Information display system for displaying information such as pricing information on shelves containing retail merchandise

Claim 2

An electronic labelling system comprising: a computer, a transceiver connected to said computer, electronic tags preferably fixed to shelves, said transceiver transmitting, by means of electromagnetic waves, communications frames to update said tags and signals to synchronize said tags, said frames holding the specific address of a tag and the data to be displayed by that tag, each of said tags comprising a receiver which is periodically activated to receive the communications frames, said tags comprising devices for synchronizing said receivers to a transmission from said transceiver, said synchronizing devices comprising means for receiving a synchronization signal from said transceiver and means for synchronizing operation of said receivers with said transceiver, said synchronizing devices comprising means for transferring the synchronization signal received by said synchronization signal receiving means to said means for synchronizing operation of said receivers to synchronize said receivers with a communications frame transmitted from said transceiver, and said means for synchronizing operation of said receivers comprising means for activating the receivers with information from a previously received synchronization signal received from said transceiver at the time when a present communications frame is being transmitted from the transceiver.

Claim 3

A system as claimed in claim 1, wherein the computer transmits data for different tags in direct succession.

Claim 4

A system as claimed in claim 1, wherein said means for activating the receivers comprise an internal clock to activate the receivers.

Claim 5

A system as claimed in claim 2, wherein the internal clock is updated with information received from a previously received synchronization signal transmitted by the transceiver, said synchronization signal preceding, being contained in, or following the communications frames.

Claim 6

A system as claimed in claim 4, wherein said means for receiving a synchronization signal of an unsynchronized tag is periodically activated until it receives a synchronization signal from said transceiver, the activation period of said means for receiving a synchronization signal of an unsynchronized tag being selected to differ from the time elapsing between two synchronization signals transmitted by said transceiver.

Claim 7

A system as claimed in claim 3, wherein the computer transmits data for different tags in direct succession.

Claim 8

A system as claimed in claim 4, wherein the computer transmits data for different tags in direct succession.

Claim 9

A system as claimed in claim 5, wherein: the computer transmits data for different tags in direct succession; and said means for activating the receivers with information from a previously received synchronization signal comprises means for activating the receivers at the same instant in time when a present communications frame is being transmitted from the transceiver.

Claim 10

A system as claimed in claim 8, wherein said means for activating the receivers comprise means for turning the receivers off after they have received a preamble of a communications frame, and means for turning the receivers on again when data addressed to them is being transmitted from the transceiver.

Claim 11

A system as claimed in claim 9, wherein each tag is allocated a unique time window occurring subsequent to the transmission of data from the computer to the tags, in which time window the tag emits electromagnetic waves to the computer to confirm that it has received the data addressed to it.

Claim 12

A system as claimed in claim 10, wherein the tags are divided into logical groups, said means for activating the receivers comprises means for activating the receivers of each logical group at a different time.

Claim 13

A system as claimed in claim 11, wherein the tags are divided into logical groups independent of at least one of their position and the type of article they price mark.

Claim 14

A system as claimed in claim 12, wherein the transceiver transmits data to the tags in which one binary information item corresponds to one segment of the display elements of the tag.

Claim 15

A system as claimed in claim 13, wherein: the display elements are at least one of seven-segment displays, starburst displays, dot-matrix displays, liquid crystal displays and customized displays; the tags are powered from at least one of batteries, accumulators, and solar cells; data communication is by one of radio waves and infrared waves; and said seven-segment displays represent characters.

Claim 16

An information display system for displaying information on shelves containing merchandise, said system comprising: an information display arrangement; said information display arrangement comprising a plurality of information display devices; each of said plurality of information display devices being configured to be affixed to store shelves; said information display arrangement comprising a receiving arrangement to receive initial information and to update information displayed by said information display arrangement; said receiving arrangement comprising at least one receiving device to receive information from a source of information disposed a substantial distance from said information display arrangement; said receiving arrangement comprising a memory arrangement to store information to be displayed on said information display arrangement; each of said plurality of information display devices being configured to receive information stored in said memory arrangement; a transmitter to transmit information and signals to synchronize said receiving arrangement to be received by said at least one receiving device; said receiving arrangement comprising a synchronizing apparatus to synchronize said at least one receiving device to a transmission from said transmitter; said synchronizing apparatus comprising an activation device to activate said at least one receiving device at a determined time corresponding to a time when said transmitter is transmitting information; and said synchronizing apparatus comprising circuitry to change the determined time at which said activation device activates said at least one receiving device with information received from a previously received synchronization signal received from said transmitter.

Claim 17

An information display system for displaying information on shelves containing merchandise, said system comprising: an information display arrangement; said information display arrangement comprising a plurality of information display devices; each of said plurality of information display devices being configured to be affixed to store shelves; said information display arrangement comprising a receiving arrangement to receive initial information and to update information displayed by said information display arrangement; said receiving arrangement comprising at least one receiving device to receive information from a source of information disposed a substantial distance from said information display arrangement; said receiving arrangement comprising a memory arrangement to store information to be displayed on said information display arrangement; each of said plurality of information display devices being configured to receive information stored in said memory arrangement; a transmitter to transmit information and signals to synchronize said receiving arrangement to be received by said at least one receiving device; said receiving arrangement comprising a synchronizing apparatus to synchronize said at least one receiving device to a transmission from said transmitter; said synchronizing apparatus comprising an activation device to activate said at least one receiving device at a determined time corresponding to a time when said transmitter is transmitting information; and said synchronizing apparatus comprising circuitry to change the determined time at which said activation device activates said at least one receiving device with information received from a previously received synchronization signal received from said transmitter.

Claim 18

The information display system according to claim 15, wherein said synchronizing apparatus comprises an arrangement to synchronize said at least one receiving device with said transmitter to change the determined time at which said activation device activates said at least one receiving device.

Claim 19

The information display system according to claim 16, wherein: said at least one receiving device comprises a plurality of receiving devices; and said activation device comprises an arrangement to activate each of said plurality of receiving devices at a corresponding determined time.

Claim 22

The method of operating an information display system according to claim 18, wherein said step of synchronizing the receiving device comprises the further step of synchronizing the receiving device with said transmitter to change the determined time at which the activation device activates the receiving device.

Claim 23

The method of operating an information display system according to claim 19, wherein: said receiving device comprises a plurality of receivers; and said step of activating the receiving device comprises the further step of activating each of the plurality of receivers at a corresponding determined time.