8-A Flashcards
What is the main characteristic that defines a mobile device?
Its form factor closely integrates both the system components and peripheral devices for video, sound, and input control.
What display technology is most commonly used in mobile devices?
Liquid Crystal Displays (LCD)
What are the primary colors generated by each pixel in a color LCD?
- Red
- Green
- Blue
What does TFT stand for in the context of LCD technology?
Thin Film Transistor
What are the three main types of TFT technology?
- Twisted Nematic (TN)
- In-Plane Switching (IPS)
- Vertical Alignment (VA)
What is the difference between refresh rate and response time?
Refresh rate is the speed at which the whole image is redrawn, measured in Hz, while response time is the time taken for a pixel to change color, measured in milliseconds (ms).
What are the advantages of In-Plane Switching (IPS) displays?
- Better color reproduction
- Wider range of viewing angles
What is the main drawback of Vertical Alignment (VA) displays?
Worse response times compared to TN displays, making them more prone to motion blur and ghosting.
How do LED backlit displays illuminate the screen?
Using an array of light-emitting diodes (LED) to provide illumination.
What is a key advantage of Organic LED (OLED) displays?
Better contrast ratios and the ability to produce thinner, lighter displays with lower power consumption.
What is the purpose of a digitizer in a touchscreen?
To convert analog touch input to digital software instructions.
What does multitouch support in capacitive digitizers enable?
Gestures such as ‘sweeping’ or ‘pinching’ to be interpreted by software.
What is the function of accelerometers and gyroscopes in mobile devices?
To detect changes in device position and adjust the screen orientation appropriately.
List some popular accessories for mobile devices.
- Touchpads
- Trackpads
- Drawing pads
- Touch pens
- Microphones
- Speakers
- Cameras/Webcams
What is the difference between a touchpad and a trackpad?
A touchpad is usually embedded in a laptop, while a trackpad often refers to a larger-format device attached as a peripheral.
What are the main uses of touch pens or styluses?
For precise control, handwriting, and drawing.
What are the two types of cellular data networking technologies?
- Global System for Mobile Communication (GSM)
- Code Division Multiple Access (CDMA)
What does GSM allow users to do with their handsets?
Use a removable subscriber identity module (SIM) card with their chosen network provider.
What is the primary function of Airplane Mode on mobile devices?
To disable some or all wireless features to comply with airline restrictions.
What does LTE stand for in cellular networking?
Long Term Evolution
What does the icon on the status bar indicate when the cellular radio is enabled?
Which generation of data connection has been established.
What is a mobile hotspot?
A smartphone or tablet configured to share its cellular data connection with other devices.
Fill in the blank: The maximum brightness of an OLED display may be ______ compared to LCDs.
lower
True or False: Organic LED displays require a separate backlight.
False
What does mobile hotspot enable?
Sharing a cellular data connection with other devices
A mobile hotspot allows other devices to connect as they would with any Wi-Fi access points.
What is the primary function of tethering?
Connecting another device to share a smartphone’s cellular data connection
Tethering can be done via USB or Bluetooth.
List the standard wired ports typically found on laptops.
- HDMI
- DisplayPort/Thunderbolt
- VGA
- DVI
- USB Type A
- USB Type C
- Microphone jack
- Speaker jack
- RJ45 (Ethernet)
- Memory card reader
What connector do modern Android devices primarily use?
USB-C
Older devices may use Micro-B USB or Mini-B connectors.
What type of connector do most iPhone and iPad devices use?
Lightning connector
Some latest iPad models, like the iPad Pro, now use USB-C.
What is a UART port?
A software serial interface used for programming and peripheral connectivity
UART data can be transferred over USB or Bluetooth on Android devices.
What is the maximum range for NFC data transmission?
About 20 cm (8 in)
NFC is used for contactless transactions and connecting devices.
What is required to enable Bluetooth on a device?
It must be enabled through device settings
The device name may also be changed for public display.
What must both devices do to connect via Bluetooth?
Be in discoverable or pairing mode
What is the primary purpose of a port replicator?
To provide additional ports for peripheral devices
It connects either to a special connector or via USB.
What distinguishes a docking station from a port replicator?
A docking station may support add-in cards or drives
It allows a portable computer to function like a desktop.
Fill in the blank: A smartphone dock connects the device to a monitor, external speakers, and keyboard/mouse input devices via the mobile’s _______.
USB or Lightning port
True or False: Tethering is always allowed by mobile carriers without any restrictions.
False
Some carriers only allow tethering as a chargeable service add-on.
What are the three major wallet apps that use NFC for mobile payments?
- Apple Pay
- Google Pay
- Samsung Pay
What should you check if you cannot connect a device over Bluetooth?
Ensure both devices are discoverable
What type of sensor must smartphone models have to use digital payments?
NFC sensor
What type of wireless connection does Bluetooth create?
A short-range personal area network (PAN)
