Monitor and Printer: Definition, Types, Functions and Uses

Monitor and Printer

Monitor and printer are two commonly used output devices. They receive processed data from a computer and present it in a form that users can understand.

A monitor displays information electronically on a screen.
A printer produces a physical copy of information on paper or another material.

A monitor produces soft copy output, while a printer normally produces hard copy output.

What Is a Monitor?

A monitor is an output device that displays text, images, videos and graphical information produced by a computer.

It is also known as:

Display
Computer screen
Visual Display Unit
VDU

A monitor allows users to see:

Operating-system interfaces
Documents
Websites
Applications
Images
Videos
Games
Processing results
System messages

Modern monitors can connect to desktop computers, laptops, gaming consoles, security systems and other digital devices.

How Does a Monitor Work?

A monitor receives visual information from the computer’s graphics system.

The basic process is:

The CPU processes data and instructions.
The graphics processor prepares the visual output.
The image information is sent to the monitor through a display connection.
The monitor’s controller interprets the signal.
Millions of pixels produce the required colours and brightness.
The complete image appears on the screen.

This process is repeated many times every second to produce smooth movement and video.

What Is a Pixel?

A pixel is the smallest controllable element of a digital display.

The word pixel comes from picture element.

Most colour pixels contain red, green and blue subpixels:

Red
Green
Blue

By changing the brightness of these subpixels, the monitor can create millions or billions of different colours.

A display containing more pixels can show greater image detail, provided the screen, content and graphics hardware support the resolution.

Main Components of a Monitor

Display Panel

The display panel contains the pixels that create the image.

Backlight

LCD monitors require a backlight to illuminate the pixels.

Older LCD monitors commonly used fluorescent backlights, while modern LCD monitors generally use LED backlights.

OLED monitors do not require a separate backlight because each pixel produces its own light.

Display Controller

The display controller receives the video signal and controls how the image appears on the panel.

Input Ports

Input ports connect the monitor to a computer or another device.

Common ports include:

HDMI
DisplayPort
USB-C
DVI
VGA

Power Supply

The power supply provides electricity to the monitor’s internal components.

Stand

The stand supports the monitor. Some stands allow users to adjust:

Height
Tilt
Rotation
Swivel

Control Buttons

Monitor buttons or a joystick open the on-screen display menu.

The menu may control:

Brightness
Contrast
Colour mode
Input source
Audio
Power settings

Types of Monitor

CRT Monitor

CRT stands for Cathode-Ray Tube.

A CRT monitor uses an electron beam and phosphor-coated screen to create images.

CRT monitors are:

Large
Heavy
Power-consuming
Deep in physical size

They were widely used with older computers but have largely been replaced by flat-panel displays.

LCD Monitor

LCD stands for Liquid Crystal Display.

An LCD monitor uses liquid crystals to control the light passing through its pixels.

LCD monitors are:

Thin
Lightweight
Energy-efficient
Commonly used in laptops and desktop displays

The liquid crystals do not produce their own light, so an LCD requires a backlight.

LED Monitor

An LED monitor is normally an LCD monitor that uses Light-Emitting Diodes for its backlight.

Therefore, most products called “LED monitors” are actually LED-backlit LCD monitors.

Compared with older fluorescent-backlit LCDs, LED-backlit monitors can provide:

Lower power consumption
Thinner designs
Better brightness
Improved contrast
Longer backlight life

OLED Monitor

OLED stands for Organic Light-Emitting Diode.

In an OLED display, each pixel produces its own light. A separate backlight is not required.

OLED monitors can provide:

Deep black levels
High contrast
Fast pixel response
Wide viewing angles
Excellent image quality

Possible limitations include:

Higher cost
Risk of image retention or burn-in
Different brightness characteristics
Organic material ageing over time

Mini-LED Monitor

A Mini-LED monitor is an LCD that uses a backlight made from many small LEDs.

The backlight can be divided into multiple dimming zones, allowing better brightness and contrast than a basic LED-backlit LCD.

Mini-LED is a backlight technology and should not be confused with OLED.

Touchscreen Monitor

A touchscreen monitor displays information and also detects touch input.

