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A+ Sections 1-27 1011 > S15 - Mobile Devices > Flashcards

S15 - Mobile Devices Flashcards

1
Q

Smartphones & tablets are considered mainly as

A

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

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2
Q

Name the two types of touch-screen

A

capacitive, multi-touch

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3
Q

Define capacitive touch screen

A

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

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4
Q

define multi-touch touchscreen

A

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

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5
Q

What types of displays exist

A

LCD, LED, OLED

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6
Q

Define Liquid-Crystal-Display (LCD)

A

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

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7
Q

Define Pixel (picture element)

A

Individual point on a screen inside of a display

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8
Q

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

A

the LCD panel

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9
Q

3 types of TFT

A

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

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10
Q

Define twisted nematic (TN)

A

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

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11
Q

Define In-plane switching (IPS)

A

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

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12
Q

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

A

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

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13
Q

Define Vertical Alignment (VA)

A

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

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14
Q

Define cold cathode fluorescent lamp (CCFL)

A

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

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15
Q

What does CCFL require for power

A

Converting of power from battery to AC voltage

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16
Q

Define light-emitting diode (LED)

A

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

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17
Q

Define organic LED (OLED)

A

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

18
Q

Drawbacks of OLED

A

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

19
Q

Define digitizer

A

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

20
Q

Define accelerometer

A

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

21
Q

What are 2 purposes of the accelerometer

A

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

22
Q

Define gyroscope

A

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

23
Q

Define track pad

A

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

24
Q

Define drawing pad

A

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

25
Q

Define microphone

A

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

26
Q

Define speaker

A

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

27
Q

Define headset

A

Combines both mic and speaker into one device

28
Q

Define digital camera

A

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

29
Q

Define cellular

A

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

30
Q

What are the two main cellular technologies

A

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

31
Q

Define Global system for mobile communication (GSM)

A

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

32
Q

Define Code-division multiple access (CDMA)

A

cellular technology that uses code division to split up the channel

33
Q

Compare CDMA and GSM

A

CDMA is more power and flexible compared to GSM

34
Q

Define Sim card

A

how you identify yourself to a network in a GSM network

35
Q

define electronic code

A

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

36
Q

Define preferred roaming list (PRL)

A

Contains al the information about different cellular towers

37
Q

Define bluetooth

A

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

38
Q

Define universal asynchronous receiver-transmitter (UART)

A

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

39
Q

Define port replicator

A

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

40
Q

Define docking station

A

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)

41
Q

port replicator and docking station simplification (2 words each)

A

PR: port mirror
DS: additional ports

A+ Sections 1-27 1011 (27 decks)

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