Patent ID: 6798389
Filing Date: 2004-09-28
Classification: G06Q,G09F

Abstract:
A battery free electronic tag installable along a shelf-edge rail of a product information display system which includes a conductor extending along the rail, the electronic tag comprising:a display screen for displaying product information; at least one annunciator separate from the display screen and selected from the group consisting of light emitting elements and sound emitting elements, for attracting the attention of customers when energized; a pick-up coil for inductively receiving a signal from a conductor when positioned in close proximity thereto; a power supply circuit connected to the pick-up coil for receiving the induced signal and energizing the annunciator with energy received from the induced signal; a control circuit; wherein the power supply circuit comprises a first capacitor, a second capacitor, and a first resistor, the first capacitor connected to be charged by energy from the induced signal; the control circuit connected to receive power from the power supply circuit; the second capacitor connected between the first capacitor and ground for being charged; the first resistor connected between the first capacitor and the second capacitor for affecting a charge rate of the second capacitor; and wherein the annunciator and a second resistor are connected in series to receive discharge energy from the second capacitor, the second resistor for affecting a discharge rate of the second capacitor through the annunciator.