Time slot communication system

1. A system ( 1 ), exhibiting

− a communication station ( 3 , 4 ) for communicating with a number of radio tags ( 7 - 14 ) in a time slot communication process, in which a number of time slots (Z 1 -ZN) per time slot cycle in a repeating sequence are available for communication, and each time slot (Z 1 -ZN) is characterized by a distinct time slot symbol (ZS 1 -ZSN), wherein the communication station is designed to send out a synchronization data signal (SD) exhibiting the time slot symbol (Z 1 -ZN) for the currently present time slot (Z 1 -ZN), and wherein

− a radio tag ( 7 - 14 ) is designed:

+ for changing from a sleep state (S) into an active state (E) at a wakeup instant (TA 1 ), and

+ for receiving the synchronization data signal (SD) in the active state (E) and,

+ if the received time slot symbol (ZS 1 -ZSN) indicates a time slot (Z 1 -ZN) intended for it, for defining a new wakeup instant (TA 2 ) corresponding to the next appearance of the time slot (Z 1 -ZN) intended for it in a time slot cycle that follows the currently present time slot cycle, wherein

− the radio tag ( 7 - 14 ) exhibits a display unit ( 27 ) for reproducing an image ( 32 ), wherein the image ( 32 ) is structured in image planes ( 28 , 30 ), and each image plane ( 28 , 30 ) is represented by image plane data (ED 1 , ED 2 ), wherein the radio tag ( 7 - 14 ) is designed to individually receive the image plane data (ED 1 , ED 2 ) and put together the image ( 32 ) by superposing the image planes ( 28 , 30 ), and wherein

− the communication station ( 3 , 4 ) is designed to transmit the respective image plane data (ED 1 , ED 2 ) during a time slot-overlapping communication with the radio tag ( 3 , 4 ).

2. The system ( 1 ) according to claim 1 , wherein

− the radio tag ( 3 , 4 ) is designed to change an existing image ( 32 ) by

+ receiving at least one single new image plane ( 28 , 30 ) of the image ( 32 ) and

+ generating the new appearance of the image ( 32 ) by replacing an already existing image plane ( 28 , 30 ) of the image ( 32 ) with the image plane ( 28 , 30 ) just received.

3. The system ( 1 ) according to claim 1 , wherein the radio tag ( 7 - 14 ) is designed to process images ( 32 ) in which the following meanings are ascribed to the image planes ( 28 , 30 ):

− first or second frequency ( 29 , 30 ) of changes in image contents, or

− first or second color of image contents, or

− first or second information category of image contents.

4. The system ( 1 ) according to claim 2 , wherein the radio tag ( 7 - 14 ) is designed to process images ( 32 ) in which the following meanings are ascribed to the image planes ( 28 , 30 ):

− first or second frequency ( 29 , 30 ) of changes in image contents, or

− first or second color of image contents, or

− first or second information category of image contents.

5. The system ( 1 ) according to claim 1 , wherein the system ( 1 ) realizes an electronic price display system, and a display unit ( 27 ) of the radio tag ( 7 - 14 ) serves to display product or price information, etc.

6. The system ( 1 ) according to claim 2 , wherein the system ( 1 ) realizes an electronic price display system, and a display unit ( 27 ) of the radio tag ( 7 - 14 ) serves to display product or price information, etc.

7. The system ( 1 ) according to claim 3 , wherein the system ( 1 ) realizes an electronic price display system, and a display unit ( 27 ) of the radio tag ( 7 - 14 ) serves to display product or price information, etc.

8. The system ( 1 ) according to claim 4 , wherein the system ( 1 ) realizes an electronic price display system, and a display unit ( 27 ) of the radio tag ( 7 - 14 ) serves to display product or price information, etc.