Kent Display is best known for their Boogie Board writing tablet, which uses a proprietary screen tech developed by Kent Display. The idea behind the Boogie Board is that you can write, draw, or scribble on it with a stylus or your finger. The screen will hold the contents without using electricity. When you're done writing, you click the erase button and the screen is cleared (this part requires electricity). It's something like a high tech etch-a-sketch.
The first Boogie Board was launched in January 2010. Two models have just recently been released, and a 4th is scheduled this fall.