Output devices are tools that display the results of computer processing in a human-understandable format (either on paper or on monitor). Some are part of control systems.
Types of Monitors
1. Cathode Ray Tube (CRT) Monitor
Overview: An older type of monitor that is becoming rare. Utilizes an electron gun firing against a phosphorus screen.
Advantages:
Wider viewing angles compared to most LCDs.
Supports light pen use in applications like CAD.
Disadvantages:
Heavy and can pose a risk if not supported properly.
Generates significant heat.
Higher power consumption.
Flickering can lead to eye strain.
Uses:
Specialized fields such as computer-aided design (CAD).
2. Liquid Crystal Display (LCD)
Overview: Made of liquid crystals with a matrix of pixels.
Advantages:
Low power consumption, lightweight, and available in various sizes.
Sharp image resolution with a wide color range.
No flickering, unlike CRTs.
Disadvantages:
Inconsistent color and contrast at various angles.
Common issues with motion blur and potential for dead pixels.
Additional Technologies
Light Emitting Diodes (LED): Used for backlighting in LCDs; provides better brightness and color contrast.
Cold Cathode Fluorescent Lamps (CCFL): Older backlighting technology, now largely replaced by LEDs.
Organic Light Emitting Diode (OLED): A more advanced screen technology with potential benefits over LCD.
Uses of LCD Screens
Common in modern computers, touch-screen devices, mobile phones, tablets, tablets, and portable gaming systems.
Comparison of CRT and LCD
CRTs are being phased out in favor of LCD due to efficiency and better image quality.
While CRTs support older applications like light pens, LCDs offer modern capabilities with lower power consumption and better image quality.