Examining Display Devices

Computer ConceptsUnit B

Examining Display Devices

• Give examples of Output devices:– Monitor, Primary output device– Printer– Speaker– Headphone

Examining Display Devices

• Why are some monitors so much bulkier than others?– They are bulky and big because of the technology

they use.– CRT ( Cathode Ray Tube) monitors

Examining Display Devices

• What are my choices for a monitor?• LCD ( Liquid Crystal Display) screen.• Monitors are also called flat-panel displays• LCD monitors produce an image by manipulating light

within a layer of liquid crystal cells.• Used in Notebook computers• Advantages:

– Display clarity– Low radiation emission– Portability– compactness

Examining Display Devices

• What are my choices for a monitor?• LED ( Light Emitting Diodes) screens.• Looks like LCD.

Examining Input Devices

• What type of screen do handheld devices use??– OLED ( Organic Light Emitting Diodes)– Used in GPSs and cell Phones• Use less power than LCD• Have bright, crisp image and faster response rate than

standard LCD.

– Expensive???– As the technology develops, they are likely to

become less expensive even more popular.

Examining Input Devices

• Why should I care which graphic card is in my computer?– A Graphic Card: contains the circuitry that

generates the signals for displaying an image on the screen.

– The amount of available memory is the key to the overall performance.

– Response rate: is how fast a screen update the information being displayed.

Examining Input Devices

• What determines the best image I’ll get on the screen?– Resolution: the maximum number of horizontal

and vertical pixels that are displayed on the screen.

– Pixel (picture element) is a single point or the smallest unit in a graphic image.

Examining Display Devices

• What determines the best image I’ll get on the screen?• Higher resolution, computer displays a larger work area

with text and another objects smaller.• Try to change your monitor resolution and see the

difference.– 1024 X 768 resolution – 800 X 600 resolution

Examining Display Devices

• What is the typical screen size for a monitor?– Screen size is the measurement in inches from

one corner of the screen diagonally across to the opposite corner.• Monitor screen sizes range from 13” to 24”.

– Viewing angle width: which indicates how far to the side you can still clearly see the screen.• A 170 degree viewing angle is better than a 150 degree

viewing angle

Examining Display Devices

• What is dot pitch?– Dot pitch (dp): is a measure of image clarity.– Not like resolution, it is not customizable.

Examining Display Devices

• Can I customize the color settings for my monitor?

Yes–Color depth or bit depth: the number of colors

that a monitor and graphics card can display.– 24-bit color depth>>> display more than 16 million

colors

Examining Display Devices

• Can I use computer monitor to watch TV?Yes

– If your display system equipped with:–NTSC: National TV Standards Committee

–HDTV: High Definition Television

Thank you

• Questions !!!