S15 - Mobile Devices

Question 1

Smartphones & tablets are considered mainly as

Answer 1

Consumption devices as the goal is to consume information and typically not generate

Question 2

Name the two types of touch-screen

Answer 2

capacitive, multi-touch

Question 3

Define capacitive touch screen

Answer 3

Any touchscreen that works by seeing the distortion in an electrostatic field, cheaper & single tactile (1 input at a time)

Question 4

define multi-touch touchscreen

Answer 4

Can process 2 or more contact point simultaneously, more expensive & very common

Question 5

What types of displays exist

Answer 5

LCD, LED, OLED

Question 6

Define Liquid-Crystal-Display (LCD)

Answer 6

Uses liquid crystal where the properties can changes the application of the voltage

Question 7

Define Pixel (picture element)

Answer 7

Individual point on a screen inside of a display

Question 8

What are we talking about when mentioning A thin-film transistor (TFT)

Answer 8

the LCD panel

Question 9

3 types of TFT

Answer 9

Twisted Nematic (TN), In-plan switching (IPS), Vertical alignment (VA)

Question 10

Define twisted nematic (TN)

Answer 10

contains crystals that twist or untwist in response to the voltage being applied or removed, earliest type of TFT & fast response time

Question 11

Define In-plane switching (IPS)

Answer 11

Uses crystals that rotate to be able to deliver colour, better colour display from different angles & 178degree horizontal and vertical viewing angles

Question 12

What is more commonly used Twisted Nematic or In-Plane switching and why

Answer 12

In-Plane switching as it allows for similar speeds to TN however as the crystals rotate instead of twist, this means that viewing angles are improved and you don’t need to see the display face on

Question 13

Define Vertical Alignment (VA)

Answer 13

Crystals are tilted to be able to deliver colour, has contrast ratio x2-3 compared to IPS but viewing angles and reaction times are worse

Question 14

Define cold cathode fluorescent lamp (CCFL)

Answer 14

Lamp that sites behind the display and lights up the liquid crystal display to show the colours and images properly on the screen

Question 15

What does CCFL require for power

Answer 15

Converting of power from battery to AC voltage

Question 16

Define light-emitting diode (LED)

Answer 16

Newer form of light that uses direct current (DC), less power usage and better performance

Question 17

Define organic LED (OLED)

Answer 17

Each pixel as its own separate LED that provides the light, can be made from plastic rather than glass meaning they can be folded, manipulated

Question 18

Drawbacks of OLED

Answer 18

Low maximum brightness, susceptible to burn in (Same image being on display for hours, consequently being burnt into the OLEDs)

Question 19

Define digitizer

Answer 19

Layer sandwiched between a layer of protective glass and the display panel inside the touchscreen display, provide haptic feedback (e.g. little vibration)

Question 20

Define accelerometer

Answer 20

combination device that uses hardware and software to measure the velocity, rotation and shaking of a mobile device.

Question 21

What are 2 purposes of the accelerometer

Answer 21

Screen orientation for phones - knowing when to change from vertical to horizontal, Used for gaming for e.g. car games where you need to turn the device to create a turn left or right input

Question 22

Define gyroscope

Answer 22

An improved version of the accelerometer, allows for x, y, z instead of just x and y. horizontal, vertical, depth axis

Question 23

Define track pad

Answer 23

device that can be used to manipulate the cursor across the screen. Type types: embedded & external

Question 24

Define drawing pad

Answer 24

Large format touch device attached as a peripheral to a laptop, tablet, smartphone or tablet. Uses a touch pen

Question 25

Define microphone

Answer 25

Any device used to record audio or capture voice when making a phone call

Question 26

Define speaker

Answer 26

allows to hear things that are coming out from devices, such as music or videos

Question 27

Define headset

Answer 27

Combines both mic and speaker into one device

Question 28

Define digital camera

Answer 28

Provides the ability to capture a live image in a still format

Question 29

Define cellular

Answer 29

Network that allows to connect to the internet using cellular radio inside the handset and connect to a network service provider

Question 30

What are the two main cellular technologies

Answer 30

GSM or CDMA (based on which area of the world you're living in + network provider)

Question 31

Define Global system for mobile communication (GSM)

Answer 31

Cellular technology that takes the voice during a call and converts it into a digital format

Question 32

Define Code-division multiple access (CDMA)

Answer 32

cellular technology that uses code division to split up the channel

Question 33

Compare CDMA and GSM

Answer 33

CDMA is more power and flexible compared to GSM

Question 34

Define Sim card

Answer 34

how you identify yourself to a network in a GSM network

Question 35

define electronic code

Answer 35

Used by CDMA, allows for electronic changing of SIM and is a cheaper way of getting data service overseas

Question 36

Define preferred roaming list (PRL)

Answer 36

Contains al the information about different cellular towers

Question 37

Define bluetooth

Answer 37

uses a short range point to point connection between a mobile device and an accessory

Question 38

Define universal asynchronous receiver-transmitter (UART)

Answer 38

Device that allows to connect to a device and get information about it

Question 39

Define port replicator

Answer 39

uses the exact same features as a laptop, beneficial for saving time e.g. (plug all cables into the replicator and then just plug in the single for the laptop) MAKES LIFE EASIER

Question 40

Define docking station

Answer 40

Advanced type of port replicator that provides all the capabilities and features of a laptop + extra (some contain HDDs, ports that don't already exist)

Question 41

port replicator and docking station simplification (2 words each)

Answer 41

PR: port mirror DS: additional ports