Evolution Of Projectors 1895 - 2020

Here is a brief history on the evolution of projectors :

1. Opaque Projectors - One of the earliest forms of projection, the opaque projector, allows the user to project printed material or small objects without having to convert them to another medium.

In use for nearly sixty years, the opaque projector projects the object by shining a bright lamp on the material to be viewed and directing the reflected light through a projection lens. Documents, photos, magazines, books, and small 3-dimensional objects can be projected with the opaque projector provided the user remains mindful of the heat generated by the light source and the potential for damage to heat sensitive documents or objects.


▶️ Ad - I make not Less than $1.5k 💰 on YouTube Monthly with this - www.tubebuddy.com/Oralcomple


2. Slide Projectors - Slide projectors have also been around since the 1950's.

Unlike opaque projectors, slide projectors require that the presented material be transferred to a 35mm slide allowing the user to project virtually anything that can be can put on film. While there is a cost associated with creating slides, the benefit is the versatility of the device. Kodak, the leading supplier of slide projectors, discontinued production in October 2004.

3. Overhead Projectors - In some ways an overhead projector is very much like a slide projector in that the information to be viewed must be transferred to another medium, in this case a transparent sheet of flexible material known as a transparency. A transparency of any document can be easily generated with a copy machine. Once created, the transparency can be placed on an overhead projector and projected onto a wall or screen using a lamp and optics that are built into the projector. One of the benefits of the overhead projector is the ability to annotate the projected image while presenting. Overhead projectors are still widely used.

4. Digital Projection Panels - In the late 1980's overhead projectors found further use with the introduction of digital projection panels.

The digital projection panel consisted of a large LCD, electronics, cooling fan, and a plastic or metal enclosure with a glass plate on both sides of the LCD. The LCD was similar in size to that found in a notebook computer except that the electronics on the back of the LCD were unfolded to allow light from the overhead projector to pass through the LCD. A digital projection panel was essentially an electronic sheet of paper in a box about the size of a large book that when plugged into a computer could display the image using the light and optics of the overhead projector. It effectively became a giant monitor for the computer allowing fully interactive presentation, education, and training making them the first digital projectors.

Within a year of their introduction, video projector panels were introduced and were quickly followed by multimedia projector panels that could support video and data. Projection panels are still in use, but as prices drop and performance continues to improve, they are quickly being replaced by data projectors, video projectors and multimedia projectors.

5. Computer Projectors - the fully integrated digital data projector came into existence in the early 1990's and served primarily as a computer display projector for business, education and training.

It essentially combined the overhead projector and the digital projection panel into one device making it considerably smaller and more easily transported. As is true with most new technologies, the first offerings of the computer projector were big, heavy and expensive with image quality that pales in comparison to today's projectors. As the computer projectors got smaller, lighter, and cheaper they became popular with mobile presenters. Today data projectors are used in a wide range of applications including mobile presentations, conference rooms, classrooms, training, gaming, simulation, control rooms, museums, and retail advertising.

6. Video Projectors - The digital video projector also came into being in the early 1990's and like the early computer projectors, they were large, heavy and expensive.

They also suffered from poor image quality, high cost, and limited portability. But much has changed since the video projectors of the early 1990's arrived. Today you can buy a home theater projector and enjoy a high definition movie with quality that is comparable to or better than your local movie theater.

7. Pocket Projectors - The first pocket projectors were introduced in 2005 by Mitsubishi and they were small enough to fit in the palm of a hand.

Their light source is a cluster of LEDs and most of them can be plugged into a wall outlet or powered by battery. Their biggest drawback is the lumen output which in the first few years of shipment, was about 25 AN


▶️ Best Tool I use for this channel - www.tubebuddy.com/Oralcomple