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December 27th > Mobile Display Types > Flashcards

Mobile Display Types Flashcards

1
Q

Mobile Consumption Devices

3

A
  • Smartphones or Tablets
  • Consume information and not produce information
  • Typically have touchscreens
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2
Q

Touchscreens

2 Types (8 answers)

A
  1. Capacitive touch screen
    - Any touchscreen that works by seeing the distortion in an electrostatic
    field
    - Distortion is mesured using X/Y coordinate to machine in place of mouse pointer
    - Single tactile input (One touch at a time)
  2. Multi-touch
    - Can process two or more contact points simultaneously
    - Allows you to use two or more fingers
    - Standard among most tablets or mobile devices
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3
Q

LCD

A

Liquid-Crystal Display
1. Liquid Crystals:
- At the core of an LCD are tiny molecules called liquid crystals.
These crystals can change the way light passes through them when electricity is applied.
Backlight:
- An LCD doesn’t produce its own light. Instead, it uses a backlight (like LEDs) to shine light through the layers of the display.
2. Color Filters and Pixels:
- The screen is divided into millions of tiny units called pixels.
Each pixel has three sub-pixels—red, green, and blue—that combine to create colors.
- The liquid crystals control how much light passes through each sub-pixel, which determines the pixel’s brightness and color.
3. Image Formation:
- By adjusting the light for each pixel, the display forms images, text, and videos that you see on the screen.
- Key Features of LCD Displays:
Thin and Lightweight: LCDs are much thinner and lighter than older display types like CRT monitors.
Energy Efficient: They use less power, especially when combined with LED backlighting.
Clear Picture: LCDs provide sharp, bright images and are widely used in modern devices.

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4
Q

LED (Back lit)

5

A

Light Emitting Diode
- Newer form of light that uses direct current (DC)
- Still going to use TN, IPS, or VA
- Instead of using CCFL to backlight you will use LED powered by DC
- Uses less power leading to longer battery life and better performance

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5
Q

OLED

9

A

Organic Light Emitting Diode
- Each pixel has its own separate LED that provides the light
- Panel doesn’t require separate backlight
- Better contrast ratios
- Display can be thinner
- less power intensive leading to longer battery life
- can be made of plastic
Can be folded, rolled, or manipulated to create different shapes and sizes without damaging components
Cons
- Maximum brightness not as bright as LCD ( cant see in bright sun)
- Susceptible to Burn in (same static image)

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6
Q

Pixel

2

A
  • Picture Element
  • Individual point on a screen inside of a display
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7
Q

TFT

3 types

A

Thin-film Transistor
- referred to as an LCD panel
- All require backlight
1. Twisted Nematic (TN)
2. In-Plane Switching (IPS)
3. Vertical Alignment (VA)

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8
Q

Twisted Nematic (TN)

6

A
  • Contains crystals that twist or untwist in response to the voltage being
    applied or removed
  • Twist
  • Earliest type of TFT technology
  • Found in Budget laptops, tablet, and smart phones
  • Supports fast response times
  • less motion blur or ghosting when used with something that has a high frame rate
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9
Q

In-Plane Switching (IPS)

5

A
  • Uses crystals that rotate to be able to deliver color
  • Rotate
  • Better color reproduction at a wider range of viewing angles
  • Most IPS panels can support 178 degrees horizontal and vertical viewing angles (Almost view on the side
  • Response times close to TN
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10
Q

Vertical Alignment (VA)

6

A
  • Crystals are tilted to be able to deliver color
  • Tilt
  • Contrast ratio 2-3x better than IPS
  • Really dark darks and really light lights
  • viewing angles not as good as IPS and
  • response times are slower than IPS and TN (will get motion blur or ghosting when viewing fast images on display
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11
Q

Contrast Ratio

1

A

The ratio between the brightest white and the darkest black a display can produce

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12
Q

Back lights

A
  • CCFL
  • Used to light up display panel
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13
Q

Cold Cathode Fluorescent Lamp (CCFL)

