Element field-emission and process for its production.

field emission element, wherein the transmitter has portions projecting in rectangular on its distal end, capable of easily controlling the distance between the electrodes increases with lower micron in order to reduce the control voltage for which the device starts the field emission to the desired level and to improve the uniformity of the show. A transmitter (2), a collector (3) and a door (5) are arranged on a substrate (1), which is formed with a cavity (4) located near the electrodes (2, 3) other than the door (5). The latter is provided in the cavity (4).