As video projectors become lower in price, schools have had to choose between a video projector vs. an overhead projector. Nearly every aspect of these types of projectors is different, but both use a light source to project enlarged images onto a projector screen. The light source is different between LED projectors, laser projectors, and lamp projectors. When it comes to finding the best projectors for schools and homes, we’ll have to consider the content available for both of these projection methods. To better understand digital devices, you may want to check out projector: native resolution vs. supported resolution.

KEY TAKEAWAYS:

  • Overhead projectors are used mainly in businesses and schools that have the transparencies and projector already.
  • Many video projectors have become common in businesses, schools, and homes.
  • Video projectors can be used with a variety of content, not just transparencies as overhead models can.

Differences Between Video and Overhead Projectors

The differences between video and overhead projectors vary from the type of content that can be shown to the method of projection. Additionally, the two may be used in different settings and with differing ambient light and brightness. When it comes to most of these differences, video projectors seem like the better choice, but overhead models have been used for years in education, making them worthwhile to schools and teachers who have their teaching already printed and organized on the overhead. Continue reading to find out more about these two projection technologies.

Insider Tip

Video projectors show images and videos that are hooked up to the device and changes can be made on this device while in use.

Available Content for Overhead and Video Projectors

The largest difference between video and overhead models stems from the type of content that can be displayed from either. Education facilities and businesses use overheads to show information from a transparent slide with printed or drawn content, including a text, photo, or slide. This particular type of device only works with these types of materials. Meanwhile, a video projector can show stationary pictures or videos to the watcher, as the name suggests. Thus, a video projector expands the content that can be shown, especially with the use of internet capabilities or document cameras.

Projection Methods for Overhead Projectors and Video Projectors

Overhead devices include a light source under the plate where the transparent paper sits. The light then shines up through the plate before hitting a mirror and bouncing off showing the projected picture on the desired wall or board. For video projection, the light source bounces off of a digital micromirror device or passes through a liquid crystal display (LCD) system. After being altered by color filters (for a digital light processing device) or the displays (for LCD projectors,) the image projects through the lens onto the projection screen. Several resolutions are possible using a video model, including WXGA resolution vs. full HD for a projector.

Insider Tip

Overhead projectors have become less common purchases, but schools that already have the desired slides still use them due to the ease of use and of cleaning.

Usage for Overhead and Digital Projectors

Overhead models may be used at businesses or in schools to demonstrate processes or provide information. The transparent pages can be written on using a dry erase marker that can be washed or erased at the end of the meeting or lesson. Digital versions can be used in the same settings or at home for entertainment. Although they do not offer the interactivity of markup using a whiteboard marker, they can be altered and adjusted on the computer or other source device. Additionally, digital projectors support larger images and sharp images.

Brightness and Contrast Ratios for Overhead and Digital Projectors

The brightness of both of these types of devices rests at an average of about 2,000 lumens of brightness. There are brighter images and outputs available for each, but digital projector technology is less affected by ambient light and does not waste light as an overhead model does. Additionally, the picture quality and contrast ratios typically remain better on a video projector due to the fact that they have more pixels overall, greater screen size, and brighter white levels when showing photos. Overhead models show photos with only the image quality available when printing.

Warning

Many games are not available in 4K, so you may want to stick with a cheaper 1080p option, which still features full HD.

F.A.Q.S

What is Adaptive Sync?

Adaptive sync changes the refresh rate of a display to match the output frames from the device as they are created.


What does “throw” mean?

Am projector’s throw describes the distance from a projector’s lens and the screen or wall or another surface where the image appears.


Do schools still use overhead projectors?

Some schools and businesses that already own overhead projectors and their desired content still use overhead projectors, but document cameras and regular projectors are becoming more common.



STAT: [Overhead projectors] were widely used in education and business before the advent of video projectors. (source)

Christen Costa

Grew up back East, got sick of the cold and headed West. Since I was small I have been pushing buttons - both electronic and human. With an insatiable need for tech I thought "why not start a blog focusing on technology, and use my dislikes and likes to post on gadgets."

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