Lesson 14

Maximizing the Use of LCD 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