Maximizing the use
of LCD, LED projector and the CHALKBOARD
The Chalkboard
Except in extremely deprived classrooms, every classroom has
a chalkboard. In fact, a school may have no computer, radio, TV, etc. but it
will always have a chalkboard.
Following
Practices of using Chalkboard
1. Write
clearly and legibly on the board.
2. It helps if
you have a hard copy of your chalkboard diagram or outline.
3. Don’t crowd
your notes on the board.
4. Make use
colored chalk to highlight key points.
5. Do not turn
your back to your class while you write on the chalkboard.
6. For the
sake of order and clarity, start to write from the left side of the board going right.
7. If you
teach the Grades and you think the lines on the chalkboard are needed for
writing exercises.
8. Look at
your board work from all corners of the room to test if the pupils from all
sides of the room can read your board work.
9. If there is
glare on the chalkboard at certain times of the day , a curtain on the window
may solve the problem.
10. Make full use
of the chalkboard.
CHALKBOARD
TECHNIQUES
ü Sharpen
your chalk to get good line quality.
ü Use dots “aiming
points “. This keeps writing level.
ü Make all
writing or printing between 2 or 4 inches high for legibility.
ü Stand with
your elbow high, move along as you write.
ü When using
colored chalk, use soft chalk so that it can be erased easily.
PROJECTOR
A projector is a device that uses light and lenses to take an
image and project a magnified image onto a larger screen or wall.
The LCD
Projector
LCD (Liquid Crystal Display) is a thin , flat panel used for
electronically displaying information such as text, images and moving picture.
Its uses include monitor for Computers, Televisions , Instrument panels Gaming
devices etc. Using polarization of lights to display objects.
Gene
Dolgoff – is credited with developing the LCD projector.
To display images, LCD (liquid-crystal display) projectors
typically send light from a metal-halide lamp through a prism or series of
dichroic filters that separates light to three polysilicon panels.
As polarized light passes through the panels (combination of
polarizer, LCD panel and analyzer), individual pixels can be opened to allow
light to pass or closed to block the light.
The LED
Projector
Instead of a traditional halogen lamp, they use
(light-emitting diodes), which are more environmentally friendly and longer
lasting. LED projectors use either DLP technology, replacing the color wheel
and white-light lamp with red, blue, and green LEDS, or LCoS technology, which
is found in handheld projectors.
Light-emitting diode projectors represent a significant
advance over traditional projectors. Instead of using a bulb filled with gas at
high pressure, they use an array of LEDs to generate the light that shines
through, the image element to project an image.
ADVANTAGES
OF USING PROJECTOR
·
Largest possible picture
·
Smaller images a great option also
·
Low cost
·
Space saving
·
Easy to install
LIMITATIONS
IN USING PROJECTOR
·
Dark room often required
·
Maintenance required
·
Installation can be more involved
·
Separate audio system required
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