It is both:

An output device because it displays information
An input device because it receives touch commands

Touchscreen monitors are commonly used in:

ATMs
Kiosks
Point-of-sale systems
Classrooms
Medical systems
Industrial systems

Common LCD Panel Types

TN Panel

TN stands for Twisted Nematic.

TN panels are known for:

Fast response
Affordable prices
High refresh-rate options
Lower colour and viewing-angle performance on many models

They are commonly used in budget and competitive gaming monitors.

IPS Panel

IPS stands for In-Plane Switching.

IPS panels generally provide:

Good colour reproduction
Wide viewing angles
Consistent image quality
Suitable performance for general use and creative work

VA Panel

VA stands for Vertical Alignment.

VA panels generally provide:

High contrast
Deep black levels for an LCD
Good image quality
Viewing angles and response performance that vary by model

Different monitors using the same panel category can still have different quality and performance.

Important Monitor Specifications

Screen Size

Monitor size is measured diagonally from one corner of the visible screen to the opposite corner.

Common sizes include:

22 inches
24 inches
27 inches
32 inches
34 inches and larger

A larger screen does not automatically provide a sharper image. Resolution and viewing distance also matter.

Resolution

Resolution describes the number of horizontal and vertical pixels on a display.

Common resolutions include:

Resolution Name	Pixel Dimensions
HD	1280 × 720
Full HD	1920 × 1080
QHD	2560 × 1440
4K UHD	3840 × 2160
8K UHD	7680 × 4320

A higher resolution can provide more detail and workspace, but it may require more powerful graphics hardware.

Aspect Ratio

Aspect ratio describes the relationship between the screen’s width and height.

Common aspect ratios include:

16:9: Standard widescreen format
16:10: Provides slightly more vertical space
21:9: Common on ultrawide monitors
32:9: Used by super-ultrawide monitors
4:3: Common on older monitors

Refresh Rate

Refresh rate describes how many times the monitor updates its image every second.

It is measured in hertz, or Hz.

Common refresh rates include:

60 Hz
75 Hz
120 Hz
144 Hz
165 Hz
240 Hz

A higher refresh rate can produce smoother motion when the computer sends enough frames and the application supports it.

Response Time

Response time describes how quickly a pixel changes from one state or colour to another.

A faster response can reduce visible blur or ghosting during movement. Manufacturer response-time measurements can use different testing methods, so numbers are not always directly comparable.

Brightness

Monitor brightness is commonly measured in nits.

A brighter display may be useful in well-lit rooms and for supported high-dynamic-range content.

Contrast Ratio

Contrast ratio describes the difference between the darkest and brightest parts of an image.

A higher effective contrast ratio can produce deeper blacks and more visible detail.

Colour Accuracy

Colour accuracy describes how closely the monitor reproduces the intended colours.

It is important for:

Photo editing
Video editing
Graphic design
Printing workflows
Digital art

Viewing Angle

Viewing angle describes how far a user can move to the side or above the screen before colours and brightness change significantly.

HDR

HDR stands for High Dynamic Range.

HDR can provide a wider range of brightness and colour when the monitor, content, operating system and software all support compatible HDR formats.

An HDR label alone does not guarantee excellent HDR quality. Brightness, contrast, colour range and local dimming also matter.

Monitor Connection Types

VGA

VGA is an older analogue video connection.

It does not normally carry audio and provides lower quality than modern digital connections.

DVI

DVI is an older digital or analogue display connection, depending on its type.

It was commonly used before HDMI and DisplayPort became widespread.

HDMI

HDMI carries digital video and audio through a single cable.

It is commonly used with:

Monitors
Televisions
Laptops
Gaming consoles
Projectors

DisplayPort

DisplayPort is a digital display connection commonly used with computers and high-performance monitors.

Different versions support different combinations of resolution, refresh rate and additional features.

USB-C

A compatible USB-C connection can carry:

Video
Audio
Data
Power

However, not every USB-C port supports video output or the same charging capability. Device specifications should be checked.

