What is a disadvantage of OLED displays?
OLEDs have lower brightness than traditional LCDs and are susceptible to burn-in with static images.
What is the function of a digitizer in a mobile device?
The digitizer converts analog touch input into digital signals and is often protected by durable glass.
What are the primary uses of an accelerometer in a mobile device?
It detects X and Y-axis movement for functions like screen orientation and fall detection, and is also used in motion-based gaming.
What does a gyroscope add to a mobile device that an accelerometer doesn’t?
A gyroscope detects movement along the Z-axis, enabling 3D spatial awareness and improving gaming, gesture control, and image stabilization.
What is the main difference between 802.11ac and 802.11g Wi-Fi standards?
802.11ac provides faster speeds than 802.11g, but both require compatible devices for optimal performance.
What is the main difference between GSM and CDMA cellular technologies?
GSM uses time-division to convert voice to digital, while CDMA uses code-division for encrypted transmission.
What is the primary purpose of a mobile hotspot?
A mobile hotspot allows devices to share cellular data with other devices via USB tethering, Bluetooth, or Wi-Fi.
What is a key requirement for Bluetooth devices to connect?
Devices need to be in discoverable mode and may require a PIN or passkey for secure pairing.
What is the primary use of NFC in mobile devices?
NFC is used for secure, proximity-based mobile payments and can also be used for device pairing and data sharing.
What is the key difference between iOS and Android device connections?
iOS devices use proprietary Lightning cables, while Android devices primarily use USB-C.
What is an advantage of USB-C over Lightning cables?
USB-C supports faster data transfer speeds and can be used for both charging and data transfer in a compact design.
