Projector
Projector
For other uses, see Projector (disambiguation).
Acer projector, 2012
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. A virtual retinal display, or retinal projector, is a projector that projects an image directly on the retina instead of using an external projection screen.
The most common type of projector used today is called a video projector. Video projectors are digital replacements for earlier types of projectors such as slide projectors and overhead projectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and early 2000s, but old analog projectors are still used at some places. The newest types of projectors are handheld projectors that use lasers or LEDs to project images. Their projections are hard to see if there is too much ambient light.
Movie theaters used a type of projector called a movie projector, nowadays mostly replaced with digital cinema video projectors.
Overview of Different Projector Types Edit
direct input Edit
Camera obscura
Concave mirror
Opaque projector
Overhead projector
Document camera
still images Edit
magic mirror
steganographic mirror (see below for details)
magic lantern
enlarger (not for direct viewing, but for the production of photographic prints)
slide projector
moving images Edit
trotting horse lamp (see below for details)
movie projector
video projector
handheld projector
virtual retinal display
For other uses, see Projector (disambiguation).
Acer projector, 2012
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. A virtual retinal display, or retinal projector, is a projector that projects an image directly on the retina instead of using an external projection screen.
The most common type of projector used today is called a video projector. Video projectors are digital replacements for earlier types of projectors such as slide projectors and overhead projectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and early 2000s, but old analog projectors are still used at some places. The newest types of projectors are handheld projectors that use lasers or LEDs to project images. Their projections are hard to see if there is too much ambient light.
Movie theaters used a type of projector called a movie projector, nowadays mostly replaced with digital cinema video projectors.
Overview of Different Projector Types Edit
direct input Edit
Camera obscura
Concave mirror
Opaque projector
Overhead projector
Document camera
still images Edit
magic mirror
steganographic mirror (see below for details)
magic lantern
enlarger (not for direct viewing, but for the production of photographic prints)
slide projector
moving images Edit
trotting horse lamp (see below for details)
movie projector
video projector
handheld projector
virtual retinal display
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