3

A
  • Lamp that sits behind the display and lights up the liquid crystal display to show the colors and images properly on the screen
  • If burns out or stops working you wont be able to see things on screen without back light
  • Requires AC voltages (Inverter is installed to convert DC to AC)
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14
Q

Mobile display Types

A

LCD
LED
OLED

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15
Q

Burn-in

A
  • same static image
  • a permanent discoloration or “ghost image” that appears on the screen due to leaving a static image displayed for an extended period, causing certain pixels to degrade faster than others
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16
Q

Mobile Device Components

3 types

A
  1. Digitizer
  2. Accelerometer
  3. Gyroscope
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17
Q

Digitizer

3

A
  • Layer sandwiched between a layer of protective glass and the display
    panel inside of a touchscreen display
  • Converts touch input into digital software instructions used by operating system
  • Provide haptic feedback to end-user (Vibration when typing on touch key board)
18
Q

Haptic Feedback

2

A
  • Vibration when touching a key on a touchscreen keyboard
  • Form of touch responsiveness from the display back to the end-user.
19
Q

Accelerometer

5

A
  • Combination device that uses hardware and software to measure the
    velocity, rotation, and shaking of a mobile device
  • Focuses on movement cause by Gravity, vibration, quick acceleration
  • Uses: Screen orientation, data loss prevention (detects dropping to stop actuator from reading HD), and gaming (driving games).
  • Does well with X axis (Roll, Horizontal), and Y axis (Pitch, Vertical)
  • Does not do well with Z (Yaw, Depth)
20
Q

Gyroscope

6

A
  • An improved version of the basic accelerometer
  • Pitch (Y, Vertical), Roll (X, Horizontal), and Yaw (Z, Depth)
  • Flight simulator
  • 3D photos and videos
  • Gestures (Shake,
  • Image stabilization
21
Q

Mobile device accessories

8

A
  1. Track pads
  2. Drawing pads
  3. Touch pens
  4. Microphones
  5. Speakers
  6. Headsets
  7. Cameras
  8. Webcams
22
Q

Track Pad

A
  • Device that can be used to manipulate the cursor on the screen
  • two types (Embedded, External (USB))
23
Q

Drawing Pad

3

A
  • Large format touch device attached as a peripheral to a laptop,
    smartphone, or tablet
  • two forms (one looks like large track pad
    drawing pads need a touch pen to uses display
  • most basic form is a signature pad
24
Q

Microphone

A
  • Any device used to record audio or capture voice when making a phone
    call
25
Q

Speakers

1

A
  • Allows to hear things that are coming out from devices, such as music or
    videos
26
Q

Headset

A

Combines both the microphone and speaker into one device

27
Q

Digital Camera

1

A

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

28
Q

Webcam

A

Used to record video

29
Q

Wi-Fi (Wireless Network

A

Wi-Fi Overview:
- Wi-Fi Types: Includes standards like 802.11a, b, g, n, ac, and ax, each offering varying speeds and capabilities.

Requirements for Wi-Fi:
- Wireless Radio: A wireless card or radio in your device.
- Wireless Access Point (WAP): A device to transmit and manage the wireless signal.

Key Factors Affecting Wi-Fi Performance:
- Speed Determination:
The operating speed is limited by the slower device, whether it’s the wireless card or the WAP.
- Even if one supports faster speeds, the connection operates at the slower device’s capability.

Device Size and Antenna:
- Smaller devices (e.g., smartphones) have smaller antennas, leading to slower speeds compared to larger devices (e.g., laptops or desktops).
**
Enabling/Disabling Wi-Fi:**
- Settings: Wi-Fi can be turned on or off via the device’s settings menu or quick settings panel.

30
Q

Cellular

A

Cellular Networks Overview:
- Definition: A cellular network enables devices to connect to the Internet and communicate through cellular radio, using a network service provider’s infrastructure.

Key Features:
Cellular Technologies:
- Operate on GSM (Global System for Mobile Communications) or CDMA (Code Division Multiple Access).
- Differences between GSM and CDMA were significant before 3G, but with 3G, 4G, and 5G, the gap has largely disappeared.

