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Video and multimedia input/output devices

Unit objectives Describe, install, and troubleshoot

CRT displays Describe, install, and troubleshoot

LCD displays Connect and use speakers and a

microphone Connect and troubleshoot scanners

and digital cameras

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Topic A

Topic A: Cathode ray terminals Topic B: LCDs and other video

technologies Topic C: Sound input and output

devices Topic D: Scanners and cameras

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CRT monitor

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CRT components

Cathode Anode Phosphors Pixel triad Electronic beam positioning

– Shadow mask– Aperture grill– Slotted mask

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How CRTs produce images

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Activity A-1

Examining how CRTs produce images

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CRT characteristics

Screen size Aspect ratio Resolution Refresh rate Dot pitch Flat or curved screen

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Activity A-2

Comparing monitor specifications

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Video connectors Pin Transmits

1 Red video out

2 Green video out

3 Blue video out

4 Monitor ID bit 2

5 Ground

6 Red ground/return

7 Green ground/return

8 Blue ground/return

9 Not used

10 Sync ground/return

11 Monitor ID bit 0

12 Monitor ID bit 1

13 Horizontal sync

14 Vertical sync

15 Monitor ID bit 3

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Display properties

Screen resolution Color quality Monitor settings Color depth

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Display adjustments

Brightness Contrast Position of image on screen Adjustment method varies by monitor

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Activity A-3

Installing a CRT

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CRT issues

Screen is black Image flickers or distorts Noisy monitor Image scrolling Video Display Troubleshooter

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Activity A-4

Troubleshooting CRT problems

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Topic B

Topic A: Cathode ray terminals Topic B: LCDs and other video

technologies Topic C: Sound input and output

devices Topic D: Scanners and cameras

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Flat panel monitor

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LCD advantages

Less power is used Less heat is created Use less desk space Less glare Less radiation emitted

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How a flat panel screen works

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Flat panel monitor characteristics

Screen size Viewing angle Response rate Contrast ratio Native resolution Brightness Other features

– Change orientation– Built-in speakers– Anti-theft lock– Wall mounting

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Flat panel monitor connections

Connection types– 15-pin VGA style connection cable– DVI-D– DVI-I

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DVI-D

Digital-only connection Dual-link contains 24 pins in 3 rows of

8 plus a grounding slot Single-link contains 18 pins

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DVI-D connector

DVI-D connector

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DVI-I

Supports digital and analog signals DVI-I contains 4 additional pins over

DVI-D Extra 4-pins carry analog signals Analog signal pins located above and

below the grounding slot

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TMDS Transition minimized differential

signaling Protocol used to transmit data to

digital monitor No analog conversion Single-link cables use one TDMS

transmitter Dual-link cables use two TDMS

transmitters Supported resolutions

– Single-link up to 1920x1080– Dual-link up to 2048x1596

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Touch screen

Touch-sensitive surface– Pressure-sensitive resistors– Infrared sensors– Electronic capacitors

Uses– PDAs– Point-of-sale terminals– Bank ATMs

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Touch screen input methods

Additional layer with electrical current Capacitors between layers Acoustic waves

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Activity B-1

Examining how LCDs produce images

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Multiple monitors

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Display projectors

Show computer screen to large groups Useful for meetings and classroom Connect using

– VGA– S-Video– Composite– USB– Serial

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DisplayPort technology

New specification developed by VESA Covers

– Displays CRT LCD Plasma Projection

– Connections PCs Game systems DVD players Other image sources

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Activity B-2

Installing an LCD monitor

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LCD monitor issues

Indicator light colors Shaky image Fuzzy image No image Discolored image

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Activity B-3

Troubleshooting LCD problems

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Topic C

Topic A: Cathode ray terminals Topic B: LCDs and other video

technologies Topic C: Sound input and output

devices Topic D: Scanners and cameras

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Speakers connected to a PC

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Speakers connected together

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Activity C-1

Connecting speakers

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Microphone connection to a PC

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Activity C-2

Using a microphone

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Music keyboard connected to ⅛” jack

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MIDI connections

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Activity C-3

Connecting musical instruments to a computer

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Topic D

Topic A: Cathode ray terminals Topic B: LCDs and other video

technologies Topic C: Sound input and output

devices Topic D: Scanners and cameras

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Flatbed scanner

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Multifunction sheetfeed scanner

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Hand-held scanner

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TWAIN

Supported by scanners and imaging applications

“Never the twain shall meet” TWAIN eases scanner connection Most scanners have more full-featured

software from manufacturer

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Scanner configuration features

Image type Scan mode Scan resolution Scaling Destination Image control Preview features Scan

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Scanner connections

Older scanners– Slow parallel ports– SCSI devices

Current scanners– USB – FireWire– All PnP-compliant

Use Device Manager to update driver

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Activity D-1

Connecting a scanner

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Troubleshooting

Acquire information about the problem Simplify by removing any non-critical

components, shut down unnecessary running programs, and disconnect from the Internet or network.

Implement by identifying probable causes and implementing potential solutions one at a time.

Document the error symptoms, the components you removed from the computer, and the solutions you tried and whether they were successful.

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Activity D-2

Troubleshooting scanner problems

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Digital cameras

Connect via USB or FireWire May or may not require drivers Quality of picture expressed in

megapixels Cameras available from 1 megapixel

to over 8 megapixels

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ResolutionsMegapixels Good for Max print size Found in

Under 1 MP Broadcasting over the Internet

Web cameras (webcams)

1 to 2 MP E-mailing pictures 4x6 inches Camera phones, still shot on digital video cameras, older digital cameras

3 to 4 MP Printing, e-mailing, using on Web if you crop image

5x7 inches Mid-range, consumer-grade, digital cameras

5 to 8 MP Large prints 8x10 inches “Prosumer” digital cameras

Over 8 MP Professional use; very large prints

11x14 inches and larger

Prosumer and professional grade digital cameras

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Digital camera memory cards

CompactFlash Memory Stick Secure Digital SmartMedia xD-Picture Card

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Digital camera memory cards (con’t)

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Printing images

No film development costs Store and view photos on computer Print at home Print at store Home prints aren’t same quality as

store

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Digital camera connections

Still cameras - USB Video camera – Firewire Devices run on batteries

– Rechargeable– Disposable– If disposable, use digital-rated

Card readers– Built-in– External device

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Memory card readers

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Activity D-3

Connecting a digital camera

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Camera connection problems

Batteries Cable Camera mode Device manager

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Activity D-4

Troubleshooting digital camera connection problems

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Unit summary Described, installed, and resolved

issues with CRT displays Described, installed, and resolved

issues with LCD displays Connected and used speakers and a

microphone Connected and resolved issues with

digital cameras and scanners