There's a decent sized gap in this history, between transparencies or foils on top of an overhead projector and the modern era where laptops were connected to l

There's a decent sized gap in this history, between transparencies or foils on top of an overhead projector and the modern era where laptops were connected to long-throw video projectors. This middle period was filled by the creation of LCD panels that fit on top of an overhead projector and acted as a rudimentary video projector. The earliest ones were black and white and CGA only. I recall my dad using the early version of MS Paint to make images that he'd throw up on the screen with an Eastman Kodak LCD unit. Here's an example made by 3M: https://scientific-solutions.com/ebay/lcdpanel/lcdpanel.html https://scientific-solutions.com/ebay/lcdpanel/lcdpanel.html Later on, IBM actually had a specific model of ThinkPad, the 755CDV, that had a detachable backlight panel on the display. You would strap the entire laptop to an overhead projector to do your presentation. https://www.thinkwiki.org/wiki/Category:755CDV https://www.thinkwiki.org/wiki/Category:755CDV