Patent ID: 6130603
Filing Date: 2000-10-10
Classification: G06F,G09G

Abstract:
An electronic price display system comprising a central computer and an RF transceiver communicatively coupled therewith, and further comprising a multiplicity of electronic price display labels each with a unique address, each electronic price display label comprising:a housing,a display within the housing,a power source within the housing,a controller within the housing and controlling the display and powered by the power source,a passive RF transceiver within the housing and not powered by the power source,an antenna communicatively coupled with the transceiver,the controller further characterized in having a clock speed switchable between a high speed and a low speed, the low speed selected to be sufficient to control the display, the controller comprising an interrupt input causing a switch to the high speed,the transceiver further characterized in having a register defined to contain the unique address of the label, and in having means responsive to received RF energy at the antenna for receiving an address modulated in the RF energy, for testing for a match between the unique address of the label and the received address, and for generating an interrupt output in the event of the match;the interrupt output of the transceiver operatively coupled with the interrupt input of the controller.