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Module 1.2: Output Devices
May 29, 2024
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Module 1.2: Output Devices
Types of Output Devices
Visual Output
Soft Copy
Hard Copy
Sound Output
Touch Output
Other Outputs
Display Devices
Benefits
Immediate feedback
Interaction between user and computer
Easily changeable/updated content
Enlarged text for visually impaired users
Drawbacks
Not permanent
Difficult to share (unless large monitor or data projector)
Can cause eye strain
Lack of privacy
High replacement cost for expensive monitors
Factors to Consider When Choosing a Display Device
Resolution
Number of pixels (horizontal x vertical)
Higher resolution = better picture quality
Aspect Ratio
Width of display in relation to height
Common formats: widescreen, letterbox
Contrast Ratio
Ratio of brightest color to darkest color
Response Time
Time for a pixel to change (measured in milliseconds)
Ports
HDMI (video and audio)
VGA (video only)
Printers
Types
Color Laser Printers
More reliable, easier to maintain
Better for black and white, bulk printing
Higher initial cost but cheaper long-term
Inkjet Printers
Cheaper initial cost
Better for photo quality
Higher long-term cost
3D Printers
Create physical 3D objects using modeling software
Features: filament, print head, bolt plate
Advantages & Disadvantages
Faster production, cost-effective, quality control, unlimited design
High electricity use, high purchase cost, special material required, potential for misuse
Wireless Technology in Output Devices
Wi-Fi, Bluetooth, NFC
Enables wireless printing, video, sound
Interactive Whiteboards
Advantages
Write on the board and save notes
Better interaction and participation
Use various multimedia formats
Disadvantages
Requires dim lighting
May be difficult to read and use
High cost and maintenance
Teachers’ reluctance to adopt new technology
Drivers
Definition
: Software that allows a computer to communicate with hardware devices
Plug and Play
Automatically detects and configures devices
Input and Output for Physically Challenged Users
Visually Impaired
Braille Keyboard and Display
Magnification Devices
Large Key Keyboards
Braille Printers
Hearing Impaired
On-screen notices, flashing screens
Vibration devices
Increased volume for hearing impaired (not for deaf)
Motor Control
Eye tracking, head movement devices
Large keyboards, track balls, joysticks
Examples: Puff-suck switch, foot mouse
Health Issues Related to Input and Output Devices
Poor posture and prolonged usage can cause:
Sore neck, backache, headaches, repetitive strain injury (RSI)
Suggestions
Sit with proper back support
Use height-adjustable desks
Take breaks and move around
Avoid high headphone volume
Adjust monitor settings to reduce eye strain
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