Uses of a Monitor

A monitor is used for:

Viewing documents
Browsing websites
Watching videos
Playing games
Programming
Graphic design
Photo and video editing
Monitoring security cameras
Displaying medical information
Controlling industrial systems
Online learning and communication

Advantages of a Monitor

Displays information immediately
Supports text, images and video
Allows users to interact with graphical interfaces
Produces no paper waste for normal viewing
Can display changing and animated content
Available in many sizes and resolutions
Supports multiple applications on one screen
Can be used repeatedly without producing a new physical copy

Limitations of a Monitor

Requires electrical power
Does not create a physical copy
Long periods of use may cause eye discomfort
High-quality monitors can be expensive
Screens can be damaged physically
Colour and image quality vary by model
Incorrect settings may reduce visual comfort

What Is a Printer?

A printer is an output device that produces a physical copy of digital information on paper or another material.

The physical result produced by a printer is called a hard copy.

Printers can produce:

Text documents
Photographs
Charts
Labels
Receipts
Posters
Technical drawings
Identification cards
Three-dimensional objects

How Does a Printer Work?

The printing process generally includes the following steps:

The user selects the print command.
The application sends the document to the operating system.
A printer driver converts the document into instructions the printer understands.
The print job may be placed in a print queue.
The printer receives the data.
The printer places ink, toner or another material in the required positions.
The finished output is produced.

The exact process depends on the type of printer.

What Is a Printer Driver?

A printer driver is software that allows the operating system and applications to communicate with a printer.

It converts document information into printer-specific commands.

Without a compatible driver, some printer features may not work correctly.

What Is a Print Queue?

A print queue is a temporary list of documents waiting to be printed.

The print queue allows users to:

View pending print jobs
Pause printing
Cancel a document
Change the printing order
Identify printing errors

Types of Printer

Printers can be divided into two main categories:

Impact printers
Non-impact printers

Impact Printers

Impact printers produce output by physically striking an inked ribbon against paper.

They are generally:

Noisy
Mechanically complex
Suitable for multi-part forms
Lower in print quality than many modern printers

Dot Matrix Printer

A dot matrix printer uses a print head containing small pins.

The pins strike an inked ribbon and create characters or images using patterns of dots.

Dot matrix printers are commonly used for:

Multi-part forms
Invoices
Delivery documents
Industrial environments
Continuous paper printing

Advantages of Dot Matrix Printers

Can print through carbon-copy forms
Low running cost in some environments
Durable
Suitable for continuous paper

Limitations of Dot Matrix Printers

Noisy
Low print quality
Slow
Limited colour capability

Daisy Wheel Printer

A daisy wheel printer uses a rotating wheel containing characters.

A hammer strikes the selected character against an inked ribbon and paper.

It can produce clear text but cannot efficiently print complex graphics. It is now largely obsolete.

Line Printer

A line printer prints an entire line or multiple characters at once.

It was commonly used for high-volume business and mainframe printing.

Non-Impact Printers

Non-impact printers produce output without striking an inked ribbon against the paper.

They are generally quieter and can produce higher-quality text and images.

Common non-impact printers include:

Inkjet printer
Laser printer
Thermal printer
Dye-sublimation printer
3D printer

Inkjet Printer

An inkjet printer sprays tiny droplets of liquid ink onto paper.

It may use separate cartridges or refillable ink tanks.

Inkjet printers are commonly used for:

Home documents
Colour printing
Photographs
School projects
Small-office work

How Does an Inkjet Printer Work?

The paper enters the printer.
The print head moves across the page.
Tiny nozzles place ink droplets in selected positions.
The paper moves forward.
The process repeats until the page is complete.

Advantages of Inkjet Printers

Good colour and photo printing
Affordable purchase price for many models
Compact size
Can print on different paper types
Suitable for home use

Limitations of Inkjet Printers

Ink can be expensive
Print heads may become blocked
Ink may dry when the printer is unused
Printing can be slower than a laser printer
Some prints can smudge or fade depending on ink and paper

Laser Printer

A laser printer uses toner powder, an imaging drum, electrical charges and heat to produce output.

It is commonly used in:

Offices
Schools
Libraries
Businesses
High-volume printing environments

How Does a Laser Printer Work?

The printer prepares the page data.
An electrical charge is applied to a photosensitive drum.
A laser creates the image pattern on the drum.
Toner attaches to the required areas.
The toner is transferred onto the paper.
Heated rollers fuse the toner permanently onto the paper.
The printed page exits the printer.

