LCD Projectors and Document Cameras Defined

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LCD Projectors and Document Cameras Defined

• Or everything you wanted to know but didnt know
  who to ask . . .

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Projectors- Two main types

• Digital Light Processing (DLP)
• Reflect light again hundreds of tiny mirrors
  called digital micro devices (DMD)
• Each mirror represents one pixel
• Liquid Crystal Display (LCD)
• Operates by shining light through transparent
  red, green and blue LCD cells
• Typically brighter than DLP projectors with the
  same lumens

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Does Size Really Matter?

• Ultralights - used for traveling presentation
• Weigh under 3 lbs.
• Typically 1000 - 2500 lumens
• Room Projectors
• Weigh in at 8 - 25 lbs
• Brighter than ultralights, 2500 - 5000 lumens
• Fixed Projectors
• Most expensive
• Usually in Auditoriums
• Range from 1000 - 10,000 lumens

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Resolving the Resolution Issue

• Each projector has its own native resolution at
  which it works best
• For best projection - set the computer and the
  projector at the same display setting
• the most popular today being the XGA 1024 x 768
  sold in the 43 aspect ratio

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Projector Resolution Options
Resolution Description
SVGA 800 x 600 Great for those on a tight budget. Theyre good for PowerPoint presentations that include clip art or line drawing, black and white, showing documents, etc. They are not good for presentations that require a lot of detail or video.
XGA 1,024 x 768 Most computers still output in native XGA, so matching an XGA projector to your computer ensures you won't lose any detail. These are good general purpose projectors.
SXGA 1,280 x 1,024 SXGA projectors are high resolution, and will be more expensive than XGA. These are targeted for high end personal computer users.
SXGA 1,400 x 1,050 SXGA projectors are becoming more popular, and there are several offerings available in both budget and high-end configurations. These are very good for detailed photography and graphics.
UXGA 1,600 x 1,200 UXGA is for very high end high resolution workstation applications that require exacting detail. These are expensive projectors that support a broad range of computer equipment.
The most popular projector resolution The most popular projector resolution
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Is what you see what you get?

• 4 Factors Determine Image Quality
• Contrast
• Color
• Brightness
• Illumination spread

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Contrast and Color

• Difference between white black
• Most important when projecting video
• Contrast ratio 2501 minumum - 20001 great!
• More colors the better - especially for video
• Should be able to display 16 million colors or
  more

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Brightness and Illumination

• Brightness indicated by ANSI Lumens
• Minimum 2500 Lumens for a classroom
• Illumination spread - is the image the same
  brightness from top to bottom and side to side
• 85 illumination uniformity or better

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Let the Light Shine!

• Projector Lamps come in 3 main types
• UHP - Ultra High Performance
• UHE - Ultra High Efficiency - most common
• Metal Halide
• Lamp life - 1000 - 4000 hours
• Lamp Cost - 300 - 600
• Include an extra lamp in the cost of the projector

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Conveniences (Extras)

• Wireless Projector
• Networked connections - remotely controlled
• Component video inputs for higher quality video
• Digital Keystone correction
• Wireless mouse control
• Dual computer input

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Document Cameras

• Resolution
• Two categories - low resolution output
  (composite and/or S-video) and those with
  high-resolution output (1024x768 or higher).
• Refresh Rate
• 20 to 30 Frames per second
• Zoom Lens
• Features
• Size

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Common Features

• Zoom 4 to 16x zoom
• Pan
• Auto Focus
• Capture images - single or timed continuous
• Playback images - view saved images
• Freeze image - irregular shaped object
• Brightness
• Remote control

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Bells and Whistles

• Effects - change from color to black and white or
  negative
• Timer - time the image on the screen - countdown
• Reverse Image
• Mirror Image
• Night view - lower the frame rate
• Download captured images
• Optional microscope connections
• Optional Interactive whiteboard connections

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More Bells and Whistles

• Split Screen view - view both live and captured
  image
• Picture in picture - view thumbnail of a saved
  image with the live image in the background
• Presenter view - shaded exterior with clear view
  inside area

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Why Should I Use One?

• How can they be used?
• Case Studies
• Using Document Cameras in the Elementary
  Classroom
• Document Cameras in the classroom
• More Classroom Uses
• More Case Studies

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Web Resources

• 6 Things You Need to Know about Document Cameras
• LCD Projector Guide