Mobile Display Types Flashcards
Mobile Consumption Devices
3
- Smartphones or Tablets
- Consume information and not produce information
- Typically have touchscreens
Touchscreens
2 Types (8 answers)
- 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) - 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
LCD
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.
LED (Back lit)
5
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
OLED
9
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)
Pixel
2
- Picture Element
- Individual point on a screen inside of a display
TFT
3 types
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)
Twisted Nematic (TN)
6
- 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
In-Plane Switching (IPS)
5
- 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
Vertical Alignment (VA)
6
- 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
Contrast Ratio
1
The ratio between the brightest white and the darkest black a display can produce
Back lights
- CCFL
- LED
- Used to light up display panel
Cold Cathode Fluorescent Lamp (CCFL)
3
- 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)
Mobile display Types
3
LCD
LED
OLED
Burn-in
2
- 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
Mobile Device Components
3 types
- Digitizer
- Accelerometer
- Gyroscope
Digitizer
3
- 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)
Haptic Feedback
2
- Vibration when touching a key on a touchscreen keyboard
- Form of touch responsiveness from the display back to the end-user.
Accelerometer
5
- 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)
Gyroscope
6
- 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
Mobile device accessories
8
- Track pads
- Drawing pads
- Touch pens
- Microphones
- Speakers
- Headsets
- Cameras
- Webcams
Track Pad
- Device that can be used to manipulate the cursor on the screen
- two types (Embedded, External (USB))
Drawing Pad
3
- 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
Microphone
- Any device used to record audio or capture voice when making a phone
call
Speakers
1
- Allows you to hear things that are coming out from devices, such as music or videos
Headset
Combines both the microphone and speaker into one device
Digital Camera
1
Provides the ability to capture a live image in a still format
Webcam
Used to record video
Wi-Fi (Wireless Network
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.
Cellular
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.
GSM
6
- 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
CDMA
8
- 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)
PRL
4
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
Bluetooth
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.
NFC
9
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
Hotspot
- 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 (ISP); 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.
IOS
2
- Created by apple for use on Iphone and Ipads
- Relies on close-sourced code (only used for apple)
Android
- 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
UART
4
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
Mobile device Connectivity
Wired ways to connect mobile devices
- Lightning Cable
- USC-C
- USB 2.0 Micro B
- USB 2.0 Mini B
- Serial Cables
Port Replicators
- 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
Docking Station
3
- 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