Controlling Cellular Connectivity:
- Enable/Disable Cellular: Access the settings menu or quick settings (via a swipe gesture) to toggle cellular connectivity.
- Airplane Mode: Disables all cellular connections, along with Wi-Fi and Bluetooth, for compliance with flight regulations or to conserve battery.

31
Q

GSM

A
  • Global System For Mobile Communication
  • Cellular technology that takes the voice during a call and converts it into a
    digital format
  • In US T-Mobile and At&t rely on GSM
  • most places in the world reliess on
  • More widely suppored acorss globe
  • Uses SIM card
32
Q

CDMA

8

A
  • Code-Division Multiple Access
  • Cellular technology that uses code division to split up the channel
  • Verizon rely on CDMA
  • Japan or south Korea
  • More powerful and flexible than GSM
  • Doesnt use SIM cards uses electronic code (Issues with changing provider, locked to phone)- Can useelectronic SIM to get around this.
    ● W-CDMA (Wideband CDMA)
    ● UMTS (Universal Mobile Telecommunications System)
33
Q

PRL

4

A

Preferred Roaming List
- Can update PRL in setting or using phones numeric keys
- Contains all the information about different cellular towers
- Restrictions vary from model to model and depends on the device’s country of origin

34
Q

Bluetooth

A

Bluetooth Overview:
- Definition: Bluetooth is a short-range, point-to-point wireless network connection used to link mobile devices with accessories like headphones, speakers, or smartwatches.

Steps to Pair and Connect:
- Enable Pairing Mode: Turn on Bluetooth and activate pairing mode on both devices.
- Find and Select Device: Locate the accessory in the device’s Bluetooth settings.
- PIN Validation (if required): Some devices need a PIN code for pairing. If unsure, consult the manufacturer’s manual. Devices with easy pairing mode may automatically exchange passcodes.
- Testing the Connection: Once paired, test functionality (e.g., play music, test buttons, or confirm accessory operation) to ensure proper connectivity.

35
Q

NFC

9

A

Near-Field Communication
- Allows a device to receive and send information in the NFC format
- The pairing process can be done automatically by using NFC connection
- Most modern devices have NFC transceiver in them
- Allows for the transmision of data over short distances (Normally 2-4 inches, can be as high as 8 inches)
- Most of the time is used for contactless pay (Apple pay)
- can be disabled in settings
- is not only used for contactless pay
- can also be used to connect airpods

36
Q

Hotspot

A
  • a physical location where users can access the internet wirelessly through a Wi-Fi network, typically provided by a router connected to an internet service provider; essentially, a publicly accessible area with wireless internet access
  • A mobile device, like a smartphone, can also act as a “personal hotspot” by creating a wireless network that other devices can connect to using its cellular data connection.
37
Q

IOS

2

A
  • Created by apple for use on Iphone and Ipads
  • Relies on close-sourced code (only used for apple)
38
Q

Android

A
  • Operating system sponsored and created by Google but used by many different providers
  • Offers an open-source code base (offer ability to change look and feel of software)
  • widely available on smartphones and tablets
39
Q

UART

4

A

Universal Asynchronous Receiver-Transmitter
- Device that allows to connect to a device and get information from it
- This is a serial port
- software interface that imitates port

40
Q

Mobile device Connectivity

Wired ways to connect mobile devices

A
  • Lightning Cable
  • USC-C
  • USB 2.0 Micro B
  • USB 2.0 Mini B
  • Serial Cables
41
Q

Port Replicators

A
  • a device that provides a laptop with access to multiple standard computer ports, like USB, HDMI, and Ethernet, etc. by connecting to a single expansion port on the laptop, essentially acting as a hub to expand its connectivity options; it’s similar to a docking station but often uses a more universal connection method like USB-C, allowing it to work with a wider range of laptops.
  • replicates ports (exact features in laptop)
  • In one place where you can easily connect and disconnect things
  • makes life easier by easy access to all ports
  • Single connection to laptop
  • Port mirror
42
Q

Docking Station

3

A
  • Advanced type of port replicator that provides all the capabilities and features of a laptop
  • Also gives new features (i.e. external HDs)
  • Additional ports

December 27th (20 decks)

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