Projectors

Projector️

Definition:

A projector or image projector is an optical device that projects an image 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 image directly, by using lasers.

History of projector

Francis Jenkins and Thomas Arman developed a motion picture projection device which they

called the Phonos open. It was publicly demonstrated in Atlanta in September 1895 at the Cotton States Exposition. Soon after, the two parted ways, with each claiming sole credit for the invention.

1879 CE, England: British photographer invents the first “movie” projector, which uses glass

slides of film that rotate quickly to give the impression of a moving picture. 1888 CE,

England: A French inventor patents a new type of movie projector, which combines a motion picture camera with a projector.

On April 21, 1895, Woodville Latham and his sons, Otway and Gray, demonstrate their

“Panoptic on,” the first movie projector developed in the United States.

French scientist Jacques Charles is thought to have invented the similar “mega scope” in

1780. He used it for his lectures. Around 1872 Henry Morton used an opaque projector in

demonstrations for huge audiences, for example in the Philadelphia Opera House which could seat 3500 people.

Types of Projectors

Currently, there are four kinds of projectors you can get for your home: DLP, LCD, LED, LCOS,

DLP Projector (Digital Light processing)

Digital Light Processing is a set of chipsets based on optical micro-electro-mechanical

technology that uses a digital micro mirror device. It was originally developed in 1987 by Larry

Hornbeck of Texas Instruments.

It was originally developed in 1987 by Larry Hornbeck of Texas Instruments. While the DLP

imaging device was invented by Texas Instruments, the first DLP-based projector was

introduced by Digital Projection Ltd in 1997.

1. LCD projector

An LCD projector is type of video projector for displaying video,

images or computer data on screen or another flat surface. İt is

modern equivalent of the slide projector or overhead projector.

2. LED projector

A projector or image projector is an optical device that projects an image

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.

3. Connections

The HDMI input is the most used connection of a

projector. With an HDMI connection you send digital

image and sound signals from a laptop, Blu-ray or

game computer to the projector. To save space, mini

beamers often have a micro-HDMI input. This means

that you need an HDMI to micro-HDMI cable.

4. LCOS Projector

Liquid crystal on silicon (Locos or LCOS) is a miniaturized reflective

active-matrix liquid-crystal display or “micro display” using a

liquid crystal layer on top of a silicon backplane. It is also referred

to as a spatial light modulator. Locos was initially developed for

projection televisions but is now used for wavelength selective

switching, structured illumination, near-eye displays and optical

pulse shaping. By way of comparison, some LCD projectors use Trans

missive LCD, allowing light to pass through the liquid crystal.