Advantages of Laser Printers

Fast document printing
Sharp text quality
Suitable for high-volume use
Toner does not dry like liquid ink
Often provides a lower cost per page for frequent document printing

Limitations of Laser Printers

Higher initial cost
Larger physical size on many models
Replacement toner and parts can be expensive
Photo quality may not match a specialised photo inkjet
The fuser becomes very hot during operation

Thermal Printer

A thermal printer uses heat to produce output.

Direct Thermal Printer

A direct thermal printer applies heat to specially coated paper. It does not require ink or toner.

It is commonly used for:

Receipts
Tickets
Shipping labels
Portable printing

Direct thermal prints may fade when exposed to heat, sunlight or certain chemicals.

Thermal Transfer Printer

A thermal transfer printer uses heat to transfer material from a ribbon onto the printing surface.

It can produce durable labels for warehouses, manufacturing and product tracking.

Dye-Sublimation Printer

A dye-sublimation printer uses heat to transfer dye onto paper or another suitable material.

It can provide smooth colour transitions and high-quality photographic output.

It is commonly used for:

Photo printing
Identification cards
Event photography
Specialised product printing

3D Printer

A 3D printer creates physical three-dimensional objects from a digital model.

It generally adds material in layers until the object is complete.

3D printers are used in:

Product design
Engineering
Education
Healthcare
Architecture
Manufacturing
Prototyping

A 3D printer is an output device, but it produces physical objects instead of traditional printed pages.

Multifunction Printer

A multifunction printer combines several devices in one machine.

It may include:

Printer
Scanner
Photocopier
Fax machine

A multifunction printer performs both input and output functions because it scans documents and produces printed copies.

Important Printer Specifications

Print Resolution

Printer resolution is commonly measured in DPI, meaning Dots Per Inch.

A higher DPI can provide more detail, but print quality also depends on:

Printing technology
Ink or toner
Paper quality
Image quality
Printer settings

DPI values from different printer technologies are not always directly comparable.

Printing Speed

Printing speed is commonly measured in:

PPM: Pages Per Minute
IPM: Images Per Minute

Actual speed depends on colour mode, print quality, paper type and document complexity.

Duplex Printing

Duplex printing means printing on both sides of a sheet.

Automatic duplex printing turns or routes the paper automatically.

Duty Cycle

Duty cycle describes the number of pages a printer is designed to handle within a specified period, usually a month.

The recommended monthly print volume may be lower than the maximum duty-cycle number.

Cost per Page

Cost per page includes the cost of:

Ink or toner
Drum units
Maintenance parts
Paper

A printer with a low purchase price may have a high running cost.

Paper Handling

Paper-handling features include:

Supported paper sizes
Paper-tray capacity
Automatic Document Feeder
Manual-feed slot
Envelope support
Photo-paper support
Card printing

Printer Connection Types

USB

USB provides a direct wired connection between the printer and computer.

Wi-Fi

Wi-Fi allows devices to print wirelessly through a local network or supported direct connection.

Ethernet

Ethernet connects a printer to a wired network. It is commonly used in offices and shared environments.

Bluetooth

Some portable printers support Bluetooth connections.

Cloud and Mobile Printing

Supported printers may receive print jobs from smartphones, tablets or authorised online services.

Security settings should be configured before allowing network printing.

Uses of a Printer

A printer is used for:

Printing documents
Producing photographs
Creating receipts
Printing labels and barcodes
Producing educational materials
Printing forms and invoices
Creating posters
Producing technical drawings
Printing identification cards
Creating physical 3D models

Advantages of a Printer

Produces physical copies
Allows offline reading
Useful for official documents
Supports signatures and paper forms
Can produce photographs and labels
Makes information easy to distribute
Different printer types support different materials
Printed information does not require a screen or electricity to read

Limitations of a Printer

Requires paper or another material
Uses ink, toner, ribbon or filament
Creates ongoing operating costs
Can produce paper waste
Requires maintenance
May experience paper jams
Printed information is harder to update
Physical documents require storage space

Difference Between Monitor and Printer

Feature	Monitor	Printer
Device Category	Output device	Output device
Output Type	Soft copy	Hard copy
Output Material	Electronic display	Paper or physical material
Main Content	Text, images, video and animation	Text, images and physical objects
Power Required to View Output	Yes	No, after normal paper printing
Output Can Change Instantly	Yes	No
Common Measurement	Resolution, refresh rate and screen size	DPI, PPM and cost per page
Main Consumables	Usually none during normal viewing	Paper, ink, toner, ribbon or filament
Common Uses	Viewing and interacting with digital content	Producing physical records and copies

Soft Copy vs Hard Copy

Soft Copy

A soft copy is an electronic version of information.

