Laptops and Mobile Devices Lesson 002: Display Types Part 1

What are the two main touchscreen interfaces that most mobile devices rely on?

Capacitive Touchscreen and multi-touch.

Capacitive Touchscreen

Detect changes in electrostatic field and support singe touch.

What are the benefit/s of capacitive touchscreens

They are cheap and easy to manufacture.

What are the caveat/s to capacitive touchsreens?

They only support a single touch point at a time, limiting functionality.

Multi-touch Touchsreen

Process multiple contact points simultaneously for advanced gestures.

What does the functionality of multi-touch touchscreens allow?

The use of more advanced features like pinch to zoom.

What are the caveat/s to multi-touch displays?

They are more expensive to manufacture.

Which type of touchscreen interface is most widely used on most smartphones and tablets?

Multi-touch touchscreen due to versatility.

What does LCD stand for?

Liquid Crystal Display.

What does LED stand for?

Light Emitting Diode.

What does OLED stand for?

Organic Light Emitting Diode.

What does Mini-LED stand for?

Mini Light Emitting Diode.

What are the four main display types?

LCD, LED, OLED, and Mini-LED.

Liquid Crystal Display

Uses a liquid crystal material whose properties changed when voltage is applied to enable light to pass through and create the images.

What are LCDs made up of?

Pixels.

What is another word for what LCDs are made up of other than pixels?

Picture elements.

What do pixels contain?

Subpixels for red, green, and blue colors known as RGB.

What determines the resolution of LCD displays?

The number of pixels in the display.

What does PPI stand for?

Pixels per inch.

How are sharper images made possible in LCD displays?

By having more PPI.

What makes an LCD display visible to end users?

A backlight behind every panel, which illuminates the liquid crystal material.

What does CCFL stand for?

Cold Cathode Flourescent Lamp.

What does the backlight in a LCD use for illumination?

A CCFL.

What does a CCFL require for operation?

An inverter to convert the DC power from the battery into the required AC needed for power supply.

Light Emitting Diode Display

Uses an LED backlight and are more energy efficient, thinner and lighter in weight than LCD displays.

Besides the use of different backlights, what kind of display functions the same as an LED display?

An LCD display.

What type of current do LED displays use for power supply?

DC.

What contributes to LED displays being thinner than LCD displays?

There is no need for a current transformer turning DC into AC.