901 - 3.0 Mobile Devices

3.2 Explain the function of components within the display of a laptop

Type

LCD P.686

TN vs IPS P.686

Fluorescent vs. LED backlighting P.689-690

OLED - organic light-emitting diode P.936

WIFI antenna connector/placement

3.4 Explain the characteristics of various types of other mobile devices

Tablets

Smartphones

Very similar to smartphones (like large smartphones --> without the phone.

Run the same OSs and apps

Use the same multi-touch screens

Lights the screen with an organic of compound

Use less electricity than LCSs

Screens larger than half a dozen iches

Disadv

  1. Too expensive to make for mainstream consumer devices
  2. Don't use backlights at all - can display true black

Apps for performing the same task

Get less obvious over time than single-purpose devices

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Twisted Nematic (TN) use thin film transistor (TFT) (active matrix technology ) to display

In-Plane Switching (IPS) P.689

Create a wider viewing angle and far better color re-creation than TN panels can provide

Used for graphic professionals

  1. 6 bits display - red, green, and blue
  2. 18 bit display will not reproduce the full 24-bit true color

Manufactures use many types of IPS technology to find the right mix of price-to-performance.

LCD Monitors with CCFL backlights

Cold cathode fluorescent lam(CCFL)

Low power use

Brightness

Long life

LED Monitor

Light-emitting diode (LED)

Use AC power, but given the transformer converts the
AC power--> DC power

Disadv --> costs a lot more than the edge types

The edge type function similarly to a CCFL-style display

Reduces the overall electricity usage

  1. (X) use AC power
    1. outstanding contrast and color

Disadv

  1. Panel fudges a little bit when asked to do something it can't do
  2. This can produce noticeable problems with reproduction

Reduces the thickness of the panel
Used for many smaller devices such as smartphones and tablets