Both types of projector use a bright lamp that shines through the material to be projected and is usually cooled by a fan. In an overhead projector, the
light shines through a glass on which you place a translucent slide
. Data projectors have panels that display image signals sent from a computer or other video device.
What is difference between overhead projector and LCD projector?
LCD (liquid crystal display) projectors are
as different from overhead
and opaque projectors as a spaceship is different from a car. … In general, because LCD projectors are much more sophisticated than overhead projectors, their price points are usually higher.
What is a data projector?
A
device that projects computer output onto a
white or silver fabric screen that is wall, ceiling or tripod mounted. It is widely used in classrooms and auditoriums for instruction and slide presentations. … A data projector has HDMI inputs for Blu-ray/DVD players, set-top boxes and computers.
When would you use an overhead projector?
The OHP, like the slide projector, is used
for showing prepared illustrations on a screen
, but with the advantage over the projector that the illustrations can be manipulated while they are being projected. The transparencies may be produced locally or purchased commercially.
What is an overhead projector What is it used for?
An overhead projector (OHP), like a film or slide projector, uses
light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience
.
What are the disadvantages of a projector?
- A dark room is very often required to use a
projector
. - It requires maintenance on regular intervals.
- Installation Cost can be more in some cases as it depends upon how you get it installed.
- Most of the
projectors
need a separate audio system.
What is the advantage of data projector?
Compared to previous projection technologies and other ways of presenting information, a data projector has several distinct advantages — including
the ability to easily manipulate and update information, flexibility, portability and easy integration with multimedia and online content
.
What are the disadvantages of overhead projector?
- Resolution Problems. In order for a large classroom to see items clearly, the overhead projector needs to be at the perfect distance and angle. …
- Cost to Replace Bulbs. …
- Transportation. …
- Displaying Material. …
- Outdated Technology.
What are the main parts of overhead projector?
- Lamp and Box. The largest part of an overhead projector is the box at its base. …
- Fresnel Lens and Plate Glass. …
- Upper Lens Assembly. …
- Projection Media.
Are overhead projectors still used?
“Most classrooms have projectors on the ceiling that display whatever is on the teacher’s computer onto the wall,” Marquez said. “As far as the overhead projector where the teacher would roll it out on the cart and display transparent sheets of the lesson, that
definitely no longer exists
.”
What should be avoided when using the overhead projector?
- “Chalkboarding”
- Pointing for emphasis.
- Highlighting.
- Progressive disclosure with opaque cover.
- Overlays.
What are overhead projector sheets called?
A transparency, also known variously as a viewfoil, foil, or viewgraph
, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn. These are then placed on an overhead projector for display to an audience.
How does an overhead projector work?
An overhead projector uses a
converging lens and a mirror to project a real image of your transparency onto a screen
. … This lens bends the light rays in such a way that all of the rays spreading outward from one point on the transparency bend back together and merge to one point on the screen.
What is the projector used for?
A projector or image projector is an optical device
that projects an image (or moving images) onto a surface, commonly a projection screen
. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers.
What are the advantages and disadvantages of overhead projector?
- Transparencies.
- Heat and Noise.
- Bulky, Heavy Equipment.
- Projection Surface.
- Subject-Matter Limitations.
What is projector and its types?
There are two common types of projectors:
DLP (digital light processing), and LCD (liquid crystal display)
. In the early days of projectors, CRT (cathode ray tube) projectors were commonly used.