Examples include:

Document displayed on a monitor
Digital PDF file
Image shown on a screen
Online web page

A soft copy can be edited, copied and shared electronically.

Hard Copy

A hard copy is a physical version of information.

Examples include:

Printed document
Printed photograph
Paper receipt
Printed certificate

A hard copy can be used without a computer screen but requires physical storage space.

How Monitor and Printer Work Together

A monitor and printer can be used together when creating a document.

For example:

The document is created using a computer.
It appears on the monitor as a soft copy.
The user checks and edits the document.
The print command sends the document to the printer.
The printer produces a hard copy.

The monitor allows the user to preview the information before printing it.

How to Choose a Monitor

Consider the following factors:

Screen size
Resolution
Panel type
Refresh rate
Response time
Colour accuracy
Brightness
Available ports
Stand adjustments
Computer compatibility
Intended use
Budget

For example:

Office users may prioritise text clarity and comfort.
Gamers may prioritise refresh rate and response performance.
Designers may prioritise colour accuracy and resolution.

How to Choose a Printer

Consider the following factors:

Colour or monochrome printing
Monthly print volume
Inkjet or laser technology
Print speed
Print quality
Automatic duplex printing
Scanner requirement
Wi-Fi or network support
Paper sizes
Ink or toner cost
Cost per page
Available space

A low-cost printer may become expensive if its cartridges have a high cost per page.

Monitor Safety and Maintenance

Keep the screen clean using a suitable soft cloth.
Do not spray liquid directly onto the display.
Use suitable brightness for the room.
Position the monitor at a comfortable height and distance.
Take regular breaks during extended use.
Keep ventilation openings clear.
Protect the screen from pressure and impact.
Use supported cables and power adapters.

Printer Safety and Maintenance

Use supported paper and consumables.
Remove paper jams carefully.
Do not touch a laser printer’s hot fuser area.
Keep ink nozzles and print heads clean.
Do not force paper through the printer.
Keep the printer dry and well ventilated.
Update printer software when required.
Recycle cartridges and electronic parts responsibly.
Keep toner powder away from the eyes and mouth.
Disconnect power before performing maintenance not designed for normal users.

Frequently Asked Questions

Is a monitor an input or output device?

A standard monitor is an output device because it displays information from the computer. A touchscreen monitor performs both input and output functions.

Is a printer an input or output device?

A printer is an output device because it produces a physical copy of computer information.

What is the main function of a monitor?

The main function of a monitor is to display text, images, videos and graphical information.

What is the main function of a printer?

The main function of a printer is to produce a hard copy of digital information.

What is the difference between LCD and LED monitors?

An LCD uses liquid crystals to create an image. A product described as an LED monitor is normally an LCD that uses LEDs for its backlight.

What is monitor resolution?

Monitor resolution is the number of horizontal and vertical pixels on the display, such as 1920 × 1080.

What does refresh rate mean?

Refresh rate is the number of times a monitor updates its image each second. It is measured in hertz.

Which is better, an inkjet or laser printer?

An inkjet printer is often suitable for colour photographs and occasional home use. A laser printer is commonly better for fast, high-volume document printing.

What is printer DPI?

Printer DPI means Dots Per Inch. It is one measurement related to the amount of detail a printer can produce.

What is a multifunction printer?

A multifunction printer combines printing with functions such as scanning, copying and sometimes faxing.

What is the difference between soft copy and hard copy?

A soft copy is displayed or stored electronically, while a hard copy is printed on paper or produced as another physical output.

Conclusion

Monitor and printer are important output devices that present computer information in different forms.

A monitor displays text, images and video electronically as a soft copy. Its important features include resolution, screen size, panel type and refresh rate.

A printer produces a physical hard copy using ink, toner, heat, impact or other materials. Common printer types include inkjet, laser, thermal, dot matrix and 3D printers.

In simple words:

A monitor shows information on a screen.
A printer produces information in a physical form.