Monitors and Sound Systems

Section 3A

Objectives

List the two most commonly used types of computer monitors.

Explain how a CRT monitor displays images.

Identify two types of flat-panel monitors and explain their differences.

List four characteristics you should consider when comparing monitors.

Explain how a computer outputs sound.

Monitors

Two basic types of monitors◦Cathode ray tube◦Flat-panel display

All monitors are categorized by the way they display color◦Monochrome monitors◦Grayscale monitors◦Color monitors

CRT Monitors

Disadvantage of CRT

• CRT monitors are big and take up desktop space and can be difficult to move.

• CRT monitors require a lot of power to run.

Flat-Panel Monitors

Most common flat-panel monitor is liquid crystal display (LCD)

Disadvantage◦Image can be difficult to see in bright lights◦Limited viewing angle, the angle shrinks as you

increase your angle to the screenMain categories of liquid crystal displays:

◦Passive matrix LCD◦Active matrix LCD

Other Types of Monitors

Paper-White Displays

Electroluminescent (ELD) Displays

Plasma/Gas Plasma Displays

The Video Controller

Video controllers feature their own video RAM or VRAM

Self Check

1. ____________monitors are used for text-only displays where the user does not need to view color graphics.

2. In a monitor, a(n) ___________ aims a beam of electrons at the front of the monitor.

3. A disadvantage of LCD monitors is their limited ____________.

monochrome

Electron gun

Viewing angle

Digital Light Projectors

Digital light projectors replace old fashion slide projectors and overhead projectors

The presentation is projected onto “the big screen” directed from the computer.

Sound Systems