Abstract: The present electrostatic display apparatus has its display panel constituted by many electrostatically operated display units arranged along the length and breadth forming a matrix. Each of the display units basically consists of a fixed and a movable electrodes, between which a high-tension voltage is supplied to bend the movable electrode by electrostatic force so as to cover the fixed electrode. With the fixed electrode covered or uncovered, each of the display units has its appearance changed, and serves as one of the dots constituting a pattern to be displayed and the present apparatus can display a static, a moving and a flowing pattern both in a positive image mode and in a negative image mode.

Abstract: A device for exchanging the display information to be given to an electrostatic display apparatus constituted with many electrostatic display units arranged to form a matrix. The present device comprises a RAM and a backup battery, both mounted on a base plate detachable from the main circuit of the device. This device makes it possible to partially change the display information data without interrupting the display in proceeding.