Huwebes, Oktubre 13, 2016

Lesson 14

MAXIMIZING THE USE OF LCD, LED PROJECTOR

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“Indeed, in no… country have I ever seen a good school without a blackboard, or a successful teacher who did not use it frequently.”

INTRODUCTION
            New technology introduced terms like multimedia, hypermedia, etc. But let us admit that the technology divide is real. Many schools especially in the remote areas especially those who have not been reached by electricity for one reason or another, do not have a computer.

ABSTRACTION

            The Chalkboard
Image result for the chalkboard

The following practices of dedicated professional teachers may help us in the effective use of the chalkboard.

1.    Write clearly and legibly on the board. Take note that there are children in the last rows.
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 of colored chalk to highlight key points.
5.    Do not turn your back to your class while you write on the chalkboard. Write side view as you talk. Don’t lose your eye contact with your class.
6.    For the sake of order and clarity, start to write from the left side of the board going to right.
7.    If you teach the grades and you think the lines on the chalkboard are needed for writing exercise, then provide the lines for your board.
8.    Look at your board work from all corners of the room to test if 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. If you need to replace your chalkboard or if you are having a new classroom with new chalkboard suggest to carpenter to mount the chalkboard a little concave from left to right to avoid glare for the pupils benefit.
11. If you need to have a board work in advance or that need to be saved for tomorrow’s use (say a quiz) , write “Please Save” and cover the same curtain.
12. Make full use of the chalkboard.

Chalkboard Techniques

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A.   Sharpen your chalk to get good line quality.

B.   Stand with your elbow high. Move along as you write.

C.   Use dots as “aiming points”. This keeps writing level.

D.   Make all writing or printing between 2 and 4 inches high for legibility.


E.   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

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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 polysiliconpanels.
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


Image result for 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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