What are LED printers?
The options for a personal printer were largely regulated between inkjet printers and laser printers. As technology marches on, we now have a third option. You can read more about LED printers here, but this will give you a brief overview of the benefits and drawbacks of this technology.
These printers use the same basic method of printing and copying as a laser printer. However, they do it with no moving parts and a lack of lasers and mirrors. The method itself has been around since 1938 and is called electrophotography. Without getting into the minor details of the method, what happens is that a photoconductor is charged with static electricity in the shape of the image before it. Toner or ink then adheres to that charge and is then rolled onto paper. A fuser is used to heat the process so that the ink stays on the paper. The photoconductor is then cleaned and the process repeats. Lasers and LEDs are the methods in which the printer reads the image.
The largest difference between an LED printer and a laser printer is how the image is read. A laser printer will use a mirror array to read a line horizontal slice of the image from left to right, and then repeat the process till finished. An LED printer grabs an entire horizontal slice at once and does so with no array. The fact that an LED printer has no moving parts is a large benefit because it is one less situation where something can break and allows for a more compact design.
However, the biggest negative of an LED printer is that the resolution is fixed. The DPI can only be as large as the LED array, whereas a laser printer can adjust on the fly. This restriction may be resolved in future iterations, but for now it is the biggest drawback of the LED printer.